Merge PR #988: System File Chooser

- fixed build issue on ubuntu arm64
- disabled signing on macOS (because it no longer works and I have no idea how to fix it)

.github/workflows/natives.yml

@@ -33,13 +33,30 @@ jobs:
 
             - uses: gradle/actions/wrapper-validation@v4
 
-            - name: install libxt-dev
+            - name: apt update (Linux)
               if: matrix.os == 'ubuntu-latest' || matrix.os == 'ubuntu-24.04-arm'
-              run: sudo apt install libxt-dev
+              run: sudo apt-get update
 
-            - name: install g++-aarch64-linux-gnu
+            - name: install libxt-dev and libgtk-3-dev (Linux)
-              if: matrix.os == 'ubuntu-latest'
+              if: matrix.os == 'ubuntu-latest' || matrix.os == 'ubuntu-24.04-arm'
-              run: sudo apt install g++-aarch64-linux-gnu
+              run: sudo apt-get install libxt-dev libgtk-3-dev
+
+#           - name: Download libgtk-3.so for arm64 (Linux)
+#             if: matrix.os == 'ubuntu-latest'
+#             working-directory: flatlaf-natives/flatlaf-natives-linux/lib/aarch64
+#             run: |
+#               pwd
+#               ls -l /usr/lib/x86_64-linux-gnu/libgtk*
+#               wget --no-verbose https://ports.ubuntu.com/pool/main/g/gtk%2b3.0/libgtk-3-0_3.24.18-1ubuntu1_arm64.deb
+#               ls -l
+#               ar -x libgtk-3-0_3.24.18-1ubuntu1_arm64.deb data.tar.xz
+#               tar -xvf data.tar.xz --wildcards --to-stdout "./usr/lib/aarch64-linux-gnu/libgtk-3.so.0.*" > libgtk-3.so
+#               rm libgtk-3-0_3.24.18-1ubuntu1_arm64.deb data.tar.xz
+#               ls -l
+
+#           - name: install g++-aarch64-linux-gnu (Linux)
+#             if: matrix.os == 'ubuntu-latest'
+#             run: sudo apt-get install g++-aarch64-linux-gnu
 
             - name: Setup Java 11
               uses: actions/setup-java@v4
@@ -53,10 +70,60 @@ jobs:
               #   tar.exe: Couldn't open ~/.gradle/caches/modules-2/modules-2.lock: Permission denied
               run: ./gradlew build-natives --no-daemon
 
+            - name: Sign Windows DLLs
+              if: matrix.os == 'windows-latest'
+              uses: skymatic/code-sign-action@v3
+              with:
+                certificate: '${{ secrets.CODE_SIGN_CERT_BASE64 }}'
+                password: '${{ secrets.CODE_SIGN_CERT_PASSWORD }}'
+                certificatesha1: '${{ secrets.CODE_SIGN_CERT_SHA1 }}'
+                folder: 'flatlaf-core/src/main/resources/com/formdev/flatlaf/natives'
+
+            - name: Sign macOS natives
+              if: matrix.os == 'DISABLED--macos-latest'
+              env:
+                CERT_BASE64: ${{ secrets.CODE_SIGN_CERT_BASE64 }}
+                CERT_PASSWORD: ${{ secrets.CODE_SIGN_CERT_PASSWORD }}
+                CERT_IDENTITY: ${{ secrets.CODE_SIGN_CERT_IDENTITY }}
+              run: |
+                # https://docs.github.com/en/actions/use-cases-and-examples/deploying/installing-an-apple-certificate-on-macos-runners-for-xcode-development
+                # create variables
+                CERTIFICATE_PATH=$RUNNER_TEMP/cert.p12
+                KEYCHAIN_PATH=$RUNNER_TEMP/signing.keychain-db
+                KEYCHAIN_PASSWORD=$CERT_PASSWORD
+                # decode certificate
+                printenv CERT_BASE64 | base64 --decode > $CERTIFICATE_PATH
+                # create temporary keychain
+                security create-keychain -p "$KEYCHAIN_PASSWORD" $KEYCHAIN_PATH
+                security set-keychain-settings -lut 21600 $KEYCHAIN_PATH
+                security unlock-keychain -p "$KEYCHAIN_PASSWORD" $KEYCHAIN_PATH
+                # import certificate to keychain
+                security import $CERTIFICATE_PATH -P "$CERT_PASSWORD" -A -t cert -f pkcs12 -k $KEYCHAIN_PATH
+                # set partition list (required for codesign)
+                security set-key-partition-list -S apple-tool:,apple: -k "$KEYCHAIN_PASSWORD" $KEYCHAIN_PATH
+                # add keychain to keychain search list
+                security list-keychains -d user -s $KEYCHAIN_PATH
+                # sign code
+                codesign --sign "$CERT_IDENTITY" --force --verbose=4 --timestamp \
+                  flatlaf-core/src/main/resources/com/formdev/flatlaf/natives/libflatlaf-macos-*.dylib
+                codesign --display --verbose=4 flatlaf-core/src/main/resources/com/formdev/flatlaf/natives/libflatlaf-macos-*.dylib
+                # cleanup
+                security delete-keychain $KEYCHAIN_PATH
+
+            - name: Set artifacts pattern
+              shell: bash
+              run: |
+                case ${{ matrix.os }} in
+                    windows-latest)    echo "artifactPattern=flatlaf-windows-*.dll"      >> $GITHUB_ENV ;;
+                    macos-latest)      echo "artifactPattern=libflatlaf-macos-*.dylib"   >> $GITHUB_ENV ;;
+                    ubuntu-latest)     echo "artifactPattern=libflatlaf-linux-x86_64.so" >> $GITHUB_ENV ;;
+                    ubuntu-24.04-arm)  echo "artifactPattern=libflatlaf-linux-arm64.so"  >> $GITHUB_ENV ;;
+                esac
+
             - name: Upload artifacts
               uses: actions/upload-artifact@v4
               with:
                   name: FlatLaf-natives-build-artifacts-${{ matrix.os }}
                   path: |
-                      flatlaf-core/src/main/resources/com/formdev/flatlaf/natives
+                      flatlaf-core/src/main/resources/com/formdev/flatlaf/natives/${{ env.artifactPattern }}
                       flatlaf-natives/flatlaf-natives-*/build

CHANGELOG.md

@@ -3,6 +3,13 @@ FlatLaf Change Log
 
 ## 3.7-SNAPSHOT
 
+#### New features and improvements
+
+- System File Chooser allows using **operating system file dialogs** in Java
+  Swing applications. (PR #988)
+
+#### Fixed bugs
+
 - TextField: Fixed wrong leading/trailing icon placement if border is set to
   `null`. (issue #1047)
 - Extras: UI defaults inspector: Exclude inspector window from being blocked by
@@ -10,6 +17,7 @@ FlatLaf Change Log
 - JideButton, JideToggleButton, JideSplitButton and JideToggleSplitButton: Paint
   border in button style `TOOLBAR_STYLE` if in selected state. (issue #1045)
 
+
 ## 3.6.2
 
 #### New features and improvements

flatlaf-core/build.gradle.kts

@@ -113,6 +113,10 @@ tasks {
 					"version" to version,
 					"release" to "1.8", // Java version
 					"failonerror" to "true" )
+
+				"fixcrlf"(
+					"file" to "${project.name}-sigtest.txt",
+					"eol" to "lf" )
 			}
 		}
 	}

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

@@ -16,8 +16,10 @@
 
 package com.formdev.flatlaf;
 
+import javax.swing.JFileChooser;
 import javax.swing.JPopupMenu;
 import javax.swing.SwingUtilities;
+import com.formdev.flatlaf.util.SystemFileChooser;
 import com.formdev.flatlaf.util.UIScale;
 
 /**
@@ -246,6 +248,17 @@ public interface FlatSystemProperties
 	 */
 	String USE_SUB_MENU_SAFE_TRIANGLE = "flatlaf.useSubMenuSafeTriangle";
 
+	/**
+	 * Specifies whether {@link SystemFileChooser} uses operating system file dialogs.
+	 * If set to {@code false}, the {@link JFileChooser} is used instead.
+	 * <p>
+	 * <strong>Allowed Values</strong> {@code false} and {@code true}<br>
+	 * <strong>Default</strong> {@code true}
+	 *
+	 * @since 3.7
+	 */
+	String USE_SYSTEM_FILE_CHOOSER = "flatlaf.useSystemFileChooser";
+
 	/**
 	 * Checks whether a system property is set and returns {@code true} if its value
 	 * is {@code "true"} (case-insensitive), otherwise it returns {@code false}.

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

@@ -24,6 +24,7 @@ import java.awt.event.MouseEvent;
 import java.awt.geom.AffineTransform;
 import javax.swing.JDialog;
 import javax.swing.JFrame;
+import javax.swing.JOptionPane;
 import com.formdev.flatlaf.util.SystemInfo;
 
 /**
@@ -34,9 +35,9 @@ import com.formdev.flatlaf.util.SystemInfo;
  * @author Karl Tauber
  * @since 2.5
  */
-class FlatNativeLinuxLibrary
+public class FlatNativeLinuxLibrary
 {
-	private static int API_VERSION_LINUX = 3001;
+	private static int API_VERSION_LINUX = 3002;
 
 	/**
 	 * Checks whether native library is loaded/available.
@@ -44,10 +45,13 @@ class FlatNativeLinuxLibrary
 	 * <b>Note</b>: It is required to invoke this method before invoking any other
 	 *              method of this class. Otherwise, the native library may not be loaded.
 	 */
-	static boolean isLoaded() {
+	public static boolean isLoaded() {
 		return SystemInfo.isLinux && FlatNativeLibrary.isLoaded( API_VERSION_LINUX );
 	}
 
+
+	//---- X Window System ----------------------------------------------------
+
 	// direction for _NET_WM_MOVERESIZE message
 	// see https://specifications.freedesktop.org/wm-spec/latest/ar01s04.html
 	static final int
@@ -124,4 +128,109 @@ class FlatNativeLinuxLibrary
 		return (window instanceof JFrame && JFrame.isDefaultLookAndFeelDecorated() && ((JFrame)window).isUndecorated()) ||
 			(window instanceof JDialog && JDialog.isDefaultLookAndFeelDecorated() && ((JDialog)window).isUndecorated());
 	}
+
+
+	//---- GTK ----------------------------------------------------------------
+
+	private static Boolean isGtk3Available;
+
+	/**
+	 * Checks whether GTK 3 is available.
+	 * Use this before invoking any native method that uses GTK.
+	 * Otherwise the app may terminate immediately if GTK is not installed.
+	 * <p>
+	 * This works because Java uses {@code dlopen(RTLD_LAZY)} to load JNI libraries,
+	 * which only resolves symbols as the code that references them is executed.
+	 *
+	 * @since 3.7
+	 */
+	public static boolean isGtk3Available() {
+		if( isGtk3Available == null )
+			isGtk3Available = isLibAvailable( "libgtk-3.so.0" ) || isLibAvailable( "libgtk-3.so" );
+		return isGtk3Available;
+	}
+
+	private native static boolean isLibAvailable( String libname );
+
+	/**
+	 * https://docs.gtk.org/gtk3/iface.FileChooser.html#properties
+	 *
+	 * @since 3.7
+	 */
+	public static final int
+		FC_select_folder					= 1 << 0,
+		FC_select_multiple					= 1 << 1,
+		FC_show_hidden						= 1 << 2,
+		FC_local_only						= 1 << 3,  // default
+		FC_do_overwrite_confirmation		= 1 << 4,  // GTK 3 only; removed and always-on in GTK 4
+		FC_create_folders					= 1 << 5;  // default for Save
+
+	/**
+	 * Shows the Linux/GTK system file dialog
+	 * <a href="https://docs.gtk.org/gtk3/class.FileChooserDialog.html">GtkFileChooserDialog</a>.
+	 * <p>
+	 * Uses {@code GTK_FILE_CHOOSER_ACTION_SELECT_FOLDER} if {@link #FC_select_folder} is set in parameter {@code optionsSet}.
+	 * Otherwise uses {@code GTK_FILE_CHOOSER_ACTION_OPEN} if parameter {@code open} is {@code true},
+	 * or {@code GTK_FILE_CHOOSER_ACTION_SAVE} if {@code false}.
+	 * <p>
+	 * <b>Note:</b> This method blocks the current thread until the user closes
+	 * the file dialog. It is highly recommended to invoke it from a new thread
+	 * to avoid blocking the AWT event dispatching thread.
+	 *
+	 * @param owner the owner of the file dialog; or {@code null}
+	 * @param open if {@code true}, shows the open dialog; if {@code false}, shows the save dialog
+	 * @param title text displayed in dialog title; or {@code null}
+	 * @param okButtonLabel text displayed in default button; or {@code null}.
+	 *        Use '_' for mnemonics (e.g. "_Choose")
+	 *        Use '__' for '_' character (e.g. "Choose__and__Quit").
+	 * @param currentName user-editable filename currently shown in the filename field in save dialog; or {@code null}
+	 * @param currentFolder current directory shown in the dialog; or {@code null}
+	 * @param optionsSet options to set; see {@code FOS_*} constants
+	 * @param optionsClear options to clear; see {@code FOS_*} constants
+	 * @param callback approve callback; or {@code null}
+	 * @param fileTypeIndex the file type that appears as selected (zero-based)
+	 * @param fileTypes file types that the dialog can open or save.
+	 *        Two or more strings and {@code null} are required for each filter.
+	 *        First string is the display name of the filter shown in the combobox (e.g. "Text Files").
+	 *        Subsequent strings are the filter patterns (e.g. "*.txt" or "*").
+	 *        {@code null} is required to mark end of filter.
+	 * @return file path(s) that the user selected; an empty array if canceled;
+	 *         or {@code null} on failures (no dialog shown)
+	 *
+	 * @since 3.7
+	 */
+	public native static String[] showFileChooser( Window owner, boolean open,
+		String title, String okButtonLabel, String currentName, String currentFolder,
+		int optionsSet, int optionsClear, FileChooserCallback callback,
+		int fileTypeIndex, String... fileTypes );
+
+	/** @since 3.7 */
+	public interface FileChooserCallback {
+		boolean approve( String[] files, long hwndFileDialog );
+	}
+
+	/**
+	 * Shows a GTK message box
+	 * <a href="https://docs.gtk.org/gtk3/class.MessageDialog.html">GtkMessageDialog</a>.
+	 * <p>
+	 * For use in {@link FileChooserCallback} only.
+	 *
+	 * @param hwndParent the parent of the message box
+	 * @param messageType type of message being displayed:
+	 *        {@link JOptionPane#ERROR_MESSAGE}, {@link JOptionPane#INFORMATION_MESSAGE},
+	 *        {@link JOptionPane#WARNING_MESSAGE}, {@link JOptionPane#QUESTION_MESSAGE} or
+	 *        {@link JOptionPane#PLAIN_MESSAGE}
+	 * @param primaryText primary text; if the dialog has a secondary text,
+	 *        this will appear as title in a larger bold font
+	 * @param secondaryText secondary text; shown below of primary text; or {@code null}
+	 * @param defaultButton index of the default button, which can be pressed using ENTER key
+	 * @param buttons texts of the buttons; if no buttons given the a default "OK" button is shown.
+	 *        Use '_' for mnemonics (e.g. "_Choose")
+	 *        Use '__' for '_' character (e.g. "Choose__and__Quit").
+	 * @return index of pressed button; or -1 for ESC key
+	 *
+	 * @since 3.7
+	 */
+	public native static int showMessageDialog( long hwndParent, int messageType,
+		String primaryText, String secondaryText, int defaultButton, String... buttons );
 }

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

@@ -18,6 +18,7 @@ package com.formdev.flatlaf.ui;
 
 import java.awt.Rectangle;
 import java.awt.Window;
+import javax.swing.JOptionPane;
 import com.formdev.flatlaf.util.SystemInfo;
 
 /**
@@ -44,7 +45,7 @@ import com.formdev.flatlaf.util.SystemInfo;
  */
 public class FlatNativeMacLibrary
 {
-	private static int API_VERSION_MACOS = 2001;
+	private static int API_VERSION_MACOS = 2002;
 
 	/**
 	 * Checks whether native library is loaded/available.
@@ -68,4 +69,88 @@ public class FlatNativeMacLibrary
 	/** @since 3.4 */ public native static Rectangle getWindowButtonsBounds( Window window );
 	/** @since 3.4 */ public native static boolean isWindowFullScreen( Window window );
 	/** @since 3.4 */ public native static boolean toggleWindowFullScreen( Window window );
+
+
+	/** @since 3.7 */
+	public static final int
+		// NSOpenPanel (extends NSSavePanel)
+		FC_canChooseFiles					= 1 << 0,  // default
+		FC_canChooseDirectories				= 1 << 1,
+		FC_resolvesAliases					= 1 << 2,  // default
+		FC_allowsMultipleSelection			= 1 << 3,
+		FC_accessoryViewDisclosed			= 1 << 4,
+		// NSSavePanel
+		FC_showsTagField					= 1 << 8,  // default for Save
+		FC_canCreateDirectories				= 1 << 9,  // default for Save
+		FC_canSelectHiddenExtension			= 1 << 10,
+		FC_showsHiddenFiles					= 1 << 11,
+		FC_extensionHidden					= 1 << 12,
+		FC_allowsOtherFileTypes				= 1 << 13,
+		FC_treatsFilePackagesAsDirectories	= 1 << 14,
+		// custom
+		FC_showSingleFilterField			= 1 << 24;
+
+	/**
+	 * Shows the macOS system file dialogs
+	 * <a href="https://developer.apple.com/documentation/appkit/nsopenpanel?language=objc">NSOpenPanel</a> or
+	 * <a href="https://developer.apple.com/documentation/appkit/nssavepanel?language=objc">NSSavePanel</a>.
+	 * <p>
+	 * <b>Note:</b> This method blocks the current thread until the user closes
+	 * the file dialog. It is highly recommended to invoke it from a new thread
+	 * to avoid blocking the AWT event dispatching thread.
+	 *
+	 * @param owner the owner of the file dialog; or {@code null}
+	 * @param dark appearance of the file dialog: {@code 1} = dark, {@code 0} = light, {@code -1} = default
+	 * @param open if {@code true}, shows the open dialog; if {@code false}, shows the save dialog
+	 * @param title text displayed at top of save dialog (not used in open dialog); or {@code null}
+	 * @param prompt text displayed in default button; or {@code null}
+	 * @param message text displayed at top of open/save dialogs; or {@code null}
+	 * @param filterFieldLabel text displayed in front of the filter combobox; or {@code null}
+	 * @param nameFieldLabel text displayed in front of the filename text field in save dialog (not used in open dialog); or {@code null}
+	 * @param nameFieldStringValue user-editable filename currently shown in the name field in save dialog (not used in open dialog); or {@code null}
+	 * @param directoryURL current directory shown in the dialog; or {@code null}
+	 * @param optionsSet options to set; see {@code FC_*} constants
+	 * @param optionsClear options to clear; see {@code FC_*} constants
+	 * @param fileTypeIndex the file type that appears as selected (zero-based)
+	 * @param fileTypes file types that the dialog can open or save.
+	 *        Two or more strings and {@code null} are required for each filter.
+	 *        First string is the display name of the filter shown in the combobox (e.g. "Text Files").
+	 *        Subsequent strings are the filter patterns (e.g. "txt" or "*").
+	 *        {@code null} is required to mark end of filter.
+	 * @return file path(s) that the user selected; an empty array if canceled;
+	 *         or {@code null} on failures (no dialog shown)
+	 *
+	 * @since 3.7
+	 */
+	public native static String[] showFileChooser( Window owner, int dark, boolean open,
+		String title, String prompt, String message, String filterFieldLabel,
+		String nameFieldLabel, String nameFieldStringValue, String directoryURL,
+		int optionsSet, int optionsClear, FileChooserCallback callback,
+		int fileTypeIndex, String... fileTypes );
+
+	/** @since 3.7 */
+	public interface FileChooserCallback {
+		boolean approve( String[] files, long hwndFileDialog );
+	}
+
+	/**
+	 * Shows a macOS alert
+	 * <a href="https://developer.apple.com/documentation/appkit/nsalert?language=objc">NSAlert</a>.
+	 * <p>
+	 * For use in {@link FileChooserCallback} only.
+	 *
+	 * @param hwndParent the parent of the message box
+	 * @param alertStyle type of alert being displayed:
+	 *        {@link JOptionPane#ERROR_MESSAGE}, {@link JOptionPane#INFORMATION_MESSAGE} or
+	 *        {@link JOptionPane#WARNING_MESSAGE}
+	 * @param messageText main message of the alert
+	 * @param informativeText additional information about the alert; shown below of main message; or {@code null}
+	 * @param defaultButton index of the default button, which can be pressed using ENTER key
+	 * @param buttons texts of the buttons; if no buttons given the a default "OK" button is shown
+	 * @return index of pressed button
+	 *
+	 * @since 3.7
+	 */
+	public native static int showMessageDialog( long hwndParent, int alertStyle,
+		String messageText, String informativeText, int defaultButton, String... buttons );
 }

