release 0.36

- do not increase inspection level when activated with keyboard shortcut
- added some javadoc
- added to CHANGELOG.md and flatlaf-extras/README.md

.editorconfig

@@ -6,3 +6,231 @@ insert_final_newline = true
 charset = latin1
 indent_style = tab
 indent_size = 4
+
+[*.java]
+indent_style = tab
+ij_continuation_indent_size = 4
+ij_java_align_consecutive_assignments = false
+ij_java_align_consecutive_variable_declarations = false
+ij_java_align_group_field_declarations = false
+ij_java_align_multiline_annotation_parameters = false
+ij_java_align_multiline_array_initializer_expression = false
+ij_java_align_multiline_assignment = false
+ij_java_align_multiline_binary_operation = false
+ij_java_align_multiline_chained_methods = false
+ij_java_align_multiline_extends_list = false
+ij_java_align_multiline_for = true
+ij_java_align_multiline_method_parentheses = false
+ij_java_align_multiline_parameters = false
+ij_java_align_multiline_parameters_in_calls = false
+ij_java_align_multiline_parenthesized_expression = false
+ij_java_align_multiline_resources = false
+ij_java_align_multiline_ternary_operation = false
+ij_java_align_multiline_text_blocks = false
+ij_java_align_multiline_throws_list = false
+ij_java_align_subsequent_simple_methods = false
+ij_java_align_throws_keyword = false
+ij_java_annotation_parameter_wrap = off
+ij_java_array_initializer_new_line_after_left_brace = false
+ij_java_array_initializer_right_brace_on_new_line = false
+ij_java_array_initializer_wrap = normal
+ij_java_assert_statement_colon_on_next_line = false
+ij_java_assert_statement_wrap = off
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+ij_java_binary_operation_wrap = off
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+ij_java_blank_lines_around_field = 0
+ij_java_blank_lines_around_field_in_interface = 0
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+ij_java_blank_lines_around_method_in_interface = 1
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+ij_java_blank_lines_before_method_body = 0
+ij_java_blank_lines_before_package = 0
+ij_java_block_brace_style = next_line_if_wrapped
+ij_java_block_comment_at_first_column = true
+ij_java_call_parameters_new_line_after_left_paren = false
+ij_java_call_parameters_right_paren_on_new_line = false
+ij_java_call_parameters_wrap = normal
+ij_java_case_statement_on_separate_line = true
+ij_java_catch_on_new_line = false
+ij_java_class_annotation_wrap = split_into_lines
+ij_java_class_brace_style = next_line
+ij_java_class_count_to_use_import_on_demand = 99
+ij_java_class_names_in_javadoc = 1
+ij_java_do_not_indent_top_level_class_members = false
+ij_java_do_not_wrap_after_single_annotation = false
+ij_java_do_while_brace_force = never
+ij_java_doc_add_blank_line_after_description = true
+ij_java_doc_add_blank_line_after_param_comments = false
+ij_java_doc_add_blank_line_after_return = false
+ij_java_doc_add_p_tag_on_empty_lines = true
+ij_java_doc_align_exception_comments = true
+ij_java_doc_align_param_comments = true
+ij_java_doc_do_not_wrap_if_one_line = false
+ij_java_doc_enable_formatting = true
+ij_java_doc_enable_leading_asterisks = true
+ij_java_doc_indent_on_continuation = false
+ij_java_doc_keep_empty_lines = true
+ij_java_doc_keep_empty_parameter_tag = true
+ij_java_doc_keep_empty_return_tag = true
+ij_java_doc_keep_empty_throws_tag = true
+ij_java_doc_keep_invalid_tags = true
+ij_java_doc_param_description_on_new_line = false
+ij_java_doc_preserve_line_breaks = false
+ij_java_doc_use_throws_not_exception_tag = true
+ij_java_else_on_new_line = false
+ij_java_enum_constants_wrap = off
+ij_java_extends_keyword_wrap = split_into_lines
+ij_java_extends_list_wrap = normal
+ij_java_field_annotation_wrap = split_into_lines
+ij_java_finally_on_new_line = false
+ij_java_for_brace_force = never
+ij_java_for_statement_new_line_after_left_paren = false
+ij_java_for_statement_right_paren_on_new_line = false
+ij_java_for_statement_wrap = off
+ij_java_generate_final_locals = false
+ij_java_generate_final_parameters = false
+ij_java_if_brace_force = never
+ij_java_imports_layout = java.**,javax.**,*,$*
+ij_java_indent_case_from_switch = true
+ij_java_insert_inner_class_imports = false
+ij_java_insert_override_annotation = true
+ij_java_keep_blank_lines_before_right_brace = 1
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+ij_java_keep_first_column_comment = false
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+ij_java_keep_simple_methods_in_one_line = false
+ij_java_label_indent_absolute = false
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+ij_java_method_annotation_wrap = split_into_lines
+ij_java_method_brace_style = next_line_if_wrapped
+ij_java_method_call_chain_wrap = normal
+ij_java_method_parameters_new_line_after_left_paren = false
+ij_java_method_parameters_right_paren_on_new_line = false
+ij_java_method_parameters_wrap = normal
+ij_java_modifier_list_wrap = false
+ij_java_names_count_to_use_import_on_demand = 3
+ij_java_parameter_annotation_wrap = off
+ij_java_parentheses_expression_new_line_after_left_paren = false
+ij_java_parentheses_expression_right_paren_on_new_line = false
+ij_java_place_assignment_sign_on_next_line = false
+ij_java_prefer_longer_names = true
+ij_java_prefer_parameters_wrap = false
+ij_java_repeat_synchronized = true
+ij_java_replace_instanceof_and_cast = false
+ij_java_replace_null_check = true
+ij_java_replace_sum_lambda_with_method_ref = true
+ij_java_resource_list_new_line_after_left_paren = false
+ij_java_resource_list_right_paren_on_new_line = false
+ij_java_resource_list_wrap = normal
+ij_java_space_after_closing_angle_bracket_in_type_argument = false
+ij_java_space_after_colon = true
+ij_java_space_after_comma = true
+ij_java_space_after_comma_in_type_arguments = true
+ij_java_space_after_for_semicolon = true
+ij_java_space_after_quest = true
+ij_java_space_after_type_cast = true
+ij_java_space_before_annotation_array_initializer_left_brace = true
+ij_java_space_before_annotation_parameter_list = false
+ij_java_space_before_array_initializer_left_brace = true
+ij_java_space_before_catch_keyword = true
+ij_java_space_before_catch_left_brace = true
+ij_java_space_before_catch_parentheses = false
+ij_java_space_before_class_left_brace = true
+ij_java_space_before_colon = true
+ij_java_space_before_colon_in_foreach = true
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+ij_java_space_before_do_left_brace = true
+ij_java_space_before_else_keyword = true
+ij_java_space_before_else_left_brace = true
+ij_java_space_before_finally_keyword = true
+ij_java_space_before_finally_left_brace = true
+ij_java_space_before_for_left_brace = true
+ij_java_space_before_for_parentheses = false
+ij_java_space_before_for_semicolon = false
+ij_java_space_before_if_left_brace = true
+ij_java_space_before_if_parentheses = false
+ij_java_space_before_method_call_parentheses = false
+ij_java_space_before_method_left_brace = true
+ij_java_space_before_method_parentheses = false
+ij_java_space_before_opening_angle_bracket_in_type_parameter = false
+ij_java_space_before_quest = true
+ij_java_space_before_switch_left_brace = true
+ij_java_space_before_switch_parentheses = false
+ij_java_space_before_synchronized_left_brace = true
+ij_java_space_before_synchronized_parentheses = false
+ij_java_space_before_try_left_brace = true
+ij_java_space_before_try_parentheses = false
+ij_java_space_before_type_parameter_list = false
+ij_java_space_before_while_keyword = true
+ij_java_space_before_while_left_brace = true
+ij_java_space_before_while_parentheses = false
+ij_java_space_inside_one_line_enum_braces = false
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+ij_java_space_within_empty_method_parentheses = false
+ij_java_spaces_around_additive_operators = true
+ij_java_spaces_around_assignment_operators = true
+ij_java_spaces_around_bitwise_operators = true
+ij_java_spaces_around_equality_operators = true
+ij_java_spaces_around_lambda_arrow = true
+ij_java_spaces_around_logical_operators = true
+ij_java_spaces_around_method_ref_dbl_colon = false
+ij_java_spaces_around_multiplicative_operators = true
+ij_java_spaces_around_relational_operators = true
+ij_java_spaces_around_shift_operators = true
+ij_java_spaces_around_type_bounds_in_type_parameters = true
+ij_java_spaces_around_unary_operator = false
+ij_java_spaces_within_angle_brackets = false
+ij_java_spaces_within_annotation_parentheses = true
+ij_java_spaces_within_array_initializer_braces = true
+ij_java_spaces_within_braces = false
+ij_java_spaces_within_brackets = false
+ij_java_spaces_within_cast_parentheses = false
+ij_java_spaces_within_catch_parentheses = true
+ij_java_spaces_within_for_parentheses = true
+ij_java_spaces_within_if_parentheses = true
+ij_java_spaces_within_method_call_parentheses = true
+ij_java_spaces_within_method_parentheses = true
+ij_java_spaces_within_parentheses = false
+ij_java_spaces_within_switch_parentheses = true
+ij_java_spaces_within_synchronized_parentheses = true
+ij_java_spaces_within_try_parentheses = true
+ij_java_spaces_within_while_parentheses = true
+ij_java_special_else_if_treatment = true
+ij_java_subclass_name_suffix = Impl
+ij_java_ternary_operation_signs_on_next_line = true
+ij_java_ternary_operation_wrap = on_every_item
+ij_java_test_name_suffix = Test
+ij_java_throws_keyword_wrap = normal
+ij_java_throws_list_wrap = normal
+ij_java_use_external_annotations = false
+ij_java_use_fq_class_names = false
+ij_java_use_relative_indents = false
+ij_java_use_single_class_imports = true
+ij_java_variable_annotation_wrap = off
+ij_java_visibility = public
+ij_java_while_brace_force = never
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+ij_java_wrap_comments = false
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+ij_java_wrap_long_lines = false

.travis.yml

@@ -5,7 +5,7 @@ jdk:
   - openjdk8
   - openjdk9
   - openjdk11
-  - openjdk13
+  - openjdk14
 
 before_cache:
   - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
@@ -19,11 +19,21 @@ before_install:
   - ./gradlew --version
   - java -version
 
-deploy:
-  provider: script
-  script: ./gradlew bintrayUpload
-  skip_cleanup: true # to upload artifacts created during the build
-  on:
-    branch: master
-    jdk: openjdk11
-    tags: true
+stages:
+  - name: test
+  - name: snapshot
+    if: branch = master AND type IN (push) AND tag IS blank
+  - name: release
+    if: type IN (push) AND tag IS present
+
+jobs:
+  include:
+    # publish snapshot to oss.jfrog.org
+    - stage: snapshot
+      jdk: openjdk11
+      script: ./gradlew artifactoryPublish
+
+    # release a new stable version to bintray
+    - stage: release
+      jdk: openjdk11
+      script: ./gradlew bintrayUpload -Drelease=true

CHANGELOG.md

@@ -1,6 +1,341 @@
 FlatLaf Change Log
 ==================
 
+## 0.36
+
+- ScrollBar: Made styling more flexible by supporting insets and arc for track
+  and thumb. (issue #103)
+- ComboBox: Minimum width is now 72 pixels (was ~50 for non-editable and ~130
+  for editable comboboxes).
+- ComboBox: Support custom borders in combobox editors. (issue #102)
+- Button: Support non-square icon-only buttons. (issue #110)
+- Ubuntu Linux: Fixed poorly rendered font. (issue #105)
+- macOS Catalina: Use Helvetica Neue font.
+- `FlatInspector` added (see [FlatLaf Extras](flatlaf-extras)).
+
+
+## 0.35
+
+- Added drop shadows to popup menus, combobox popups, tooltips and internal
+  frames. (issue #94)
+- Support different component border colors to indicate errors, warnings or
+  custom state (set client property `JComponent.outline` to `error`, `warning`
+  or any `java.awt.Color`).
+- Button and ToggleButton: Support round button style (set client property
+  `JButton.buttonType` to `roundRect`).
+- ComboBox, Spinner and TextField: Support round border style (set client
+  property `JComponent.roundRect` to `true`).
+- Paint nicely rounded buttons, comboboxes, spinners and text fields when
+  setting `Button.arc`, `Component.arc` or `TextComponent.arc` to a large value
+  (e.g. 1000).
+- Added Java 9 module descriptor to `flatlaf-extras-<version>.jar` and
+  `flatlaf-swingx-<version>.jar`.
+- CheckBox and RadioButton: Flag `opaque` is no longer ignored when checkbox or
+  radio button is used as table cell renderer. (issue #77)
+- FileChooser: Use system icons. (issue #100)
+- FileChooser: Fixed missing labels in file chooser when running on Java 9 or
+  later. (issue #98)
+- PasswordField: Do not apply minimum width if `columns` property is greater
+  than zero.
+
+
+## 0.34
+
+- Menus: New menu item renderer brings stable left margins, right aligned
+  accelerators and larger gap between text and accelerator. This makes menus
+  look more modern and more similar to native platform menus.
+- New underline menu selection style that displays selected menu items similar
+  to tabs (to enable use `UIManager.put( "MenuItem.selectionType", "underline"
+  );`).
+- Menus: Fixed text color of selected menu items that use HTML. (issue #87)
+- Menus: On Windows, pressing <kbd>F10</kbd> now activates the menu bar without
+  showing a menu popup (as usual on Windows platform). On other platforms the
+  first menu popup is shown.
+- Menus: On Windows, releasing <kbd>Alt</kbd> key now activates the menu bar (as
+  usual on Windows platform). (issue #43)
+- Menus: Fixed inconsistent left padding in menu items. (issue #3)
+- Menus: Fixed: Setting `iconTextGap` property on a menu item did increase left
+  and right margins. (issue #54)
+- Hide mnemonics if window is deactivated (e.g. <kbd>Alt+Tab</kbd> to another
+  window). (issue #43)
+- macOS: Enabled drop shadows for popup menus and combobox popups. (issue #94)
+- macOS: Fixed NPE if using `JMenuBar` in `JInternalFrame` and macOS screen menu
+  bar is enabled (with `-Dapple.laf.useScreenMenuBar=true`). (issue #90)
+
+
+## 0.33
+
+- Improved creation of disabled grayscale icons used in disabled buttons, labels
+  and tabs. They now have more contrast and are lighter in light themes and
+  darker in dark themes. (issue #70)
+- IntelliJ Themes: Fixed ComboBox size and Spinner border in all Material UI
+  Lite themes and limit tree row height in all Material UI Lite themes and some
+  other themes.
+- IntelliJ Themes: Material UI Lite themes did not work when using
+  [IntelliJ Themes Pack](flatlaf-intellij-themes) addon. (PR #88, issue #89)
+- IntelliJ Themes: Added Java 9 module descriptor to
+  `flatlaf-intellij-themes-<version>.jar`.
+
+
+## 0.32
+
+- New [IntelliJ Themes Pack](flatlaf-intellij-themes) addon bundles many popular
+  open-source 3rd party themes from JetBrains Plugins Repository into a JAR and
+  provides Java classes to use them.
+- IntelliJ Themes: Fixed button and toggle button colors. (issue #86)
+- Updated IntelliJ Themes in demo to the latest versions.
+- ToggleButton: Compute selected background color based on current component
+  background. (issue #32)
+
+
+## 0.31
+
+- Focus indication border (or background) no longer hidden when temporary
+  loosing focus (e.g. showing a popup menu).
+- List, Table and Tree: Item selection color of focused components no longer
+  change from blue to gray when temporary loosing focus (e.g. showing a popup
+  menu).
+
+
+## 0.30
+
+- Windows: Fixed rendering of Unicode characters. Previously not all Unicode
+  characters were rendered on Windows. (issue #81)
+
+
+## 0.29
+
+- Linux: Fixed scaling if `GDK_SCALE` environment variable is set or if running
+  on JetBrains Runtime. (issue #69)
+- Tree: Fixed repainting wide selection on focus gained/lost.
+- ComboBox: No longer ignore `JComboBox.prototypeDisplayValue` when computing
+  popup width. (issue #80)
+- Support changing default font used for all components with automatic scaling
+  UI if using larger font. Use `UIManager.put( "defaultFont", myFont );`
+- No longer use system property `sun.java2d.uiScale`. (Java 8 only)
+- Support specifying custom scale factor in system property `flatlaf.uiScale`
+  also for Java 9 and later.
+- Demo: Support using own FlatLaf themes (`.properties` files) that are located
+  in working directory of Demo application. Shown in the "Themes" list under
+  category "Current Directory".
+
+
+## 0.28
+
+- PasswordField: Warn about enabled Caps Lock.
+- TabbedPane: Support <kbd>Ctrl+TAB</kbd> / <kbd>Ctrl+Shift+TAB</kbd> to switch
+  to next / previous tab.
+- TextField, FormattedTextField and PasswordField: Support round borders (see UI
+  default value `TextComponent.arc`). (issue #65)
+- IntelliJ Themes: Added Gradianto themes to demo.
+- Button, CheckBox and RadioButton: Fixed NPE when button has children. (PR #68)
+- ScrollBar: Improved colors.
+- Reviewed (and tested) all key bindings on Windows and macOS. Linux key
+  bindings are equal to Windows key bindings. macOS key bindings are slightly
+  different for platform specific behavior.
+- UI default values are no longer based on Metal/Aqua UI defaults.
+
+
+## 0.27
+
+- Support `JInternalFrame` and `JDesktopPane`. (issues #39 and #11)
+- Table: Support positioning the column sort arrow in header right, left, top or
+  bottom. (issue #34)
+- ProgressBar: Fixed visual artifacts in indeterminate mode, on HiDPI screens at
+  125%, 150% and 175% scaling, when the progress moves around.
+- TabbedPane: New option to allow tab separators to take full height (to enable
+  use `UIManager.put( "TabbedPane.tabSeparatorsFullHeight", true );`). (issue
+  #59, PR #62)
+- CheckBox and RadioButton: Do not fill background if `contentAreaFilled` is
+  `false`. (issue #58, PR #63)
+- ToggleButton: Make toggle button square if it has an icon but no text or text
+  is "..." or a single character.
+- ToolBar: No longer use special rollover border for buttons in toolbar. (issue
+  #36)
+- ToolBar: Added empty space around buttons in toolbar and toolbar itself (see
+  UI default values `Button.toolbar.spacingInsets` and `ToolBar.borderMargins`).
+  (issue #56)
+- Fixed "illegal reflective access operation" warning on macOS when using Java
+  12 or later. (issue #60, PR #61)
+
+
+## 0.26
+
+- Menus:
+  - Changed menu bar and popup menu background colors (made brighter in light
+    themes and darker in dark themes).
+  - Highlight items in menu bar on mouse hover. (issue #49)
+  - Popup menus now have empty space at the top and bottom.
+  - Menu items now have larger left and right margins.
+  - Made `JMenu`, `JMenuItem`, `JCheckBoxMenuItem` and `JRadioButtonMenuItem`
+    non-opaque.
+- TextField, FormattedTextField and PasswordField: Select all text when a text
+  field gains focus for the first time and selection was not set explicitly.
+  This can be configured to newer or always select all text on focus gain (see
+  UI default value `TextComponent.selectAllOnFocusPolicy`).
+- ProgressBar: Made progress bar paint smooth in indeterminate mode.
+
+
+## 0.25.1
+
+Re-release of 0.25 because of problems with Maven Central.
+
+
+## 0.25
+
+- Hide menu mnemonics by default and show them only when <kbd>Alt</kbd> key is
+  pressed. (issue #43)
+- Menu: Fixed vertical alignment of sub-menus. (issue #42)
+- TabbedPane: In scroll-tab-layout, the cropped line is now hidden. (issue #40)
+- Tree: UI default value `Tree.textBackground` now has a valid color and is no
+  longer `null`.
+- Tree on macOS: Fixed <kbd>Left</kbd> and <kbd>Right</kbd> keys to collapse or
+  expand nodes.
+- ComboBox on macOS: Fixed keyboard navigation and show/hide popup.
+- Button and ToggleButton: Support per component minimum height (set client
+  property `JComponent.minimumHeight` to an integer). (issue #44)
+- Button and ToggleButton: Do not apply minimum width if button border was
+  changed (is no longer an instance of `FlatButtonBorder`).
+- ToggleButton: Renamed toggle button type "underline" to "tab" (value of client
+  property `JButton.buttonType` is now `tab`).
+- ToggleButton: Support per component styling for tab-style toggle buttons with
+  client properties `JToggleButton.tab.underlineHeight` (integer),
+  `JToggleButton.tab.underlineColor` (Color) and
+  `JToggleButton.tab.selectedBackground` (Color). (issue #45)
+- ToggleButton: No longer use focus width for tab-style toggle buttons to
+  compute component size, which reduces/fixes component size in "Flat IntelliJ"
+  and "Flat Darcula" themes.
+- TabbedPane: Support per component tab height (set client property
+  `JTabbedPane.tabHeight` to an integer).
+- ProgressBar: Support square painting (set client property
+  `JProgressBar.square` to `true`) and larger height even if no string is
+  painted (set client property `JProgressBar.largeHeight` to `true`).
+
+
+## 0.24
+
+- Support smooth scrolling with touchpads and high precision mouse wheels.
+  (issue #27)
+- Changed `.properties` file loading order: Now all core `.properties` files are
+  loaded before loading addon `.properties` files. This makes it easier to
+  overwrite core values in addons. Also, addon loading order can be specified.
+- TableHeader: Paint column borders if renderer has changed, but delegates to
+  the system default renderer (e.g. done in NetBeans).
+- Label and ToolTip: Fixed font sizes for HTML headings.
+- Button and ToggleButton: Support square button style (set client property
+  `JButton.buttonType` to `square`).
+- ToggleButton: Support underline toggle button style (set client property
+  `JButton.buttonType` to `underline`).
+- Button and TextComponent: Support per component minimum width (set client
+  property `JComponent.minimumWidth` to an integer).
+- ScrollPane with Table: The border of buttons that are added to one of the four
+  scroll pane corners are now removed if the center component is a table. Also,
+  these corner buttons are made not focusable.
+- Table: Replaced `Table.showGrid` with `Table.showHorizontalLines` and
+  `Table.showVerticalLines`. (issue #38)
+- ProgressBar: Now uses blueish color for the progress part in "Flat Dark"
+  theme. In the "Flat Darcula" theme, it remains light gray.
+- Improved Swing system colors `controlHighlight`, `controlLtHighlight`,
+  `controlShadow` and `controlDkShadow`.
+
+
+## 0.23.1
+
+- Tree: Fixed wide selection if scrolled horizontally.
+- ComboBox: Fixed NPE in Oracle SQL Developer settings.
+- IntelliJ Themes: Fixed checkbox colors in Material UI Lite dark themes.
+
+
+## 0.23
+
+- Updated colors in "Flat Light" and "Flat IntelliJ" themes with colors from
+  "IntelliJ Light Theme", which provides blue coloring that better matches
+  platform colors.
+- Tree: Support wide selection (enabled by default).
+- Table: Hide grid and changed intercell spacing to zero.
+- List, Table and Tree: Added colors for drag-and-drop. Added "enable drag and
+  drop" checkbox to Demo on "Data Components" tab.
+- List and Tree: Hide cell focus indicator (black rectangle) by default. Can be
+  enabled with `List.showCellFocusIndicator=true` /
+  `Tree.showCellFocusIndicator=true`, but then the cell focus indicator is shown
+  only if more than one item is selected.
+- Table: Hide cell focus indicator (black rectangle) by default if none of the
+  selected cells is editable. Can be show always with
+  `Table.showCellFocusIndicator=true`.
+- Support basic color functions in `.properties` files: `rgb(red,green,blue)`,
+  `rgba(red,green,blue,alpha)`, `hsl(hue,saturation,lightness)`,
+  `hsla(hue,saturation,lightness,alpha)`, `lighten(color,amount[,options])` and
+  `darken(color,amount[,options])`.
+- Replaced prefix `@@` with `$` in `.properties` files.
+- Fixed link color (in HTML text) and separator color in IntelliJ platform
+  themes.
+- Use logging instead of printing errors to `System.err`.
+- Updated IntelliJ Themes in demo to the latest versions.
+- IntelliJ Themes: Fixed link and separator colors.
+
+
+## 0.22
+
+- TextComponent: Support placeholder text that is displayed if text field is
+  empty (set client property "JTextField.placeholderText" to a string).
+- TextComponent: Scale caret width on HiDPI screens when running on Java 8.
+- ProgressBar: If progress text is visible:
+  - use smaller font
+  - reduced height
+  - changed style to rounded rectangle
+  - fixed painting issues on low values
+- ProgressBar: Support configure of arc with `ProgressBar.arc`.
+- ProgressBar: Reduced thickness from 6 to 4.
+- TabbedPane: Support background color for selected tabs
+  (`TabbedPane.selectedBackground`) and separators between tabs
+  (`TabbedPane.showTabSeparators`).
+- CheckBox: changed `CheckBox.arc` from radius to diameter to be consistent with
+  `Button.arc` and `Component.arc`
+- Button: Enabled `Button.defaultButtonFollowsFocus` on Windows, which allows
+  pressing focused button with <kbd>Enter</kbd> key (as in Windows LaF).
+- Fixed clipped borders at 125%, 150% and 175% scaling when outer focus width is
+  zero (default in "Flat Light" and "Flat Dark" themes).
+- On Mac show mnemonics only when <kbd>Ctrl</kbd> and <kbd>Alt</kbd> keys are
+  pressed. (issue #4)
+
+
+## 0.21
+
+- ScrollBar: Show decrease/increase arrow buttons if client property
+  "JScrollBar.showButtons" is set to `true` on `JScrollPane` or `JScrollBar`.
+  (issue #25)
+- `FlatLaf.isNativeLookAndFeel()` now returns `false`.
+- Button: Optionally support gradient borders, gradient backgrounds and shadows
+  for improved compatibility with IntelliJ platform themes (e.g. for Vuesion,
+  Spacegray and Material Design Dark themes).
+- Button: Fixed help button styling in IntelliJ platform themes.
+- ScrollPane: Paint disabled border if view component (e.g. JTextPane) is
+  disabled.
+- Fixed Swing system colors in dark themes.
+
+
+## 0.20
+
+- Support using IntelliJ platform themes (.theme.json files).
+- Support `JFileChooser`. (issue #5)
+- Look and feel identifier returned by `FlatLaf.getID()` now always starts with
+  "FlatLaf". Use `UIManager.getLookAndFeel().getID().startsWith( "FlatLaf" )` to
+  check whether the current look and feel is FlatLaf.
+- Fixed selection background of checkbox in table cell.
+- Fixed color of links in HTML text.
+- Fixed jittery submenu rendering on Mac. (issue #10)
+- Fixed "cannot find symbol" error in NetBeans editor, when source/binary format
+  is set to JDK 9 (or later) in NetBeans project. (issue #13)
+- Button: Make button square if button text is "..." or a single character.
+- ComboBox: Fixed issues with NetBeans `org.openide.awt.ColorComboBox`
+  component.
+- Hex color values in `.properties` files now must start with a `#` character.
+- SwingX: Support `JXTitledPanel`. (issue #22)
+- SwingX: Fixed too wide border when using date picker as table cell editor.
+  (issue #24)
+- JIDE Common Layer: Fixed `JidePopup` border.
+
+
 ## 0.18
 
 - TextField and TextArea: Do not apply minimum width if `columns` property is

README.md

@@ -16,6 +16,17 @@ IntelliJ IDEA 2019.2+ and uses almost the same colors and icons.
 ![Flat Dark Demo](images/FlatDarkDemo.png)
 
 
+IntelliJ Platform Themes
+------------------------
+
+FlatLaf can use 3rd party themes created for IntelliJ Platform (see
+[IntelliJ Themes Pack](flatlaf-intellij-themes)):
+
+![Cyan Light Demo](images/CyanLightDemo.png)
+
+![Dark Purple Demo](images/DarkPurpleDemo.png)
+
+
 Demo
 ----
 
@@ -35,18 +46,68 @@ build script:
 
     groupId:     com.formdev
     artifactId:  flatlaf
-    version:     0.18
+    version:     (see button below)
 
 Otherwise download `flatlaf-<version>.jar` here:
 
 [![Download](https://api.bintray.com/packages/jformdesigner/flatlaf/flatlaf/images/download.svg)](https://bintray.com/jformdesigner/flatlaf/flatlaf/_latestVersion)
 
 
+### Snapshots
+
+FlatLaf snapshot binaries are available in
+[JFrog Artifactory](https://oss.jfrog.org/artifactory/oss-snapshot-local/com/formdev/).
+To access the latest snapshot, change the FlatLaf version(s) in the dependencies
+to `<version>-SNAPSHOT` (e.g. `0.27-SNAPSHOT`) and add the repository
+`https://oss.jfrog.org/artifactory/oss-snapshot-local` to your build (see
+[Maven](https://maven.apache.org/guides/mini/guide-multiple-repositories.html)
+and
+[Gradle](https://docs.gradle.org/current/userguide/declaring_repositories.html#sec:declaring_custom_repository)
+docs).
+
+
 Addons
 ------
 
+- [IntelliJ Themes Pack](flatlaf-intellij-themes)
+- [Extras](flatlaf-extras)
 - [SwingX](flatlaf-swingx)
-- [JIDE Common Layer](https://github.com/jidesoft/jide-oss)
+- [JIDE Common Layer](flatlaf-jide-oss)
+
+
+Projects using FlatLaf
+----------------------
+
+- [NetBeans](https://netbeans.apache.org/) 11.3
+- [jclasslib bytecode viewer](https://github.com/ingokegel/jclasslib) 5.5
+- [KeyStore Explorer](https://keystore-explorer.org/) 5.4.3
+- [OWASP Zed Attack Proxy (ZAP)](https://www.zaproxy.org/) (in weekly releases)
+- [XMLmind XML Editor](https://www.xmlmind.com/xmleditor/) 9.3 (commercial)
+- [Total Validator](https://www.totalvalidator.com/) 15 (commercial)
+- [j-lawyer](https://github.com/jlawyerorg/j-lawyer-org)
+- [MegaMek](https://github.com/MegaMek/megamek) v0.47.4 and
+  [MekHQ](https://github.com/MegaMek/mekhq) v0.47.5
+- [GUIslice Builder](https://github.com/ImpulseAdventure/GUIslice-Builder)
+  0.13.b024
+- [Rest Suite](https://github.com/supanadit/restsuite)
+- [ControllerBuddy](https://github.com/bwRavencl/ControllerBuddy)
+- [SpringRemote](https://github.com/HaleyWang/SpringRemote)
+- [mendelson AS2](https://sourceforge.net/projects/mec-as2/),
+  [AS4](https://sourceforge.net/projects/mendelson-as4/) and
+  [OFTP2](https://sourceforge.net/projects/mendelson-oftp2/) (open-source) and
+  [mendelson AS2](https://mendelson-e-c.com/as2/),
+  [AS4](https://mendelson-e-c.com/as4/) and
+  [OFTP2](https://mendelson-e-c.com/oftp2) (commercial)
+- [MeteoInfo](https://github.com/meteoinfo/MeteoInfo) 2.1.6
+- [lsfusion platform](https://github.com/lsfusion/platform)
+- and more...
+
+
+Buzz
+----
+
+- [What others say about FlatLaf on Twitter](https://twitter.com/search?f=live&q=flatlaf)
+- [FlatLaf announcement on Reddit](https://www.reddit.com/r/java/comments/dl0hu3/flatlaf_flat_look_and_feel/)
 
 
 Documentation

build.gradle.kts

@@ -5,7 +5,7 @@
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
- *     http://www.apache.org/licenses/LICENSE-2.0
+ *     https://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
@@ -14,9 +14,14 @@
  * limitations under the License.
  */
 
-version = "0.18"
+val releaseVersion = "0.36"
+val developmentVersion = "0.37-SNAPSHOT"
+
+version = if( java.lang.Boolean.getBoolean( "release" ) ) releaseVersion else developmentVersion
 
 allprojects {
+	version = rootProject.version
+
 	repositories {
 		jcenter()
 	}
@@ -33,3 +38,39 @@ println( "FlatLaf Version: ${version}" )
 println( "Gradle ${gradle.gradleVersion} at ${gradle.gradleHomeDir}" )
 println( "Java ${System.getProperty( "java.version" )}" )
 println()
+
+
+extra["bintray.user"] = System.getenv( "BINTRAY_USER" ) ?: System.getProperty( "bintray.user" )
+extra["bintray.key"]  = System.getenv( "BINTRAY_KEY" )  ?: System.getProperty( "bintray.key" )
+
+// if true, do not upload to bintray
+extra["bintray.dryRun"] = false
+
+// if true, uploaded artifacts are visible to all
+// if false, only visible to owner when logged into bintray
+extra["bintray.publish"] = true
+
+
+allprojects {
+	tasks {
+		withType<JavaCompile>().configureEach {
+			sourceCompatibility = "1.8"
+			targetCompatibility = "1.8"
+
+			options.encoding = "ISO-8859-1"
+		}
+
+		withType<Jar>().configureEach {
+			// manifest for all created JARs
+			manifest.attributes(mapOf(
+				"Implementation-Vendor" to "FormDev Software GmbH",
+				"Implementation-Copyright" to "Copyright (C) ${java.time.LocalDate.now().year} FormDev Software GmbH. All rights reserved.",
+				"Implementation-Version" to project.version))
+
+			// add META-INF/LICENSE to all created JARs
+			from("${rootDir}/LICENSE") {
+				into("META-INF")
+			}
+		}
+	}
+}

buildSrc/build.gradle.kts

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2020 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+plugins {
+	`kotlin-dsl`
+}
+
+// required for kotlin-dsl or embedded-kotlin plugins
+repositories {
+	jcenter()
+}
+
+dependencies {
+	// NOTE: keep plugin versions in sync with settings.gradle.kts
+
+	// "com.jfrog.bintray" plugin
+	implementation( "com.jfrog.bintray.gradle:gradle-bintray-plugin:1.8.4" )
+
+	// "com.jfrog.artifactory" plugin
+	implementation( "org.jfrog.buildinfo:build-info-extractor-gradle:4.13.0" )
+}

buildSrc/src/main/java/ReorderJarEntries.java

@@ -0,0 +1,80 @@
+/*
+ * Copyright 2020 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.file.Files;
+import java.nio.file.StandardOpenOption;
+import java.util.function.Predicate;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipInputStream;
+import java.util.zip.ZipOutputStream;
+
+/**
+ * Reorders entries in a JAR file so that .properties files are placed before .class files,
+ * which is necessary to workaround an issue in NetBeans 11.3 (and older).
+ * See issues #13 and #93.
+ *
+ * @author Karl Tauber
+ */
+public class ReorderJarEntries
+{
+	public static void reorderJarEntries( File jarFile )
+		throws IOException
+	{
+		ByteArrayOutputStream outStream = new ByteArrayOutputStream( (int) jarFile.length() + 1000 );
+
+		try( ZipOutputStream zipOutStream = new ZipOutputStream( outStream ) ) {
+			// 1st pass: copy .properties files
+			copyFiles( zipOutStream, jarFile, name -> name.endsWith( ".properties" ) );
+
+			// 2st pass: copy other files
+			copyFiles( zipOutStream, jarFile, name -> !name.endsWith( ".properties" ) );
+		}
+
+		// replace JAR
+		Files.write( jarFile.toPath(), outStream.toByteArray(),
+			StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING );
+	}
+
+	private static void copyFiles( ZipOutputStream dest, File jarFile, Predicate<String> filter )
+		throws IOException
+	{
+		try( ZipInputStream zipInputStream = new ZipInputStream( new FileInputStream( jarFile ) ) ) {
+			ZipEntry entry;
+			while( (entry = zipInputStream.getNextEntry()) != null ) {
+				if( filter.test( entry.getName() ) ) {
+					dest.putNextEntry( entry );
+					copyFile( zipInputStream, dest );
+				}
+			}
+		}
+	}
+
+	private static void copyFile( InputStream src, OutputStream dest )
+		throws IOException
+	{
+		byte[] buf = new byte[8*1024];
+		int len;
+		while( (len = src.read( buf )) > 0 )
+			dest.write( buf, 0, len );
+		dest.flush();
+	}
+}

buildSrc/src/main/kotlin/flatlaf-java9.gradle.kts

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2020 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+plugins {
+	java
+}
+
+if( JavaVersion.current() >= JavaVersion.VERSION_1_9 ) {
+	sourceSets {
+		create( "java9" ) {
+			java {
+				setSrcDirs( listOf( "src/main/java9" ) )
+			}
+		}
+	}
+
+	tasks {
+		named<JavaCompile>( "compileJava9Java" ) {
+			sourceCompatibility = "9"
+			targetCompatibility = "9"
+		}
+
+		jar {
+			manifest.attributes( "Multi-Release" to "true" )
+
+			into( "META-INF/versions/9" ) {
+				from( sourceSets["java9"].output )
+			}
+		}
+	}
+}

buildSrc/src/main/kotlin/flatlaf-module-info.gradle.kts

@@ -0,0 +1,64 @@
+/*
+ * Copyright 2020 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+open class ModuleInfoExtension {
+	var paths: ArrayList<String> = ArrayList()
+
+	fun dependsOn( vararg paths: String ) {
+		this.paths.addAll( paths )
+	}
+}
+
+val extension = project.extensions.create<ModuleInfoExtension>( "flatlafModuleInfo" )
+
+
+plugins {
+	java
+}
+
+if( JavaVersion.current() >= JavaVersion.VERSION_1_9 ) {
+	sourceSets {
+		create( "module-info" ) {
+			java {
+				// include "src/main/java" here to get compile errors if classes are
+				// used from other modules that are not specified in module dependencies
+				setSrcDirs( listOf( "src/main/module-info", "src/main/java" ) )
+			}
+		}
+	}
+
+	tasks {
+		named<JavaCompile>( "compileModuleInfoJava" ) {
+			sourceCompatibility = "9"
+			targetCompatibility = "9"
+
+			dependsOn( extension.paths )
+
+			options.compilerArgs.add( "--module-path" )
+			options.compilerArgs.add( configurations.runtimeClasspath.get().asPath )
+		}
+
+		jar {
+			manifest.attributes( "Multi-Release" to "true" )
+
+			into( "META-INF/versions/9" ) {
+				from( sourceSets["module-info"].output ) {
+					include( "module-info.class" )
+				}
+			}
+		}
+	}
+}

buildSrc/src/main/kotlin/flatlaf-publish.gradle.kts

@@ -0,0 +1,116 @@
+/*
+ * Copyright 2020 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+open class PublishExtension {
+	var artifactId: String? = null
+	var name: String? = null
+	var description: String? = null
+}
+
+val extension = project.extensions.create<PublishExtension>( "flatlafPublish" )
+
+
+plugins {
+	`maven-publish`
+	id( "com.jfrog.bintray" )
+	id( "com.jfrog.artifactory" )
+}
+
+publishing {
+	publications {
+		create<MavenPublication>( "maven" ) {
+			afterEvaluate {
+				artifactId = extension.artifactId
+			}
+			groupId = "com.formdev"
+
+			from( components["java"] )
+
+			pom {
+				afterEvaluate {
+					this@pom.name.set( extension.name )
+					this@pom.description.set( extension.description )
+				}
+				url.set( "https://github.com/JFormDesigner/FlatLaf" )
+
+				licenses {
+					license {
+						name.set( "The Apache License, Version 2.0" )
+						url.set( "https://www.apache.org/licenses/LICENSE-2.0.txt" )
+					}
+				}
+
+				developers {
+					developer {
+						name.set( "Karl Tauber" )
+						organization.set( "FormDev Software GmbH" )
+						organizationUrl.set( "https://www.formdev.com/" )
+					}
+				}
+
+				scm {
+					url.set( "https://github.com/JFormDesigner/FlatLaf" )
+				}
+			}
+		}
+	}
+}
+
+bintray {
+	user = rootProject.extra["bintray.user"] as String?
+	key = rootProject.extra["bintray.key"] as String?
+
+	setPublications( "maven" )
+
+	with( pkg ) {
+		repo = "flatlaf"
+		afterEvaluate {
+			this@with.name = extension.artifactId
+		}
+		setLicenses( "Apache-2.0" )
+		vcsUrl = "https://github.com/JFormDesigner/FlatLaf"
+
+		with( version ) {
+			name = project.version.toString()
+		}
+
+		publish = rootProject.extra["bintray.publish"] as Boolean
+		dryRun = rootProject.extra["bintray.dryRun"] as Boolean
+	}
+}
+
+artifactory {
+	setContextUrl( "https://oss.jfrog.org" )
+
+	publish( closureOf<org.jfrog.gradle.plugin.artifactory.dsl.PublisherConfig> {
+		repository( delegateClosureOf<groovy.lang.GroovyObject> {
+			setProperty( "repoKey", "oss-snapshot-local" )
+			setProperty( "username", rootProject.extra["bintray.user"] as String? )
+			setProperty( "password", rootProject.extra["bintray.key"] as String? )
+		} )
+
+		defaults( delegateClosureOf<groovy.lang.GroovyObject> {
+			invokeMethod( "publications", "maven" )
+			setProperty( "publishArtifacts", true )
+			setProperty( "publishPom", true )
+		} )
+	} )
+
+	resolve( delegateClosureOf<org.jfrog.gradle.plugin.artifactory.dsl.ResolverConfig> {
+		setProperty( "repoKey", "jcenter" )
+	} )
+}

flatlaf-core/README.md

@@ -0,0 +1,4 @@
+FlatLaf Core
+============
+
+This sub-project contains the FlatLaf core source code.

flatlaf-core/build.gradle.kts

@@ -5,7 +5,7 @@
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
- *     http://www.apache.org/licenses/LICENSE-2.0
+ *     https://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
@@ -14,139 +14,48 @@
  * limitations under the License.
  */
 
-version = rootProject.version
-
 plugins {
 	`java-library`
-	`maven-publish`
-	id( "com.jfrog.bintray" ) version "1.8.4"
-}
-
-if( JavaVersion.current() >= JavaVersion.VERSION_1_9 ) {
-	sourceSets {
-		create( "module-info" ) {
-			java {
-				// include "src/main/java" here to get compile errors if classes are
-				// used from other modules that are not specified in module dependencies
-				setSrcDirs( listOf( "src/main/module-info", "src/main/java" ) )
-			}
-		}
-	}
+	`flatlaf-module-info`
+	`flatlaf-java9`
+	`flatlaf-publish`
 }
 
 java {
-    sourceCompatibility = JavaVersion.VERSION_1_8
-    targetCompatibility = JavaVersion.VERSION_1_8
+	withSourcesJar()
+	withJavadocJar()
 }
 
 tasks {
-	assemble {
-		dependsOn(
-			"sourcesJar",
-			"javadocJar"
-		)
-	}
-
-	if( JavaVersion.current() >= JavaVersion.VERSION_1_9 ) {
-		named<JavaCompile>( "compileModuleInfoJava" ) {
-			sourceCompatibility = "9"
-			targetCompatibility = "9"
-		}
-	}
-	
 	jar {
 		archiveBaseName.set( "flatlaf" )
 
-		if( JavaVersion.current() >= JavaVersion.VERSION_1_9 ) {
-			manifest.attributes(
-				"Multi-Release" to "true"
-			)
-
-			into( "META-INF/versions/9" ) {
-				from( sourceSets["module-info"].output )
-				include( "module-info.class" )
-			}
+		doLast {
+			ReorderJarEntries.reorderJarEntries( outputs.files.singleFile );
 		}
 	}
 
 	javadoc {
 		options {
 			this as StandardJavadocDocletOptions
+			use( true )
 			tags = listOf( "uiDefault", "clientProperty" )
+			addStringOption( "Xdoclint:all,-missing", "-Xdoclint:all,-missing" )
 		}
 		isFailOnError = false
 	}
 
-	register( "sourcesJar", Jar::class ) {
+	named<Jar>("sourcesJar" ) {
 		archiveBaseName.set( "flatlaf" )
-		archiveClassifier.set( "sources" )
-
-		from( sourceSets.main.get().allJava )
 	}
 
-	register( "javadocJar", Jar::class ) {
+	named<Jar>("javadocJar" ) {
 		archiveBaseName.set( "flatlaf" )
-		archiveClassifier.set( "javadoc" )
-
-		from( javadoc )
 	}
 }
 
-publishing {
-	publications {
-		create<MavenPublication>( "maven" ) {
-			artifactId = "flatlaf"
-			groupId = "com.formdev"
-
-			from( components["java"] )
-
-			artifact( tasks["sourcesJar"] )
-			artifact( tasks["javadocJar"] )
-
-			pom {
-				name.set( "FlatLaf" )
-				description.set( "Flat Look and Feel" )
-				url.set( "https://github.com/JFormDesigner/FlatLaf" )
-
-				licenses {
-					license {
-						name.set( "The Apache License, Version 2.0" )
-						url.set( "http://www.apache.org/licenses/LICENSE-2.0.txt" )
-					}
-				}
-
-				developers {
-					developer {
-						name.set( "Karl Tauber" )
-						organization.set( "FormDev Software GmbH" )
-						organizationUrl.set( "https://www.formdev.com/" )
-					}
-				}
-
-				scm {
-					url.set( "https://github.com/JFormDesigner/FlatLaf" )
-				}
-			}
-		}
-	}
-}
-
-bintray {
-	user = System.getenv( "BINTRAY_USER" ) ?: System.getProperty( "bintray.user" )
-	key = System.getenv( "BINTRAY_KEY" ) ?: System.getProperty( "bintray.key" )
-
-	setPublications( "maven" )
-
-	with( pkg ) {
-		repo = "flatlaf"
-		name = "flatlaf"
-		setLicenses( "Apache-2.0" )
-		vcsUrl = "https://github.com/JFormDesigner/FlatLaf"
-
-		with( version ) {
-			name = project.version.toString()
-		}
-
-		publish = true
-	}
+flatlafPublish {
+	artifactId = "flatlaf"
+	name = "FlatLaf"
+	description = "Flat Look and Feel"
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatClientProperties.java

@@ -16,6 +16,7 @@
 
 package com.formdev.flatlaf;
 
+import java.awt.Color;
 import java.util.Objects;
 import javax.swing.JComponent;
 
@@ -24,18 +25,295 @@ import javax.swing.JComponent;
  */
 public interface FlatClientProperties
 {
+	/**
+	 * Specifies type of a button.
+	 * <p>
+	 * <strong>Components</strong> {@link javax.swing.JButton} and {@link javax.swing.JToggleButton}<br>
+	 * <strong>Value type</strong> {@link java.lang.String}<br>
+	 * <strong>Allowed Values</strong> {@link #BUTTON_TYPE_SQUARE}, {@link #BUTTON_TYPE_ROUND_RECT},
+	 * {@link #BUTTON_TYPE_TAB}, {@link #BUTTON_TYPE_HELP} and {@link BUTTON_TYPE_TOOLBAR_BUTTON}
+	 */
 	String BUTTON_TYPE = "JButton.buttonType";
+
+	/**
+	 * Paint the button with square edges.
+	 * <p>
+	 * <strong>Components</strong> {@link javax.swing.JButton} and {@link javax.swing.JToggleButton}
+	 *
+	 * @see #BUTTON_TYPE
+	 */
+	String BUTTON_TYPE_SQUARE = "square";
+
+	/**
+	 * Paint the button with round edges.
+	 * <p>
+	 * <strong>Components</strong> {@link javax.swing.JButton} and {@link javax.swing.JToggleButton}
+	 *
+	 * @see #BUTTON_TYPE
+	 */
+	String BUTTON_TYPE_ROUND_RECT = "roundRect";
+
+	/**
+	 * Paint the toggle button in tab style.
+	 * <p>
+	 * <strong>Components</strong> {@link javax.swing.JToggleButton}
+	 *
+	 * @see #BUTTON_TYPE
+	 */
+	String BUTTON_TYPE_TAB = "tab";
+
+	/**
+	 * Paint a help button (circle with question mark).
+	 * <p>
+	 * <strong>Components</strong> {@link javax.swing.JButton}
+	 *
+	 * @see #BUTTON_TYPE
+	 */
 	String BUTTON_TYPE_HELP = "help";
 
+	/**
+	 * Paint the button in toolbar style.
+	 * <p>
+	 * <strong>Components</strong> {@link javax.swing.JButton} and {@link javax.swing.JToggleButton}
+	 *
+	 * @see #BUTTON_TYPE
+	 */
+	String BUTTON_TYPE_TOOLBAR_BUTTON = "toolBarButton";
+
+	/**
+	 * Specifies selected state of a checkbox.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JCheckBox}<br>
+	 * <strong>Value type</strong> {@link java.lang.String}<br>
+	 * <strong>Allowed Values</strong> {@link #SELECTED_STATE_INDETERMINATE}
+	 */
 	String SELECTED_STATE = "JButton.selectedState";
+
+	/**
+	 * Paint an indeterminate state on a checkbox.
+	 *
+	 * @see #SELECTED_STATE
+	 */
 	String SELECTED_STATE_INDETERMINATE = "indeterminate";
 
+	/**
+	 * Specifies minimum width of a component.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JButton}, {@link javax.swing.JToggleButton},
+	 * {@link javax.swing.JComboBox}, {@link javax.swing.JSpinner} and {@link javax.swing.text.JTextComponent}<br>
+	 * <strong>Value type</strong> {@link java.lang.Integer}<br>
+	 */
+	String MINIMUM_WIDTH = "JComponent.minimumWidth";
+
+	/**
+	 * Specifies minimum height of a component.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JButton} and {@link javax.swing.JToggleButton}<br>
+	 * <strong>Value type</strong> {@link java.lang.Integer}<br>
+	 */
+	String MINIMUM_HEIGHT = "JComponent.minimumHeight";
+
+	/**
+	 * Specifies the outline color of the component border.
+	 * <p>
+	 * <strong>Components</strong> {@link javax.swing.JButton}, {@link javax.swing.JComboBox},
+	 * {@link javax.swing.JFormattedTextField}, {@link javax.swing.JPasswordField},
+	 * {@link javax.swing.JScrollPane}, {@link javax.swing.JSpinner},
+	 * {@link javax.swing.JTextField} and {@link javax.swing.JToggleButton}<br>
+	 * <strong>Value type</strong> {@link java.lang.String} or {@link java.awt.Color} or {@link java.awt.Color}[2]<br>
+	 * <strong>Allowed Values</strong> {@link #OUTLINE_ERROR}, {@link #OUTLINE_WARNING},
+	 * any color (type {@link java.awt.Color}) or an array of two colors (type {@link java.awt.Color}[2])
+	 * where the first color is for focused state and the second for unfocused state
+	 */
+	String OUTLINE = "JComponent.outline";
+
+	/**
+	 * Paint the component border in another color (usually reddish) to indicate an error.
+	 *
+	 * @see #OUTLINE
+	 */
+	String OUTLINE_ERROR = "error";
+
+	/**
+	 * Paint the component border in another color (usually yellowish) to indicate a warning.
+	 *
+	 * @see #OUTLINE
+	 */
+	String OUTLINE_WARNING = "warning";
+
+	/**
+	 * Paint the component with round edges.
+	 * <p>
+	 * <strong>Components</strong> {@link javax.swing.JComboBox}, {@link javax.swing.JSpinner},
+	 * {@link javax.swing.JTextField}, {@link javax.swing.JFormattedTextField} and {@link javax.swing.JPasswordField}
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 */
+	String COMPONENT_ROUND_RECT = "JComponent.roundRect";
+
+	/**
+	 * Specifies whether a drop shadow is painted if the component is shown in a popup
+	 * or if the component is the owner of another component that is shown in a popup.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JComponent}<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 */
+	String POPUP_DROP_SHADOW_PAINTED = "Popup.dropShadowPainted";
+
+	/**
+	 * Specifies whether the progress bar has always the larger height even if no string is painted.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JProgressBar}<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 */
+	String PROGRESS_BAR_LARGE_HEIGHT = "JProgressBar.largeHeight";
+
+	/**
+	 * Specifies whether the progress bar is paint with square edges.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JProgressBar}<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 */
+	String PROGRESS_BAR_SQUARE = "JProgressBar.square";
+
+	/**
+	 * Specifies whether the decrease/increase arrow buttons of a scrollbar are shown.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JScrollBar} or {@link javax.swing.JScrollPane}<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 */
+	String SCROLL_BAR_SHOW_BUTTONS = "JScrollBar.showButtons";
+
+	/**
+	 * Specifies whether separators are shown between tabs.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTabbedPane}<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 */
+	String TABBED_PANE_SHOW_TAB_SEPARATORS = "JTabbedPane.showTabSeparators";
+
+	/**
+	 * Specifies whether a full border is painted around a tabbed pane.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTabbedPane}<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 */
 	String TABBED_PANE_HAS_FULL_BORDER = "JTabbedPane.hasFullBorder";
 
+	/**
+	 * Specifies the height of a tab.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTabbedPane}<br>
+	 * <strong>Value type</strong> {@link java.lang.Integer}
+	 */
+	String TABBED_PANE_TAB_HEIGHT = "JTabbedPane.tabHeight";
+
+	/**
+	 * Specifies whether all text is selected when the text component gains focus.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTextField} (and subclasses)<br>
+	 * <strong>Value type</strong> {@link java.lang.String}<br>
+	 * <strong>Allowed Values</strong> {@link #SELECT_ALL_ON_FOCUS_POLICY_NEVER},
+	 * {@link #SELECT_ALL_ON_FOCUS_POLICY_ONCE} (default) or
+	 * {@link #SELECT_ALL_ON_FOCUS_POLICY_ALWAYS}
+	 */
+	String SELECT_ALL_ON_FOCUS_POLICY = "JTextField.selectAllOnFocusPolicy";
+
+	/**
+	 * Never select all text when the text component gains focus.
+	 *
+	 * @see #SELECT_ALL_ON_FOCUS_POLICY
+	 */
+	String SELECT_ALL_ON_FOCUS_POLICY_NEVER = "never";
+
+	/**
+	 * Select all text when the text component gains focus for the first time
+	 * and selection was not modified (is at end of text).
+	 * This is the default.
+	 *
+	 * @see #SELECT_ALL_ON_FOCUS_POLICY
+	 */
+	String SELECT_ALL_ON_FOCUS_POLICY_ONCE = "once";
+
+	/**
+	 * Always select all text when the text component gains focus.
+	 *
+	 * @see #SELECT_ALL_ON_FOCUS_POLICY
+	 */
+	String SELECT_ALL_ON_FOCUS_POLICY_ALWAYS = "always";
+
+	/**
+	 * Placeholder text that is only painted if the text field is empty.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTextField} (and subclasses) or {@link javax.swing.JComboBox}<br>
+	 * <strong>Value type</strong> {@link java.lang.String}
+	 */
+	String PLACEHOLDER_TEXT = "JTextField.placeholderText";
+
+	/**
+	 * Height of underline if toggle button type is {@link #BUTTON_TYPE_TAB}.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JToggleButton}<br>
+	 * <strong>Value type</strong> {@link java.lang.Integer}
+	 */
+	String TAB_BUTTON_UNDERLINE_HEIGHT = "JToggleButton.tab.underlineHeight";
+
+	/**
+	 * Color of underline if toggle button type is {@link #BUTTON_TYPE_TAB}.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JToggleButton}<br>
+	 * <strong>Value type</strong> {@link java.awt.Color}
+	 */
+	String TAB_BUTTON_UNDERLINE_COLOR = "JToggleButton.tab.underlineColor";
+
+	/**
+	 * Background color if selected and toggle button type is {@link #BUTTON_TYPE_TAB}.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JToggleButton}<br>
+	 * <strong>Value type</strong> {@link java.awt.Color}
+	 */
+	String TAB_BUTTON_SELECTED_BACKGROUND = "JToggleButton.tab.selectedBackground";
+
 	/**
 	 * Checks whether a client property of a component has the given value.
 	 */
 	static boolean clientPropertyEquals( JComponent c, String key, Object value ) {
 		return Objects.equals( c.getClientProperty( key ), value );
 	}
+
+	/**
+	 * Checks whether a client property of a component is a boolean and returns its value.
+	 * If the client property is not set, or not a boolean, defaultValue is returned.
+	 */
+	static boolean clientPropertyBoolean( JComponent c, String key, boolean defaultValue ) {
+		Object value = c.getClientProperty( key );
+		return (value instanceof Boolean) ? (boolean) value : defaultValue;
+	}
+
+	/**
+	 * Checks whether a client property of a component is an integer and returns its value.
+	 * If the client property is not set, or not an integer, defaultValue is returned.
+	 */
+	static int clientPropertyInt( JComponent c, String key, int defaultValue ) {
+		Object value = c.getClientProperty( key );
+		return (value instanceof Integer) ? (int) value : defaultValue;
+	}
+
+	/**
+	 * Checks whether a client property of a component is a color and returns its value.
+	 * If the client property is not set, or not a color, defaultValue is returned.
+	 */
+	static Color clientPropertyColor( JComponent c, String key, Color defaultValue ) {
+		Object value = c.getClientProperty( key );
+		return (value instanceof Color) ? (Color) value : defaultValue;
+	}
+
+	static int clientPropertyChoice( JComponent c, String key, String... choices ) {
+		Object value = c.getClientProperty( key );
+		for( int i = 0; i < choices.length; i++ ) {
+			if( choices[i].equals( value ) )
+				return i;
+
+		}
+		return -1;
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatDarculaLaf.java

@@ -32,11 +32,11 @@ public class FlatDarculaLaf
 
 	@Override
 	public String getName() {
-		return "Flat Darcula";
+		return "FlatLaf Darcula";
 	}
 
 	@Override
 	public String getDescription() {
-		return "Flat Darcula Look and Feel";
+		return "FlatLaf Darcula Look and Feel";
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatDarkLaf.java

@@ -32,12 +32,12 @@ public class FlatDarkLaf
 
 	@Override
 	public String getName() {
-		return "Flat Dark";
+		return "FlatLaf Dark";
 	}
 
 	@Override
 	public String getDescription() {
-		return "Flat Dark Look and Feel";
+		return "FlatLaf Dark Look and Feel";
 	}
 
 	@Override

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatDefaultsAddon.java

@@ -17,17 +17,19 @@
 package com.formdev.flatlaf;
 
 import java.io.InputStream;
+import javax.swing.LookAndFeel;
+import javax.swing.UIDefaults;
 