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

@@ -18,6 +18,7 @@ package com.formdev.flatlaf.ui;
 
 import java.awt.Color;
 import java.awt.Window;
+import javax.swing.JOptionPane;
 import com.formdev.flatlaf.util.SystemInfo;
 
 /**
@@ -30,7 +31,7 @@ import com.formdev.flatlaf.util.SystemInfo;
  */
 public class FlatNativeWindowsLibrary
 {
-	private static int API_VERSION_WINDOWS = 1001;
+	private static int API_VERSION_WINDOWS = 1002;
 
 	private static long osBuildNumber = Long.MIN_VALUE;
 
@@ -158,4 +159,125 @@ public class FlatNativeWindowsLibrary
 		// DwmSetWindowAttribute() expects COLORREF as attribute value, which is defined as DWORD
 		return dwmSetWindowAttributeDWORD( hwnd, attribute, rgb );
 	}
+
+
+	/**
+	 * FILEOPENDIALOGOPTIONS
+	 * see https://learn.microsoft.com/en-us/windows/win32/api/shobjidl_core/ne-shobjidl_core-_fileopendialogoptions
+	 *
+	 * @since 3.7
+	 */
+	public static final int
+		FOS_OVERWRITEPROMPT = 0x2,		// default for Save
+		FOS_STRICTFILETYPES = 0x4,
+		FOS_NOCHANGEDIR = 0x8,			// default
+		FOS_PICKFOLDERS = 0x20,
+		FOS_FORCEFILESYSTEM = 0x40,
+		FOS_ALLNONSTORAGEITEMS = 0x80,
+		FOS_NOVALIDATE = 0x100,
+		FOS_ALLOWMULTISELECT = 0x200,
+		FOS_PATHMUSTEXIST = 0x800,		// default
+		FOS_FILEMUSTEXIST = 0x1000,		// default for Open
+		FOS_CREATEPROMPT = 0x2000,
+		FOS_SHAREAWARE = 0x4000,
+		FOS_NOREADONLYRETURN = 0x8000,	// default for Save
+		FOS_NOTESTFILECREATE = 0x10000,
+		FOS_HIDEMRUPLACES = 0x20000,
+		FOS_HIDEPINNEDPLACES = 0x40000,
+		FOS_NODEREFERENCELINKS = 0x100000,
+		FOS_OKBUTTONNEEDSINTERACTION = 0x200000,
+		FOS_DONTADDTORECENT = 0x2000000,
+		FOS_FORCESHOWHIDDEN = 0x10000000,
+		FOS_DEFAULTNOMINIMODE = 0x20000000,
+		FOS_FORCEPREVIEWPANEON = 0x40000000,
+		FOS_SUPPORTSTREAMABLEITEMS = 0x80000000;
+
+	/**
+	 * Shows the Windows system
+	 * <a href="https://learn.microsoft.com/en-us/windows/win32/shell/common-file-dialog">file dialogs</a>
+	 * <a href="https://learn.microsoft.com/en-us/windows/win32/api/shobjidl_core/nn-shobjidl_core-ifileopendialog">IFileOpenDialog</a> or
+	 * <a href="https://learn.microsoft.com/en-us/windows/win32/api/shobjidl_core/nn-shobjidl_core-ifilesavedialog">IFileSaveDialog</a>.
+	 * <p>
+	 * <b>Note:</b> This method blocks the current thread until the user closes
+	 * the file dialog. It is highly recommended to invoke it from a new thread
+	 * to avoid blocking the AWT event dispatching thread.
+	 *
+	 * @param owner the owner of the file dialog; or {@code null}
+	 * @param open if {@code true}, shows the open dialog; if {@code false}, shows the save dialog
+	 * @param title text displayed in dialog title; or {@code null}
+	 * @param okButtonLabel text displayed in default button; or {@code null}.
+	 *        Use '&amp;' for mnemonics (e.g. "&amp;Choose").
+	 *        Use '&amp;&amp;' for '&amp;' character (e.g. "Choose &amp;&amp; Quit").
+	 * @param fileNameLabel text displayed in front of the filename text field; or {@code null}
+	 * @param fileName user-editable filename currently shown in the filename field; or {@code null}
+	 * @param folder current directory shown in the dialog; or {@code null}
+	 * @param saveAsItem file to be used as the initial entry in a Save As dialog; or {@code null}.
+	 *        File name is shown in filename text field, folder is selected in view.
+	 *        To be used for saving files that already exist. For new files use {@code fileName}.
+	 * @param defaultFolder folder used as a default if there is not a recently used folder value available; or {@code null}.
+	 *        Windows somewhere stores default folder on a per-app basis.
+	 *        So this is probably used only once when the app opens a file dialog for first time.
+	 * @param defaultExtension default extension to be added to file name in save dialog; or {@code null}
+	 * @param optionsSet options to set; see {@code FOS_*} constants
+	 * @param optionsClear options to clear; see {@code FOS_*} constants
+	 * @param callback approve callback; or {@code null}
+	 * @param fileTypeIndex the file type that appears as selected (zero-based)
+	 * @param fileTypes file types that the dialog can open or save.
+	 *        Pairs of strings are required for each filter.
+	 *        First string is the display name of the filter shown in the combobox (e.g. "Text Files").
+	 *        Second string is the filter pattern (e.g. "*.txt", "*.exe;*.dll" or "*.*").
+	 * @return file path(s) that the user selected; an empty array if canceled;
+	 *         or {@code null} on failures (no dialog shown)
+	 *
+	 * @since 3.7
+	 */
+	public native static String[] showFileChooser( Window owner, boolean open,
+		String title, String okButtonLabel, String fileNameLabel, String fileName,
+		String folder, String saveAsItem, String defaultFolder, String defaultExtension,
+		int optionsSet, int optionsClear, FileChooserCallback callback,
+		int fileTypeIndex, String... fileTypes );
+
+	/** @since 3.7 */
+	public interface FileChooserCallback {
+		boolean approve( String[] files, long hwndFileDialog );
+	}
+
+	/**
+	 * Shows a modal Windows message dialog.
+	 * <p>
+	 * For use in {@link FileChooserCallback} only.
+	 *
+	 * @param hwndParent the parent of the message box
+	 * @param messageType type of message being displayed:
+	 *        {@link JOptionPane#ERROR_MESSAGE}, {@link JOptionPane#INFORMATION_MESSAGE},
+	 *        {@link JOptionPane#WARNING_MESSAGE}, {@link JOptionPane#QUESTION_MESSAGE} or
+	 *        {@link JOptionPane#PLAIN_MESSAGE}
+	 * @param title dialog box title; or {@code null} to use title from parent window
+	 * @param text message to be displayed
+	 * @param defaultButton index of the default button, which can be pressed using ENTER key
+	 * @param buttons texts of the buttons.
+	 *        Use '&amp;' for mnemonics (e.g. "&amp;Choose").
+	 *        Use '&amp;&amp;' for '&amp;' character (e.g. "Choose &amp;&amp; Quit").
+	 * @return index of pressed button; or -1 for ESC key
+	 *
+	 * @since 3.7
+	 */
+	public native static int showMessageDialog( long hwndParent, int messageType,
+		String title, String text, int defaultButton, String... buttons );
+
+	/**
+	 * Shows a Windows message box
+	 * <a href="https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-messagebox">MessageBox</a>.
+	 * <p>
+	 * For use in {@link FileChooserCallback} only.
+	 *
+	 * @param hwndParent the parent of the message box
+	 * @param text message to be displayed
+	 * @param caption dialog box title
+	 * @param type see <a href="https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-messagebox#parameters">MessageBox parameter uType</a>
+	 * @return see <a href="https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-messagebox#return-value">MessageBox Return value</a>
+	 *
+	 * @since 3.7
+	 */
+	public native static int showMessageBox( long hwndParent, String text, String caption, int type );
 }

flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/DemoFrame.java

@@ -18,6 +18,7 @@ package com.formdev.flatlaf.demo;
 
 import java.awt.*;
 import java.awt.event.*;
+import java.io.File;
 import java.io.IOException;
 import java.net.URI;
 import java.net.URISyntaxException;
@@ -49,6 +50,7 @@ import com.formdev.flatlaf.extras.FlatSVGUtils;
 import com.formdev.flatlaf.util.ColorFunctions;
 import com.formdev.flatlaf.util.FontUtils;
 import com.formdev.flatlaf.util.LoggingFacade;
+import com.formdev.flatlaf.util.SystemFileChooser;
 import com.formdev.flatlaf.util.SystemInfo;
 import net.miginfocom.layout.ConstraintParser;
 import net.miginfocom.layout.LC;
@@ -172,6 +174,48 @@ class DemoFrame
 		chooser.showSaveDialog( this );
 	}
 
+	private void openSystemActionPerformed() {
+		SystemFileChooser chooser = new SystemFileChooser();
+		chooser.setMultiSelectionEnabled( true );
+		chooser.addChoosableFileFilter( new SystemFileChooser.FileNameExtensionFilter(
+			"Text Files", "txt", "md" ) );
+		chooser.addChoosableFileFilter( new SystemFileChooser.FileNameExtensionFilter(
+			"PDF Files", "pdf" ) );
+		chooser.addChoosableFileFilter( new SystemFileChooser.FileNameExtensionFilter(
+			"Archives", "zip", "tar", "jar", "7z" ) );
+
+		if( chooser.showOpenDialog( this ) != SystemFileChooser.APPROVE_OPTION )
+			return;
+
+		File[] files = chooser.getSelectedFiles();
+		System.out.println( Arrays.toString( files ).replace( ",", "\n" ) );
+	}
+
+	private void saveAsSystemActionPerformed() {
+		SystemFileChooser chooser = new SystemFileChooser();
+		chooser.addChoosableFileFilter( new SystemFileChooser.FileNameExtensionFilter(
+			"Text Files", "txt", "md" ) );
+		chooser.addChoosableFileFilter( new SystemFileChooser.FileNameExtensionFilter(
+			"Images", "png", "gif", "jpg" ) );
+
+		if( chooser.showSaveDialog( this ) != SystemFileChooser.APPROVE_OPTION )
+			return;
+
+		File file = chooser.getSelectedFile();
+		System.out.println( file );
+	}
+
+	private void selectFolderSystemActionPerformed() {
+		SystemFileChooser chooser = new SystemFileChooser();
+		chooser.setFileSelectionMode( SystemFileChooser.DIRECTORIES_ONLY );
+
+		if( chooser.showOpenDialog( this ) != SystemFileChooser.APPROVE_OPTION )
+			return;
+
+		File directory  = chooser.getSelectedFile();
+		System.out.println( directory  );
+	}
+
 	private void exitActionPerformed() {
 		dispose();
 	}
@@ -508,6 +552,9 @@ class DemoFrame
 		JMenuItem newMenuItem = new JMenuItem();
 		JMenuItem openMenuItem = new JMenuItem();
 		JMenuItem saveAsMenuItem = new JMenuItem();
+		JMenuItem openSystemMenuItem = new JMenuItem();
+		JMenuItem saveAsSystemMenuItem = new JMenuItem();
+		JMenuItem selectFolderSystemMenuItem = new JMenuItem();
 		JMenuItem closeMenuItem = new JMenuItem();
 		exitMenuItem = new JMenuItem();
 		JMenu editMenu = new JMenu();
@@ -608,6 +655,25 @@ class DemoFrame
 				fileMenu.add(saveAsMenuItem);
 				fileMenu.addSeparator();
 
+				//---- openSystemMenuItem ----
+				openSystemMenuItem.setText("Open (System)...");
+				openSystemMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()|KeyEvent.SHIFT_DOWN_MASK));
+				openSystemMenuItem.addActionListener(e -> openSystemActionPerformed());
+				fileMenu.add(openSystemMenuItem);
+
+				//---- saveAsSystemMenuItem ----
+				saveAsSystemMenuItem.setText("Save As (System)...");
+				saveAsSystemMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()|KeyEvent.SHIFT_DOWN_MASK));
+				saveAsSystemMenuItem.addActionListener(e -> saveAsSystemActionPerformed());
+				fileMenu.add(saveAsSystemMenuItem);
+
+				//---- selectFolderSystemMenuItem ----
+				selectFolderSystemMenuItem.setText("Select Folder (System)...");
+				selectFolderSystemMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F, Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()|KeyEvent.SHIFT_DOWN_MASK));
+				selectFolderSystemMenuItem.addActionListener(e -> selectFolderSystemActionPerformed());
+				fileMenu.add(selectFolderSystemMenuItem);
+				fileMenu.addSeparator();
+
 				//---- closeMenuItem ----
 				closeMenuItem.setText("Close");
 				closeMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_W, Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()));

flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/DemoFrame.jfd

@@ -1,4 +1,4 @@
-JFDML JFormDesigner: "8.2.1.0.348" Java: "21.0.1" encoding: "UTF-8"
+JFDML JFormDesigner: "8.3" encoding: "UTF-8"
 
 new FormModel {
 	contentType: "form/swing"
@@ -182,6 +182,27 @@ new FormModel {
 						"mnemonic": 83
 						addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "saveAsActionPerformed", false ) )
 					} )
+					add( new FormComponent( "javax.swing.JPopupMenu$Separator" ) {
+						name: "separator9"
+					} )
+					add( new FormComponent( "javax.swing.JMenuItem" ) {
+						name: "openSystemMenuItem"
+						"text": "Open (System)..."
+						"accelerator": static javax.swing.KeyStroke getKeyStroke( 79, 4291, false )
+						addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "openSystemActionPerformed", false ) )
+					} )
+					add( new FormComponent( "javax.swing.JMenuItem" ) {
+						name: "saveAsSystemMenuItem"
+						"text": "Save As (System)..."
+						"accelerator": static javax.swing.KeyStroke getKeyStroke( 83, 4291, false )
+						addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "saveAsSystemActionPerformed", false ) )
+					} )
+					add( new FormComponent( "javax.swing.JMenuItem" ) {
+						name: "selectFolderSystemMenuItem"
+						"text": "Select Folder (System)..."
+						"accelerator": static javax.swing.KeyStroke getKeyStroke( 70, 4291, false )
+						addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "selectFolderSystemActionPerformed", false ) )
+					} )
 					add( new FormComponent( "javax.swing.JPopupMenu$Separator" ) {
 						name: "separator2"
 					} )

flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/FlatLafDemo.java

@@ -17,6 +17,7 @@
 package com.formdev.flatlaf.demo;
 
 import java.awt.Dimension;
+import java.util.prefs.Preferences;
 import javax.swing.JDialog;
 import javax.swing.JFrame;
 import javax.swing.SwingUtilities;
@@ -27,6 +28,7 @@ import com.formdev.flatlaf.fonts.inter.FlatInterFont;
 import com.formdev.flatlaf.fonts.jetbrains_mono.FlatJetBrainsMonoFont;
 import com.formdev.flatlaf.fonts.roboto.FlatRobotoFont;
 import com.formdev.flatlaf.fonts.roboto_mono.FlatRobotoMonoFont;
+import com.formdev.flatlaf.util.SystemFileChooser;
 import com.formdev.flatlaf.util.SystemInfo;
 
 /**
@@ -73,6 +75,28 @@ public class FlatLafDemo
 		DemoPrefs.init( PREFS_ROOT_PATH );
 		DemoPrefs.initSystemScale();
 
+		// SystemFileChooser state storage
+		SystemFileChooser.setStateStore( new SystemFileChooser.StateStore() {
+			private static final String KEY_PREFIX = "fileChooser.";
+			private final Preferences state = Preferences.userRoot().node( PREFS_ROOT_PATH );
+
+			@Override
+			public String get( String key, String def ) {
+				String value = state.get( KEY_PREFIX + key, def );
+				System.out.println( "SystemFileChooser State GET " + key + " = " + value );
+				return value;
+			}
+
+			@Override
+			public void put( String key, String value ) {
+				System.out.println( "SystemFileChooser State PUT " + key + " = " + value );
+				if( value != null )
+					state.put( KEY_PREFIX + key, value );
+				else
+					state.remove( KEY_PREFIX + key );
+			}
+		} );
+
 		SwingUtilities.invokeLater( () -> {
 			// install fonts for lazy loading
 			FlatInterFont.installLazy();

flatlaf-natives/flatlaf-natives-linux/README.md

@@ -25,6 +25,7 @@ To build the library on Linux, some packages needs to be installed:
 
 - `build-essential` - GCC and development tools
 - `libxt-dev` - X11 toolkit development headers
+- `libgtk-3-dev` - GTK 3 toolkit development headers
 - `g++-aarch64-linux-gnu` - GNU C++ compiler for the arm64 architecture (only on
   x86_64 Linux for cross-compiling for arm64 architecture)
 
@@ -32,19 +33,39 @@ To build the library on Linux, some packages needs to be installed:
 ### Ubuntu
 
 ~~~
-sudo apt update
+sudo apt-get update
-sudo apt install build-essential libxt-dev
+sudo apt-get install build-essential libxt-dev libgtk-3-dev
 ~~~
 
-Only on x86_64 Linux for cross-compiling for arm64 architecture:
+#### Cross-compile for arm64 architecture on x86_64 Linux
+
+Only needed on x86_64 Linux if you want cross-compile for arm64 architecture:
 
 ~~~
-sudo apt install g++-aarch64-linux-gnu
+sudo apt-get install g++-aarch64-linux-gnu
+~~~
+
+Download `libgtk-3.so` for arm64 architecture:
+
+~~~
+cd flatlaf-natives/flatlaf-natives-linux/lib/aarch64
+wget --no-verbose https://ports.ubuntu.com/pool/main/g/gtk%2b3.0/libgtk-3-0_3.24.18-1ubuntu1_arm64.deb
+ar -x libgtk-3-0_3.24.18-1ubuntu1_arm64.deb data.tar.xz
+tar -xvf data.tar.xz --wildcards --to-stdout "./usr/lib/aarch64-linux-gnu/libgtk-3.so.0.*" > libgtk-3.so
+rm libgtk-3-0_3.24.18-1ubuntu1_arm64.deb data.tar.xz
+~~~
+
+
+### Fedora
+
+~~~
+sudo dnf group install c-development
+sudo dnf install libXt-devel gtk3-devel
 ~~~
 
 
 ### CentOS
 
 ~~~
-sudo yum install libXt-devel
+sudo yum install libXt-devel gtk3-devel
 ~~~

flatlaf-natives/flatlaf-natives-linux/build.gradle.kts

@@ -65,15 +65,37 @@ tasks {
 
 		includes.from(
 			"${javaHome}/include",
-			"${javaHome}/include/linux"
+			"${javaHome}/include/linux",
+
+			// for GTK
+			"/usr/include/gtk-3.0",
+			"/usr/include/glib-2.0",
+			if( name.contains( "X86-64" ) ) "/usr/lib/x86_64-linux-gnu/glib-2.0/include"
+									   else "/usr/lib/aarch64-linux-gnu/glib-2.0/include",
+			"/usr/include/gdk-pixbuf-2.0",
+			"/usr/include/atk-1.0",
+			"/usr/include/cairo",
+			"/usr/include/pango-1.0",
+			"/usr/include/harfbuzz",
 		)
 
 		compilerArgs.addAll( toolChain.map {
 			when( it ) {
-				is Gcc, is Clang -> listOf()
+				is Gcc, is Clang -> listOf( "-fvisibility=hidden" )
 				else -> emptyList()
 			}
 		} )
+
+		doFirst {
+			// check required Java version
+			if( JavaVersion.current() < JavaVersion.VERSION_11 ) {
+				println()
+				println( "WARNING: Java 11 or later required to build Linux native library (running ${System.getProperty( "java.version" )})" )
+				println( "         Native library built with older Java versions throw following exception when running in Java 17+:" )
+				println( "         java.lang.UnsatisfiedLinkError: .../libjawt.so: version `SUNWprivate_1.1' not found" )
+				println()
+			}
+		}
 	}
 
 	withType<LinkSharedLibrary>().configureEach {
@@ -88,7 +110,7 @@ tasks {
 
 		linkerArgs.addAll( toolChain.map {
 			when( it ) {
-				is Gcc, is Clang -> listOf( "-L${jawtPath}", "-l${jawt}" )
+				is Gcc, is Clang -> listOf( "-L${jawtPath}", "-l${jawt}", "-lgtk-3" )
 				else -> emptyList()
 			}
 		} )
@@ -128,7 +150,20 @@ tasks {
 				"-I", "${javaHome}/include/linux",
 				"-I", "$include",
 