 /**
  * Addon for FlatLaf UI defaults.
  *
  * Allows loading of additional .properties files from addon JARs.
  * {@link java.util.ServiceLoader} is used to load extensions of this class from addon JARs.
- *
+ * <p>
  * If you extend this class in a addon JAR, you also have to add a text file named
  * {@code META-INF/services/com.formdev.flatlaf.FlatDefaultsAddon}
  * to the addon JAR. The file must contain a single line with the class name.
- *
+ * <p>
  * See 'flatlaf-swingx' addon for an example
  *
  * @author Karl Tauber
@@ -37,6 +39,33 @@ public abstract class FlatDefaultsAddon
 	/**
 	 * Finds an addon .properties file for the given LaF class and returns
 	 * it as input stream. Or {@code null} if not found.
+	 * <p>
+	 * This default implementation finds addon .properties file for the given LaF class
+	 * in the same package as the subclass.
+	 * <p>
+	 * Override this method to load addon .properties files from other locations.
 	 */
-	public abstract InputStream getDefaults( Class<?> lafClass );
+	public InputStream getDefaults( Class<?> lafClass ) {
+		Class<?> addonClass = this.getClass();
+		String propertiesName = '/' + addonClass.getPackage().getName().replace( '.', '/' )
+			+ '/' + lafClass.getSimpleName() + ".properties";
+		return addonClass.getResourceAsStream( propertiesName );
+	}
+
+	/**
+	 * Allows modifying UI defaults after loading UI defaults.
+	 * The default implementation does nothing.
+	 */
+	public void afterDefaultsLoading( LookAndFeel laf, UIDefaults defaults ) {
+	}
+
+	/**
+	 * Returns the priority used to sort addon loading.
+	 * The order is only important if you want overwrite UI defaults of other addons.
+	 * Lower numbers mean higher priority.
+	 * Returns 10000 by default.
+	 */
+	public int getPriority() {
+		return 10000;
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatIconColors.java

@@ -0,0 +1,89 @@
+/*
+ * Copyright 2020 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf;
+
+/**
+ * Default color palette for action icons and object icons.
+ * <p>
+ * The idea is to use only this well defined set of colors in SVG icons and
+ * then they are replaced at runtime to dark variants or to other theme colors.
+ * Then a single SVG icon (light variant) can be used for dark themes too.
+ * IntelliJ Platform uses this mechanism to allow themes to change IntelliJ Platform icons.
+ * <p>
+ * Use the {@code *_DARK} colors only in {@code *_dark.svg} files.
+ * <p>
+ * The colors are based on IntelliJ Platform
+ *   <a href="https://jetbrains.design/intellij/principles/icons/#action-icons">Action icons</a>
+ * and
+ *   <a href="https://jetbrains.design/intellij/principles/icons/#noun-icons">Noun icons</a>
+ * <p>
+ * These colors may be changed by IntelliJ Platform themes.
+ * <p>
+ * You may use these colors also in your application (outside of SVG icons), but do
+ * not use the RGB values defined in this enum.<br>
+ * Instead use {@code UIManager.getColor( FlatIconColors.ACTIONS_GREY.key )}.
+ *
+ * @author Karl Tauber
+ */
+public enum FlatIconColors
+{
+	// colors for action icons
+	// see https://jetbrains.design/intellij/principles/icons/#action-icons
+	ACTIONS_RED				( 0xDB5860, "Actions.Red", true, false ),
+	ACTIONS_RED_DARK		( 0xC75450, "Actions.Red", false, true ),
+	ACTIONS_YELLOW			( 0xEDA200, "Actions.Yellow", true, false ),
+	ACTIONS_YELLOW_DARK		( 0xF0A732, "Actions.Yellow", false, true ),
+	ACTIONS_GREEN			( 0x59A869, "Actions.Green", true, false ),
+	ACTIONS_GREEN_DARK		( 0x499C54, "Actions.Green", false, true ),
+	ACTIONS_BLUE			( 0x389FD6, "Actions.Blue", true, false ),
+	ACTIONS_BLUE_DARK		( 0x3592C4, "Actions.Blue", false, true ),
+	ACTIONS_GREY			( 0x6E6E6E, "Actions.Grey", true, false ),
+	ACTIONS_GREY_DARK		( 0xAFB1B3, "Actions.Grey", false, true ),
+	ACTIONS_GREYINLINE		( 0x7F8B91, "Actions.GreyInline", true, false ),
+	ACTIONS_GREYINLINE_DARK	( 0x7F8B91, "Actions.GreyInline", false, true ),
+
+	// colors for object icons
+	// see https://jetbrains.design/intellij/principles/icons/#noun-icons
+	OBJECTS_GREY			( 0x9AA7B0, "Objects.Grey" ),
+	OBJECTS_BLUE			( 0x40B6E0, "Objects.Blue" ),
+	OBJECTS_GREEN			( 0x62B543, "Objects.Green" ),
+	OBJECTS_YELLOW			( 0xF4AF3D, "Objects.Yellow" ),
+	OBJECTS_YELLOW_DARK		( 0xD9A343, "Objects.YellowDark" ),
+	OBJECTS_PURPLE			( 0xB99BF8, "Objects.Purple" ),
+	OBJECTS_PINK			( 0xF98B9E, "Objects.Pink" ),
+	OBJECTS_RED				( 0xF26522, "Objects.Red" ),
+	OBJECTS_RED_STATUS		( 0xE05555, "Objects.RedStatus" ),
+	OBJECTS_GREEN_ANDROID	( 0xA4C639, "Objects.GreenAndroid" ),
+	OBJECTS_BLACK_TEXT		( 0x231F20, "Objects.BlackText" );
+
+	public final int rgb;
+	public final String key;
+
+	public final boolean light;
+	public final boolean dark;
+
+	FlatIconColors( int rgb, String key ) {
+		this( rgb, key, true, true );
+	}
+
+	FlatIconColors( int rgb, String key, boolean light, boolean dark ) {
+		this.rgb = rgb;
+		this.key = key;
+		this.light = light;
+		this.dark = dark;
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatInputMaps.java

@@ -0,0 +1,644 @@
+/*
+ * Copyright 2020 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf;
+
+import javax.swing.InputMap;
+import javax.swing.JTextField;
+import javax.swing.KeyStroke;
+import javax.swing.LookAndFeel;
+import javax.swing.UIDefaults;
+import javax.swing.UIDefaults.LazyValue;
+import javax.swing.plaf.InputMapUIResource;
+import com.formdev.flatlaf.util.SystemInfo;
+import static javax.swing.text.DefaultEditorKit.*;
+
+/**
+ * @author Karl Tauber
+ */
+class FlatInputMaps
+{
+	static void initInputMaps( UIDefaults defaults ) {
+		initBasicInputMaps( defaults );
+		initTextComponentInputMaps( defaults );
+
+		if( SystemInfo.IS_MAC )
+			initMacInputMaps( defaults );
+	}
+
+	private static void initBasicInputMaps( UIDefaults defaults ) {
+		defaults.put( "Button.focusInputMap", new UIDefaults.LazyInputMap( new Object[] {
+			"SPACE", "pressed",
+			"released SPACE", "released"
+		} ) );
+
+		modifyInputMap( defaults, "ComboBox.ancestorInputMap",
+			"SPACE", "spacePopup",
+
+			"UP", mac( "selectPrevious2", "selectPrevious" ),
+			"DOWN", mac( "selectNext2", "selectNext" ),
+			"KP_UP", mac( "selectPrevious2", "selectPrevious" ),
+			"KP_DOWN", mac( "selectNext2", "selectNext" ),
+
+			mac( "alt UP", null ), "togglePopup",
+			mac( "alt DOWN", null ), "togglePopup",
+			mac( "alt KP_UP", null ), "togglePopup",
+			mac( "alt KP_DOWN", null ), "togglePopup"
+		);
+
+		if( !SystemInfo.IS_MAC ) {
+			modifyInputMap( defaults, "FileChooser.ancestorInputMap",
+				"F2", "editFileName",
+				"BACK_SPACE", "Go Up"
+			);
+		}
+
+		// join ltr and rtl bindings to fix up/down/etc keys in right-to-left component orientation
+		Object[] bindings = (Object[]) defaults.get( "PopupMenu.selectedWindowInputMapBindings" );
+		Object[] rtlBindings = (Object[]) defaults.get( "PopupMenu.selectedWindowInputMapBindings.RightToLeft" );
+		if( bindings != null && rtlBindings != null ) {
+			Object[] newBindings = new Object[bindings.length + rtlBindings.length];
+			System.arraycopy( bindings, 0, newBindings, 0, bindings.length );
+			System.arraycopy( rtlBindings, 0, newBindings, bindings.length, rtlBindings.length );
+			defaults.put( "PopupMenu.selectedWindowInputMapBindings.RightToLeft", newBindings );
+		}
+
+		modifyInputMap( defaults, "TabbedPane.ancestorInputMap",
+			"ctrl TAB", "navigateNext",
+			"shift ctrl TAB", "navigatePrevious"
+		);
+
+		modifyInputMap( defaults, "Table.ancestorInputMap",
+			// swap to make it consistent with List and Tree
+			"HOME", "selectFirstRow",
+			"END", "selectLastRow",
+			"shift HOME", "selectFirstRowExtendSelection",
+			"shift END", "selectLastRowExtendSelection",
+			mac( "ctrl HOME", null ), "selectFirstColumn",
+			mac( "ctrl END", null ), "selectLastColumn",
+			mac( "shift ctrl HOME", null ), "selectFirstColumnExtendSelection",
+			mac( "shift ctrl END", null ), "selectLastColumnExtendSelection"
+		);
+
+		if( !SystemInfo.IS_MAC ) {
+			modifyInputMap( defaults, "Tree.focusInputMap",
+				"ADD", "expand",
+				"SUBTRACT", "collapse"
+			);
+		}
+	}
+
+	private static void initTextComponentInputMaps( UIDefaults defaults ) {
+		Object[] commonTextComponentBindings = {
+			// move caret one character (without selecting text)
+			"LEFT", backwardAction,
+			"RIGHT", forwardAction,
+			"KP_LEFT", backwardAction,
+			"KP_RIGHT", forwardAction,
+
+			// move caret one character and select text
+			"shift LEFT", selectionBackwardAction,
+			"shift RIGHT", selectionForwardAction,
+			"shift KP_LEFT", selectionBackwardAction,
+			"shift KP_RIGHT", selectionForwardAction,
+
+			// move caret to word (without selecting text)
+			mac( "ctrl LEFT", "alt LEFT" ), previousWordAction,
+			mac( "ctrl RIGHT", "alt RIGHT" ), nextWordAction,
+			mac( "ctrl KP_LEFT", "alt KP_LEFT" ), previousWordAction,
+			mac( "ctrl KP_RIGHT", "alt KP_RIGHT" ), nextWordAction,
+
+			// move caret to word and select text
+			mac( "ctrl shift LEFT", "shift alt LEFT" ), selectionPreviousWordAction,
+			mac( "ctrl shift RIGHT", "shift alt RIGHT" ), selectionNextWordAction,
+			mac( "ctrl shift KP_LEFT", "shift alt KP_LEFT" ), selectionPreviousWordAction,
+			mac( "ctrl shift KP_RIGHT", "shift alt KP_RIGHT" ), selectionNextWordAction,
+
+			// move caret to line begin/end (without selecting text)
+			mac( "HOME", "meta LEFT" ), beginLineAction,
+			mac( "END", "meta RIGHT" ), endLineAction,
+
+			// move caret to line begin/end and select text
+			mac( "shift HOME", "shift meta LEFT" ), selectionBeginLineAction,
+			mac( "shift END", "shift meta RIGHT" ), selectionEndLineAction,
+
+			// select all/none
+			mac( "ctrl A", "meta A" ), selectAllAction,
+			mac( "ctrl BACK_SLASH", "meta BACK_SLASH" ), "unselect", // DefaultEditorKit.unselectAction
+
+			// delete previous/next character
+			"BACK_SPACE", deletePrevCharAction,
+			"shift BACK_SPACE", deletePrevCharAction,
+			"ctrl H", deletePrevCharAction,
+			"DELETE", deleteNextCharAction,
+
+			// delete previous/next word
+			mac( "ctrl BACK_SPACE", "alt BACK_SPACE" ), deletePrevWordAction,
+			mac( "ctrl DELETE", "alt DELETE" ), deleteNextWordAction,
+
+			// clipboard
+			mac( "ctrl X", "meta X" ), cutAction,
+			mac( "ctrl C", "meta C" ), copyAction,
+			mac( "ctrl V", "meta V" ), pasteAction,
+			"CUT", cutAction,
+			"COPY", copyAction,
+			"PASTE", pasteAction,
+			mac( "shift DELETE", null ), cutAction,
+			mac( "control INSERT", null ), copyAction,
+			mac( "shift INSERT", null ), pasteAction,
+
+			// misc
+			"control shift O", "toggle-componentOrientation", // DefaultEditorKit.toggleComponentOrientation
+		};
+
+		Object[] macCommonTextComponentBindings = SystemInfo.IS_MAC ? new Object[] {
+			// move caret one character (without selecting text)
+			"ctrl B", backwardAction,
+			"ctrl F", forwardAction,
+
+			// move caret to document begin/end (without selecting text)
+			"HOME", beginAction,
+			"END", endAction,
+			"meta UP", beginAction,
+			"meta DOWN", endAction,
+			"meta KP_UP", beginAction,
+			"meta KP_DOWN", endAction,
+			"ctrl P", beginAction,
+			"ctrl N", endAction,
+			"ctrl V", endAction,
+
+			// move caret to line begin/end (without selecting text)
+			"meta KP_LEFT", beginLineAction,
+			"meta KP_RIGHT", endLineAction,
+			"ctrl A", beginLineAction,
+			"ctrl E", endLineAction,
+
+			// move caret to document begin/end and select text
+			"shift meta UP", selectionBeginAction,
+			"shift meta DOWN", selectionEndAction,
+			"shift meta KP_UP", selectionBeginAction,
+			"shift meta KP_DOWN", selectionEndAction,
+			"shift HOME", selectionBeginAction,
+			"shift END", selectionEndAction,
+
+			// move caret to line begin/end and select text
+			"shift meta KP_LEFT", selectionBeginLineAction,
+			"shift meta KP_RIGHT", selectionEndLineAction,
+			"shift UP", selectionBeginLineAction,
+			"shift DOWN", selectionEndLineAction,
+			"shift KP_UP", selectionBeginLineAction,
+			"shift KP_DOWN", selectionEndLineAction,
+
+			// delete previous/next word
+			"ctrl W", deletePrevWordAction,
+			"ctrl D", deleteNextCharAction,
+		} : null;
+
+		Object[] singleLineTextComponentBindings = {
+			"ENTER", JTextField.notifyAction,
+		};
+
+		Object[] macSingleLineTextComponentBindings = SystemInfo.IS_MAC ? new Object[] {
+			// move caret to line begin/end (without selecting text)
+			"UP", beginLineAction,
+			"DOWN", endLineAction,
+			"KP_UP", beginLineAction,
+			"KP_DOWN", endLineAction,
+		} : null;
+
+		Object[] formattedTextComponentBindings = {
+			// reset
+			"ESCAPE", "reset-field-edit",
+
+			// increment/decrement
+			"UP", "increment",
+			"DOWN", "decrement",
+			"KP_UP", "increment",
+			"KP_DOWN", "decrement",
+		};
+
+		Object[] passwordTextComponentBindings = {
+			// move caret to line begin/end (without selecting text)
+			mac( "ctrl LEFT", "alt LEFT" ), beginLineAction,
+			mac( "ctrl RIGHT", "alt RIGHT" ), endLineAction,
+			mac( "ctrl KP_LEFT", "alt KP_LEFT" ), beginLineAction,
+			mac( "ctrl KP_RIGHT", "alt KP_RIGHT" ), endLineAction,
+
+			// move caret to line begin/end and select text
+			mac( "ctrl shift LEFT", "shift alt LEFT" ), selectionBeginLineAction,
+			mac( "ctrl shift RIGHT", "shift alt RIGHT" ), selectionEndLineAction,
+			mac( "ctrl shift KP_LEFT", "shift alt KP_LEFT" ), selectionBeginLineAction,
+			mac( "ctrl shift KP_RIGHT", "shift alt KP_RIGHT" ), selectionEndLineAction,
+
+			// delete previous/next word
+			mac( "ctrl BACK_SPACE", "alt BACK_SPACE" ), null,
+			mac( "ctrl DELETE", "alt DELETE" ), null,
+		};
+
+		Object[] multiLineTextComponentBindings = {
+			// move caret one line (without selecting text)
+			"UP", upAction,
+			"DOWN", downAction,
+			"KP_UP", upAction,
+			"KP_DOWN", downAction,
+
+			// move caret one line and select text
+			"shift UP", selectionUpAction,
+			"shift DOWN", selectionDownAction,
+			"shift KP_UP", selectionUpAction,
+			"shift KP_DOWN", selectionDownAction,
+
+			// move caret one page (without selecting text)
+			"PAGE_UP", pageUpAction,
+			"PAGE_DOWN", pageDownAction,
+
+			// move caret one page and select text
+			"shift PAGE_UP", "selection-page-up", // DefaultEditorKit.selectionPageUpAction
+			"shift PAGE_DOWN", "selection-page-down", // DefaultEditorKit.selectionPageDownAction
+			mac( "ctrl shift PAGE_UP", "shift meta PAGE_UP" ), "selection-page-left", // DefaultEditorKit.selectionPageLeftAction
+			mac( "ctrl shift PAGE_DOWN", "shift meta PAGE_DOWN" ), "selection-page-right", // DefaultEditorKit.selectionPageRightAction
+
+			// move caret to document begin/end (without selecting text)
+			mac( "ctrl HOME", "meta UP" ), beginAction,
+			mac( "ctrl END", "meta DOWN" ), endAction,
+
+			// move caret to document begin/end and select text
+			mac( "ctrl shift HOME", "shift meta UP" ), selectionBeginAction,
+			mac( "ctrl shift END", "shift meta DOWN" ), selectionEndAction,
+
+			// misc
+			"ENTER", insertBreakAction,
+			"TAB", insertTabAction,
+
+			// links
+			mac( "ctrl T", "meta T" ), "next-link-action",
+			mac( "ctrl shift T", "shift meta T" ), "previous-link-action",
+			mac( "ctrl SPACE", "meta SPACE" ), "activate-link-action",
+		};
+
+		Object[] macMultiLineTextComponentBindings = SystemInfo.IS_MAC ? new Object[] {
+			// move caret one line (without selecting text)
+			"ctrl N", downAction,
+			"ctrl P", upAction,
+
+			// move caret to beginning/end of paragraph and select text
+			"shift alt UP", selectionBeginParagraphAction,
+			"shift alt DOWN", selectionEndParagraphAction,
+			"shift alt KP_UP", selectionBeginParagraphAction,
+			"shift alt KP_DOWN", selectionEndParagraphAction,
+
+			// move caret one page (without selecting text)
+			"ctrl V", pageDownAction,
+		} : null;
+
+		defaults.put( "TextField.focusInputMap", new LazyInputMapEx(
+			commonTextComponentBindings,
+			macCommonTextComponentBindings,
+			singleLineTextComponentBindings,
+			macSingleLineTextComponentBindings
+		) );
+		defaults.put( "FormattedTextField.focusInputMap", new LazyInputMapEx(
+			commonTextComponentBindings,
+			macCommonTextComponentBindings,
+			singleLineTextComponentBindings,
+			macSingleLineTextComponentBindings,
+			formattedTextComponentBindings
+		) );
+		defaults.put( "PasswordField.focusInputMap", new LazyInputMapEx(
+			commonTextComponentBindings,
+			macCommonTextComponentBindings,
+			singleLineTextComponentBindings,
+			macSingleLineTextComponentBindings,
+			passwordTextComponentBindings
+		) );
+
+		Object multiLineInputMap = new LazyInputMapEx(
+			commonTextComponentBindings,
+			macCommonTextComponentBindings,
+			multiLineTextComponentBindings,
+			macMultiLineTextComponentBindings
+		);
+		defaults.put( "TextArea.focusInputMap", multiLineInputMap );
+		defaults.put( "TextPane.focusInputMap", multiLineInputMap );
+		defaults.put( "EditorPane.focusInputMap", multiLineInputMap );
+	}
+
+	private static void initMacInputMaps( UIDefaults defaults ) {
+		// list
+		modifyInputMap( defaults, "List.focusInputMap",
+			"meta A", "selectAll",
+			"meta C", "copy",
+			"meta V", "paste",
+			"meta X", "cut",
+
+			// let parent scroll pane do the macOS typical scrolling without changing selection
+			"HOME", null,
+			"END", null,
+			"PAGE_UP", null,
+			"PAGE_DOWN", null,
+
+			"ctrl A", null,
+			"ctrl BACK_SLASH", null,
+			"ctrl C", null,
+			"ctrl DOWN", null,
+			"ctrl END", null,
+			"ctrl HOME", null,
+			"ctrl INSERT", null,
+			"ctrl KP_DOWN", null,
+			"ctrl KP_LEFT", null,
+			"ctrl KP_RIGHT", null,
+			"ctrl KP_UP", null,
+			"ctrl LEFT", null,
+			"ctrl PAGE_DOWN", null,
+			"ctrl PAGE_UP", null,
+			"ctrl RIGHT", null,
+			"ctrl SLASH", null,
+			"ctrl SPACE", null,
+			"ctrl UP", null,
+			"ctrl V", null,
+			"ctrl X", null,
+			"SPACE", null,
+			"shift ctrl DOWN", null,
+			"shift ctrl END", null,
+			"shift ctrl HOME", null,
+			"shift ctrl KP_DOWN", null,
+			"shift ctrl KP_LEFT", null,
+			"shift ctrl KP_RIGHT", null,
+			"shift ctrl KP_UP", null,
+			"shift ctrl LEFT", null,
+			"shift ctrl PAGE_DOWN", null,
+			"shift ctrl PAGE_UP", null,
+			"shift ctrl RIGHT", null,
+			"shift ctrl SPACE", null,
+			"shift ctrl UP", null,
+			"shift DELETE", null,
+			"shift INSERT", null,
+			"shift SPACE", null
+		);
+		modifyInputMap( defaults, "List.focusInputMap.RightToLeft",
+			"ctrl KP_LEFT", null,
+			"ctrl KP_RIGHT", null,
+			"ctrl LEFT", null,
+			"ctrl RIGHT", null,
+			"shift ctrl KP_LEFT", null,
+			"shift ctrl KP_RIGHT", null,
+			"shift ctrl LEFT", null,
+			"shift ctrl RIGHT", null
+		);
+
+		// scrollpane
+		modifyInputMap( defaults, "ScrollPane.ancestorInputMap",
+			"END", "scrollEnd",
+			"HOME", "scrollHome",
+
+			"ctrl END", null,
+			"ctrl HOME", null,
+			"ctrl PAGE_DOWN", null,
+			"ctrl PAGE_UP", null
+		);
+		modifyInputMap( defaults, "ScrollPane.ancestorInputMap.RightToLeft",
+			"ctrl PAGE_DOWN", null,
+			"ctrl PAGE_UP", null
+		);
+
+		// tabbedpane
+		modifyInputMap( defaults, "TabbedPane.ancestorInputMap",
+			"ctrl UP", null,
+			"ctrl KP_UP", null
+		);
+		modifyInputMap( defaults, "TabbedPane.focusInputMap",
+			"ctrl DOWN", null,
+			"ctrl KP_DOWN", null
+		);
+
+		// table
+		modifyInputMap( defaults, "Table.ancestorInputMap",
+			"alt TAB", "focusHeader",
+			"shift alt TAB", "focusHeader",
+			"meta A", "selectAll",
+			"meta C", "copy",
+			"meta V", "paste",
+			"meta X", "cut",
+
+			// let parent scroll pane do the macOS typical scrolling without changing selection
+			"HOME", null,
+			"END", null,
+			"PAGE_UP", null,
+			"PAGE_DOWN", null,
+
+			"ctrl A", null,
+			"ctrl BACK_SLASH", null,
+			"ctrl C", null,
+			"ctrl DOWN", null,
+			"ctrl END", null,
+			"ctrl HOME", null,
+			"ctrl INSERT", null,
+			"ctrl KP_DOWN", null,
+			"ctrl KP_LEFT", null,
+			"ctrl KP_RIGHT", null,
+			"ctrl KP_UP", null,
+			"ctrl LEFT", null,
+			"ctrl PAGE_DOWN", null,
+			"ctrl PAGE_UP", null,
+			"ctrl RIGHT", null,
+			"ctrl SLASH", null,
+			"ctrl SPACE", null,
+			"ctrl UP", null,
+			"ctrl V", null,
+			"ctrl X", null,
+			"F2", null,
+			"F8", null,
+			"SPACE", null,
+			"shift ctrl DOWN", null,
+			"shift ctrl END", null,
+			"shift ctrl HOME", null,
+			"shift ctrl KP_DOWN", null,
+			"shift ctrl KP_LEFT", null,
+			"shift ctrl KP_RIGHT", null,
+			"shift ctrl KP_UP", null,
+			"shift ctrl LEFT", null,
+			"shift ctrl PAGE_DOWN", null,
+			"shift ctrl PAGE_UP", null,
+			"shift ctrl RIGHT", null,
+			"shift ctrl SPACE", null,
+			"shift ctrl UP", null,
+			"shift DELETE", null,
+			"shift INSERT", null,
+			"shift SPACE", null
+		);
+		modifyInputMap( defaults, "Table.ancestorInputMap.RightToLeft",
+			"ctrl KP_LEFT", null,
+			"ctrl KP_RIGHT", null,
+			"ctrl LEFT", null,
+			"ctrl RIGHT", null,
+			"shift ctrl KP_LEFT", null,
+			"shift ctrl KP_RIGHT", null,
+			"shift ctrl LEFT", null,
+			"shift ctrl RIGHT", null
+		);
+
+		// tree node expanding/collapsing
+		modifyInputMap( defaults, "Tree.focusInputMap",
+			"LEFT", "selectParent",
+			"RIGHT", "selectChild",
+			"KP_LEFT", "selectParent",
+			"KP_RIGHT", "selectChild",
+			"shift LEFT", "selectParent",
+			"shift RIGHT", "selectChild",
+			"shift KP_LEFT", "selectParent",
+			"shift KP_RIGHT", "selectChild",
+			"alt LEFT", "selectParent",
+			"alt RIGHT", "selectChild",
+			"alt KP_LEFT", "selectParent",
+			"alt KP_RIGHT", "selectChild",
+
+			"shift HOME", "selectFirstExtendSelection",
+			"shift END", "selectLastExtendSelection",
+
+		    "meta A", "selectAll",
+		    "meta C", "copy",
+		    "meta V", "paste",
+		    "meta X", "cut",
+
+			// let parent scroll pane do the macOS typical scrolling without changing selection
+			"HOME", null,
+			"END", null,
+			"PAGE_UP", null,
+			"PAGE_DOWN", null,
+
+		    "ctrl LEFT", null,
+			"ctrl RIGHT", null,
+			"ctrl KP_LEFT", null,
+			"ctrl KP_RIGHT", null,
+
+			"ctrl A", null,
+			"ctrl BACK_SLASH", null,
+			"ctrl C", null,
+			"ctrl DOWN", null,
+			"ctrl END", null,
+			"ctrl HOME", null,
+			"ctrl INSERT", null,
+			"ctrl KP_DOWN", null,
+			"ctrl KP_UP", null,
+			"ctrl PAGE_DOWN", null,
+			"ctrl PAGE_UP", null,
+			"ctrl SLASH", null,
+			"ctrl SPACE", null,
+			"ctrl UP", null,
+			"ctrl V", null,
+			"ctrl X", null,
+			"F2", null,
+			"SPACE", null,
+			"shift ctrl DOWN", null,
+			"shift ctrl END", null,
+			"shift ctrl HOME", null,
+			"shift ctrl KP_DOWN", null,
+			"shift ctrl KP_UP", null,
+			"shift ctrl PAGE_DOWN", null,
+			"shift ctrl PAGE_UP", null,
+			"shift ctrl SPACE", null,
+			"shift ctrl UP", null,
+			"shift DELETE", null,
+			"shift INSERT", null,
+			"shift PAGE_DOWN", null,
+			"shift PAGE_UP", null,
+			"shift SPACE", null
+		);
+		defaults.put( "Tree.focusInputMap.RightToLeft", new UIDefaults.LazyInputMap( new Object[] {
+			"LEFT", "selectChild",
+			"RIGHT", "selectParent",
+			"KP_LEFT", "selectChild",
+			"KP_RIGHT", "selectParent",
+			"shift LEFT", "selectChild",
+			"shift RIGHT", "selectParent",
+			"shift KP_LEFT", "selectChild",
+			"shift KP_RIGHT", "selectParent",
+			"alt LEFT", "selectChild",
+			"alt RIGHT", "selectParent",
+			"alt KP_LEFT", "selectChild",
+			"alt KP_RIGHT", "selectParent"
+		} ) );
+	}
+
+	private static void modifyInputMap( UIDefaults defaults, String key, Object... bindings ) {
+		// Note: not using `defaults.get(key)` here because this would resolve the lazy value
+		defaults.put( key, new LazyModifyInputMap( defaults.remove( key ), bindings ) );
+	}
+
+	private static <T> T mac( T value, T macValue ) {
+		return SystemInfo.IS_MAC ? macValue : value;
+	}
+
+	//---- class LazyInputMapEx -----------------------------------------------
+
+	/**
+	 * Lazily creates a input map.
+	 * Similar to {@link UIDefaults.LazyInputMap}, but can use multiple bindings arrays.
+	 */
+	private static class LazyInputMapEx
+		implements LazyValue
+	{
+		private final Object[][] bindingsArray;
+
+		LazyInputMapEx( Object[]... bindingsArray ) {
+			this.bindingsArray = bindingsArray;
+		}
+
+		@Override
+		public Object createValue( UIDefaults table ) {
+			InputMap inputMap = new InputMapUIResource();
+			for( Object[] bindings : bindingsArray )
+				LookAndFeel.loadKeyBindings( inputMap, bindings );
+			return inputMap;
+		}
+	}
+
+	//---- class LazyModifyInputMap -------------------------------------------
+
+	/**
+	 * Takes a (lazy) base input map and lazily applies modifications to it specified in bindings.
+	 */
+	private static class LazyModifyInputMap
+		implements LazyValue
+	{
+		private final Object baseInputMap;
+		private final Object[] bindings;
+
+		LazyModifyInputMap( Object baseInputMap, Object[] bindings ) {
+			this.baseInputMap = baseInputMap;
+			this.bindings = bindings;
+		}
+
+		@Override
+		public Object createValue( UIDefaults table ) {
+			// get base input map
+			InputMap inputMap = (baseInputMap instanceof LazyValue)
+				? (InputMap) ((LazyValue)baseInputMap).createValue( table )
+				: (InputMap) baseInputMap;
+
+			// modify input map (replace or remove)
+			for( int i = 0; i < bindings.length; i += 2 ) {
+				KeyStroke keyStroke = KeyStroke.getKeyStroke( (String) bindings[i] );
+				if( bindings[i + 1] != null )
+					inputMap.put( keyStroke, bindings[i + 1] );
+				else
+					inputMap.remove( keyStroke );
+			}
+
+			return inputMap;
+		}
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatIntelliJLaf.java

@@ -32,11 +32,11 @@ public class FlatIntelliJLaf
 
 	@Override
 	public String getName() {
-		return "Flat IntelliJ";
+		return "FlatLaf IntelliJ";
 	}
 
 	@Override
 	public String getDescription() {
-		return "Flat IntelliJ Look and Feel";
+		return "FlatLaf IntelliJ Look and Feel";
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatLaf.java

@@ -18,28 +18,47 @@ package com.formdev.flatlaf;
 
 import java.awt.Color;
 import java.awt.Component;
-import java.awt.Container;
 import java.awt.EventQueue;
 import java.awt.Font;
-import java.awt.KeyEventPostProcessor;
-import java.awt.KeyboardFocusManager;
+import java.awt.Image;
+import java.awt.RenderingHints;
 import java.awt.Toolkit;
 import java.awt.Window;
-import java.awt.event.KeyEvent;
+import java.awt.image.FilteredImageSource;
+import java.awt.image.ImageFilter;
+import java.awt.image.ImageProducer;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
+import java.lang.reflect.Method;
+import java.util.ArrayList;
 import java.util.List;
-import javax.swing.AbstractButton;
-import javax.swing.JLabel;
-import javax.swing.JTabbedPane;
+import java.util.Map;
+import java.util.Properties;
+import java.util.ServiceLoader;
+import java.util.function.Consumer;
+import java.util.function.Function;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import javax.swing.BorderFactory;
+import javax.swing.Icon;
+import javax.swing.ImageIcon;
+import javax.swing.JComponent;
 import javax.swing.LookAndFeel;
+import javax.swing.PopupFactory;
 import javax.swing.SwingUtilities;
 import javax.swing.UIDefaults;
 import javax.swing.UIManager;
 import javax.swing.UnsupportedLookAndFeelException;
+import javax.swing.UIDefaults.ActiveValue;
+import javax.swing.plaf.ColorUIResource;
 import javax.swing.plaf.FontUIResource;
+import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicLookAndFeel;
-import javax.swing.plaf.metal.MetalLookAndFeel;
+import javax.swing.text.StyleContext;
+import javax.swing.text.html.HTMLEditorKit;
+import com.formdev.flatlaf.ui.FlatPopupFactory;
+import com.formdev.flatlaf.util.GrayFilter;
+import com.formdev.flatlaf.util.MultiResolutionImageSupport;
 import com.formdev.flatlaf.util.SystemInfo;
 import com.formdev.flatlaf.util.UIScale;
 
@@ -51,34 +70,49 @@ import com.formdev.flatlaf.util.UIScale;
 public abstract class FlatLaf
 	extends BasicLookAndFeel
 {
-	private BasicLookAndFeel base;
+	static final Logger LOG = Logger.getLogger( FlatLaf.class.getName() );
+	private static final String DESKTOPFONTHINTS = "awt.font.desktophints";
 
 	private String desktopPropertyName;
+	private String desktopPropertyName2;
 	private PropertyChangeListener desktopPropertyListener;
 
-	private KeyEventPostProcessor mnemonicListener;
-	private static boolean altKeyPressed;
+	private static boolean aquaLoaded;
+	private static boolean updateUIPending;
+
+	private PopupFactory oldPopupFactory;
+	private MnemonicHandler mnemonicHandler;
+
+	private Consumer<UIDefaults> postInitialization;
 
 	public static boolean install( LookAndFeel newLookAndFeel ) {
 		try {
-		    UIManager.setLookAndFeel( newLookAndFeel );
-		    return true;
+			UIManager.setLookAndFeel( newLookAndFeel );
+			return true;
 		} catch( Exception ex ) {
-		    System.err.println( "Failed to initialize look and feel " + newLookAndFeel.getClass().getName() );
-		    return false;
+			LOG.log( Level.SEVERE, "FlatLaf: Failed to initialize look and feel '" + newLookAndFeel.getClass().getName() + "'.", ex );
+			return false;
 		}
 	}
 
+	/**
+	 * Returns the look and feel identifier.
+	 * <p>
+	 * Syntax: "FlatLaf - ${theme-name}"
+	 * <p>
+	 * Use {@code UIManager.getLookAndFeel().getID().startsWith( "FlatLaf" )}
+	 * to check whether the current look and feel is FlatLaf.
+	 */
 	@Override
 	public String getID() {
-		return getName();
+		return "FlatLaf - " + getName();
 	}
 
 	public abstract boolean isDark();
 
 	@Override
 	public boolean isNativeLookAndFeel() {
-		return true;
+		return false;
 	}
 
 	@Override
@@ -86,19 +120,40 @@ public abstract class FlatLaf
 		return true;
 	}
 
+	@Override
+	public Icon getDisabledIcon( JComponent component, Icon icon ) {
+		if( icon instanceof ImageIcon ) {
+			Object grayFilter = UIManager.get( "Component.grayFilter" );
+			ImageFilter filter = (grayFilter instanceof ImageFilter)
+				? (ImageFilter) grayFilter
+				: GrayFilter.createDisabledIconFilter( isDark() ); // fallback
+
+			Function<Image, Image> mapper = img -> {
+				ImageProducer producer = new FilteredImageSource( img.getSource(), filter );
+				return Toolkit.getDefaultToolkit().createImage( producer );
+			};
+
+			Image image = ((ImageIcon)icon).getImage();
+			return new ImageIconUIResource( MultiResolutionImageSupport.map( image, mapper ) );
+		}
+
+		return null;
+	}
+
 	@Override
 	public void initialize() {
-		getBase().initialize();
+		if( SystemInfo.IS_MAC )
+			initializeAqua();
 
 		super.initialize();
 
-		// add mnemonic listener
-		mnemonicListener = e -> {
-			if( e.getKeyCode() == KeyEvent.VK_ALT )
-				altKeyChanged( e.getID() == KeyEvent.KEY_PRESSED );
-			return false;
-		};
-		KeyboardFocusManager.getCurrentKeyboardFocusManager().addKeyEventPostProcessor( mnemonicListener );
+		// install popup factory
+		oldPopupFactory = PopupFactory.getSharedInstance();
+		PopupFactory.setSharedInstance( new FlatPopupFactory() );
+
+		// install mnemonic handler
+		mnemonicHandler = new MnemonicHandler();
+		mnemonicHandler.install();
 
 		// listen to desktop property changes to update UI if system font or scaling changes
 		if( SystemInfo.IS_WINDOWS ) {
@@ -106,112 +161,234 @@ public abstract class FlatLaf
 			//   Settings > Ease of Access > Display > Make text bigger (100% - 225%)
 			desktopPropertyName = "win.messagebox.font";
 		} else if( SystemInfo.IS_LINUX ) {
+			// Linux/Gnome allows changing font in "Tweaks" app
+			desktopPropertyName = "gnome.Gtk/FontName";
+
 			// Linux/Gnome allows extra scaling and larger text:
 			//   Settings > Devices > Displays > Scale (100% or 200%)
 			//   Settings > Universal access > Large Text (off or on, 125%)
-			desktopPropertyName = "gnome.Xft/DPI";
+			//   "Tweaks" app > Fonts > Scaling Factor (0,5 - 3)
+			desktopPropertyName2 = "gnome.Xft/DPI";
 		}
 		if( desktopPropertyName != null ) {
 			desktopPropertyListener = e -> {
-				reSetLookAndFeel();
+				String propertyName = e.getPropertyName();
+				if( desktopPropertyName.equals( propertyName ) || propertyName.equals( desktopPropertyName2 ) )
+					reSetLookAndFeel();
+				else if( DESKTOPFONTHINTS.equals( propertyName ) ) {
+					if( UIManager.getLookAndFeel() instanceof FlatLaf ) {
+						putAATextInfo( UIManager.getLookAndFeelDefaults() );
+						updateUILater();
+					}
+				}
 			};
-			Toolkit.getDefaultToolkit().addPropertyChangeListener( desktopPropertyName, desktopPropertyListener );
+			Toolkit toolkit = Toolkit.getDefaultToolkit();
+			toolkit.addPropertyChangeListener( desktopPropertyName, desktopPropertyListener );
+			if( desktopPropertyName2 != null )
+				toolkit.addPropertyChangeListener( desktopPropertyName2, desktopPropertyListener );
+			toolkit.addPropertyChangeListener( DESKTOPFONTHINTS, desktopPropertyListener );
 		}
+
+		// Following code should be ideally in initialize(), but needs color from UI defaults.
+		// Do not move this code to getDefaults() to avoid side effects in the case that
+		// getDefaults() is directly invoked from 3rd party code. E.g. `new FlatLightLaf().getDefaults()`.
+		postInitialization = defaults -> {
+			// update link color in HTML text
+			Color linkColor = defaults.getColor( "Component.linkColor" );
+			if( linkColor != null ) {
+				new HTMLEditorKit().getStyleSheet().addRule(
+					String.format( "a { color: #%06x; }", linkColor.getRGB() & 0xffffff ) );
+			}
+		};
 	}
 
 	@Override
 	public void uninitialize() {
 		// remove desktop property listener
 		if( desktopPropertyListener != null ) {
-			Toolkit.getDefaultToolkit().removePropertyChangeListener( desktopPropertyName, desktopPropertyListener );
+			Toolkit toolkit = Toolkit.getDefaultToolkit();
+			toolkit.removePropertyChangeListener( desktopPropertyName, desktopPropertyListener );
+			if( desktopPropertyName2 != null )
+				toolkit.removePropertyChangeListener( desktopPropertyName2, desktopPropertyListener );
+			toolkit.removePropertyChangeListener( DESKTOPFONTHINTS, desktopPropertyListener );
 			desktopPropertyName = null;
+			desktopPropertyName2 = null;
 			desktopPropertyListener = null;
 		}
 
-		// remove mnemonic listener
-		if( mnemonicListener != null ) {
-			KeyboardFocusManager.getCurrentKeyboardFocusManager().removeKeyEventPostProcessor( mnemonicListener );
-			mnemonicListener = null;
+		// uninstall popup factory
+		if( oldPopupFactory != null ) {
+			PopupFactory.setSharedInstance( oldPopupFactory );
+			oldPopupFactory = null;
 		}
 
-		if( base != null )
-			base.uninitialize();
+		// uninstall mnemonic handler
+		if( mnemonicHandler != null ) {
+			mnemonicHandler.uninstall();
+			mnemonicHandler = null;
+		}
+
+		// restore default link color
+		new HTMLEditorKit().getStyleSheet().addRule( "a { color: blue; }" );
+		postInitialization = null;
 
 		super.uninitialize();
 	}
 
 	/**
-	 * Get/create base LaF. This is used to grab base UI defaults from different LaFs.
-	 * E.g. on Mac from system dependent LaF, otherwise from Metal LaF.
+	 * Initialize Aqua LaF on macOS, which is required for using Mac screen menubar.
+	 * (at least on Java 8, since 9 it seems to work without it)
+	 * <p>
+	 * This loads the native library "osxui" and initializes JRSUI.
+	 * Because both are not unloaded/uninitialized, Aqua LaF is initialized only once.
 	 */
-	private BasicLookAndFeel getBase() {
-		if( base == null ) {
-			if( SystemInfo.IS_MAC ) {
-				// use Mac Aqua LaF as base
-				try {
-					base = (BasicLookAndFeel) Class.forName( "com.apple.laf.AquaLookAndFeel" ).newInstance();
-				} catch( Exception ex ) {
-					ex.printStackTrace();
-					throw new IllegalStateException();
-				}
+	private void initializeAqua() {
+		if( aquaLoaded )
+			return;
+
+		aquaLoaded = true;
+
+		// create macOS Aqua LaF
+		String aquaLafClassName = "com.apple.laf.AquaLookAndFeel";
+		BasicLookAndFeel aquaLaf;
+		try {
+			if( SystemInfo.IS_JAVA_9_OR_LATER ) {
+				Method m = UIManager.class.getMethod( "createLookAndFeel", String.class );
+				aquaLaf = (BasicLookAndFeel) m.invoke( null, "Mac OS X" );
 			} else
-				base = new MetalLookAndFeel();
+				aquaLaf = (BasicLookAndFeel) Class.forName( aquaLafClassName ).newInstance();
+		} catch( Exception ex ) {
+			LOG.log( Level.SEVERE, "FlatLaf: Failed to initialize Aqua look and feel '" + aquaLafClassName + "'.", ex );
+			throw new IllegalStateException();
 		}
-		return base;
+
+		// remember popup factory because aquaLaf.initialize() installs its own
+		// factory, which makes sub-menu rendering "jittery"
+		PopupFactory oldPopupFactory = PopupFactory.getSharedInstance();
+
+		// initialize Aqua LaF
+		aquaLaf.initialize();
+		aquaLaf.uninitialize();
+
+		// restore popup factory
+		PopupFactory.setSharedInstance( oldPopupFactory );
 	}
 
 	@Override
 	public UIDefaults getDefaults() {
-		UIDefaults defaults = getBase().getDefaults();
+		UIDefaults defaults = super.getDefaults();
 
-		// initialize some defaults (for overriding) that are used in basic UI delegates,
-		// but are not set in MetalLookAndFeel or BasicLookAndFeel
-		Color control = defaults.getColor( "control" );
-		defaults.put( "EditorPane.disabledBackground", control );
-		defaults.put( "EditorPane.inactiveBackground", control );
-		defaults.put( "FormattedTextField.disabledBackground", control );
-		defaults.put( "PasswordField.disabledBackground", control );
-		defaults.put( "TextArea.disabledBackground", control );
-		defaults.put( "TextArea.inactiveBackground", control );
-		defaults.put( "TextField.disabledBackground", control );
-		defaults.put( "TextPane.disabledBackground", control );
-		defaults.put( "TextPane.inactiveBackground", control );
+		// add resource bundle for localized texts
+		defaults.addResourceBundle( "com.formdev.flatlaf.resources.Bundle" );
 
-		// initialize some own defaults (for overriding)
-		defaults.put( "Spinner.disabledBackground", control );
-		defaults.put( "Spinner.disabledForeground", control );
-
-		// remember MenuBarUI from Mac Aqua LaF if Mac screen menubar is enabled
-		boolean useScreenMenuBar = SystemInfo.IS_MAC && "true".equals( System.getProperty( "apple.laf.useScreenMenuBar" ) );
-		Object aquaMenuBarUI = useScreenMenuBar ? defaults.get( "MenuBarUI" ) : null;
+		// initialize some defaults (for overriding) that are used in UI delegates,
+		// but are not set in BasicLookAndFeel
+		putDefaults( defaults, defaults.getColor( "control" ),
+			"EditorPane.disabledBackground",
+			"EditorPane.inactiveBackground",
+			"FormattedTextField.disabledBackground",
+			"PasswordField.disabledBackground",
+			"Spinner.disabledBackground",
+			"TextArea.disabledBackground",
+			"TextArea.inactiveBackground",
+			"TextField.disabledBackground",
+			"TextPane.disabledBackground",
+			"TextPane.inactiveBackground" );
+		putDefaults( defaults, defaults.getColor( "textInactiveText" ),
+			"Button.disabledText",
+			"CheckBox.disabledText",
+			"CheckBoxMenuItem.disabledForeground",
+			"Menu.disabledForeground",
+			"MenuItem.disabledForeground",
+			"RadioButton.disabledText",
+			"RadioButtonMenuItem.disabledForeground",
+			"Spinner.disabledForeground",
+			"ToggleButton.disabledText" );
+		putDefaults( defaults, defaults.getColor( "textText" ),
+			"DesktopIcon.foreground" );
 
 		initFonts( defaults );
-		UIDefaultsLoader.loadDefaultsFromProperties( getClass(), defaults );
+		initIconColors( defaults, isDark() );
+		FlatInputMaps.initInputMaps( defaults );
+
+		// get addons and sort them by priority
+		ServiceLoader<FlatDefaultsAddon> addonLoader = ServiceLoader.load( FlatDefaultsAddon.class );
+		List<FlatDefaultsAddon> addons = new ArrayList<>();
+		for( FlatDefaultsAddon addon : addonLoader )
+			addons.add( addon );
+		addons.sort( (addon1, addon2) -> addon1.getPriority() - addon2.getPriority() );
+
+		// load defaults from properties
+		List<Class<?>> lafClassesForDefaultsLoading = getLafClassesForDefaultsLoading();
+		if( lafClassesForDefaultsLoading != null )
+			UIDefaultsLoader.loadDefaultsFromProperties( lafClassesForDefaultsLoading, addons, getAdditionalDefaults(), isDark(), defaults );
+		else
+			UIDefaultsLoader.loadDefaultsFromProperties( getClass(), addons, getAdditionalDefaults(), isDark(), defaults );
 
 		// use Aqua MenuBarUI if Mac screen menubar is enabled
-		if( useScreenMenuBar )
-			defaults.put( "MenuBarUI", aquaMenuBarUI );
+		if( SystemInfo.IS_MAC && Boolean.getBoolean( "apple.laf.useScreenMenuBar" ) ) {
+			defaults.put( "MenuBarUI", "com.apple.laf.AquaMenuBarUI" );
+
+			// add defaults necessary for AquaMenuBarUI
+			defaults.put( "MenuBar.backgroundPainter", BorderFactory.createEmptyBorder() );
+		}
+
+		// initialize text antialiasing
+		putAATextInfo( defaults );
+
+		// apply additional defaults (e.g. from IntelliJ themes)
+		applyAdditionalDefaults( defaults );
+
+		// allow addons modifying UI defaults
+		for( FlatDefaultsAddon addon : addons )
+			addon.afterDefaultsLoading( this, defaults );
+
+		// add user scale factor to allow layout managers (e.g. MigLayout) to use it
+		defaults.put( "laf.scaleFactor", (ActiveValue) t -> {
+			return UIScale.getUserScaleFactor();
+		} );
+
+		if( postInitialization != null ) {
+			postInitialization.accept( defaults );
+			postInitialization = null;
+		}
 
 		return defaults;
 	}
 
+	void applyAdditionalDefaults( UIDefaults defaults ) {
+	}
+
+	protected List<Class<?>> getLafClassesForDefaultsLoading() {
+		return null;
+	}
+
+	protected Properties getAdditionalDefaults() {
+		return null;
+	}
+
 	private void initFonts( UIDefaults defaults ) {
 		FontUIResource uiFont = null;
 
 		if( SystemInfo.IS_WINDOWS ) {
 			Font winFont = (Font) Toolkit.getDefaultToolkit().getDesktopProperty( "win.messagebox.font" );
 			if( winFont != null )
-				uiFont = new FontUIResource( winFont );
+				uiFont = createCompositeFont( winFont.getFamily(), winFont.getStyle(), winFont.getSize() );
 
 		} else if( SystemInfo.IS_MAC ) {
-			Font font = defaults.getFont( "Label.font" );
-
-			if( SystemInfo.IS_MAC_OS_10_11_EL_CAPITAN_OR_LATER ) {
+			String fontName;
+			if( SystemInfo.IS_MAC_OS_10_15_CATALINA_OR_LATER ) {
+				// use Helvetica Neue font
+				fontName = "Helvetica Neue";
+			} else if( SystemInfo.IS_MAC_OS_10_11_EL_CAPITAN_OR_LATER ) {
 				// use San Francisco Text font
-				font = new FontUIResource( ".SF NS Text", font.getStyle(), font.getSize() );
+				fontName = ".SF NS Text";
+			} else {
+				// default font on older systems (see com.apple.laf.AquaFonts)
+				fontName = "Lucida Grande";
 			}
 
-			uiFont = (font instanceof FontUIResource) ? (FontUIResource) font : new FontUIResource( font );
+			uiFont = createCompositeFont( fontName, Font.PLAIN, 13 );
 
 		} else if( SystemInfo.IS_LINUX ) {
 			Font font = LinuxFontPolicy.getFont();
@@ -219,27 +396,102 @@ public abstract class FlatLaf
 		}
 
 		if( uiFont == null )
-			return;
+			uiFont = createCompositeFont( Font.SANS_SERIF, Font.PLAIN, 12 );
 
 		uiFont = UIScale.applyCustomScaleFactor( uiFont );
 
+		// use active value for all fonts to allow changing fonts in all components
+		// (similar as in Nimbus L&F) with:
+		//     UIManager.put( "defaultFont", myFont );
+		Object activeFont =  new ActiveFont( 1 );
+
 		// override fonts
 		for( Object key : defaults.keySet() ) {
-			if( key instanceof String && ((String)key).endsWith( ".font" ) )
-				defaults.put( key, uiFont );
+			if( key instanceof String && (((String)key).endsWith( ".font" ) || ((String)key).endsWith( "Font" )) )
+				defaults.put( key, activeFont );
 		}
-		defaults.put( "MenuItem.acceleratorFont", uiFont );
+
+		// use smaller font for progress bar
+		defaults.put( "ProgressBar.font", new ActiveFont( 0.85f ) );
+
+		// set default font
+		defaults.put( "defaultFont", uiFont );
 	}
 
-	public static List<String> split( String str, char delim ) {
-		return UIDefaultsLoader.split( str, delim );
+	static FontUIResource createCompositeFont( String family, int style, int size ) {
+		// using StyleContext.getFont() here because it uses
+		// sun.font.FontUtilities.getCompositeFontUIResource()
+		// and creates a composite font that is able to display all Unicode characters
+		Font font = StyleContext.getDefaultStyleContext().getFont( family, style, size );
+		return (font instanceof FontUIResource) ? (FontUIResource) font : new FontUIResource( font );
+	}
+
+	/**
+	 * Adds the default color palette for action icons and object icons to the given UIDefaults.
+	 * <p>
+	 * This method is public and static to allow using the color palette with
+	 * other LaFs (e.g. Windows LaF). To do so invoke:
+	 *   {@code FlatLaf.initIconColors( UIManager.getLookAndFeelDefaults(), false );}
+	 * after
+	 *   {@code UIManager.setLookAndFeel( ... );}.
+	 * <p>
+	 * The colors are based on IntelliJ Platform
+	 *   <a href="https://jetbrains.design/intellij/principles/icons/#action-icons">Action icons</a>
+	 * and
+	 *   <a href="https://jetbrains.design/intellij/principles/icons/#noun-icons">Noun icons</a>
+	 * <p>
+	 * These colors may be changed by IntelliJ Platform themes.
+	 */
+	public static void initIconColors( UIDefaults defaults, boolean dark ) {
+		for( FlatIconColors c : FlatIconColors.values() ) {
+			if( c.light == !dark || c.dark == dark )
+				defaults.put( c.key, new ColorUIResource( c.rgb ) );
+		}
+	}
+
+	private void putAATextInfo( UIDefaults defaults ) {
+		if( SystemInfo.IS_JAVA_9_OR_LATER ) {
+			Object desktopHints = Toolkit.getDefaultToolkit().getDesktopProperty( DESKTOPFONTHINTS );
+			if( desktopHints instanceof Map ) {
+				@SuppressWarnings( "unchecked" )
+				Map<Object, Object> hints = (Map<Object, Object>) desktopHints;
+				Object aaHint = hints.get( RenderingHints.KEY_TEXT_ANTIALIASING );
+				if( aaHint != null &&
+					aaHint != RenderingHints.VALUE_TEXT_ANTIALIAS_OFF &&
+					aaHint != RenderingHints.VALUE_TEXT_ANTIALIAS_DEFAULT )
+				{
+					defaults.put( RenderingHints.KEY_TEXT_ANTIALIASING, aaHint );
+					defaults.put( RenderingHints.KEY_TEXT_LCD_CONTRAST,
+						hints.get( RenderingHints.KEY_TEXT_LCD_CONTRAST ) );
+				}
+			}
+		} else {
+			// Java 8
+			try {
+				Object key = Class.forName( "sun.swing.SwingUtilities2" )
+					.getField( "AA_TEXT_PROPERTY_KEY" )
+					.get( null );
+				Object value = Class.forName( "sun.swing.SwingUtilities2$AATextInfo" )
+					.getMethod( "getAATextInfo", boolean.class )
+					.invoke( null, true );
+				defaults.put( key, value );
+			} catch( Exception ex ) {
+				Logger.getLogger( FlatLaf.class.getName() ).log( Level.SEVERE, null, ex );
+				throw new RuntimeException( ex );
+			}
+		}
+	}
+
+	private void putDefaults( UIDefaults defaults, Object value, String... keys ) {
+		for( String key : keys )
+			defaults.put( key, value );
 	}
 
 	private static void reSetLookAndFeel() {
 		EventQueue.invokeLater( () -> {
+			LookAndFeel lookAndFeel = UIManager.getLookAndFeel();
 			try {
 				// re-set current LaF
-				LookAndFeel lookAndFeel = UIManager.getLookAndFeel();
 				UIManager.setLookAndFeel( lookAndFeel );
 
 				// must fire property change events ourself because old and new LaF are the same
@@ -250,13 +502,13 @@ public abstract class FlatLaf
 				// update UI
 				updateUI();
 			} catch( UnsupportedLookAndFeelException ex ) {
-				ex.printStackTrace();
+				LOG.log( Level.SEVERE, "FlatLaf: Failed to reinitialize look and feel '" + lookAndFeel.getClass().getName() + "'.", ex );
 			}
 		} );
 	}
 
 	/**
-	 * Update UI of all application windows.
+	 * Update UI of all application windows immediately.
 	 * Invoke after changing LaF.
 	 */
 	public static void updateUI() {
@@ -264,60 +516,83 @@ public abstract class FlatLaf
 			SwingUtilities.updateComponentTreeUI( w );
 	}
 
-	public static boolean isShowMnemonics() {
-		return altKeyPressed || !UIManager.getBoolean( "Component.hideMnemonics" );
-	}
+	/**
+	 * Update UI of all application windows later.
+	 */
+	public static void updateUILater() {
+		synchronized( FlatLaf.class ) {
+			if( updateUIPending )
+				return;
 
-	private static void altKeyChanged( boolean pressed ) {
-		if( pressed == altKeyPressed )
-			return;
-
-		altKeyPressed = pressed;
-
-		// check whether it is necessary to repaint
-		if( !UIManager.getBoolean( "Component.hideMnemonics" ) )
-			return;
-
-		// get focus owner
-		Component focusOwner = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner();
-		if( focusOwner == null )
-			return;
-
-		// get focused window
-		Window window = SwingUtilities.windowForComponent( focusOwner );
-		if( window == null )
-			return;
-
-		// repaint components with mnemonics in focused window
-		repaintMnemonics( window );
-	}
-
-	private static void repaintMnemonics( Container container ) {
-		for( Component c : container.getComponents() ) {
-			if( hasMnemonic( c ) )
-				c.repaint();
-
-			if( c instanceof Container )
-				repaintMnemonics( (Container) c );
+			updateUIPending = true;
 		}
-	}
 
-	private static boolean hasMnemonic( Component c ) {
-		if( c instanceof JLabel && ((JLabel)c).getDisplayedMnemonicIndex() >= 0 )
-			return true;
-
-		if( c instanceof AbstractButton && ((AbstractButton)c).getDisplayedMnemonicIndex() >= 0 )
-			return true;
-
-		if( c instanceof JTabbedPane ) {
-			JTabbedPane tabPane = (JTabbedPane) c;
-			int tabCount = tabPane.getTabCount();
-			for( int i = 0; i < tabCount; i++ ) {
-				if( tabPane.getDisplayedMnemonicIndexAt( i ) >= 0 )
-					return true;
+		EventQueue.invokeLater( () -> {
+			updateUI();
+			synchronized( FlatLaf.class ) {
+				updateUIPending = false;
 			}
+		} );
+	}
+
+	public static boolean isShowMnemonics() {
+		return MnemonicHandler.isShowMnemonics();
+	}
+
+	public static void showMnemonics( Component c ) {
+		MnemonicHandler.showMnemonics( true, c );
+	}
+
+	public static void hideMnemonics() {
+		MnemonicHandler.showMnemonics( false, null );
+	}
+
+	//---- class ActiveFont ---------------------------------------------------
+
+	private static class ActiveFont
+		implements ActiveValue
+	{
+		private final float scaleFactor;
+
+		// cache (scaled) font
+		private Font font;
+		private Font lastDefaultFont;
+
+		ActiveFont( float scaleFactor ) {
+			this.scaleFactor = scaleFactor;
 		}
 