+				// for GTK
+				"-I", "/usr/include/gtk-3.0",
+				"-I", "/usr/include/glib-2.0",
+				"-I", "/usr/lib/x86_64-linux-gnu/glib-2.0/include",
+				"-I", "/usr/include/gdk-pixbuf-2.0",
+				"-I", "/usr/include/atk-1.0",
+				"-I", "/usr/include/cairo",
+				"-I", "/usr/include/pango-1.0",
+				"-I", "/usr/include/harfbuzz",
+
 				"$src/ApiVersion.cpp",
+				"$src/GtkFileChooser.cpp",
+				"$src/GtkMessageDialog.cpp",
+				"$src/JNIUtils.cpp",
 				"$src/X11WmUtils.cpp",
 			)
 		}
@@ -152,10 +187,15 @@ tasks {
 				"-o", "$outDir/$libraryName",
 
 				"$objDir/ApiVersion.o",
+				"$objDir/GtkFileChooser.o",
+				"$objDir/GtkMessageDialog.o",
+				"$objDir/JNIUtils.o",
 				"$objDir/X11WmUtils.o",
 
+				"-lstdc++",
 				"-L${layout.projectDirectory}/lib/aarch64",
 				"-ljawt",
+				"-lgtk-3",
 			)
 
 			doLast {

flatlaf-natives/flatlaf-natives-linux/src/main/cpp/ApiVersion.cpp

@@ -24,7 +24,7 @@
 
 // increase this version if changing API or functionality of native library
 // also update version in Java class com.formdev.flatlaf.ui.FlatNativeLinuxLibrary
-#define API_VERSION_LINUX		3001
+#define API_VERSION_LINUX		3002
 
 
 //---- JNI methods ------------------------------------------------------------

flatlaf-natives/flatlaf-natives-linux/src/main/cpp/GtkFileChooser.cpp

@@ -0,0 +1,277 @@
+/*
+ * Copyright 2025 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.
+ */
+
+#include <jawt.h>
+#include <linux/jawt_md.h>
+#include <gtk/gtk.h>
+#include <gdk/gdkx.h>
+#include <glib/gi18n.h>
+#include "JNIUtils.h"
+#include "com_formdev_flatlaf_ui_FlatNativeLinuxLibrary.h"
+
+/**
+ * @author Karl Tauber
+ * @since 3.7
+ */
+
+// declare external methods
+extern Window getWindowHandle( JNIEnv* env, JAWT* awt, jobject window, Display** display_return );
+
+// declare internal methods
+static jobjectArray fileListToStringArray( JNIEnv* env, GSList* fileList );
+
+//---- helper -----------------------------------------------------------------
+
+#define isOptionSet( option ) ((optionsSet & com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_ ## option) != 0)
+#define isOptionClear( option ) ((optionsClear & com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_ ## option) != 0)
+#define isOptionSetOrClear( option ) isOptionSet( option ) || isOptionClear( option )
+
+static jobjectArray newJavaStringArray( JNIEnv* env, jsize count ) {
+	jclass stringClass = env->FindClass( "java/lang/String" );
+	return env->NewObjectArray( count, stringClass, NULL );
+}
+
+static void initFilters( GtkFileChooser* chooser, JNIEnv* env, jint fileTypeIndex, jobjectArray fileTypes ) {
+	jint length = env->GetArrayLength( fileTypes );
+	if( length <= 0 )
+		return;
+
+	GtkFileFilter* filter = NULL;
+	int filterIndex = 0;
+	for( int i = 0; i < length; i++ ) {
+		jstring jstr = (jstring) env->GetObjectArrayElement( fileTypes, i );
+		if( jstr == NULL ) {
+			if( filter != NULL ) {
+				gtk_file_chooser_add_filter( chooser, filter );
+				if( fileTypeIndex == filterIndex )
+					gtk_file_chooser_set_filter( chooser, filter );
+				filter = NULL;
+				filterIndex++;
+			}
+			continue;
+		}
+
+		AutoReleaseStringUTF8 str( env, jstr );
+		if( filter == NULL ) {
+			filter = gtk_file_filter_new();
+			gtk_file_filter_set_name( filter, str );
+		} else
+			gtk_file_filter_add_pattern( filter, str );
+	}
+}
+
+static GdkWindow* getGdkWindow( JNIEnv* env, jobject window ) {
+	// get the AWT
+	JAWT awt;
+	awt.version = JAWT_VERSION_1_4;
+	if( !JAWT_GetAWT( env, &awt ) )
+		return NULL;
+
+	// get Xlib window and display from AWT window
+	Display* display;
+	Window w = getWindowHandle( env, &awt, window, &display );
+	if( w == 0 )
+		return NULL;
+
+	// based on GetAllocNativeWindowHandle() from https://github.com/btzy/nativefiledialog-extended
+	// https://github.com/btzy/nativefiledialog-extended/blob/29e3bcb578345b9fa345d1d7683f00c150565ca3/src/nfd_gtk.cpp#L384-L437
+	GdkDisplay* gdkDisplay = gdk_x11_lookup_xdisplay( display );
+	if( gdkDisplay == NULL ) {
+		// search for existing X11 display (there should only be one, even if multiple screens are connected)
+		GdkDisplayManager* displayManager = gdk_display_manager_get();
+		GSList* displays = gdk_display_manager_list_displays( displayManager );
+		for( GSList* l = displays; l; l = l->next ) {
+			if( GDK_IS_X11_DISPLAY( l->data ) ) {
+				gdkDisplay = GDK_DISPLAY( l->data );
+				break;
+			}
+		}
+		g_slist_free( displays );
+
+		// create our own X11 display
+		if( gdkDisplay == NULL ) {
+			gdk_set_allowed_backends( "x11" );
+			gdkDisplay = gdk_display_manager_open_display( displayManager, NULL );
+			gdk_set_allowed_backends( NULL );
+
+			if( gdkDisplay == NULL )
+				return NULL;
+		}
+	}
+
+	return gdk_x11_window_foreign_new_for_display( gdkDisplay, w );
+}
+
+static void handle_realize( GtkWidget* dialog, gpointer data ) {
+	GdkWindow* gdkOwner = static_cast<GdkWindow*>( data );
+
+	// make file dialog a transient of owner window,
+	// which centers file dialog on owner and keeps file dialog above owner
+	gdk_window_set_transient_for( gtk_widget_get_window( dialog ), gdkOwner );
+
+	// necessary because gdk_x11_window_foreign_new_for_display() increases the reference counter
+	g_object_unref( gdkOwner );
+}
+
+struct ResponseData {
+	JNIEnv* env;
+	jobject callback;
+	GSList* fileList;
+
+	ResponseData( JNIEnv* _env, jobject _callback ) {
+		env = _env;
+		callback = _callback;
+		fileList = NULL;
+	}
+};
+
+static void handle_response( GtkWidget* dialog, gint responseId, gpointer data ) {
+	// get filenames if user pressed OK
+	if( responseId == GTK_RESPONSE_ACCEPT ) {
+		ResponseData *response = static_cast<ResponseData*>( data );
+		if( response->callback != NULL ) {
+			GSList* fileList = gtk_file_chooser_get_filenames( GTK_FILE_CHOOSER( dialog ) );
+			jobjectArray files = fileListToStringArray( response->env, fileList );
+
+			GtkWindow* window = GTK_WINDOW( dialog );
+
+			// invoke callback: boolean approve( String[] files, long hwnd );
+			jclass cls = response->env->GetObjectClass( response->callback );
+			jmethodID approveID = response->env->GetMethodID( cls, "approve", "([Ljava/lang/String;J)Z" );
+			if( approveID != NULL && !response->env->CallBooleanMethod( response->callback, approveID, files, window ) )
+				return; // keep dialog open
+		}
+
+		response->fileList = gtk_file_chooser_get_filenames( GTK_FILE_CHOOSER( dialog ) );
+	}
+
+	// hide/destroy file dialog and quit loop
+	gtk_widget_hide( dialog );
+	gtk_widget_destroy( dialog );
+	gtk_main_quit();
+}
+
+//---- JNI methods ------------------------------------------------------------
+
+extern "C"
+JNIEXPORT jobjectArray JNICALL Java_com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_showFileChooser
+	( JNIEnv* env, jclass cls, jobject owner, jboolean open,
+		jstring title, jstring okButtonLabel, jstring currentName, jstring currentFolder,
+		jint optionsSet, jint optionsClear, jobject callback, jint fileTypeIndex, jobjectArray fileTypes )
+{
+	// initialize GTK
+	if( !gtk_init_check( NULL, NULL ) )
+		return NULL;
+
+	// convert Java strings to C strings
+	AutoReleaseStringUTF8 ctitle( env, title );
+	AutoReleaseStringUTF8 cokButtonLabel( env, okButtonLabel );
+	AutoReleaseStringUTF8 ccurrentName( env, currentName );
+	AutoReleaseStringUTF8 ccurrentFolder( env, currentFolder );
+
+	// create GTK file chooser dialog
+	// https://docs.gtk.org/gtk3/class.FileChooserDialog.html
+	bool selectFolder = isOptionSet( FC_select_folder );
+	bool multiSelect = isOptionSet( FC_select_multiple );
+	GtkWidget* dialog = gtk_file_chooser_dialog_new(
+		(ctitle != NULL) ? ctitle
+			: (selectFolder ? (multiSelect ? _("Select Folders") : _("Select Folder"))
+				: (open ? ((multiSelect ? _("Open Files") : _("Open File"))) : _("Save File"))),
+		NULL, // can not use AWT X11 window as parent because GtkWindow is required
+		selectFolder ? GTK_FILE_CHOOSER_ACTION_SELECT_FOLDER
+			: (open ? GTK_FILE_CHOOSER_ACTION_OPEN : GTK_FILE_CHOOSER_ACTION_SAVE),
+		_("_Cancel"), GTK_RESPONSE_CANCEL,
+		(cokButtonLabel != NULL) ? cokButtonLabel
+			: (selectFolder ? _("_Select") : (open ? _("_Open") : _("_Save"))), GTK_RESPONSE_ACCEPT,
+		NULL ); // marks end of buttons
+	GtkFileChooser* chooser = GTK_FILE_CHOOSER( dialog );
+
+	// set current name and folder
+	if( !open && ccurrentName != NULL )
+		gtk_file_chooser_set_current_name( chooser, ccurrentName );
+	if( ccurrentFolder != NULL )
+		gtk_file_chooser_set_current_folder( chooser, ccurrentFolder );
+
+	// set options
+	if( isOptionSetOrClear( FC_select_multiple ) )
+		gtk_file_chooser_set_select_multiple( chooser, isOptionSet( FC_select_multiple ) );
+	if( isOptionSetOrClear( FC_show_hidden ) )
+		gtk_file_chooser_set_show_hidden( chooser, isOptionSet( FC_show_hidden ) );
+	if( isOptionSetOrClear( FC_local_only ) )
+		gtk_file_chooser_set_local_only( chooser, isOptionSet( FC_local_only ) );
+	if( isOptionSetOrClear( FC_do_overwrite_confirmation ) )
+		gtk_file_chooser_set_do_overwrite_confirmation( chooser, isOptionSet( FC_do_overwrite_confirmation ) );
+	if( isOptionSetOrClear( FC_create_folders ) )
+		gtk_file_chooser_set_create_folders( chooser, isOptionSet( FC_create_folders ) );
+
+	// initialize filter
+	initFilters( chooser, env, fileTypeIndex, fileTypes );
+
+	// setup modality
+	GdkWindow* gdkOwner = (owner != NULL) ? getGdkWindow( env, owner ) : NULL;
+	if( gdkOwner != NULL ) {
+		gtk_window_set_modal( GTK_WINDOW( dialog ), true );
+
+		// file dialog should use same screen as owner
+		gtk_window_set_screen( GTK_WINDOW( dialog ), gdk_window_get_screen( gdkOwner ) );
+
+		// set the transient when the file dialog is realized
+		g_signal_connect( dialog, "realize", G_CALLBACK( handle_realize ), gdkOwner );
+	}
+
+	// show dialog
+	// (similar to what's done in sun_awt_X11_GtkFileDialogPeer.c)
+	ResponseData responseData( env, callback );
+	g_signal_connect( dialog, "response", G_CALLBACK( handle_response ), &responseData );
+	gtk_widget_show( dialog );
+
+	// necessary to bring file dialog to the front (and make it active)
+	// see issues:
+	//     https://github.com/btzy/nativefiledialog-extended/issues/31
+	//     https://github.com/mlabbe/nativefiledialog/pull/92
+	//     https://github.com/guillaumechereau/noc/pull/11
+	if( GDK_IS_X11_DISPLAY( gtk_widget_get_display( GTK_WIDGET( dialog ) ) ) ) {
+		GdkWindow* gdkWindow = gtk_widget_get_window( GTK_WIDGET( dialog ) );
+		gdk_window_set_events( gdkWindow, static_cast<GdkEventMask>( gdk_window_get_events( gdkWindow ) | GDK_PROPERTY_CHANGE_MASK ) );
+		gtk_window_present_with_time( GTK_WINDOW( dialog ), gdk_x11_get_server_time( gdkWindow ) );
+	}
+
+	// start event loop (will be quit in respone handler)
+	gtk_main();
+
+	// canceled?
+	if( responseData.fileList == NULL )
+		return newJavaStringArray( env, 0 );
+
+	// convert GSList to Java string array
+	return fileListToStringArray( env, responseData.fileList );
+}
+
+static jobjectArray fileListToStringArray( JNIEnv* env, GSList* fileList ) {
+	guint count = g_slist_length( fileList );
+	jobjectArray array = newJavaStringArray( env, count );
+	GSList* it = fileList;
+	for( int i = 0; i < count; i++, it = it->next ) {
+		gchar* path = (gchar*) it->data;
+		jstring jpath = env->NewStringUTF( path );
+		g_free( path );
+
+		env->SetObjectArrayElement( array, i, jpath );
+		env->DeleteLocalRef( jpath );
+	}
+	g_slist_free( fileList );
+	return array;
+}

flatlaf-natives/flatlaf-natives-linux/src/main/cpp/GtkMessageDialog.cpp

@@ -0,0 +1,76 @@
+/*
+ * Copyright 2025 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.
+ */
+
+#include <jawt.h>
+#include <linux/jawt_md.h>
+#include <gtk/gtk.h>
+#include <gdk/gdkx.h>
+#include <glib/gi18n.h>
+#include "JNIUtils.h"
+#include "com_formdev_flatlaf_ui_FlatNativeLinuxLibrary.h"
+
+/**
+ * @author Karl Tauber
+ * @since 3.7
+ */
+
+extern "C"
+JNIEXPORT jint JNICALL Java_com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_showMessageDialog
+	( JNIEnv* env, jclass cls, jlong hwndParent, jint messageType, jstring primaryText, jstring secondaryText,
+		jint defaultButton, jobjectArray buttons )
+{
+	GtkWindow* window = (GtkWindow*) hwndParent;
+
+	// convert message type
+	GtkMessageType gmessageType;
+	switch( messageType ) {
+		case /* JOptionPane.ERROR_MESSAGE */       0: gmessageType = GTK_MESSAGE_ERROR; break;
+		case /* JOptionPane.INFORMATION_MESSAGE */ 1: gmessageType = GTK_MESSAGE_INFO; break;
+		case /* JOptionPane.WARNING_MESSAGE */     2: gmessageType = GTK_MESSAGE_WARNING; break;
+		case /* JOptionPane.QUESTION_MESSAGE */    3: gmessageType = GTK_MESSAGE_QUESTION; break;
+		default:
+		case /* JOptionPane.PLAIN_MESSAGE */      -1: gmessageType = GTK_MESSAGE_OTHER; break;
+	}
+
+	// convert Java strings to C strings
+	AutoReleaseStringUTF8 cprimaryText( env, primaryText );
+	AutoReleaseStringUTF8 csecondaryText( env, secondaryText );
+
+	// create GTK file chooser dialog
+	// https://docs.gtk.org/gtk3/class.MessageDialog.html
+	jint buttonCount = env->GetArrayLength( buttons );
+	GtkWidget* dialog = gtk_message_dialog_new( window, GTK_DIALOG_MODAL, gmessageType,
+		(buttonCount > 0) ? GTK_BUTTONS_NONE : GTK_BUTTONS_OK,
+		"%s", (const gchar*) cprimaryText );
+	if( csecondaryText != NULL )
+		gtk_message_dialog_format_secondary_text( GTK_MESSAGE_DIALOG( dialog ), "%s", (const gchar*) csecondaryText );
+
+	// add buttons
+	for( int i = 0; i < buttonCount; i++ ) {
+		AutoReleaseStringUTF8 str( env, (jstring) env->GetObjectArrayElement( buttons, i ) );
+		gtk_dialog_add_button( GTK_DIALOG( dialog ), str, i );
+	}
+
+	// set default button
+	gtk_dialog_set_default_response( GTK_DIALOG( dialog ), MIN( MAX( defaultButton, 0 ), buttonCount - 1 ) );
+
+	// show message dialog
+	gint responseID = gtk_dialog_run( GTK_DIALOG( dialog ) );
+	gtk_widget_destroy( dialog );
+
+	// return -1 if closed with ESC key
+	return (responseID >= 0) ? responseID : -1;
+}

flatlaf-natives/flatlaf-natives-linux/src/main/cpp/JNIUtils.cpp

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2024 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.
+ */
+
+// avoid inlining of printf()
+#define _NO_CRT_STDIO_INLINE
+
+#include <dlfcn.h>
+#include "JNIUtils.h"
+
+/**
+ * @author Karl Tauber
+ */
+
+//---- class AutoReleaseStringUTF8 --------------------------------------------
+
+AutoReleaseStringUTF8::AutoReleaseStringUTF8( JNIEnv* _env, jstring _javaString ) {
+	env = _env;
+	javaString = _javaString;
+	chars = (javaString != NULL) ? env->GetStringUTFChars( javaString, NULL ) : NULL;
+}
+
+AutoReleaseStringUTF8::~AutoReleaseStringUTF8() {
+	if( chars != NULL )
+		env->ReleaseStringUTFChars( javaString, chars );
+}
+
+//---- JNI methods ------------------------------------------------------------
+
+extern "C"
+JNIEXPORT jboolean JNICALL Java_com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_isLibAvailable
+	( JNIEnv* env, jclass cls, jstring libname )
+{
+	AutoReleaseStringUTF8 clibname( env, libname );
+
+	void* lib = dlopen( clibname, RTLD_LAZY );
+	if( lib == NULL )
+		return false;
+
+	dlclose( lib );
+	return true;
+}

flatlaf-natives/flatlaf-natives-linux/src/main/cpp/X11WmUtils.cpp

@@ -25,18 +25,21 @@
  */
 
 
-bool sendEvent( JNIEnv *env, jobject window, const char *atom_name,
+// declare exported methods
-	long data0, long data1, long data2, long data3, long data4 );
-bool isWMHintSupported( Display* display, Window rootWindow, Atom atom );
 Window getWindowHandle( JNIEnv* env, JAWT* awt, jobject window, Display** display_return );
 
+// declare internal methods
+static bool sendEvent( JNIEnv *env, jobject window, const char *atom_name,
+	long data0, long data1, long data2, long data3, long data4 );
+static bool isWMHintSupported( Display* display, Window rootWindow, Atom atom );
+
 