-		return false;
+		@Override
+		public Object createValue( UIDefaults table ) {
+			Font defaultFont = UIManager.getFont( "defaultFont" );
+
+			if( lastDefaultFont != defaultFont ) {
+				lastDefaultFont = defaultFont;
+
+				if( scaleFactor != 1 ) {
+					// scale font
+					int newFontSize = Math.round( defaultFont.getSize() * scaleFactor );
+					font = new FontUIResource( defaultFont.deriveFont( (float) newFontSize ) );
+				} else {
+					// make sure that font is a UIResource for LaF switching
+					font = (defaultFont instanceof UIResource)
+						? defaultFont
+						: new FontUIResource( defaultFont );
+				}
+			}
+
+			return font;
+		}
+	}
+
+	//---- class ImageIconUIResource ------------------------------------------
+
+	private static class ImageIconUIResource
+		extends ImageIcon
+		implements UIResource
+	{
+		ImageIconUIResource( Image image ) {
+			super( image );
+		}
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatLightLaf.java

@@ -32,12 +32,12 @@ public class FlatLightLaf
 
 	@Override
 	public String getName() {
-		return "Flat Light";
+		return "FlatLaf Light";
 	}
 
 	@Override
 	public String getDescription() {
-		return "Flat Light Look and Feel";
+		return "FlatLaf Light Look and Feel";
 	}
 
 	@Override

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatPropertiesLaf.java

@@ -0,0 +1,122 @@
+/*
+ * Copyright 2020 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.Properties;
+
+/**
+ * A Flat LaF that is able to load UI defaults from properties passed to the constructor.
+ * <p>
+ * Specify the base theme in the properties with {@code @baseTheme=<baseTheme>}.
+ * Allowed values for {@code <baseTheme>} are {@code light} (the default), {@code dark},
+ * {@code intellij} or {@code darcula}.
+ * <p>
+ * The properties are applied after loading the base theme and may overwrite base properties.
+ * All features of FlatLaf properties files are available.
+ *
+ * @author Karl Tauber
+ */
+public class FlatPropertiesLaf
+	extends FlatLaf
+{
+	private final String name;
+	private final String baseTheme;
+	private final boolean dark;
+	private final Properties properties;
+
+	public FlatPropertiesLaf( String name, File propertiesFile )
+		throws IOException
+	{
+		this( name, new FileInputStream( propertiesFile ) );
+	}
+
+	public FlatPropertiesLaf( String name, InputStream in )
+		throws IOException
+	{
+		this( name, loadProperties( in ) );
+	}
+
+	private static Properties loadProperties( InputStream in )
+		throws IOException
+	{
+		Properties properties = new Properties();
+		try( InputStream in2 = in ) {
+			properties.load( in2 );
+		}
+		return properties;
+	}
+
+	public FlatPropertiesLaf( String name, Properties properties ) {
+		this.name = name;
+		this.properties = properties;
+
+		baseTheme = properties.getProperty( "@baseTheme", "light" );
+		dark = "dark".equalsIgnoreCase( baseTheme ) || "darcula".equalsIgnoreCase( baseTheme );
+	}
+
+	@Override
+	public String getName() {
+		return name;
+	}
+
+	@Override
+	public String getDescription() {
+		return name;
+	}
+
+	@Override
+	public boolean isDark() {
+		return dark;
+	}
+
+	@Override
+	protected ArrayList<Class<?>> getLafClassesForDefaultsLoading() {
+		ArrayList<Class<?>> lafClasses = new ArrayList<>();
+		lafClasses.add( FlatLaf.class );
+		switch( baseTheme.toLowerCase() ) {
+			default:
+			case "light":
+				lafClasses.add( FlatLightLaf.class );
+				break;
+
+			case "dark":
+				lafClasses.add( FlatDarkLaf.class );
+				break;
+
+			case "intellij":
+				lafClasses.add( FlatLightLaf.class );
+				lafClasses.add( FlatIntelliJLaf.class );
+				break;
+
+			case "darcula":
+				lafClasses.add( FlatDarkLaf.class );
+				lafClasses.add( FlatDarculaLaf.class );
+				break;
+		}
+		return lafClasses;
+	}
+
+	@Override
+	protected Properties getAdditionalDefaults() {
+		return properties;
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/IntelliJTheme.java

@@ -0,0 +1,570 @@
+/*
+ * Copyright 2019 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Enumeration;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.logging.Level;
+import javax.swing.UIDefaults;
+import javax.swing.plaf.ColorUIResource;
+import com.formdev.flatlaf.json.Json;
+import com.formdev.flatlaf.json.ParseException;
+import com.formdev.flatlaf.util.StringUtils;
+
+/**
+ * This class supports loading IntelliJ .theme.json files and using them as a Laf.
+ *
+ * .theme.json files are used by Theme plugins for IntelliJ IDEA and other
+ * JetBrains IDEs that are based on IntelliJ platform.
+ *
+ * Here you can find IntelliJ Theme plugins:
+ *   https://plugins.jetbrains.com/search?tags=Theme
+ *
+ * The IntelliJ .theme.json file are documented here:
+ *   http://www.jetbrains.org/intellij/sdk/docs/reference_guide/ui_themes/themes_customize.html
+ *
+ * @author Karl Tauber
+ */
+public class IntelliJTheme
+{
+	public final String name;
+	public final boolean dark;
+	public final String author;
+
+	private final Map<String, String> colors;
+	private final Map<String, Object> ui;
+	private final Map<String, Object> icons;
+
+	private Map<String, ColorUIResource> namedColors = Collections.emptyMap();
+
+	/**
+	 * Loads a IntelliJ .theme.json file from the given input stream,
+	 * creates a Laf instance for it and installs it.
+	 *
+	 * The input stream is automatically closed.
+	 * Using a buffered input stream is not necessary.
+	 */
+	public static boolean install( InputStream in ) {
+		try {
+		    return FlatLaf.install( createLaf( in ) );
+		} catch( Exception ex ) {
+			FlatLaf.LOG.log( Level.SEVERE, "FlatLaf: Failed to load IntelliJ theme", ex );
+		    return false;
+		}
+	}
+
+	/**
+	 * Loads a IntelliJ .theme.json file from the given input stream and
+	 * creates a Laf instance for it.
+	 *
+	 * The input stream is automatically closed.
+	 * Using a buffered input stream is not necessary.
+	 */
+	public static FlatLaf createLaf( InputStream in )
+		throws IOException
+	{
+		return createLaf( new IntelliJTheme( in ) );
+	}
+
+	/**
+	 * Creates a Laf instance for the given IntelliJ theme.
+	 */
+	public static FlatLaf createLaf( IntelliJTheme theme ) {
+		return new ThemeLaf( theme );
+	}
+
+	/**
+	 * Loads a IntelliJ .theme.json file from the given input stream.
+	 *
+	 * The input stream is automatically closed.
+	 * Using a buffered input stream is not necessary.
+	 */
+	@SuppressWarnings( "unchecked" )
+	public IntelliJTheme( InputStream in )
+		throws IOException
+	{
+		Map<String, Object> json;
+	    try( Reader reader = new InputStreamReader( in, StandardCharsets.UTF_8 ) ) {
+	    		json = (Map<String, Object>) Json.parse( reader );
+		} catch( ParseException ex ) {
+			throw new IOException( ex.getMessage(), ex );
+		}
+
+	    name = (String) json.get( "name" );
+	    dark = Boolean.parseBoolean( (String) json.get( "dark" ) );
+	    author = (String) json.get( "author" );
+
+	    colors = (Map<String, String>) json.get( "colors" );
+	    ui = (Map<String, Object>) json.get( "ui" );
+	    icons = (Map<String, Object>) json.get( "icons" );
+	}
+
+	private void applyProperties( UIDefaults defaults ) {
+		if( ui == null )
+			return;
+
+		defaults.put( "Component.isIntelliJTheme", true );
+
+		// enable button shadows
+		defaults.put( "Button.paintShadow", true );
+		defaults.put( "Button.shadowWidth", dark ? 2 : 1 );
+
+		Map<Object, Object> themeSpecificDefaults = removeThemeSpecificDefaults( defaults );
+
+		loadNamedColors( defaults );
+
+		// convert Json "ui" structure to UI defaults
+		ArrayList<Object> defaultsKeysCache = new ArrayList<>();
+		Set<String> uiKeys = new HashSet<>();
+		for( Map.Entry<String, Object> e : ui.entrySet() )
+			apply( e.getKey(), e.getValue(), defaults, defaultsKeysCache, uiKeys );
+
+		applyColorPalette( defaults );
+		applyCheckBoxColors( defaults );
+
+		// IDEA uses a SVG icon for the help button, but paints the background with Button.startBackground and Button.endBackground
+		Object helpButtonBackground = defaults.get( "Button.startBackground" );
+		Object helpButtonBorderColor = defaults.get( "Button.startBorderColor" );
+		if( helpButtonBackground == null )
+			helpButtonBackground = defaults.get( "Button.background" );
+		if( helpButtonBorderColor == null )
+			helpButtonBorderColor = defaults.get( "Button.borderColor" );
+		defaults.put( "HelpButton.background", helpButtonBackground );
+		defaults.put( "HelpButton.borderColor", helpButtonBorderColor );
+		defaults.put( "HelpButton.disabledBackground", defaults.get( "Panel.background" ) );
+		defaults.put( "HelpButton.disabledBorderColor", defaults.get( "Button.disabledBorderColor" ) );
+		defaults.put( "HelpButton.focusedBorderColor", defaults.get( "Button.focusedBorderColor" ) );
+		defaults.put( "HelpButton.focusedBackground", defaults.get( "Button.focusedBackground" ) );
+
+		// IDEA uses TextField.background for editable ComboBox and Spinner
+		defaults.put( "ComboBox.editableBackground", defaults.get( "TextField.background" ) );
+		defaults.put( "Spinner.background", defaults.get( "TextField.background" ) );
+
+		// Spinner arrow button always has same colors as ComboBox arrow button
+		defaults.put( "Spinner.buttonBackground", defaults.get( "ComboBox.buttonEditableBackground" ) );
+		defaults.put( "Spinner.buttonArrowColor", defaults.get( "ComboBox.buttonArrowColor" ) );
+		defaults.put( "Spinner.buttonDisabledArrowColor", defaults.get( "ComboBox.buttonDisabledArrowColor" ) );
+
+		// some themes specify colors for TextField.background, but forget to specify it for other components
+		// (probably because those components are not used in IntelliJ)
+		if( uiKeys.contains( "TextField.background" ) ) {
+			Object textFieldBackground = defaults.get( "TextField.background" );
+			if( !uiKeys.contains( "FormattedTextField.background" ) )
+				defaults.put( "FormattedTextField.background", textFieldBackground );
+			if( !uiKeys.contains( "PasswordField.background" ) )
+				defaults.put( "PasswordField.background", textFieldBackground );
+			if( !uiKeys.contains( "EditorPane.background" ) )
+				defaults.put( "EditorPane.background", textFieldBackground );
+			if( !uiKeys.contains( "TextArea.background" ) )
+				defaults.put( "TextArea.background", textFieldBackground );
+			if( !uiKeys.contains( "TextPane.background" ) )
+				defaults.put( "TextPane.background", textFieldBackground );
+			if( !uiKeys.contains( "Spinner.background" ) )
+				defaults.put( "Spinner.background", textFieldBackground );
+		}
+
+		// fix ToggleButton
+		if( !uiKeys.contains( "ToggleButton.startBackground" ) && !uiKeys.contains( "*.startBackground" ) )
+			defaults.put( "ToggleButton.startBackground", defaults.get( "Button.startBackground" ) );
+		if( !uiKeys.contains( "ToggleButton.endBackground" ) && !uiKeys.contains( "*.endBackground" ) )
+			defaults.put( "ToggleButton.endBackground", defaults.get( "Button.endBackground" ) );
+		if( !uiKeys.contains( "ToggleButton.foreground" ) && uiKeys.contains( "Button.foreground" ) )
+			defaults.put( "ToggleButton.foreground", defaults.get( "Button.foreground" ) );
+
+		// limit tree row height
+		int rowHeight = defaults.getInt( "Tree.rowHeight" );
+		if( rowHeight > 22 )
+			defaults.put( "Tree.rowHeight", 22 );
+
+		// apply theme specific UI defaults at the end to allow overwriting
+		defaults.putAll( themeSpecificDefaults );
+	}
+
+	private Map<Object, Object> removeThemeSpecificDefaults( UIDefaults defaults ) {
+		// search for theme specific UI defaults keys
+		ArrayList<String> themeSpecificKeys = new ArrayList<>();
+		for( Object key : defaults.keySet() ) {
+			if( key instanceof String && ((String)key).startsWith( "[" ) )
+				themeSpecificKeys.add( (String) key );
+		}
+
+		// remove theme specific UI defaults and remember only those for current theme
+		Map<Object, Object> themeSpecificDefaults = new HashMap<>();
+		String currentThemePrefix = '[' + name.replace( ' ', '_' ) + ']';
+		for( String key : themeSpecificKeys ) {
+			Object value = defaults.remove( key );
+			if( key.startsWith( currentThemePrefix ) )
+				themeSpecificDefaults.put( key.substring( currentThemePrefix.length() ), value );
+		}
+
+		return themeSpecificDefaults;
+	}
+
+	/**
+	 * http://www.jetbrains.org/intellij/sdk/docs/reference_guide/ui_themes/themes_customize.html#defining-named-colors
+	 */
+	private void loadNamedColors( UIDefaults defaults ) {
+		if( colors == null )
+			return;
+
+		namedColors = new HashMap<>();
+
+		for( Map.Entry<String, String> e : colors.entrySet() ) {
+			String value = e.getValue();
+			ColorUIResource color = UIDefaultsLoader.parseColor( value );
+			if( color != null ) {
+				String key = e.getKey();
+				namedColors.put( key, color );
+				defaults.put( "ColorPalette." + key, color );
+			}
+		}
+	}
+
+	/**
+	 * http://www.jetbrains.org/intellij/sdk/docs/reference_guide/ui_themes/themes_customize.html#custom-ui-control-colors
+	 */
+	@SuppressWarnings( "unchecked" )
+	private void apply( String key, Object value, UIDefaults defaults, ArrayList<Object> defaultsKeysCache, Set<String> uiKeys ) {
+		if( value instanceof Map ) {
+			for( Map.Entry<String, Object> e : ((Map<String, Object>)value).entrySet() )
+				apply( key + '.' + e.getKey(), e.getValue(), defaults, defaultsKeysCache, uiKeys );
+		} else {
+			uiKeys.add( key );
+
+			// fix ComboBox size and Spinner border in all Material UI Lite themes
+			boolean isMaterialUILite = author.equals( "Mallowigi" );
+			if( isMaterialUILite && (key.equals( "ComboBox.padding" ) || key.equals( "Spinner.border" )) )
+				return; // ignore
+
+			// map keys
+			key = uiKeyMapping.getOrDefault( key, key );
+			if( key.isEmpty() )
+				return; // ignore key
+
+			String valueStr = value.toString();
+
+			// map named colors
+			Object uiValue = namedColors.get( valueStr );
+
+			// parse value
+			if( uiValue == null ) {
+				// fix errors (missing '#' for colors)
+				if( !valueStr.startsWith( "#" ) && (key.endsWith( "ground" ) || key.endsWith( "Color" )) )
+					valueStr = fixColorIfValid( "#" + valueStr, valueStr );
+				else if( valueStr.startsWith( "##" ) )
+					valueStr = fixColorIfValid( valueStr.substring( 1 ), valueStr );
+				else if( key.endsWith( ".border" ) || key.endsWith( "Border" ) ) {
+					List<String> parts = StringUtils.split( valueStr, ',' );
+					if( parts.size() == 5 && !parts.get( 4 ).startsWith( "#" ) ) {
+						parts.set( 4, "#" + parts.get( 4 ) );
+						valueStr = String.join( ",", parts );
+					}
+				}
+
+				// parse value
+				try {
+					uiValue = UIDefaultsLoader.parseValue( key, valueStr );
+				} catch( RuntimeException ex ) {
+					UIDefaultsLoader.logParseError( Level.CONFIG, key, valueStr, ex );
+					return; // ignore invalid value
+				}
+			}
+
+			if( key.startsWith( "*." ) ) {
+				// wildcard
+				String tail = key.substring( 1 );
+
+				// because we can not iterate over the UI defaults keys while
+				// modifying UI defaults in the same loop, we have to copy the keys
+				if( defaultsKeysCache.size() != defaults.size() ) {
+					defaultsKeysCache.clear();
+					Enumeration<Object> e = defaults.keys();
+					while( e.hasMoreElements() )
+						defaultsKeysCache.add( e.nextElement() );
+				}
+
+				// replace all values in UI defaults that match the wildcard key
+				for( Object k : defaultsKeysCache ) {
+					if( k instanceof String ) {
+						// support replacing of mapped keys
+						// (e.g. set ComboBox.buttonEditableBackground to *.background
+						// because it is mapped from ComboBox.ArrowButton.background)
+						String km = uiKeyInverseMapping.getOrDefault( k, (String) k );
+						if( km.endsWith( tail ) && !((String)k).startsWith( "CheckBox.icon." ) )
+							defaults.put( k, uiValue );
+					}
+				}
+			} else
+				defaults.put( key, uiValue );
+		}
+	}
+
+	private String fixColorIfValid( String newColorStr, String colorStr ) {
+		try {
+			// check whether it is valid
+			UIDefaultsLoader.parseColorRGBA( newColorStr );
+
+			return newColorStr;
+		} catch( IllegalArgumentException ex ) {
+			return colorStr;
+		}
+	}
+
+	private void applyColorPalette( UIDefaults defaults ) {
+		if( icons == null )
+			return;
+
+		Object palette = icons.get( "ColorPalette" );
+		if( !(palette instanceof Map) )
+			return;
+
+		@SuppressWarnings( "unchecked" )
+		Map<String, Object> colorPalette = (Map<String, Object>) palette;
+		for( Map.Entry<String, Object> e : colorPalette.entrySet() ) {
+			String key = e.getKey();
+			Object value = e.getValue();
+			if( key.startsWith( "Checkbox." ) || !(value instanceof String) )
+				continue;
+
+			if( dark )
+				key = StringUtils.removeTrailing( key, ".Dark" );
+
+			ColorUIResource color = toColor( (String) value );
+			if( color != null )
+				defaults.put( key, color );
+		}
+	}
+
+	private ColorUIResource toColor( String value ) {
+		// map named colors
+		ColorUIResource color = namedColors.get( value );
+
+		// parse color
+		return (color != null) ? color : UIDefaultsLoader.parseColor( value );
+	}
+
+	/**
+	 * Because IDEA uses SVGs for check boxes and radio buttons the colors for
+	 * this two components are specified in "icons > ColorPalette".
+	 * FlatLaf uses vector icons and expects colors for the two components in UI defaults.
+	 */
+	private void applyCheckBoxColors( UIDefaults defaults ) {
+		if( icons == null )
+			return;
+
+		Object palette = icons.get( "ColorPalette" );
+		if( !(palette instanceof Map) )
+			return;
+
+		boolean checkboxModified = false;
+		@SuppressWarnings( "unchecked" )
+		Map<String, Object> colorPalette = (Map<String, Object>) palette;
+		for( Map.Entry<String, Object> e : colorPalette.entrySet() ) {
+			String key = e.getKey();
+			Object value = e.getValue();
+			if( !key.startsWith( "Checkbox." ) || !(value instanceof String) )
+				continue;
+
+			if( key.equals( "Checkbox.Background.Default" ) ||
+				key.equals( "Checkbox.Foreground.Selected" ) )
+			{
+				// This two keys do not work correctly in IDEA because they
+				// map SVG color "#ffffff" to another color, but checkBox.svg and
+				// radio.svg (in package com.intellij.ide.ui.laf.icons.intellij)
+				// use "#fff". So use white to get same appearance as in IDEA.
+				value = "#ffffff";
+			}
+
+			String key2 = checkboxDuplicateColors.get( key );
+
+			if( dark )
+				key = StringUtils.removeTrailing( key, ".Dark" );
+
+			String newKey = checkboxKeyMapping.get( key );
+			if( newKey != null ) {
+				ColorUIResource color = toColor( (String) value );
+				if( color != null ) {
+					defaults.put( newKey, color );
+
+					if( key2 != null ) {
+						// When IDEA replaces colors in SVGs it uses color values and not the keys
+						// from com.intellij.ide.ui.UITheme.colorPalette, but there are some keys that
+						// have same color value:
+						//   - Checkbox.Background.Default.Dark  has same color as  Checkbox.Background.Selected.Dark
+						//   - Checkbox.Border.Default.Dark      has same color as  Checkbox.Border.Selected.Dark
+						//   - Checkbox.Focus.Thin.Default.Dark  has same color as  Checkbox.Focus.Thin.Selected.Dark
+						//
+						// So if only e.g. Checkbox.Background.Default.Dark is specified in .theme.json,
+						// then this color is also used for Checkbox.Background.Selected.Dark.
+						//
+						// If Checkbox.Background.Default.Dark and Checkbox.Background.Selected.Dark
+						// are specified in .theme.json, then the later specified is used for both.
+						if( dark )
+							key2 = StringUtils.removeTrailing( key2, ".Dark" );
+
+						String newKey2 = checkboxKeyMapping.get( key2 );
+						if( newKey2 != null )
+							defaults.put( newKey2, color );
+					}
+				}
+
+				checkboxModified = true;
+			}
+		}
+
+		// remove hover and pressed colors
+		if( checkboxModified ) {
+			defaults.remove( "CheckBox.icon.hoverBorderColor" );
+			defaults.remove( "CheckBox.icon.focusedBackground" );
+			defaults.remove( "CheckBox.icon.hoverBackground" );
+			defaults.remove( "CheckBox.icon.pressedBackground" );
+			defaults.remove( "CheckBox.icon.selectedHoverBackground" );
+			defaults.remove( "CheckBox.icon.selectedPressedBackground" );
+		}
+
+		// copy values
+		for( Map.Entry<String, String> e : uiKeyCopying.entrySet() )
+			defaults.put( e.getKey(), defaults.get( e.getValue() ) );
+	}
+
+	private static Map<String, String> uiKeyMapping = new HashMap<>();
+	private static Map<String, String> uiKeyCopying = new HashMap<>();
+	private static Map<String, String> uiKeyInverseMapping = new HashMap<>();
+	private static Map<String, String> checkboxKeyMapping = new HashMap<>();
+	private static Map<String, String> checkboxDuplicateColors = new HashMap<>();
+
+	static {
+		// ComboBox
+		uiKeyMapping.put( "ComboBox.background",                        "" ); // ignore
+		uiKeyMapping.put( "ComboBox.nonEditableBackground",             "ComboBox.background" );
+		uiKeyMapping.put( "ComboBox.ArrowButton.background",            "ComboBox.buttonEditableBackground" );
+		uiKeyMapping.put( "ComboBox.ArrowButton.disabledIconColor",     "ComboBox.buttonDisabledArrowColor" );
+		uiKeyMapping.put( "ComboBox.ArrowButton.iconColor",             "ComboBox.buttonArrowColor" );
+		uiKeyMapping.put( "ComboBox.ArrowButton.nonEditableBackground", "ComboBox.buttonBackground" );
+
+		// Component
+		uiKeyMapping.put( "Component.inactiveErrorFocusColor",   "Component.error.borderColor" );
+		uiKeyMapping.put( "Component.errorFocusColor",           "Component.error.focusedBorderColor" );
+		uiKeyMapping.put( "Component.inactiveWarningFocusColor", "Component.warning.borderColor" );
+		uiKeyMapping.put( "Component.warningFocusColor",         "Component.warning.focusedBorderColor" );
+
+		// Link
+		uiKeyMapping.put( "Link.activeForeground", "Component.linkColor" );
+
+		// ProgressBar
+		uiKeyMapping.put( "ProgressBar.background",    "" ); // ignore
+		uiKeyMapping.put( "ProgressBar.foreground",    "" ); // ignore
+		uiKeyMapping.put( "ProgressBar.trackColor",    "ProgressBar.background" );
+		uiKeyMapping.put( "ProgressBar.progressColor", "ProgressBar.foreground" );
+
+		// ScrollBar
+		uiKeyMapping.put( "ScrollBar.trackColor", "ScrollBar.track" );
+		uiKeyMapping.put( "ScrollBar.thumbColor", "ScrollBar.thumb" );
+
+		// Separator
+		uiKeyMapping.put( "Separator.separatorColor", "Separator.foreground" );
+
+		// Slider
+		uiKeyMapping.put( "Slider.trackWidth", "" ); // ignore (used in Material Theme UI Lite)
+
+		for( Map.Entry<String, String> e : uiKeyMapping.entrySet() )
+			uiKeyInverseMapping.put( e.getValue(), e.getKey() );
+
+		uiKeyCopying.put( "ToggleButton.tab.underlineColor",         "TabbedPane.underlineColor" );
+		uiKeyCopying.put( "ToggleButton.tab.disabledUnderlineColor", "TabbedPane.disabledUnderlineColor" );
+		uiKeyCopying.put( "ToggleButton.tab.selectedBackground",     "TabbedPane.selectedBackground" );
+		uiKeyCopying.put( "ToggleButton.tab.hoverBackground",        "TabbedPane.hoverColor" );
+		uiKeyCopying.put( "ToggleButton.tab.focusBackground",        "TabbedPane.focusColor" );
+
+		checkboxKeyMapping.put( "Checkbox.Background.Default",  "CheckBox.icon.background" );
+		checkboxKeyMapping.put( "Checkbox.Background.Disabled", "CheckBox.icon.disabledBackground" );
+		checkboxKeyMapping.put( "Checkbox.Border.Default",      "CheckBox.icon.borderColor" );
+		checkboxKeyMapping.put( "Checkbox.Border.Disabled",     "CheckBox.icon.disabledBorderColor" );
+		checkboxKeyMapping.put( "Checkbox.Focus.Thin.Default",  "CheckBox.icon.focusedBorderColor" );
+		checkboxKeyMapping.put( "Checkbox.Focus.Wide",          "CheckBox.icon.focusedColor" );
+		checkboxKeyMapping.put( "Checkbox.Foreground.Disabled", "CheckBox.icon.disabledCheckmarkColor" );
+		checkboxKeyMapping.put( "Checkbox.Background.Selected", "CheckBox.icon.selectedBackground" );
+		checkboxKeyMapping.put( "Checkbox.Border.Selected",     "CheckBox.icon.selectedBorderColor" );
+		checkboxKeyMapping.put( "Checkbox.Foreground.Selected", "CheckBox.icon.checkmarkColor" );
+		checkboxKeyMapping.put( "Checkbox.Focus.Thin.Selected", "CheckBox.icon.selectedFocusedBorderColor" );
+
+		checkboxDuplicateColors.put( "Checkbox.Background.Default.Dark", "Checkbox.Background.Selected.Dark" );
+		checkboxDuplicateColors.put( "Checkbox.Border.Default.Dark",     "Checkbox.Border.Selected.Dark" );
+		checkboxDuplicateColors.put( "Checkbox.Focus.Thin.Default.Dark", "Checkbox.Focus.Thin.Selected.Dark" );
+		@SuppressWarnings( "unchecked" )
+		Map.Entry<String, String>[] entries = checkboxDuplicateColors.entrySet().toArray( new Map.Entry[checkboxDuplicateColors.size()] );
+		for( Map.Entry<String, String> e : entries )
+			checkboxDuplicateColors.put( e.getValue(), e.getKey() );
+	}
+
+	//---- class ThemeLaf -----------------------------------------------------
+
+	public static class ThemeLaf
+		extends FlatLaf
+	{
+		private final IntelliJTheme theme;
+
+		public ThemeLaf( IntelliJTheme theme ) {
+			this.theme = theme;
+		}
+
+		@Override
+		public String getName() {
+			return theme.name;
+		}
+
+		@Override
+		public String getDescription() {
+			return theme.name;
+		}
+
+		@Override
+		public boolean isDark() {
+			return theme.dark;
+		}
+
+		public IntelliJTheme getTheme() {
+			return theme;
+		}
+
+		@Override
+		void applyAdditionalDefaults( UIDefaults defaults ) {
+			theme.applyProperties( defaults );
+		}
+
+		@Override
+		protected ArrayList<Class<?>> getLafClassesForDefaultsLoading() {
+			ArrayList<Class<?>> lafClasses = new ArrayList<>();
+			lafClasses.add( FlatLaf.class );
+			lafClasses.add( theme.dark ? FlatDarkLaf.class : FlatLightLaf.class );
+			lafClasses.add( theme.dark ? FlatDarculaLaf.class : FlatIntelliJLaf.class );
+			lafClasses.add( ThemeLaf.class );
+			return lafClasses;
+		}
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/LinuxFontPolicy.java

@@ -17,6 +17,7 @@
 package com.formdev.flatlaf;
 
 import java.awt.Font;
+import java.awt.GraphicsConfiguration;
 import java.awt.GraphicsEnvironment;
 import java.awt.Toolkit;
 import java.io.BufferedReader;
@@ -27,8 +28,10 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 import java.util.StringTokenizer;
-import javax.swing.text.StyleContext;
+import java.util.logging.Level;
+import com.formdev.flatlaf.util.StringUtils;
 import com.formdev.flatlaf.util.SystemInfo;
+import com.formdev.flatlaf.util.UIScale;
 
 /**
  * @author Karl Tauber
@@ -71,6 +74,13 @@ class LinuxFontPolicy
 				family = family.isEmpty() ? word : (family + ' ' + word);
 		}
 
+		// Ubuntu font is rendered poorly (except if running in JetBrains VM)
+		// --> use Liberation Sans font
+		if( family.startsWith( "Ubuntu" ) &&
+			!SystemInfo.IS_JETBRAINS_JVM &&
+			!Boolean.parseBoolean( System.getProperty( "flatlaf.useUbuntuFont" ) ) )
+		  family = "Liberation Sans";
+
 		// scale font size
 		double dsize = size * getGnomeFontScale();
 		size = (int) (dsize + 0.5);
@@ -86,9 +96,7 @@ class LinuxFontPolicy
 	}
 
 	private static Font createFont( String family, int style, int size, double dsize ) {
-		// using StyleContext.getFont() here because it uses
-		// sun.font.FontUtilities.getCompositeFontUIResource()
-		Font font = new StyleContext().getFont( family, style, size );
+		Font font = FlatLaf.createCompositeFont( family, style, size );
 
 		// set font size in floating points
 		font = font.deriveFont( style, (float) dsize );
@@ -97,6 +105,10 @@ class LinuxFontPolicy
 	}
 
 	private static double getGnomeFontScale() {
+		// do not scale font here if JRE scales
+		if( isSystemScaling() )
+			return 96. / 72.;
+
 		// see class com.sun.java.swing.plaf.gtk.PangoFonts background information
 
 		Object value = Toolkit.getDefaultToolkit().getDesktopProperty( "gnome.Xft/DPI" );
@@ -151,7 +163,7 @@ class LinuxFontPolicy
 		int size = 10;
 
 		if( generalFont != null ) {
-			List<String> strs = FlatLaf.split( generalFont, ',' );
+			List<String> strs = StringUtils.split( generalFont, ',' );
 			try {
 				family = strs.get( 0 );
 				size = Integer.parseInt( strs.get( 1 ) );
@@ -160,13 +172,13 @@ class LinuxFontPolicy
 				if( "1".equals( strs.get( 5 ) ) )
 					style |= Font.ITALIC;
 			} catch( RuntimeException ex ) {
-				ex.printStackTrace();
+				FlatLaf.LOG.log( Level.CONFIG, "FlatLaf: Failed to parse 'font=" + generalFont + "'.", ex );
 			}
 		}
 
 		// font dpi
 		int dpi = 96;
-		if( forceFontDPI != null ) {
+		if( forceFontDPI != null && !isSystemScaling() ) {
 			try {
 				dpi = Integer.parseInt( forceFontDPI );
 				if( dpi <= 0 )
@@ -174,7 +186,7 @@ class LinuxFontPolicy
 				if( dpi < 50 )
 					dpi = 50;
 			} catch( NumberFormatException ex ) {
-				ex.printStackTrace();
+				FlatLaf.LOG.log( Level.CONFIG, "FlatLaf: Failed to parse 'forceFontDPI=" + forceFontDPI + "'.", ex );
 			}
 		}
 
@@ -213,7 +225,7 @@ class LinuxFontPolicy
 			while( (line = reader.readLine()) != null )
 				lines.add( line );
 		} catch( IOException ex ) {
-			ex.printStackTrace();
+			FlatLaf.LOG.log( Level.CONFIG, "FlatLaf: Failed to read '" + filename + "'.", ex );
 		}
 		return lines;
 	}
@@ -245,4 +257,15 @@ class LinuxFontPolicy
 		}
 		return null;
 	}
+
+	/**
+	 * Returns true if the JRE scales, which is the case if:
+	 *   - environment variable GDK_SCALE is set and running on Java 9 or later
+	 *   - running on JetBrains Runtime 11 or later and scaling is enabled in system Settings
+	 */
+	private static boolean isSystemScaling() {
+		GraphicsConfiguration gc = GraphicsEnvironment.getLocalGraphicsEnvironment()
+			.getDefaultScreenDevice().getDefaultConfiguration();
+		return UIScale.getSystemScaleFactor( gc ) > 1;
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/MnemonicHandler.java

@@ -0,0 +1,259 @@
+/*
+ * Copyright 2020 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf;
+
+import java.awt.Component;
+import java.awt.Container;
+import java.awt.EventQueue;
+import java.awt.KeyEventPostProcessor;
+import java.awt.KeyboardFocusManager;
+import java.awt.Window;
+import java.awt.event.KeyEvent;
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
+import java.awt.event.WindowListener;
+import java.lang.ref.WeakReference;
+import javax.swing.AbstractButton;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JMenu;
+import javax.swing.JMenuBar;
+import javax.swing.JRootPane;
+import javax.swing.JTabbedPane;
+import javax.swing.MenuElement;
+import javax.swing.MenuSelectionManager;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+import javax.swing.event.ChangeEvent;
+import javax.swing.event.ChangeListener;
+import com.formdev.flatlaf.util.SystemInfo;
+
+/**
+ * Show/hide mnemonics.
+ *
+ * @author Karl Tauber
+ */
+class MnemonicHandler
+	implements KeyEventPostProcessor, ChangeListener
+{
+	private static boolean showMnemonics;
+	private static WeakReference<Window> lastShowMnemonicWindow;
+	private static WindowListener windowListener;
+
+	static boolean isShowMnemonics() {
+		return showMnemonics || !UIManager.getBoolean( "Component.hideMnemonics" );
+	}
+
+	void install() {
+		KeyboardFocusManager.getCurrentKeyboardFocusManager().addKeyEventPostProcessor( this );
+		MenuSelectionManager.defaultManager().addChangeListener( this );
+	}
+
+	void uninstall() {
+		KeyboardFocusManager.getCurrentKeyboardFocusManager().removeKeyEventPostProcessor( this );
+		MenuSelectionManager.defaultManager().removeChangeListener( this );
+	}
+
+	@Override
+	public boolean postProcessKeyEvent( KeyEvent e ) {
+		int keyCode = e.getKeyCode();
+		if( SystemInfo.IS_MAC ) {
+			// Ctrl+Alt keys must be pressed on Mac
+			if( keyCode == KeyEvent.VK_CONTROL || keyCode == KeyEvent.VK_ALT )
+				showMnemonics( shouldShowMnemonics( e ) && e.isControlDown() && e.isAltDown(), e.getComponent() );
+		} else {
+			// Alt key must be pressed on Windows and Linux
+			if( SystemInfo.IS_WINDOWS )
+				return processKeyEventOnWindows( e );
+
+			if( keyCode == KeyEvent.VK_ALT )
+				showMnemonics( shouldShowMnemonics( e ), e.getComponent() );
+		}
+
+		return false;
+	}
+
+	private boolean shouldShowMnemonics( KeyEvent e ) {
+		return e.getID() == KeyEvent.KEY_PRESSED ||
+			MenuSelectionManager.defaultManager().getSelectedPath().length > 0;
+	}
+
+	private static int altPressedEventCount;
+	private static boolean selectMenuOnAltReleased;
+
+	/**
+	 * Special Alt key behavior on Windows.
+	 *
+	 * Press-and-release Alt key selects first menu (if available) and moves focus
+	 * temporary to menu bar. If menu bar has focus (some menu is selected),
+	 * pressing Alt key unselects menu and moves focus back to permanent focus owner.
+	 */
+	private boolean processKeyEventOnWindows( KeyEvent e ) {
+		if( e.getKeyCode() != KeyEvent.VK_ALT ) {
+			selectMenuOnAltReleased = false;
+			return false;
+		}
+
+		if( e.getID() == KeyEvent.KEY_PRESSED ) {
+			altPressedEventCount++;
+
+			if( altPressedEventCount == 1 && !e.isConsumed() ) {
+				MenuSelectionManager menuSelectionManager = MenuSelectionManager.defaultManager();
+				selectMenuOnAltReleased = (menuSelectionManager.getSelectedPath().length == 0);
+
+				// if menu is selected when Alt key is pressed then clear menu selection
+				if( !selectMenuOnAltReleased )
+					menuSelectionManager.clearSelectedPath();
+			}
+
+			// show mnemonics
+			showMnemonics( shouldShowMnemonics( e ), e.getComponent() );
+
+			// avoid that the system menu of the window gets focus
+			e.consume();
+			return true;
+
+		} else if( e.getID() == KeyEvent.KEY_RELEASED ) {
+			altPressedEventCount = 0;
+
+			boolean mnemonicsShown = false;
+			if( selectMenuOnAltReleased && !e.isConsumed() ) {
+				MenuSelectionManager menuSelectionManager = MenuSelectionManager.defaultManager();
+				if( menuSelectionManager.getSelectedPath().length == 0 ) {
+					// get menu bar and first menu
+					Component c = e.getComponent();
+					JRootPane rootPane = SwingUtilities.getRootPane( c );
+					Window window = (rootPane != null) ? SwingUtilities.getWindowAncestor( rootPane ) : null;
+					JMenuBar menuBar = (rootPane != null) ? rootPane.getJMenuBar() : null;
+					if( menuBar == null && window instanceof JFrame )
+						menuBar = ((JFrame)window).getJMenuBar();
+					JMenu firstMenu = (menuBar != null) ? menuBar.getMenu( 0 ) : null;
+
+					// select first menu and show mnemonics
+					if( firstMenu != null ) {
+						menuSelectionManager.setSelectedPath( new MenuElement[] { menuBar, firstMenu } );
+						showMnemonics( true, c );
+						mnemonicsShown = true;
+					}
+				}
+			}
+			selectMenuOnAltReleased = false;
+
+			// hide mnemonics
+			if( !mnemonicsShown )
+				showMnemonics( shouldShowMnemonics( e ), e.getComponent() );
+		}
+		return false;
+	}
+
+	@Override
+	public void stateChanged( ChangeEvent e ) {
+		MenuElement[] selectedPath = MenuSelectionManager.defaultManager().getSelectedPath();
+		if( selectedPath.length == 0 && altPressedEventCount == 0 ) {
+			// hide mnemonics when menu selection was canceled
+			showMnemonics( false, null );
+		}
+	}
+
+	static void showMnemonics( boolean show, Component c ) {
+		if( show == showMnemonics )
+			return;
+
+		showMnemonics = show;
+
+		// check whether it is necessary to repaint
+		if( !UIManager.getBoolean( "Component.hideMnemonics" ) )
+			return;
+
+		if( show ) {
+			// get root pane
+			JRootPane rootPane = SwingUtilities.getRootPane( c );
+			if( rootPane == null )
+				return;
+
+			// get window
+			Window window = SwingUtilities.getWindowAncestor( rootPane );
+			if( window == null )
+				return;
+
+			// repaint components with mnemonics in focused window
+			repaintMnemonics( window );
+
+			// hide mnemonics if window is deactivated (e.g. Alt+Tab to another window)
+			windowListener = new WindowAdapter() {
+				@Override
+				public void windowDeactivated( WindowEvent e ) {
+					altPressedEventCount = 0;
+					selectMenuOnAltReleased = false;
+
+					// use invokeLater() to avoid that the listener is removed
+					// while the listener queue is iterated to fire this event
+					EventQueue.invokeLater( () -> {
+						showMnemonics( false, null );
+					} );
+				}
+			};
+			window.addWindowListener( windowListener );
+
+			lastShowMnemonicWindow = new WeakReference<>( window );
+		} else if( lastShowMnemonicWindow != null ) {
+			Window window = lastShowMnemonicWindow.get();
+			if( window != null ) {
+				repaintMnemonics( window );
+
+				if( windowListener != null ) {
+					window.removeWindowListener( windowListener );
+					windowListener = null;
+				}
+			}
+
+			lastShowMnemonicWindow = null;
+		}
+	}
+
+	private static void repaintMnemonics( Container container ) {
+		for( Component c : container.getComponents() ) {
+			if( !c.isVisible() )
+				continue;
+
+			if( hasMnemonic( c ) )
+				c.repaint();
+
+			if( c instanceof Container )
+				repaintMnemonics( (Container) c );
+		}
+	}
+
+	private static boolean hasMnemonic( Component c ) {
+		if( c instanceof JLabel && ((JLabel)c).getDisplayedMnemonicIndex() >= 0 )
+			return true;
+
+		if( c instanceof AbstractButton && ((AbstractButton)c).getDisplayedMnemonicIndex() >= 0 )
+			return true;
+
+		if( c instanceof JTabbedPane ) {
+			JTabbedPane tabPane = (JTabbedPane) c;
+			int tabCount = tabPane.getTabCount();
+			for( int i = 0; i < tabCount; i++ ) {
+				if( tabPane.getDisplayedMnemonicIndexAt( i ) >= 0 )
+					return true;
+			}
+		}
+
+		return false;
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/UIDefaultsLoader.java

@@ -22,14 +22,17 @@ import java.awt.Insets;
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
 import java.util.Properties;
-import java.util.ServiceLoader;
 import java.util.function.Function;
+import java.util.logging.Level;
 import javax.swing.UIDefaults;
+import javax.swing.UIManager;
+import javax.swing.UIDefaults.ActiveValue;
 import javax.swing.UIDefaults.LazyValue;
 import javax.swing.plaf.ColorUIResource;
 import javax.swing.plaf.DimensionUIResource;
@@ -37,8 +40,13 @@ import javax.swing.plaf.InsetsUIResource;
 import com.formdev.flatlaf.ui.FlatEmptyBorder;
 import com.formdev.flatlaf.ui.FlatLineBorder;
 import com.formdev.flatlaf.util.ColorFunctions;
+import com.formdev.flatlaf.util.ColorFunctions.ColorFunction;
 import com.formdev.flatlaf.util.DerivedColor;
-import com.formdev.flatlaf.util.ScaledNumber;
+import com.formdev.flatlaf.util.GrayFilter;
+import com.formdev.flatlaf.util.HSLColor;
+import com.formdev.flatlaf.util.StringUtils;
+import com.formdev.flatlaf.util.SystemInfo;
+import com.formdev.flatlaf.util.UIScale;
 
 /**
  * Load UI defaults from properties files associated to Flat LaF classes and add to UI defaults.
@@ -56,11 +64,13 @@ class UIDefaultsLoader
 	private static final String TYPE_PREFIX = "{";
 	private static final String TYPE_PREFIX_END = "}";
 	private static final String VARIABLE_PREFIX = "@";
-	private static final String REF_PREFIX = VARIABLE_PREFIX + "@";
+	private static final String PROPERTY_PREFIX = "$";
 	private static final String OPTIONAL_PREFIX = "?";
 	private static final String GLOBAL_PREFIX = "*.";
 
-	static void loadDefaultsFromProperties( Class<?> lookAndFeelClass, UIDefaults defaults ) {
+	static void loadDefaultsFromProperties( Class<?> lookAndFeelClass, List<FlatDefaultsAddon> addons,
+		Properties additionalDefaults, boolean dark, UIDefaults defaults )
+	{
 		// determine classes in class hierarchy in reverse order
 		ArrayList<Class<?>> lafClasses = new ArrayList<>();
 		for( Class<?> lafClass = lookAndFeelClass;
@@ -70,20 +80,26 @@ class UIDefaultsLoader
 			lafClasses.add( 0, lafClass );
 		}
 
+		loadDefaultsFromProperties( lafClasses, addons, additionalDefaults, dark, defaults );
+	}
+
+	static void loadDefaultsFromProperties( List<Class<?>> lafClasses, List<FlatDefaultsAddon> addons,
+		Properties additionalDefaults, boolean dark, UIDefaults defaults )
+	{
 		try {
-			// load properties files
+			// load core properties files
 			Properties properties = new Properties();
-			ServiceLoader<FlatDefaultsAddon> addonLoader = ServiceLoader.load( FlatDefaultsAddon.class );
 			for( Class<?> lafClass : lafClasses ) {
-				// load core properties
-				String propertiesName = "/" + lafClass.getName().replace( '.', '/' ) + ".properties";
+				String propertiesName = '/' + lafClass.getName().replace( '.', '/' ) + ".properties";
 				try( InputStream in = lafClass.getResourceAsStream( propertiesName ) ) {
 					if( in != null )
 						properties.load( in );
 				}
+			}
 
-				// load properties from addons
-				for( FlatDefaultsAddon addon : addonLoader ) {
+			// load properties from addons
+			for( FlatDefaultsAddon addon : addons ) {
+				for( Class<?> lafClass : lafClasses ) {
 					try( InputStream in = addon.getDefaults( lafClass ) ) {
 						if( in != null )
 							properties.load( in );
@@ -91,6 +107,53 @@ class UIDefaultsLoader
 				}
 			}
 
+			// collect addon class loaders
+			List<ClassLoader> addonClassLoaders = new ArrayList<>();
+			for( FlatDefaultsAddon addon : addons ) {
+				ClassLoader addonClassLoader = addon.getClass().getClassLoader();
+				if( !addonClassLoaders.contains( addonClassLoader ) )
+					addonClassLoaders.add( addonClassLoader );
+			}
+
+			// add additional defaults
+			if( additionalDefaults != null )
+				properties.putAll( additionalDefaults );
+
+			// collect all platform specific keys (but do not modify properties)
+			ArrayList<String> platformSpecificKeys = new ArrayList<>();
+			for( Object okey : properties.keySet() ) {
+				String key = (String) okey;
+				if( key.startsWith( "[" ) &&
+					(key.startsWith( "[win]" ) ||
+					 key.startsWith( "[mac]" ) ||
+					 key.startsWith( "[linux]" ) ||
+					 key.startsWith( "[light]" ) ||
+					 key.startsWith( "[dark]" )) )
+				  platformSpecificKeys.add( key );
+			}
+
+			// remove platform specific properties and re-add only properties
+			// for current platform, but with platform prefix removed
+			if( !platformSpecificKeys.isEmpty() ) {
+				// handle light/dark specific properties
+				String lightOrDarkPrefix = dark ? "[dark]" : "[light]";
+				for( String key : platformSpecificKeys ) {
+					if( key.startsWith( lightOrDarkPrefix ) )
+						properties.put( key.substring( lightOrDarkPrefix.length() ), properties.remove( key ) );
+				}
+
+				// handle platform specific properties
+				String platformPrefix =
+					SystemInfo.IS_WINDOWS ? "[win]" :
+					SystemInfo.IS_MAC ? "[mac]" :
+					SystemInfo.IS_LINUX ? "[linux]" : "[unknown]";
+				for( String key : platformSpecificKeys ) {
+					Object value = properties.remove( key );
+					if( key.startsWith( platformPrefix ) )
+						properties.put( key.substring( platformPrefix.length() ), value );
+				}
+			}
+
 			Function<String, String> resolver = value -> {
 				return resolveValue( properties, value );
 			};
@@ -104,9 +167,9 @@ class UIDefaultsLoader
 
 				String value = resolveValue( properties, (String) e.getValue() );
 				try {
-					globals.put( key.substring( GLOBAL_PREFIX.length() ), parseValue( key, value, resolver ) );
+					globals.put( key.substring( GLOBAL_PREFIX.length() ), parseValue( key, value, resolver, addonClassLoaders ) );
 				} catch( RuntimeException ex ) {
-					logParseError( key, value, ex );
+					logParseError( Level.SEVERE, key, value, ex );
 				}
 			}
 
@@ -129,28 +192,26 @@ class UIDefaultsLoader
 
 				String value = resolveValue( properties, (String) e.getValue() );
 				try {
-					defaults.put( key, parseValue( key, value, resolver ) );
+					defaults.put( key, parseValue( key, value, resolver, addonClassLoaders ) );
 				} catch( RuntimeException ex ) {
-					logParseError( key, value, ex );
+					logParseError( Level.SEVERE, key, value, ex );
 				}
 			}
 		} catch( IOException ex ) {
-			ex.printStackTrace();
+			FlatLaf.LOG.log( Level.SEVERE, "FlatLaf: Failed to load properties files.", ex );
 		}
 	}
 
-	private static void logParseError( String key, String value, RuntimeException ex ) {
-		System.err.println( "Failed to parse: '" + key + '=' + value + '\'' );
-		System.err.println( "    " + ex.getMessage() );
+	static void logParseError( Level level, String key, String value, RuntimeException ex ) {
+		FlatLaf.LOG.log( level, "FlatLaf: Failed to parse: '" + key + '=' + value + '\'', ex );
 	}
 
 	private static String resolveValue( Properties properties, String value ) {
-		if( !value.startsWith( VARIABLE_PREFIX ) )
+		if( value.startsWith( PROPERTY_PREFIX ) )
+			value = value.substring( PROPERTY_PREFIX.length() );
+		else if( !value.startsWith( VARIABLE_PREFIX ) )
 			return value;
 
-		if( value.startsWith( REF_PREFIX ) )
-			value = value.substring( REF_PREFIX.length() );
-
 		boolean optional = false;
 		if( value.startsWith( OPTIONAL_PREFIX ) ) {
 			value = value.substring( OPTIONAL_PREFIX.length() );
@@ -162,15 +223,20 @@ class UIDefaultsLoader
 			if( optional )
 				return "null";
 
-			throw new IllegalArgumentException( "variable or reference '" + value + "' not found" );
+			throw new IllegalArgumentException( "variable or property '" + value + "' not found" );
 		}
 
 		return resolveValue( properties, newValue );
 	}
 
-	private enum ValueType { UNKNOWN, STRING, INTEGER, BORDER, ICON, INSETS, SIZE, COLOR, SCALEDNUMBER }
+	private enum ValueType { UNKNOWN, STRING, CHARACTER, INTEGER, FLOAT, BORDER, ICON, INSETS, DIMENSION, COLOR,
+		SCALEDINTEGER, SCALEDFLOAT, SCALEDINSETS, SCALEDDIMENSION, INSTANCE, CLASS, GRAYFILTER }
 
-	private static Object parseValue( String key, String value, Function<String, String> resolver ) {
+	static Object parseValue( String key, String value ) {
+		return parseValue( key, value, v -> v, Collections.emptyList() );
+	}
+
+	private static Object parseValue( String key, String value, Function<String, String> resolver, List<ClassLoader> addonClassLoaders ) {
 		value = value.trim();
 
 		// null, false, true
@@ -180,10 +246,24 @@ class UIDefaultsLoader
 			case "true":	return true;
 		}
 
+		// check for function "lazy"
+		//     Syntax: lazy(uiKey)
+		if( value.startsWith( "lazy(" ) && value.endsWith( ")" ) ) {
+			String uiKey = value.substring( 5, value.length() - 1 ).trim();
+			return (LazyValue) t -> {
+				return lazyUIManagerGet( uiKey );
+			};
+		}
+
 		ValueType valueType = ValueType.UNKNOWN;
 
 		// check whether value type is specified in the value
-		if( value.startsWith( TYPE_PREFIX ) ) {
+		if( value.startsWith( "#" ) )
+			valueType = ValueType.COLOR;
+		else if( value.startsWith( "\"" ) && value.endsWith( "\"" ) ) {
+			valueType = ValueType.STRING;
+			value = value.substring( 1, value.length() - 1 );
+		} else if( value.startsWith( TYPE_PREFIX ) ) {
 			int end = value.indexOf( TYPE_PREFIX_END );
 			if( end != -1 ) {
 				try {
@@ -200,7 +280,9 @@ class UIDefaultsLoader
 
 		// determine value type from key
 		if( valueType == ValueType.UNKNOWN ) {
-			if( key.endsWith( ".border" ) || key.endsWith( "Border" ) )
+			if( key.endsWith( "ground" ) || key.endsWith( "Color" ) )
+				valueType = ValueType.COLOR;
+			else if( key.endsWith( ".border" ) || key.endsWith( "Border" ) )
 				valueType = ValueType.BORDER;
 			else if( key.endsWith( ".icon" ) || key.endsWith( "Icon" ) )
 				valueType = ValueType.ICON;
@@ -208,25 +290,39 @@ class UIDefaultsLoader
 					 key.endsWith( "Margins" ) || key.endsWith( "Insets" ) )
 				valueType = ValueType.INSETS;
 			else if( key.endsWith( "Size" ) )
-				valueType = ValueType.SIZE;
+				valueType = ValueType.DIMENSION;
 			else if( key.endsWith( "Width" ) || key.endsWith( "Height" ) )
 				valueType = ValueType.INTEGER;
+			else if( key.endsWith( "Char" ) )
+				valueType = ValueType.CHARACTER;
+			else if( key.endsWith( "UI" ) )
+				valueType = ValueType.STRING;
+			else if( key.endsWith( "grayFilter" ) )
+				valueType = ValueType.GRAYFILTER;
 		}
 
 		// parse value
 		switch( valueType ) {
 			case STRING:		return value;
+			case CHARACTER:		return parseCharacter( value );
 			case INTEGER:		return parseInteger( value, true );
-			case BORDER:		return parseBorder( value, resolver );
-			case ICON:			return parseInstance( value );
+			case FLOAT:			return parseFloat( value, true );
+			case BORDER:		return parseBorder( value, resolver, addonClassLoaders );
+			case ICON:			return parseInstance( value, addonClassLoaders );
 			case INSETS:		return parseInsets( value );
-			case SIZE:			return parseSize( value );
-			case COLOR:			return parseColor( value, true );
-			case SCALEDNUMBER:	return parseScaledNumber( value );
+			case DIMENSION:		return parseDimension( value );
+			case COLOR:			return parseColorOrFunction( value, resolver, true );
+			case SCALEDINTEGER:	return parseScaledInteger( value );
+			case SCALEDFLOAT:	return parseScaledFloat( value );
+			case SCALEDINSETS:	return parseScaledInsets( value );
+			case SCALEDDIMENSION:return parseScaledDimension( value );
+			case INSTANCE:		return parseInstance( value, addonClassLoaders );
+			case CLASS:			return parseClass( value, addonClassLoaders );
+			case GRAYFILTER:	return parseGrayFilter( value );
 			case UNKNOWN:
 			default:
 				// colors
-				ColorUIResource color = parseColor( value, false );
+				Object color = parseColorOrFunction( value, resolver, false );
 				if( color != null )
 					return color;
 
@@ -235,40 +331,75 @@ class UIDefaultsLoader
 				if( integer != null )
 					return integer;
 
+				// float
+				Float f = parseFloat( value, false );
+				if( f != null )
+					return f;
+
 				// string
 				return value;
 		}
 	}
 
-	private static Object parseBorder( String value, Function<String, String> resolver ) {
+	private static Object parseBorder( String value, Function<String, String> resolver, List<ClassLoader> addonClassLoaders ) {
 		if( value.indexOf( ',' ) >= 0 ) {
-			// top,left,bottom,right[,lineColor]
+			// top,left,bottom,right[,lineColor[,lineThickness]]
 			List<String> parts = split( value, ',' );
 			Insets insets = parseInsets( value );
-			ColorUIResource lineColor = (parts.size() == 5)
-				? parseColor( resolver.apply( parts.get( 4 ) ), true )
+			ColorUIResource lineColor = (parts.size() >= 5)
+				? (ColorUIResource) parseColorOrFunction( resolver.apply( parts.get( 4 ) ), resolver, true )
 				: null;
+			float lineThickness = (parts.size() >= 6) ? parseFloat( parts.get( 5 ), true ) : 1f;
 
 			return (LazyValue) t -> {
 				return (lineColor != null)
-					? new FlatLineBorder( insets, lineColor )
+					? new FlatLineBorder( insets, lineColor, lineThickness )
 					: new FlatEmptyBorder( insets );
 			};
 		} else
-			return parseInstance( value );
+			return parseInstance( value, addonClassLoaders );
 	}
 
-	private static Object parseInstance( String value ) {
+	private static Object parseInstance( String value, List<ClassLoader> addonClassLoaders ) {
 		return (LazyValue) t -> {
 			try {
-				return Class.forName( value ).newInstance();
+				return findClass( value, addonClassLoaders ).newInstance();
 			} catch( InstantiationException | IllegalAccessException | ClassNotFoundException ex ) {
-				ex.printStackTrace();
+				FlatLaf.LOG.log( Level.SEVERE, "FlatLaf: Failed to instantiate '" + value + "'.", ex );
 				return null;
 			}
 		};
 	}
 
+	private static Object parseClass( String value, List<ClassLoader> addonClassLoaders ) {
+		return (LazyValue) t -> {
+			try {
+				return findClass( value, addonClassLoaders );
+			} catch( ClassNotFoundException ex ) {
+				FlatLaf.LOG.log( Level.SEVERE, "FlatLaf: Failed to find class '" + value + "'.", ex );
+				return null;
+			}
+		};
+	}
+
+	private static Class<?> findClass( String className, List<ClassLoader> addonClassLoaders )
+		throws ClassNotFoundException
+	{
+		try {
+			return Class.forName( className );
+		} catch( ClassNotFoundException ex ) {
+			// search in addons class loaders
+			for( ClassLoader addonClassLoader : addonClassLoaders ) {
+				try {
+					return addonClassLoader.loadClass( className );
+				} catch( ClassNotFoundException ex2 ) {
+					// ignore
+				}
+			}
+			throw ex;
+		}
+	}
+
 	private static Insets parseInsets( String value ) {
 		List<String> numbers = split( value, ',' );
 		try {
@@ -282,7 +413,7 @@ class UIDefaultsLoader
 		}
 	}
 
-	private static Dimension parseSize( String value ) {
+	private static Dimension parseDimension( String value ) {
 		List<String> numbers = split( value, ',' );
 		try {
 			return new DimensionUIResource(
@@ -293,20 +424,24 @@ class UIDefaultsLoader
 		}
 	}
 
-	private static ColorUIResource parseColor( String value, boolean reportError ) {
+	private static Object parseColorOrFunction( String value, Function<String, String> resolver, boolean reportError ) {
 		if( value.endsWith( ")" ) )
-			return parseColorFunctions( value, reportError );
+			return parseColorFunctions( value, resolver, reportError );
 
+		return parseColor( value, reportError );
+	}
+
+	static ColorUIResource parseColor( String value ) {
+		return parseColor( value, false );
+	}
+
+	private static ColorUIResource parseColor( String value, boolean reportError ) {
 		try {
-			int rgb = Integer.parseInt( value, 16 );
-			if( value.length() == 6 )
-				return new ColorUIResource( rgb );
-			if( value.length() == 8 )
-				return new ColorUIResource( new Color( rgb, true ) );
-
-			if( reportError )
-				throw new NumberFormatException( value );
-		} catch( NumberFormatException ex ) {
+			int rgba = parseColorRGBA( value );
+			return ((rgba & 0xff000000) == 0xff000000)
+				? new ColorUIResource( rgba )
+				: new ColorUIResource( new Color( rgba, true ) );
+		} catch( IllegalArgumentException ex ) {
 			if( reportError )
 				throw new IllegalArgumentException( "invalid color '" + value + "'" );
 
@@ -315,7 +450,51 @@ class UIDefaultsLoader
 		return null;
 	}
 
-	private static ColorUIResource parseColorFunctions( String value, boolean reportError ) {
+	/**
+	 * Parses a hex color in  {@code #RGB}, {@code #RGBA}, {@code #RRGGBB} or {@code #RRGGBBAA}
+	 * format and returns it as {@code rgba} integer suitable for {@link java.awt.Color},
+	 * which includes alpha component in bits 24-31.
+	 *
+	 * @throws IllegalArgumentException
+	 */
+	static int parseColorRGBA( String value ) {
+		int len = value.length();
+		if( (len != 4 && len != 5 && len != 7 && len != 9) || value.charAt( 0 ) != '#' )
+			throw new IllegalArgumentException();
+
+		// parse hex
+		int n = 0;
+		for( int i = 1; i < len; i++ ) {
+			char ch = value.charAt( i );
+
+			int digit;
+			if( ch >= '0' && ch <= '9' )
+				digit = ch - '0';
+			else if( ch >= 'a' && ch <= 'f' )
+				digit = ch - 'a' + 10;
+			else if( ch >= 'A' && ch <= 'F' )
+				digit = ch - 'A' + 10;
+			else
+				throw new IllegalArgumentException();
+
+			n = (n << 4) | digit;
+		}
+
+		if( len <= 5 ) {
+			// double nibbles
+			int n1 = n & 0xf000;
+			int n2 = n & 0xf00;
+			int n3 = n & 0xf0;
+			int n4 = n & 0xf;
+			n = (n1 << 16) | (n1 << 12) | (n2 << 12) | (n2 << 8) | (n3 << 8) | (n3 << 4) | (n4 << 4) | n4;
+		}
+
+		return (len == 4 || len == 7)
+			? (0xff000000 | n) // set alpha to 255
+			: (((n >> 8) & 0xffffff) | ((n & 0xff) << 24)); // move alpha from lowest to highest byte
+	}
+
+	private static Object parseColorFunctions( String value, Function<String, String> resolver, boolean reportError ) {
 		int paramsStart = value.indexOf( '(' );
 		if( paramsStart < 0 ) {
 			if( reportError )
@@ -324,37 +503,135 @@ class UIDefaultsLoader
 		}
 
 		String function = value.substring( 0, paramsStart ).trim();
-		List<String> params = split( value.substring( paramsStart + 1, value.length() - 1 ), ',' );
+		List<String> params = splitFunctionParams( value.substring( paramsStart + 1, value.length() - 1 ), ',' );
 		if( params.isEmpty() )
 			throw new IllegalArgumentException( "missing parameters in function '" + value + "'" );
 
 		switch( function ) {
-			case "lighten":		return parseColorLightenOrDarken( true, params, reportError );
-			case "darken":		return parseColorLightenOrDarken( false, params, reportError );
+			case "rgb":			return parseColorRgbOrRgba( false, params, resolver, reportError );
+			case "rgba":		return parseColorRgbOrRgba( true, params, resolver, reportError );
+			case "hsl":			return parseColorHslOrHsla( false, params );
+			case "hsla":		return parseColorHslOrHsla( true, params );
+			case "lighten":		return parseColorHSLIncreaseDecrease( 2, true, params, resolver, reportError );
+			case "darken":		return parseColorHSLIncreaseDecrease( 2, false, params, resolver, reportError );
+			case "saturate":	return parseColorHSLIncreaseDecrease( 1, true, params, resolver, reportError );
+			case "desaturate":	return parseColorHSLIncreaseDecrease( 1, false, params, resolver, reportError );
 		}
 
 		throw new IllegalArgumentException( "unknown color function '" + value + "'" );
 	}
 
 	/**
-	 * Syntax: lighten(amount[,options]) or darken(amount[,options])
-	 *   - amount: percentage 0-100%
-	 *   - options: [relative] [autoInverse]
+	 * Syntax: rgb(red,green,blue) or rgba(red,green,blue,alpha) or rgba(color,alpha)
+	 *   - red:   an integer 0-255 or a percentage 0-100%
+	 *   - green: an integer 0-255 or a percentage 0-100%
+	 *   - blue:  an integer 0-255 or a percentage 0-100%
+	 *   - alpha: an integer 0-255 or a percentage 0-100%
 	 */
-	private static ColorUIResource parseColorLightenOrDarken( boolean lighten, List<String> params, boolean reportError ) {
-		int amount = parsePercentage( params.get( 0 ) );
-		boolean relative = false;
-		boolean autoInverse = false;
+	private static ColorUIResource parseColorRgbOrRgba( boolean hasAlpha, List<String> params,
+		Function<String, String> resolver, boolean reportError )
+	{
+		if( hasAlpha && params.size() == 2 ) {
+			// syntax rgba(color,alpha), which allows adding alpha to any color
+			String colorStr = params.get( 0 );
+			int alpha = parseInteger( params.get( 1 ), 0, 255, true );
 
-		if( params.size() >= 2 ) {
-			String options = params.get( 1 );
-			relative = options.contains( "relative" );
-			autoInverse = options.contains( "autoInverse" );
+			ColorUIResource color = (ColorUIResource) parseColorOrFunction( resolver.apply( colorStr ), resolver, reportError );
+			return new ColorUIResource( new Color( ((alpha & 0xff) << 24) | (color.getRGB() & 0xffffff), true ) );
 		}
 
-		return new DerivedColor( lighten
-			? new ColorFunctions.Lighten( amount, relative, autoInverse )
-			: new ColorFunctions.Darken( amount, relative, autoInverse ) );
+		int red = parseInteger( params.get( 0 ), 0, 255, true );
+		int green = parseInteger( params.get( 1 ), 0, 255, true );
+		int blue = parseInteger( params.get( 2 ), 0, 255, true );
+		int alpha = hasAlpha ? parseInteger( params.get( 3 ), 0, 255, true ) : 255;
+
+		return hasAlpha
+			? new ColorUIResource( new Color( red, green, blue, alpha ) )
+			: new ColorUIResource( red, green, blue );
+	}
+
+	/**
+	 * Syntax: hsl(hue,saturation,lightness) or hsla(hue,saturation,lightness,alpha)
+	 *   - hue: an integer 0-360 representing degrees
+	 *   - saturation: a percentage 0-100%
+	 *   - lightness: a percentage 0-100%
+	 *   - alpha: a percentage 0-100%
+	 */
+	private static ColorUIResource parseColorHslOrHsla( boolean hasAlpha, List<String> params ) {
+		int hue = parseInteger( params.get( 0 ), 0, 360, false );
+		int saturation = parsePercentage( params.get( 1 ) );
+		int lightness = parsePercentage( params.get( 2 ) );
+		int alpha = hasAlpha ? parsePercentage( params.get( 3 ) ) : 100;
+
+		float[] hsl = new float[] { hue, saturation, lightness };
+		return new ColorUIResource( HSLColor.toRGB( hsl, alpha / 100f ) );
+	}
+
+	/**
+	 * Syntax: lighten(color,amount[,options]) or darken(color,amount[,options]) or
+	 *         saturate(color,amount[,options]) or desaturate(color,amount[,options])
+	 *   - color: a color (e.g. #f00) or a color function
+	 *   - amount: percentage 0-100%
+	 *   - options: [relative] [autoInverse] [noAutoInverse] [lazy] [derived]
+	 */
+	private static Object parseColorHSLIncreaseDecrease( int hslIndex, boolean increase,
+		List<String> params, Function<String, String> resolver, boolean reportError )
+	{
+		String colorStr = params.get( 0 );
+		int amount = parsePercentage( params.get( 1 ) );
+		boolean relative = false;
+		boolean autoInverse = false;
+		boolean lazy = false;
+		boolean derived = false;
+
+		if( params.size() > 2 ) {
+			String options = params.get( 2 );
+			relative = options.contains( "relative" );
+			autoInverse = options.contains( "autoInverse" );
+			lazy = options.contains( "lazy" );
+			derived = options.contains( "derived" );
+
+			// use autoInverse by default for derived colors, except if noAutoInverse is set
+			if( derived && !options.contains( "noAutoInverse" ) )
+				autoInverse = true;
+		}
+
+		// create function
+		ColorFunction function = new ColorFunctions.HSLIncreaseDecrease(
+			hslIndex, increase, amount, relative, autoInverse );
+
+		if( lazy ) {
+			return (LazyValue) t -> {
+				Object color = lazyUIManagerGet( colorStr );
+				return (color instanceof Color)
+					? new ColorUIResource( ColorFunctions.applyFunctions( (Color) color, function ) )
+					: null;
+			};
+		}
+
+		// parse base color
+		String resolvedColorStr = resolver.apply( colorStr );
+		ColorUIResource baseColor = (ColorUIResource) parseColorOrFunction( resolvedColorStr, resolver, reportError );
+
+		// apply this function to base color
+		Color newColor = ColorFunctions.applyFunctions( baseColor, function );
+
+		if( derived ) {
+			ColorFunction[] functions;
+			if( baseColor instanceof DerivedColor && resolvedColorStr == colorStr ) {
+				// if the base color is also derived, join the color functions
+				// but only if base color function is specified directly in this function
+				ColorFunction[] baseFunctions = ((DerivedColor)baseColor).getFunctions();
+				functions = new ColorFunction[baseFunctions.length + 1];
+				System.arraycopy( baseFunctions, 0, functions, 0, baseFunctions.length );
+				functions[baseFunctions.length] = function;
+			} else
+				functions = new ColorFunction[] { function };
+
+			return new DerivedColor( newColor, functions );
+		}
+
+		return new ColorUIResource( newColor );
 	}
 
 	private static int parsePercentage( String value ) {
@@ -373,6 +650,24 @@ class UIDefaultsLoader
 		return val;
 	}
 
+	private static Character parseCharacter( String value ) {
+		if( value.length() != 1 )
+			throw new IllegalArgumentException( "invalid character '" + value + "'" );
+		return value.charAt( 0 );
+	}
+
+	private static Integer parseInteger( String value, int min, int max, boolean allowPercentage ) {
+		if( allowPercentage && value.endsWith( "%" ) ) {
+			int percent = parsePercentage( value );
+			return (max * percent) / 100;
+		}
+
+		Integer integer = parseInteger( value, true );
+		if( integer.intValue() < min || integer.intValue() > max )
+			throw new NumberFormatException( "integer '" + value + "' out of range (" + min + '-' + max + ')' );
+		return integer;
+	}
+
 	private static Integer parseInteger( String value, boolean reportError ) {
 		try {
 			return Integer.parseInt( value );
@@ -383,25 +678,112 @@ class UIDefaultsLoader
 		return null;
 	}
 
-	private static ScaledNumber parseScaledNumber( String value ) {
+	private static Float parseFloat( String value, boolean reportError ) {
 		try {
-			return new ScaledNumber( Integer.parseInt( value ) );
+			return Float.parseFloat( value );
 		} catch( NumberFormatException ex ) {
-			throw new NumberFormatException( "invalid integer '" + value + "'" );
+			if( reportError )
+				throw new NumberFormatException( "invalid float '" + value + "'" );
+		}
+		return null;
+	}
+
+	private static ActiveValue parseScaledInteger( String value ) {
+		int val = parseInteger( value, true );
+		return (ActiveValue) t -> {
+			return UIScale.scale( val );
+		};
+	}
+
+	private static ActiveValue parseScaledFloat( String value ) {
+		float val = parseFloat( value, true );
+		return (ActiveValue) t -> {
+			return UIScale.scale( val );
+		};
+	}
+
+	private static ActiveValue parseScaledInsets( String value ) {
+		Insets insets = parseInsets( value );
+		return (ActiveValue) t -> {
+			return UIScale.scale( insets );
+		};
+	}
+
+	private static ActiveValue parseScaledDimension( String value ) {
+		Dimension dimension = parseDimension( value );
+		return (ActiveValue) t -> {
+			return UIScale.scale( dimension );
+		};
+	}
+
+	private static Object parseGrayFilter( String value ) {
+		List<String> numbers = split( value, ',' );
+		try {
+			int brightness = Integer.parseInt( numbers.get( 0 ) );
+			int contrast = Integer.parseInt( numbers.get( 1 ) );
+			int alpha = Integer.parseInt( numbers.get( 2 ) );
+
+			return (LazyValue) t -> {
+				return new GrayFilter( brightness, contrast, alpha );
+			};
+		} catch( NumberFormatException ex ) {
+			throw new IllegalArgumentException( "invalid gray filter '" + value + "'" );
 		}
 	}
 
-	static List<String> split( String str, char delim ) {
+	/**
+	 * Split string and trim parts.
+	 */
+	private static List<String> split( String str, char delim ) {
+		List<String> result = StringUtils.split( str, delim );
+
+		// trim strings
+		int size = result.size();
+		for( int i = 0; i < size; i++ )
+			result.set( i, result.get( i ).trim() );
+
+		return result;
+	}
+
+	/**
+	 * Splits function parameters and allows using functions as parameters.
+	 * In other words: Delimiters surrounded by '(' and ')' are ignored.
+	 */
+	private static List<String> splitFunctionParams( String str, char delim ) {
 		ArrayList<String> strs = new ArrayList<>();
-		int delimIndex = str.indexOf( delim );
-		int index = 0;
-		while( delimIndex >= 0 ) {
-			strs.add( str.substring( index, delimIndex ) );
-			index = delimIndex + 1;
-			delimIndex = str.indexOf( delim, index );
+		int nestLevel = 0;
+		int start = 0;
+		int strlen = str.length();
+		for( int i = 0; i < strlen; i++ ) {
+			char ch = str.charAt( i );
+			if( ch == '(' )
+				nestLevel++;
+			else if( ch == ')' )
+				nestLevel--;
+			else if( nestLevel == 0 && ch == delim ) {
+				strs.add( str.substring( start, i ).trim() );
+				start = i + 1;
+			}
 		}
-		strs.add( str.substring( index ) );
+		strs.add( str.substring( start ).trim() );
 
 		return strs;
 	}
+
+	/**
+	 * For use in LazyValue to get value for given key from UIManager and report error
+	 * if not found. If key is prefixed by '?', then no error is reported.
+	 */
+	private static Object lazyUIManagerGet( String uiKey ) {
+		boolean optional = false;
+		if( uiKey.startsWith( OPTIONAL_PREFIX ) ) {
+			uiKey = uiKey.substring( OPTIONAL_PREFIX.length() );
+			optional = true;
+		}
+
+		Object value = UIManager.get( uiKey );
+		if( value == null && !optional )
+			FlatLaf.LOG.log( Level.SEVERE, "FlatLaf: '" + uiKey + "' not found in UI defaults." );
+		return value;
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatAscendingSortIcon.java

@@ -16,15 +16,18 @@
 
 package com.formdev.flatlaf.icons;
 
+import java.awt.BasicStroke;
 import java.awt.Color;
 import java.awt.Component;
 import java.awt.Graphics2D;
+import java.awt.geom.Path2D;
 import javax.swing.UIManager;
 import com.formdev.flatlaf.ui.FlatUIUtils;
 
 /**
  * "ascendingSort" icon for {@link javax.swing.table.JTableHeader}.
  *
+ * @uiDefault Component.arrowType				String	triangle (default) or chevron
  * @uiDefault Table.sortIconColor				Color
  *
  * @author Karl Tauber
@@ -32,6 +35,7 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 public class FlatAscendingSortIcon
 	extends FlatAbstractIcon
 {
+	protected final boolean chevron = "chevron".equals( UIManager.getString( "Component.arrowType" ) );
 	protected final Color sortIconColor = UIManager.getColor( "Table.sortIconColor" );
 
 	public FlatAscendingSortIcon() {
@@ -41,6 +45,14 @@ public class FlatAscendingSortIcon
 	@Override
 	protected void paintIcon( Component c, Graphics2D g ) {
 		g.setColor( sortIconColor );
-		g.fill( FlatUIUtils.createPath( 0.5,5, 9.5,5, 5,0 ) );
+		if( chevron ) {
+			// chevron arrow
+			Path2D path = FlatUIUtils.createPath( false, 1,4, 5,0, 9,4 );
+			g.setStroke( new BasicStroke( 1f ) );
+			g.draw( path );
+		} else {
+			// triangle arrow
+			g.fill( FlatUIUtils.createPath( 0.5,5, 5,0, 9.5,5 ) );
+		}
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatCapsLockIcon.java

@@ -0,0 +1,59 @@
+/*
+ * Copyright 2020 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.icons;
+
+import java.awt.Component;
+import java.awt.Graphics2D;
+import java.awt.geom.Path2D;
+import java.awt.geom.Rectangle2D;
+import java.awt.geom.RoundRectangle2D;
+import javax.swing.UIManager;
+import com.formdev.flatlaf.ui.FlatUIUtils;
+
+/**
+ * "caps lock" icon for {@link javax.swing.JPasswordField}.
+ *
+ * @uiDefault PasswordField.capsLockIconColor			Color
+ *
+ * @author Karl Tauber
+ */
+public class FlatCapsLockIcon
+	extends FlatAbstractIcon
+{
+	public FlatCapsLockIcon() {
+		super( 16, 16, UIManager.getColor( "PasswordField.capsLockIconColor" ) );
+	}
+
+	@Override
+	protected void paintIcon( Component c, Graphics2D g ) {
+		/*
+			<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16">
+			  <g fill="none" fill-rule="evenodd">
+			    <rect width="16" height="16" fill="#6E6E6E" rx="3"/>
+			    <rect width="6" height="2" x="5" y="12" fill="#FFF"/>
+    			<path fill="#FFF" d="M2,8 L8,2 L14,8 L11,8 L11,10 L5,10 L5,8 L2,8 Z"/>
+			  </g>
+			</svg>
+		*/
+
+		Path2D path = new Path2D.Float( Path2D.WIND_EVEN_ODD );
+		path.append( new RoundRectangle2D.Float( 0, 0, 16, 16, 6, 6 ), false );
+		path.append( new Rectangle2D.Float( 5, 12, 6, 2 ), false );
+		path.append( FlatUIUtils.createPath( 2,8, 8,2, 14,8, 11,8, 11,10, 5,10, 5,8 ), false );
+		g.fill( path );
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatCheckBoxIcon.java

@@ -38,6 +38,7 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
  *
  * @uiDefault Component.focusWidth						int
  * @uiDefault Component.focusColor						Color
+ * @uiDefault CheckBox.icon.focusedColor				Color	optional; defaults to Component.focusColor
  * @uiDefault CheckBox.icon.borderColor					Color
  * @uiDefault CheckBox.icon.disabledBorderColor			Color
  * @uiDefault CheckBox.icon.selectedBorderColor			Color
@@ -61,8 +62,9 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 public class FlatCheckBoxIcon
 	extends FlatAbstractIcon
 {
-	protected final int focusWidth = UIManager.getInt( "Component.focusWidth" );
-	protected final Color focusColor = UIManager.getColor( "Component.focusColor" );
+	public final int focusWidth = UIManager.getInt( "Component.focusWidth" );
+	protected final Color focusColor = FlatUIUtils.getUIColor( "CheckBox.icon.focusedColor",
+		UIManager.getColor( "Component.focusColor" ) );
 	protected final int arc = FlatUIUtils.getUIInt( "CheckBox.arc", 2 );
 
 	protected final Color borderColor = UIManager.getColor( "CheckBox.icon.borderColor" );
@@ -94,7 +96,7 @@ public class FlatCheckBoxIcon
 		boolean selected = indeterminate || (c instanceof AbstractButton && ((AbstractButton)c).isSelected());
 
 		// paint focused border
-		if( c.hasFocus() && focusWidth > 0 ) {
+		if( FlatUIUtils.isPermanentFocusOwner( c ) && focusWidth > 0 ) {
 			g2.setColor( focusColor );
 			paintFocusBorder( g2 );
 		}
@@ -109,13 +111,13 @@ public class FlatCheckBoxIcon
 		paintBorder( g2 );
 
 		// paint background
-		FlatUIUtils.setColor( g2, FlatButtonUI.buttonStateColor( c,
+		g2.setColor( FlatUIUtils.deriveColor( FlatButtonUI.buttonStateColor( c,
 			selected ? selectedBackground : background,
 			disabledBackground,
 			focusedBackground,
 			selected && selectedHoverBackground != null ? selectedHoverBackground : hoverBackground,
 			selected && selectedPressedBackground != null ? selectedPressedBackground : pressedBackground ),
-			background );
+			background ) );
 		paintBackground( g2 );
 
 		// paint checkmark
@@ -131,17 +133,17 @@ public class FlatCheckBoxIcon
 	protected void paintFocusBorder( Graphics2D g2 ) {
 		// the outline focus border is painted outside of the icon
 		int wh = ICON_SIZE - 1 + (focusWidth * 2);
-		int arcwh = (arc + focusWidth) * 2;
+		int arcwh = arc + (focusWidth * 2);
 		g2.fillRoundRect( -focusWidth + 1, -focusWidth, wh, wh, arcwh, arcwh );
 	}
 
 	protected void paintBorder( Graphics2D g2 ) {
-		int arcwh = arc * 2;
+		int arcwh = arc;
 		g2.fillRoundRect( 1, 0, 14, 14, arcwh, arcwh );
 	}
 
 	protected void paintBackground( Graphics2D g2 ) {
-		int arcwh = (arc * 2) - 1;
+		int arcwh = arc - 1;
 		g2.fillRoundRect( 2, 1, 12, 12, arcwh, arcwh );
 	}
 

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatCheckBoxMenuItemIcon.java

@@ -30,7 +30,8 @@ import javax.swing.UIManager;
  *
  * @uiDefault MenuItemCheckBox.icon.checkmarkColor				Color
  * @uiDefault MenuItemCheckBox.icon.disabledCheckmarkColor		Color
- * @uiDefault Menu.selectionForeground							Color
+ * @uiDefault MenuItem.selectionForeground						Color
+ * @uiDefault MenuItem.selectionType							String
  *
  * @author Karl Tauber
  */
@@ -39,7 +40,7 @@ public class FlatCheckBoxMenuItemIcon
 {
 	protected final Color checkmarkColor = UIManager.getColor( "MenuItemCheckBox.icon.checkmarkColor" );
 	protected final Color disabledCheckmarkColor = UIManager.getColor( "MenuItemCheckBox.icon.disabledCheckmarkColor" );
-	protected final Color selectionForeground = UIManager.getColor( "Menu.selectionForeground" );
+	protected final Color selectionForeground = UIManager.getColor( "MenuItem.selectionForeground" );
 
 	public FlatCheckBoxMenuItemIcon() {
 		super( 15, 15, null );
@@ -67,9 +68,14 @@ public class FlatCheckBoxMenuItemIcon
 	}
 
 	private Color getCheckmarkColor( Component c ) {
-		if( c instanceof JMenuItem && ((JMenuItem)c).isArmed() )
+		if( c instanceof JMenuItem && ((JMenuItem)c).isArmed() && !isUnderlineSelection() )
 			return selectionForeground;
 
 		return c.isEnabled() ? checkmarkColor : disabledCheckmarkColor;
 	}
+
+	private boolean isUnderlineSelection() {
+		// not storing value of "MenuItem.selectionType" in class to allow changing at runtime
+		return "underline".equals( UIManager.getString( "MenuItem.selectionType" ) );
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatDescendingSortIcon.java

@@ -16,15 +16,18 @@
 
 package com.formdev.flatlaf.icons;
 
+import java.awt.BasicStroke;
 import java.awt.Color;
 import java.awt.Component;
 import java.awt.Graphics2D;
+import java.awt.geom.Path2D;
 import javax.swing.UIManager;
 import com.formdev.flatlaf.ui.FlatUIUtils;
 
 /**
  * "descendingSort" icon for {@link javax.swing.table.JTableHeader}.
  *
+ * @uiDefault Component.arrowType				String	triangle (default) or chevron
  * @uiDefault Table.sortIconColor				Color
  *
  * @author Karl Tauber
@@ -32,6 +35,7 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 public class FlatDescendingSortIcon
 	extends FlatAbstractIcon
 {
+	protected final boolean chevron = "chevron".equals( UIManager.getString( "Component.arrowType" ) );
 	protected final Color sortIconColor = UIManager.getColor( "Table.sortIconColor" );
 
 	public FlatDescendingSortIcon() {
@@ -41,6 +45,14 @@ public class FlatDescendingSortIcon
 	@Override
 	protected void paintIcon( Component c, Graphics2D g ) {
 		g.setColor( sortIconColor );
-		g.fill( FlatUIUtils.createPath( 0.5,0, 9.5,0, 5,5 ) );
+		if( chevron ) {
+			// chevron arrow
+			Path2D path = FlatUIUtils.createPath( false, 1,0, 5,4, 9,0 );
+			g.setStroke( new BasicStroke( 1f ) );
+			g.draw( path );
+		} else {
+			// triangle arrow
+			g.fill( FlatUIUtils.createPath( 0.5,0, 5,5, 9.5,0 ) );
+		}
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatFileChooserDetailsViewIcon.java

@@ -23,7 +23,7 @@ import javax.swing.UIManager;
 /**
  * "details view" icon for {@link javax.swing.JFileChooser}.
  *
- * @uiDefault FileChooser.icon.detailsViewColor		Color
+ * @uiDefault Actions.Grey							Color
  *
  * @author Karl Tauber
  */
@@ -31,7 +31,7 @@ public class FlatFileChooserDetailsViewIcon
 	extends FlatAbstractIcon
 {
 	public FlatFileChooserDetailsViewIcon() {
-		super( 16, 16, UIManager.getColor( "FileChooser.icon.detailsViewColor" ) );
+		super( 16, 16, UIManager.getColor( "Actions.Grey" ) );
 	}
 
 	@Override

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatFileChooserHomeFolderIcon.java

@@ -24,7 +24,7 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 /**
  * "home folder" icon for {@link javax.swing.JFileChooser}.
  *
- * @uiDefault FileChooser.icon.homeFolderColor		Color
+ * @uiDefault Actions.Grey							Color
  *
  * @author Karl Tauber
  */
@@ -32,7 +32,7 @@ public class FlatFileChooserHomeFolderIcon
 	extends FlatAbstractIcon
 {
 	public FlatFileChooserHomeFolderIcon() {
-		super( 16, 16, UIManager.getColor( "FileChooser.icon.homeFolderColor" ) );
+		super( 16, 16, UIManager.getColor( "Actions.Grey" ) );
 	}
 
 	@Override

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatFileChooserListViewIcon.java

@@ -23,7 +23,7 @@ import javax.swing.UIManager;
 /**
  * "list view" icon for {@link javax.swing.JFileChooser}.
  *
- * @uiDefault FileChooser.icon.listViewColor		Color
+ * @uiDefault Actions.Grey							Color
  *
  * @author Karl Tauber
  */
@@ -31,7 +31,7 @@ public class FlatFileChooserListViewIcon
 	extends FlatAbstractIcon
 {
 	public FlatFileChooserListViewIcon() {
-		super( 16, 16, UIManager.getColor( "FileChooser.icon.listViewColor" ) );
+		super( 16, 16, UIManager.getColor( "Actions.Grey" ) );
 	}
 
 	@Override

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatFileChooserNewFolderIcon.java

@@ -24,7 +24,7 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 /**
  * "new folder" icon for {@link javax.swing.JFileChooser}.
  *
- * @uiDefault FileChooser.icon.newFolderColor		Color
+ * @uiDefault Actions.Grey							Color
  *
  * @author Karl Tauber
  */
@@ -32,7 +32,7 @@ public class FlatFileChooserNewFolderIcon
 	extends FlatAbstractIcon
 {
 	public FlatFileChooserNewFolderIcon() {
-		super( 16, 16, UIManager.getColor( "FileChooser.icon.newFolderColor" ) );
+		super( 16, 16, UIManager.getColor( "Actions.Grey" ) );
 	}
 
 	@Override

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatFileChooserUpFolderIcon.java

@@ -16,6 +16,7 @@
 
 package com.formdev.flatlaf.icons;
 
+import java.awt.Color;
 import java.awt.Component;
 import java.awt.Graphics2D;
 import javax.swing.UIManager;
@@ -24,15 +25,18 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 /**
  * "up folder" icon for {@link javax.swing.JFileChooser}.
  *
- * @uiDefault FileChooser.icon.upFolderColor		Color
+ * @uiDefault Actions.Grey							Color
+ * @uiDefault Actions.Blue							Color
  *
  * @author Karl Tauber
  */
 public class FlatFileChooserUpFolderIcon
 	extends FlatAbstractIcon
 {
+	private final Color blueColor = UIManager.getColor( "Actions.Blue" );
+
 	public FlatFileChooserUpFolderIcon() {
-		super( 16, 16, UIManager.getColor( "FileChooser.icon.upFolderColor" ) );
+		super( 16, 16, UIManager.getColor( "Actions.Grey" ) );
 	}
 
 	@Override
@@ -47,6 +51,8 @@ public class FlatFileChooserUpFolderIcon
 		*/
 
 		g.fill( FlatUIUtils.createPath( 2,3, 5.5,3, 7,5, 9,5, 9,9, 13,9, 13,5, 14,5, 14,13, 2,13 ) );
+
+		g.setColor( blueColor );
 		g.fill( FlatUIUtils.createPath( 12,4, 12,8, 10,8, 10,4, 8,4, 11,1, 14,4, 12,4 ) );
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatFileViewComputerIcon.java

@@ -25,7 +25,7 @@ import javax.swing.UIManager;
 /**
  * "computer" icon for {@link javax.swing.JFileChooser}.
  *
- * @uiDefault FileView.icon.computerColor		Color
+ * @uiDefault Objects.Grey						Color
  *
  * @author Karl Tauber
  */
@@ -33,7 +33,7 @@ public class FlatFileViewComputerIcon
 	extends FlatAbstractIcon
 {
 	public FlatFileViewComputerIcon() {
-		super( 16, 16, UIManager.getColor( "FileView.icon.computerColor" ) );
+		super( 16, 16, UIManager.getColor( "Objects.Grey" ) );
 	}
 
 	@Override

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatFileViewDirectoryIcon.java

@@ -24,7 +24,7 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 /**
  * "directory" icon for {@link javax.swing.JFileChooser}.
  *
- * @uiDefault FileView.icon.directoryColor		Color
+ * @uiDefault Objects.Grey						Color
  *
  * @author Karl Tauber
  */
@@ -32,7 +32,7 @@ public class FlatFileViewDirectoryIcon
 	extends FlatAbstractIcon
 {
 	public FlatFileViewDirectoryIcon() {
-		super( 16, 16, UIManager.getColor( "FileView.icon.directoryColor" ) );
+		super( 16, 16, UIManager.getColor( "Objects.Grey" ) );
 	}
 
 	@Override

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatFileViewFileIcon.java

@@ -24,7 +24,7 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 /**
  * "file" icon for {@link javax.swing.JFileChooser}.
  *
- * @uiDefault FileView.icon.fileColor			Color
+ * @uiDefault Objects.Grey						Color
  *
  * @author Karl Tauber
  */
@@ -32,7 +32,7 @@ public class FlatFileViewFileIcon
 	extends FlatAbstractIcon
 {
 	public FlatFileViewFileIcon() {
-		super( 16, 16, UIManager.getColor( "FileView.icon.fileColor" ) );
+		super( 16, 16, UIManager.getColor( "Objects.Grey" ) );
 	}
 
 	@Override

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatFileViewFloppyDriveIcon.java

@@ -25,7 +25,7 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 /**
  * "floppy drive" icon for {@link javax.swing.JFileChooser}.
  *
- * @uiDefault FileView.icon.floppyDriveColor		Color
+ * @uiDefault Objects.Grey							Color
  *
  * @author Karl Tauber
  */
@@ -33,7 +33,7 @@ public class FlatFileViewFloppyDriveIcon
 	extends FlatAbstractIcon
 {
 	public FlatFileViewFloppyDriveIcon() {
-		super( 16, 16, UIManager.getColor( "FileView.icon.floppyDriveColor" ) );
+		super( 16, 16, UIManager.getColor( "Objects.Grey" ) );
 	}
 
 	@Override

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatFileViewHardDriveIcon.java

@@ -25,7 +25,7 @@ import javax.swing.UIManager;
 /**
  * "hard drive" icon for {@link javax.swing.JFileChooser}.
  *
- * @uiDefault FileView.icon.hardDriveColor		Color
+ * @uiDefault Objects.Grey						Color
  *
  * @author Karl Tauber
  */
@@ -33,7 +33,7 @@ public class FlatFileViewHardDriveIcon
 	extends FlatAbstractIcon
 {
 	public FlatFileViewHardDriveIcon() {
-		super( 16, 16, UIManager.getColor( "FileView.icon.hardDriveColor" ) );
+		super( 16, 16, UIManager.getColor( "Objects.Grey" ) );
 	}
 
 	@Override

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatHelpButtonIcon.java

@@ -82,7 +82,7 @@ public class FlatHelpButtonIcon
 		*/
 
 		boolean enabled = c.isEnabled();
-		boolean focused = c.hasFocus();
+		boolean focused = FlatUIUtils.isPermanentFocusOwner( c );
 
 		// paint focused border
 		if( focused ) {
@@ -100,12 +100,12 @@ public class FlatHelpButtonIcon
 		g2.fill( new Ellipse2D.Float( focusWidth + 0.5f, focusWidth + 0.5f, 21, 21 ) );
 
 		// paint background
-		FlatUIUtils.setColor( g2, FlatButtonUI.buttonStateColor( c,
+		g2.setColor( FlatUIUtils.deriveColor( FlatButtonUI.buttonStateColor( c,
 			background,
 			disabledBackground,
 			focusedBackground,
 			hoverBackground,
-			pressedBackground ), background );
+			pressedBackground ), background ) );
 		g2.fill( new Ellipse2D.Float( focusWidth + 1.5f, focusWidth + 1.5f, 19, 19 ) );
 
 		// paint question mark

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatInternalFrameAbstractIcon.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright 2019 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.icons;
+
+import java.awt.Color;
+import java.awt.Component;
+import java.awt.Dimension;
+import java.awt.Graphics2D;
+import javax.swing.UIManager;
+import com.formdev.flatlaf.ui.FlatButtonUI;
+import com.formdev.flatlaf.ui.FlatUIUtils;
+
+/**
+ * Base class for internal frame icons.
+ *
+ * @uiDefault InternalFrame.buttonSize					Dimension
+ * @uiDefault InternalFrame.buttonHoverBackground		Color
+ * @uiDefault InternalFrame.buttonPressedBackground		Color
+ *
+ * @author Karl Tauber
+ */
+public abstract class FlatInternalFrameAbstractIcon
+	extends FlatAbstractIcon
+{
+	private final Color hoverBackground;
+	private final Color pressedBackground;
+
+	public FlatInternalFrameAbstractIcon() {
+		this( UIManager.getDimension( "InternalFrame.buttonSize" ),
+			UIManager.getColor( "InternalFrame.buttonHoverBackground" ),
+			UIManager.getColor( "InternalFrame.buttonPressedBackground" ) );
+	}
+
+	public FlatInternalFrameAbstractIcon( Dimension size, Color hoverBackground, Color pressedBackground ) {
+		super( size.width, size.height, null );
+		this.hoverBackground = hoverBackground;
+		this.pressedBackground = pressedBackground;
+	}
+
+	protected void paintBackground( Component c, Graphics2D g ) {
+		Color background = FlatButtonUI.buttonStateColor( c, null, null, null, hoverBackground, pressedBackground );
+		if( background != null ) {
+			g.setColor( FlatUIUtils.deriveColor( background, c.getBackground() ) );
+			g.fillRect( 0, 0, width, height );
+		}
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatInternalFrameCloseIcon.java

@@ -0,0 +1,67 @@
+/*
+ * Copyright 2019 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.icons;
+
+import java.awt.BasicStroke;
+import java.awt.Color;
+import java.awt.Component;
+import java.awt.Graphics2D;
+import java.awt.geom.Line2D;
+import java.awt.geom.Path2D;
+import javax.swing.UIManager;
+import com.formdev.flatlaf.ui.FlatButtonUI;
+
+/**
+ * "close" icon for {@link javax.swing.JInternalFrame}.
+ *
+ * @uiDefault InternalFrame.buttonSize					Dimension
+ * @uiDefault InternalFrame.closeHoverBackground		Color
+ * @uiDefault InternalFrame.closePressedBackground		Color
+ * @uiDefault InternalFrame.closeHoverForeground		Color
+ * @uiDefault InternalFrame.closePressedForeground		Color
+ *
+ * @author Karl Tauber
+ */
+public class FlatInternalFrameCloseIcon
+	extends FlatInternalFrameAbstractIcon
+{
+	private final Color hoverForeground = UIManager.getColor( "InternalFrame.closeHoverForeground" );
+	private final Color pressedForeground = UIManager.getColor( "InternalFrame.closePressedForeground" );
+
+	public FlatInternalFrameCloseIcon() {
+		super( UIManager.getDimension( "InternalFrame.buttonSize" ),
+			UIManager.getColor( "InternalFrame.closeHoverBackground" ),
+			UIManager.getColor( "InternalFrame.closePressedBackground" ) );
+	}
+
+	@Override
+	protected void paintIcon( Component c, Graphics2D g ) {
+		paintBackground( c, g );
+
+		g.setColor( FlatButtonUI.buttonStateColor( c, c.getForeground(), null, null, hoverForeground, pressedForeground ) );
+
+		float mx = width / 2;
+		float my = height / 2;
+		float r = 3.25f;
+
+		Path2D path = new Path2D.Float( Path2D.WIND_EVEN_ODD );
+		path.append( new Line2D.Float( mx - r, my - r, mx + r, my + r ), false );
+		path.append( new Line2D.Float( mx - r, my + r, mx + r, my - r ), false );
+		g.setStroke( new BasicStroke( 1f ) );
+		g.draw( path );
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatInternalFrameIconifyIcon.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2019 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.icons;
+
+import java.awt.Component;
+import java.awt.Graphics2D;
+
+/**
+ * "iconify" icon for {@link javax.swing.JInternalFrame}.
+ *
+ * @author Karl Tauber
+ */
+public class FlatInternalFrameIconifyIcon
+	extends FlatInternalFrameAbstractIcon
+{
+	public FlatInternalFrameIconifyIcon() {
+	}
+
+	@Override
+	protected void paintIcon( Component c, Graphics2D g ) {
+		paintBackground( c, g );
+
+		g.setColor( c.getForeground() );
+		g.fillRect( (width / 2) - 4, height / 2, 8, 1 );
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatInternalFrameMaximizeIcon.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2019 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.icons;
+
+import java.awt.Component;
+import java.awt.Graphics2D;
+import com.formdev.flatlaf.ui.FlatUIUtils;
+
+/**
+ * "maximize" icon for {@link javax.swing.JInternalFrame}.
+ *
+ * @author Karl Tauber
+ */
+public class FlatInternalFrameMaximizeIcon
+	extends FlatInternalFrameAbstractIcon
+{
+	public FlatInternalFrameMaximizeIcon() {
+	}
+
+	@Override
+	protected void paintIcon( Component c, Graphics2D g ) {
+		paintBackground( c, g );
+
+		g.setColor( c.getForeground() );
+		g.fill( FlatUIUtils.createRectangle( (width / 2) - 4, (height / 2) - 4, 8, 8, 1 ) );
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatInternalFrameRestoreIcon.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2019 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.icons;
+
+import java.awt.Component;
+import java.awt.Graphics2D;
+import java.awt.geom.Area;
+import java.awt.geom.Path2D;
+import java.awt.geom.Rectangle2D;
+import com.formdev.flatlaf.ui.FlatUIUtils;
+
+/**
+ * "restore" (or "minimize") icon for {@link javax.swing.JInternalFrame}.
+ *
+ * @author Karl Tauber
+ */
+public class FlatInternalFrameRestoreIcon
+	extends FlatInternalFrameAbstractIcon
+{
+	public FlatInternalFrameRestoreIcon() {
+	}
+
+	@Override
+	protected void paintIcon( Component c, Graphics2D g ) {
+		paintBackground( c, g );
+
+		g.setColor( c.getForeground() );
+
+		int x = (width / 2) - 4;
+		int y = (height / 2) - 4;
+		Path2D r1 = FlatUIUtils.createRectangle( x + 1, y - 1, 8, 8, 1 );
+		Path2D r2 = FlatUIUtils.createRectangle( x - 1, y + 1, 8, 8, 1 );
+
+		Area area = new Area( r1 );
+		area.subtract( new Area( new Rectangle2D.Float( x - 1, y + 1, 8, 8 ) ) );
+		g.fill( area );
+
+		g.fill( r2 );
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatMenuArrowIcon.java

@@ -32,6 +32,7 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
  * @uiDefault Menu.icon.arrowColor				Color
  * @uiDefault Menu.icon.disabledArrowColor		Color
  * @uiDefault Menu.selectionForeground			Color
+ * @uiDefault MenuItem.selectionType			String
  *
  * @author Karl Tauber
  */
@@ -60,14 +61,19 @@ public class FlatMenuArrowIcon
 			g.draw( path );
 		} else {
 			// triangle arrow
-			g.fill( FlatUIUtils.createPath( 0,0.5, 0,9.5, 5,5 ) );
+			g.fill( FlatUIUtils.createPath( 0,0.5, 5,5, 0,9.5 ) );
 		}
 	}
 
 	private Color getArrowColor( Component c ) {
-		if( c instanceof JMenu && ((JMenu)c).isSelected() )
+		if( c instanceof JMenu && ((JMenu)c).isSelected() && !isUnderlineSelection() )
 			return selectionForeground;
 
 		return c.isEnabled() ? arrowColor : disabledArrowColor;
 	}
+
+	private boolean isUnderlineSelection() {
+		// not storing value of "MenuItem.selectionType" in class to allow changing at runtime
+		return "underline".equals( UIManager.getString( "MenuItem.selectionType" ) );
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatOptionPaneAbstractIcon.java

@@ -22,11 +22,12 @@ import java.awt.Graphics2D;
 import java.awt.Shape;
 import java.awt.geom.Path2D;
 import javax.swing.UIManager;
+import com.formdev.flatlaf.ui.FlatUIUtils;
 
 /**
  * Base class for icons for {@link javax.swing.JOptionPane}.
  *
- * @uiDefault OptionPane.icon.foreground			Color
+ * @uiDefault OptionPane.icon.foreground			Color	default is transparent
  *
  * @author Karl Tauber
  */
@@ -35,8 +36,8 @@ public abstract class FlatOptionPaneAbstractIcon
 {
 	protected final Color foreground = UIManager.getColor( "OptionPane.icon.foreground" );
 
-	protected FlatOptionPaneAbstractIcon( String colorKey ) {
-		super( 32, 32, UIManager.getColor( colorKey ) );
+	protected FlatOptionPaneAbstractIcon( String colorKey, String defaultColorKey ) {
+		super( 32, 32, FlatUIUtils.getUIColor( colorKey, defaultColorKey ) );
 	}
 
 	@Override

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatOptionPaneErrorIcon.java

@@ -24,7 +24,8 @@ import java.awt.geom.Rectangle2D;
 /**
  * "Error" icon for {@link javax.swing.JOptionPane}.
  *
- * @uiDefault OptionPane.icon.errorColor			Color
+ * @uiDefault OptionPane.icon.errorColor			Color	optional; defaults to Actions.Red
+ * @uiDefault Actions.Red							Color
  *
  * @author Karl Tauber
  */
@@ -32,7 +33,7 @@ public class FlatOptionPaneErrorIcon
 	extends FlatOptionPaneAbstractIcon
 {
 	public FlatOptionPaneErrorIcon() {
-		super( "OptionPane.icon.errorColor" );
+		super( "OptionPane.icon.errorColor", "Actions.Red" );
 	}
 
 	/*

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatOptionPaneInformationIcon.java

@@ -24,7 +24,8 @@ import java.awt.geom.Rectangle2D;
 /**
  * "Information" icon for {@link javax.swing.JOptionPane}.
  *
- * @uiDefault OptionPane.icon.informationColor		Color
+ * @uiDefault OptionPane.icon.informationColor		Color	optional; defaults to Actions.Blue
+ * @uiDefault Actions.Blue							Color
  *
  * @author Karl Tauber
  */
@@ -32,7 +33,7 @@ public class FlatOptionPaneInformationIcon
 	extends FlatOptionPaneAbstractIcon
 {
 	public FlatOptionPaneInformationIcon() {
-		super( "OptionPane.icon.informationColor" );
+		super( "OptionPane.icon.informationColor", "Actions.Blue" );
 	}
 
 	/*

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatOptionPaneQuestionIcon.java

@@ -24,7 +24,8 @@ import java.awt.geom.Rectangle2D;
 /**
  * "Question" icon for {@link javax.swing.JOptionPane}.
  *
- * @uiDefault OptionPane.icon.questionColor			Color
+ * @uiDefault OptionPane.icon.questionColor			Color	optional; defaults to Actions.Blue
+ * @uiDefault Actions.Blue							Color
  *
  * @author Karl Tauber
  */
@@ -32,7 +33,7 @@ public class FlatOptionPaneQuestionIcon
 	extends FlatOptionPaneAbstractIcon
 {
 	public FlatOptionPaneQuestionIcon() {
-		super( "OptionPane.icon.questionColor" );
+		super( "OptionPane.icon.questionColor", "Actions.Blue" );
 	}
 
 	/*

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatOptionPaneWarningIcon.java

@@ -24,7 +24,8 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 /**
  * "Warning" icon for {@link javax.swing.JOptionPane}.
  *
- * @uiDefault OptionPane.icon.warningColor			Color
+ * @uiDefault OptionPane.icon.warningColor			Color	optional; defaults to Actions.Yellow
+ * @uiDefault Actions.Yellow						Color
  *
  * @author Karl Tauber
  */
@@ -32,7 +33,7 @@ public class FlatOptionPaneWarningIcon
 	extends FlatOptionPaneAbstractIcon
 {
 	public FlatOptionPaneWarningIcon() {
-		super( "OptionPane.icon.warningColor" );
+		super( "OptionPane.icon.warningColor", "Actions.Yellow" );
 	}
 
 	/*

flatlaf-core/src/main/java/com/formdev/flatlaf/json/Json.java

@@ -0,0 +1,100 @@
+/*
+ * Copyright 2019 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.json;
+
+import java.io.IOException;
+import java.io.Reader;
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * @author Karl Tauber
+ */
+public class Json
+{
+	public static Object parse( Reader reader )
+		throws IOException, ParseException
+	{
+		DefaultHandler handler = new DefaultHandler();
+		new JsonParser( handler ).parse( reader );
+		return handler.getValue();
+	}
+
+	//---- class DefaultHandler -----------------------------------------------
+
+	static class DefaultHandler
+		extends JsonHandler<List<Object>, Map<String, Object>>
+	{
+		private Object value;
+
+		@Override
+		public List<Object> startArray() {
+			return new ArrayList<>();
+		}
+
+		@Override
+		public Map<String, Object> startObject() {
+			return new LinkedHashMap<>();
+		}
+
+		@Override
+		public void endNull() {
+			value = "null";
+		}
+
+		@Override
+		public void endBoolean( boolean bool ) {
+			value = bool ? "true" : "false";
+		}
+
+		@Override
+		public void endString( String string ) {
+			value = string;
+		}
+
+		@Override
+		public void endNumber( String string ) {
+			value = string;
+		}
+
+		@Override
+		public void endArray( List<Object> array ) {
+			value = array;
+		}
+
+		@Override
+		public void endObject( Map<String, Object> object ) {
+			value = object;
+		}
+
+		@Override
+		public void endArrayValue( List<Object> array ) {
+			array.add( value );
+		}
+
+		@Override
+		public void endObjectValue( Map<String, Object> object, String name ) {
+			object.put( name, value );
+		}
+
+		Object getValue() {
+			return value;
+		}
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/json/JsonHandler.java

@@ -0,0 +1,266 @@
+/*******************************************************************************
+ * Copyright (c) 2016 EclipseSource.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ ******************************************************************************/
+
+// from https://github.com/ralfstx/minimal-json
+
+package com.formdev.flatlaf.json;
+
+
+/**
+ * A handler for parser events. Instances of this class can be given to a {@link JsonParser}. The
+ * parser will then call the methods of the given handler while reading the input.
+ * <p>
+ * The default implementations of these methods do nothing. Subclasses may override only those
+ * methods they are interested in. They can use <code>getLocation()</code> to access the current
+ * character position of the parser at any point. The <code>start*</code> methods will be called
+ * while the location points to the first character of the parsed element. The <code>end*</code>
+ * methods will be called while the location points to the character position that directly follows
+ * the last character of the parsed element. Example:
+ * </p>
+ *
+ * <pre>
+ * ["lorem ipsum"]
+ *  ^            ^
+ *  startString  endString
+ * </pre>
+ * <p>
+ * Subclasses that build an object representation of the parsed JSON can return arbitrary handler
+ * objects for JSON arrays and JSON objects in {@link #startArray()} and {@link #startObject()}.
+ * These handler objects will then be provided in all subsequent parser events for this particular
+ * array or object. They can be used to keep track the elements of a JSON array or object.
+ * </p>
+ *
+ * @param <A>
+ *          The type of handlers used for JSON arrays
+ * @param <O>
+ *          The type of handlers used for JSON objects
+ * @see JsonParser
+ */
+abstract class JsonHandler<A, O> {
+
+  JsonParser parser;
+
+  /**
+   * Returns the current parser location.
+   *
+   * @return the current parser location
+   */
+  protected Location getLocation() {
+    return parser.getLocation();
+  }
+
+  /**
+   * Indicates the beginning of a <code>null</code> literal in the JSON input. This method will be
+   * called when reading the first character of the literal.
+   */
+  public void startNull() {
+  }
+
+  /**
+   * Indicates the end of a <code>null</code> literal in the JSON input. This method will be called
+   * after reading the last character of the literal.
+   */
+  public void endNull() {
+  }
+
+  /**
+   * Indicates the beginning of a boolean literal (<code>true</code> or <code>false</code>) in the
+   * JSON input. This method will be called when reading the first character of the literal.
+   */
+  public void startBoolean() {
+  }
+
+  /**
+   * Indicates the end of a boolean literal (<code>true</code> or <code>false</code>) in the JSON
+   * input. This method will be called after reading the last character of the literal.
+   *
+   * @param value
+   *          the parsed boolean value
+   */
+  public void endBoolean(boolean value) {
+  }
+
+  /**
+   * Indicates the beginning of a string in the JSON input. This method will be called when reading
+   * the opening double quote character (<code>'&quot;'</code>).
+   */
+  public void startString() {
+  }
+
+  /**
+   * Indicates the end of a string in the JSON input. This method will be called after reading the
+   * closing double quote character (<code>'&quot;'</code>).
+   *
+   * @param string
+   *          the parsed string
+   */
+  public void endString(String string) {
+  }
+
+  /**
+   * Indicates the beginning of a number in the JSON input. This method will be called when reading
+   * the first character of the number.
+   */
+  public void startNumber() {
+  }
+
+  /**
+   * Indicates the end of a number in the JSON input. This method will be called after reading the
+   * last character of the number.
+   *
+   * @param string
+   *          the parsed number string
+   */
+  public void endNumber(String string) {
+  }
+
+  /**
+   * Indicates the beginning of an array in the JSON input. This method will be called when reading
+   * the opening square bracket character (<code>'['</code>).
+   * <p>
+   * This method may return an object to handle subsequent parser events for this array. This array
+   * handler will then be provided in all calls to {@link #startArrayValue(Object)
+   * startArrayValue()}, {@link #endArrayValue(Object) endArrayValue()}, and
+   * {@link #endArray(Object) endArray()} for this array.
+   * </p>
+   *
+   * @return a handler for this array, or <code>null</code> if not needed
+   */
+  public A startArray() {
+    return null;
+  }
+
+  /**
+   * Indicates the end of an array in the JSON input. This method will be called after reading the
+   * closing square bracket character (<code>']'</code>).
+   *
+   * @param array
+   *          the array handler returned from {@link #startArray()}, or <code>null</code> if not
+   *          provided
+   */
+  public void endArray(A array) {
+  }
+
+  /**
+   * Indicates the beginning of an array element in the JSON input. This method will be called when
+   * reading the first character of the element, just before the call to the <code>start</code>
+   * method for the specific element type ({@link #startString()}, {@link #startNumber()}, etc.).
+   *
+   * @param array
+   *          the array handler returned from {@link #startArray()}, or <code>null</code> if not
+   *          provided
+   */
+  public void startArrayValue(A array) {
+  }
+
+  /**
+   * Indicates the end of an array element in the JSON input. This method will be called after
+   * reading the last character of the element value, just after the <code>end</code> method for the
+   * specific element type (like {@link #endString(String) endString()}, {@link #endNumber(String)
+   * endNumber()}, etc.).
+   *
+   * @param array
+   *          the array handler returned from {@link #startArray()}, or <code>null</code> if not
+   *          provided
+   */
+  public void endArrayValue(A array) {
+  }
+
+  /**
+   * Indicates the beginning of an object in the JSON input. This method will be called when reading
+   * the opening curly bracket character (<code>'{'</code>).
+   * <p>
+   * This method may return an object to handle subsequent parser events for this object. This
+   * object handler will be provided in all calls to {@link #startObjectName(Object)
+   * startObjectName()}, {@link #endObjectName(Object, String) endObjectName()},
+   * {@link #startObjectValue(Object, String) startObjectValue()},
+   * {@link #endObjectValue(Object, String) endObjectValue()}, and {@link #endObject(Object)
+   * endObject()} for this object.
+   * </p>
+   *
+   * @return a handler for this object, or <code>null</code> if not needed
+   */
+  public O startObject() {
+    return null;
+  }
+
+  /**
+   * Indicates the end of an object in the JSON input. This method will be called after reading the
+   * closing curly bracket character (<code>'}'</code>).
+   *
+   * @param object
+   *          the object handler returned from {@link #startObject()}, or null if not provided
+   */
+  public void endObject(O object) {
+  }
+
+  /**
+   * Indicates the beginning of the name of an object member in the JSON input. This method will be
+   * called when reading the opening quote character ('&quot;') of the member name.
+   *
+   * @param object
+   *          the object handler returned from {@link #startObject()}, or <code>null</code> if not
+   *          provided
+   */
+  public void startObjectName(O object) {
+  }
+
+  /**
+   * Indicates the end of an object member name in the JSON input. This method will be called after
+   * reading the closing quote character (<code>'"'</code>) of the member name.
+   *
+   * @param object
+   *          the object handler returned from {@link #startObject()}, or null if not provided
+   * @param name
+   *          the parsed member name
+   */
+  public void endObjectName(O object, String name) {
+  }
+
+  /**
+   * Indicates the beginning of the name of an object member in the JSON input. This method will be
+   * called when reading the opening quote character ('&quot;') of the member name.
+   *
+   * @param object
+   *          the object handler returned from {@link #startObject()}, or <code>null</code> if not
+   *          provided
+   * @param name
+   *          the member name
+   */
+  public void startObjectValue(O object, String name) {
+  }
+
+  /**
+   * Indicates the end of an object member value in the JSON input. This method will be called after
+   * reading the last character of the member value, just after the <code>end</code> method for the
+   * specific member type (like {@link #endString(String) endString()}, {@link #endNumber(String)
+   * endNumber()}, etc.).
+   *
+   * @param object
+   *          the object handler returned from {@link #startObject()}, or null if not provided
+   * @param name
+   *          the parsed member name
+   */
+  public void endObjectValue(O object, String name) {
+  }
+
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/json/JsonParser.java