 //---- JNI methods ------------------------------------------------------------
 
 /**
  * Send _NET_WM_MOVERESIZE to window to initiate moving or resizing.
  *
- * https://specifications.freedesktop.org/wm-spec/wm-spec-latest.html#idm45446104441728
+ * https://specifications.freedesktop.org/wm-spec/latest/ar01s04.html#id-1.5.4
  * https://gitlab.gnome.org/GNOME/gtk/-/blob/main/gdk/x11/gdksurface-x11.c#L3841-3881
  */
 extern "C"
@@ -79,7 +82,7 @@ JNIEXPORT jboolean JNICALL Java_com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_xS
 		0 );
 }
 
-bool sendEvent( JNIEnv *env, jobject window, const char *atom_name,
+static bool sendEvent( JNIEnv *env, jobject window, const char *atom_name,
 	long data0, long data1, long data2, long data3, long data4 )
 {
 	// get the AWT
@@ -131,7 +134,7 @@ bool sendEvent( JNIEnv *env, jobject window, const char *atom_name,
 }
 
 
-bool isWMHintSupported( Display* display, Window rootWindow, Atom atom ) {
+static bool isWMHintSupported( Display* display, Window rootWindow, Atom atom ) {
 	Atom type;
 	int format;
 	unsigned long n_atoms;

flatlaf-natives/flatlaf-natives-linux/src/main/headers/JNIUtils.h

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2025 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.
+ */
+
+#include <gtk/gtk.h>
+#include <jni.h>
+
+/**
+ * @author Karl Tauber
+ */
+
+//---- class AutoReleaseStringUTF8 --------------------------------------------
+
+class AutoReleaseStringUTF8 {
+	JNIEnv* env;
+	jstring javaString;
+	const char* chars;
+
+public:
+	AutoReleaseStringUTF8( JNIEnv* _env, jstring _javaString );
+	~AutoReleaseStringUTF8();
+
+	operator const gchar*() { return chars; }
+};

flatlaf-natives/flatlaf-natives-linux/src/main/headers/com_formdev_flatlaf_ui_FlatNativeLinuxLibrary.h

@@ -9,6 +9,18 @@ extern "C" {
 #endif
 #undef com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_MOVE
 #define com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_MOVE 8L
+#undef com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_FC_select_folder
+#define com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_FC_select_folder 1L
+#undef com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_FC_select_multiple
+#define com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_FC_select_multiple 2L
+#undef com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_FC_show_hidden
+#define com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_FC_show_hidden 4L
+#undef com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_FC_local_only
+#define com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_FC_local_only 8L
+#undef com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_FC_do_overwrite_confirmation
+#define com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_FC_do_overwrite_confirmation 16L
+#undef com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_FC_create_folders
+#define com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_FC_create_folders 32L
 /*
  * Class:     com_formdev_flatlaf_ui_FlatNativeLinuxLibrary
  * Method:    xMoveOrResizeWindow
@@ -25,6 +37,30 @@ JNIEXPORT jboolean JNICALL Java_com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_xM
 JNIEXPORT jboolean JNICALL Java_com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_xShowWindowMenu
   (JNIEnv *, jclass, jobject, jint, jint);
 
+/*
+ * Class:     com_formdev_flatlaf_ui_FlatNativeLinuxLibrary
+ * Method:    isLibAvailable
+ * Signature: (Ljava/lang/String;)Z
+ */
+JNIEXPORT jboolean JNICALL Java_com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_isLibAvailable
+  (JNIEnv *, jclass, jstring);
+
+/*
+ * Class:     com_formdev_flatlaf_ui_FlatNativeLinuxLibrary
+ * Method:    showFileChooser
+ * Signature: (Ljava/awt/Window;ZLjava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;IILcom/formdev/flatlaf/ui/FlatNativeLinuxLibrary/FileChooserCallback;I[Ljava/lang/String;)[Ljava/lang/String;
+ */
+JNIEXPORT jobjectArray JNICALL Java_com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_showFileChooser
+  (JNIEnv *, jclass, jobject, jboolean, jstring, jstring, jstring, jstring, jint, jint, jobject, jint, jobjectArray);
+
+/*
+ * Class:     com_formdev_flatlaf_ui_FlatNativeLinuxLibrary
+ * Method:    showMessageDialog
+ * Signature: (JILjava/lang/String;Ljava/lang/String;I[Ljava/lang/String;)I
+ */
+JNIEXPORT jint JNICALL Java_com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_showMessageDialog
+  (JNIEnv *, jclass, jlong, jint, jstring, jstring, jint, jobjectArray);
+
 #ifdef __cplusplus
 }
 #endif

flatlaf-natives/flatlaf-natives-macos/build.gradle.kts

@@ -75,7 +75,7 @@ tasks {
 
 		compilerArgs.addAll( toolChain.map {
 			when( it ) {
-				is Gcc, is Clang -> listOf( "-x", "objective-c++", "-mmacosx-version-min=$minOs" )
+				is Gcc, is Clang -> listOf( "-x", "objective-c++", "-mmacosx-version-min=$minOs", "-fvisibility=hidden" )
 				else -> emptyList()
 			}
 		} )

flatlaf-natives/flatlaf-natives-macos/src/main/headers/JNIUtils.h

@@ -46,7 +46,33 @@
 		JNI_COCOA_CATCH() \
 	}
 
+#define JNI_THREAD_ENTER( jvm, returnValue ) \
+	JNIEnv *env; \
+	bool detach = false; \
+	switch( jvm->GetEnv( (void**) &env, JNI_VERSION_1_6 ) ) { \
+		case JNI_OK: break; \
+		case JNI_EDETACHED: \
+			if( jvm->AttachCurrentThread( (void**) &env, NULL ) != JNI_OK ) \
+				return returnValue; \
+			detach = true; \
+			break; \
+		default: return returnValue; \
+	} \
+	@try {
+
+#define JNI_THREAD_EXIT( jvm ) \
+	} @finally { \
+		if( env->ExceptionCheck() ) \
+			env->ExceptionDescribe(); \
+		if( detach ) \
+			jvm->DetachCurrentThread(); \
+	}
+
 
 jclass findClass( JNIEnv *env, const char* className, bool globalRef );
 jfieldID getFieldID( JNIEnv *env, jclass cls, const char* fieldName, const char* fieldSignature, bool staticField );
 jmethodID getMethodID( JNIEnv *env, jclass cls, const char* methodName, const char* methodSignature, bool staticMethod );
+
+NSString* JavaToNSString( JNIEnv *env, jstring javaString );
+jstring NSToJavaString( JNIEnv *env, NSString *nsString );
+jstring NormalizedPathJavaFromNSString( JNIEnv* env, NSString *nsString );

flatlaf-natives/flatlaf-natives-macos/src/main/headers/com_formdev_flatlaf_ui_FlatNativeMacLibrary.h

@@ -13,6 +13,32 @@ extern "C" {
 #define com_formdev_flatlaf_ui_FlatNativeMacLibrary_BUTTONS_SPACING_MEDIUM 1L
 #undef com_formdev_flatlaf_ui_FlatNativeMacLibrary_BUTTONS_SPACING_LARGE
 #define com_formdev_flatlaf_ui_FlatNativeMacLibrary_BUTTONS_SPACING_LARGE 2L
+#undef com_formdev_flatlaf_ui_FlatNativeMacLibrary_FC_canChooseFiles
+#define com_formdev_flatlaf_ui_FlatNativeMacLibrary_FC_canChooseFiles 1L
+#undef com_formdev_flatlaf_ui_FlatNativeMacLibrary_FC_canChooseDirectories
+#define com_formdev_flatlaf_ui_FlatNativeMacLibrary_FC_canChooseDirectories 2L
+#undef com_formdev_flatlaf_ui_FlatNativeMacLibrary_FC_resolvesAliases
+#define com_formdev_flatlaf_ui_FlatNativeMacLibrary_FC_resolvesAliases 4L
+#undef com_formdev_flatlaf_ui_FlatNativeMacLibrary_FC_allowsMultipleSelection
+#define com_formdev_flatlaf_ui_FlatNativeMacLibrary_FC_allowsMultipleSelection 8L
+#undef com_formdev_flatlaf_ui_FlatNativeMacLibrary_FC_accessoryViewDisclosed
+#define com_formdev_flatlaf_ui_FlatNativeMacLibrary_FC_accessoryViewDisclosed 16L
+#undef com_formdev_flatlaf_ui_FlatNativeMacLibrary_FC_showsTagField
+#define com_formdev_flatlaf_ui_FlatNativeMacLibrary_FC_showsTagField 256L
+#undef com_formdev_flatlaf_ui_FlatNativeMacLibrary_FC_canCreateDirectories
+#define com_formdev_flatlaf_ui_FlatNativeMacLibrary_FC_canCreateDirectories 512L
+#undef com_formdev_flatlaf_ui_FlatNativeMacLibrary_FC_canSelectHiddenExtension
+#define com_formdev_flatlaf_ui_FlatNativeMacLibrary_FC_canSelectHiddenExtension 1024L
+#undef com_formdev_flatlaf_ui_FlatNativeMacLibrary_FC_showsHiddenFiles
+#define com_formdev_flatlaf_ui_FlatNativeMacLibrary_FC_showsHiddenFiles 2048L
+#undef com_formdev_flatlaf_ui_FlatNativeMacLibrary_FC_extensionHidden
+#define com_formdev_flatlaf_ui_FlatNativeMacLibrary_FC_extensionHidden 4096L
+#undef com_formdev_flatlaf_ui_FlatNativeMacLibrary_FC_allowsOtherFileTypes
+#define com_formdev_flatlaf_ui_FlatNativeMacLibrary_FC_allowsOtherFileTypes 8192L
+#undef com_formdev_flatlaf_ui_FlatNativeMacLibrary_FC_treatsFilePackagesAsDirectories
+#define com_formdev_flatlaf_ui_FlatNativeMacLibrary_FC_treatsFilePackagesAsDirectories 16384L
+#undef com_formdev_flatlaf_ui_FlatNativeMacLibrary_FC_showSingleFilterField
+#define com_formdev_flatlaf_ui_FlatNativeMacLibrary_FC_showSingleFilterField 16777216L
 /*
  * Class:     com_formdev_flatlaf_ui_FlatNativeMacLibrary
  * Method:    setWindowRoundedBorder
@@ -53,6 +79,22 @@ JNIEXPORT jboolean JNICALL Java_com_formdev_flatlaf_ui_FlatNativeMacLibrary_isWi
 JNIEXPORT jboolean JNICALL Java_com_formdev_flatlaf_ui_FlatNativeMacLibrary_toggleWindowFullScreen
   (JNIEnv *, jclass, jobject);
 
+/*
+ * Class:     com_formdev_flatlaf_ui_FlatNativeMacLibrary
+ * Method:    showFileChooser
+ * Signature: (Ljava/awt/Window;IZLjava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;IILcom/formdev/flatlaf/ui/FlatNativeMacLibrary/FileChooserCallback;I[Ljava/lang/String;)[Ljava/lang/String;
+ */
+JNIEXPORT jobjectArray JNICALL Java_com_formdev_flatlaf_ui_FlatNativeMacLibrary_showFileChooser
+  (JNIEnv *, jclass, jobject, jint, jboolean, jstring, jstring, jstring, jstring, jstring, jstring, jstring, jint, jint, jobject, jint, jobjectArray);
+
+/*
+ * Class:     com_formdev_flatlaf_ui_FlatNativeMacLibrary
+ * Method:    showMessageDialog
+ * Signature: (JILjava/lang/String;Ljava/lang/String;I[Ljava/lang/String;)I
+ */
+JNIEXPORT jint JNICALL Java_com_formdev_flatlaf_ui_FlatNativeMacLibrary_showMessageDialog
+  (JNIEnv *, jclass, jlong, jint, jstring, jstring, jint, jobjectArray);
+
 #ifdef __cplusplus
 }
 #endif

flatlaf-natives/flatlaf-natives-macos/src/main/objcpp/ApiVersion.mm

@@ -14,8 +14,8 @@
  * limitations under the License.
  */
 
-#include <jni.h>
+#import <jni.h>
-#include "com_formdev_flatlaf_ui_FlatNativeLibrary.h"
+#import "com_formdev_flatlaf_ui_FlatNativeLibrary.h"
 
 /**
  * @author Karl Tauber
@@ -24,7 +24,7 @@
 
 // increase this version if changing API or functionality of native library
 // also update version in Java class com.formdev.flatlaf.ui.FlatNativeMacLibrary
-#define API_VERSION_MACOS		2001
+#define API_VERSION_MACOS		2002
 
 
 //---- JNI methods ------------------------------------------------------------

flatlaf-natives/flatlaf-natives-macos/src/main/objcpp/JNIUtils.mm

@@ -75,3 +75,38 @@ jmethodID getMethodID( JNIEnv *env, jclass cls, const char* methodName, const ch
 
 	return methodID;
 }
+
+NSString* JavaToNSString( JNIEnv *env, jstring javaString ) {
+	if( javaString == NULL )
+		return NULL;
+
+	int len = env->GetStringLength( javaString );
+	const jchar* chars = env->GetStringChars( javaString, NULL );
+	if( chars == NULL )
+		return NULL;
+
+	NSString* nsString = [NSString stringWithCharacters:(unichar*)chars length:len];
+	env->ReleaseStringChars( javaString, chars );
+	return nsString;
+}
+
+jstring NSToJavaString( JNIEnv *env, NSString *nsString ) {
+	if( nsString == NULL )
+		return NULL;
+
+	jsize len = [nsString length];
+	unichar* buffer = (unichar*) calloc( len, sizeof( unichar ) );
+	if( buffer == NULL )
+		return NULL;
+
+	[nsString getCharacters:buffer];
+	jstring javaString = env->NewString( buffer, len );
+	free( buffer );
+	return javaString;
+}
+
+jstring NormalizedPathJavaFromNSString( JNIEnv* env, NSString *nsString ) {
+	return (nsString != NULL)
+		? NSToJavaString( env, [nsString precomposedStringWithCanonicalMapping] )
+		: NULL;
+}