@@ -0,0 +1,514 @@
+/*******************************************************************************
+ * Copyright (c) 2013, 2016 EclipseSource.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ ******************************************************************************/
+
+// from https://github.com/ralfstx/minimal-json
+
+package com.formdev.flatlaf.json;
+
+import java.io.IOException;
+import java.io.Reader;
+import java.io.StringReader;
+
+
+/**
+ * A streaming parser for JSON text. The parser reports all events to a given handler.
+ */
+class JsonParser {
+
+  private static final int MAX_NESTING_LEVEL = 1000;
+  private static final int MIN_BUFFER_SIZE = 10;
+  private static final int DEFAULT_BUFFER_SIZE = 1024;
+
+  private final JsonHandler<Object, Object> handler;
+  private Reader reader;
+  private char[] buffer;
+  private int bufferOffset;
+  private int index;
+  private int fill;
+  private int line;
+  private int lineOffset;
+  private int current;
+  private StringBuilder captureBuffer;
+  private int captureStart;
+  private int nestingLevel;
+
+  /*
+   * |                      bufferOffset
+   *                        v
+   * [a|b|c|d|e|f|g|h|i|j|k|l|m|n|o|p|q|r|s|t]        < input
+   *                       [l|m|n|o|p|q|r|s|t|?|?]    < buffer
+   *                          ^               ^
+   *                       |  index           fill
+   */
+
+  /**
+   * Creates a new JsonParser with the given handler. The parser will report all parser events to
+   * this handler.
+   *
+   * @param handler
+   *          the handler to process parser events
+   */
+  @SuppressWarnings("unchecked")
+  public JsonParser(JsonHandler<?, ?> handler) {
+    if (handler == null) {
+      throw new NullPointerException("handler is null");
+    }
+    this.handler = (JsonHandler<Object, Object>)handler;
+    handler.parser = this;
+  }
+
+  /**
+   * Parses the given input string. The input must contain a valid JSON value, optionally padded
+   * with whitespace.
+   *
+   * @param string
+   *          the input string, must be valid JSON
+   * @throws ParseException
+   *           if the input is not valid JSON
+   */
+  public void parse(String string) {
+    if (string == null) {
+      throw new NullPointerException("string is null");
+    }
+    int bufferSize = Math.max(MIN_BUFFER_SIZE, Math.min(DEFAULT_BUFFER_SIZE, string.length()));
+    try {
+      parse(new StringReader(string), bufferSize);
+    } catch (IOException exception) {
+      // StringReader does not throw IOException
+      throw new RuntimeException(exception);
+    }
+  }
+
+  /**
+   * Reads the entire input from the given reader and parses it as JSON. The input must contain a
+   * valid JSON value, optionally padded with whitespace.
+   * <p>
+   * Characters are read in chunks into a default-sized input buffer. Hence, wrapping a reader in an
+   * additional <code>BufferedReader</code> likely won't improve reading performance.
+   * </p>
+   *
+   * @param reader
+   *          the reader to read the input from
+   * @throws IOException
+   *           if an I/O error occurs in the reader
+   * @throws ParseException
+   *           if the input is not valid JSON
+   */
+  public void parse(Reader reader) throws IOException {
+    parse(reader, DEFAULT_BUFFER_SIZE);
+  }
+
+  /**
+   * Reads the entire input from the given reader and parses it as JSON. The input must contain a
+   * valid JSON value, optionally padded with whitespace.
+   * <p>
+   * Characters are read in chunks into an input buffer of the given size. Hence, wrapping a reader
+   * in an additional <code>BufferedReader</code> likely won't improve reading performance.
+   * </p>
+   *
+   * @param reader
+   *          the reader to read the input from
+   * @param buffersize
+   *          the size of the input buffer in chars
+   * @throws IOException
+   *           if an I/O error occurs in the reader
+   * @throws ParseException
+   *           if the input is not valid JSON
+   */
+  public void parse(Reader reader, int buffersize) throws IOException {
+    if (reader == null) {
+      throw new NullPointerException("reader is null");
+    }
+    if (buffersize <= 0) {
+      throw new IllegalArgumentException("buffersize is zero or negative");
+    }
+    this.reader = reader;
+    buffer = new char[buffersize];
+    bufferOffset = 0;
+    index = 0;
+    fill = 0;
+    line = 1;
+    lineOffset = 0;
+    current = 0;
+    captureStart = -1;
+    read();
+    skipWhiteSpace();
+    readValue();
+    skipWhiteSpace();
+    if (!isEndOfText()) {
+      throw error("Unexpected character");
+    }
+  }
+
+  private void readValue() throws IOException {
+    switch (current) {
+      case 'n':
+        readNull();
+        break;
+      case 't':
+        readTrue();
+        break;
+      case 'f':
+        readFalse();
+        break;
+      case '"':
+        readString();
+        break;
+      case '[':
+        readArray();
+        break;
+      case '{':
+        readObject();
+        break;
+      case '-':
+      case '0':
+      case '1':
+      case '2':
+      case '3':
+      case '4':
+      case '5':
+      case '6':
+      case '7':
+      case '8':
+      case '9':
+        readNumber();
+        break;
+      default:
+        throw expected("value");
+    }
+  }
+
+  private void readArray() throws IOException {
+    Object array = handler.startArray();
+    read();
+    if (++nestingLevel > MAX_NESTING_LEVEL) {
+      throw error("Nesting too deep");
+    }
+    skipWhiteSpace();
+    if (readChar(']')) {
+      nestingLevel--;
+      handler.endArray(array);
+      return;
+    }
+    do {
+      skipWhiteSpace();
+      handler.startArrayValue(array);
+      readValue();
+      handler.endArrayValue(array);
+      skipWhiteSpace();
+    } while (readChar(','));
+    if (!readChar(']')) {
+      throw expected("',' or ']'");
+    }
+    nestingLevel--;
+    handler.endArray(array);
+  }
+
+  private void readObject() throws IOException {
+    Object object = handler.startObject();
+    read();
+    if (++nestingLevel > MAX_NESTING_LEVEL) {
+      throw error("Nesting too deep");
+    }
+    skipWhiteSpace();
+    if (readChar('}')) {
+      nestingLevel--;
+      handler.endObject(object);
+      return;
+    }
+    do {
+      skipWhiteSpace();
+      handler.startObjectName(object);
+      String name = readName();
+      handler.endObjectName(object, name);
+      skipWhiteSpace();
+      if (!readChar(':')) {
+        throw expected("':'");
+      }
+      skipWhiteSpace();
+      handler.startObjectValue(object, name);
+      readValue();
+      handler.endObjectValue(object, name);
+      skipWhiteSpace();
+    } while (readChar(','));
+    if (!readChar('}')) {
+      throw expected("',' or '}'");
+    }
+    nestingLevel--;
+    handler.endObject(object);
+  }
+
+  private String readName() throws IOException {
+    if (current != '"') {
+      throw expected("name");
+    }
+    return readStringInternal();
+  }
+
+  private void readNull() throws IOException {
+    handler.startNull();
+    read();
+    readRequiredChar('u');
+    readRequiredChar('l');
+    readRequiredChar('l');
+    handler.endNull();
+  }
+
+  private void readTrue() throws IOException {
+    handler.startBoolean();
+    read();
+    readRequiredChar('r');
+    readRequiredChar('u');
+    readRequiredChar('e');
+    handler.endBoolean(true);
+  }
+
+  private void readFalse() throws IOException {
+    handler.startBoolean();
+    read();
+    readRequiredChar('a');
+    readRequiredChar('l');
+    readRequiredChar('s');
+    readRequiredChar('e');
+    handler.endBoolean(false);
+  }
+
+  private void readRequiredChar(char ch) throws IOException {
+    if (!readChar(ch)) {
+      throw expected("'" + ch + "'");
+    }
+  }
+
+  private void readString() throws IOException {
+    handler.startString();
+    handler.endString(readStringInternal());
+  }
+
+  private String readStringInternal() throws IOException {
+    read();
+    startCapture();
+    while (current != '"') {
+      if (current == '\\') {
+        pauseCapture();
+        readEscape();
+        startCapture();
+      } else if (current < 0x20) {
+        throw expected("valid string character");
+      } else {
+        read();
+      }
+    }
+    String string = endCapture();
+    read();
+    return string;
+  }
+
+  private void readEscape() throws IOException {
+    read();
+    switch (current) {
+      case '"':
+      case '/':
+      case '\\':
+        captureBuffer.append((char)current);
+        break;
+      case 'b':
+        captureBuffer.append('\b');
+        break;
+      case 'f':
+        captureBuffer.append('\f');
+        break;
+      case 'n':
+        captureBuffer.append('\n');
+        break;
+      case 'r':
+        captureBuffer.append('\r');
+        break;
+      case 't':
+        captureBuffer.append('\t');
+        break;
+      case 'u':
+        char[] hexChars = new char[4];
+        for (int i = 0; i < 4; i++) {
+          read();
+          if (!isHexDigit()) {
+            throw expected("hexadecimal digit");
+          }
+          hexChars[i] = (char)current;
+        }
+        captureBuffer.append((char)Integer.parseInt(new String(hexChars), 16));
+        break;
+      default:
+        throw expected("valid escape sequence");
+    }
+    read();
+  }
+
+  private void readNumber() throws IOException {
+    handler.startNumber();
+    startCapture();
+    readChar('-');
+    int firstDigit = current;
+    if (!readDigit()) {
+      throw expected("digit");
+    }
+    if (firstDigit != '0') {
+      while (readDigit()) {
+      }
+    }
+    readFraction();
+    readExponent();
+    handler.endNumber(endCapture());
+  }
+
+  private boolean readFraction() throws IOException {
+    if (!readChar('.')) {
+      return false;
+    }
+    if (!readDigit()) {
+      throw expected("digit");
+    }
+    while (readDigit()) {
+    }
+    return true;
+  }
+
+  private boolean readExponent() throws IOException {
+    if (!readChar('e') && !readChar('E')) {
+      return false;
+    }
+    if (!readChar('+')) {
+      readChar('-');
+    }
+    if (!readDigit()) {
+      throw expected("digit");
+    }
+    while (readDigit()) {
+    }
+    return true;
+  }
+
+  private boolean readChar(char ch) throws IOException {
+    if (current != ch) {
+      return false;
+    }
+    read();
+    return true;
+  }
+
+  private boolean readDigit() throws IOException {
+    if (!isDigit()) {
+      return false;
+    }
+    read();
+    return true;
+  }
+
+  private void skipWhiteSpace() throws IOException {
+    while (isWhiteSpace()) {
+      read();
+    }
+  }
+
+  private void read() throws IOException {
+    if (index == fill) {
+      if (captureStart != -1) {
+        captureBuffer.append(buffer, captureStart, fill - captureStart);
+        captureStart = 0;
+      }
+      bufferOffset += fill;
+      fill = reader.read(buffer, 0, buffer.length);
+      index = 0;
+      if (fill == -1) {
+        current = -1;
+        index++;
+        return;
+      }
+    }
+    if (current == '\n') {
+      line++;
+      lineOffset = bufferOffset + index;
+    }
+    current = buffer[index++];
+  }
+
+  private void startCapture() {
+    if (captureBuffer == null) {
+      captureBuffer = new StringBuilder();
+    }
+    captureStart = index - 1;
+  }
+
+  private void pauseCapture() {
+    int end = current == -1 ? index : index - 1;
+    captureBuffer.append(buffer, captureStart, end - captureStart);
+    captureStart = -1;
+  }
+
+  private String endCapture() {
+    int start = captureStart;
+    int end = index - 1;
+    captureStart = -1;
+    if (captureBuffer.length() > 0) {
+      captureBuffer.append(buffer, start, end - start);
+      String captured = captureBuffer.toString();
+      captureBuffer.setLength(0);
+      return captured;
+    }
+    return new String(buffer, start, end - start);
+  }
+
+  Location getLocation() {
+    int offset = bufferOffset + index - 1;
+    int column = offset - lineOffset + 1;
+    return new Location(offset, line, column);
+  }
+
+  private ParseException expected(String expected) {
+    if (isEndOfText()) {
+      return error("Unexpected end of input");
+    }
+    return error("Expected " + expected);
+  }
+
+  private ParseException error(String message) {
+    return new ParseException(message, getLocation());
+  }
+
+  private boolean isWhiteSpace() {
+    return current == ' ' || current == '\t' || current == '\n' || current == '\r';
+  }
+
+  private boolean isDigit() {
+    return current >= '0' && current <= '9';
+  }
+
+  private boolean isHexDigit() {
+    return current >= '0' && current <= '9'
+        || current >= 'a' && current <= 'f'
+        || current >= 'A' && current <= 'F';
+  }
+
+  private boolean isEndOfText() {
+    return current == -1;
+  }
+
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/json/Location.java

@@ -0,0 +1,79 @@
+/*******************************************************************************
+ * Copyright (c) 2016 EclipseSource.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ ******************************************************************************/
+
+// from https://github.com/ralfstx/minimal-json
+
+package com.formdev.flatlaf.json;
+
+
+/**
+ * An immutable object that represents a location in the parsed text.
+ */
+public class Location {
+
+  /**
+   * The absolute character index, starting at 0.
+   */
+  public final int offset;
+
+  /**
+   * The line number, starting at 1.
+   */
+  public final int line;
+
+  /**
+   * The column number, starting at 1.
+   */
+  public final int column;
+
+  Location(int offset, int line, int column) {
+    this.offset = offset;
+    this.column = column;
+    this.line = line;
+  }
+
+  @Override
+  public String toString() {
+    return line + ":" + column;
+  }
+
+  @Override
+  public int hashCode() {
+    return offset;
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    if (this == obj) {
+      return true;
+    }
+    if (obj == null) {
+      return false;
+    }
+    if (getClass() != obj.getClass()) {
+      return false;
+    }
+    Location other = (Location)obj;
+    return offset == other.offset && column == other.column && line == other.line;
+  }
+
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/json/ParseException.java

@@ -0,0 +1,83 @@
+/*******************************************************************************
+ * Copyright (c) 2013, 2016 EclipseSource.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ ******************************************************************************/
+
+// from https://github.com/ralfstx/minimal-json
+
+package com.formdev.flatlaf.json;
+
+/**
+ * An unchecked exception to indicate that an input does not qualify as valid JSON.
+ */
+public class ParseException extends RuntimeException {
+
+  private final Location location;
+
+  ParseException(String message, Location location) {
+    super(message + " at " + location);
+    this.location = location;
+  }
+
+  /**
+   * Returns the location at which the error occurred.
+   *
+   * @return the error location
+   */
+  public Location getLocation() {
+    return location;
+  }
+
+  /**
+   * Returns the absolute character index at which the error occurred. The offset of the first
+   * character of a document is 0.
+   *
+   * @return the character offset at which the error occurred, will be >= 0
+   * @deprecated Use {@link #getLocation()} instead
+   */
+  @Deprecated
+  public int getOffset() {
+    return location.offset;
+  }
+
+  /**
+   * Returns the line number in which the error occurred. The number of the first line is 1.
+   *
+   * @return the line in which the error occurred, will be >= 1
+   * @deprecated Use {@link #getLocation()} instead
+   */
+  @Deprecated
+  public int getLine() {
+    return location.line;
+  }
+
+  /**
+   * Returns the column number at which the error occurred, i.e. the number of the character in its
+   * line. The number of the first character of a line is 1.
+   *
+   * @return the column in which the error occurred, will be >= 1
+   * @deprecated Use {@link #getLocation()} instead
+   */
+  @Deprecated
+  public int getColumn() {
+    return location.column;
+  }
+
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatArrowButton.java

@@ -19,6 +19,7 @@ package com.formdev.flatlaf.ui;
 import static com.formdev.flatlaf.util.UIScale.scale;
 import java.awt.BasicStroke;
 import java.awt.Color;
+import java.awt.Container;
 import java.awt.Dimension;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
@@ -26,6 +27,7 @@ import java.awt.Shape;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
 import java.awt.geom.Path2D;
+import javax.swing.JComponent;
 import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicArrowButton;
 
@@ -38,12 +40,15 @@ public class FlatArrowButton
 	extends BasicArrowButton
 	implements UIResource
 {
+	public static final int DEFAULT_ARROW_WIDTH = 8;
+
 	private final boolean chevron;
 	private final Color foreground;
 	private final Color disabledForeground;
 	private final Color hoverForeground;
 	private final Color hoverBackground;
 
+	private int arrowWidth = DEFAULT_ARROW_WIDTH;
 	private int xOffset = 0;
 	private int yOffset = 0;
 
@@ -80,6 +85,14 @@ public class FlatArrowButton
 		}
 	}
 
+	public int getArrowWidth() {
+		return arrowWidth;
+	}
+
+	public void setArrowWidth( int arrowWidth ) {
+		this.arrowWidth = arrowWidth;
+	}
+
 	protected boolean isHover() {
 		return hover;
 	}
@@ -100,6 +113,10 @@ public class FlatArrowButton
 		this.yOffset = yOffset;
 	}
 
+	protected Color deriveHoverBackground( Color hoverBackground ) {
+		return hoverBackground;
+	}
+
 	@Override
 	public Dimension getPreferredSize() {
 		return scale( super.getPreferredSize() );
@@ -121,31 +138,44 @@ public class FlatArrowButton
 
 		// paint hover background
 		if( enabled && isHover() && hoverBackground != null ) {
-			g.setColor( hoverBackground );
+			g.setColor( deriveHoverBackground( hoverBackground ) );
 			g.fillRect( 0, 0, width, height );
 		}
 
 		int direction = getDirection();
 		boolean vert = (direction == NORTH || direction == SOUTH);
 
-		int w = scale( chevron ? 8 : 9 );
-		int h = scale( chevron ? 4 : 5 );
+		// compute width/height
+		int w = scale( arrowWidth + (chevron ? 0 : 1) );
+		int h = scale( (arrowWidth / 2) + (chevron ? 0 : 1) );
+
+		// rotate width/height
 		int rw = vert ? w : h;
 		int rh = vert ? h : w;
+
+		// chevron lines end 1px outside of width/height
+		if( chevron ) {
+			// add 1px to width/height for position calculation only
+			rw++;
+			rh++;
+		}
+
 		int x = Math.round( (width - rw) / 2f + scale( (float) xOffset ) );
 		int y = Math.round( (height - rh) / 2f + scale( (float) yOffset ) );
 
-		// optimization for small chevron arrows (e.g. OneTouchButtons in SplitPane)
-		if( x + rw >= width && x > 0 )
-			x--;
-		if( y + rh >= height && y > 0 )
-			y--;
+		// move arrow for round borders
+		Container parent = getParent();
+		if( vert && parent instanceof JComponent && FlatUIUtils.hasRoundBorder( (JComponent) parent ) )
+			x -= scale( parent.getComponentOrientation().isLeftToRight() ? 1 : -1 );
 
 		// paint arrow
 		g.setColor( enabled
 			? (isHover() && hoverForeground != null ? hoverForeground : foreground)
 			: disabledForeground );
 		g.translate( x, y );
+/*debug
+		debugPaint( g2, vert, rw, rh );
+debug*/
 		Shape arrowShape = createArrowShape( direction, chevron, w, h );
 		if( chevron ) {
 			g2.setStroke( new BasicStroke( scale( 1f ) ) );
@@ -166,4 +196,22 @@ public class FlatArrowButton
 			default:	return new Path2D.Float();
 		}
 	}
+
+/*debug
+	private void debugPaint( Graphics g, boolean vert, int w, int h ) {
+		Color oldColor = g.getColor();
+		g.setColor( Color.red );
+		g.drawRect( 0, 0, w - 1, h - 1 );
+
+		int xy1 = -2;
+		int xy2 = h + 1;
+		for( int i = 0; i < 20; i++ ) {
+			g.drawRect( vert ? 0 : xy1, vert ? xy1 : 0, 0, 0 );
+			g.drawRect( vert ? 0 : xy2, vert ? xy2 : 0, 0, 0 );
+			xy1 -= 2;
+			xy2 += 2;
+		}
+		g.setColor( oldColor );
+	}
+debug*/
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatBorder.java

@@ -23,6 +23,7 @@ import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.Insets;
 import java.awt.KeyboardFocusManager;
+import java.awt.Paint;
 import javax.swing.JComboBox;
 import javax.swing.JComponent;
 import javax.swing.JScrollPane;
@@ -35,6 +36,8 @@ import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 import javax.swing.plaf.basic.BasicBorders;
 import javax.swing.text.JTextComponent;
+import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.util.DerivedColor;
 
 /**
  * Border for various components (e.g. {@link javax.swing.JTextField}).
@@ -47,65 +50,119 @@ import javax.swing.text.JTextComponent;
  * {@link FlatUIUtils#paintParentBackground} to paint the empty space correctly.
  *
  * @uiDefault Component.focusWidth			int
- * @uiDefault Component.innerFocusWidth		int
+ * @uiDefault Component.innerFocusWidth		int or float
  * @uiDefault Component.focusColor			Color
  * @uiDefault Component.borderColor			Color
  * @uiDefault Component.disabledBorderColor	Color
  * @uiDefault Component.focusedBorderColor	Color
  *
+ * @uiDefault Component.error.borderColor			Color
+ * @uiDefault Component.error.focusedBorderColor	Color
+ * @uiDefault Component.warning.borderColor			Color
+ * @uiDefault Component.warning.focusedBorderColor	Color
+ * @uiDefault Component.custom.borderColor			Color
+ *
  * @author Karl Tauber
  */
 public class FlatBorder
 	extends BasicBorders.MarginBorder
 {
 	protected final int focusWidth = UIManager.getInt( "Component.focusWidth" );
-	protected final int innerFocusWidth = UIManager.getInt( "Component.innerFocusWidth" );
+	protected final float innerFocusWidth = FlatUIUtils.getUIFloat( "Component.innerFocusWidth", 0 );
+	protected final float innerOutlineWidth = FlatUIUtils.getUIFloat( "Component.innerOutlineWidth", 0 );
 	protected final Color focusColor = UIManager.getColor( "Component.focusColor" );
 	protected final Color borderColor = UIManager.getColor( "Component.borderColor" );
 	protected final Color disabledBorderColor = UIManager.getColor( "Component.disabledBorderColor" );
 	protected final Color focusedBorderColor = UIManager.getColor( "Component.focusedBorderColor" );
 
+	protected final Color errorBorderColor = UIManager.getColor( "Component.error.borderColor" );
+	protected final Color errorFocusedBorderColor = UIManager.getColor( "Component.error.focusedBorderColor" );
+	protected final Color warningBorderColor = UIManager.getColor( "Component.warning.borderColor" );
+	protected final Color warningFocusedBorderColor = UIManager.getColor( "Component.warning.focusedBorderColor" );
+	protected final Color customBorderColor = UIManager.getColor( "Component.custom.borderColor" );
+
 	@Override
 	public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
 		Graphics2D g2 = (Graphics2D) g.create();
 		try {
 			FlatUIUtils.setRenderingHints( g2 );
 
-			boolean isCellEditor = FlatUIUtils.isTableCellEditor( c );
-			float focusWidth = isCellEditor ? 0 : getFocusWidth();
-			float borderWidth = getBorderWidth( c );
-			float arc = isCellEditor ? 0 : getArc();
+			boolean isCellEditor = isTableCellEditor( c );
+			float focusWidth = isCellEditor ? 0 : scale( (float) getFocusWidth( c ) );
+			float borderWidth = scale( (float) getBorderWidth( c ) );
+			float arc = isCellEditor ? 0 : scale( (float) getArc( c ) );
+			Color outlineColor = getOutlineColor( c );
 
-			if( isFocused( c ) ) {
-				g2.setColor( getFocusColor( c ) );
-				FlatUIUtils.paintOutlineBorder( g2, x, y, width, height, focusWidth,
-					getLineWidth() + scale( (float) innerFocusWidth ), arc );
+			if( outlineColor != null || isFocused( c ) ) {
+				float innerFocusWidth = !(c instanceof JScrollPane)
+					? (outlineColor != null ? innerOutlineWidth : this.innerFocusWidth)
+					: 0;
+
+				g2.setColor( (outlineColor != null) ? outlineColor : getFocusColor( c ) );
+				FlatUIUtils.paintComponentOuterBorder( g2, x, y, width, height, focusWidth,
+					scale( (float) getLineWidth( c ) ) + scale( innerFocusWidth ), arc );
 			}
 
-			g2.setColor( getBorderColor( c ) );
-			FlatUIUtils.drawRoundRectangle( g2, x, y, width, height, focusWidth, borderWidth, arc );
+			g2.setPaint( (outlineColor != null) ? outlineColor : getBorderColor( c ) );
+			FlatUIUtils.paintComponentBorder( g2, x, y, width, height, focusWidth, borderWidth, arc );
 		} finally {
 			g2.dispose();
 		}
 	}
 
+	protected Color getOutlineColor( Component c ) {
+		if( !(c instanceof JComponent) )
+			return null;
+
+		Object outline = ((JComponent)c).getClientProperty( FlatClientProperties.OUTLINE );
+		if( outline instanceof String ) {
+			switch( (String) outline ) {
+				case FlatClientProperties.OUTLINE_ERROR:
+					return isFocused( c ) ? errorFocusedBorderColor : errorBorderColor;
+
+				case FlatClientProperties.OUTLINE_WARNING:
+					return isFocused( c ) ? warningFocusedBorderColor : warningBorderColor;
+			}
+		} else if( outline instanceof Color ) {
+			Color color = (Color) outline;
+			// use color functions to compute color for unfocused state
+			if( !isFocused( c ) && customBorderColor instanceof DerivedColor )
+				color = ((DerivedColor)customBorderColor).derive( color );
+			return color;
+		} else if( outline instanceof Color[] && ((Color[])outline).length >= 2 )
+			return ((Color[])outline)[isFocused( c ) ? 0 : 1];
+
+		return null;
+	}
+
 	protected Color getFocusColor( Component c ) {
 		return focusColor;
 	}
 
-	protected Color getBorderColor( Component c ) {
-		boolean enabled = c.isEnabled() && (!(c instanceof JTextComponent) || ((JTextComponent)c).isEditable());
-		return enabled
+	protected Paint getBorderColor( Component c ) {
+		return isEnabled( c )
 			? (isFocused( c ) ? focusedBorderColor : borderColor)
 			: disabledBorderColor;
 	}
 
+	protected boolean isEnabled( Component c ) {
+		if( c instanceof JScrollPane ) {
+			// check whether view component is disabled
+			JViewport viewport = ((JScrollPane)c).getViewport();
+			Component view = (viewport != null) ? viewport.getView() : null;
+			if( view != null && !isEnabled( view ) )
+				return false;
+		}
+
+		return c.isEnabled() && (!(c instanceof JTextComponent) || ((JTextComponent)c).isEditable());
+	}
+
 	protected boolean isFocused( Component c ) {
 		if( c instanceof JScrollPane ) {
 			JViewport viewport = ((JScrollPane)c).getViewport();
 			Component view = (viewport != null) ? viewport.getView() : null;
 			if( view != null ) {
-				if( view.hasFocus() )
+				if( FlatUIUtils.isPermanentFocusOwner( view ) )
 					return true;
 
 				if( (view instanceof JTable && ((JTable)view).isEditing()) ||
@@ -119,23 +176,31 @@ public class FlatBorder
 			return false;
 		} else if( c instanceof JComboBox && ((JComboBox<?>)c).isEditable() ) {
 			Component editorComponent = ((JComboBox<?>)c).getEditor().getEditorComponent();
-			return (editorComponent != null) ? editorComponent.hasFocus() : false;
+			return (editorComponent != null) ? FlatUIUtils.isPermanentFocusOwner( editorComponent ) : false;
 		} else if( c instanceof JSpinner ) {
+			if( FlatUIUtils.isPermanentFocusOwner( c ) )
+				return true;
+
 			JComponent editor = ((JSpinner)c).getEditor();
 			if( editor instanceof JSpinner.DefaultEditor ) {
 				JTextField textField = ((JSpinner.DefaultEditor)editor).getTextField();
 				if( textField != null )
-					return textField.hasFocus();
+					return FlatUIUtils.isPermanentFocusOwner( textField );
 			}
 			return false;
 		} else
-			return c.hasFocus();
+			return FlatUIUtils.isPermanentFocusOwner( c );
+	}
+
+	protected boolean isTableCellEditor( Component c ) {
+		return FlatUIUtils.isTableCellEditor( c );
 	}
 
 	@Override
 	public Insets getBorderInsets( Component c, Insets insets ) {
-		boolean isCellEditor = FlatUIUtils.isTableCellEditor( c );
-		float ow = (isCellEditor ? 0 : getFocusWidth()) + getLineWidth();
+		boolean isCellEditor = isTableCellEditor( c );
+		float focusWidth = isCellEditor ? 0 : scale( (float) getFocusWidth( c ) );
+		float ow = focusWidth + scale( (float) getLineWidth( c ) );
 
 		insets = super.getBorderInsets( c, insets );
 		insets.top = Math.round( scale( (float) insets.top ) + ow );
@@ -145,19 +210,33 @@ public class FlatBorder
 		return insets;
 	}
 
-	protected float getFocusWidth() {
-		return scale( (float) focusWidth );
+	/**
+	 * Returns the (unscaled) thickness of the outer focus border.
+	 */
+	protected int getFocusWidth( Component c ) {
+		return focusWidth;
 	}
 
-	protected float getLineWidth() {
-		return scale( 1f );
+	/**
+	 * Returns the (unscaled) line thickness used to compute the border insets.
+	 * This may be different to {@link #getBorderWidth}.
+	 */
+	protected int getLineWidth( Component c ) {
+		return 1;
 	}
 
-	protected float getBorderWidth( Component c ) {
-		return getLineWidth();
+	/**
+	 * Returns the (unscaled) line thickness used to paint the border.
+	 * This may be different to {@link #getLineWidth}.
+	 */
+	protected int getBorderWidth( Component c ) {
+		return getLineWidth( c );
 	}
 
-	protected float getArc() {
+	/**
+	 * Returns the (unscaled) arc diameter of the border.
+	 */
+	protected int getArc( Component c ) {
 		return 0;
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatButtonBorder.java

@@ -16,27 +16,35 @@
 
 package com.formdev.flatlaf.ui;
 
-import static com.formdev.flatlaf.util.UIScale.scale;
 import java.awt.Color;
 import java.awt.Component;
+import java.awt.GradientPaint;
 import java.awt.Graphics;
 import java.awt.Insets;
-import javax.swing.JButton;
+import java.awt.Paint;
+import javax.swing.AbstractButton;
 import javax.swing.UIManager;
 import javax.swing.plaf.UIResource;
+import com.formdev.flatlaf.util.UIScale;
 
 /**
  * Border for {@link javax.swing.JButton}.
  *
  * @uiDefault Button.borderColor				Color
+ * @uiDefault Button.startBorderColor			Color	optional; if set, a gradient paint is used and Button.borderColor is ignored
+ * @uiDefault Button.endBorderColor				Color	optional; if set, a gradient paint is used
  * @uiDefault Button.disabledBorderColor		Color
  * @uiDefault Button.focusedBorderColor			Color
  * @uiDefault Button.hoverBorderColor			Color	optional
  * @uiDefault Button.default.borderColor		Color
+ * @uiDefault Button.default.startBorderColor	Color	optional; if set, a gradient paint is used and Button.default.borderColor is ignored
+ * @uiDefault Button.default.endBorderColor		Color	optional; if set, a gradient paint is used
  * @uiDefault Button.default.hoverBorderColor	Color	optional
  * @uiDefault Button.default.focusedBorderColor	Color
  * @uiDefault Button.default.focusColor			Color
  * @uiDefault Button.default.borderWidth		int
+ * @uiDefault Button.toolbar.margin				Insets
+ * @uiDefault Button.toolbar.spacingInsets		Insets
  * @uiDefault Button.arc						int
  *
  * @author Karl Tauber
@@ -44,21 +52,28 @@ import javax.swing.plaf.UIResource;
 public class FlatButtonBorder
 	extends FlatBorder
 {
-	protected final Color borderColor = UIManager.getColor( "Button.borderColor" );
+	protected final Color borderColor = FlatUIUtils.getUIColor( "Button.startBorderColor", "Button.borderColor" );
+	protected final Color endBorderColor = UIManager.getColor( "Button.endBorderColor" );
 	protected final Color disabledBorderColor = UIManager.getColor( "Button.disabledBorderColor" );
 	protected final Color focusedBorderColor = UIManager.getColor( "Button.focusedBorderColor" );
 	protected final Color hoverBorderColor = UIManager.getColor( "Button.hoverBorderColor" );
-	protected final Color defaultBorderColor = UIManager.getColor( "Button.default.borderColor" );
+	protected final Color defaultBorderColor = FlatUIUtils.getUIColor( "Button.default.startBorderColor", "Button.default.borderColor" );
+	protected final Color defaultEndBorderColor = UIManager.getColor( "Button.default.endBorderColor" );
 	protected final Color defaultHoverBorderColor = UIManager.getColor( "Button.default.hoverBorderColor" );
 	protected final Color defaultFocusedBorderColor = UIManager.getColor( "Button.default.focusedBorderColor" );
 	protected final Color defaultFocusColor = UIManager.getColor( "Button.default.focusColor" );
 	protected final int defaultBorderWidth = UIManager.getInt( "Button.default.borderWidth" );
+	protected final Insets toolbarMargin = UIManager.getInsets( "Button.toolbar.margin" );
+	protected final Insets toolbarSpacingInsets = UIManager.getInsets( "Button.toolbar.spacingInsets" );
 	protected final int arc = UIManager.getInt( "Button.arc" );
 
 	@Override
 	public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
-		if( FlatButtonUI.isContentAreaFilled( c ) && !FlatButtonUI.isHelpButton( c ) )
-			super.paintBorder( c, g, x, y, width, height );
+		if( FlatButtonUI.isContentAreaFilled( c ) &&
+			!FlatButtonUI.isToolBarButton( c ) &&
+			!FlatButtonUI.isHelpButton( c ) &&
+			!FlatToggleButtonUI.isTabButton( c ) )
+		  super.paintBorder( c, g, x, y, width, height );
 	}
 
 	@Override
@@ -67,34 +82,62 @@ public class FlatButtonBorder
 	}
 
 	@Override
-	protected Color getBorderColor( Component c ) {
+	protected Paint getBorderColor( Component c ) {
 		boolean def = FlatButtonUI.isDefaultButton( c );
-		return FlatButtonUI.buttonStateColor( c,
+		Paint color = FlatButtonUI.buttonStateColor( c,
 			def ? defaultBorderColor : borderColor,
 			disabledBorderColor,
 			def ? defaultFocusedBorderColor : focusedBorderColor,
 			def ? defaultHoverBorderColor : hoverBorderColor,
 			null );
+
+		// change to gradient paint if start/end colors are specified
+		Color startBg = def ? defaultBorderColor : borderColor;
+		Color endBg = def ? defaultEndBorderColor : endBorderColor;
+		if( color == startBg && endBg != null && !startBg.equals( endBg ) )
+			color = new GradientPaint( 0, 0, startBg, 0, c.getHeight(), endBg );
+
+		return color;
 	}
 
 	@Override
 	public Insets getBorderInsets( Component c, Insets insets ) {
-		insets = super.getBorderInsets( c, insets );
+		if( FlatButtonUI.isToolBarButton( c ) ) {
+			// In toolbars, use button margin only if explicitly set.
+			// Otherwise use toolbar margin specified in UI defaults.
+			Insets margin = (c instanceof AbstractButton)
+				? ((AbstractButton)c).getMargin()
+				: null;
 
-		// use smaller left and right insets for icon-only buttons (so that they are square)
-		if( FlatButtonUI.isIconOnlyButton( c ) && ((JButton)c).getMargin() instanceof UIResource )
-			insets.left = insets.right = Math.min( insets.top, insets.bottom );
+			FlatUIUtils.setInsets( insets, UIScale.scale( FlatUIUtils.addInsets( toolbarSpacingInsets,
+				(margin != null && !(margin instanceof UIResource)) ? margin : toolbarMargin ) ) );
+		} else {
+			insets = super.getBorderInsets( c, insets );
+
+			// use smaller left and right insets for icon-only or single-character buttons (so that they are square)
+			if( FlatButtonUI.isIconOnlyOrSingleCharacterButton( c ) && ((AbstractButton)c).getMargin() instanceof UIResource )
+				insets.left = insets.right = Math.min( insets.top, insets.bottom );
+		}
 
 		return insets;
 	}
 
 	@Override
-	protected float getBorderWidth( Component c ) {
-		return FlatButtonUI.isDefaultButton( c ) ? scale( (float) defaultBorderWidth ) : super.getBorderWidth( c );
+	protected int getFocusWidth( Component c ) {
+		return FlatToggleButtonUI.isTabButton( c ) ? 0 : super.getFocusWidth( c );
 	}
 
 	@Override
-	protected float getArc() {
-		return scale( (float) arc );
+	protected int getBorderWidth( Component c ) {
+		return FlatButtonUI.isDefaultButton( c ) ? defaultBorderWidth : super.getBorderWidth( c );
+	}
+
+	@Override
+	protected int getArc( Component c ) {
+		switch( FlatButtonUI.getButtonType( c ) ) {
+			case FlatButtonUI.TYPE_SQUARE: return 0;
+			case FlatButtonUI.TYPE_ROUND_RECT: return Short.MAX_VALUE;
+			default: return arc;
+		}
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatButtonUI.java

@@ -23,42 +23,64 @@ import java.awt.Component;
 import java.awt.Dimension;
 import java.awt.Font;
 import java.awt.FontMetrics;
+import java.awt.GradientPaint;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
+import java.awt.Insets;
 import java.awt.Rectangle;
+import java.awt.geom.RoundRectangle2D;
+import java.beans.PropertyChangeEvent;
 import javax.swing.AbstractButton;
 import javax.swing.ButtonModel;
 import javax.swing.Icon;
 import javax.swing.JButton;
 import javax.swing.JComponent;
+import javax.swing.JToggleButton;
 import javax.swing.JToolBar;
 import javax.swing.LookAndFeel;
 import javax.swing.UIManager;
-import javax.swing.border.Border;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.UIResource;
+import javax.swing.plaf.basic.BasicButtonListener;
 import javax.swing.plaf.basic.BasicButtonUI;
 import com.formdev.flatlaf.FlatLaf;
+import com.formdev.flatlaf.util.UIScale;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JButton}.
  *
- * TODO document used UI defaults of superclass
+ * <!-- BasicButtonUI -->
+ *
+ * @uiDefault Button.font						Font
+ * @uiDefault Button.background					Color
+ * @uiDefault Button.foreground					Color
+ * @uiDefault Button.border						Border
+ * @uiDefault Button.margin						Insets
+ * @uiDefault Button.rollover					boolean
+ *
+ * <!-- FlatButtonUI -->
  *
- * @uiDefault Component.focusWidth				int
- * @uiDefault Button.arc						int
  * @uiDefault Button.minimumWidth				int
  * @uiDefault Button.iconTextGap				int
+ * @uiDefault Button.startBackground			Color	optional; if set, a gradient paint is used and Button.background is ignored
+ * @uiDefault Button.endBackground				Color	optional; if set, a gradient paint is used
  * @uiDefault Button.focusedBackground			Color	optional
  * @uiDefault Button.hoverBackground			Color	optional
  * @uiDefault Button.pressedBackground			Color	optional
  * @uiDefault Button.disabledText				Color
  * @uiDefault Button.default.background			Color
+ * @uiDefault Button.default.startBackground	Color	optional; if set, a gradient paint is used and Button.default.background is ignored
+ * @uiDefault Button.default.endBackground		Color	optional; if set, a gradient paint is used
  * @uiDefault Button.default.foreground			Color
  * @uiDefault Button.default.focusedBackground	Color	optional
  * @uiDefault Button.default.hoverBackground	Color	optional
  * @uiDefault Button.default.pressedBackground	Color	optional
  * @uiDefault Button.default.boldText			boolean
+ * @uiDefault Button.paintShadow				boolean	default is false
+ * @uiDefault Button.shadowWidth				int		default is 2
+ * @uiDefault Button.shadowColor				Color	optional
+ * @uiDefault Button.default.shadowColor		Color	optional
+ * @uiDefault Button.toolbar.spacingInsets		Insets
  * @uiDefault Button.toolbar.hoverBackground	Color
  * @uiDefault Button.toolbar.pressedBackground	Color
  *
@@ -67,23 +89,29 @@ import com.formdev.flatlaf.FlatLaf;
 public class FlatButtonUI
 	extends BasicButtonUI
 {
-	protected int focusWidth;
-	protected int arc;
 	protected int minimumWidth;
 	protected int iconTextGap;
 
+	protected Color startBackground;
+	protected Color endBackground;
 	protected Color focusedBackground;
 	protected Color hoverBackground;
 	protected Color pressedBackground;
 	protected Color disabledText;
 
 	protected Color defaultBackground;
+	protected Color defaultEndBackground;
 	protected Color defaultForeground;
 	protected Color defaultFocusedBackground;
 	protected Color defaultHoverBackground;
 	protected Color defaultPressedBackground;
 	protected boolean defaultBoldText;
 
+	protected int shadowWidth;
+	protected Color shadowColor;
+	protected Color defaultShadowColor;
+
+	protected Insets toolbarSpacingInsets;
 	protected Color toolbarHoverBackground;
 	protected Color toolbarPressedBackground;
 
@@ -106,23 +134,35 @@ public class FlatButtonUI
 		if( !defaults_initialized ) {
 			String prefix = getPropertyPrefix();
 
-			focusWidth = UIManager.getInt( "Component.focusWidth" );
-			arc = UIManager.getInt( prefix + "arc" );
 			minimumWidth = UIManager.getInt( prefix + "minimumWidth" );
 			iconTextGap = FlatUIUtils.getUIInt( prefix + "iconTextGap", 4 );
 
+			startBackground = UIManager.getColor( prefix + "startBackground" );
+			endBackground = UIManager.getColor( prefix + "endBackground" );
 			focusedBackground = UIManager.getColor( prefix + "focusedBackground" );
 			hoverBackground = UIManager.getColor( prefix + "hoverBackground" );
 			pressedBackground = UIManager.getColor( prefix + "pressedBackground" );
 			disabledText = UIManager.getColor( prefix + "disabledText" );
 
-			defaultBackground = UIManager.getColor( "Button.default.background" );
+			if( UIManager.getBoolean( "Button.paintShadow" ) ) {
+				shadowWidth = FlatUIUtils.getUIInt( "Button.shadowWidth", 2 );
+				shadowColor = UIManager.getColor( "Button.shadowColor" );
+				defaultShadowColor = UIManager.getColor( "Button.default.shadowColor" );
+			} else {
+				shadowWidth = 0;
+				shadowColor = null;
+				defaultShadowColor = null;
+			}
+
+			defaultBackground = FlatUIUtils.getUIColor( "Button.default.startBackground", "Button.default.background" );
+			defaultEndBackground = UIManager.getColor( "Button.default.endBackground" );
 			defaultForeground = UIManager.getColor( "Button.default.foreground" );
 			defaultFocusedBackground = UIManager.getColor( "Button.default.focusedBackground" );
 			defaultHoverBackground = UIManager.getColor( "Button.default.hoverBackground" );
 			defaultPressedBackground = UIManager.getColor( "Button.default.pressedBackground" );
 			defaultBoldText = UIManager.getBoolean( "Button.default.boldText" );
 
+			toolbarSpacingInsets = UIManager.getInsets( "Button.toolbar.spacingInsets" );
 			toolbarHoverBackground = UIManager.getColor( prefix + "toolbar.hoverBackground" );
 			toolbarPressedBackground = UIManager.getColor( prefix + "toolbar.pressedBackground" );
 
@@ -131,10 +171,16 @@ public class FlatButtonUI
 			defaults_initialized = true;
 		}
 
+		if( startBackground != null ) {
+			Color bg = b.getBackground();
+			if( bg == null || bg instanceof UIResource )
+				b.setBackground( startBackground );
+		}
+
 		LookAndFeel.installProperty( b, "opaque", false );
 		LookAndFeel.installProperty( b, "iconTextGap", scale( iconTextGap ) );
 
-		MigLayoutVisualPadding.install( b, focusWidth );
+		MigLayoutVisualPadding.install( b );
 	}
 
 	@Override
@@ -145,6 +191,31 @@ public class FlatButtonUI
 		defaults_initialized = false;
 	}
 
+	@Override
+	protected BasicButtonListener createButtonListener( AbstractButton b ) {
+		return new BasicButtonListener( b ) {
+			@Override
+			public void propertyChange( PropertyChangeEvent e ) {
+				super.propertyChange( e );
+				FlatButtonUI.this.propertyChange( b, e );
+			}
+		};
+	}
+
+	protected void propertyChange( AbstractButton b, PropertyChangeEvent e ) {
+		switch( e.getPropertyName() ) {
+			case MINIMUM_WIDTH:
+			case MINIMUM_HEIGHT:
+				b.revalidate();
+				break;
+
+			case BUTTON_TYPE:
+				b.revalidate();
+				b.repaint();
+				break;
+		}
+	}
+
 	static boolean isContentAreaFilled( Component c ) {
 		return !(c instanceof AbstractButton) || ((AbstractButton)c).isContentAreaFilled();
 	}
@@ -153,19 +224,38 @@ public class FlatButtonUI
 		return c instanceof JButton && ((JButton)c).isDefaultButton();
 	}
 
-	static boolean isIconOnlyButton( Component c ) {
-		String text;
-		return c instanceof JButton &&
-			((JButton)c).getIcon() != null &&
-			((text = ((JButton)c).getText()) == null || text.isEmpty());
+	/**
+	 * Returns true if the button has an icon but no text,
+	 * or it it does not have an icon and the text is either "..." or one character.
+	 */
+	static boolean isIconOnlyOrSingleCharacterButton( Component c ) {
+		if( !(c instanceof JButton) && !(c instanceof JToggleButton) )
+			return false;
+
+		Icon icon = ((AbstractButton)c).getIcon();
+		String text = ((AbstractButton)c).getText();
+		return (icon != null && (text == null || text.isEmpty())) ||
+			(icon == null && text != null && ("...".equals( text ) || text.length() == 1));
+	}
+
+	// same indices as in parameters to clientPropertyChoice()
+	static final int TYPE_OTHER = -1;
+	static final int TYPE_SQUARE = 0;
+	static final int TYPE_ROUND_RECT = 1;
+
+	static int getButtonType( Component c ) {
+		return (c instanceof AbstractButton)
+			? clientPropertyChoice( (AbstractButton) c, BUTTON_TYPE, BUTTON_TYPE_SQUARE, BUTTON_TYPE_ROUND_RECT )
+			: TYPE_OTHER;
 	}
 
 	static boolean isHelpButton( Component c ) {
 		return c instanceof JButton && clientPropertyEquals( (JButton) c, BUTTON_TYPE, BUTTON_TYPE_HELP );
 	}
 
-	static boolean isToolBarButton( JComponent c ) {
-		return c.getParent() instanceof JToolBar;
+	static boolean isToolBarButton( Component c ) {
+		return c.getParent() instanceof JToolBar ||
+			(c instanceof AbstractButton && clientPropertyEquals( (AbstractButton) c, BUTTON_TYPE, BUTTON_TYPE_TOOLBAR_BUTTON ));
 	}
 
 	@Override
@@ -179,28 +269,63 @@ public class FlatButtonUI
 			return;
 		}
 
-		if( isContentAreaFilled( c ) ) {
-			Color background = getBackground( c );
-			if( background != null ) {
-				Graphics2D g2 = (Graphics2D) g.create();
-				try {
-					FlatUIUtils.setRenderingHints( g2 );
-
-					Border border = c.getBorder();
-					float focusWidth = (border instanceof FlatBorder) ? scale( (float) this.focusWidth ) : 0;
-					float arc = (border instanceof FlatButtonBorder || isToolBarButton( c )) ? scale( (float) this.arc ) : 0;
-
-					FlatUIUtils.setColor( g2, background, isDefaultButton(c) ? defaultBackground : c.getBackground() );
-					FlatUIUtils.fillRoundRectangle( g2, 0, 0, c.getWidth(), c.getHeight(), focusWidth, arc );
-				} finally {
-					g2.dispose();
-				}
-			}
-		}
+		if( isContentAreaFilled( c ) )
+			paintBackground( g, c );
 
 		paint( g, c );
 	}
 
+	protected void paintBackground( Graphics g, JComponent c ) {
+		Color background = getBackground( c );
+		if( background != null ) {
+			Graphics2D g2 = (Graphics2D) g.create();
+			try {
+				FlatUIUtils.setRenderingHints( g2 );
+
+				boolean isToolBarButton = isToolBarButton( c );
+				float focusWidth = isToolBarButton ? 0 : FlatUIUtils.getBorderFocusWidth( c );
+				float arc = FlatUIUtils.getBorderArc( c );
+
+				boolean def = isDefaultButton( c );
+
+				int x = 0;
+				int y = 0;
+				int width = c.getWidth();
+				int height = c.getHeight();
+
+				if( isToolBarButton ) {
+					Insets spacing = UIScale.scale( toolbarSpacingInsets );
+					x += spacing.left;
+					y += spacing.top;
+					width -= spacing.left + spacing.right;
+					height -= spacing.top + spacing.bottom;
+				}
+
+				// paint shadow
+				Color shadowColor = def ? defaultShadowColor : this.shadowColor;
+				if( !isToolBarButton && shadowColor != null && shadowWidth > 0 && focusWidth > 0 &&
+					!FlatUIUtils.isPermanentFocusOwner( c ) && c.isEnabled() )
+				{
+					g2.setColor( shadowColor );
+					g2.fill( new RoundRectangle2D.Float( focusWidth, focusWidth + UIScale.scale( (float) shadowWidth ),
+						width - focusWidth * 2, height - focusWidth * 2, arc, arc ) );
+				}
+
+				// paint background
+				Color startBg = def ? defaultBackground : startBackground;
+				Color endBg = def ? defaultEndBackground : endBackground;
+				if( background == startBg && endBg != null && !startBg.equals( endBg ) )
+					g2.setPaint( new GradientPaint( 0, 0, startBg, 0, height, endBg ) );
+				else
+					g2.setColor( FlatUIUtils.deriveColor( background, def ? defaultBackground : c.getBackground() ) );
+
+				FlatUIUtils.paintComponentBackground( g2, x, y, width, height, focusWidth, arc );
+			} finally {
+				g2.dispose();
+			}
+		}
+	}
+
 	@Override
 	protected void paintText( Graphics g, AbstractButton b, Rectangle textRect, String text ) {
 		if( isHelpButton( b ) )
@@ -268,7 +393,7 @@ public class FlatButtonUI
 		if( hoverColor != null && b != null && b.getModel().isRollover() )
 			return hoverColor;
 
-		if( focusedColor != null && c.hasFocus() )
+		if( focusedColor != null && FlatUIUtils.isPermanentFocusOwner( c ) )
 			return focusedColor;
 
 		return enabledColor;
@@ -285,10 +410,20 @@ public class FlatButtonUI
 			return new Dimension( helpButtonIcon.getIconWidth(), helpButtonIcon.getIconHeight() );
 
 		Dimension prefSize = super.getPreferredSize( c );
+		if( prefSize == null )
+			return null;
 
-		// apply minimum width, if not in toolbar and not a icon-only button
-		if( !isToolBarButton( c ) && !isIconOnlyButton( c ) )
-			prefSize.width = Math.max( prefSize.width, scale( minimumWidth + (focusWidth * 2) ) );
+		// make button square if it is a single-character button
+		// or apply minimum width, if not in toolbar and not a icon-only or single-character button
+		if( isIconOnlyOrSingleCharacterButton( c ) ) {
+			// make only single-character buttons square to allow non-square icon-only buttons
+			if( ((AbstractButton)c).getIcon() == null )
+				prefSize.width = Math.max( prefSize.width, prefSize.height );
+		} else if( !isToolBarButton( c ) && c.getBorder() instanceof FlatButtonBorder ) {
+			float focusWidth = FlatUIUtils.getBorderFocusWidth( c );
+			prefSize.width = Math.max( prefSize.width, scale( FlatUIUtils.minimumWidth( c, minimumWidth ) ) + Math.round( focusWidth * 2 ) );
+			prefSize.height = Math.max( prefSize.height, scale( FlatUIUtils.minimumHeight( c, 0 ) ) + Math.round( focusWidth * 2 ) );
+		}
 
 		return prefSize;
 	}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatCaret.java

@@ -0,0 +1,128 @@
+/*
+ * Copyright 2020 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.ui;
+
+import static com.formdev.flatlaf.FlatClientProperties.*;
+import java.awt.EventQueue;
+import java.awt.event.FocusEvent;
+import java.awt.event.MouseEvent;
+import javax.swing.JFormattedTextField;
+import javax.swing.plaf.UIResource;
+import javax.swing.text.DefaultCaret;
+import javax.swing.text.Document;
+import javax.swing.text.JTextComponent;
+
+/**
+ * Caret that can select all text on focus gained.
+ *
+ * @author Karl Tauber
+ */
+class FlatCaret
+	extends DefaultCaret
+	implements UIResource
+{
+	private final String selectAllOnFocusPolicy;
+
+	private boolean wasFocused;
+	private boolean wasTemporaryLost;
+	private boolean isMousePressed;
+
+	FlatCaret( String selectAllOnFocusPolicy ) {
+		this.selectAllOnFocusPolicy = selectAllOnFocusPolicy;
+	}
+
+	@Override
+	public void install( JTextComponent c ) {
+		super.install( c );
+
+		// the dot and mark are lost when switching LaF
+		// --> move dot to end of text so that all text may be selected when it gains focus
+		Document doc = c.getDocument();
+		if( doc != null && getDot() == 0 && getMark() == 0 ) {
+			int length = doc.getLength();
+			if( length > 0 )
+				setDot( length );
+		}
+	}
+
+	@Override
+	public void focusGained( FocusEvent e ) {
+		if( !wasTemporaryLost && !isMousePressed )
+			selectAllOnFocusGained();
+		wasTemporaryLost = false;
+		wasFocused = true;
+
+		super.focusGained( e );
+	}
+
+	@Override
+	public void focusLost( FocusEvent e ) {
+		wasTemporaryLost = e.isTemporary();
+		super.focusLost( e );
+	}
+
+	@Override
+	public void mousePressed( MouseEvent e ) {
+		isMousePressed = true;
+		super.mousePressed( e );
+	}
+
+	@Override
+	public void mouseReleased( MouseEvent e ) {
+		isMousePressed = false;
+		super.mouseReleased( e );
+	}
+
+	private void selectAllOnFocusGained() {
+		JTextComponent c = getComponent();
+		Document doc = c.getDocument();
+		if( doc == null || !c.isEnabled() || !c.isEditable() )
+			return;
+
+		Object selectAllOnFocusPolicy = c.getClientProperty( SELECT_ALL_ON_FOCUS_POLICY );
+		if( selectAllOnFocusPolicy == null )
+			selectAllOnFocusPolicy = this.selectAllOnFocusPolicy;
+
+		if( SELECT_ALL_ON_FOCUS_POLICY_NEVER.equals( selectAllOnFocusPolicy ) )
+			return;
+
+		if( !SELECT_ALL_ON_FOCUS_POLICY_ALWAYS.equals( selectAllOnFocusPolicy ) ) {
+			// policy is "once" (or null or unknown)
+
+			// was already focused?
+			if( wasFocused )
+				return;
+
+			// check whether selection was modified before gaining focus
+			int dot = getDot();
+			int mark = getMark();
+			if( dot != mark || dot != doc.getLength() )
+				return;
+		}
+
+		// select all
+		if( c instanceof JFormattedTextField ) {
+			EventQueue.invokeLater( () -> {
+				setDot( 0 );
+				moveDot( doc.getLength() );
+			} );
+		} else {
+			setDot( 0 );
+			moveDot( doc.getLength() );
+		}
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatCheckBoxMenuItemUI.java

@@ -16,20 +16,47 @@
 
 package com.formdev.flatlaf.ui;
 
-import static com.formdev.flatlaf.util.UIScale.scale;
-import java.beans.PropertyChangeListener;
+import java.awt.Dimension;
+import java.awt.Graphics;
+import javax.swing.Icon;
 import javax.swing.JComponent;
+import javax.swing.LookAndFeel;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicCheckBoxMenuItemUI;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JCheckBoxMenuItem}.
  *
+ * <!-- BasicCheckBoxMenuItemUI -->
+ *
+ * @uiDefault CheckBoxMenuItem.font									Font
+ * @uiDefault CheckBoxMenuItem.background							Color
+ * @uiDefault CheckBoxMenuItem.foreground							Color
+ * @uiDefault CheckBoxMenuItem.disabledForeground					Color
+ * @uiDefault CheckBoxMenuItem.selectionBackground					Color
+ * @uiDefault CheckBoxMenuItem.selectionForeground					Color
+ * @uiDefault CheckBoxMenuItem.acceleratorForeground				Color
+ * @uiDefault CheckBoxMenuItem.acceleratorSelectionForeground		Color
+ * @uiDefault MenuItem.acceleratorFont								Font		defaults to MenuItem.font
+ * @uiDefault MenuItem.acceleratorDelimiter							String
+ * @uiDefault CheckBoxMenuItem.border								Border
+ * @uiDefault CheckBoxMenuItem.borderPainted						boolean
+ * @uiDefault CheckBoxMenuItem.margin								Insets
+ * @uiDefault CheckBoxMenuItem.arrowIcon							Icon
+ * @uiDefault CheckBoxMenuItem.checkIcon							Icon
+ * @uiDefault CheckBoxMenuItem.opaque								boolean
+ *
+ * <!-- FlatCheckBoxMenuItemUI -->
+ *
+ * @uiDefault MenuItem.iconTextGap									int
+ *
  * @author Karl Tauber
  */
 public class FlatCheckBoxMenuItemUI
 	extends BasicCheckBoxMenuItemUI
 {
+	private FlatMenuItemRenderer renderer;
+
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatCheckBoxMenuItemUI();
 	}
@@ -38,20 +65,30 @@ public class FlatCheckBoxMenuItemUI
 	protected void installDefaults() {
 		super.installDefaults();
 
-		// scale
-		defaultTextIconGap = scale( defaultTextIconGap );
+		LookAndFeel.installProperty( menuItem, "iconTextGap", FlatUIUtils.getUIInt( "MenuItem.iconTextGap", 4 ) );
+
+		renderer = createRenderer();
 	}
 
-	/**
-	 * Scale defaultTextIconGap again if iconTextGap property has changed.
-	 */
 	@Override
-	protected PropertyChangeListener createPropertyChangeListener( JComponent c ) {
-		PropertyChangeListener superListener = super.createPropertyChangeListener( c );
-		return e -> {
-			superListener.propertyChange( e );
-			if( e.getPropertyName() == "iconTextGap" )
-				defaultTextIconGap = scale( defaultTextIconGap );
-		};
+	protected void uninstallDefaults() {
+		super.uninstallDefaults();
+
+		renderer = null;
+	}
+
+	protected FlatMenuItemRenderer createRenderer() {
+		return new FlatMenuItemRenderer( menuItem, checkIcon, arrowIcon, acceleratorFont, acceleratorDelimiter );
+	}
+
+	@Override
+	protected Dimension getPreferredMenuItemSize( JComponent c, Icon checkIcon, Icon arrowIcon, int defaultTextIconGap ) {
+		return renderer.getPreferredMenuItemSize();
+	}
+
+	@Override
+	public void paint( Graphics g, JComponent c ) {
+		renderer.paintMenuItem( g, selectionBackground, selectionForeground, disabledForeground,
+			acceleratorForeground, acceleratorSelectionForeground );
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatCheckBoxUI.java

@@ -22,6 +22,21 @@ import javax.swing.plaf.ComponentUI;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JCheckBox}.
  *
+ * <!-- BasicRadioButtonUI -->
+ *
+ * @uiDefault CheckBox.font						Font
+ * @uiDefault CheckBox.background				Color
+ * @uiDefault CheckBox.foreground				Color
+ * @uiDefault CheckBox.border					Border
+ * @uiDefault CheckBox.margin					Insets
+ * @uiDefault CheckBox.rollover					boolean
+ * @uiDefault CheckBox.icon						Icon
+ *
+ * <!-- FlatRadioButtonUI -->
+ *
+ * @uiDefault CheckBox.iconTextGap				int
+ * @uiDefault CheckBox.disabledText				Color
+ *
  * @author Karl Tauber
  */
 public class FlatCheckBoxUI

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatColorChooserUI.java

@@ -16,16 +16,18 @@
 
 package com.formdev.flatlaf.ui;
 
-import java.awt.Dimension;
 import javax.swing.JComponent;
-import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicColorChooserUI;
-import com.formdev.flatlaf.util.UIScale;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JColorChooser}.
  *
+ * <!-- BasicColorChooserUI -->
+ *
+ * @uiDefault ColorChooser.font							Font
+ * @uiDefault ColorChooser.background					Color
+ * @uiDefault ColorChooser.foreground					Color
  * @uiDefault ColorChooser.showPreviewPanelText			boolean
  * @uiDefault ColorChooser.swatchesSwatchSize			Dimension
  * @uiDefault ColorChooser.swatchesRecentSwatchSize		Dimension
@@ -38,21 +40,4 @@ public class FlatColorChooserUI
 	public static ComponentUI createUI( JComponent c ) {
 		return  new FlatColorChooserUI();
 	}
-
-	@Override
-	public void installUI( JComponent c ) {
-		if( UIScale.getUserScaleFactor() != 1f ) {
-			// temporary scale swatch sizes
-			Dimension swatchSize = UIManager.getDimension( "ColorChooser.swatchesSwatchSize" );
-			Dimension swatchSize2 = UIManager.getDimension( "ColorChooser.swatchesRecentSwatchSize" );
-			UIManager.put( "ColorChooser.swatchesSwatchSize", UIScale.scale( swatchSize ) );
-			UIManager.put( "ColorChooser.swatchesRecentSwatchSize", UIScale.scale( swatchSize2 ) );
-
-			super.installUI( c );
-
-			UIManager.put( "ColorChooser.swatchesSwatchSize", null );
-			UIManager.put( "ColorChooser.swatchesRecentSwatchSize", null );
-		} else
-			super.installUI( c );
-	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatComboBoxUI.java

@@ -28,18 +28,27 @@ import java.awt.Insets;
 import java.awt.LayoutManager;
 import java.awt.Rectangle;
 import java.awt.Shape;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
 import java.awt.event.FocusEvent;
 import java.awt.event.FocusListener;
 import java.awt.event.MouseListener;
 import java.awt.geom.Rectangle2D;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
+import java.lang.ref.WeakReference;
+import javax.swing.AbstractAction;
 import javax.swing.BorderFactory;
+import javax.swing.ComboBoxEditor;
+import javax.swing.DefaultListCellRenderer;
+import javax.swing.InputMap;
 import javax.swing.JButton;
 import javax.swing.JComboBox;
 import javax.swing.JComponent;
 import javax.swing.JList;
 import javax.swing.JPanel;
+import javax.swing.JTextField;
+import javax.swing.KeyStroke;
 import javax.swing.ListCellRenderer;
 import javax.swing.LookAndFeel;
 import javax.swing.SwingConstants;
@@ -51,18 +60,31 @@ import javax.swing.plaf.basic.BasicComboBoxUI;
 import javax.swing.plaf.basic.BasicComboPopup;
 import javax.swing.plaf.basic.ComboPopup;
 import javax.swing.text.JTextComponent;
+import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.util.SystemInfo;
 import com.formdev.flatlaf.util.UIScale;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JComboBox}.
  *
- * TODO document used UI defaults of superclass
+ * <!-- BasicComboBoxUI -->
  *
- * @uiDefault Component.focusWidth				int
- * @uiDefault Component.arc						int
+ * @uiDefault ComboBox.font						Font
+ * @uiDefault ComboBox.background				Color
+ * @uiDefault ComboBox.foreground				Color
+ * @uiDefault ComboBox.border					Border
+ * @uiDefault ComboBox.padding					Insets
+ * @uiDefault ComboBox.squareButton				boolean	default is true
+ *
+ * <!-- FlatComboBoxUI -->
+ *
+ * @uiDefault ComboBox.minimumWidth				int
+ * @uiDefault ComboBox.editorColumns			int
  * @uiDefault Component.arrowType				String	triangle (default) or chevron
+ * @uiDefault Component.isIntelliJTheme			boolean
  * @uiDefault Component.borderColor				Color
  * @uiDefault Component.disabledBorderColor		Color
+ * @uiDefault ComboBox.editableBackground		Color	optional; defaults to ComboBox.background
  * @uiDefault ComboBox.disabledBackground		Color
  * @uiDefault ComboBox.disabledForeground		Color
  * @uiDefault ComboBox.buttonBackground			Color
@@ -76,12 +98,14 @@ import com.formdev.flatlaf.util.UIScale;
 public class FlatComboBoxUI
 	extends BasicComboBoxUI
 {
-	protected int focusWidth;
-	protected int arc;
+	protected int minimumWidth;
+	protected int editorColumns;
 	protected String arrowType;
+	protected boolean isIntelliJTheme;
 	protected Color borderColor;
 	protected Color disabledBorderColor;
 
+	protected Color editableBackground;
 	protected Color disabledBackground;
 	protected Color disabledForeground;
 
@@ -94,6 +118,8 @@ public class FlatComboBoxUI
 	private MouseListener hoverListener;
 	private boolean hover;
 
+	private WeakReference<Component> lastRendererComponent;
+
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatComboBoxUI();
 	}
@@ -126,12 +152,14 @@ public class FlatComboBoxUI
 
 		LookAndFeel.installProperty( comboBox, "opaque", false );
 
-		focusWidth = UIManager.getInt( "Component.focusWidth" );
-		arc = UIManager.getInt( "Component.arc" );
+		minimumWidth = UIManager.getInt( "ComboBox.minimumWidth" );
+		editorColumns = UIManager.getInt( "ComboBox.editorColumns" );
 		arrowType = UIManager.getString( "Component.arrowType" );
+		isIntelliJTheme = UIManager.getBoolean( "Component.isIntelliJTheme" );
 		borderColor = UIManager.getColor( "Component.borderColor" );
 		disabledBorderColor = UIManager.getColor( "Component.disabledBorderColor" );
 
+		editableBackground = UIManager.getColor( "ComboBox.editableBackground" );
 		disabledBackground = UIManager.getColor( "ComboBox.disabledBackground" );
 		disabledForeground = UIManager.getColor( "ComboBox.disabledForeground" );
 
@@ -144,7 +172,7 @@ public class FlatComboBoxUI
 		// scale
 		padding = UIScale.scale( padding );
 
-		MigLayoutVisualPadding.install( comboBox, focusWidth );
+		MigLayoutVisualPadding.install( comboBox );
 	}
 
 	@Override
@@ -154,6 +182,7 @@ public class FlatComboBoxUI
 		borderColor = null;
 		disabledBorderColor = null;
 
+		editableBackground = null;
 		disabledBackground = null;
 		disabledForeground = null;
 
@@ -220,7 +249,12 @@ public class FlatComboBoxUI
 				} else if( editor != null && source == comboBox && propertyName == "componentOrientation" ) {
 					ComponentOrientation o = (ComponentOrientation) e.getNewValue();
 					editor.applyComponentOrientation( o );
-				}
+				} else if( editor != null && FlatClientProperties.PLACEHOLDER_TEXT.equals( propertyName ) )
+					editor.repaint();
+				else if( FlatClientProperties.COMPONENT_ROUND_RECT.equals( propertyName ) )
+					comboBox.repaint();
+				else if( FlatClientProperties.MINIMUM_WIDTH.equals( propertyName ) )
+					comboBox.revalidate();
 			}
 		};
 	}
@@ -230,18 +264,30 @@ public class FlatComboBoxUI
 		return new FlatComboPopup( comboBox );
 	}
 
+	@Override
+	protected ComboBoxEditor createEditor() {
+		ComboBoxEditor comboBoxEditor = super.createEditor();
+
+		Component editor = comboBoxEditor.getEditorComponent();
+		if( editor instanceof JTextField ) {
+			JTextField textField = (JTextField) editor;
+			textField.setColumns( editorColumns );
+
+			// assign a non-null and non-javax.swing.plaf.UIResource border to the text field,
+			// otherwise it is replaced with default text field border when switching LaF
+			// because javax.swing.plaf.basic.BasicComboBoxEditor.BorderlessTextField.setBorder()
+			// uses "border instanceof javax.swing.plaf.basic.BasicComboBoxEditor.UIResource"
+			// instead of "border instanceof javax.swing.plaf.UIResource"
+			textField.setBorder( BorderFactory.createEmptyBorder() );
+		}
+
+		return comboBoxEditor;
+	}
+
 	@Override
 	protected void configureEditor() {
 		super.configureEditor();
 
-		// assign a non-javax.swing.plaf.UIResource border to the text field,
-		// otherwise it is replaced with default text field border when switching LaF
-		// because javax.swing.plaf.basic.BasicComboBoxEditor.BorderlessTextField.setBorder()
-		// uses "border instanceof javax.swing.plaf.basic.BasicComboBoxEditor.UIResource"
-		// instead of "border instanceof javax.swing.plaf.UIResource"
-		if( editor instanceof JTextComponent )
-			((JTextComponent)editor).setBorder( BorderFactory.createEmptyBorder() );
-
 		// explicitly make non-opaque
 		if( editor instanceof JComponent )
 			((JComponent)editor).setOpaque( false );
@@ -249,6 +295,19 @@ public class FlatComboBoxUI
 		editor.applyComponentOrientation( comboBox.getComponentOrientation() );
 
 		updateEditorColors();
+
+		// macOS
+		if( SystemInfo.IS_MAC && editor instanceof JTextComponent ) {
+			// delegate actions from editor text field to combobox, which is necessary
+			// because text field on macOS already handle those keys
+			InputMap inputMap = ((JTextComponent)editor).getInputMap();
+			new EditorDelegateAction( inputMap, KeyStroke.getKeyStroke( "UP" ) );
+			new EditorDelegateAction( inputMap, KeyStroke.getKeyStroke( "KP_UP" ) );
+			new EditorDelegateAction( inputMap, KeyStroke.getKeyStroke( "DOWN" ) );
+			new EditorDelegateAction( inputMap, KeyStroke.getKeyStroke( "KP_DOWN" ) );
+			new EditorDelegateAction( inputMap, KeyStroke.getKeyStroke( "HOME" ) );
+			new EditorDelegateAction( inputMap, KeyStroke.getKeyStroke( "END" ) );
+		}
 	}
 
 	private void updateEditorColors() {
@@ -277,8 +336,11 @@ public class FlatComboBoxUI
 
 	@Override
 	public void update( Graphics g, JComponent c ) {
+		float focusWidth = FlatUIUtils.getBorderFocusWidth( c );
+		float arc = FlatUIUtils.getBorderArc( c );
+
 		// fill background if opaque to avoid garbage if user sets opaque to true
-		if( c.isOpaque() && (focusWidth > 0 || arc != 0) )
+		if( c.isOpaque() && (focusWidth > 0 || arc > 0) )
 			FlatUIUtils.paintParentBackground( g, c );
 
 		Graphics2D g2 = (Graphics2D) g;
@@ -286,16 +348,16 @@ public class FlatComboBoxUI
 
 		int width = c.getWidth();
 		int height = c.getHeight();
-		float focusWidth = (c.getBorder() instanceof FlatBorder) ? scale( (float) this.focusWidth ) : 0;
-		float arc = (c.getBorder() instanceof FlatRoundBorder) ? scale( (float) this.arc ) : 0;
 		int arrowX = arrowButton.getX();
 		int arrowWidth = arrowButton.getWidth();
 		boolean enabled = comboBox.isEnabled();
 		boolean isLeftToRight = comboBox.getComponentOrientation().isLeftToRight();
 
 		// paint background
-		g2.setColor( enabled ? c.getBackground() : disabledBackground );
-		FlatUIUtils.fillRoundRectangle( g2, 0, 0, width, height, focusWidth, arc );
+		g2.setColor( enabled
+			? (editableBackground != null && comboBox.isEditable() ? editableBackground : c.getBackground())
+			: getDisabledBackground( comboBox ) );
+		FlatUIUtils.paintComponentBackground( g2, 0, 0, width, height, focusWidth, arc );
 
 		// paint arrow button background
 		if( enabled ) {
@@ -305,7 +367,7 @@ public class FlatComboBoxUI
 				g2.clipRect( arrowX, 0, width - arrowX, height );
 			else
 				g2.clipRect( 0, 0, arrowX + arrowWidth, height );
-			FlatUIUtils.fillRoundRectangle( g2, 0, 0, width, height, focusWidth, arc );
+			FlatUIUtils.paintComponentBackground( g2, 0, 0, width, height, focusWidth, arc );
 			g2.setClip( oldClip );
 		}
 
@@ -314,7 +376,7 @@ public class FlatComboBoxUI
 			g2.setColor( enabled ? borderColor : disabledBorderColor );
 			float lw = scale( 1f );
 			float lx = isLeftToRight ? arrowX : arrowX + arrowWidth - lw;
-			g2.fill( new Rectangle2D.Float( lx, focusWidth, lw, height - (focusWidth * 2) ) );
+			g2.fill( new Rectangle2D.Float( lx, focusWidth, lw, height - 1 - (focusWidth * 2)) );
 		}
 
 		paint( g, c );
@@ -324,15 +386,17 @@ public class FlatComboBoxUI
 	@SuppressWarnings( "unchecked" )
 	public void paintCurrentValue( Graphics g, Rectangle bounds, boolean hasFocus ) {
 		ListCellRenderer<Object> renderer = comboBox.getRenderer();
-		CellPaddingBorder.uninstall( renderer );
+		uninstallCellPaddingBorder( renderer );
+		if( renderer == null )
+			renderer = new DefaultListCellRenderer();
 		Component c = renderer.getListCellRendererComponent( listBox, comboBox.getSelectedItem(), -1, false, false );
 		c.setFont( comboBox.getFont() );
 		c.applyComponentOrientation( comboBox.getComponentOrientation() );
-		CellPaddingBorder.uninstall( c );
+		uninstallCellPaddingBorder( c );
 
 		boolean enabled = comboBox.isEnabled();
 		c.setForeground( enabled ? comboBox.getForeground() : disabledForeground );
-		c.setBackground( enabled ? comboBox.getBackground() : disabledBackground );
+		c.setBackground( enabled ? comboBox.getBackground() : getDisabledBackground( comboBox ) );
 
 		boolean shouldValidate = (c instanceof JPanel);
 		if( padding != null )
@@ -349,8 +413,54 @@ public class FlatComboBoxUI
 
 	@Override
 	public void paintCurrentValueBackground( Graphics g, Rectangle bounds, boolean hasFocus ) {
-		g.setColor( comboBox.isEnabled() ? comboBox.getBackground() : disabledBackground );
-		g.fillRect( bounds.x, bounds.y, bounds.width, bounds.height );
+		// not necessary because already painted in update()
+	}
+
+	private Color getDisabledBackground( JComponent c ) {
+		return isIntelliJTheme ? FlatUIUtils.getParentBackground( c ) : disabledBackground;
+	}
+
+	@Override
+	public Dimension getMinimumSize( JComponent c ) {
+		Dimension minimumSize = super.getMinimumSize( c );
+		minimumSize.width = Math.max( minimumSize.width, scale( FlatUIUtils.minimumWidth( c, minimumWidth ) ) );
+		return minimumSize;
+	}
+
+	@Override
+	protected Dimension getDefaultSize() {
+		@SuppressWarnings( "unchecked" )
+		ListCellRenderer<Object> renderer = comboBox.getRenderer();
+		uninstallCellPaddingBorder( renderer );
+
+		Dimension size = super.getDefaultSize();
+
+		uninstallCellPaddingBorder( renderer );
+		return size;
+	}
+
+	@Override
+	protected Dimension getDisplaySize() {
+		@SuppressWarnings( "unchecked" )
+		ListCellRenderer<Object> renderer = comboBox.getRenderer();
+		uninstallCellPaddingBorder( renderer );
+
+		Dimension displaySize = super.getDisplaySize();
+
+		// recalculate width without hardcoded 100 under special conditions
+		if( displaySize.width == 100 + padding.left + padding.right &&
+			comboBox.isEditable() &&
+			comboBox.getItemCount() == 0 &&
+			comboBox.getPrototypeDisplayValue() == null )
+		{
+			int width = getDefaultSize().width;
+			width = Math.max( width, editor.getPreferredSize().width );
+			width += padding.left + padding.right;
+			displaySize = new Dimension( width, displaySize.height );
+		}
+
+		uninstallCellPaddingBorder( renderer );
+		return displaySize;
 	}
 
 	@Override
@@ -376,15 +486,23 @@ public class FlatComboBoxUI
 		return null;
 	}
 
+	private void uninstallCellPaddingBorder( Object o ) {
+		CellPaddingBorder.uninstall( o );
+		if( lastRendererComponent != null ) {
+			CellPaddingBorder.uninstall( lastRendererComponent );
+			lastRendererComponent = null;
+		}
+	}
+
 	//---- class FlatComboPopup -----------------------------------------------
 
 	@SuppressWarnings( { "rawtypes", "unchecked" } )
-	private class FlatComboPopup
+	protected class FlatComboPopup
 		extends BasicComboPopup
 	{
 		private CellPaddingBorder paddingBorder;
 
-		FlatComboPopup( JComboBox combo ) {
+		protected FlatComboPopup( JComboBox combo ) {
 			super( combo );
 
 			// BasicComboPopup listens to JComboBox.componentOrientation and updates
@@ -399,13 +517,8 @@ public class FlatComboBoxUI
 
 		@Override
 		protected Rectangle computePopupBounds( int px, int py, int pw, int ph ) {
-			// get maximum display size of all items, ignoring prototype value
-			Object prototype = comboBox.getPrototypeDisplayValue();
-			if( prototype != null )
-				comboBox.setPrototypeDisplayValue( null );
+			// get maximum display size of all items
 			Dimension displaySize = getDisplaySize();
-			if( prototype != null )
-				comboBox.setPrototypeDisplayValue( prototype );
 
 			// make popup wider if necessary
 			if( displaySize.width > pw ) {
@@ -459,7 +572,10 @@ public class FlatComboBoxUI
 			{
 				ListCellRenderer renderer = comboBox.getRenderer();
 				CellPaddingBorder.uninstall( renderer );
+				CellPaddingBorder.uninstall( lastRendererComponent );
 
+				if( renderer == null )
+					renderer = new DefaultListCellRenderer();
 				Component c = renderer.getListCellRendererComponent( list, value, index, isSelected, cellHasFocus );
 				c.applyComponentOrientation( comboBox.getComponentOrientation() );
 
@@ -469,6 +585,8 @@ public class FlatComboBoxUI
 					paddingBorder.install( (JComponent) c );
 				}
 
+				lastRendererComponent = (c != renderer) ? new WeakReference<>( c ) : null;
+
 				return c;
 			}
 		}
@@ -503,6 +621,9 @@ public class FlatComboBoxUI
 		}
 
 		static void uninstall( Object o ) {
+			if( o instanceof WeakReference )
+				o = ((WeakReference<?>)o).get();
+
 			if( !(o instanceof JComponent) )
 				return;
 
@@ -538,4 +659,31 @@ public class FlatComboBoxUI
 				rendererBorder.paintBorder( c, g, x, y, width, height );
 		}
 	}
+
+	//---- class EditorDelegateAction -----------------------------------------
+
+	/**
+	 * Delegates actions from editor text field to combobox.
+	 */
+	private class EditorDelegateAction
+		extends AbstractAction
+	{
+		private final KeyStroke keyStroke;
+
+		EditorDelegateAction( InputMap inputMap, KeyStroke keyStroke ) {
+			this.keyStroke = keyStroke;
+
+			// add to input map
+			inputMap.put( keyStroke, this );
+		}
+
+		@Override
+		public void actionPerformed( ActionEvent e ) {
+			ActionListener action = comboBox.getActionForKeyStroke( keyStroke );
+			if( action != null ) {
+				action.actionPerformed( new ActionEvent( comboBox, e.getID(),
+					e.getActionCommand(), e.getWhen(), e.getModifiers() ) );
+			}
+		}
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatDesktopIconUI.java

@@ -0,0 +1,308 @@
+/*
+ * Copyright 2020 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.ui;
+
+import java.awt.Component;
+import java.awt.Container;
+import java.awt.Dimension;
+import java.awt.EventQueue;
+import java.awt.Graphics2D;
+import java.awt.Image;
+import java.awt.Insets;
+import java.awt.LayoutManager;
+import java.awt.Point;
+import java.awt.event.ActionListener;
+import java.awt.event.MouseEvent;
+import java.awt.image.BufferedImage;
+import java.beans.PropertyVetoException;
+import javax.swing.BorderFactory;
+import javax.swing.ImageIcon;
+import javax.swing.JButton;
+import javax.swing.JComponent;
+import javax.swing.event.MouseInputAdapter;
+import javax.swing.event.MouseInputListener;
+import javax.swing.JLabel;
+import javax.swing.JLayeredPane;
+import javax.swing.JRootPane;
+import javax.swing.JToolTip;
+import javax.swing.LookAndFeel;
+import javax.swing.SwingConstants;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.basic.BasicDesktopIconUI;
+import com.formdev.flatlaf.util.UIScale;
+
+/**
+ * Provides the Flat LaF UI delegate for {@link javax.swing.JInternalFrame.JDesktopIcon}.
+ *
+ * <!-- BasicDesktopIconUI -->
+ *
+ * @uiDefault DesktopIcon.border					Border
+ *
+ * <!-- FlatDesktopIconUI -->
+ *
+ * @uiDefault DesktopIcon.background				Color
+ * @uiDefault DesktopIcon.foreground				Color
+ * @uiDefault DesktopIcon.iconSize					Dimension
+ * @uiDefault DesktopIcon.closeSize					Dimension
+ * @uiDefault DesktopIcon.closeIcon					Icon
+ *
+ * @author Karl Tauber
+ */
+public class FlatDesktopIconUI
+	extends BasicDesktopIconUI
+{
+	private Dimension iconSize;
+	private Dimension closeSize;
+
+	private JLabel dockIcon;
+	private JButton closeButton;
+	private JToolTip titleTip;
+	private ActionListener closeListener;
+	private MouseInputListener mouseInputListener;
+
+	public static ComponentUI createUI( JComponent c ) {
+		return new FlatDesktopIconUI();
+	}
+
+	@Override
+	public void uninstallUI( JComponent c ) {
+		super.uninstallUI( c );
+
+		dockIcon = null;
+		closeButton = null;
+	}
+
+	@Override
+	protected void installComponents() {
+		dockIcon = new JLabel();
+		dockIcon.setHorizontalAlignment( SwingConstants.CENTER );
+
+		closeButton = new JButton();
+		closeButton.setIcon( UIManager.getIcon( "DesktopIcon.closeIcon" ) );
+		closeButton.setFocusable( false );
+		closeButton.setBorder( BorderFactory.createEmptyBorder() );
+		closeButton.setOpaque( true );
+		closeButton.setBackground( FlatUIUtils.nonUIResource( desktopIcon.getBackground() ) );
+		closeButton.setForeground( FlatUIUtils.nonUIResource( desktopIcon.getForeground() ) );
+		closeButton.setVisible( false );
+
+		desktopIcon.setLayout( new FlatDesktopIconLayout() );
+		desktopIcon.add( closeButton );
+		desktopIcon.add( dockIcon );
+	}
+
+	@Override
+	protected void uninstallComponents() {
+		hideTitleTip();
+
+		desktopIcon.remove( dockIcon );
+		desktopIcon.remove( closeButton );
+		desktopIcon.setLayout( null );
+	}
+
+	@Override
+	protected void installDefaults() {
+		super.installDefaults();
+
+		LookAndFeel.installColors( desktopIcon, "DesktopIcon.background", "DesktopIcon.foreground" );
+
+		iconSize = UIManager.getDimension( "DesktopIcon.iconSize" );
+		closeSize = UIManager.getDimension( "DesktopIcon.closeSize" );
+	}
+
+	@Override
+	protected void installListeners() {
+		super.installListeners();
+
+		closeListener = e -> {
+			if( frame.isClosable() )
+				frame.doDefaultCloseAction();
+		};
+		closeButton.addActionListener( closeListener );
+		closeButton.addMouseListener( mouseInputListener );
+	}
+
+	@Override
+	protected void uninstallListeners() {
+		super.uninstallListeners();
+
+		closeButton.removeActionListener( closeListener );
+		closeButton.removeMouseListener( mouseInputListener );
+		closeListener = null;
+		mouseInputListener = null;
+	}
+
+	@Override
+	protected MouseInputListener createMouseInputListener() {
+		mouseInputListener = new MouseInputAdapter() {
+			@Override
+			public void mouseReleased( MouseEvent e ) {
+				if( frame.isIcon() && desktopIcon.contains( e.getX(), e.getY() ) ) {
+					hideTitleTip();
+					closeButton.setVisible( false );
+
+					try {
+						frame.setIcon( false );
+					} catch( PropertyVetoException ex ) {
+						// ignore
+					}
+				}
+			}
+
+			@Override
+			public void mouseEntered( MouseEvent e ) {
+				showTitleTip();
+				if( frame.isClosable() )
+					closeButton.setVisible( true );
+			}
+
+			@Override
+			public void mouseExited( MouseEvent e ) {
+				hideTitleTip();
+				closeButton.setVisible( false );
+			}
+		};
+		return mouseInputListener;
+	}
+
+	private void showTitleTip() {
+		JRootPane rootPane = SwingUtilities.getRootPane( desktopIcon );
+		if( rootPane == null )
+			return;
+
+		if( titleTip == null ) {
+			titleTip = new JToolTip();
+			rootPane.getLayeredPane().add( titleTip, JLayeredPane.POPUP_LAYER );
+		}
+		titleTip.setTipText( frame.getTitle() );
+		titleTip.setSize( titleTip.getPreferredSize() );
+
+		int tx = (desktopIcon.getWidth() - titleTip.getWidth()) / 2;
+		int ty = -(titleTip.getHeight() + UIScale.scale( 4 ));
+		Point pt = SwingUtilities.convertPoint( desktopIcon, tx, ty, titleTip.getParent() );
+		if( pt.x + titleTip.getWidth() > rootPane.getWidth() )
+			pt.x = rootPane.getWidth() - titleTip.getWidth();
+		if( pt.x < 0 )
+			pt.x = 0;
+		titleTip.setLocation( pt );
+		titleTip.repaint();
+	}
+
+	private void hideTitleTip() {
+		if( titleTip == null )
+			return;
+
+		titleTip.setVisible( false );
+		titleTip.getParent().remove( titleTip );
+		titleTip = null;
+	}
+
+	@Override
+	public Dimension getPreferredSize( JComponent c ) {
+		return UIScale.scale( iconSize );
+	}
+
+	@Override
+	public Dimension getMinimumSize( JComponent c ) {
+		return getPreferredSize( c );
+	}
+
+	@Override
+	public Dimension getMaximumSize( JComponent c ) {
+		return getPreferredSize( c );
+	}
+
+	void updateDockIcon() {
+		// use invoke later to make sure that components are updated when switching LaF
+		EventQueue.invokeLater( () -> {
+			if( dockIcon != null )
+				updateDockIconLater();
+		} );
+	}
+
+	private void updateDockIconLater() {
+		// make sure that frame is not selected
+		if( frame.isSelected() ) {
+			try {
+				frame.setSelected( false );
+			} catch( PropertyVetoException ex ) {
+				// ignore
+			}
+		}
+
+		// paint internal frame to buffered image
+		int frameWidth = Math.max( frame.getWidth(), 1 );
+		int frameHeight = Math.max( frame.getHeight(), 1 );
+		BufferedImage frameImage = new BufferedImage( frameWidth, frameHeight, BufferedImage.TYPE_INT_ARGB );
+		Graphics2D g = frameImage.createGraphics();
+		try {
+			//TODO fix missing internal frame header when switching LaF
+			frame.paint( g );
+		} finally {
+			g.dispose();
+		}
+
+		// compute preview size (keep ratio; also works with non-square preview)
+		Insets insets = desktopIcon.getInsets();
+		int previewWidth = UIScale.scale( iconSize.width ) - insets.left - insets.right;
+		int previewHeight = UIScale.scale( iconSize.height ) - insets.top - insets.bottom;
+		float frameRatio = ((float) frameHeight / (float) frameWidth);
+		if( ((float) previewWidth / (float) frameWidth) > ((float) previewHeight / (float) frameHeight) )
+			previewWidth = Math.round( previewHeight / frameRatio );
+		else
+			previewHeight = Math.round( previewWidth * frameRatio );
+
+		// scale preview
+		Image previewImage = frameImage.getScaledInstance( previewWidth, previewHeight, Image.SCALE_SMOOTH );
+		dockIcon.setIcon( new ImageIcon( previewImage ) );
+	}
+
+	//---- class DockIcon -----------------------------------------------------
+
+	private class FlatDesktopIconLayout
+		implements LayoutManager
+	{
+		@Override public void addLayoutComponent( String name, Component comp ) {}
+		@Override public void removeLayoutComponent( Component comp ) {}
+
+		@Override
+		public Dimension preferredLayoutSize( Container parent ) {
+			return dockIcon.getPreferredSize();
+		}
+
+		@Override
+		public Dimension minimumLayoutSize( Container parent ) {
+			return dockIcon.getMinimumSize();
+		}
+
+		@Override
+		public void layoutContainer( Container parent ) {
+			Insets insets = parent.getInsets();
+
+			// dock icon
+			dockIcon.setBounds( insets.left, insets.top,
+				parent.getWidth() - insets.left - insets.right,
+				parent.getHeight() - insets.top - insets.bottom );
+
+			// close button in upper right corner
+			Dimension cSize = UIScale.scale( closeSize );
+			closeButton.setBounds( parent.getWidth() - cSize.width, 0, cSize.width, cSize.height );
+		}
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatDesktopPaneUI.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright 2020 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.ui;
+
+import javax.swing.DefaultDesktopManager;
+import javax.swing.JComponent;
+import javax.swing.JInternalFrame;
+import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.UIResource;
+import javax.swing.plaf.basic.BasicDesktopPaneUI;
+
+/**
+ * Provides the Flat LaF UI delegate for {@link javax.swing.JDesktopPane}.
+ *
+ * <!-- BasicDesktopPaneUI -->
+ *
+ * @uiDefault Desktop.background					Color
+ * @uiDefault Desktop.minOnScreenInsets				Insets
+ *
+ * @author Karl Tauber
+ */
+public class FlatDesktopPaneUI
+	extends BasicDesktopPaneUI
+{
+	public static ComponentUI createUI( JComponent c ) {
+		return new FlatDesktopPaneUI();
+	}
+
+	@Override
+	protected void installDesktopManager() {
+		desktopManager = desktop.getDesktopManager();
+		if( desktopManager == null ) {
+			desktopManager = new FlatDesktopManager();
+			desktop.setDesktopManager( desktopManager );
+		}
+	}
+
+	//---- class FlatDesktopManager -------------------------------------------
+
+	private class FlatDesktopManager
+		extends DefaultDesktopManager
+		implements UIResource
+	{
+		@Override
+		public void iconifyFrame( JInternalFrame f ) {
+			super.iconifyFrame( f );
+
+			((FlatDesktopIconUI)f.getDesktopIcon().getUI()).updateDockIcon();
+		}
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatDropShadowBorder.java

@@ -0,0 +1,223 @@
+/*
+ * Copyright 2020 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.ui;
+
+import java.awt.Color;
+import java.awt.Component;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.Image;
+import java.awt.Insets;
+import java.awt.RadialGradientPaint;
+import java.awt.image.BufferedImage;
+import com.formdev.flatlaf.util.HiDPIUtils;
+import com.formdev.flatlaf.util.UIScale;
+
+/**
+ * Paints a drop shadow border around the component.
+ * Supports 1-sided, 2-side, 3-sided or 4-sided drop shadows.
+ * <p>
+ * The shadow insets allow specifying drop shadow thickness for each side.
+ * A zero or negative value hides the drop shadow on that side.
+ * A negative value can be used to indent the drop shadow on corners.
+ * E.g. -4 on left indents drop shadow at top-left and bottom-left corners by 4 pixels.
+ *
+ * @author Karl Tauber
+ */
+public class FlatDropShadowBorder
+	extends FlatEmptyBorder
+{
+	private final Color shadowColor;
+	private final Insets shadowInsets;
+	private final float shadowOpacity;
+
+	private final int shadowSize;
+	private Image shadowImage;
+	private Color lastShadowColor;
+	private double lastSystemScaleFactor;
+	private float lastUserScaleFactor;
+
+	public FlatDropShadowBorder() {
+		this( null );
+	}
+
+	public FlatDropShadowBorder( Color shadowColor ) {
+		this( shadowColor, 4, 0.5f );
+	}
+
+	public FlatDropShadowBorder( Color shadowColor, int shadowSize, float shadowOpacity ) {
+		this( shadowColor, new Insets( -shadowSize, -shadowSize, shadowSize, shadowSize ), shadowOpacity );
+	}
+
+	public FlatDropShadowBorder( Color shadowColor, Insets shadowInsets, float shadowOpacity ) {
+		super( Math.max( shadowInsets.top, 0 ), Math.max( shadowInsets.left, 0 ),
+			Math.max( shadowInsets.bottom, 0 ), Math.max( shadowInsets.right, 0 ) );
+		this.shadowColor = shadowColor;
+		this.shadowInsets = shadowInsets;
+		this.shadowOpacity = shadowOpacity;
+
+		shadowSize = Math.max(
+			Math.max( shadowInsets.left, shadowInsets.right ),
+			Math.max( shadowInsets.top, shadowInsets.bottom ) );
+	}
+
+	@Override
+	public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
+		if( shadowSize <= 0 )
+			return;
+
+		HiDPIUtils.paintAtScale1x( (Graphics2D) g, x, y, width, height, this::paintImpl );
+	}
+
+	private void paintImpl( Graphics2D g, int x, int y, int width, int height, double scaleFactor ) {
+		Color shadowColor = (this.shadowColor != null) ? this.shadowColor : g.getColor();
+		int shadowSize = scale( this.shadowSize, scaleFactor );
+
+		// create and cache shadow image
+		float userScaleFactor = UIScale.getUserScaleFactor();
+		if( shadowImage == null ||
+			!shadowColor.equals( lastShadowColor ) ||
+			lastSystemScaleFactor != scaleFactor ||
+			lastUserScaleFactor != userScaleFactor )
+		{
+			shadowImage = createShadowImage( shadowColor, shadowSize, shadowOpacity,
+				(float) (scaleFactor * userScaleFactor) );
+			lastShadowColor = shadowColor;
+			lastSystemScaleFactor = scaleFactor;
+			lastUserScaleFactor = userScaleFactor;
+		}
+
+/*debug
+		int m = shadowImage.getWidth( null );
+		Color oldColor = g.getColor();
+		g.setColor( Color.lightGray );
+		g.drawRect( x - m - 1, y - m - 1, m + 1, m + 1 );
+		g.setColor( Color.white );
+		g.fillRect( x - m, y - m, m, m );
+		g.drawImage( shadowImage, x - m, y - m, null );
+		g.setColor( oldColor );
+debug*/
+
+		int left = scale( shadowInsets.left, scaleFactor );
+		int right = scale( shadowInsets.right, scaleFactor );
+		int top = scale( shadowInsets.top, scaleFactor );
+		int bottom = scale( shadowInsets.bottom, scaleFactor );
+
+		// shadow outer coordinates
+		int x1o = x - Math.min( left, 0 );
+		int y1o = y - Math.min( top, 0 );
+		int x2o = x + width + Math.min( right, 0 );
+		int y2o = y + height + Math.min( bottom, 0 );
+
+		// shadow inner coordinates
+		int x1i = x1o + shadowSize;
+		int y1i = y1o + shadowSize;
+		int x2i = x2o - shadowSize;
+		int y2i = y2o - shadowSize;
+
+		int wh = (shadowSize * 2) - 1;
+		int center = shadowSize - 1;
+
+		// left-top edge
+		if( left > 0 || top > 0 ) {
+			g.drawImage( shadowImage, x1o, y1o, x1i, y1i,
+				0, 0, center, center, null );
+		}
+
+		// top shadow
+		if( top > 0 ) {
+			g.drawImage( shadowImage, x1i, y1o, x2i, y1i,
+				center, 0, center + 1, center, null );
+		}
+
+		// right-top edge
+		if( right > 0 || top > 0 ) {
+			g.drawImage( shadowImage, x2i, y1o, x2o, y1i,
+				center, 0, wh, center, null );
+		}
+
+		// left shadow
+		if( left > 0 ) {
+			g.drawImage( shadowImage, x1o, y1i, x1i, y2i,
+				0, center, center, center + 1, null );
+		}
+
+		// right shadow
+		if( right > 0 ) {
+			g.drawImage( shadowImage, x2i, y1i, x2o, y2i,
+				center, center, wh, center + 1, null );
+		}
+
+		// left-bottom edge
+		if( left > 0 || bottom > 0 ) {
+			g.drawImage( shadowImage, x1o, y2i, x1i, y2o,
+				0, center, center, wh, null );
+		}
+
+		// bottom shadow
+		if( bottom > 0 ) {
+			g.drawImage( shadowImage, x1i, y2i, x2i, y2o,
+				center, center, center + 1, wh, null );
+		}
+
+		// right-bottom edge
+		if( right > 0 || bottom > 0 ) {
+			g.drawImage( shadowImage, x2i, y2i, x2o, y2o,
+				center, center, wh, wh, null );
+		}
+	}
+
+	private int scale( int value, double scaleFactor ) {
+		return (int) Math.ceil( UIScale.scale( value ) * scaleFactor );
+	}
+
+	private static BufferedImage createShadowImage( Color shadowColor, int shadowSize,
+		float shadowOpacity, float scaleFactor )
+	{
+		int shadowRGB = shadowColor.getRGB() & 0xffffff;
+		int shadowAlpha = (int) (255 * shadowOpacity);
+		Color startColor = new Color( shadowRGB | ((shadowAlpha & 0xff) << 24), true );
+		Color midColor = new Color( shadowRGB | (((shadowAlpha / 2) & 0xff) << 24), true );
+		Color endColor = new Color( shadowRGB, true );
+
+/*debug
+		startColor = Color.red;
+		midColor = Color.green;
+		endColor = Color.blue;
+debug*/
+
+		int wh = (shadowSize * 2) - 1;
+		int center = shadowSize - 1;
+
+		RadialGradientPaint p = new RadialGradientPaint( center, center,
+			shadowSize - (0.75f * scaleFactor),
+			new float[] { 0, 0.35f, 1 },
+			new Color[] { startColor, midColor, endColor } );
+
+		BufferedImage image = new BufferedImage( wh, wh, BufferedImage.TYPE_INT_ARGB );
+
+		Graphics2D g = image.createGraphics();
+		try {
+			g.setPaint( p );
+			g.fillRect( 0, 0, wh, wh );
+		} finally {
+			g.dispose();
+		}
+
+		return image;
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatEditorPaneUI.java

@@ -18,18 +18,39 @@ package com.formdev.flatlaf.ui;
 
 import static com.formdev.flatlaf.util.UIScale.scale;
 import java.awt.Dimension;
+import java.awt.Graphics;
+import java.beans.PropertyChangeEvent;
 import javax.swing.JComponent;
 import javax.swing.JEditorPane;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicEditorPaneUI;
+import javax.swing.text.JTextComponent;
+import com.formdev.flatlaf.FlatClientProperties;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JEditorPane}.
  *
- * TODO document used UI defaults of superclass
+ * <!-- BasicEditorPaneUI -->
+ *
+ * @uiDefault EditorPane.font					Font
+ * @uiDefault EditorPane.background				Color	also used if not editable
+ * @uiDefault EditorPane.foreground				Color
+ * @uiDefault EditorPane.caretForeground		Color
+ * @uiDefault EditorPane.selectionBackground	Color
+ * @uiDefault EditorPane.selectionForeground	Color
+ * @uiDefault EditorPane.disabledBackground		Color	used if not enabled
+ * @uiDefault EditorPane.inactiveBackground		Color	used if not editable
+ * @uiDefault EditorPane.inactiveForeground		Color	used if not enabled (yes, this is confusing; this should be named disabledForeground)
+ * @uiDefault EditorPane.border					Border
+ * @uiDefault EditorPane.margin					Insets
+ * @uiDefault EditorPane.caretBlinkRate			int		default is 500 milliseconds
+ *
+ * <!-- FlatEditorPaneUI -->
  *
  * @uiDefault Component.minimumWidth			int
+ * @uiDefault Component.isIntelliJTheme			boolean
  *
  * @author Karl Tauber
  */
@@ -37,6 +58,7 @@ public class FlatEditorPaneUI
 	extends BasicEditorPaneUI
 {
 	protected int minimumWidth;
+	protected boolean isIntelliJTheme;
 
 	private Object oldHonorDisplayProperties;
 
@@ -49,6 +71,7 @@ public class FlatEditorPaneUI
 		super.installDefaults();
 
 		minimumWidth = UIManager.getInt( "Component.minimumWidth" );
+		isIntelliJTheme = UIManager.getBoolean( "Component.isIntelliJTheme" );
 
 		// use component font and foreground for HTML text
 		oldHonorDisplayProperties = getComponent().getClientProperty( JEditorPane.HONOR_DISPLAY_PROPERTIES );
@@ -62,22 +85,50 @@ public class FlatEditorPaneUI
 		getComponent().putClientProperty( JEditorPane.HONOR_DISPLAY_PROPERTIES, oldHonorDisplayProperties );
 	}
 
+	@Override
+	protected void propertyChange( PropertyChangeEvent e ) {
+		super.propertyChange( e );
+		propertyChange( getComponent(), e );
+	}
+
+	static void propertyChange( JTextComponent c, PropertyChangeEvent e ) {
+		switch( e.getPropertyName() ) {
+			case FlatClientProperties.MINIMUM_WIDTH:
+				c.revalidate();
+				break;
+		}
+	}
+
 	@Override
 	public Dimension getPreferredSize( JComponent c ) {
-		return applyMinimumWidth( super.getPreferredSize( c ) );
+		return applyMinimumWidth( c, super.getPreferredSize( c ), minimumWidth );
 	}
 
 	@Override
 	public Dimension getMinimumSize( JComponent c ) {
-		return applyMinimumWidth( super.getMinimumSize( c ) );
+		return applyMinimumWidth( c, super.getMinimumSize( c ), minimumWidth );
 	}
 
-	private Dimension applyMinimumWidth( Dimension size ) {
+	static Dimension applyMinimumWidth( JComponent c, Dimension size, int minimumWidth ) {
 		// Assume that text area is in a scroll pane (that displays the border)
 		// and subtract 1px border line width.
 		// Using "(scale( 1 ) * 2)" instead of "scale( 2 )" to deal with rounding
 		// issues. E.g. at scale factor 1.5 the first returns 4, but the second 3.
+		minimumWidth = FlatUIUtils.minimumWidth( c, minimumWidth );
 		size.width = Math.max( size.width, scale( minimumWidth ) - (scale( 1 ) * 2) );
 		return size;
 	}
+
+	@Override
+	protected void paintBackground( Graphics g ) {
+		JTextComponent c = getComponent();
+
+		// for compatibility with IntelliJ themes
+		if( isIntelliJTheme && (!c.isEnabled() || !c.isEditable()) && (c.getBackground() instanceof UIResource) ) {
+			FlatUIUtils.paintParentBackground( g, c );
+			return;
+		}
+
+		super.paintBackground( g );
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatEmptyBorder.java

@@ -50,9 +50,10 @@ public class FlatEmptyBorder
 
 	@Override
 	public Insets getBorderInsets( Component c, Insets insets ) {
-		insets.left = scale( left );
+		boolean leftToRight = left == right || c.getComponentOrientation().isLeftToRight();
+		insets.left = scale( leftToRight ? left : right );
 		insets.top = scale( top );
-		insets.right = scale( right );
+		insets.right = scale( leftToRight ? right : left );
 		insets.bottom = scale( bottom );
 		return insets;
 	}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatFileChooserUI.java

@@ -0,0 +1,235 @@
+/*
+ * Copyright 2019 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.ui;
+
+import java.awt.BorderLayout;
+import java.awt.Component;
+import java.awt.Dimension;
+import java.awt.Insets;
+import java.io.File;
+import javax.swing.AbstractButton;
+import javax.swing.Box;
+import javax.swing.BoxLayout;
+import javax.swing.Icon;
+import javax.swing.ImageIcon;
+import javax.swing.JButton;
+import javax.swing.JComponent;
+import javax.swing.JFileChooser;
+import javax.swing.JPanel;
+import javax.swing.JToggleButton;
+import javax.swing.UIManager;
+import javax.swing.filechooser.FileView;
+import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.metal.MetalFileChooserUI;
+import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.util.ScaledImageIcon;
+import com.formdev.flatlaf.util.UIScale;
+
+/**
+ * Provides the Flat LaF UI delegate for {@link javax.swing.JFileChooser}.
+ *
+ * <!-- BasicFileChooserUI -->
+ *
+ * @uiDefault FileView.directoryIcon					Icon
+ * @uiDefault FileView.fileIcon							Icon
+ * @uiDefault FileView.computerIcon						Icon
+ * @uiDefault FileView.hardDriveIcon					Icon
+ * @uiDefault FileView.floppyDriveIcon					Icon
+ *
+ * @uiDefault FileChooser.newFolderIcon					Icon
+ * @uiDefault FileChooser.upFolderIcon					Icon
+ * @uiDefault FileChooser.homeFolderIcon				Icon
+ * @uiDefault FileChooser.detailsViewIcon				Icon
+ * @uiDefault FileChooser.listViewIcon					Icon
+ * @uiDefault FileChooser.viewMenuIcon					Icon
+ *
+ * @uiDefault FileChooser.usesSingleFilePane			boolean
+ * @uiDefault FileChooser.readOnly						boolean	if true, "New Folder" is disabled
+ *
+ * @uiDefault FileChooser.newFolderErrorText					String
+ * @uiDefault FileChooser.newFolderErrorSeparator				String
+ * @uiDefault FileChooser.newFolderParentDoesntExistTitleText	String
+ * @uiDefault FileChooser.newFolderParentDoesntExistText		String
+ * @uiDefault FileChooser.fileDescriptionText					String
+ * @uiDefault FileChooser.directoryDescriptionText				String
+ * @uiDefault FileChooser.saveButtonText						String
+ * @uiDefault FileChooser.openButtonText						String
+ * @uiDefault FileChooser.saveDialogTitleText					String
+ * @uiDefault FileChooser.openDialogTitleText					String
+ * @uiDefault FileChooser.cancelButtonText						String
+ * @uiDefault FileChooser.updateButtonText						String
+ * @uiDefault FileChooser.helpButtonText						String
+ * @uiDefault FileChooser.directoryOpenButtonText				String
+ *
+ * @uiDefault FileChooser.saveButtonMnemonic					String
+ * @uiDefault FileChooser.openButtonMnemonic					String
+ * @uiDefault FileChooser.cancelButtonMnemonic					String
+ * @uiDefault FileChooser.updateButtonMnemonic					String
+ * @uiDefault FileChooser.helpButtonMnemonic					String
+ * @uiDefault FileChooser.directoryOpenButtonMnemonic			String
+ *
+ * @uiDefault FileChooser.saveButtonToolTipText					String
+ * @uiDefault FileChooser.openButtonToolTipText					String
+ * @uiDefault FileChooser.cancelButtonToolTipText				String
+ * @uiDefault FileChooser.updateButtonToolTipText				String
+ * @uiDefault FileChooser.helpButtonToolTipText					String
+ * @uiDefault FileChooser.directoryOpenButtonToolTipText		String
+ *
+ * @uiDefault FileChooser.acceptAllFileFilterText				String
+ *
+ * <!-- MetalFileChooserUI -->
+ *
+ * @uiDefault FileChooser.lookInLabelMnemonic					String
+ * @uiDefault FileChooser.lookInLabelText						String
+ * @uiDefault FileChooser.saveInLabelText						String
+ * @uiDefault FileChooser.fileNameLabelMnemonic					String
+ * @uiDefault FileChooser.fileNameLabelText						String
+ * @uiDefault FileChooser.folderNameLabelMnemonic				String
+ * @uiDefault FileChooser.folderNameLabelText					String
+ * @uiDefault FileChooser.filesOfTypeLabelMnemonic				String
+ * @uiDefault FileChooser.filesOfTypeLabelText					String
+ *
+ * @uiDefault FileChooser.upFolderToolTipText					String
+ * @uiDefault FileChooser.upFolderAccessibleName				String
+ * @uiDefault FileChooser.homeFolderToolTipText					String
+ * @uiDefault FileChooser.homeFolderAccessibleName				String
+ * @uiDefault FileChooser.newFolderToolTipText					String
+ * @uiDefault FileChooser.newFolderAccessibleName				String
+ * @uiDefault FileChooser.listViewButtonToolTipText				String
+ * @uiDefault FileChooser.listViewButtonAccessibleName			String
+ * @uiDefault FileChooser.detailsViewButtonToolTipText			String
+ * @uiDefault FileChooser.detailsViewButtonAccessibleName		String
+ *
+ * <!-- FilePane -->
+ *
+ * @uiDefault FileChooser.fileNameHeaderText					String
+ * @uiDefault FileChooser.fileSizeHeaderText					String
+ * @uiDefault FileChooser.fileTypeHeaderText					String
+ * @uiDefault FileChooser.fileDateHeaderText					String
+ * @uiDefault FileChooser.fileAttrHeaderText					String
+ *
+ * @uiDefault FileChooser.viewMenuLabelText						String
+ * @uiDefault FileChooser.refreshActionLabelText				String
+ * @uiDefault FileChooser.newFolderActionLabelText				String
+ * @uiDefault FileChooser.listViewActionLabelText				String
+ * @uiDefault FileChooser.detailsViewActionLabelText			String
+ *
+ * @author Karl Tauber
+ */
+public class FlatFileChooserUI
+	extends MetalFileChooserUI
+{
+	private final FlatFileView fileView = new FlatFileView();
+
+	public static ComponentUI createUI( JComponent c ) {
+		return new FlatFileChooserUI( (JFileChooser) c );
+	}
+
+	public FlatFileChooserUI( JFileChooser filechooser ) {
+		super( filechooser );
+	}
+
+	@Override
+	public void installComponents( JFileChooser fc ) {
+		super.installComponents( fc );
+
+		patchUI( fc );
+	}
+
+	private void patchUI( JFileChooser fc ) {
+		// turn top-right buttons into toolbar buttons
+		Component topPanel = fc.getComponent( 0 );
+		if( (topPanel instanceof JPanel) &&
+			(((JPanel)topPanel).getLayout() instanceof BorderLayout) )
+		{
+			Component topButtonPanel = ((JPanel)topPanel).getComponent( 0 );
+			if( (topButtonPanel instanceof JPanel) &&
+				(((JPanel)topButtonPanel).getLayout() instanceof BoxLayout) )
+			{
+				Insets margin = UIManager.getInsets( "Button.margin" );
+				Component[] comps = ((JPanel)topButtonPanel).getComponents();
+				for( int i = comps.length - 1; i >= 0; i-- ) {
+					Component c = comps[i];
+					if( c instanceof JButton || c instanceof JToggleButton ) {
+						AbstractButton b = (AbstractButton)c;
+						b.putClientProperty( FlatClientProperties.BUTTON_TYPE,
+							FlatClientProperties.BUTTON_TYPE_TOOLBAR_BUTTON );
+						b.setMargin( margin );
+						b.setFocusable( false );
+					} else if( c instanceof Box.Filler )
+						((JPanel)topButtonPanel).remove( i );
+				}
+			}
+		}
+	}
+
+	@Override
+	public Dimension getPreferredSize( JComponent c ) {
+		return UIScale.scale( super.getPreferredSize( c ) );
+	}
+
+	@Override
+	public Dimension getMinimumSize( JComponent c ) {
+		return UIScale.scale( super.getMinimumSize( c ) );
+	}
+
+	@Override
+	public FileView getFileView( JFileChooser fc ) {
+		return fileView;
+	}
+
+	@Override
+	public void clearIconCache() {
+		fileView.clearIconCache();
+	}
+
+	//---- class FlatFileView -------------------------------------------------
+
+	private class FlatFileView
+		extends BasicFileView
+	{
+		@Override
+		public Icon getIcon( File f ) {
+			// get cached icon
+			Icon icon = getCachedIcon( f );
+			if( icon != null )
+				return icon;
+
+			// get system icon
+			if( f != null ) {
+				icon = getFileChooser().getFileSystemView().getSystemIcon( f );
+
+				if( icon != null ) {
+					if( icon instanceof ImageIcon )
+						icon = new ScaledImageIcon( (ImageIcon) icon );
+					cacheIcon( f, icon );
+					return icon;
+				}
+			}
+
+			// get default icon
+			icon = super.getIcon( f );
+
+			if( icon instanceof ImageIcon ) {
+				icon = new ScaledImageIcon( (ImageIcon) icon );
+				cacheIcon( f, icon );
+			}
+
+			return icon;
+		}
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatFormattedTextFieldUI.java

@@ -22,6 +22,30 @@ import javax.swing.plaf.ComponentUI;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JFormattedTextField}.
  *
+ * <!-- BasicTextFieldUI -->
+ *
+ * @uiDefault FormattedTextField.font					Font
+ * @uiDefault FormattedTextField.background				Color
+ * @uiDefault FormattedTextField.foreground				Color	also used if not editable
+ * @uiDefault FormattedTextField.caretForeground		Color
+ * @uiDefault FormattedTextField.selectionBackground	Color
+ * @uiDefault FormattedTextField.selectionForeground	Color
+ * @uiDefault FormattedTextField.disabledBackground		Color	used if not enabled
+ * @uiDefault FormattedTextField.inactiveBackground		Color	used if not editable
+ * @uiDefault FormattedTextField.inactiveForeground		Color	used if not enabled (yes, this is confusing; this should be named disabledForeground)
+ * @uiDefault FormattedTextField.border					Border
+ * @uiDefault FormattedTextField.margin					Insets
+ * @uiDefault FormattedTextField.caretBlinkRate			int		default is 500 milliseconds
+ *
+ * <!-- FlatTextFieldUI -->
+ *
+ * @uiDefault TextComponent.arc							int
+ * @uiDefault Component.focusWidth						int
+ * @uiDefault Component.minimumWidth					int
+ * @uiDefault Component.isIntelliJTheme					boolean
+ * @uiDefault FormattedTextField.placeholderForeground	Color
+ * @uiDefault TextComponent.selectAllOnFocusPolicy		String	never, once (default) or always
+ *
  * @author Karl Tauber
  */
 public class FlatFormattedTextFieldUI

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatInternalFrameTitlePane.java

@@ -0,0 +1,190 @@
+/*
+ * Copyright 2020 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.ui;
+
+import java.awt.BorderLayout;
+import java.awt.Color;
+import java.awt.Dimension;
+import java.awt.Graphics;
+import java.awt.LayoutManager;
+import java.beans.PropertyChangeEvent;
+import java.beans.PropertyChangeListener;
+import javax.swing.BorderFactory;
+import javax.swing.BoxLayout;
+import javax.swing.Icon;
+import javax.swing.JInternalFrame;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.LookAndFeel;
+import javax.swing.UIManager;
+import javax.swing.border.Border;
+import javax.swing.plaf.basic.BasicInternalFrameTitlePane;
+import com.formdev.flatlaf.util.UIScale;
+
+/**
+ * Provides the Flat LaF internal frame title bar.
+ *
+ * @author Karl Tauber
+ */
+public class FlatInternalFrameTitlePane
+	extends BasicInternalFrameTitlePane
+{
+	private JLabel titleLabel;
+	private JPanel buttonPanel;
+
+	public FlatInternalFrameTitlePane( JInternalFrame f ) {
+		super( f );
+	}
+
+	@Override
+	protected void installDefaults() {
+		super.installDefaults();
+
+		LookAndFeel.installBorder( this, "InternalFrameTitlePane.border" );
+	}
+
+	@Override
+	protected PropertyChangeListener createPropertyChangeListener() {
+		return new FlatPropertyChangeHandler();
+	}
+
+	@Override
+	protected LayoutManager createLayout() {
+		return new BorderLayout( UIScale.scale( 4 ), 0 );
+	}
+
+	@Override
+	protected void createButtons() {
+		super.createButtons();
+
+		iconButton.setContentAreaFilled( false );
+		maxButton.setContentAreaFilled( false );
+		closeButton.setContentAreaFilled( false );
+
+		Border emptyBorder = BorderFactory.createEmptyBorder();
+		iconButton.setBorder( emptyBorder );
+		maxButton.setBorder( emptyBorder );
+		closeButton.setBorder( emptyBorder );
+
+		updateButtonsVisibility();
+	}
+
+	@Override
+	protected void addSubComponents() {
+		titleLabel = new JLabel( frame.getTitle() );
+		titleLabel.setFont( FlatUIUtils.nonUIResource( getFont() ) );
+		titleLabel.setMinimumSize( new Dimension( UIScale.scale( 32 ), 1 ) );
+		updateFrameIcon();
+		updateColors();
+
+		buttonPanel = new JPanel();
+		buttonPanel.setLayout( new BoxLayout( buttonPanel, BoxLayout.LINE_AXIS ) );
+		buttonPanel.setOpaque( false );
+
+		buttonPanel.add( iconButton );
+		buttonPanel.add( maxButton );
+		buttonPanel.add( closeButton );
+
+		add( titleLabel, BorderLayout.CENTER );
+		add( buttonPanel, BorderLayout.LINE_END );
+	}
+
+	private void updateFrameIcon() {
+		Icon frameIcon = frame.getFrameIcon();
+		if( frameIcon == UIManager.getIcon( "InternalFrame.icon" ) )
+			frameIcon = null;
+		titleLabel.setIcon( frameIcon );
+	}
+
+	private void updateColors() {
+		Color background = FlatUIUtils.nonUIResource( frame.isSelected() ? selectedTitleColor : notSelectedTitleColor );
+		Color foreground = FlatUIUtils.nonUIResource( frame.isSelected() ? selectedTextColor : notSelectedTextColor );
+
+		titleLabel.setForeground( foreground );
+		iconButton.setBackground( background );
+		iconButton.setForeground( foreground );
+		maxButton.setBackground( background );
+		maxButton.setForeground( foreground );
+		closeButton.setBackground( background );
+		closeButton.setForeground( foreground );
+	}
+
+	private void updateButtonsVisibility() {
+		iconButton.setVisible( frame.isIconifiable() );
+		maxButton.setVisible( frame.isMaximizable() );
+		closeButton.setVisible( frame.isClosable() );
+	}
+
+	/**
+	 * Does nothing because FlatLaf internal frames do not have system menus.
+	 */
+	@Override
+	protected void assembleSystemMenu() {
+	}
+
+	/**
+	 * Does nothing because FlatLaf internal frames do not have system menus.
+	 */
+	@Override
+	protected void showSystemMenu() {
+	}
+
+	@Override
+	public void paintComponent( Graphics g ) {
+		paintTitleBackground( g );
+	}
+
+	//---- class FlatPropertyChangeHandler ------------------------------------
+
+	private class FlatPropertyChangeHandler
+		extends PropertyChangeHandler
+	{
+		@Override
+		public void propertyChange( PropertyChangeEvent e ) {
+			switch( e.getPropertyName() ) {
+				case JInternalFrame.TITLE_PROPERTY:
+					titleLabel.setText( frame.getTitle() );
+					break;
+
+				case JInternalFrame.FRAME_ICON_PROPERTY:
+					updateFrameIcon();
+					break;
+
+				case JInternalFrame.IS_SELECTED_PROPERTY:
+					updateColors();
+					break;
+
+				case "iconable":
+				case "maximizable":
+				case "closable":
+					updateButtonsVisibility();
+					enableActions();
+					revalidate();
+					repaint();
+
+					// do not invoke super.propertyChange() because this adds/removes the buttons
+					return;
+
+				case "componentOrientation":
+					applyComponentOrientation( frame.getComponentOrientation() );
+					break;
+			}
+
+			super.propertyChange( e );
+		}
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatInternalFrameUI.java