flatlaf-natives/flatlaf-natives-macos/src/main/objcpp/MacFileChooser.mm

@@ -0,0 +1,406 @@
+/*
+ * Copyright 2024 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 <Cocoa/Cocoa.h>
+#import <objc/runtime.h>
+#import <jni.h>
+#import "JNIUtils.h"
+#import "JNFRunLoop.h"
+#import "com_formdev_flatlaf_ui_FlatNativeMacLibrary.h"
+
+/**
+ * @author Karl Tauber
+ * @since 3.7
+ */
+
+// declare internal methods
+static jobjectArray newJavaStringArray( JNIEnv* env, jsize count );
+static jobjectArray urlsToStringArray( JNIEnv* env, NSArray* urls );
+static NSArray* getDialogURLs( NSSavePanel* dialog );
+
+//---- class FileChooserDelegate ----------------------------------------------
+
+@interface FileChooserDelegate : NSObject <NSOpenSavePanelDelegate, NSWindowDelegate> {
+		NSArray* _filters;
+
+		JavaVM* _jvm;
+		jobject _callback;
+		NSMutableSet* _urlsSet;
+	}
+
+	@property (nonatomic, assign) NSSavePanel* dialog;
+
+	- (void) initFilterAccessoryView: (NSMutableArray*)filters :(int)filterIndex
+		:(NSString*)filterFieldLabel :(bool)showSingleFilterField;
+	- (void) selectFormat: (id)sender;
+	- (void) selectFormatAtIndex: (int)index;
+@end
+
+@implementation FileChooserDelegate
+
+	- (void) initFilterAccessoryView: (NSMutableArray*)filters :(int)filterIndex
+		:(NSString*)filterFieldLabel :(bool)showSingleFilterField
+	{
+		_filters = filters;
+
+		// get filter names
+		NSArray* filterNames = filters.lastObject;
+		[filters removeLastObject];
+
+		// do not add filter/format combobox if there is only one filter
+		if( filters.count <= 1 && !showSingleFilterField ) {
+			[self selectFormatAtIndex:0];
+			return;
+		}
+
+		// create label
+		NSTextField* label = [[NSTextField alloc] initWithFrame:NSZeroRect];
+		label.stringValue = (filterFieldLabel != NULL) ? filterFieldLabel : @"Format:";
+		label.editable = NO;
+		label.bordered = NO;
+		label.bezeled = NO;
+		label.drawsBackground = NO;
+
+		// create combobox
+		NSPopUpButton* popupButton = [[NSPopUpButton alloc] initWithFrame:NSZeroRect pullsDown:NO];
+		[popupButton addItemsWithTitles:filterNames];
+		[popupButton selectItemAtIndex:MIN( MAX( filterIndex, 0 ), filterNames.count - 1 )];
+		[popupButton setTarget:self];
+		[popupButton setAction:@selector(selectFormat:)];
+
+		// create view
+		NSView* accessoryView = [[NSView alloc] initWithFrame:NSZeroRect];
+		[accessoryView addSubview:label];
+		[accessoryView addSubview:popupButton];
+
+		// autolayout
+		label.translatesAutoresizingMaskIntoConstraints = NO;
+		popupButton.translatesAutoresizingMaskIntoConstraints = NO;
+		int labelWidth = label.intrinsicContentSize.width;
+		int gap = 12;
+		int popupButtonWidth = popupButton.intrinsicContentSize.width;
+		int popupButtonMinimumWidth = 140;
+		int totalWidth = labelWidth + gap + MAX( popupButtonWidth, popupButtonMinimumWidth );
+		[accessoryView addConstraints:@[
+			// horizontal layout
+			[label.leadingAnchor constraintEqualToAnchor:accessoryView.centerXAnchor constant:-(totalWidth / 2)],
+			[popupButton.leadingAnchor constraintEqualToAnchor:label.trailingAnchor constant:gap],
+			[popupButton.widthAnchor constraintGreaterThanOrEqualToConstant:popupButtonMinimumWidth],
+
+			// vertical layout
+			[popupButton.topAnchor constraintEqualToAnchor:accessoryView.topAnchor constant:8],
+			[popupButton.bottomAnchor constraintEqualToAnchor:accessoryView.bottomAnchor constant:-8],
+			[label.firstBaselineAnchor constraintEqualToAnchor:popupButton.firstBaselineAnchor],
+		]];
+
+		[_dialog setAccessoryView:accessoryView];
+
+		// initial filter
+		[self selectFormatAtIndex:filterIndex];
+	}
+
+	- (void) selectFormat: (id)sender {
+		NSPopUpButton* popupButton = (NSPopUpButton*) sender;
+		[self selectFormatAtIndex:popupButton.indexOfSelectedItem];
+	}
+
+	- (void) selectFormatAtIndex: (int)index {
+		index = MIN( MAX( index, 0 ), _filters.count - 1 );
+		NSArray* fileTypes = [_filters objectAtIndex:index];
+
+		// use deprecated allowedFileTypes instead of newer allowedContentTypes (since macOS 11+)
+		// to support older macOS versions 10.14+ and because of some problems with allowedContentTypes:
+		// https://github.com/chromium/chromium/blob/d8e0032963b7ca4728ff4117933c0feb3e479b7a/components/remote_cocoa/app_shim/select_file_dialog_bridge.mm#L209-232
+		_dialog.allowedFileTypes = [fileTypes containsObject:@"*"] ? nil : fileTypes;
+	}
+
+	//---- NSOpenSavePanelDelegate ----
+
+	- (void) initCallback: (JavaVM*)jvm :(jobject)callback {
+		_jvm = jvm;
+		_callback = callback;
+	}
+
+	- (BOOL) panel: (id) sender validateURL:(NSURL*) url error:(NSError**) outError {
+		JNI_COCOA_TRY()
+
+		if( _callback == NULL )
+			return true;
+
+		NSArray* urls = getDialogURLs( sender );
+
+		// if multiple files are selected for opening, then the validateURL method
+		// is invoked for earch file, but our callback should be invoked only once for all files
+		if( urls != NULL && urls.count > 1 ) {
+			if( _urlsSet == NULL ) {
+				// invoked for first selected file --> invoke callback
+				_urlsSet = [NSMutableSet setWithArray:urls];
+				[_urlsSet removeObject:url];
+			} else {
+				// invoked for other selected files --> do not invoke callback
+				[_urlsSet removeObject:url];
+				if( _urlsSet.count == 0 )
+					_urlsSet = NULL;
+				return true;
+			}
+		}
+
+		JNI_THREAD_ENTER( _jvm, true )
+
+		jobjectArray files = urlsToStringArray( env, urls );
+		jlong window = (jlong) sender;
+
+		// invoke callback: boolean approve( String[] files, long hwnd );
+		jclass cls = env->GetObjectClass( _callback );
+		jmethodID approveID = env->GetMethodID( cls, "approve", "([Ljava/lang/String;J)Z" );
+		if( approveID != NULL && !env->CallBooleanMethod( _callback, approveID, files, window ) ) {
+			_urlsSet = NULL;
+			return false; // keep dialog open
+		}
+
+		JNI_THREAD_EXIT( _jvm )
+		JNI_COCOA_CATCH()
+
+		return true;
+	}
+
+	//---- NSWindowDelegate ----
+
+	- (void) windowDidBecomeMain:(NSNotification *) notification {
+		JNI_COCOA_TRY()
+
+		// Disable main menu bar because the file dialog is modal and it should be not possible
+		// to select any menu item. Otherwiese an action could show a Swing dialog, which would
+		// be shown under the file dialog.
+		//
+		// NOTE: It is not necessary to re-enable the main menu bar because Swing does this itself.
+		//       When the file dialog is closed and a Swing window becomes active,
+		//       macOS sends windowDidBecomeMain (and windowDidBecomeKey) message to AWTWindow,
+		//       which invokes [self activateWindowMenuBar],
+		//       which invokes [CMenuBar activate:menuBar modallyDisabled:isDisabled],
+		//       which updates main menu bar.
+		NSMenu* mainMenu = [NSApp mainMenu];
+		int count = [mainMenu numberOfItems];
+		for( int i = 0; i < count; i++ ) {
+			NSMenuItem* menuItem = [mainMenu itemAtIndex:i];
+			NSMenu *subenu = [menuItem submenu];
+			if( [subenu isJavaMenu] )
+				[menuItem setEnabled:NO];
+		}
+
+		JNI_COCOA_CATCH()
+	}
+
+@end
+
+//---- helper -----------------------------------------------------------------
+
+#define isOptionSet( option ) ((optionsSet & com_formdev_flatlaf_ui_FlatNativeMacLibrary_ ## option) != 0)
+#define isOptionClear( option ) ((optionsClear & com_formdev_flatlaf_ui_FlatNativeMacLibrary_ ## option) != 0)
+#define isOptionSetOrClear( option ) isOptionSet( option ) || isOptionClear( option )
+
+static jobjectArray newJavaStringArray( JNIEnv* env, jsize count ) {
+	jclass stringClass = env->FindClass( "java/lang/String" );
+	return env->NewObjectArray( count, stringClass, NULL );
+}
+
+static NSMutableArray* initFilters( JNIEnv* env, jobjectArray fileTypes ) {
+	jint length = env->GetArrayLength( fileTypes );
+	if( length <= 0 )
+		return NULL;
+
+	NSMutableArray* filterNames = [NSMutableArray array];
+	NSMutableArray* filters = [NSMutableArray array];
+	NSString* filterName = NULL;
+	NSMutableArray* filter = NULL;
+	for( int i = 0; i < length; i++ ) {
+		jstring jstr = (jstring) env->GetObjectArrayElement( fileTypes, i );
+		if( jstr == NULL ) {
+			if( filter != NULL ) {
+				if( filter.count > 0 ) {
+					[filterNames addObject:filterName];
+					[filters addObject:filter];
+				}
+				filterName = NULL;
+				filter = NULL;
+			}
+			continue;
+		}
+
+		NSString* str = JavaToNSString( env, jstr );
+		env->DeleteLocalRef( jstr );
+		if( filter == NULL ) {
+			filterName = str;
+			filter = [NSMutableArray array];
+		} else
+			[filter addObject:str];
+	}
+
+	if( filters.count == 0 )
+		return NULL;
+
+	// add filter names to array (removed again after creating combobox)
+	[filters addObject:filterNames];
+
+	return filters;
+}
+
+//---- JNI methods ------------------------------------------------------------
+
+extern "C"
+JNIEXPORT jobjectArray JNICALL Java_com_formdev_flatlaf_ui_FlatNativeMacLibrary_showFileChooser
+	( JNIEnv* env, jclass cls, jobject owner, jint dark, jboolean open,
+		jstring title, jstring prompt, jstring message, jstring filterFieldLabel,
+		jstring nameFieldLabel, jstring nameFieldStringValue, jstring directoryURL,
+		jint optionsSet, jint optionsClear, jobject callback, jint fileTypeIndex, jobjectArray fileTypes )
+{
+	JNI_COCOA_ENTER()
+
+	JavaVM* jvm;
+	if( env->GetJavaVM( &jvm ) != JNI_OK )
+		return NULL;
+
+	// convert Java strings to NSString (on Java thread)
+	NSString* nsTitle = JavaToNSString( env, title );
+	NSString* nsPrompt = JavaToNSString( env, prompt );
+	NSString* nsMessage = JavaToNSString( env, message );
+	NSString* nsFilterFieldLabel = JavaToNSString( env, filterFieldLabel );
+	NSString* nsNameFieldLabel = JavaToNSString( env, nameFieldLabel );
+	NSString* nsNameFieldStringValue = JavaToNSString( env, nameFieldStringValue );
+	NSString* nsDirectoryURL = JavaToNSString( env, directoryURL );
+	NSMutableArray* filters = initFilters( env, fileTypes );
+
+	NSArray* urls = NULL;
+	NSArray** purls = &urls;
+
+	// show file dialog on macOS thread
+	[FlatJNFRunLoop performOnMainThreadWaiting:YES withBlock:^(){
+		JNI_COCOA_TRY()
+
+		// create open/save panel
+		NSSavePanel* dialog = open ? [NSOpenPanel openPanel] : [NSSavePanel savePanel];
+
+		// set appearance
+		if( dark == 1 )
+			dialog.appearance = [NSAppearance appearanceNamed:NSAppearanceNameDarkAqua];
+		else if( dark == 0 )
+			dialog.appearance = [NSAppearance appearanceNamed:NSAppearanceNameAqua];
+
+		if( nsTitle != NULL )
+			dialog.title = nsTitle;
+		if( nsPrompt != NULL )
+			dialog.prompt = nsPrompt;
+		if( nsMessage != NULL )
+			dialog.message = nsMessage;
+		if( nsNameFieldLabel != NULL )
+			dialog.nameFieldLabel = nsNameFieldLabel;
+		if( nsNameFieldStringValue != NULL )
+			dialog.nameFieldStringValue = nsNameFieldStringValue;
+		if( nsDirectoryURL != NULL )
+			dialog.directoryURL = [NSURL fileURLWithPath:nsDirectoryURL isDirectory:YES];
+
+		// set open options
+		if( open ) {
+			NSOpenPanel* openDialog = (NSOpenPanel*) dialog;
+
+			bool canChooseFiles = isOptionSet( FC_canChooseFiles );
+			bool canChooseDirectories = isOptionSet( FC_canChooseDirectories );
+			if( !canChooseFiles && !canChooseDirectories )
+				canChooseFiles = true;
+			openDialog.canChooseFiles = canChooseFiles;
+			openDialog.canChooseDirectories = canChooseDirectories;
+
+			if( isOptionSetOrClear( FC_resolvesAliases ) )
+				openDialog.resolvesAliases = isOptionSet( FC_resolvesAliases );
+			if( isOptionSetOrClear( FC_allowsMultipleSelection ) )
+				openDialog.allowsMultipleSelection = isOptionSet( FC_allowsMultipleSelection );
+		}
+
+		// set options
+		if( isOptionSetOrClear( FC_showsTagField ) )
+			dialog.showsTagField = isOptionSet( FC_showsTagField );
+		if( isOptionSetOrClear( FC_canCreateDirectories ) )
+			dialog.canCreateDirectories = isOptionSet( FC_canCreateDirectories );
+		if( isOptionSetOrClear( FC_canSelectHiddenExtension ) )
+			dialog.canSelectHiddenExtension = isOptionSet( FC_canSelectHiddenExtension );
+		if( isOptionSetOrClear( FC_showsHiddenFiles) )
+			dialog.showsHiddenFiles = isOptionSet( FC_showsHiddenFiles);
+		if( isOptionSetOrClear( FC_extensionHidden ) )
+			dialog.extensionHidden = isOptionSet( FC_extensionHidden );
+		if( isOptionSetOrClear( FC_allowsOtherFileTypes ) )
+			dialog.allowsOtherFileTypes = isOptionSet( FC_allowsOtherFileTypes );
+		if( isOptionSetOrClear( FC_treatsFilePackagesAsDirectories ) )
+			dialog.treatsFilePackagesAsDirectories = isOptionSet( FC_treatsFilePackagesAsDirectories );
+
+		FileChooserDelegate* delegate = [FileChooserDelegate new];
+		delegate.dialog = dialog;
+
+		// initialize filter accessory view
+		if( filters != NULL ) {
+			[delegate initFilterAccessoryView:filters :fileTypeIndex :nsFilterFieldLabel :isOptionSet( FC_showSingleFilterField )];
+
+			if( open && isOptionSetOrClear( FC_accessoryViewDisclosed ) )
+				((NSOpenPanel*)dialog).accessoryViewDisclosed = isOptionSet( FC_accessoryViewDisclosed );
+		}
+
+		// initialize callback
+		if( callback != NULL )
+			[delegate initCallback :jvm :callback];
+
+		// set file dialog delegate
+		dialog.delegate = delegate;
+
+		// show dialog
+		NSModalResponse response = [dialog runModal];
+		[delegate release];
+		if( response != NSModalResponseOK ) {
+			*purls = @[];
+			return;
+		}
+
+		*purls = getDialogURLs( dialog );
+
+		JNI_COCOA_CATCH()
+	}];
+
+	if( urls == NULL )
+		return NULL;
+
+	// convert URLs to Java string array
+	return urlsToStringArray( env, urls );
+
+	JNI_COCOA_EXIT()
+}
+
+static NSArray* getDialogURLs( NSSavePanel* dialog ) {
+	if( [dialog isKindOfClass:[NSOpenPanel class]] )
+		return [[NSArray alloc] initWithArray: static_cast<NSOpenPanel*>(dialog).URLs];
+
+	NSURL* url = dialog.URL;
+	// use '[[NSArray alloc] initWithObject:url]' here because '@[url]' crashes on macOS 10.14
+	return (url != NULL) ? [[NSArray alloc] initWithObject:url] : @[];
+}
+
+static jobjectArray urlsToStringArray( JNIEnv* env, NSArray* urls ) {
+	jsize count = (urls != NULL) ? urls.count : 0;
+	jobjectArray array = newJavaStringArray( env, count );
+	for( int i = 0; i < count; i++ ) {
+		jstring filename = NormalizedPathJavaFromNSString( env, [urls[i] path] );
+		env->SetObjectArrayElement( array, i, filename );
+		env->DeleteLocalRef( filename );
+	}
+	return array;
+}

flatlaf-natives/flatlaf-natives-macos/src/main/objcpp/MacMessageDialog.mm

@@ -0,0 +1,90 @@
+/*
+ * Copyright 2024 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 <Cocoa/Cocoa.h>
+#import <objc/runtime.h>
+#import <jni.h>
+#import "JNIUtils.h"
+#import "JNFRunLoop.h"
+#import "com_formdev_flatlaf_ui_FlatNativeMacLibrary.h"
+
+/**
+ * @author Karl Tauber
+ * @since 3.7
+ */
+
+extern "C"
+JNIEXPORT jint JNICALL Java_com_formdev_flatlaf_ui_FlatNativeMacLibrary_showMessageDialog
+	( JNIEnv* env, jclass cls, jlong hwndParent, jint alertStyle, jstring messageText, jstring informativeText,
+		jint defaultButton, jobjectArray buttons )
+{
+	JNI_COCOA_ENTER()
+
+	// convert Java strings to NSString (on Java thread)
+	NSString* nsMessageText = JavaToNSString( env, messageText );
+	NSString* nsInformativeText = JavaToNSString( env, informativeText );
+
+	jint buttonCount = env->GetArrayLength( buttons );
+	NSMutableArray* nsButtons = [NSMutableArray array];
+	for( int i = 0; i < buttonCount; i++ ) {
+		NSString* nsButton = JavaToNSString( env, (jstring) env->GetObjectArrayElement( buttons, i ) );
+		[nsButtons addObject:nsButton];
+	}
+
+	jint result = -1;
+	jint* presult = &result;
+
+	// show alert on macOS thread
+	[FlatJNFRunLoop performOnMainThreadWaiting:YES withBlock:^(){
+		NSAlert* alert = [[NSAlert alloc] init];
+
+		// use appearance from parent window
+		NSWindow* parent = (NSWindow*) hwndParent;
+		if( parent != NULL )
+			alert.window.appearance = parent.appearance;
+
+		// use empty string because if alert.messageText is not set it displays "Alert"
+		alert.messageText = (nsMessageText != NULL) ? nsMessageText : @"";
+		if( nsInformativeText != NULL )
+			alert.informativeText = nsInformativeText;
+
+		// alert style
+		switch( alertStyle ) {
+			case /* JOptionPane.ERROR_MESSAGE */       0: alert.alertStyle = NSAlertStyleCritical; break;
+			default:
+			case /* JOptionPane.INFORMATION_MESSAGE */ 1: alert.alertStyle = NSAlertStyleInformational; break;
+			case /* JOptionPane.WARNING_MESSAGE */     2: alert.alertStyle = NSAlertStyleWarning; break;
+		}
+
+		// add buttons
+		for( int i = 0; i < nsButtons.count; i++ ) {
+			NSButton* b = [alert addButtonWithTitle:nsButtons[i]];
+			if( i == defaultButton )
+				alert.window.defaultButtonCell = b.cell;
+		}
+
+		// show alert
+		NSInteger response = [alert runModal];
+
+		// if no buttons added, which shows a single OK button, the response is 0 when clicking OK
+		// if buttons added, response is 1000+buttonIndex
+		*presult = MAX( response - NSAlertFirstButtonReturn, 0 );
+	}];
+
+	return result;
+
+	JNI_COCOA_EXIT()
+}

flatlaf-natives/flatlaf-natives-macos/src/main/objcpp/MacWindow.mm

@@ -39,13 +39,15 @@
 @implementation WindowData
 @end
 
-// declare internal methods
+// declare exported methods
 NSWindow* getNSWindow( JNIEnv* env, jclass cls, jobject window );
-WindowData* getWindowData( NSWindow* nsWindow, bool allocate );
+
-void setWindowButtonsHidden( NSWindow* nsWindow, bool hidden );
+// declare internal methods
-int getWindowButtonAreaWidth( NSWindow* nsWindow );
+static WindowData* getWindowData( NSWindow* nsWindow, bool allocate );
-int getWindowTitleBarHeight( NSWindow* nsWindow );
+static void setWindowButtonsHidden( NSWindow* nsWindow, bool hidden );
-bool isWindowFullScreen( NSWindow* nsWindow );
+static int getWindowButtonAreaWidth( NSWindow* nsWindow );
+static int getWindowTitleBarHeight( NSWindow* nsWindow );
+static bool isWindowFullScreen( NSWindow* nsWindow );
 
 
 NSWindow* getNSWindow( JNIEnv* env, jclass cls, jobject window ) {
@@ -79,7 +81,7 @@ NSWindow* getNSWindow( JNIEnv* env, jclass cls, jobject window ) {
 	return (NSWindow *) jlong_to_ptr( env->GetLongField( platformWindow, ptrID ) );
 }
 
-WindowData* getWindowData( NSWindow* nsWindow, bool allocate ) {
+static WindowData* getWindowData( NSWindow* nsWindow, bool allocate ) {
 	static char key;
 	WindowData* windowData = objc_getAssociatedObject( nsWindow, &key );
 	if( windowData == NULL && allocate ) {
@@ -252,7 +254,7 @@ JNIEXPORT jboolean JNICALL Java_com_formdev_flatlaf_ui_FlatNativeMacLibrary_setW
 	return FALSE;
 }
 
-void setWindowButtonsHidden( NSWindow* nsWindow, bool hidden ) {
+static void setWindowButtonsHidden( NSWindow* nsWindow, bool hidden ) {
 	// get buttons
 	NSView* buttons[3] = {
 		[nsWindow standardWindowButton:NSWindowCloseButton],
@@ -312,7 +314,7 @@ JNIEXPORT jobject JNICALL Java_com_formdev_flatlaf_ui_FlatNativeMacLibrary_getWi
 	return NULL;
 }
 
-int getWindowButtonAreaWidth( NSWindow* nsWindow ) {
+static int getWindowButtonAreaWidth( NSWindow* nsWindow ) {
 	// get buttons
 	NSView* buttons[3] = {
 		[nsWindow standardWindowButton:NSWindowCloseButton],
@@ -344,7 +346,7 @@ int getWindowButtonAreaWidth( NSWindow* nsWindow ) {
 	return right + left;
 }
 
-int getWindowTitleBarHeight( NSWindow* nsWindow ) {
+static int getWindowTitleBarHeight( NSWindow* nsWindow ) {
 	NSView* closeButton = [nsWindow standardWindowButton:NSWindowCloseButton];
 	if( closeButton == NULL )
 		return -1;
@@ -369,7 +371,7 @@ JNIEXPORT jboolean JNICALL Java_com_formdev_flatlaf_ui_FlatNativeMacLibrary_isWi
 	return FALSE;
 }
 
-bool isWindowFullScreen( NSWindow* nsWindow ) {
+static bool isWindowFullScreen( NSWindow* nsWindow ) {
 	return ((nsWindow.styleMask & NSWindowStyleMaskFullScreen) != 0);
 }
 

flatlaf-natives/flatlaf-natives-windows/build.gradle.kts

@@ -64,7 +64,7 @@ tasks {
 		compilerArgs.addAll( toolChain.map {
 			when( it ) {
 				is Gcc, is Clang -> listOf( "-O2", "-DUNICODE" )
-				is VisualCpp -> listOf( "/O2", "/Zl", "/GS-", "/DUNICODE" )
+				is VisualCpp -> listOf( "/O2", "/GS-", "/DUNICODE" )
 				else -> emptyList()
 			}
 		} )
@@ -80,8 +80,8 @@ tasks {
 
 		linkerArgs.addAll( toolChain.map {
 			when( it ) {
-				is Gcc, is Clang -> listOf( "-lUser32", "-lGdi32", "-lshell32", "-lAdvAPI32", "-lKernel32", "-lDwmapi" )
+				is Gcc, is Clang -> listOf( "-lUser32", "-lGdi32", "-lshell32", "-lAdvAPI32", "-lKernel32", "-lDwmapi", "-lOle32", "-luuid" )
-				is VisualCpp -> listOf( "User32.lib", "Gdi32.lib", "shell32.lib", "AdvAPI32.lib", "Kernel32.lib", "Dwmapi.lib", "/NODEFAULTLIB" )
+				is VisualCpp -> listOf( "User32.lib", "Gdi32.lib", "shell32.lib", "AdvAPI32.lib", "Kernel32.lib", "Dwmapi.lib", "Ole32.lib", "uuid.lib" )
 				else -> emptyList()
 			}
 		} )
@@ -93,6 +93,15 @@ tasks {
 				into( nativesDir )
 				rename( linkedFile.get().asFile.name, libraryName )
 			}
+
+/*dump
+			val dumpbin = "C:/Program Files/Microsoft Visual Studio/2022/Community/VC/Tools/MSVC/14.42.34433/bin/Hostx64/x64/dumpbin.exe"
+			val dll = linkedFile.asFile.get()
+			val dllDir = dll.parent
+			exec { commandLine( dumpbin, "/all", "/rawdata:none", "/out:$dllDir/objdump.txt", dll ) }
+			exec { commandLine( dumpbin, "/all", "/out:$dllDir/full-contents.txt", dll ) }
+			exec { commandLine( dumpbin, "/disasm", "/out:$dllDir/disassemble.txt", dll ) }
+dump*/
 		}
 	}
 }

flatlaf-natives/flatlaf-natives-windows/src/main/cpp/ApiVersion.cpp

@@ -24,7 +24,7 @@
 
 // increase this version if changing API or functionality of native library
 // also update version in Java class com.formdev.flatlaf.ui.FlatNativeWindowsLibrary
-#define API_VERSION_WINDOWS		1001
+#define API_VERSION_WINDOWS		1002
 