@@ -0,0 +1,180 @@
+/*
+ * Copyright 2020 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.ui;
+
+import static com.formdev.flatlaf.util.UIScale.scale;
+import java.awt.Color;
+import java.awt.Component;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.Insets;
+import javax.swing.JComponent;
+import javax.swing.JInternalFrame;
+import javax.swing.LookAndFeel;
+import javax.swing.UIManager;
+import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.basic.BasicInternalFrameUI;
+
+/**
+ * Provides the Flat LaF UI delegate for {@link javax.swing.JInternalFrame}.
+ *
+ * <!-- BasicInternalFrameUI -->
+ *
+ * @uiDefault control											Color
+ * @uiDefault InternalFrame.icon								Icon
+ * @uiDefault InternalFrame.border								Border
+ * @uiDefault InternalFrame.layoutTitlePaneAtOrigin				boolean
+ *
+ * <!-- BasicInternalFrameTitlePane -->
+ *
+ * @uiDefault InternalFrame.titleFont							Font
+ * @uiDefault InternalFrame.icon								Icon
+ * @uiDefault InternalFrame.maximizeIcon						Icon
+ * @uiDefault InternalFrame.minimizeIcon						Icon
+ * @uiDefault InternalFrame.iconifyIcon							Icon
+ * @uiDefault InternalFrame.closeIcon							Icon
+ * @uiDefault InternalFrame.activeTitleBackground				Color
+ * @uiDefault InternalFrame.activeTitleForeground				Color
+ * @uiDefault InternalFrame.inactiveTitleBackground				Color
+ * @uiDefault InternalFrame.inactiveTitleForeground				Color
+ * @uiDefault InternalFrame.closeButtonToolTip					String
+ * @uiDefault InternalFrame.iconButtonToolTip					String
+ * @uiDefault InternalFrame.restoreButtonToolTip				String
+ * @uiDefault InternalFrame.maxButtonToolTip					String
+ * @uiDefault InternalFrameTitlePane.closeButtonText			String
+ * @uiDefault InternalFrameTitlePane.minimizeButtonText			String
+ * @uiDefault InternalFrameTitlePane.restoreButtonText			String
+ * @uiDefault InternalFrameTitlePane.maximizeButtonText			String
+ * @uiDefault InternalFrameTitlePane.moveButtonText				String
+ * @uiDefault InternalFrameTitlePane.sizeButtonText				String
+ * @uiDefault InternalFrameTitlePane.closeButton.mnemonic		Integer
+ * @uiDefault InternalFrameTitlePane.minimizeButton.mnemonic	Integer
+ * @uiDefault InternalFrameTitlePane.restoreButton.mnemonic		Integer
+ * @uiDefault InternalFrameTitlePane.maximizeButton.mnemonic	Integer
+ * @uiDefault InternalFrameTitlePane.moveButton.mnemonic		Integer
+ * @uiDefault InternalFrameTitlePane.sizeButton.mnemonic		Integer
+ *
+ * <!-- FlatInternalFrameUI -->
+ *
+ * @uiDefault InternalFrame.activeBorderColor					Color
+ * @uiDefault InternalFrame.inactiveBorderColor					Color
+ * @uiDefault InternalFrame.borderLineWidth						int
+ * @uiDefault InternalFrame.borderMargins						Insets
+ *
+ * <!-- FlatInternalFrameTitlePane -->
+ *
+ * @uiDefault InternalFrameTitlePane.border						Border
+ *
+ * @author Karl Tauber
+ */
+public class FlatInternalFrameUI
+	extends BasicInternalFrameUI
+{
+	public static ComponentUI createUI( JComponent c ) {
+		return new FlatInternalFrameUI( (JInternalFrame) c );
+	}
+
+	public FlatInternalFrameUI( JInternalFrame b ) {
+		super( b );
+	}
+
+	@Override
+	public void installUI( JComponent c ) {
+		super.installUI( c );
+
+		LookAndFeel.installProperty( frame, "opaque", false );
+	}
+
+	@Override
+	protected JComponent createNorthPane( JInternalFrame w ) {
+		return new FlatInternalFrameTitlePane( w );
+	}
+
+	//---- class FlatInternalFrameBorder --------------------------------------
+
+	public static class FlatInternalFrameBorder
+		extends FlatEmptyBorder
+	{
+		private final Color activeBorderColor = UIManager.getColor( "InternalFrame.activeBorderColor" );
+		private final Color inactiveBorderColor = UIManager.getColor( "InternalFrame.inactiveBorderColor" );
+		private final int borderLineWidth = FlatUIUtils.getUIInt( "InternalFrame.borderLineWidth", 1 );
+		private final boolean dropShadowPainted = UIManager.getBoolean( "InternalFrame.dropShadowPainted" );
+
+		private final FlatDropShadowBorder activeDropShadowBorder = new FlatDropShadowBorder(
+			UIManager.getColor( "InternalFrame.activeDropShadowColor" ),
+			UIManager.getInsets( "InternalFrame.activeDropShadowInsets" ),
+			FlatUIUtils.getUIFloat( "InternalFrame.activeDropShadowOpacity", 0.5f ) );
+		private final FlatDropShadowBorder inactiveDropShadowBorder = new FlatDropShadowBorder(
+			UIManager.getColor( "InternalFrame.inactiveDropShadowColor" ),
+			UIManager.getInsets( "InternalFrame.inactiveDropShadowInsets" ),
+			FlatUIUtils.getUIFloat( "InternalFrame.inactiveDropShadowOpacity", 0.5f ) );
+
+		public FlatInternalFrameBorder() {
+			super( UIManager.getInsets( "InternalFrame.borderMargins" ) );
+		}
+
+		@Override
+		public Insets getBorderInsets( Component c, Insets insets ) {
+			if( c instanceof JInternalFrame && ((JInternalFrame)c).isMaximum() ) {
+				insets.left = scale( Math.min( borderLineWidth, left ) );
+				insets.top = scale( Math.min( borderLineWidth, top ) );
+				insets.right = scale( Math.min( borderLineWidth, right ) );
+				insets.bottom = scale( Math.min( borderLineWidth, bottom ) );
+				return insets;
+			}
+
+			return super.getBorderInsets( c, insets );
+		}
+
+		@Override
+		public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
+			JInternalFrame f = (JInternalFrame) c;
+
+			Insets insets = getBorderInsets( c );
+			float lineWidth = scale( (float) borderLineWidth );
+
+			float rx = x + insets.left - lineWidth;
+			float ry = y + insets.top - lineWidth;
+			float rwidth = width - insets.left - insets.right + (lineWidth * 2);
+			float rheight = height - insets.top - insets.bottom + (lineWidth * 2);
+
+			Graphics2D g2 = (Graphics2D) g.create();
+			try {
+				FlatUIUtils.setRenderingHints( g2 );
+				g2.setColor( f.isSelected() ? activeBorderColor : inactiveBorderColor );
+
+				// paint drop shadow
+				if( dropShadowPainted ) {
+					FlatDropShadowBorder dropShadowBorder = f.isSelected()
+						? activeDropShadowBorder : inactiveDropShadowBorder;
+
+					Insets dropShadowInsets = dropShadowBorder.getBorderInsets();
+					dropShadowBorder.paintBorder( c, g2,
+						(int) rx - dropShadowInsets.left,
+						(int) ry - dropShadowInsets.top,
+						(int) rwidth + dropShadowInsets.left + dropShadowInsets.right,
+						(int) rheight + dropShadowInsets.top + dropShadowInsets.bottom );
+				}
+
+				// paint border
+				g2.fill( FlatUIUtils.createRectangle( rx, ry, rwidth, rheight, lineWidth ) );
+			} finally {
+				g2.dispose();
+			}
+		}
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatLabelUI.java

@@ -20,12 +20,14 @@ import java.awt.Color;
 import java.awt.FontMetrics;
 import java.awt.Graphics;
 import java.awt.Rectangle;
+import java.beans.PropertyChangeEvent;
 import javax.swing.Icon;
 import javax.swing.JComponent;
 import javax.swing.JLabel;
 import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.basic.BasicHTML;
 import javax.swing.plaf.basic.BasicLabelUI;
 import com.formdev.flatlaf.FlatLaf;
 import com.formdev.flatlaf.util.UIScale;
@@ -33,10 +35,15 @@ import com.formdev.flatlaf.util.UIScale;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JLabel}.
  *
+ * <!-- BasicLabelUI -->
+ *
+ * @uiDefault Label.font				Font
  * @uiDefault Label.background			Color	only used if opaque
  * @uiDefault Label.foreground			Color
+ *
+ * <!-- FlatLabelUI -->
+ *
  * @uiDefault Label.disabledForeground	Color
- * @uiDefault Label.font				Font
  *
  * @author Karl Tauber
  */
@@ -72,6 +79,51 @@ public class FlatLabelUI
 		defaults_initialized = false;
 	}
 
+	@Override
+	protected void installComponents( JLabel c ) {
+		super.installComponents( c );
+
+		// update HTML renderer if necessary
+		updateHTMLRenderer( c, c.getText(), false );
+	}
+
+	@Override
+	public void propertyChange( PropertyChangeEvent e ) {
+		String name = e.getPropertyName();
+		if( name == "text" || name == "font" || name == "foreground" ) {
+			JLabel label = (JLabel) e.getSource();
+			updateHTMLRenderer( label, label.getText(), true );
+		} else
+			super.propertyChange( e );
+	}
+
+	/**
+	 * Checks whether text contains HTML headings and adds a special CSS rule to
+	 * re-calculate heading font sizes based on current component font size.
+	 */
+	static void updateHTMLRenderer( JComponent c, String text, boolean always ) {
+		if( BasicHTML.isHTMLString( text ) &&
+			c.getClientProperty( "html.disable" ) != Boolean.TRUE &&
+			text.contains( "<h" ) &&
+			(text.contains( "<h1" ) || text.contains( "<h2" ) || text.contains( "<h3" ) ||
+			 text.contains( "<h4" ) || text.contains( "<h5" ) || text.contains( "<h6" )) )
+		{
+			int headIndex = text.indexOf( "<head>" );
+
+			String style = "<style>BASE_SIZE " + c.getFont().getSize() + "</style>";
+			if( headIndex < 0 )
+				style = "<head>" + style + "</head>";
+
+			int insertIndex = headIndex >= 0 ? (headIndex + "<head>".length()) : "<html>".length();
+			text = text.substring( 0, insertIndex )
+				+ style
+				+ text.substring( insertIndex );
+		} else if( !always )
+			return; // not necessary to invoke BasicHTML.updateRenderer()
+
+		BasicHTML.updateRenderer( c, text );
+	}
+
 	@Override
 	protected void paintEnabledText( JLabel l, Graphics g, String s, int textX, int textY ) {
 		int mnemIndex = FlatLaf.isShowMnemonics() ? l.getDisplayedMnemonicIndex() : -1;

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatLineBorder.java

@@ -26,9 +26,9 @@ import java.awt.Insets;
 /**
  * Line border for various components.
  *
- * Paints a scaled 1px thick line around the component.
- * The line thickness is not included in the border insets.
- * The insets should be at least 1,1,1,1.
+ * Paints a scaled (usually 1px thick) line around the component.
+ * The line thickness is not added to the border insets.
+ * The insets should be at least have line thickness (usually 1,1,1,1).
  *
  * @author Karl Tauber
  */
@@ -36,10 +36,24 @@ public class FlatLineBorder
 	extends FlatEmptyBorder
 {
 	private final Color lineColor;
+	private final float lineThickness;
 
 	public FlatLineBorder( Insets insets, Color lineColor ) {
+		this( insets, lineColor, 1f );
+	}
+
+	public FlatLineBorder( Insets insets, Color lineColor, float lineThickness ) {
 		super( insets );
 		this.lineColor = lineColor;
+		this.lineThickness = lineThickness;
+	}
+
+	public Color getLineColor() {
+		return lineColor;
+	}
+
+	public float getLineThickness() {
+		return lineThickness;
 	}
 
 	@Override
@@ -48,7 +62,7 @@ public class FlatLineBorder
 		try {
 			FlatUIUtils.setRenderingHints( g2 );
 			g2.setColor( lineColor );
-			FlatUIUtils.drawRoundRectangle( g2, x, y, width, height, 0f, scale( 1f ), 0f );
+			FlatUIUtils.paintComponentBorder( g2, x, y, width, height, 0f, scale( lineThickness ), 0f );
 		} finally {
 			g2.dispose();
 		}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatListCellBorder.java

@@ -0,0 +1,88 @@
+/*
+ * Copyright 2019 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.ui;
+
+import java.awt.Component;
+import java.awt.Graphics;
+import javax.swing.JList;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+
+/**
+ * Cell border for {@link javax.swing.DefaultListCellRenderer}
+ * (used by {@link javax.swing.JList}).
+ * <p>
+ * Uses separate cell margins from UI defaults to allow easy customizing.
+ *
+ * @author Karl Tauber
+ */
+public class FlatListCellBorder
+	extends FlatLineBorder
+{
+	final boolean showCellFocusIndicator = UIManager.getBoolean( "List.showCellFocusIndicator" );
+
+	protected FlatListCellBorder() {
+		super( UIManager.getInsets( "List.cellMargins" ), UIManager.getColor( "List.cellFocusColor" ) );
+	}
+
+	//---- class Default ------------------------------------------------------
+
+	/**
+	 * Border for unselected cell that uses margins, but does not paint focus indicator border.
+	 */
+	public static class Default
+		extends FlatListCellBorder
+	{
+		@Override
+		public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
+			// do not paint focus indicator border
+		}
+	}
+
+	//---- class Focused ------------------------------------------------------
+
+	/**
+	 * Border for focused unselected cell that uses margins and paints focus indicator border.
+	 */
+	public static class Focused
+		extends FlatListCellBorder
+	{
+	}
+
+	//---- class Selected -----------------------------------------------------
+
+	/**
+	 * Border for selected cell that uses margins and paints focus indicator border
+	 * if enabled (List.showCellFocusIndicator=true) and exactly one item is selected.
+	 */
+	public static class Selected
+		extends FlatListCellBorder
+	{
+		@Override
+		public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
+			if( !showCellFocusIndicator )
+				return;
+
+			// paint focus indicator border only if exactly one item is selected
+			JList<?> list = (JList<?>) SwingUtilities.getAncestorOfClass( JList.class, c );
+			if( list != null && list.getMinSelectionIndex() == list.getMaxSelectionIndex() )
+				return;
+
+			super.paintBorder( c, g, x, y, width, height );
+		}
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatListUI.java

@@ -27,11 +27,37 @@ import javax.swing.plaf.basic.BasicListUI;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JList}.
  *
- * TODO document used UI defaults of superclass
+ * <!-- BasicListUI -->
+ *
+ * @uiDefault List.font								Font
+ * @uiDefault List.background						Color
+ * @uiDefault List.foreground						Color
+ * @uiDefault List.selectionBackground				Color
+ * @uiDefault List.selectionForeground				Color
+ * @uiDefault List.dropLineColor					Color
+ * @uiDefault List.border							Border
+ * @uiDefault List.cellRenderer						ListCellRenderer
+ * @uiDefault FileChooser.listFont					Font		used if client property List.isFileList is true
+ *
+ * <!-- DefaultListCellRenderer -->
+ *
+ * @uiDefault List.cellNoFocusBorder				Border
+ * @uiDefault List.focusCellHighlightBorder			Border
+ * @uiDefault List.focusSelectedCellHighlightBorder	Border
+ * @uiDefault List.dropCellBackground				Color
+ * @uiDefault List.dropCellForeground				Color
+ *
+ * <!-- FlatListUI -->
  *
  * @uiDefault List.selectionInactiveBackground		Color
  * @uiDefault List.selectionInactiveForeground		Color
  *
+ * <!-- FlatListCellBorder -->
+ *
+ * @uiDefault List.cellMargins						Insets
+ * @uiDefault List.cellFocusColor					Color
+ * @uiDefault List.showCellFocusIndicator			boolean
+ *
  * @author Karl Tauber
  */
 public class FlatListUI
@@ -55,7 +81,7 @@ public class FlatListUI
 		selectionInactiveBackground = UIManager.getColor( "List.selectionInactiveBackground" );
 		selectionInactiveForeground = UIManager.getColor( "List.selectionInactiveForeground" );
 
-		toggleSelectionColors( list.hasFocus() );
+		toggleSelectionColors();
 	}
 
 	@Override
@@ -74,13 +100,13 @@ public class FlatListUI
 			@Override
 			public void focusGained( FocusEvent e ) {
 				super.focusGained( e );
-				toggleSelectionColors( true );
+				toggleSelectionColors();
 			}
 
 			@Override
 			public void focusLost( FocusEvent e ) {
 				super.focusLost( e );
-				toggleSelectionColors( false );
+				toggleSelectionColors();
 			}
 		};
 	}
@@ -94,8 +120,8 @@ public class FlatListUI
 	 * already used in applications. Then either the inactive colors are not used,
 	 * or the application has to be changed to extend a FlatLaf renderer.
 	 */
-	private void toggleSelectionColors( boolean focused ) {
-		if( focused ) {
+	private void toggleSelectionColors() {
+		if( FlatUIUtils.isPermanentFocusOwner( list ) ) {
 			if( list.getSelectionBackground() == selectionInactiveBackground )
 				list.setSelectionBackground( selectionBackground );
 			if( list.getSelectionForeground() == selectionInactiveForeground )

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatMarginBorder.java

@@ -29,13 +29,26 @@ import javax.swing.plaf.basic.BasicBorders;
 public class FlatMarginBorder
 	extends BasicBorders.MarginBorder
 {
+	private final int left, right, top, bottom;
+
+	public FlatMarginBorder() {
+		left = right = top = bottom = 0;
+	}
+
+	public FlatMarginBorder( Insets insets ) {
+		left = insets.left;
+		top = insets.top;
+		right = insets.right;
+		bottom = insets.bottom;
+	}
+
 	@Override
 	public Insets getBorderInsets( Component c, Insets insets ) {
 		insets = super.getBorderInsets( c, insets );
-		insets.top = scale( insets.top );
-		insets.left = scale( insets.left );
-		insets.bottom = scale( insets.bottom );
-		insets.right = scale( insets.right );
+		insets.top = scale( insets.top + top );
+		insets.left = scale( insets.left + left );
+		insets.bottom = scale( insets.bottom + bottom );
+		insets.right = scale( insets.right + right );
 		return insets;
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatMenuBarUI.java

@@ -16,13 +16,31 @@
 
 package com.formdev.flatlaf.ui;
 
+import java.awt.event.ActionEvent;
+import javax.swing.AbstractAction;
+import javax.swing.ActionMap;
 import javax.swing.JComponent;
+import javax.swing.JMenu;
+import javax.swing.JMenuBar;
+import javax.swing.MenuElement;
+import javax.swing.MenuSelectionManager;
+import javax.swing.SwingUtilities;
+import javax.swing.plaf.ActionMapUIResource;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicMenuBarUI;
+import com.formdev.flatlaf.FlatLaf;
+import com.formdev.flatlaf.util.SystemInfo;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JMenuBar}.
  *
+ * <!-- BasicMenuBarUI -->
+ *
+ * @uiDefault MenuBar.font								Font
+ * @uiDefault MenuBar.background						Color
+ * @uiDefault MenuBar.foreground						Color
+ * @uiDefault MenuBar.border							Border
+ *
  * @author Karl Tauber
  */
 public class FlatMenuBarUI
@@ -31,4 +49,45 @@ public class FlatMenuBarUI
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatMenuBarUI();
 	}
+
+	/*
+	 * WARNING: This class is not used on macOS if screen menu bar is enabled.
+	 *          Do not add any functionality here.
+	 */
+
+	@Override
+	protected void installKeyboardActions() {
+		super.installKeyboardActions();
+
+		ActionMap map = SwingUtilities.getUIActionMap( menuBar );
+		if( map == null ) {
+			map = new ActionMapUIResource();
+			SwingUtilities.replaceUIActionMap( menuBar, map );
+		}
+		map.put( "takeFocus", new TakeFocus() );
+	}
+
+	//---- class TakeFocus ----------------------------------------------------
+
+	/**
+	 * Activates the menu bar and shows mnemonics.
+	 * On Windows, the popup of the first menu is not shown.
+	 * On other platforms, the popup of the first menu is shown.
+	 */
+	private static class TakeFocus
+		extends AbstractAction
+	{
+		@Override
+		public void actionPerformed( ActionEvent e ) {
+			JMenuBar menuBar = (JMenuBar) e.getSource();
+			JMenu menu = menuBar.getMenu( 0 );
+			if( menu != null ) {
+				MenuSelectionManager.defaultManager().setSelectedPath( SystemInfo.IS_WINDOWS
+					? new MenuElement[] { menuBar, menu }
+					: new MenuElement[] { menuBar, menu, menu.getPopupMenu() } );
+
+				FlatLaf.showMnemonics( menuBar );
+			}
+		}
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatMenuItemBorder.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2020 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.ui;
+
+import static com.formdev.flatlaf.util.UIScale.scale;
+import java.awt.Component;
+import java.awt.Insets;
+import javax.swing.JMenuBar;
+import javax.swing.UIManager;
+
+/**
+ * Border for {@link javax.swing.JMenu}, {@link javax.swing.JMenuItem},
+ * {@link javax.swing.JCheckBoxMenuItem} and {@link javax.swing.JRadioButtonMenuItem}.
+ *
+ * @uiDefault MenuBar.itemMargins				Insets
+ *
+ * @author Karl Tauber
+ */
+public class FlatMenuItemBorder
+	extends FlatMarginBorder
+{
+	private final Insets menuBarItemMargins = UIManager.getInsets( "MenuBar.itemMargins" );
+
+	@Override
+	public Insets getBorderInsets( Component c, Insets insets ) {
+		if( c.getParent() instanceof JMenuBar ) {
+			insets.top = scale( menuBarItemMargins.top );
+			insets.left = scale( menuBarItemMargins.left );
+			insets.bottom = scale( menuBarItemMargins.bottom + 1 );
+			insets.right = scale( menuBarItemMargins.right );
+			return insets;
+		} else
+			return super.getBorderInsets( c, insets );
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatMenuItemRenderer.java

@@ -0,0 +1,516 @@
+/*
+ * Copyright 2020 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.ui;
+
+import static com.formdev.flatlaf.util.UIScale.scale;
+import java.awt.Color;
+import java.awt.Component;
+import java.awt.Dimension;
+import java.awt.Font;
+import java.awt.FontMetrics;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.Insets;
+import java.awt.Paint;
+import java.awt.Rectangle;
+import java.awt.event.InputEvent;
+import java.awt.event.KeyEvent;
+import java.text.AttributedCharacterIterator;
+import javax.swing.Icon;
+import javax.swing.JMenu;
+import javax.swing.JMenuItem;
+import javax.swing.KeyStroke;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+import javax.swing.plaf.basic.BasicHTML;
+import javax.swing.text.View;
+import com.formdev.flatlaf.FlatLaf;
+import com.formdev.flatlaf.util.Graphics2DProxy;
+
+/**
+ * Renderer for menu items.
+ *
+ * @uiDefault MenuItem.minimumWidth									int
+ * @uiDefault MenuItem.minimumIconSize								Dimension
+ * @uiDefault MenuItem.textAcceleratorGap							int
+ * @uiDefault MenuItem.textNoAcceleratorGap							int
+ * @uiDefault MenuItem.acceleratorArrowGap							int
+ * @uiDefault MenuItem.checkBackground								Color
+ * @uiDefault MenuItem.underlineSelectionBackground					Color
+ * @uiDefault MenuItem.underlineSelectionCheckBackground			Color
+ * @uiDefault MenuItem.underlineSelectionColor						Color
+ * @uiDefault MenuItem.underlineSelectionHeight						Color
+ *
+ * @author Karl Tauber
+ */
+public class FlatMenuItemRenderer
+{
+	protected final JMenuItem menuItem;
+	protected final Icon checkIcon;
+	protected final Icon arrowIcon;
+	protected final Font acceleratorFont;
+	protected final String acceleratorDelimiter;
+
+	protected final int minimumWidth = UIManager.getInt( "MenuItem.minimumWidth" );
+	protected final Dimension minimumIconSize;
+	protected final int textAcceleratorGap = FlatUIUtils.getUIInt( "MenuItem.textAcceleratorGap", 28 );
+	protected final int textNoAcceleratorGap = FlatUIUtils.getUIInt( "MenuItem.textNoAcceleratorGap", 6 );
+	protected final int acceleratorArrowGap = FlatUIUtils.getUIInt( "MenuItem.acceleratorArrowGap", 2 );
+
+	protected final Color checkBackground = UIManager.getColor( "MenuItem.checkBackground" );
+	protected final Insets checkMargins = UIManager.getInsets( "MenuItem.checkMargins" );
+
+	protected final Color underlineSelectionBackground = UIManager.getColor( "MenuItem.underlineSelectionBackground" );
+	protected final Color underlineSelectionCheckBackground = UIManager.getColor( "MenuItem.underlineSelectionCheckBackground" );
+	protected final Color underlineSelectionColor = UIManager.getColor( "MenuItem.underlineSelectionColor" );
+	protected final int underlineSelectionHeight = UIManager.getInt( "MenuItem.underlineSelectionHeight" );
+
+	protected FlatMenuItemRenderer( JMenuItem menuItem, Icon checkIcon, Icon arrowIcon,
+		Font acceleratorFont, String acceleratorDelimiter )
+	{
+		this.menuItem = menuItem;
+		this.checkIcon = checkIcon;
+		this.arrowIcon = arrowIcon;
+		this.acceleratorFont = acceleratorFont;
+		this.acceleratorDelimiter = acceleratorDelimiter;
+
+		Dimension minimumIconSize = UIManager.getDimension( "MenuItem.minimumIconSize" );
+		this.minimumIconSize = (minimumIconSize != null) ? minimumIconSize : new Dimension( 16, 16 );
+	}
+
+	protected Dimension getPreferredMenuItemSize() {
+		int width = 0;
+		int height = 0;
+		boolean isTopLevelMenu = isTopLevelMenu( menuItem );
+
+		Rectangle viewRect = new Rectangle( 0, 0, Integer.MAX_VALUE, Integer.MAX_VALUE );
+		Rectangle iconRect = new Rectangle();
+		Rectangle textRect = new Rectangle();
+
+		// layout icon and text
+		SwingUtilities.layoutCompoundLabel( menuItem,
+			menuItem.getFontMetrics( menuItem.getFont() ), menuItem.getText(), getIconForLayout(),
+			menuItem.getVerticalAlignment(), menuItem.getHorizontalAlignment(),
+			menuItem.getVerticalTextPosition(), menuItem.getHorizontalTextPosition(),
+			viewRect, iconRect, textRect, scale( menuItem.getIconTextGap() ) );
+
+		// union icon and text rectangles
+		Rectangle labelRect = iconRect.union( textRect );
+		width += labelRect.width;
+		height = Math.max( labelRect.height, height );
+
+		// accelerator size
+		String accelText = getAcceleratorText();
+		if( accelText != null ) {
+			// gap between text and accelerator
+			width += scale( !isTopLevelMenu ? textAcceleratorGap : menuItem.getIconTextGap() );
+
+			FontMetrics accelFm = menuItem.getFontMetrics( acceleratorFont );
+			width += SwingUtilities.computeStringWidth( accelFm, accelText );
+			height = Math.max( accelFm.getHeight(), height );
+		}
+
+		// arrow size
+		if( !isTopLevelMenu && arrowIcon != null ) {
+			// gap between text and arrow
+			if( accelText == null )
+				width += scale( textNoAcceleratorGap );
+
+			// gap between accelerator and arrow
+			width += scale( acceleratorArrowGap );
+
+			width += arrowIcon.getIconWidth();
+			height = Math.max( arrowIcon.getIconHeight(), height );
+		}
+
+		// add insets
+		Insets insets = menuItem.getInsets();
+		width += insets.left + insets.right;
+		height += insets.top + insets.bottom;
+
+		// minimum width
+		if( !isTopLevelMenu ) {
+			int minimumWidth = FlatUIUtils.minimumWidth( menuItem, this.minimumWidth );
+			width = Math.max( width, scale( minimumWidth ) );
+		}
+
+		return new Dimension( width, height );
+	}
+
+	private void layout( Rectangle viewRect, Rectangle iconRect, Rectangle textRect,
+		Rectangle accelRect, Rectangle arrowRect, Rectangle labelRect )
+	{
+		boolean isTopLevelMenu = isTopLevelMenu( menuItem );
+
+		// layout arrow
+		if( !isTopLevelMenu && arrowIcon != null ) {
+			arrowRect.width = arrowIcon.getIconWidth();
+			arrowRect.height = arrowIcon.getIconHeight();
+		} else
+			arrowRect.setSize( 0, 0 );
+		arrowRect.y = viewRect.y + centerOffset( viewRect.height, arrowRect.height );
+
+		// layout accelerator
+		String accelText = getAcceleratorText();
+		if( accelText != null ) {
+			FontMetrics accelFm = menuItem.getFontMetrics( acceleratorFont );
+			accelRect.width = SwingUtilities.computeStringWidth( accelFm, accelText );
+			accelRect.height = accelFm.getHeight();
+
+			accelRect.y = viewRect.y + centerOffset( viewRect.height, accelRect.height );
+		} else
+			accelRect.setBounds( 0, 0, 0, 0 );
+
+		// compute horizontal positions of accelerator and arrow
+		int accelArrowGap = !isTopLevelMenu ? scale( acceleratorArrowGap ) : 0;
+		if( menuItem.getComponentOrientation().isLeftToRight() ) {
+			// left-to-right
+			arrowRect.x = viewRect.x + viewRect.width - arrowRect.width;
+			accelRect.x = arrowRect.x - accelArrowGap - accelRect.width;
+		} else {
+			// right-to-left
+			arrowRect.x = viewRect.x;
+			accelRect.x = arrowRect.x + accelArrowGap + arrowRect.width;
+		}
+
+		// width of accelerator, arrow and gap
+		int accelArrowWidth = accelRect.width + arrowRect.width;
+		if( accelText != null )
+			accelArrowWidth += scale( !isTopLevelMenu ? textAcceleratorGap : menuItem.getIconTextGap() );
+		if( !isTopLevelMenu && arrowIcon != null ) {
+			if( accelText == null )
+				accelArrowWidth += scale( textNoAcceleratorGap );
+			accelArrowWidth += scale( acceleratorArrowGap );
+		}
+
+		// label rectangle is view rectangle subtracted by accelerator, arrow and gap
+		labelRect.setBounds( viewRect );
+		labelRect.width -= accelArrowWidth;
+		if( !menuItem.getComponentOrientation().isLeftToRight() )
+			labelRect.x += accelArrowWidth;
+
+		// layout icon and text
+		SwingUtilities.layoutCompoundLabel( menuItem,
+			menuItem.getFontMetrics( menuItem.getFont() ), menuItem.getText(), getIconForLayout(),
+			menuItem.getVerticalAlignment(), menuItem.getHorizontalAlignment(),
+			menuItem.getVerticalTextPosition(), menuItem.getHorizontalTextPosition(),
+			labelRect, iconRect, textRect, scale( menuItem.getIconTextGap() ) );
+	}
+
+	private static int centerOffset( int wh1, int wh2 ) {
+		return (wh1 / 2) - (wh2 / 2);
+	}
+
+	protected void paintMenuItem( Graphics g, Color selectionBackground, Color selectionForeground,
+		Color disabledForeground, Color acceleratorForeground, Color acceleratorSelectionForeground )
+	{
+		Rectangle viewRect = new Rectangle( menuItem.getWidth(), menuItem.getHeight() );
+
+		// subtract insets
+		Insets insets = menuItem.getInsets();
+		viewRect.x += insets.left;
+		viewRect.y += insets.top;
+		viewRect.width -= (insets.left + insets.right);
+		viewRect.height -= (insets.top + insets.bottom);
+
+		Rectangle iconRect = new Rectangle();
+		Rectangle textRect = new Rectangle();
+		Rectangle accelRect = new Rectangle();
+		Rectangle arrowRect = new Rectangle();
+		Rectangle labelRect = new Rectangle();
+
+		layout( viewRect, iconRect, textRect, accelRect, arrowRect, labelRect );
+
+/*debug
+		g.setColor( Color.green ); g.drawRect( viewRect.x, viewRect.y, viewRect.width - 1, viewRect.height - 1 );
+		g.setColor( Color.red ); g.drawRect( labelRect.x, labelRect.y, labelRect.width - 1, labelRect.height - 1 );
+		g.setColor( Color.blue ); g.drawRect( iconRect.x, iconRect.y, iconRect.width - 1, iconRect.height - 1 );
+		g.setColor( Color.cyan ); g.drawRect( textRect.x, textRect.y, textRect.width - 1, textRect.height - 1 );
+		g.setColor( Color.magenta ); g.drawRect( accelRect.x, accelRect.y, accelRect.width - 1, accelRect.height - 1 );
+		g.setColor( Color.orange ); g.drawRect( arrowRect.x, arrowRect.y, arrowRect.width - 1, arrowRect.height - 1 );
+debug*/
+
+		paintBackground( g, selectionBackground );
+		paintIcon( g, iconRect, getIconForPainting() );
+		paintText( g, textRect, menuItem.getText(), selectionForeground, disabledForeground );
+		paintAccelerator( g, accelRect, getAcceleratorText(), acceleratorForeground, acceleratorSelectionForeground, disabledForeground );
+		if( !isTopLevelMenu( menuItem ) )
+			paintArrowIcon( g, arrowRect, arrowIcon );
+	}
+
+	protected void paintBackground( Graphics g, Color selectionBackground ) {
+		boolean armedOrSelected = isArmedOrSelected( menuItem );
+		if( menuItem.isOpaque() || armedOrSelected ) {
+			int width = menuItem.getWidth();
+			int height = menuItem.getHeight();
+
+			// paint background
+			g.setColor( armedOrSelected
+				? (isUnderlineSelection() ? underlineSelectionBackground : selectionBackground)
+				: menuItem.getBackground() );
+			g.fillRect( 0, 0, width, height );
+
+			// paint underline
+			if( armedOrSelected && isUnderlineSelection() ) {
+				int underlineHeight = scale( underlineSelectionHeight );
+				g.setColor( underlineSelectionColor );
+				if( isTopLevelMenu( menuItem ) ) {
+					// paint underline at bottom
+					g.fillRect( 0, height - underlineHeight, width, underlineHeight );
+				} else if( menuItem.getComponentOrientation().isLeftToRight() ) {
+					// paint underline at left side
+					g.fillRect( 0, 0, underlineHeight, height );
+				} else {
+					// paint underline at right side
+					g.fillRect( width - underlineHeight, 0, underlineHeight, height );
+				}
+			}
+		}
+	}
+
+	protected void paintIcon( Graphics g, Rectangle iconRect, Icon icon ) {
+		// if checkbox/radiobutton menu item is selected and also has a custom icon,
+		// then use filled icon background to indicate selection (instead of using checkIcon)
+		if( menuItem.isSelected() && checkIcon != null && icon != checkIcon ) {
+			Rectangle r = FlatUIUtils.addInsets( iconRect, scale( checkMargins ) );
+			g.setColor( isUnderlineSelection() ? underlineSelectionCheckBackground : checkBackground );
+			g.fillRect( r.x, r.y, r.width, r.height );
+		}
+
+		paintIcon( g, menuItem, icon, iconRect );
+	}
+
+	protected void paintText( Graphics g, Rectangle textRect, String text, Color selectionForeground, Color disabledForeground ) {
+		View htmlView = (View) menuItem.getClientProperty( BasicHTML.propertyKey );
+		if( htmlView != null ) {
+			paintHTMLText( g, menuItem, textRect, htmlView, isUnderlineSelection() ? null : selectionForeground );
+			return;
+		}
+
+		int mnemonicIndex = FlatLaf.isShowMnemonics() ? menuItem.getDisplayedMnemonicIndex() : -1;
+		Color foreground = menuItem.getForeground();
+
+		paintText( g, menuItem, textRect, text, mnemonicIndex, menuItem.getFont(),
+			foreground, isUnderlineSelection() ? foreground : selectionForeground, disabledForeground );
+	}
+
+	protected void paintAccelerator( Graphics g, Rectangle accelRect, String accelText,
+		Color foreground, Color selectionForeground, Color disabledForeground )
+	{
+		paintText( g, menuItem, accelRect, accelText, -1, acceleratorFont,
+			foreground, isUnderlineSelection() ? foreground : selectionForeground, disabledForeground );
+	}
+
+	protected void paintArrowIcon( Graphics g, Rectangle arrowRect, Icon arrowIcon ) {
+		paintIcon( g, menuItem, arrowIcon, arrowRect );
+	}
+
+	protected static void paintIcon( Graphics g, JMenuItem menuItem, Icon icon, Rectangle iconRect ) {
+		if( icon == null )
+			return;
+
+		// center because the real icon may be smaller than dimension in iconRect
+		int x = iconRect.x + centerOffset( iconRect.width, icon.getIconWidth() );
+		int y = iconRect.y + centerOffset( iconRect.height, icon.getIconHeight() );
+
+		// paint
+		icon.paintIcon( menuItem, g, x, y );
+	}
+
+	protected static void paintText( Graphics g, JMenuItem menuItem,
+		Rectangle textRect, String text, int mnemonicIndex, Font font,
+		Color foreground, Color selectionForeground, Color disabledForeground )
+	{
+		if( text == null || text.isEmpty() )
+			return;
+
+		FontMetrics fm = menuItem.getFontMetrics( font );
+
+		Font oldFont = g.getFont();
+		g.setFont( font );
+		g.setColor( !menuItem.isEnabled()
+			? disabledForeground
+			: (isArmedOrSelected( menuItem )
+				? selectionForeground
+				: foreground) );
+
+		FlatUIUtils.drawStringUnderlineCharAt( menuItem, g, text, mnemonicIndex,
+			textRect.x, textRect.y + fm.getAscent() );
+
+		g.setFont( oldFont );
+	}
+
+	protected static void paintHTMLText( Graphics g, JMenuItem menuItem,
+		Rectangle textRect, View htmlView, Color selectionForeground )
+	{
+		if( isArmedOrSelected( menuItem ) && selectionForeground != null )
+			g = new GraphicsProxyWithTextColor( (Graphics2D) g, selectionForeground );
+
+		htmlView.paint( g, textRect );
+	}
+
+	protected static boolean isArmedOrSelected( JMenuItem menuItem ) {
+		return menuItem.isArmed() || (menuItem instanceof JMenu && menuItem.isSelected());
+	}
+
+	protected static boolean isTopLevelMenu( JMenuItem menuItem ) {
+		return menuItem instanceof JMenu && ((JMenu)menuItem).isTopLevelMenu();
+	}
+
+	private boolean isUnderlineSelection() {
+		return "underline".equals( UIManager.getString( "MenuItem.selectionType" ) );
+	}
+
+	private Icon getIconForPainting() {
+		Icon icon = menuItem.getIcon();
+
+		if( icon == null && checkIcon != null && !isTopLevelMenu( menuItem ) )
+			return checkIcon;
+
+		if( icon == null )
+			return null;
+
+		if( !menuItem.isEnabled() )
+			return menuItem.getDisabledIcon();
+
+		if( menuItem.getModel().isPressed() && menuItem.isArmed() ) {
+			Icon pressedIcon = menuItem.getPressedIcon();
+			if( pressedIcon != null )
+				return pressedIcon;
+		}
+
+		return icon;
+	}
+
+	private Icon getIconForLayout() {
+		Icon icon = menuItem.getIcon();
+
+		if( isTopLevelMenu( menuItem ) )
+			return (icon != null) ? new MinSizeIcon( icon ) : null;
+
+		return new MinSizeIcon( (icon != null) ? icon : checkIcon );
+	}
+
+	private KeyStroke cachedAccelerator;
+	private String cachedAcceleratorText;
+
+	private String getAcceleratorText() {
+		KeyStroke accelerator = menuItem.getAccelerator();
+		if( accelerator == null )
+			return null;
+
+		if( accelerator == cachedAccelerator )
+			return cachedAcceleratorText;
+
+		StringBuilder buf = new StringBuilder();
+		int modifiers = accelerator.getModifiers();
+		if( modifiers != 0 )
+			buf.append( InputEvent.getModifiersExText( modifiers ) ).append( acceleratorDelimiter );
+
+		int keyCode = accelerator.getKeyCode();
+		if( keyCode != 0 )
+			buf.append( KeyEvent.getKeyText( keyCode ) );
+		else
+			buf.append( accelerator.getKeyChar() );
+
+		cachedAccelerator = accelerator;
+		cachedAcceleratorText = buf.toString();
+
+		return cachedAcceleratorText;
+	}
+
+	//---- class MinSizeIcon --------------------------------------------------
+
+	private class MinSizeIcon
+		implements Icon
+	{
+		private final Icon delegate;
+
+		MinSizeIcon( Icon delegate ) {
+			this.delegate = delegate;
+		}
+
+		@Override
+		public int getIconWidth() {
+			int iconWidth = (delegate != null) ? delegate.getIconWidth() : 0;
+			return Math.max( iconWidth, scale( minimumIconSize.width ) );
+		}
+
+		@Override
+		public int getIconHeight() {
+			int iconHeight = (delegate != null) ? delegate.getIconHeight() : 0;
+			return Math.max( iconHeight, scale( minimumIconSize.height ) );
+		}
+
+		@Override
+		public void paintIcon( Component c, Graphics g, int x, int y ) {
+		}
+	}
+
+	//---- class GraphicsProxyWithTextColor -----------------------------------
+
+	private static class GraphicsProxyWithTextColor
+		extends Graphics2DProxy
+	{
+		private final Color textColor;
+
+		GraphicsProxyWithTextColor( Graphics2D delegate, Color textColor ) {
+			super( delegate );
+			this.textColor = textColor;
+		}
+
+		@Override
+		public void drawString( String str, int x, int y ) {
+			Paint oldPaint = getPaint();
+			setPaint( textColor );
+			super.drawString( str, x, y );
+			setPaint( oldPaint );
+		}
+
+		@Override
+		public void drawString( String str, float x, float y ) {
+			Paint oldPaint = getPaint();
+			setPaint( textColor );
+			super.drawString( str, x, y );
+			setPaint( oldPaint );
+		}
+
+		@Override
+		public void drawString( AttributedCharacterIterator iterator, int x, int y ) {
+			Paint oldPaint = getPaint();
+			setPaint( textColor );
+			super.drawString( iterator, x, y );
+			setPaint( oldPaint );
+		}
+
+		@Override
+		public void drawString( AttributedCharacterIterator iterator, float x, float y ) {
+			Paint oldPaint = getPaint();
+			setPaint( textColor );
+			super.drawString( iterator, x, y );
+			setPaint( oldPaint );
+		}
+
+		@Override
+		public void drawChars( char[] data, int offset, int length, int x, int y ) {
+			Paint oldPaint = getPaint();
+			setPaint( textColor );
+			super.drawChars( data, offset, length, x, y );
+			setPaint( oldPaint );
+		}
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatMenuItemUI.java

@@ -16,20 +16,47 @@
 
 package com.formdev.flatlaf.ui;
 
-import static com.formdev.flatlaf.util.UIScale.scale;
-import java.beans.PropertyChangeListener;
+import java.awt.Dimension;
+import java.awt.Graphics;
+import javax.swing.Icon;
 import javax.swing.JComponent;
+import javax.swing.LookAndFeel;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicMenuItemUI;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JMenuItem}.
  *
+ * <!-- BasicMenuItemUI -->
+ *
+ * @uiDefault MenuItem.font											Font
+ * @uiDefault MenuItem.background									Color
+ * @uiDefault MenuItem.foreground									Color
+ * @uiDefault MenuItem.disabledForeground							Color
+ * @uiDefault MenuItem.selectionBackground							Color
+ * @uiDefault MenuItem.selectionForeground							Color
+ * @uiDefault MenuItem.acceleratorForeground						Color
+ * @uiDefault MenuItem.acceleratorSelectionForeground				Color
+ * @uiDefault MenuItem.acceleratorFont								Font		defaults to MenuItem.font
+ * @uiDefault MenuItem.acceleratorDelimiter							String
+ * @uiDefault MenuItem.border										Border
+ * @uiDefault MenuItem.borderPainted								boolean
+ * @uiDefault MenuItem.margin										Insets
+ * @uiDefault MenuItem.arrowIcon									Icon
+ * @uiDefault MenuItem.checkIcon									Icon
+ * @uiDefault MenuItem.opaque										boolean
+ *
+ * <!-- FlatMenuItemUI -->
+ *
+ * @uiDefault MenuItem.iconTextGap									int
+ *
  * @author Karl Tauber
  */
 public class FlatMenuItemUI
 	extends BasicMenuItemUI
 {
+	private FlatMenuItemRenderer renderer;
+
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatMenuItemUI();
 	}
@@ -38,20 +65,30 @@ public class FlatMenuItemUI
 	protected void installDefaults() {
 		super.installDefaults();
 
-		// scale
-		defaultTextIconGap = scale( defaultTextIconGap );
+		LookAndFeel.installProperty( menuItem, "iconTextGap", FlatUIUtils.getUIInt( "MenuItem.iconTextGap", 4 ) );
+
+		renderer = createRenderer();
 	}
 
-	/**
-	 * Scale defaultTextIconGap again if iconTextGap property has changed.
-	 */
 	@Override
-	protected PropertyChangeListener createPropertyChangeListener( JComponent c ) {
-		PropertyChangeListener superListener = super.createPropertyChangeListener( c );
-		return e -> {
-			superListener.propertyChange( e );
-			if( e.getPropertyName() == "iconTextGap" )
-				defaultTextIconGap = scale( defaultTextIconGap );
-		};
+	protected void uninstallDefaults() {
+		super.uninstallDefaults();
+
+		renderer = null;
+	}
+
+	protected FlatMenuItemRenderer createRenderer() {
+		return new FlatMenuItemRenderer( menuItem, checkIcon, arrowIcon, acceleratorFont, acceleratorDelimiter );
+	}
+
+	@Override
+	protected Dimension getPreferredMenuItemSize( JComponent c, Icon checkIcon, Icon arrowIcon, int defaultTextIconGap ) {
+		return renderer.getPreferredMenuItemSize();
+	}
+
+	@Override
+	public void paint( Graphics g, JComponent c ) {
+		renderer.paintMenuItem( g, selectionBackground, selectionForeground, disabledForeground,
+			acceleratorForeground, acceleratorSelectionForeground );
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatMenuUI.java

@@ -16,20 +16,60 @@
 
 package com.formdev.flatlaf.ui;
 
-import static com.formdev.flatlaf.util.UIScale.scale;
-import java.beans.PropertyChangeListener;
+import java.awt.Color;
+import java.awt.Dimension;
+import java.awt.Font;
+import java.awt.Graphics;
+import java.awt.event.MouseEvent;
+import javax.swing.ButtonModel;
+import javax.swing.Icon;
 import javax.swing.JComponent;
+import javax.swing.JMenu;
+import javax.swing.JMenuItem;
+import javax.swing.LookAndFeel;
+import javax.swing.UIManager;
+import javax.swing.event.MouseInputListener;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicMenuUI;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JMenu}.
  *
+ * <!-- BasicMenuUI -->
+ *
+ * @uiDefault Menu.font												Font
+ * @uiDefault Menu.background										Color
+ * @uiDefault Menu.foreground										Color
+ * @uiDefault Menu.disabledForeground								Color
+ * @uiDefault Menu.selectionBackground								Color
+ * @uiDefault Menu.selectionForeground								Color
+ * @uiDefault Menu.acceleratorForeground							Color
+ * @uiDefault Menu.acceleratorSelectionForeground					Color
+ * @uiDefault MenuItem.acceleratorFont								Font		defaults to MenuItem.font
+ * @uiDefault MenuItem.acceleratorDelimiter							String
+ * @uiDefault Menu.border											Border
+ * @uiDefault Menu.borderPainted									boolean
+ * @uiDefault Menu.margin											Insets
+ * @uiDefault Menu.arrowIcon										Icon
+ * @uiDefault Menu.checkIcon										Icon
+ * @uiDefault Menu.opaque											boolean
+ * @uiDefault Menu.crossMenuMnemonic								boolean	default is false
+ * @uiDefault Menu.useMenuBarBackgroundForTopLevel					boolean	default is false
+ * @uiDefault MenuBar.background									Color	used if Menu.useMenuBarBackgroundForTopLevel is true
+ *
+ * <!-- FlatMenuUI -->
+ *
+ * @uiDefault MenuItem.iconTextGap									int
+ * @uiDefault MenuBar.hoverBackground								Color
+ *
  * @author Karl Tauber
  */
 public class FlatMenuUI
 	extends BasicMenuUI
 {
+	private Color hoverBackground;
+	private FlatMenuItemRenderer renderer;
+
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatMenuUI();
 	}
@@ -38,20 +78,83 @@ public class FlatMenuUI
 	protected void installDefaults() {
 		super.installDefaults();
 
-		// scale
-		defaultTextIconGap = scale( defaultTextIconGap );
+		LookAndFeel.installProperty( menuItem, "iconTextGap", FlatUIUtils.getUIInt( "MenuItem.iconTextGap", 4 ) );
+
+		menuItem.setRolloverEnabled( true );
+
+		hoverBackground = UIManager.getColor( "MenuBar.hoverBackground" );
+		renderer = createRenderer();
 	}
 
-	/**
-	 * Scale defaultTextIconGap again if iconTextGap property has changed.
-	 */
 	@Override
-	protected PropertyChangeListener createPropertyChangeListener( JComponent c ) {
-		PropertyChangeListener superListener = super.createPropertyChangeListener( c );
-		return e -> {
-			superListener.propertyChange( e );
-			if( e.getPropertyName() == "iconTextGap" )
-				defaultTextIconGap = scale( defaultTextIconGap );
+	protected void uninstallDefaults() {
+		super.uninstallDefaults();
+
+		hoverBackground = null;
+		renderer = null;
+	}
+
+	protected FlatMenuItemRenderer createRenderer() {
+		return new FlatMenuRenderer( menuItem, checkIcon, arrowIcon, acceleratorFont, acceleratorDelimiter );
+	}
+
+	@Override
+	protected MouseInputListener createMouseInputListener( JComponent c ) {
+		return new BasicMenuUI.MouseInputHandler() {
+			@Override
+			public void mouseEntered( MouseEvent e ) {
+				super.mouseEntered( e );
+				rollover( e, true );
+			}
+
+			@Override
+			public void mouseExited( MouseEvent e ) {
+				super.mouseExited( e );
+				rollover( e, false );
+			}
+
+			private void rollover( MouseEvent e, boolean rollover ) {
+				JMenu menu = (JMenu) e.getSource();
+				if( menu.isTopLevelMenu() && menu.isRolloverEnabled() ) {
+					menu.getModel().setRollover( rollover );
+					menu.repaint();
+				}
+			}
 		};
 	}
+
+	@Override
+	protected Dimension getPreferredMenuItemSize( JComponent c, Icon checkIcon, Icon arrowIcon, int defaultTextIconGap ) {
+		return renderer.getPreferredMenuItemSize();
+	}
+
+	@Override
+	public void paint( Graphics g, JComponent c ) {
+		renderer.paintMenuItem( g, selectionBackground, selectionForeground, disabledForeground,
+			acceleratorForeground, acceleratorSelectionForeground );
+	}
+
+	//---- class FlatMenuRenderer ---------------------------------------------
+
+	protected class FlatMenuRenderer
+		extends FlatMenuItemRenderer
+	{
+		protected FlatMenuRenderer( JMenuItem menuItem, Icon checkIcon, Icon arrowIcon,
+			Font acceleratorFont, String acceleratorDelimiter )
+		{
+			super( menuItem, checkIcon, arrowIcon, acceleratorFont, acceleratorDelimiter );
+		}
+
+		@Override
+		protected void paintBackground( Graphics g, Color selectionBackground ) {
+			ButtonModel model = menuItem.getModel();
+			if( model.isRollover() && !model.isArmed() && !model.isSelected() &&
+				model.isEnabled() && ((JMenu)menuItem).isTopLevelMenu() )
+			{
+				g.setColor( FlatUIUtils.deriveColor( hoverBackground, menuItem.getBackground() ) );
+				g.fillRect( 0, 0, menuItem.getWidth(), menuItem.getHeight() );
+			} else
+				super.paintBackground( g, selectionBackground );
+		}
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatOptionPaneUI.java

@@ -19,10 +19,15 @@ package com.formdev.flatlaf.ui;
 import java.awt.Component;
 import java.awt.Container;
 import java.awt.Dimension;
+import java.awt.Graphics;
 import java.awt.GridBagConstraints;
+import java.awt.Insets;
 import javax.swing.JComponent;
+import javax.swing.JPanel;
 import javax.swing.UIManager;
+import javax.swing.border.Border;
 import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicHTML;
 import javax.swing.plaf.basic.BasicOptionPaneUI;
 import com.formdev.flatlaf.util.UIScale;
@@ -30,17 +35,19 @@ import com.formdev.flatlaf.util.UIScale;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JOptionPane}.
  *
+ * <!-- BasicOptionPaneUI -->
+ *
+ * @uiDefault OptionPane.font						Font	unused
+ * @uiDefault OptionPane.background					Color
+ * @uiDefault OptionPane.foreground					Color	unused
  * @uiDefault OptionPane.border						Border
  * @uiDefault OptionPane.messageAreaBorder			Border
  * @uiDefault OptionPane.buttonAreaBorder			Border
- * @uiDefault OptionPane.messageForeground			Color
- * @uiDefault OptionPane.messageFont				Font
- * @uiDefault OptionPane.buttonFont					Font
+ * @uiDefault OptionPane.messageForeground			Color	optional; defaults to Label.foreground
+ * @uiDefault OptionPane.messageFont				Font	optional; defaults to Label.font
+ * @uiDefault OptionPane.buttonFont					Font	optional; defaults to Button.font
  *
  * @uiDefault OptionPane.minimumSize				Dimension
- * @uiDefault OptionPane.maxCharactersPerLine		int
- * @uiDefault OptionPane.iconMessageGap				int
- * @uiDefault OptionPane.messagePadding				int
  * @uiDefault OptionPane.buttonPadding				int
  * @uiDefault OptionPane.buttonMinimumWidth			int		-1=disabled
  * @uiDefault OptionPane.sameSizeButtons			boolean	if true, gives all buttons same size
@@ -53,6 +60,25 @@ import com.formdev.flatlaf.util.UIScale;
  * @uiDefault OptionPane.questionIcon				Icon
  * @uiDefault OptionPane.warningIcon				Icon
  *
+ * @uiDefault OptionPane.okButtonText				String
+ * @uiDefault OptionPane.okButtonMnemonic			String
+ * @uiDefault OptionPane.okIcon						Icon
+ * @uiDefault OptionPane.cancelButtonText			String
+ * @uiDefault OptionPane.cancelButtonMnemonic		String
+ * @uiDefault OptionPane.cancelIcon					Icon
+ * @uiDefault OptionPane.yesButtonText				String
+ * @uiDefault OptionPane.yesButtonMnemonic			String
+ * @uiDefault OptionPane.yesIcon					Icon
+ * @uiDefault OptionPane.noButtonText				String
+ * @uiDefault OptionPane.noButtonMnemonic			String
+ * @uiDefault OptionPane.noIcon						Icon
+ *
+ * <!-- FlatOptionPaneUI -->
+ *
+ * @uiDefault OptionPane.iconMessageGap				int
+ * @uiDefault OptionPane.messagePadding				int
+ * @uiDefault OptionPane.maxCharactersPerLine		int
+ *
  * @author Karl Tauber
  */
 public class FlatOptionPaneUI
@@ -77,6 +103,13 @@ public class FlatOptionPaneUI
 		focusWidth = UIManager.getInt( "Component.focusWidth" );
 	}
 
+	@Override
+	protected void installComponents() {
+		super.installComponents();
+
+		updateChildPanels( optionPane );
+	}
+
 	@Override
 	public Dimension getMinimumOptionPaneSize() {
 		return UIScale.scale( super.getMinimumOptionPaneSize() );
@@ -130,6 +163,26 @@ public class FlatOptionPaneUI
 		super.addMessageComponents( container, cons, msg, maxll, internallyCreated );
 	}
 
+	private void updateChildPanels( Container c ) {
+		for( Component child : c.getComponents() ) {
+			if( child instanceof JPanel ) {
+				JPanel panel = (JPanel)child;
+
+				// make sub-panel non-opaque for OptionPane.background
+				panel.setOpaque( false );
+
+				// use non-UIResource borders to avoid that they are replaced when switching LaF
+				Border border = panel.getBorder();
+				if( border instanceof UIResource )
+					panel.setBorder( new NonUIResourceBorder( border ) );
+			}
+
+			if( child instanceof Container ) {
+				updateChildPanels( (Container) child );
+			}
+		}
+	}
+
 	private Component findByName( Container c, String name ) {
 		for( Component child : c.getComponents() ) {
 			if( name.equals( child.getName() ) )
@@ -143,4 +196,31 @@ public class FlatOptionPaneUI
 		}
 		return null;
 	}
+
+	//---- class NonUIResourceBorder ------------------------------------------
+
+	private static class NonUIResourceBorder
+		implements Border
+	{
+		private final Border delegate;
+
+		NonUIResourceBorder( Border delegate ) {
+			this.delegate = delegate;
+		}
+
+		@Override
+		public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
+			delegate.paintBorder( c, g, x, y, width, height );
+		}
+
+		@Override
+		public Insets getBorderInsets( Component c ) {
+			return delegate.getBorderInsets( c );
+		}
+
+		@Override
+		public boolean isBorderOpaque() {
+			return delegate.isBorderOpaque();
+		}
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatPanelUI.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2020 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.ui;
+
+import javax.swing.JComponent;
+import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.basic.BasicPanelUI;
+
+/**
+ * Provides the Flat LaF UI delegate for {@link javax.swing.JPanel}.
+ *
+ * <!-- BasicPanelUI -->
+ *
+ * @uiDefault Panel.font				Font	unused
+ * @uiDefault Panel.background			Color	only used if opaque
+ * @uiDefault Panel.foreground			Color
+ * @uiDefault Panel.border				Border
+ *
+ * @author Karl Tauber
+ */
+public class FlatPanelUI
+	extends BasicPanelUI
+{
+	private static ComponentUI instance;
+
+	public static ComponentUI createUI( JComponent c ) {
+		if( instance == null )
+			instance = new FlatPanelUI();
+		return instance;
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatPasswordFieldUI.java

@@ -16,34 +16,63 @@
 
 package com.formdev.flatlaf.ui;
 