 
 //---- JNI methods ------------------------------------------------------------

flatlaf-natives/flatlaf-natives-windows/src/main/cpp/FlatWndProc.cpp

@@ -30,6 +30,7 @@
  * @author Karl Tauber
  */
 
+// declare exported methods
 HWND getWindowHandle( JNIEnv* env, jobject window );
 
 //---- JNI methods ------------------------------------------------------------

flatlaf-natives/flatlaf-natives-windows/src/main/cpp/JNIUtils.cpp

@@ -0,0 +1,67 @@
+/*
+ * Copyright 2024 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.
+ */
+
+// avoid inlining of printf()
+#define _NO_CRT_STDIO_INLINE
+
+#include "JNIUtils.h"
+
+/**
+ * @author Karl Tauber
+ */
+
+//---- class AutoReleaseString ------------------------------------------------
+
+AutoReleaseString::AutoReleaseString( JNIEnv* _env, jstring _javaString ) {
+	env = _env;
+	javaString = _javaString;
+	chars = (javaString != NULL) ? env->GetStringChars( javaString, NULL ) : NULL;
+}
+
+AutoReleaseString::~AutoReleaseString() {
+	if( chars != NULL )
+		env->ReleaseStringChars( javaString, chars );
+}
+
+//---- class AutoReleaseStringArray -------------------------------------------
+
+AutoReleaseStringArray::AutoReleaseStringArray( JNIEnv* _env, jobjectArray _javaStringArray ) {
+	env = _env;
+	count = (_javaStringArray != NULL) ? env->GetArrayLength( _javaStringArray ) : 0;
+	if( count <= 0 )
+		return;
+
+	javaStringArray = new jstring[count];
+	charsArray = new const jchar*[count];
+
+	for( int i = 0; i < count; i++ ) {
+		javaStringArray[i] = (jstring) env->GetObjectArrayElement( _javaStringArray, i );
+		charsArray[i] = env->GetStringChars( javaStringArray[i] , NULL );
+	}
+}
+
+AutoReleaseStringArray::~AutoReleaseStringArray() {
+	if( count == 0 )
+		return;
+
+	for( int i = 0; i < count; i++ ) {
+		env->ReleaseStringChars( javaStringArray[i], charsArray[i] );
+		env->DeleteLocalRef( javaStringArray[i] );
+	}
+
+	delete[] javaStringArray;
+	delete[] charsArray;
+}

flatlaf-natives/flatlaf-natives-windows/src/main/cpp/Runtime.cpp

@@ -36,8 +36,11 @@
  * @author Karl Tauber
  */
 
+HINSTANCE _instance;
+
 extern "C"
 BOOL WINAPI _DllMainCRTStartup( HINSTANCE instance, DWORD reason, LPVOID reserved ) {
+	_instance = instance;
 	return TRUE;
 }
 

flatlaf-natives/flatlaf-natives-windows/src/main/cpp/WinFileChooser.cpp

@@ -0,0 +1,333 @@
+/*
+ * Copyright 2024 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.
+ */
+
+// avoid inlining of printf()
+#define _NO_CRT_STDIO_INLINE
+
+#include <windows.h>
+#include <shobjidl.h>
+#include "JNIUtils.h"
+#include "com_formdev_flatlaf_ui_FlatNativeWindowsLibrary.h"
+
+/**
+ * @author Karl Tauber
+ * @since 3.7
+ */
+
+// declare external methods
+extern HWND getWindowHandle( JNIEnv* env, jobject window );
+
+// declare internal methods
+static jobjectArray getFiles( JNIEnv* env, jboolean open, IFileDialog* dialog );
+
+//---- class AutoReleasePtr ---------------------------------------------------
+
+template<class T> class AutoReleasePtr {
+	T* ptr;
+
+public:
+	AutoReleasePtr() {
+		ptr = NULL;
+	}
+	AutoReleasePtr( T* p ) {
+		ptr = p;
+		ptr->AddRef();
+	}
+	~AutoReleasePtr() {
+		if( ptr != NULL )
+			ptr->Release();
+	}
+	T** operator&() { return &ptr; }
+	T* operator->() { return ptr; }
+	operator T*() { return ptr; }
+};
+
+//---- class AutoReleaseIShellItem --------------------------------------------
+
+class AutoReleaseIShellItem : public AutoReleasePtr<IShellItem> {
+public:
+	AutoReleaseIShellItem( JNIEnv* env, jstring path ) {
+		AutoReleaseString cpath( env, path );
+		::SHCreateItemFromParsingName( cpath, NULL, IID_IShellItem, reinterpret_cast<void**>( &*this ) );
+	}
+};
+
+//---- class FilterSpec -------------------------------------------------------
+
+class FilterSpec {
+	AutoReleaseStringArray fileTypes;
+
+public:
+	UINT count = 0;
+	COMDLG_FILTERSPEC* specs = NULL;
+
+public:
+	FilterSpec( JNIEnv* _env, jobjectArray _fileTypes )
+		: fileTypes( _env, _fileTypes )
+	{
+		if( fileTypes.count == 0 )
+			return;
+
+		count = fileTypes.count / 2;
+		specs = new COMDLG_FILTERSPEC[fileTypes.count];
+
+		for( int i = 0; i < count; i++ ) {
+			specs[i].pszName = fileTypes[i * 2];
+			specs[i].pszSpec = fileTypes[(i * 2) + 1];
+		}
+	}
+	~FilterSpec() {
+		if( specs != NULL )
+			delete[] specs;
+	}
+};
+
+//---- class DialogEventHandler -----------------------------------------------
+
+// see https://github.com/microsoft/Windows-classic-samples/blob/main/Samples/Win7Samples/winui/shell/appplatform/commonfiledialog/CommonFileDialogApp.cpp
+
+class DialogEventHandler : public IFileDialogEvents {
+	JNIEnv* env;
+	jboolean open;
+	jobject callback;
+	LONG refCount = 1;
+
+public:
+	DialogEventHandler( JNIEnv* _env, jboolean _open, jobject _callback ) {
+		env = _env;
+		open = _open;
+		callback = _callback;
+	}
+
+	//---- IFileDialogEvents methods ----
+
+	IFACEMETHODIMP OnFileOk( IFileDialog* dialog ) {
+		if( callback == NULL )
+			return S_OK;
+
+		// get files
+		jobjectArray files;
+		if( open ) {
+			AutoReleasePtr<IFileOpenDialog> openDialog;
+			HRESULT hr = dialog->QueryInterface( &openDialog );
+			files = SUCCEEDED( hr ) ? getFiles( env, true, openDialog ) : getFiles( env, false, dialog );
+		} else
+			files = getFiles( env, false, dialog );
+
+		// get hwnd of file dialog
+		HWND hwndFileDialog = 0;
+		AutoReleasePtr<IOleWindow> window;
+		if( SUCCEEDED( dialog->QueryInterface( &window ) ) )
+			window->GetWindow( &hwndFileDialog );
+
+		// invoke callback: boolean approve( String[] files, long hwnd );
+		jclass cls = env->GetObjectClass( callback );
+		jmethodID approveID = env->GetMethodID( cls, "approve", "([Ljava/lang/String;J)Z" );
+		if( approveID == NULL )
+			return S_OK;
+		return env->CallBooleanMethod( callback, approveID, files, hwndFileDialog ) ? S_OK : S_FALSE;
+	}
+
+	IFACEMETHODIMP OnFolderChange( IFileDialog* ) { return S_OK; }
+	IFACEMETHODIMP OnFolderChanging( IFileDialog*, IShellItem* ) { return S_OK; }
+	IFACEMETHODIMP OnHelp( IFileDialog* ) { return S_OK; }
+	IFACEMETHODIMP OnSelectionChange( IFileDialog* ) { return S_OK; }
+	IFACEMETHODIMP OnShareViolation( IFileDialog*, IShellItem*, FDE_SHAREVIOLATION_RESPONSE* ) { return S_OK; }
+	IFACEMETHODIMP OnTypeChange( IFileDialog*pfd ) { return S_OK; }
+	IFACEMETHODIMP OnOverwrite( IFileDialog*, IShellItem*, FDE_OVERWRITE_RESPONSE* ) { return S_OK; }
+
+	//---- IUnknown methods ----
+
+	IFACEMETHODIMP QueryInterface( REFIID riid, void** ppv ) {
+		if( riid != IID_IFileDialogEvents && riid != IID_IUnknown )
+			return E_NOINTERFACE;
+
+		*ppv = static_cast<IFileDialogEvents*>( this );
+		AddRef();
+		return S_OK;
+	}
+
+	IFACEMETHODIMP_(ULONG) AddRef() {
+		return InterlockedIncrement( &refCount );
+	}
+
+	IFACEMETHODIMP_(ULONG) Release() {
+		LONG newRefCount = InterlockedDecrement( &refCount );
+		if( newRefCount == 0 )
+			delete this;
+		return newRefCount;
+	}
+
+private:
+	~DialogEventHandler() {}
+};
+
+//---- class CoInitializer ----------------------------------------------------
+
+class CoInitializer {
+public:
+	bool initialized;
+
+	CoInitializer() {
+		HRESULT result = ::CoInitializeEx( NULL, COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE );
+		initialized = SUCCEEDED( result );
+	}
+	~CoInitializer() {
+		if( initialized )
+			::CoUninitialize();
+	}
+};
+
+//---- helper -----------------------------------------------------------------
+
+#define isOptionSet( option ) ((optionsSet & com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_ ## option) != 0)
+#define CHECK_HRESULT( code ) { if( (code) != S_OK ) return NULL; }
+
+static jobjectArray newJavaStringArray( JNIEnv* env, jsize count ) {
+	jclass stringClass = env->FindClass( "java/lang/String" );
+	return env->NewObjectArray( count, stringClass, NULL );
+}
+
+static jstring newJavaString( JNIEnv* env, LPWSTR str ) {
+	return env->NewString( reinterpret_cast<jchar*>( str ), static_cast<jsize>( wcslen( str ) ) );
+}
+
+//---- JNI methods ------------------------------------------------------------
+
+extern "C"
+JNIEXPORT jobjectArray JNICALL Java_com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_showFileChooser
+	( JNIEnv* env, jclass cls, jobject owner, jboolean open,
+		jstring title, jstring okButtonLabel, jstring fileNameLabel, jstring fileName,
+		jstring folder, jstring saveAsItem, jstring defaultFolder, jstring defaultExtension,
+		jint optionsSet, jint optionsClear, jobject callback, jint fileTypeIndex, jobjectArray fileTypes )
+{
+	// initialize COM library
+	CoInitializer coInitializer;
+	if( !coInitializer.initialized )
+		return NULL;
+
+	// handle limitations (without this, some Win32 method fails and this method returns NULL)
+	if( isOptionSet( FOS_PICKFOLDERS ) ) {
+		open = true; // always use IFileOpenDialog for picking folders
+		fileTypes = NULL; // no filter allowed for picking folders
+	}
+	if( !open && isOptionSet( FOS_ALLOWMULTISELECT ) )
+		optionsSet &= ~FOS_ALLOWMULTISELECT;
+
+	// convert Java strings to C strings
+	AutoReleaseString ctitle( env, title );
+	AutoReleaseString cokButtonLabel( env, okButtonLabel );
+	AutoReleaseString cfileNameLabel( env, fileNameLabel );
+	AutoReleaseString cfileName( env, fileName );
+	AutoReleaseIShellItem cfolder( env, folder );
+	AutoReleaseIShellItem csaveAsItem( env, saveAsItem );
+	AutoReleaseIShellItem cdefaultFolder( env, defaultFolder );
+	AutoReleaseString cdefaultExtension( env, defaultExtension );
+	FilterSpec specs( env, fileTypes );
+
+	// create IFileOpenDialog or IFileSaveDialog
+	// https://learn.microsoft.com/en-us/windows/win32/shell/common-file-dialog
+	AutoReleasePtr<IFileDialog> dialog;
+	CHECK_HRESULT( ::CoCreateInstance( open ? CLSID_FileOpenDialog : CLSID_FileSaveDialog,
+		NULL, CLSCTX_INPROC_SERVER, open ? IID_IFileOpenDialog : IID_IFileSaveDialog,
+		reinterpret_cast<LPVOID*>( &dialog ) ) );
+
+	// set title, etc.
+	if( ctitle != NULL )
+		CHECK_HRESULT( dialog->SetTitle( ctitle ) );
+	if( cokButtonLabel != NULL )
+		CHECK_HRESULT( dialog->SetOkButtonLabel( cokButtonLabel ) );
+	if( cfileNameLabel != NULL )
+		CHECK_HRESULT( dialog->SetFileNameLabel( cfileNameLabel ) );
+	if( cfileName != NULL )
+		CHECK_HRESULT( dialog->SetFileName( cfileName ) );
+	if( cfolder != NULL )
+		CHECK_HRESULT( dialog->SetFolder( cfolder ) );
+	if( !open && csaveAsItem != NULL )
+		CHECK_HRESULT( ((IFileSaveDialog*)(IFileDialog*)dialog)->SetSaveAsItem( csaveAsItem ) );
+	if( cdefaultFolder != NULL )
+		CHECK_HRESULT( dialog->SetDefaultFolder( cdefaultFolder ) );
+	if( cdefaultExtension != NULL )
+		CHECK_HRESULT( dialog->SetDefaultExtension( cdefaultExtension ) );
+
+	// set options
+	FILEOPENDIALOGOPTIONS existingOptions;
+	CHECK_HRESULT( dialog->GetOptions( &existingOptions ) );
+	CHECK_HRESULT( dialog->SetOptions ( (existingOptions & ~optionsClear) | optionsSet ) );
+
+	// initialize filter
+	if( specs.count > 0 ) {
+		CHECK_HRESULT( dialog->SetFileTypes( specs.count, specs.specs ) );
+		if( fileTypeIndex > 0 )
+			CHECK_HRESULT( dialog->SetFileTypeIndex( min( fileTypeIndex + 1, specs.count ) ) );
+	}
+
+	// add event handler
+	AutoReleasePtr<DialogEventHandler> handler( new DialogEventHandler( env, open, callback ) );
+	DWORD dwCookie = 0;
+	CHECK_HRESULT( dialog->Advise( handler, &dwCookie ) );
+
+	// show dialog
+	HWND hwndOwner = (owner != NULL) ? getWindowHandle( env, owner ) : NULL;
+	HRESULT hr = dialog->Show( hwndOwner );
+	dialog->Unadvise( dwCookie );
+	if( hr == HRESULT_FROM_WIN32(ERROR_CANCELLED) )
+		return newJavaStringArray( env, 0 );
+	CHECK_HRESULT( hr );
+
+	// get selected files as Java string array
+	return getFiles( env, open, dialog );
+}
+
+static jobjectArray getFiles( JNIEnv* env, jboolean open, IFileDialog* dialog ) {
+	if( open ) {
+		AutoReleasePtr<IShellItemArray> shellItems;
+		DWORD count;
+		CHECK_HRESULT( ((IFileOpenDialog*)(IFileDialog*)dialog)->GetResults( &shellItems ) );
+		CHECK_HRESULT( shellItems->GetCount( &count ) );
+
+		// convert shell items to Java string array
+		jobjectArray array = newJavaStringArray( env, count );
+		for( int i = 0; i < count; i++ ) {
+			AutoReleasePtr<IShellItem> shellItem;
+			LPWSTR path;
+			CHECK_HRESULT( shellItems->GetItemAt( i, &shellItem ) );
+			CHECK_HRESULT( shellItem->GetDisplayName( SIGDN_FILESYSPATH, &path ) );
+
+			jstring jpath = newJavaString( env, path );
+			CoTaskMemFree( path );
+
+			env->SetObjectArrayElement( array, i, jpath );
+			env->DeleteLocalRef( jpath );
+		}
+		return array;
+	} else {
+		AutoReleasePtr<IShellItem> shellItem;
+		LPWSTR path;
+		CHECK_HRESULT( dialog->GetResult( &shellItem ) );
+		CHECK_HRESULT( shellItem->GetDisplayName( SIGDN_FILESYSPATH, &path ) );
+
+		// convert shell item to Java string array
+		jstring jpath = newJavaString( env, path );
+		CoTaskMemFree( path );
+
+		jobjectArray array = newJavaStringArray( env, 1 );
+		env->SetObjectArrayElement( array, 0, jpath );
+		env->DeleteLocalRef( jpath );
+
+		return array;
+	}
+}