-import static com.formdev.flatlaf.util.UIScale.scale;
+import java.awt.Color;
 import java.awt.Dimension;
 import java.awt.Graphics;
+import java.awt.Toolkit;
 import java.awt.event.FocusListener;
+import java.awt.event.KeyAdapter;
+import java.awt.event.KeyEvent;
+import java.awt.event.KeyListener;
+import java.beans.PropertyChangeEvent;
+import javax.swing.Icon;
 import javax.swing.JComponent;
 import javax.swing.LookAndFeel;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicPasswordFieldUI;
-import com.formdev.flatlaf.util.SystemInfo;
+import javax.swing.text.Caret;
+import javax.swing.text.JTextComponent;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JPasswordField}.
  *
- * TODO document used UI defaults of superclass
+ * <!-- BasicPasswordFieldUI -->
  *
- * @uiDefault Component.focusWidth				int
- * @uiDefault Component.minimumWidth			int
+ * @uiDefault PasswordField.font					Font
+ * @uiDefault PasswordField.background				Color
+ * @uiDefault PasswordField.foreground				Color	also used if not editable
+ * @uiDefault PasswordField.caretForeground			Color
+ * @uiDefault PasswordField.selectionBackground		Color
+ * @uiDefault PasswordField.selectionForeground		Color
+ * @uiDefault PasswordField.disabledBackground		Color	used if not enabled
+ * @uiDefault PasswordField.inactiveBackground		Color	used if not editable
+ * @uiDefault PasswordField.inactiveForeground		Color	used if not enabled (yes, this is confusing; this should be named disabledForeground)
+ * @uiDefault PasswordField.border					Border
+ * @uiDefault PasswordField.margin					Insets
+ * @uiDefault PasswordField.echoChar				character
+ * @uiDefault PasswordField.caretBlinkRate			int		default is 500 milliseconds
+ *
+ * <!-- FlatPasswordFieldUI -->
+ *
+ * @uiDefault Component.minimumWidth				int
+ * @uiDefault Component.isIntelliJTheme				boolean
+ * @uiDefault PasswordField.placeholderForeground	Color
+ * @uiDefault PasswordField.capsLockIcon			Icon
+ * @uiDefault TextComponent.selectAllOnFocusPolicy	String	never, once (default) or always
  *
  * @author Karl Tauber
  */
 public class FlatPasswordFieldUI
 	extends BasicPasswordFieldUI
 {
-	protected int focusWidth;
 	protected int minimumWidth;
+	protected boolean isIntelliJTheme;
+	protected Color placeholderForeground;
+	protected Icon capsLockIcon;
 
 	private FocusListener focusListener;
+	private KeyListener capsLockListener;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatPasswordFieldUI();
@@ -53,22 +82,24 @@ public class FlatPasswordFieldUI
 	protected void installDefaults() {
 		super.installDefaults();
 
-		// use other echoChar on Mac because the default is too large in SF font
-		if( SystemInfo.IS_MAC )
-			LookAndFeel.installProperty( getComponent(), "echoChar", '\u2022' );
-
-		focusWidth = UIManager.getInt( "Component.focusWidth" );
+		String prefix = getPropertyPrefix();
 		minimumWidth = UIManager.getInt( "Component.minimumWidth" );
+		isIntelliJTheme = UIManager.getBoolean( "Component.isIntelliJTheme" );
+		placeholderForeground = UIManager.getColor( prefix + ".placeholderForeground" );
+		capsLockIcon = UIManager.getIcon( "PasswordField.capsLockIcon" );
 
-		LookAndFeel.installProperty( getComponent(), "opaque", focusWidth == 0 );
+		LookAndFeel.installProperty( getComponent(), "opaque", false );
 
-		MigLayoutVisualPadding.install( getComponent(), focusWidth );
+		MigLayoutVisualPadding.install( getComponent() );
 	}
 
 	@Override
 	protected void uninstallDefaults() {
 		super.uninstallDefaults();
 
+		placeholderForeground = null;
+		capsLockIcon = null;
+
 		MigLayoutVisualPadding.uninstall( getComponent() );
 	}
 
@@ -77,7 +108,23 @@ public class FlatPasswordFieldUI
 		super.installListeners();
 
 		focusListener = new FlatUIUtils.RepaintFocusListener( getComponent() );
+		capsLockListener = new KeyAdapter() {
+			@Override
+			public void keyPressed( KeyEvent e ) {
+				repaint( e );
+			}
+			@Override
+			public void keyReleased( KeyEvent e ) {
+				repaint( e );
+			}
+			private void repaint( KeyEvent e ) {
+				if( e.getKeyCode() == KeyEvent.VK_CAPS_LOCK )
+					e.getComponent().repaint();
+			}
+		};
+
 		getComponent().addFocusListener( focusListener );
+		getComponent().addKeyListener( capsLockListener );
 	}
 
 	@Override
@@ -85,15 +132,41 @@ public class FlatPasswordFieldUI
 		super.uninstallListeners();
 
 		getComponent().removeFocusListener( focusListener );
+		getComponent().removeKeyListener( capsLockListener );
 		focusListener = null;
+		capsLockListener = null;
+	}
+
+	@Override
+	protected Caret createCaret() {
+		return new FlatCaret( UIManager.getString( "TextComponent.selectAllOnFocusPolicy" ) );
+	}
+
+	@Override
+	protected void propertyChange( PropertyChangeEvent e ) {
+		super.propertyChange( e );
+		FlatTextFieldUI.propertyChange( getComponent(), e );
 	}
 
 	@Override
 	protected void paintSafely( Graphics g ) {
-		FlatTextFieldUI.paintBackground( g, getComponent(), focusWidth );
+		FlatTextFieldUI.paintBackground( g, getComponent(), isIntelliJTheme );
+		FlatTextFieldUI.paintPlaceholder( g, getComponent(), placeholderForeground );
+		paintCapsLock( g );
 		super.paintSafely( g );
 	}
 
+	protected void paintCapsLock( Graphics g ) {
+		JTextComponent c = getComponent();
+		if( !FlatUIUtils.isPermanentFocusOwner( c ) ||
+			!Toolkit.getDefaultToolkit().getLockingKeyState( KeyEvent.VK_CAPS_LOCK ) )
+		  return;
+
+		int y = (c.getHeight() - capsLockIcon.getIconHeight()) / 2;
+		int x = c.getWidth() - capsLockIcon.getIconWidth() - y;
+		capsLockIcon.paintIcon( c, g, x, y );
+	}
+
 	@Override
 	protected void paintBackground( Graphics g ) {
 		// background is painted elsewhere
@@ -101,17 +174,11 @@ public class FlatPasswordFieldUI
 
 	@Override
 	public Dimension getPreferredSize( JComponent c ) {
-		return applyMinimumWidth( super.getPreferredSize( c ), c );
+		return FlatTextFieldUI.applyMinimumWidth( c, super.getPreferredSize( c ), minimumWidth );
 	}
 
 	@Override
 	public Dimension getMinimumSize( JComponent c ) {
-		return applyMinimumWidth( super.getMinimumSize( c ), c );
-	}
-
-	private Dimension applyMinimumWidth( Dimension size, JComponent c ) {
-		int focusWidth = (c.getBorder() instanceof FlatBorder) ? this.focusWidth : 0;
-		size.width = Math.max( size.width, scale( minimumWidth + (focusWidth * 2) ) );
-		return size;
+		return FlatTextFieldUI.applyMinimumWidth( c, super.getMinimumSize( c ), minimumWidth );
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatPopupFactory.java

@@ -0,0 +1,375 @@
+/*
+ * Copyright 2020 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.ui;
+
+import java.awt.Color;
+import java.awt.Component;
+import java.awt.Container;
+import java.awt.Dimension;
+import java.awt.Insets;
+import java.awt.Panel;
+import java.awt.Point;
+import java.awt.Rectangle;
+import java.awt.Window;
+import java.awt.event.ComponentEvent;
+import java.awt.event.ComponentListener;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import javax.swing.JComponent;
+import javax.swing.JLayeredPane;
+import javax.swing.JPanel;
+import javax.swing.Popup;
+import javax.swing.PopupFactory;
+import javax.swing.RootPaneContainer;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+import javax.swing.border.Border;
+import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.util.SystemInfo;
+
+/**
+ * A popup factory that adds drop shadows to popups on Windows.
+ * On macOS and Linux, heavy weight popups (without drop shadow) are produced and the
+ * operating system automatically adds drop shadows.
+ *
+ * @author Karl Tauber
+ */
+public class FlatPopupFactory
+	extends PopupFactory
+{
+	private Method java8getPopupMethod;
+	private Method java9getPopupMethod;
+
+	@Override
+	public Popup getPopup( Component owner, Component contents, int x, int y )
+		throws IllegalArgumentException
+	{
+		if( !isDropShadowPainted( owner, contents ) )
+			return new NonFlashingPopup( super.getPopup( owner, contents, x, y ), contents );
+
+		// macOS and Linux adds drop shadow to heavy weight popups
+		if( SystemInfo.IS_MAC || SystemInfo.IS_LINUX ) {
+			Popup popup = getHeavyWeightPopup( owner, contents, x, y );
+			if( popup == null )
+				popup = super.getPopup( owner, contents, x, y );
+			return new NonFlashingPopup( popup, contents );
+		}
+
+		// create drop shadow popup
+		return new DropShadowPopup( super.getPopup( owner, contents, x, y ), owner, contents );
+	}
+
+	private boolean isDropShadowPainted( Component owner, Component contents ) {
+		Boolean b = isDropShadowPainted( owner );
+		if( b != null )
+			return b;
+
+		b = isDropShadowPainted( contents );
+		if( b != null )
+			return b;
+
+		return UIManager.getBoolean( "Popup.dropShadowPainted" );
+	}
+
+	private Boolean isDropShadowPainted( Component c ) {
+		if( !(c instanceof JComponent) )
+			return null;
+
+		Object value = ((JComponent)c).getClientProperty( FlatClientProperties.POPUP_DROP_SHADOW_PAINTED );
+		return (value instanceof Boolean ) ? (Boolean) value : null;
+	}
+
+	/**
+	 * There is no API in Java 8 to force creation of heavy weight popups,
+	 * but it is possible with reflection. Java 9 provides a new method.
+	 *
+	 * When changing FlatLaf system requirements to Java 9+,
+	 * then this method can be replaced with:
+	 *    return getPopup( owner, contents, x, y, true );
+	 */
+	private Popup getHeavyWeightPopup( Component owner, Component contents, int x, int y )
+		throws IllegalArgumentException
+	{
+		try {
+			if( SystemInfo.IS_JAVA_9_OR_LATER ) {
+				if( java9getPopupMethod == null ) {
+					java9getPopupMethod = PopupFactory.class.getDeclaredMethod(
+						"getPopup", Component.class, Component.class, int.class, int.class, boolean.class );
+				}
+				return (Popup) java9getPopupMethod.invoke( this, owner, contents, x, y, true );
+			} else {
+				// Java 8
+				if( java8getPopupMethod == null ) {
+					java8getPopupMethod = PopupFactory.class.getDeclaredMethod(
+						"getPopup", Component.class, Component.class, int.class, int.class, int.class );
+					java8getPopupMethod.setAccessible( true );
+				}
+				return (Popup) java8getPopupMethod.invoke( this, owner, contents, x, y, /*HEAVY_WEIGHT_POPUP*/ 2 );
+			}
+		} catch( NoSuchMethodException | SecurityException | IllegalAccessException | InvocationTargetException ex ) {
+			// ignore
+			return null;
+		}
+	}
+
+	//---- class NonFlashingPopup ---------------------------------------------
+
+	private class NonFlashingPopup
+		extends Popup
+	{
+		private Popup delegate;
+
+		// heavy weight
+		protected Window popupWindow;
+		private Color oldPopupWindowBackground;
+
+		NonFlashingPopup( Popup delegate, Component contents ) {
+			this.delegate = delegate;
+
+			popupWindow = SwingUtilities.windowForComponent( contents );
+			if( popupWindow != null ) {
+				// heavy weight popup
+
+				// fix background flashing which may occur on some platforms
+				// (e.g. macOS and Linux) when using dark theme
+				oldPopupWindowBackground = popupWindow.getBackground();
+				popupWindow.setBackground( contents.getBackground() );
+			}
+		}
+
+		@Override
+		public void show() {
+			if( delegate != null )
+				delegate.show();
+		}
+
+		@Override
+		public void hide() {
+			if( delegate != null ) {
+				delegate.hide();
+				delegate = null;
+			}
+
+			if( popupWindow != null ) {
+				// restore background so that it can not affect other LaFs (when switching)
+				// because popup windows are cached and reused
+				popupWindow.setBackground( oldPopupWindowBackground );
+				popupWindow = null;
+			}
+		}
+	}
+
+	//---- class DropShadowPopup ----------------------------------------------
+
+	private class DropShadowPopup
+		extends NonFlashingPopup
+	{
+		private final Component owner;
+
+		// light weight
+		private JComponent lightComp;
+		private Border oldBorder;
+		private boolean oldOpaque;
+
+		// medium weight
+		private boolean mediumWeightShown;
+		private Panel mediumWeightPanel;
+		private JPanel dropShadowPanel;
+		private ComponentListener mediumPanelListener;
+
+		// heavy weight
+		private Popup dropShadowDelegate;
+		private Window dropShadowWindow;
+		private Color oldDropShadowWindowBackground;
+
+		DropShadowPopup( Popup delegate, Component owner, Component contents ) {
+			super( delegate, contents );
+			this.owner = owner;
+
+			Dimension size = contents.getPreferredSize();
+			if( size.width <= 0 || size.height <= 0 )
+				return;
+
+			if( popupWindow != null ) {
+				// heavy weight popup
+
+				// Since Java has a problem with sub-pixel text rendering on translucent
+				// windows, we can not make the popup window translucent for the drop shadow.
+				// (see https://bugs.openjdk.java.net/browse/JDK-8215980)
+				// The solution is to create a second translucent window that paints
+				// the drop shadow and is positioned behind the popup window.
+
+				// create panel that paints the drop shadow
+				JPanel dropShadowPanel = new JPanel();
+				dropShadowPanel.setBorder( createDropShadowBorder() );
+				dropShadowPanel.setOpaque( false );
+
+				// set preferred size of drop shadow panel
+				Dimension prefSize = popupWindow.getPreferredSize();
+				Insets insets = dropShadowPanel.getInsets();
+				dropShadowPanel.setPreferredSize( new Dimension(
+					prefSize.width + insets.left + insets.right,
+					prefSize.height + insets.top + insets.bottom ) );
+
+				// create heavy weight popup for drop shadow
+				int x = popupWindow.getX() - insets.left;
+				int y = popupWindow.getY() - insets.top;
+				dropShadowDelegate = getHeavyWeightPopup( owner, dropShadowPanel, x, y );
+
+				// make drop shadow popup window translucent
+				dropShadowWindow = SwingUtilities.windowForComponent( dropShadowPanel );
+				if( dropShadowWindow != null ) {
+					oldDropShadowWindowBackground = dropShadowWindow.getBackground();
+					dropShadowWindow.setBackground( new Color( 0, true ) );
+				}
+			} else {
+				mediumWeightPanel = (Panel) SwingUtilities.getAncestorOfClass( Panel.class, contents );
+				if( mediumWeightPanel != null ) {
+					// medium weight popup
+					dropShadowPanel = new JPanel();
+					dropShadowPanel.setBorder( createDropShadowBorder() );
+					dropShadowPanel.setOpaque( false );
+					dropShadowPanel.setSize( FlatUIUtils.addInsets( mediumWeightPanel.getSize(), dropShadowPanel.getInsets() ) );
+				} else {
+					// light weight popup
+					Container p = contents.getParent();
+					if( !(p instanceof JComponent) )
+						return;
+
+					lightComp = (JComponent) p;
+					oldBorder = lightComp.getBorder();
+					oldOpaque = lightComp.isOpaque();
+					lightComp.setBorder( createDropShadowBorder() );
+					lightComp.setOpaque( false );
+					lightComp.setSize( lightComp.getPreferredSize() );
+				}
+			}
+		}
+
+		private Border createDropShadowBorder() {
+			return new FlatDropShadowBorder(
+				UIManager.getColor( "Popup.dropShadowColor" ),
+				UIManager.getInsets( "Popup.dropShadowInsets" ),
+				FlatUIUtils.getUIFloat( "Popup.dropShadowOpacity", 0.5f ) );
+		}
+
+		@Override
+		public void show() {
+			if( dropShadowDelegate != null )
+				dropShadowDelegate.show();
+
+			if( mediumWeightPanel != null )
+				showMediumWeightDropShadow();
+
+			super.show();
+
+			// fix location of light weight popup in case it has left or top drop shadow
+			if( lightComp != null ) {
+				Insets insets = lightComp.getInsets();
+				if( insets.left != 0 || insets.top != 0 )
+					lightComp.setLocation( lightComp.getX() - insets.left, lightComp.getY() - insets.top );
+			}
+		}
+
+		@Override
+		public void hide() {
+			if( dropShadowDelegate != null ) {
+				dropShadowDelegate.hide();
+				dropShadowDelegate = null;
+			}
+
+			if( mediumWeightPanel != null ) {
+				hideMediumWeightDropShadow();
+				dropShadowPanel = null;
+				mediumWeightPanel = null;
+			}
+
+			super.hide();
+
+			if( dropShadowWindow != null ) {
+				dropShadowWindow.setBackground( oldDropShadowWindowBackground );
+				dropShadowWindow = null;
+			}
+
+			if( lightComp != null ) {
+				lightComp.setBorder( oldBorder );
+				lightComp.setOpaque( oldOpaque );
+				lightComp = null;
+			}
+		}
+
+		private void showMediumWeightDropShadow() {
+			if( mediumWeightShown )
+				return;
+
+			mediumWeightShown = true;
+
+			Window window = SwingUtilities.windowForComponent( owner );
+			if( window == null )
+				return;
+
+			if( !(window instanceof RootPaneContainer) )
+				return;
+
+			dropShadowPanel.setVisible( false );
+
+			JLayeredPane layeredPane = ((RootPaneContainer)window).getLayeredPane();
+			layeredPane.add( dropShadowPanel, JLayeredPane.POPUP_LAYER, 0 );
+
+			mediumPanelListener = new ComponentListener() {
+				@Override
+				public void componentShown( ComponentEvent e ) {
+					if( dropShadowPanel != null )
+						dropShadowPanel.setVisible( true );
+				}
+
+				@Override
+				public void componentHidden( ComponentEvent e ) {
+					if( dropShadowPanel != null )
+						dropShadowPanel.setVisible( false );
+				}
+
+				@Override
+				public void componentMoved( ComponentEvent e ) {
+					if( dropShadowPanel != null && mediumWeightPanel != null ) {
+						Point location = mediumWeightPanel.getLocation();
+						Insets insets = dropShadowPanel.getInsets();
+						dropShadowPanel.setLocation( location.x - insets.left, location.y - insets.top );
+					}
+				}
+
+				@Override
+				public void componentResized( ComponentEvent e ) {
+					if( dropShadowPanel != null )
+						dropShadowPanel.setSize( FlatUIUtils.addInsets( mediumWeightPanel.getSize(), dropShadowPanel.getInsets() ) );
+				}
+			};
+			mediumWeightPanel.addComponentListener( mediumPanelListener );
+		}
+
+		private void hideMediumWeightDropShadow() {
+			mediumWeightPanel.removeComponentListener( mediumPanelListener );
+
+			Container parent = dropShadowPanel.getParent();
+			if( parent != null ) {
+				Rectangle bounds = dropShadowPanel.getBounds();
+				parent.remove( dropShadowPanel );
+				parent.repaint( bounds.x, bounds.y, bounds.width, bounds.height );
+			}
+		}
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatPopupMenuBorder.java

@@ -16,7 +16,12 @@
 
 package com.formdev.flatlaf.ui;
 
+import java.awt.Component;
+import java.awt.Container;
+import java.awt.Insets;
+import javax.swing.JScrollPane;
 import javax.swing.UIManager;
+import com.formdev.flatlaf.util.UIScale;
 
 /**
  * Border for {@link javax.swing.JPopupMenu}.
@@ -33,4 +38,18 @@ public class FlatPopupMenuBorder
 		super( UIManager.getInsets( "PopupMenu.borderInsets" ),
 			UIManager.getColor( "PopupMenu.borderColor" ) );
 	}
+
+	@Override
+	public Insets getBorderInsets( Component c, Insets insets ) {
+		if( c instanceof Container &&
+			((Container)c).getComponentCount() > 0 &&
+			((Container)c).getComponent( 0 ) instanceof JScrollPane )
+		{
+			// e.g. for combobox popups
+			insets.left = insets.top = insets.right = insets.bottom = UIScale.scale( 1 );
+			return insets;
+		}
+
+		return super.getBorderInsets( c, insets );
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatPopupMenuSeparatorUI.java

@@ -22,6 +22,17 @@ import javax.swing.plaf.ComponentUI;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JPopupMenu.Separator}.
  *
+ * <!-- BasicSeparatorUI -->
+ *
+ * @uiDefault PopupMenuSeparator.background		Color	unused
+ * @uiDefault PopupMenuSeparator.foreground		Color
+ *
+ * <!-- FlatSeparatorUI -->
+ *
+ * @uiDefault PopupMenuSeparator.height			int		height (or width) of the component; may be larger than stripe
+ * @uiDefault PopupMenuSeparator.stripeWidth	int		width of the stripe
+ * @uiDefault PopupMenuSeparator.stripeIndent	int		indent of stripe from top (or left); allows positioning of stripe within component
+ *
  * @author Karl Tauber
  */
 public class FlatPopupMenuSeparatorUI

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatPopupMenuUI.java

@@ -23,6 +23,13 @@ import javax.swing.plaf.basic.BasicPopupMenuUI;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JPopupMenu}.
  *
+ * <!-- BasicPopupMenuUI -->
+ *
+ * @uiDefault PopupMenu.font							Font
+ * @uiDefault PopupMenu.background						Color
+ * @uiDefault PopupMenu.foreground						Color
+ * @uiDefault PopupMenu.border							Border
+ *
  * @author Karl Tauber
  */
 public class FlatPopupMenuUI

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatProgressBarUI.java

@@ -16,14 +16,19 @@
 
 package com.formdev.flatlaf.ui;
 
+import static com.formdev.flatlaf.FlatClientProperties.*;
 import java.awt.Dimension;
+import java.awt.FontMetrics;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.Insets;
+import java.awt.geom.Area;
 import java.awt.geom.RoundRectangle2D;
+import java.beans.PropertyChangeListener;
 import javax.swing.JComponent;
 import javax.swing.JProgressBar;
 import javax.swing.LookAndFeel;
+import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicProgressBarUI;
 import com.formdev.flatlaf.util.UIScale;
@@ -31,11 +36,34 @@ import com.formdev.flatlaf.util.UIScale;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JProgressBar}.
  *
+ * <!-- BasicProgressBarUI -->
+ *
+ * @uiDefault ProgressBar.font						Font
+ * @uiDefault ProgressBar.background				Color
+ * @uiDefault ProgressBar.foreground				Color
+ * @uiDefault ProgressBar.selectionBackground		Color
+ * @uiDefault ProgressBar.selectionForeground		Color
+ * @uiDefault ProgressBar.border					Border
+ * @uiDefault ProgressBar.horizontalSize			Dimension	default is 146,12
+ * @uiDefault ProgressBar.verticalSize				Dimension	default is 12,146
+ * @uiDefault ProgressBar.repaintInterval			int		default is 50 milliseconds
+ * @uiDefault ProgressBar.cycleTime					int		default is 3000 milliseconds
+ *
+ * <!-- FlatProgressBarUI -->
+ *
+ * @uiDefault ProgressBar.arc						int
+ *
  * @author Karl Tauber
  */
 public class FlatProgressBarUI
 	extends BasicProgressBarUI
 {
+	protected int arc;
+	protected Dimension horizontalSize;
+	protected Dimension verticalSize;
+
+	private PropertyChangeListener propertyChangeListener;
+
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatProgressBarUI();
 	}
@@ -45,16 +73,61 @@ public class FlatProgressBarUI
 		super.installDefaults();
 
 		LookAndFeel.installProperty( progressBar, "opaque", false );
+
+		arc = UIManager.getInt( "ProgressBar.arc" );
+		horizontalSize = UIManager.getDimension( "ProgressBar.horizontalSize" );
+		verticalSize = UIManager.getDimension( "ProgressBar.verticalSize" );
+	}
+
+	@Override
+	protected void installListeners() {
+		super.installListeners();
+
+		propertyChangeListener = e -> {
+			switch( e.getPropertyName() ) {
+				case PROGRESS_BAR_LARGE_HEIGHT:
+				case PROGRESS_BAR_SQUARE:
+					progressBar.revalidate();
+					progressBar.repaint();
+					break;
+			}
+		};
+		progressBar.addPropertyChangeListener( propertyChangeListener );
+	}
+
+	@Override
+	protected void uninstallListeners() {
+		super.uninstallListeners();
+
+		progressBar.removePropertyChangeListener( propertyChangeListener );
+		propertyChangeListener = null;
+	}
+
+	@Override
+	public Dimension getPreferredSize( JComponent c ) {
+		Dimension size = super.getPreferredSize( c );
+
+		if( progressBar.isStringPainted() || clientPropertyBoolean( c, PROGRESS_BAR_LARGE_HEIGHT, false ) ) {
+			// recalculate progress height/width to make it smaller
+			Insets insets = progressBar.getInsets();
+			FontMetrics fm = progressBar.getFontMetrics( progressBar.getFont() );
+			if( progressBar.getOrientation() == JProgressBar.HORIZONTAL )
+				size.height = Math.max( fm.getHeight() + insets.top + insets.bottom, getPreferredInnerHorizontal().height );
+			else
+				size.width = Math.max( fm.getHeight() + insets.left + insets.right, getPreferredInnerVertical().width );
+		}
+
+		return size;
 	}
 
 	@Override
 	protected Dimension getPreferredInnerHorizontal() {
-		return UIScale.scale( super.getPreferredInnerHorizontal() );
+		return UIScale.scale( horizontalSize );
 	}
 
 	@Override
 	protected Dimension getPreferredInnerVertical() {
-		return UIScale.scale( super.getPreferredInnerVertical() );
+		return UIScale.scale( verticalSize );
 	}
 
 	@Override
@@ -77,13 +150,16 @@ public class FlatProgressBarUI
 			return;
 
 		boolean horizontal = (progressBar.getOrientation() == JProgressBar.HORIZONTAL);
-		int arc = horizontal ? height : width;
+		int arc = clientPropertyBoolean( c, PROGRESS_BAR_SQUARE, false )
+			? 0
+			: Math.min( UIScale.scale( this.arc ), horizontal ? height : width );
 
 		FlatUIUtils.setRenderingHints( (Graphics2D) g );
 
 		// paint track
+		RoundRectangle2D.Float trackShape = new RoundRectangle2D.Float( x, y, width, height, arc, arc );
 		g.setColor( progressBar.getBackground() );
-		((Graphics2D)g).fill( new RoundRectangle2D.Float( x, y, width, height, arc, arc ) );
+		((Graphics2D)g).fill( trackShape );
 
 		// paint progress
 		if( progressBar.isIndeterminate() ) {
@@ -99,14 +175,37 @@ public class FlatProgressBarUI
 		} else {
 			int amountFull = getAmountFull( insets, width, height );
 
-			g.setColor( progressBar.getForeground() );
-			((Graphics2D)g).fill( horizontal
+			RoundRectangle2D.Float progressShape = horizontal
 				? new RoundRectangle2D.Float( c.getComponentOrientation().isLeftToRight() ? x : x + (width - amountFull),
 					y, amountFull, height, arc, arc )
-				: new RoundRectangle2D.Float( x, y + (height - amountFull), width, amountFull, arc, arc ) );
+				: new RoundRectangle2D.Float( x, y + (height - amountFull), width, amountFull, arc, arc );
+
+			g.setColor( progressBar.getForeground() );
+			if( amountFull < (horizontal ? height : width) ) {
+				// special painting for low amounts to avoid painting outside of track
+				Area area = new Area( trackShape );
+				area.intersect( new Area( progressShape ) );
+				((Graphics2D)g).fill( area );
+			} else
+				((Graphics2D)g).fill( progressShape );
 
 			if( progressBar.isStringPainted() )
 				paintString( g, x, y, width, height, amountFull, insets );
 		}
 	}
+
+	@Override
+	protected void setAnimationIndex( int newValue ) {
+		super.setAnimationIndex( newValue );
+
+		// On HiDPI screens at 125%, 150% and 175% scaling, it occurs that antialiased painting
+		// may paint one pixel outside of the clipping area. This results in visual artifacts
+		// in indeterminate mode when the progress moves around.
+		// Unfortunately it is not safe to invoke getBox() from here (may throw NPE),
+		// which makes it impractical to get progress box and repaint increased box.
+		// Only solution is to repaint whole progress bar.
+		double systemScaleFactor = UIScale.getSystemScaleFactor( progressBar.getGraphicsConfiguration() );
+		if( (int) systemScaleFactor != systemScaleFactor )
+			progressBar.repaint();
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatRadioButtonMenuItemUI.java

@@ -16,20 +16,47 @@
 
 package com.formdev.flatlaf.ui;
 
-import static com.formdev.flatlaf.util.UIScale.scale;
-import java.beans.PropertyChangeListener;
+import java.awt.Dimension;
+import java.awt.Graphics;
+import javax.swing.Icon;
 import javax.swing.JComponent;
+import javax.swing.LookAndFeel;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicRadioButtonMenuItemUI;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JRadioButtonMenuItem}.
  *
+ * <!-- BasicRadioButtonMenuItemUI -->
+ *
+ * @uiDefault RadioButtonMenuItem.font								Font
+ * @uiDefault RadioButtonMenuItem.background						Color
+ * @uiDefault RadioButtonMenuItem.foreground						Color
+ * @uiDefault RadioButtonMenuItem.disabledForeground				Color
+ * @uiDefault RadioButtonMenuItem.selectionBackground				Color
+ * @uiDefault RadioButtonMenuItem.selectionForeground				Color
+ * @uiDefault RadioButtonMenuItem.acceleratorForeground				Color
+ * @uiDefault RadioButtonMenuItem.acceleratorSelectionForeground	Color
+ * @uiDefault MenuItem.acceleratorFont								Font		defaults to MenuItem.font
+ * @uiDefault MenuItem.acceleratorDelimiter							String
+ * @uiDefault RadioButtonMenuItem.border							Border
+ * @uiDefault RadioButtonMenuItem.borderPainted						boolean
+ * @uiDefault RadioButtonMenuItem.margin							Insets
+ * @uiDefault RadioButtonMenuItem.arrowIcon							Icon
+ * @uiDefault RadioButtonMenuItem.checkIcon							Icon
+ * @uiDefault RadioButtonMenuItem.opaque							boolean
+ *
+ * <!-- FlatRadioButtonMenuItemUI -->
+ *
+ * @uiDefault MenuItem.iconTextGap									int
+ *
  * @author Karl Tauber
  */
 public class FlatRadioButtonMenuItemUI
 	extends BasicRadioButtonMenuItemUI
 {
+	private FlatMenuItemRenderer renderer;
+
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatRadioButtonMenuItemUI();
 	}
@@ -38,20 +65,30 @@ public class FlatRadioButtonMenuItemUI
 	protected void installDefaults() {
 		super.installDefaults();
 
-		// scale
-		defaultTextIconGap = scale( defaultTextIconGap );
+		LookAndFeel.installProperty( menuItem, "iconTextGap", FlatUIUtils.getUIInt( "MenuItem.iconTextGap", 4 ) );
+
+		renderer = createRenderer();
 	}
 
-	/**
-	 * Scale defaultTextIconGap again if iconTextGap property has changed.
-	 */
 	@Override
-	protected PropertyChangeListener createPropertyChangeListener( JComponent c ) {
-		PropertyChangeListener superListener = super.createPropertyChangeListener( c );
-		return e -> {
-			superListener.propertyChange( e );
-			if( e.getPropertyName() == "iconTextGap" )
-				defaultTextIconGap = scale( defaultTextIconGap );
-		};
+	protected void uninstallDefaults() {
+		super.uninstallDefaults();
+
+		renderer = null;
+	}
+
+	protected FlatMenuItemRenderer createRenderer() {
+		return new FlatMenuItemRenderer( menuItem, checkIcon, arrowIcon, acceleratorFont, acceleratorDelimiter );
+	}
+
+	@Override
+	protected Dimension getPreferredMenuItemSize( JComponent c, Icon checkIcon, Icon arrowIcon, int defaultTextIconGap ) {
+		return renderer.getPreferredMenuItemSize();
+	}
+
+	@Override
+	public void paint( Graphics g, JComponent c ) {
+		renderer.paintMenuItem( g, selectionBackground, selectionForeground, disabledForeground,
+			acceleratorForeground, acceleratorSelectionForeground );
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatRadioButtonUI.java

@@ -18,22 +18,37 @@ package com.formdev.flatlaf.ui;
 
 import static com.formdev.flatlaf.util.UIScale.scale;
 import java.awt.Color;
+import java.awt.Dimension;
 import java.awt.Graphics;
+import java.awt.Insets;
 import java.awt.Rectangle;
 import javax.swing.AbstractButton;
 import javax.swing.JComponent;
 import javax.swing.LookAndFeel;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicRadioButtonUI;
+import com.formdev.flatlaf.icons.FlatCheckBoxIcon;
+import com.formdev.flatlaf.util.UIScale;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JRadioButton}.
  *
- * TODO document used UI defaults of superclass
+ * <!-- BasicRadioButtonUI -->
  *
- * @uiDefault Button.iconTextGap				int
- * @uiDefault Button.disabledText				Color
+ * @uiDefault RadioButton.font						Font
+ * @uiDefault RadioButton.background				Color
+ * @uiDefault RadioButton.foreground				Color
+ * @uiDefault RadioButton.border					Border
+ * @uiDefault RadioButton.margin					Insets
+ * @uiDefault RadioButton.rollover					boolean
+ * @uiDefault RadioButton.icon						Icon
+ *
+ * <!-- FlatRadioButtonUI -->
+ *
+ * @uiDefault RadioButton.iconTextGap				int
+ * @uiDefault RadioButton.disabledText				Color
  *
  * @author Karl Tauber
  */
@@ -80,8 +95,76 @@ public class FlatRadioButtonUI
 		defaults_initialized = false;
 	}
 
+	private static Insets tempInsets = new Insets( 0, 0, 0, 0 );
+
+	@Override
+	public Dimension getPreferredSize( JComponent c ) {
+		Dimension size = super.getPreferredSize( c );
+		if( size == null )
+			return null;
+
+		// small insets fix
+		int focusWidth = getIconFocusWidth( c );
+		if( focusWidth > 0 ) {
+			// Increase preferred width and height if insets were explicitly reduced (e.g. with
+			// an EmptyBorder) and icon has a focus width, which is not included in icon size.
+			// Otherwise the component may be too small and outer focus border may be cut off.
+			Insets insets = c.getInsets( tempInsets );
+			size.width += Math.max( focusWidth - insets.left, 0 ) + Math.max( focusWidth - insets.right, 0 );
+			size.height += Math.max( focusWidth - insets.top, 0 ) + Math.max( focusWidth - insets.bottom, 0 );
+		}
+
+		return size;
+	}
+
+	@Override
+	public void paint( Graphics g, JComponent c ) {
+		// fill background even if not opaque if
+		// - contentAreaFilled is true and
+		// - if background was explicitly set to a non-UIResource color
+		if( !c.isOpaque() &&
+			((AbstractButton)c).isContentAreaFilled() &&
+			!(c.getBackground() instanceof UIResource) )
+		{
+			g.setColor( c.getBackground() );
+			g.fillRect( 0, 0, c.getWidth(), c.getHeight() );
+		}
+
+		// small insets fix
+		int focusWidth = getIconFocusWidth( c );
+		if( focusWidth > 0 ) {
+			boolean ltr = c.getComponentOrientation().isLeftToRight();
+			Insets insets = c.getInsets( tempInsets );
+			int leftOrRightInset = ltr ? insets.left : insets.right;
+			if( focusWidth > leftOrRightInset ) {
+				// The left (or right) inset is smaller than the focus width, which may be
+				// the case if insets were explicitly reduced (e.g. with an EmptyBorder).
+				// In this case the width has been increased in getPreferredSize() and
+				// here it is necessary to fix icon and text painting location.
+				int offset = focusWidth - leftOrRightInset;
+				if( !ltr )
+					offset = -offset;
+
+				// move the graphics origin to the left (or right)
+				g.translate( offset, 0 );
+				super.paint( g, c );
+				g.translate( -offset, 0 );
+				return;
+			}
+		}
+
+		super.paint( g, c );
+	}
+
 	@Override
 	protected void paintText( Graphics g, AbstractButton b, Rectangle textRect, String text ) {
 		FlatButtonUI.paintText( g, b, textRect, text, b.isEnabled() ? b.getForeground() : disabledText );
 	}
+
+	private int getIconFocusWidth( JComponent c ) {
+		AbstractButton b = (AbstractButton) c;
+		return (b.getIcon() == null && getDefaultIcon() instanceof FlatCheckBoxIcon)
+			? UIScale.scale( ((FlatCheckBoxIcon)getDefaultIcon()).focusWidth )
+			: 0;
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatRootPaneUI.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright 2020 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.ui;
+
+import java.awt.Color;
+import java.awt.Container;
+import javax.swing.JComponent;
+import javax.swing.JDialog;
+import javax.swing.JFrame;
+import javax.swing.JRootPane;
+import javax.swing.UIManager;
+import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.UIResource;
+import javax.swing.plaf.basic.BasicRootPaneUI;
+
+/**
+ * Provides the Flat LaF UI delegate for {@link javax.swing.JRootPane}.
+ *
+ * @author Karl Tauber
+ */
+public class FlatRootPaneUI
+	extends BasicRootPaneUI
+{
+	private static ComponentUI instance;
+
+	public static ComponentUI createUI( JComponent c ) {
+		if( instance == null )
+			instance = new FlatRootPaneUI();
+		return instance;
+	}
+
+	@Override
+	protected void installDefaults( JRootPane c ) {
+		super.installDefaults( c );
+
+		// Update background color of JFrame or JDialog parent to avoid bad border
+		// on HiDPI screens when switching from light to dark Laf.
+		// The background of JFrame is initialized in JFrame.frameInit() and
+		// the background of JDialog in JDialog.dialogInit(),
+		// but it was not updated when switching Laf.
+		Container parent = c.getParent();
+		if( parent instanceof JFrame || parent instanceof JDialog ) {
+			Color background = parent.getBackground();
+			if( background == null || background instanceof UIResource )
+				parent.setBackground( UIManager.getColor( "control" ) );
+		}
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatRoundBorder.java

@@ -16,7 +16,7 @@
 
 package com.formdev.flatlaf.ui;
 
-import static com.formdev.flatlaf.util.UIScale.scale;
+import java.awt.Component;
 import javax.swing.UIManager;
 
 /**
@@ -32,7 +32,7 @@ public class FlatRoundBorder
 	protected final int arc = UIManager.getInt( "Component.arc" );
 
 	@Override
-	protected float getArc() {
-		return scale( (float) arc );
+	protected int getArc( Component c ) {
+		return FlatUIUtils.isRoundRect( c ) ? Short.MAX_VALUE : arc;
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatScrollBarUI.java

@@ -19,41 +19,75 @@ package com.formdev.flatlaf.ui;
 import java.awt.Color;
 import java.awt.Dimension;
 import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.Insets;
 import java.awt.Rectangle;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
+import java.beans.PropertyChangeEvent;
+import java.beans.PropertyChangeListener;
+import java.util.Objects;
+import javax.swing.InputMap;
 import javax.swing.JButton;
 import javax.swing.JComponent;
+import javax.swing.JScrollBar;
+import javax.swing.JScrollPane;
+import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicScrollBarUI;
+import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.util.UIScale;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JScrollBar}.
  *
+ * <!-- BasicScrollBarUI -->
+ *
  * @uiDefault ScrollBar.background			Color
  * @uiDefault ScrollBar.foreground			Color
  * @uiDefault ScrollBar.track				Color
  * @uiDefault ScrollBar.thumb				Color
- * @uiDefault ScrollBar.hoverTrackColor		Color
- * @uiDefault ScrollBar.hoverThumbColor		Color
  * @uiDefault ScrollBar.width				int
- * @uiDefault ScrollBar.minimumThumbSize	Insets
- * @uiDefault ScrollBar.maximumThumbSize	Insets
+ * @uiDefault ScrollBar.minimumThumbSize	Dimension
+ * @uiDefault ScrollBar.maximumThumbSize	Dimension
  * @uiDefault ScrollBar.allowsAbsolutePositioning	boolean
  *
+ * <!-- FlatScrollBarUI -->
+ *
+ * @uiDefault ScrollBar.trackInsets					Insets
+ * @uiDefault ScrollBar.thumbInsets					Insets
+ * @uiDefault ScrollBar.trackArc					int
+ * @uiDefault ScrollBar.thumbArc					int
+ * @uiDefault ScrollBar.hoverTrackColor				Color
+ * @uiDefault ScrollBar.hoverThumbColor				Color
+ * @uiDefault ScrollBar.hoverThumbWithTrack			boolean
+ * @uiDefault Component.arrowType					String	triangle (default) or chevron
+ * @uiDefault ScrollBar.showButtons					boolean
+ * @uiDefault ScrollBar.buttonArrowColor			Color
+ * @uiDefault ScrollBar.buttonDisabledArrowColor	Color
+ *
  * @author Karl Tauber
  */
 public class FlatScrollBarUI
 	extends BasicScrollBarUI
 {
+	protected Insets trackInsets;
+	protected Insets thumbInsets;
+	protected int trackArc;
+	protected int thumbArc;
 	protected Color hoverTrackColor;
 	protected Color hoverThumbColor;
+	protected boolean hoverThumbWithTrack;
+
+	protected boolean showButtons;
+	protected String arrowType;
+	protected Color buttonArrowColor;
+	protected Color buttonDisabledArrowColor;
 
 	private MouseAdapter hoverListener;
-	private boolean hoverTrack;
-	private boolean hoverThumb;
+	protected boolean hoverTrack;
+	protected boolean hoverThumb;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatScrollBarUI();
@@ -81,16 +115,61 @@ public class FlatScrollBarUI
 	protected void installDefaults() {
 		super.installDefaults();
 
+		trackInsets = UIManager.getInsets( "ScrollBar.trackInsets" );
+		thumbInsets = UIManager.getInsets( "ScrollBar.thumbInsets" );
+		trackArc = UIManager.getInt( "ScrollBar.trackArc" );
+		thumbArc = UIManager.getInt( "ScrollBar.thumbArc" );
 		hoverTrackColor = UIManager.getColor( "ScrollBar.hoverTrackColor" );
 		hoverThumbColor = UIManager.getColor( "ScrollBar.hoverThumbColor" );
+		hoverThumbWithTrack = UIManager.getBoolean( "ScrollBar.hoverThumbWithTrack" );
+
+		showButtons = UIManager.getBoolean( "ScrollBar.showButtons" );
+		arrowType = UIManager.getString( "Component.arrowType" );
+		buttonArrowColor = UIManager.getColor( "ScrollBar.buttonArrowColor" );
+		buttonDisabledArrowColor = UIManager.getColor( "ScrollBar.buttonDisabledArrowColor" );
 	}
 
 	@Override
 	protected void uninstallDefaults() {
 		super.uninstallDefaults();
 
+		trackInsets = null;
+		thumbInsets = null;
 		hoverTrackColor = null;
 		hoverThumbColor = null;
+
+		buttonArrowColor = null;
+		buttonDisabledArrowColor = null;
+	}
+
+	@Override
+	protected PropertyChangeListener createPropertyChangeListener() {
+		return new BasicScrollBarUI.PropertyChangeHandler() {
+			@Override
+			public void propertyChange( PropertyChangeEvent e ) {
+				super.propertyChange( e );
+
+				switch( e.getPropertyName() ) {
+					case FlatClientProperties.SCROLL_BAR_SHOW_BUTTONS:
+						scrollbar.revalidate();
+						scrollbar.repaint();
+						break;
+
+					case "componentOrientation":
+						// this is missing in BasicScrollBarUI.Handler.propertyChange()
+						InputMap inputMap = (InputMap) UIManager.get( "ScrollBar.ancestorInputMap" );
+						if( !scrollbar.getComponentOrientation().isLeftToRight() ) {
+							InputMap rtlInputMap = (InputMap) UIManager.get( "ScrollBar.ancestorInputMap.RightToLeft" );
+							if( rtlInputMap != null ) {
+								rtlInputMap.setParent( inputMap );
+								inputMap = rtlInputMap;
+							}
+						}
+						SwingUtilities.replaceUIInputMap( scrollbar, JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, inputMap );
+						break;
+				}
+			}
+		};
 	}
 
 	@Override
@@ -100,24 +179,94 @@ public class FlatScrollBarUI
 
 	@Override
 	protected JButton createDecreaseButton( int orientation ) {
-		return createInvisibleButton();
+		return createArrowButton( orientation );
 	}
 
 	@Override
 	protected JButton createIncreaseButton( int orientation ) {
-		return createInvisibleButton();
+		return createArrowButton( orientation );
 	}
 
-	private JButton createInvisibleButton() {
-		JButton button = new JButton();
-		button.setMinimumSize( new Dimension() );
-		button.setMaximumSize( new Dimension() );
-		button.setPreferredSize( new Dimension() );
+	private JButton createArrowButton( int orientation ) {
+		FlatArrowButton button = new FlatArrowButton( orientation,
+			arrowType, buttonArrowColor, buttonDisabledArrowColor, null, hoverTrackColor )
+		{
+			@Override
+			protected Color deriveHoverBackground( Color hoverBackground ) {
+				return getTrackColor( scrollbar, true ) ;
+			}
+
+			@Override
+			public Dimension getPreferredSize() {
+				if( isShowButtons() ) {
+					int w = UIScale.scale( scrollBarWidth );
+					return new Dimension( w, w );
+				} else
+					return new Dimension();
+			}
+
+			@Override
+			public Dimension getMinimumSize() {
+				return isShowButtons() ? super.getMinimumSize() : new Dimension();
+			}
+
+			@Override
+			public Dimension getMaximumSize() {
+				return isShowButtons() ? super.getMaximumSize() : new Dimension();
+			}
+		};
+		button.setArrowWidth( FlatArrowButton.DEFAULT_ARROW_WIDTH - 2 );
 		button.setFocusable( false );
 		button.setRequestFocusEnabled( false );
 		return button;
 	}
 
+	private boolean isShowButtons() {
+		Object showButtons = scrollbar.getClientProperty( FlatClientProperties.SCROLL_BAR_SHOW_BUTTONS );
+		if( showButtons == null && scrollbar.getParent() instanceof JScrollPane )
+			showButtons = ((JScrollPane)scrollbar.getParent()).getClientProperty( FlatClientProperties.SCROLL_BAR_SHOW_BUTTONS );
+		return (showButtons != null) ? Objects.equals( showButtons, true ) : this.showButtons;
+	}
+
+	@Override
+	public void paint( Graphics g, JComponent c ) {
+		FlatUIUtils.setRenderingHints( (Graphics2D) g );
+		super.paint( g, c );
+	}
+
+	@Override
+	protected void paintTrack( Graphics g, JComponent c, Rectangle trackBounds ) {
+		g.setColor( getTrackColor( c, hoverTrack ) );
+		paintTrackOrThumb( g, c, trackBounds, trackInsets, trackArc );
+	}
+
+	@Override
+	protected void paintThumb( Graphics g, JComponent c, Rectangle thumbBounds ) {
+		if( thumbBounds.isEmpty() || !scrollbar.isEnabled() )
+			return;
+
+		g.setColor( getThumbColor( c, hoverThumb ) );
+		paintTrackOrThumb( g, c, thumbBounds, thumbInsets, thumbArc );
+	}
+
+	protected void paintTrackOrThumb( Graphics g, JComponent c, Rectangle bounds, Insets insets, int arc ) {
+		// rotate insets for horizontal orientation because they are given for vertical orientation
+		if( scrollbar.getOrientation() == JScrollBar.HORIZONTAL )
+			insets = new Insets( insets.right, insets.top, insets.left, insets.bottom );
+
+		// subtract insets from bounds
+		bounds = FlatUIUtils.subtractInsets( bounds, UIScale.scale( insets ) );
+
+		if( arc <= 0 ) {
+			// paint rectangle
+			g.fillRect( bounds.x, bounds.y, bounds.width, bounds.height );
+		} else {
+			// paint round rectangle
+			arc = Math.min( UIScale.scale( arc ), Math.min( bounds.width, bounds.height ) );
+			g.fillRoundRect( bounds.x, bounds.y, bounds.width, bounds.height, arc, arc );
+		}
+	}
+
 	@Override
 	protected void paintDecreaseHighlight( Graphics g ) {
 		// do not paint
@@ -128,19 +277,15 @@ public class FlatScrollBarUI
 		// do not paint
 	}
 
-	@Override
-	protected void paintTrack( Graphics g, JComponent c, Rectangle trackBounds ) {
-		g.setColor( hoverTrack ? hoverTrackColor : trackColor );
-		g.fillRect( trackBounds.x, trackBounds.y, trackBounds.width, trackBounds.height );
+	protected Color getTrackColor( JComponent c, boolean hover ) {
+		Color trackColor = FlatUIUtils.deriveColor( this.trackColor, c.getBackground() );
+		return hover ? FlatUIUtils.deriveColor( hoverTrackColor, trackColor ) : trackColor;
 	}
 
-	@Override
-	protected void paintThumb( Graphics g, JComponent c, Rectangle thumbBounds ) {
-		if( thumbBounds.isEmpty() || !scrollbar.isEnabled() )
-			return;
-
-		g.setColor( hoverThumb ? hoverThumbColor : thumbColor );
-		g.fillRect( thumbBounds.x, thumbBounds.y, thumbBounds.width, thumbBounds.height );
+	protected Color getThumbColor( JComponent c, boolean hover ) {
+		Color trackColor = FlatUIUtils.deriveColor( this.trackColor, c.getBackground() );
+		Color thumbColor = FlatUIUtils.deriveColor( this.thumbColor, trackColor );
+		return hover ? FlatUIUtils.deriveColor( hoverThumbColor, thumbColor ) : thumbColor;
 	}
 
 	@Override
@@ -191,7 +336,7 @@ public class FlatScrollBarUI
 			boolean inThumb = getThumbBounds().contains( x, y );
 			if( inTrack != hoverTrack || inThumb != hoverThumb ) {
 				hoverTrack = inTrack;
-				hoverThumb = inThumb;
+				hoverThumb = inThumb || (hoverThumbWithTrack && inTrack);
 				repaint();
 			}
 		}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatScrollPaneUI.java

@@ -14,27 +14,57 @@
  * limitations under the License.
  */
 
+/*
+ * Smooth scrolling code partly based on code from IntelliJ IDEA Community Edition,
+ * which is licensed under the Apache 2.0 license. Copyright 2000-2016 JetBrains s.r.o.
+ * See: https://github.com/JetBrains/intellij-community/blob/31e1b5a8e43219b9571951bab6457cfb3012e3ef/platform/platform-api/src/com/intellij/ui/components/SmoothScrollPane.java#L141-L185
+ *
+ */
 package com.formdev.flatlaf.ui;
 
 import java.awt.Component;
 import java.awt.Graphics;
 import java.awt.Insets;
+import java.awt.Rectangle;
 import java.awt.event.ContainerEvent;
 import java.awt.event.ContainerListener;
 import java.awt.event.FocusEvent;
 import java.awt.event.FocusListener;
+import java.awt.event.MouseWheelEvent;
+import java.awt.event.MouseWheelListener;
 import java.beans.PropertyChangeEvent;
+import java.beans.PropertyChangeListener;
+import javax.swing.BorderFactory;
+import javax.swing.JButton;
 import javax.swing.JComponent;
+import javax.swing.JScrollBar;
 import javax.swing.JScrollPane;
+import javax.swing.JTable;
 import javax.swing.JViewport;
 import javax.swing.LookAndFeel;
+import javax.swing.ScrollPaneConstants;
+import javax.swing.Scrollable;
+import javax.swing.SwingConstants;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicScrollPaneUI;
+import com.formdev.flatlaf.FlatClientProperties;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JScrollPane}.
  *
+ * <!-- BasicScrollPaneUI -->
+ *
+ * @uiDefault ScrollPane.font				Font	unused
+ * @uiDefault ScrollPane.background			Color
+ * @uiDefault ScrollPane.foreground			Color	unused
+ * @uiDefault ScrollPane.border				Border
+ * @uiDefault ScrollPane.viewportBorder		Border
+ *
+ * <!-- FlatScrollPaneUI -->
+ *
+ * @uiDefault ScrollPane.smoothScrolling		boolean
+ *
  * @author Karl Tauber
  */
 public class FlatScrollPaneUI
@@ -53,7 +83,7 @@ public class FlatScrollPaneUI
 		int focusWidth = UIManager.getInt( "Component.focusWidth" );
 		LookAndFeel.installProperty( c, "opaque", focusWidth == 0 );
 
-		MigLayoutVisualPadding.install( scrollpane, focusWidth );
+		MigLayoutVisualPadding.install( scrollpane );
 	}
 
 	@Override
@@ -79,7 +109,172 @@ public class FlatScrollPaneUI
 		handler = null;
 	}
 
-	public Handler getHandler() {
+	@Override
+	protected MouseWheelListener createMouseWheelListener() {
+		return new BasicScrollPaneUI.MouseWheelHandler() {
+			@Override
+			public void mouseWheelMoved( MouseWheelEvent e ) {
+				// Note: Getting UI value "ScrollPane.smoothScrolling" here to allow
+				// applications to turn smooth scrolling on or off at any time
+				// (e.g. in application options dialog).
+				if( UIManager.getBoolean( "ScrollPane.smoothScrolling" ) &&
+					scrollpane.isWheelScrollingEnabled() &&
+					e.getScrollType() == MouseWheelEvent.WHEEL_UNIT_SCROLL &&
+					e.getPreciseWheelRotation() != 0 &&
+					e.getPreciseWheelRotation() != e.getWheelRotation() )
+				{
+					mouseWheelMovedSmooth( e );
+				} else
+					super.mouseWheelMoved( e );
+			}
+		};
+	}
+
+	private static final double EPSILON = 1e-5d;
+
+	private void mouseWheelMovedSmooth( MouseWheelEvent e ) {
+		// return if there is no viewport
+		JViewport viewport = scrollpane.getViewport();
+		if( viewport == null )
+			return;
+
+		// find scrollbar to scroll
+		JScrollBar scrollbar = scrollpane.getVerticalScrollBar();
+		if( scrollbar == null || !scrollbar.isVisible() || e.isShiftDown() ) {
+			scrollbar = scrollpane.getHorizontalScrollBar();
+			if( scrollbar == null || !scrollbar.isVisible() )
+				return;
+		}
+
+		// consume event
+		e.consume();
+
+		// get precise wheel rotation
+		double rotation = e.getPreciseWheelRotation();
+
+		// get unit and block increment
+		int unitIncrement;
+		int blockIncrement;
+		int orientation = scrollbar.getOrientation();
+		Component view = viewport.getView();
+		if( view instanceof Scrollable ) {
+			Scrollable scrollable = (Scrollable) view;
+
+			// Use (0, 0) view position to obtain constant unit increment of first item
+			// (which might otherwise be variable on smaller-than-unit scrolling).
+			Rectangle visibleRect = new Rectangle( viewport.getViewSize() );
+			unitIncrement = scrollable.getScrollableUnitIncrement( visibleRect, orientation, 1 );
+			blockIncrement = scrollable.getScrollableBlockIncrement( visibleRect, orientation, 1 );
+
+			if( unitIncrement > 0 ) {
+				// For the case that the first item (e.g. in a list) is larger
+				// than the other items, get the unit increment of the second item
+				// and use the smaller one.
+				if( orientation == SwingConstants.VERTICAL ) {
+					visibleRect.y += unitIncrement;
+					visibleRect.height -= unitIncrement;
+				} else {
+					visibleRect.x += unitIncrement;
+					visibleRect.width -= unitIncrement;
+				}
+				int unitIncrement2 = scrollable.getScrollableUnitIncrement( visibleRect, orientation, 1 );
+				if( unitIncrement2 > 0 )
+					unitIncrement = Math.min( unitIncrement, unitIncrement2 );
+			}
+		} else {
+			int direction = rotation < 0 ? -1 : 1;
+			unitIncrement = scrollbar.getUnitIncrement( direction );
+			blockIncrement = scrollbar.getBlockIncrement( direction );
+		}
+
+		// limit scroll amount (number of units to scroll) for small viewports
+		// (e.g. vertical scrolling in file chooser)
+		int scrollAmount = e.getScrollAmount();
+		int viewportWH = (orientation == SwingConstants.VERTICAL)
+			? viewport.getHeight()
+			: viewport.getWidth();
+		if( unitIncrement * scrollAmount > viewportWH )
+			scrollAmount = Math.max( viewportWH / unitIncrement, 1 );
+
+		// compute relative delta
+		double delta = rotation * scrollAmount * unitIncrement;
+		boolean adjustDelta = Math.abs( rotation ) < (1.0 + EPSILON);
+		double adjustedDelta = adjustDelta
+			? Math.max( -blockIncrement, Math.min( delta, blockIncrement ) )
+			: delta;
+
+		// compute new value
+		int value = scrollbar.getValue();
+		double minDelta = scrollbar.getMinimum() - value;
+		double maxDelta = scrollbar.getMaximum() - scrollbar.getModel().getExtent() - value;
+		double boundedDelta = Math.max( minDelta, Math.min( adjustedDelta, maxDelta ) );
+		int newValue = value + (int) Math.round( boundedDelta );
+
+		// set new value
+		if( newValue != value )
+			scrollbar.setValue( newValue );
+
+/*debug
+		System.out.println( String.format( "%4d  %9f / %4d %4d / %12f %5s %12f / %4d %4d %4d / %12f %12f %12f / %4d",
+			e.getWheelRotation(),
+			e.getPreciseWheelRotation(),
+			unitIncrement,
+			blockIncrement,
+			delta,
+			adjustDelta,
+			adjustedDelta,
+			value,
+			scrollbar.getMinimum(),
+			scrollbar.getMaximum(),
+			minDelta,
+			maxDelta,
+			boundedDelta,
+			newValue ) );
+*/
+	}
+
+	@Override
+	protected PropertyChangeListener createPropertyChangeListener() {
+		return new BasicScrollPaneUI.PropertyChangeHandler() {
+			@Override
+			public void propertyChange( PropertyChangeEvent e ) {
+				super.propertyChange( e );
+
+				switch( e.getPropertyName() ) {
+					case FlatClientProperties.SCROLL_BAR_SHOW_BUTTONS:
+						JScrollBar vsb = scrollpane.getVerticalScrollBar();
+						JScrollBar hsb = scrollpane.getHorizontalScrollBar();
+						if( vsb != null ) {
+							vsb.revalidate();
+							vsb.repaint();
+						}
+						if( hsb != null ) {
+							hsb.revalidate();
+							hsb.repaint();
+						}
+						break;
+
+					case ScrollPaneConstants.LOWER_LEFT_CORNER:
+					case ScrollPaneConstants.LOWER_RIGHT_CORNER:
+					case ScrollPaneConstants.UPPER_LEFT_CORNER:
+					case ScrollPaneConstants.UPPER_RIGHT_CORNER:
+						// remove border from buttons added to corners
+						Object corner = e.getNewValue();
+						if( corner instanceof JButton &&
+							((JButton)corner).getBorder() instanceof FlatButtonBorder &&
+							scrollpane.getViewport() != null &&
+							scrollpane.getViewport().getView() instanceof JTable )
+						{
+							((JButton)corner).setBorder( BorderFactory.createEmptyBorder() );
+							((JButton)corner).setFocusable( false );
+						}
+					break;
+				}
+			}
+		};
+	}
+
+	private Handler getHandler() {
 		if( handler == null )
 			handler = new Handler();
 		return handler;