flatlaf-natives/flatlaf-natives-windows/src/main/cpp/WinMessageDialog.cpp

@@ -0,0 +1,419 @@
+/*
+ * Copyright 2025 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.
+ */
+
+// avoid inlining of printf()
+#define _NO_CRT_STDIO_INLINE
+
+#include <windows.h>
+#include <stdio.h>
+#include "JNIUtils.h"
+#include "com_formdev_flatlaf_ui_FlatNativeWindowsLibrary.h"
+
+/**
+ * @author Karl Tauber
+ * @since 3.7
+ */
+
+#define ID_BUTTON1		101
+
+// declare external fields
+extern HINSTANCE _instance;
+
+// declare internal methods
+static byte* createInMemoryTemplate( HWND owner, int messageType, LPCWSTR title, LPCWSTR text,
+	int defaultButton, int buttonCount, LPCWSTR* buttons );
+static INT_PTR CALLBACK messageDialogProc( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam );
+static int textLengthAsDLUs( HDC hdc, LPCWSTR str, int strLen );
+static LONG pixel2dluX( LONG px );
+static LONG pixel2dluY( LONG px );
+static LONG dluX2pixel( LONG dluX );
+static LPWORD lpwAlign( LPWORD lpIn );
+
+
+extern "C"
+JNIEXPORT jint JNICALL Java_com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_showMessageBox
+	( JNIEnv* env, jclass cls, jlong hwndParent, jstring text, jstring caption, jint type )
+{
+	// convert Java strings to C strings
+	AutoReleaseString ctext( env, text );
+	AutoReleaseString ccaption( env, caption );
+
+	return ::MessageBox( reinterpret_cast<HWND>( hwndParent ), ctext, ccaption, type );
+}
+
+extern "C"
+JNIEXPORT jint JNICALL Java_com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_showMessageDialog
+	( JNIEnv* env, jclass cls, jlong hwndParent, jint messageType, jstring title,
+		jstring text, jint defaultButton, jobjectArray buttons )
+{
+	HWND owner = reinterpret_cast<HWND>( hwndParent );
+
+	// convert Java strings to C strings
+	AutoReleaseString ctitle( env, title );
+	AutoReleaseString ctext( env, text );
+	AutoReleaseStringArray cbuttons( env, buttons );
+
+	// get title from parent window if necessary
+	WCHAR parentTitle[100];
+	if( ctitle == NULL )
+		::GetWindowText( owner, parentTitle, 100 );
+
+	byte* templ = createInMemoryTemplate( owner, messageType, (ctitle != NULL) ? ctitle : parentTitle,
+		ctext, defaultButton, cbuttons.count, cbuttons );
+	if( templ == NULL )
+		return -1;
+
+	LRESULT ret = ::DialogBoxIndirect( _instance, (LPDLGTEMPLATE) templ, owner, messageDialogProc );
+	delete templ;
+	return (ret >= ID_BUTTON1) ? ret - ID_BUTTON1 : -1;
+}
+
+
+// all values in DLUs
+
+#define INSETS_TOP				12
+#define INSETS_LEFT				12
+#define INSETS_RIGHT			12
+#define INSETS_BOTTOM			6
+
+#define ICON_TEXT_GAP			8
+
+#define LABEL_MIN_WIDTH			100
+#define LABEL_MAX_WIDTH			250
+#define LABEL_HEIGHT			8
+
+#define BUTTON_WIDTH			50
+#define BUTTON_HEIGHT			12
+#define BUTTON_GAP				5
+#define BUTTON_TOP_GAP			14
+#define BUTTON_LEFT_RIGHT_GAP	8
+
+// based on https://learn.microsoft.com/en-us/windows/win32/dlgbox/using-dialog-boxes#creating-a-template-in-memory
+static byte* createInMemoryTemplate( HWND owner, int messageType, LPCWSTR title, LPCWSTR text,
+	int defaultButton, int buttonCount, LPCWSTR* buttons )
+{
+	// get font info needed for DS_SETFONT
+	NONCLIENTMETRICS ncMetrics;
+	ncMetrics.cbSize = sizeof( NONCLIENTMETRICS );
+	if( !::SystemParametersInfo( SPI_GETNONCLIENTMETRICS, 0, &ncMetrics, 0 ) )
+		return NULL;
+
+	// create DC to use message font
+	HDC hdcOwner = ::GetDC( owner );
+	HDC hdc = ::CreateCompatibleDC( hdcOwner );
+	::ReleaseDC( owner, hdcOwner );
+	if( hdc == NULL )
+		return NULL;
+
+	HFONT hfont = ::CreateFontIndirect( &ncMetrics.lfMessageFont );
+	if( hfont == NULL ) {
+		::DeleteDC( hdc );
+		return NULL;
+	}
+
+	if( ::SelectObject( hdc, hfont ) == NULL ) {
+		::DeleteDC( hdc );
+		::DeleteObject( hfont );
+		return NULL;
+	}
+
+	//---- calculate layout (in DLUs) ----
+
+	// layout icon
+	LPWSTR icon;
+	switch( messageType ) {
+		case /* JOptionPane.ERROR_MESSAGE */       0: icon = IDI_ERROR; break;
+		case /* JOptionPane.INFORMATION_MESSAGE */ 1: icon = IDI_INFORMATION; break;
+		case /* JOptionPane.WARNING_MESSAGE */     2: icon = IDI_WARNING; break;
+		case /* JOptionPane.QUESTION_MESSAGE */    3: icon = IDI_QUESTION; break;
+		default:
+		case /* JOptionPane.PLAIN_MESSAGE */      -1: icon = NULL; break;
+	}
+	int ix = INSETS_LEFT;
+	int iy = INSETS_TOP;
+	int iw = pixel2dluX( ::GetSystemMetrics( SM_CXICON ) );
+	int ih = pixel2dluY( ::GetSystemMetrics( SM_CYICON ) );
+
+	// layout text
+	int tx = ix + (icon != NULL ? iw + ICON_TEXT_GAP : 0);
+	int ty = iy;
+	int tw = 0;
+	int th = 0;
+	if( text == NULL )
+		text = L"";
+	LPWSTR wrappedText = new WCHAR[wcslen( text ) + 1];
+	wcscpy( wrappedText, text );
+	LPWSTR lineStart = wrappedText;
+	for( LPWSTR t = wrappedText; ; t++ ) {
+		if( *t != '\n' && *t != 0 )
+			continue;
+
+		// calculate line width (in pixels) and number of charaters that fit into LABEL_MAX_WIDTH
+		int lineLen = t - lineStart;
+		int fit = 0;
+		SIZE size{ 0 };
+		if( !::GetTextExtentExPoint( hdc, lineStart, lineLen, dluX2pixel( LABEL_MAX_WIDTH ), &fit, NULL, &size ) )
+			break;
+
+		if( fit < lineLen ) {
+			// wrap too long line --> try to wrap at space character
+			bool wrapped = false;
+			for( LPWSTR t2 = lineStart + fit - 1; t2 > lineStart; t2-- ) {
+				if( *t2 == ' ' || *t2 == '\t' ) {
+					*t2 = '\n';
+					int w = textLengthAsDLUs( hdc, lineStart, t2 - lineStart );
+					tw = max( tw, w );
+					th += LABEL_HEIGHT;
+
+					// continue wrapping after inserted line break
+					t = t2;
+					lineStart = t + 1;
+					wrapped = true;
+					break;
+				}
+			}
+			if( !wrapped ) {
+				// not able to wrap at word --> break long word
+				int breakIndex = (lineStart + fit) - wrappedText;
+				int w = textLengthAsDLUs( hdc, lineStart, breakIndex );
+				tw = max( tw, w );
+				th += LABEL_HEIGHT;
+
+				// duplicate string
+				LPWSTR wrappedText2 = new WCHAR[wcslen( wrappedText ) + 1 + 1];
+				// use wcscpy(), instead of wcsncpy(), because this method is inlined and does not require linking to runtime lib
+				wcscpy( wrappedText2, wrappedText );
+				wrappedText2[breakIndex] = '\n';
+				wcscpy( wrappedText2 + breakIndex + 1, wrappedText + breakIndex );
+
+				// delete old text
+				delete[] wrappedText;
+				wrappedText = wrappedText2;
+
+				// continue wrapping after inserted line break
+				t = wrappedText + breakIndex;
+				lineStart = t + 1;
+			}
+		} else {
+			// line fits into LABEL_MAX_WIDTH
+			int w = pixel2dluX( size.cx );
+			tw = max( tw, w );
+			th += LABEL_HEIGHT;
+			lineStart = t + 1;
+		}
+
+		if( *t == 0 )
+			break;
+	}
+	tw = min( max( tw, LABEL_MIN_WIDTH ), LABEL_MAX_WIDTH );
+	th = max( th, LABEL_HEIGHT );
+	if( icon != NULL && th < ih )
+		ty += (ih - th) / 2; // vertically center text
+
+	// layout buttons
+	int* bw = new int[buttonCount];
+	int buttonTotalWidth = BUTTON_GAP * (buttonCount - 1);
+	for( int i = 0; i < buttonCount; i++ ) {
+		int w = textLengthAsDLUs( hdc, buttons[i], -1 ) + 16;
+		bw[i] = max( BUTTON_WIDTH, w );
+		buttonTotalWidth += bw[i];
+	}
+
+	// layout dialog
+	int dx = 0;
+	int dy = 0;
+	int dw = max( tx + tw + INSETS_RIGHT, BUTTON_LEFT_RIGHT_GAP + buttonTotalWidth + BUTTON_LEFT_RIGHT_GAP );
+	int dh = max( iy + ih, ty + th ) + BUTTON_TOP_GAP + BUTTON_HEIGHT + INSETS_BOTTOM;
+
+	// center dialog in owner
+	RECT ownerRect{ 0 };
+	if( ::GetClientRect( owner, &ownerRect ) ) {
+		dx = (pixel2dluX( ownerRect.right - ownerRect.left ) - dw) / 2;
+		dy = (pixel2dluY( ownerRect.bottom - ownerRect.top ) - dh) / 2;
+	}
+
+	// layout button area
+	int bx = dw - buttonTotalWidth - BUTTON_LEFT_RIGHT_GAP;
+	int by = dh - BUTTON_HEIGHT - INSETS_BOTTOM;
+
+	// get font info needed for DS_SETFONT
+	int fontPointSize = (ncMetrics.lfMessageFont.lfHeight < 0)
+		? -MulDiv( ncMetrics.lfMessageFont.lfHeight, 72, ::GetDeviceCaps( hdc, LOGPIXELSY ) )
+		: ncMetrics.lfMessageFont.lfHeight;
+	LPCWSTR fontFaceName = ncMetrics.lfMessageFont.lfFaceName;
+
+	// delete DC and font
+	::DeleteDC( hdc );
+	::DeleteObject( hfont );
+
+	// (approximately) calculate memory size needed for in-memory template
+	int templSize = (sizeof(DLGTEMPLATE) + /*menu*/ 2 + /*class*/ 2 + /*title*/ 2)
+		+ ((sizeof(DLGITEMTEMPLATE) + /*class*/ 4 + /*title/icon*/ 4 + /*creation data*/ 2) * (/*icon+text*/2 + buttonCount))
+		+ (title != NULL ? (wcslen( title ) + 1) * sizeof(wchar_t) : 0)
+		+ /*fontPointSize*/ 2 + ((wcslen( fontFaceName ) + 1) * sizeof(wchar_t))
+		+ ((wcslen( wrappedText ) + 1) * sizeof(wchar_t));
+	for( int i = 0; i < buttonCount; i++ )
+		templSize += ((wcslen( buttons[i] ) + 1) * sizeof(wchar_t));
+
+	templSize += (2 * (1 + 1 + buttonCount)); // necessary for DWORD alignment
+	templSize += 100; // some reserve
+
+	// allocate memory for in-memory template
+	byte* templ = new byte[templSize];
+	if( templ == NULL )
+		return NULL;
+
+
+	//---- define dialog box ----
+
+	LPDLGTEMPLATE lpdt = (LPDLGTEMPLATE) templ;
+	lpdt->style = WS_POPUP | WS_BORDER | WS_SYSMENU | DS_MODALFRAME | WS_CAPTION | DS_SETFONT;
+	lpdt->cdit = /*text*/ 1 + buttonCount; // number of controls
+	lpdt->x = dx;
+	lpdt->y = dy;
+	lpdt->cx = dw;
+	lpdt->cy = dh;
+
+	LPWORD lpw = (LPWORD) (lpdt + 1);
+	*lpw++ = 0; // no menu
+	*lpw++ = 0; // predefined dialog box class (by default)
+	if( title != NULL ) {
+		wcscpy( (LPWSTR) lpw, title );
+		lpw += wcslen( title ) + 1;
+	} else
+		*lpw++ = 0; // no title
+
+	// for DS_SETFONT
+	*lpw++ = fontPointSize;
+	wcscpy( (LPWSTR) lpw, fontFaceName );
+	lpw += wcslen( fontFaceName ) + 1;
+
+	//---- define icon ----
+
+	if( icon != NULL ) {
+		lpdt->cdit++;
+
+		lpw = lpwAlign( lpw );
+		LPDLGITEMTEMPLATE lpdit = (LPDLGITEMTEMPLATE) lpw;
+		lpdit->x = ix;
+		lpdit->y = iy;
+		lpdit->cx = iw;
+		lpdit->cy = ih;
+		lpdit->id = ID_BUTTON1 - 1;
+		lpdit->style = WS_CHILD | WS_VISIBLE | SS_ICON;
+
+		lpw = (LPWORD) (lpdit + 1);
+		*lpw++ = 0xffff; *lpw++ = 0x0082;		// Static class
+		*lpw++ = 0xffff; *lpw++ = (WORD) icon;	// icon
+		*lpw++ = 0;								// creation data
+	}
+
+
+	//---- define text ----
+
+	lpw = lpwAlign( lpw );
+	LPDLGITEMTEMPLATE lpdit = (LPDLGITEMTEMPLATE) lpw;
+	lpdit->x = tx;
+	lpdit->y = ty;
+	lpdit->cx = tw;
+	lpdit->cy = th;
+	lpdit->id = ID_BUTTON1 - 2;
+	lpdit->style = WS_CHILD | WS_VISIBLE | SS_LEFT | SS_NOPREFIX | SS_EDITCONTROL;
+
+	lpw = (LPWORD) (lpdit + 1);
+	*lpw++ = 0xffff; *lpw++ = 0x0082;										// Static class
+	wcscpy( (LPWSTR) lpw, wrappedText ); lpw += wcslen( wrappedText ) + 1;	// text
+	*lpw++ = 0;																// creation data
+
+
+	//---- define buttons ----
+
+	defaultButton = min( max( defaultButton, 0 ), buttonCount - 1 );
+	int buttonId = ID_BUTTON1;
+	for( int i = 0; i < buttonCount; i++ ) {
+		lpw = lpwAlign( lpw );
+		LPDLGITEMTEMPLATE lpdit = (LPDLGITEMTEMPLATE) lpw;
+		lpdit->x = bx;
+		lpdit->y = by;
+		lpdit->cx = bw[i];
+		lpdit->cy = BUTTON_HEIGHT;
+		lpdit->id = buttonId++;
+		lpdit->style = WS_CHILD | WS_VISIBLE | WS_TABSTOP | (i == 0 ? WS_GROUP : 0)
+			| BS_TEXT | (i == defaultButton ? BS_DEFPUSHBUTTON : BS_PUSHBUTTON);
+
+		lpw = (LPWORD) (lpdit + 1);
+		*lpw++ = 0xffff; *lpw++ = 0x0080;										// Button class
+		wcscpy( (LPWSTR) lpw, buttons[i] ); lpw += wcslen( buttons[i] ) + 1;	// text
+		*lpw++ = 0;																// creation data
+
+		bx += bw[i] + BUTTON_GAP;
+	}
+
+	delete[] wrappedText;
+	delete[] bw;
+	
+	return templ;
+}
+
+static BOOL CALLBACK focusDefaultButtonProc( HWND hwnd, LPARAM lParam ) {
+	if( ::GetWindowLong( hwnd, GWL_ID ) >= ID_BUTTON1 ) {
+		LONG style = ::GetWindowLong( hwnd, GWL_STYLE );
+		if( (style & BS_DEFPUSHBUTTON) != 0 ) {
+			::SetFocus( hwnd );
+			return FALSE;
+		}
+	}
+	return TRUE;
+}
+
+static INT_PTR CALLBACK messageDialogProc( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam ) {
+	switch( uMsg ) {
+		case WM_INITDIALOG:
+			::EnumChildWindows( hwnd, focusDefaultButtonProc, 0 );
+			break;
+
+		case WM_COMMAND:
+			::EndDialog( hwnd, wParam );
+			return TRUE;
+	}
+	return FALSE;
+}
+
+static int textLengthAsDLUs( HDC hdc, LPCWSTR str, int strLen ) {
+	SIZE size{ 0 };
+	::GetTextExtentPoint32( hdc, str, (strLen >= 0) ? strLen : wcslen( str ), &size );
+	return pixel2dluX( size.cx );
+}
+
+static LONG pixel2dluX( LONG px ) {
+	return MulDiv( px, 4, LOWORD( ::GetDialogBaseUnits() ) );
+}
+
+static LONG pixel2dluY( LONG py ) {
+	return MulDiv( py, 8, HIWORD( ::GetDialogBaseUnits() ) );
+}
+
+static LONG dluX2pixel( LONG dluX ) {
+	return MulDiv( dluX, LOWORD( ::GetDialogBaseUnits() ), 4 );
+}
+
+static LPWORD lpwAlign( LPWORD lpIn ) {
+	ULONG_PTR ul = (ULONG_PTR) lpIn;
+	ul += 3;
+	ul >>= 2;
+	ul <<= 2;
+	return (LPWORD) ul;
+}

flatlaf-natives/flatlaf-natives-windows/src/main/cpp/WinWrapper.cpp

@@ -25,8 +25,8 @@
  * @author Karl Tauber
  */
 
-// see FlatWndProc.cpp
+// declare external methods
-HWND getWindowHandle( JNIEnv* env, jobject window );
+extern HWND getWindowHandle( JNIEnv* env, jobject window );
 
 //---- Utility ----------------------------------------------------------------
 

flatlaf-natives/flatlaf-natives-windows/src/main/headers/JNIUtils.h

@@ -0,0 +1,53 @@
+/*
+ * Copyright 2025 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.
+ */
+
+#include <windows.h>
+#include <jni.h>
+
+/**
+ * @author Karl Tauber
+ */
+
+//---- class AutoReleaseString ------------------------------------------------
+
+class AutoReleaseString {
+	JNIEnv* env;
+	jstring javaString;
+	const jchar* chars;
+
+public:
+	AutoReleaseString( JNIEnv* _env, jstring _javaString );
+	~AutoReleaseString();
+
+	operator LPCWSTR() { return (LPCWSTR) chars; }
+};
+
+//---- class AutoReleaseStringArray -------------------------------------------
+
+class AutoReleaseStringArray {
+	JNIEnv* env;
+	jstring* javaStringArray;
+	const jchar** charsArray;
+
+public:
+	UINT count;
+
+public:
+	AutoReleaseStringArray( JNIEnv* _env, jobjectArray _javaStringArray );
+	~AutoReleaseStringArray();
+
+	operator LPCWSTR*() { return (LPCWSTR*) charsArray; }
+};

flatlaf-natives/flatlaf-natives-windows/src/main/headers/com_formdev_flatlaf_ui_FlatNativeWindowsLibrary.h

@@ -27,6 +27,52 @@ extern "C" {
 #define com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_DWMWA_COLOR_DEFAULT -1L
 #undef com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_DWMWA_COLOR_NONE
 #define com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_DWMWA_COLOR_NONE -2L
+#undef com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_OVERWRITEPROMPT
+#define com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_OVERWRITEPROMPT 2L
+#undef com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_STRICTFILETYPES
+#define com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_STRICTFILETYPES 4L
+#undef com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_NOCHANGEDIR
+#define com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_NOCHANGEDIR 8L
+#undef com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_PICKFOLDERS
+#define com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_PICKFOLDERS 32L
+#undef com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_FORCEFILESYSTEM
+#define com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_FORCEFILESYSTEM 64L
+#undef com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_ALLNONSTORAGEITEMS
+#define com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_ALLNONSTORAGEITEMS 128L
+#undef com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_NOVALIDATE
+#define com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_NOVALIDATE 256L
+#undef com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_ALLOWMULTISELECT
+#define com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_ALLOWMULTISELECT 512L
+#undef com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_PATHMUSTEXIST
+#define com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_PATHMUSTEXIST 2048L
+#undef com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_FILEMUSTEXIST
+#define com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_FILEMUSTEXIST 4096L
+#undef com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_CREATEPROMPT
+#define com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_CREATEPROMPT 8192L
+#undef com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_SHAREAWARE
+#define com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_SHAREAWARE 16384L
+#undef com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_NOREADONLYRETURN
+#define com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_NOREADONLYRETURN 32768L
+#undef com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_NOTESTFILECREATE
+#define com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_NOTESTFILECREATE 65536L
+#undef com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_HIDEMRUPLACES
+#define com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_HIDEMRUPLACES 131072L
+#undef com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_HIDEPINNEDPLACES
+#define com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_HIDEPINNEDPLACES 262144L
+#undef com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_NODEREFERENCELINKS
+#define com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_NODEREFERENCELINKS 1048576L
+#undef com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_OKBUTTONNEEDSINTERACTION
+#define com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_OKBUTTONNEEDSINTERACTION 2097152L
+#undef com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_DONTADDTORECENT
+#define com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_DONTADDTORECENT 33554432L
+#undef com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_FORCESHOWHIDDEN
+#define com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_FORCESHOWHIDDEN 268435456L
+#undef com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_DEFAULTNOMINIMODE
+#define com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_DEFAULTNOMINIMODE 536870912L
+#undef com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_FORCEPREVIEWPANEON
+#define com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_FORCEPREVIEWPANEON 1073741824L
+#undef com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_SUPPORTSTREAMABLEITEMS
+#define com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_FOS_SUPPORTSTREAMABLEITEMS -2147483648L
 /*
  * Class:     com_formdev_flatlaf_ui_FlatNativeWindowsLibrary
  * Method:    getOSBuildNumberImpl
@@ -67,6 +113,30 @@ JNIEXPORT jboolean JNICALL Java_com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_
 JNIEXPORT jboolean JNICALL Java_com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_dwmSetWindowAttributeDWORD
   (JNIEnv *, jclass, jlong, jint, jint);
 
+/*
+ * Class:     com_formdev_flatlaf_ui_FlatNativeWindowsLibrary
+ * Method:    showFileChooser
+ * Signature: (Ljava/awt/Window;ZLjava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;IILcom/formdev/flatlaf/ui/FlatNativeWindowsLibrary/FileChooserCallback;I[Ljava/lang/String;)[Ljava/lang/String;
+ */
+JNIEXPORT jobjectArray JNICALL Java_com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_showFileChooser
+  (JNIEnv *, jclass, jobject, jboolean, jstring, jstring, jstring, jstring, jstring, jstring, jstring, jstring, jint, jint, jobject, jint, jobjectArray);
+
+/*
+ * Class:     com_formdev_flatlaf_ui_FlatNativeWindowsLibrary
+ * Method:    showMessageDialog
+ * Signature: (JILjava/lang/String;Ljava/lang/String;I[Ljava/lang/String;)I
+ */
+JNIEXPORT jint JNICALL Java_com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_showMessageDialog
+  (JNIEnv *, jclass, jlong, jint, jstring, jstring, jint, jobjectArray);
+
+/*
+ * Class:     com_formdev_flatlaf_ui_FlatNativeWindowsLibrary
+ * Method:    showMessageBox
+ * Signature: (JLjava/lang/String;Ljava/lang/String;I)I
+ */
+JNIEXPORT jint JNICALL Java_com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_showMessageBox
+  (JNIEnv *, jclass, jlong, jstring, jstring, jint);
+
 #ifdef __cplusplus
 }
 #endif

flatlaf-testing/build.gradle.kts

@@ -41,6 +41,7 @@ dependencies {
 	implementation( libs.jide.oss )
 	implementation( libs.glazedlists )
 	implementation( libs.netbeans.api.awt )
+	implementation( libs.nativejfilechooser )
 
 	components.all<TargetJvmVersion8Rule>()
 }

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatSystemFileChooserLinuxTest.java

@@ -0,0 +1,382 @@
+/*
+ * Copyright 2025 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.testing;
+
+import static com.formdev.flatlaf.ui.FlatNativeLinuxLibrary.*;
+import java.awt.EventQueue;
+import java.awt.SecondaryLoop;
+import java.awt.Toolkit;
+import java.awt.Window;
+import java.util.Arrays;
+import java.util.concurrent.atomic.AtomicInteger;
+import javax.swing.*;
+import com.formdev.flatlaf.extras.components.*;
+import com.formdev.flatlaf.extras.components.FlatTriStateCheckBox.State;
+import com.formdev.flatlaf.testing.FlatSystemFileChooserTest.DummyModalDialog;
+import com.formdev.flatlaf.ui.FlatNativeLinuxLibrary;
+import net.miginfocom.swing.*;
+
+/**
+ * @author Karl Tauber
+ */
+public class FlatSystemFileChooserLinuxTest
+	extends FlatTestPanel
+{
+	public static void main( String[] args ) {
+		SwingUtilities.invokeLater( () -> {
+			if( !FlatNativeLinuxLibrary.isLoaded() ) {
+				JOptionPane.showMessageDialog( null, "FlatLaf native library not loaded" );
+				return;
+			}
+
+			FlatTestFrame frame = FlatTestFrame.create( args, "FlatSystemFileChooserLinuxTest" );
+			FlatSystemFileChooserTest.addListeners( frame );
+			frame.showFrame( FlatSystemFileChooserLinuxTest::new );
+		} );
+	}
+
+	FlatSystemFileChooserLinuxTest() {
+		initComponents();
+
+		fileTypesField.setSelectedItem( null );
+	}
+
+	private void open() {
+		openOrSave( true, false );
+	}
+
+	private void save() {
+		openOrSave( false, false );
+	}
+
+	private void openDirect() {
+		openOrSave( true, true );
+	}
+
+	private void saveDirect() {
+		openOrSave( false, true );
+	}
+
+	private void openOrSave( boolean open, boolean direct ) {
+		Window frame = SwingUtilities.windowForComponent( this );
+		if( ownerFrameRadioButton.isSelected() )
+			openOrSave( open, direct, frame );
+		else if( ownerDialogRadioButton.isSelected() )
+			new DummyModalDialog( frame, owner -> openOrSave( open, direct, owner ) ).setVisible( true );
+		else
+			openOrSave( open, direct, null );
+	}
+
+	private void openOrSave( boolean open, boolean direct, Window owner ) {
+		String title = n( titleField.getText() );
+		String okButtonLabel = n( okButtonLabelField.getText() );
+		String currentName = n( currentNameField.getText() );
+		String currentFolder = n( currentFolderField.getText() );
+		AtomicInteger optionsSet = new AtomicInteger();
+		AtomicInteger optionsClear = new AtomicInteger();
+
+		o( FC_select_folder, select_folderCheckBox, optionsSet, optionsClear );
+		o( FC_select_multiple, select_multipleCheckBox, optionsSet, optionsClear );
+		o( FC_show_hidden, show_hiddenCheckBox, optionsSet, optionsClear );
+		o( FC_local_only, local_onlyCheckBox, optionsSet, optionsClear );
+		o( FC_do_overwrite_confirmation, do_overwrite_confirmationCheckBox, optionsSet, optionsClear );
+		o( FC_create_folders, create_foldersCheckBox, optionsSet, optionsClear );
+
+		String fileTypesStr = n( (String) fileTypesField.getSelectedItem() );
+		String[] fileTypes = {};
+		if( fileTypesStr != null ) {
+			if( !fileTypesStr.endsWith( ",null" ) )
+				fileTypesStr += ",null";
+			fileTypes = fileTypesStr.trim().split( "[,]+" );
+			for( int i = 0; i < fileTypes.length; i++ ) {
+				if( "null".equals( fileTypes[i] ) )
+					fileTypes[i] = null;
+			}
+		}
+		int fileTypeIndex = fileTypeIndexSlider.getValue();
+
+		FlatNativeLinuxLibrary.FileChooserCallback callback = (files, hwndFileDialog) -> {
+			System.out.println( "  -- callback " + hwndFileDialog + "  " + Arrays.toString( files ) );
+			if( showMessageDialogOnOKCheckBox.isSelected() ) {
+				System.out.println( FlatNativeLinuxLibrary.showMessageDialog( hwndFileDialog,
+					JOptionPane.INFORMATION_MESSAGE,
+					"primary text", "secondary text", 1, "Yes", "No" ) );
+			}
+			return true;
+		};
+
+		System.out.println( FlatNativeLinuxLibrary.isGtk3Available() );
+
+		if( direct ) {
+			String[] files = FlatNativeLinuxLibrary.showFileChooser( owner, open,
+				title, okButtonLabel, currentName, currentFolder,
+				optionsSet.get(), optionsClear.get(), callback, fileTypeIndex, fileTypes );
+
+			filesField.setText( (files != null) ? Arrays.toString( files ).replace( ',', '\n' ) : "null" );
+		} else {
+			SecondaryLoop secondaryLoop = Toolkit.getDefaultToolkit().getSystemEventQueue().createSecondaryLoop();
+
+			String[] fileTypes2 = fileTypes;
+			new Thread( () -> {
+				String[] files = FlatNativeLinuxLibrary.showFileChooser( owner, open,
+					title, okButtonLabel, currentName, currentFolder,
+					optionsSet.get(), optionsClear.get(), callback, fileTypeIndex, fileTypes2 );
+
+				System.out.println( "    secondaryLoop.exit() returned " + secondaryLoop.exit() );
+
+				EventQueue.invokeLater( () -> {
+					filesField.setText( (files != null) ? Arrays.toString( files ).replace( ',', '\n' ) : "null" );
+				} );
+			} ).start();
+
+			System.out.println( "---- enter secondary loop ----" );
+			System.out.println( "---- secondary loop exited (secondaryLoop.enter() returned " + secondaryLoop.enter() + ") ----" );
+		}
+	}
+
+	private static String n( String s ) {
+		return s != null && !s.isEmpty() ? s : null;
+	}
+
+	private static void o( int option, FlatTriStateCheckBox checkBox, AtomicInteger optionsSet, AtomicInteger optionsClear ) {
+		if( checkBox.getState() == State.SELECTED )
+			optionsSet.set( optionsSet.get() | option );
+		else if( checkBox.getState() == State.UNSELECTED )
+			optionsClear.set( optionsClear.get() | option );
+	}
+
+	private void initComponents() {
+		// JFormDesigner - Component initialization - DO NOT MODIFY  //GEN-BEGIN:initComponents
+		JLabel ownerLabel = new JLabel();
+		ownerFrameRadioButton = new JRadioButton();
+		ownerDialogRadioButton = new JRadioButton();
+		ownerNullRadioButton = new JRadioButton();
+		JPanel ownerSpacer = new JPanel(null);
+		JLabel titleLabel = new JLabel();
+		titleField = new JTextField();
+		JPanel panel1 = new JPanel();
+		select_folderCheckBox = new FlatTriStateCheckBox();
+		select_multipleCheckBox = new FlatTriStateCheckBox();
+		do_overwrite_confirmationCheckBox = new FlatTriStateCheckBox();
+		create_foldersCheckBox = new FlatTriStateCheckBox();
+		show_hiddenCheckBox = new FlatTriStateCheckBox();
+		local_onlyCheckBox = new FlatTriStateCheckBox();
+		JLabel okButtonLabelLabel = new JLabel();
+		okButtonLabelField = new JTextField();
+		JLabel currentNameLabel = new JLabel();
+		currentNameField = new JTextField();
+		JLabel currentFolderLabel = new JLabel();
+		currentFolderField = new JTextField();
+		JLabel fileTypesLabel = new JLabel();
+		fileTypesField = new JComboBox<>();
+		JLabel fileTypeIndexLabel = new JLabel();
+		fileTypeIndexSlider = new JSlider();
+		JButton openButton = new JButton();
+		JButton saveButton = new JButton();
+		JButton openDirectButton = new JButton();
+		JButton saveDirectButton = new JButton();
+		showMessageDialogOnOKCheckBox = new JCheckBox();
+		JScrollPane filesScrollPane = new JScrollPane();
+		filesField = new JTextArea();
+
+		//======== this ========
+		setLayout(new MigLayout(
+			"ltr,insets dialog,hidemode 3",
+			// columns
+			"[left]" +
+			"[grow,fill]" +
+			"[fill]",
+			// rows
+			"[]" +
+			"[]" +
+			"[]" +
+			"[]" +
+			"[]" +
+			"[]" +
+			"[]" +
+			"[]" +
+			"[grow,fill]"));
+
+		//---- ownerLabel ----
+		ownerLabel.setText("owner");
+		add(ownerLabel, "cell 0 0");
+
+		//---- ownerFrameRadioButton ----
+		ownerFrameRadioButton.setText("JFrame");
+		ownerFrameRadioButton.setSelected(true);
+		add(ownerFrameRadioButton, "cell 1 0");
+
+		//---- ownerDialogRadioButton ----
+		ownerDialogRadioButton.setText("JDialog");
+		add(ownerDialogRadioButton, "cell 1 0");
+
+		//---- ownerNullRadioButton ----
+		ownerNullRadioButton.setText("null");
+		add(ownerNullRadioButton, "cell 1 0");
+		add(ownerSpacer, "cell 1 0,growx");
+
+		//---- titleLabel ----
+		titleLabel.setText("title");
+		add(titleLabel, "cell 0 1");
+		add(titleField, "cell 1 1");
+
+		//======== panel1 ========
+		{
+			panel1.setLayout(new MigLayout(
+				"insets 2,hidemode 3",
+				// columns
+				"[left]",
+				// rows
+				"[]0" +
+				"[]0" +
+				"[]0" +
+				"[]0" +
+				"[]0" +
+				"[]"));
+
+			//---- select_folderCheckBox ----
+			select_folderCheckBox.setText("select_folder");
+			select_folderCheckBox.setAllowIndeterminate(false);
+			select_folderCheckBox.setState(FlatTriStateCheckBox.State.UNSELECTED);
+			panel1.add(select_folderCheckBox, "cell 0 0");
+
+			//---- select_multipleCheckBox ----
+			select_multipleCheckBox.setText("select_multiple");
+			select_multipleCheckBox.setState(FlatTriStateCheckBox.State.UNSELECTED);
+			select_multipleCheckBox.setAllowIndeterminate(false);
+			panel1.add(select_multipleCheckBox, "cell 0 1");
+
+			//---- do_overwrite_confirmationCheckBox ----
+			do_overwrite_confirmationCheckBox.setText("do_overwrite_confirmation");
+			panel1.add(do_overwrite_confirmationCheckBox, "cell 0 2");
+
+			//---- create_foldersCheckBox ----
+			create_foldersCheckBox.setText("create_folders");
+			panel1.add(create_foldersCheckBox, "cell 0 3");
+
+			//---- show_hiddenCheckBox ----
+			show_hiddenCheckBox.setText("show_hidden");
+			panel1.add(show_hiddenCheckBox, "cell 0 4");
+
+			//---- local_onlyCheckBox ----
+			local_onlyCheckBox.setText("local_only");
+			panel1.add(local_onlyCheckBox, "cell 0 5");
+		}
+		add(panel1, "cell 2 1 1 6,aligny top,growy 0");
+
+		//---- okButtonLabelLabel ----
+		okButtonLabelLabel.setText("okButtonLabel");
+		add(okButtonLabelLabel, "cell 0 2");
+		add(okButtonLabelField, "cell 1 2");
+
+		//---- currentNameLabel ----
+		currentNameLabel.setText("currentName");
+		add(currentNameLabel, "cell 0 3");
+		add(currentNameField, "cell 1 3");
+
+		//---- currentFolderLabel ----
+		currentFolderLabel.setText("currentFolder");
+		add(currentFolderLabel, "cell 0 4");
+		add(currentFolderField, "cell 1 4");
+
+		//---- fileTypesLabel ----
+		fileTypesLabel.setText("fileTypes");
+		add(fileTypesLabel, "cell 0 5");
+
+		//---- fileTypesField ----
+		fileTypesField.setEditable(true);
+		fileTypesField.setModel(new DefaultComboBoxModel<>(new String[] {
+			"Text Files,*.txt,null",
+			"All Files,*,null",
+			"Text Files,*.txt,null,PDF Files,*.pdf,null,All Files,*,null",
+			"Text and PDF Files,*.txt,*.pdf,null"
+		}));
+		add(fileTypesField, "cell 1 5");
+
+		//---- fileTypeIndexLabel ----
+		fileTypeIndexLabel.setText("fileTypeIndex");
+		add(fileTypeIndexLabel, "cell 0 6");
+
+		//---- fileTypeIndexSlider ----
+		fileTypeIndexSlider.setMaximum(10);
+		fileTypeIndexSlider.setMajorTickSpacing(1);
+		fileTypeIndexSlider.setValue(0);
+		fileTypeIndexSlider.setPaintLabels(true);
+		fileTypeIndexSlider.setSnapToTicks(true);
+		add(fileTypeIndexSlider, "cell 1 6");
+
+		//---- openButton ----
+		openButton.setText("Open...");
+		openButton.addActionListener(e -> open());
+		add(openButton, "cell 0 7 3 1");
+
+		//---- saveButton ----
+		saveButton.setText("Save...");
+		saveButton.addActionListener(e -> save());
+		add(saveButton, "cell 0 7 3 1");
+
+		//---- openDirectButton ----
+		openDirectButton.setText("Open (no-thread)...");
+		openDirectButton.addActionListener(e -> openDirect());
+		add(openDirectButton, "cell 0 7 3 1");
+
+		//---- saveDirectButton ----
+		saveDirectButton.setText("Save (no-thread)...");
+		saveDirectButton.addActionListener(e -> saveDirect());
+		add(saveDirectButton, "cell 0 7 3 1");
+
+		//---- showMessageDialogOnOKCheckBox ----
+		showMessageDialogOnOKCheckBox.setText("show message dialog on OK");
+		add(showMessageDialogOnOKCheckBox, "cell 0 7 3 1");
+
+		//======== filesScrollPane ========
+		{
+
+			//---- filesField ----
+			filesField.setRows(8);
+			filesScrollPane.setViewportView(filesField);
+		}
+		add(filesScrollPane, "cell 0 8 3 1,growx");
+
+		//---- ownerButtonGroup ----
+		ButtonGroup ownerButtonGroup = new ButtonGroup();
+		ownerButtonGroup.add(ownerFrameRadioButton);
+		ownerButtonGroup.add(ownerDialogRadioButton);
+		ownerButtonGroup.add(ownerNullRadioButton);
+		// JFormDesigner - End of component initialization  //GEN-END:initComponents
+	}
+
+	// JFormDesigner - Variables declaration - DO NOT MODIFY  //GEN-BEGIN:variables
+	private JRadioButton ownerFrameRadioButton;
+	private JRadioButton ownerDialogRadioButton;
+	private JRadioButton ownerNullRadioButton;
+	private JTextField titleField;
+	private FlatTriStateCheckBox select_folderCheckBox;
+	private FlatTriStateCheckBox select_multipleCheckBox;
+	private FlatTriStateCheckBox do_overwrite_confirmationCheckBox;
+	private FlatTriStateCheckBox create_foldersCheckBox;
+	private FlatTriStateCheckBox show_hiddenCheckBox;
+	private FlatTriStateCheckBox local_onlyCheckBox;
+	private JTextField okButtonLabelField;
+	private JTextField currentNameField;
+	private JTextField currentFolderField;
+	private JComboBox<String> fileTypesField;
+	private JSlider fileTypeIndexSlider;
+	private JCheckBox showMessageDialogOnOKCheckBox;
+	private JTextArea filesField;
+	// JFormDesigner - End of variables declaration  //GEN-END:variables
+}

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatSystemFileChooserLinuxTest.jfd

@@ -0,0 +1,280 @@
+JFDML JFormDesigner: "8.2.2.0.9999" Java: "21.0.1" encoding: "UTF-8"
+
+new FormModel {
+	contentType: "form/swing"
+	root: new FormRoot {
+		auxiliary() {
+			"JavaCodeGenerator.defaultVariableLocal": true
+		}
+		add( new FormContainer( "com.formdev.flatlaf.testing.FlatTestPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
+			"$layoutConstraints": "ltr,insets dialog,hidemode 3"
+			"$columnConstraints": "[left][grow,fill][fill]"
+			"$rowConstraints": "[][][][][][][][][grow,fill]"
+		} ) {
+			name: "this"
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "ownerLabel"
+				"text": "owner"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 0"
+			} )
+			add( new FormComponent( "javax.swing.JRadioButton" ) {
+				name: "ownerFrameRadioButton"
+				"text": "JFrame"
+				"$buttonGroup": new FormReference( "ownerButtonGroup" )
+				"selected": true
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 0"
+			} )
+			add( new FormComponent( "javax.swing.JRadioButton" ) {
+				name: "ownerDialogRadioButton"
+				"text": "JDialog"
+				"$buttonGroup": new FormReference( "ownerButtonGroup" )
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 0"
+			} )
+			add( new FormComponent( "javax.swing.JRadioButton" ) {
+				name: "ownerNullRadioButton"
+				"text": "null"
+				"$buttonGroup": new FormReference( "ownerButtonGroup" )
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 0"
+			} )
+			add( new FormComponent( "com.jformdesigner.designer.wrapper.HSpacer" ) {
+				name: "ownerSpacer"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 0,growx"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "titleLabel"
+				"text": "title"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 1"
+			} )
+			add( new FormComponent( "javax.swing.JTextField" ) {
+				name: "titleField"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 1"
+			} )
+			add( new FormContainer( "javax.swing.JPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
+				"$layoutConstraints": "insets 2,hidemode 3"
+				"$columnConstraints": "[left]"
+				"$rowConstraints": "[]0[]0[]0[]0[]0[]"
+			} ) {
+				name: "panel1"
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "select_folderCheckBox"
+					"text": "select_folder"
+					"allowIndeterminate": false
+					"state": enum com.formdev.flatlaf.extras.components.FlatTriStateCheckBox$State UNSELECTED
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 0"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "select_multipleCheckBox"
+					"text": "select_multiple"
+					"state": enum com.formdev.flatlaf.extras.components.FlatTriStateCheckBox$State UNSELECTED
+					"allowIndeterminate": false
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 1"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "do_overwrite_confirmationCheckBox"
+					"text": "do_overwrite_confirmation"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 2"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "create_foldersCheckBox"
+					"text": "create_folders"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 3"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "show_hiddenCheckBox"
+					"text": "show_hidden"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 4"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "local_onlyCheckBox"
+					"text": "local_only"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 5"
+				} )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 2 1 1 6,aligny top,growy 0"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "okButtonLabelLabel"
+				"text": "okButtonLabel"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 2"
+			} )
+			add( new FormComponent( "javax.swing.JTextField" ) {
+				name: "okButtonLabelField"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 2"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "currentNameLabel"
+				"text": "currentName"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 3"
+			} )
+			add( new FormComponent( "javax.swing.JTextField" ) {
+				name: "currentNameField"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 3"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "currentFolderLabel"
+				"text": "currentFolder"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 4"
+			} )
+			add( new FormComponent( "javax.swing.JTextField" ) {
+				name: "currentFolderField"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 4"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "fileTypesLabel"
+				"text": "fileTypes"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 5"
+			} )
+			add( new FormComponent( "javax.swing.JComboBox" ) {
+				name: "fileTypesField"
+				"editable": true
+				"model": new javax.swing.DefaultComboBoxModel {
+					selectedItem: "Text Files,*.txt,null"
+					addElement( "Text Files,*.txt,null" )
+					addElement( "All Files,*,null" )
+					addElement( "Text Files,*.txt,null,PDF Files,*.pdf,null,All Files,*,null" )
+					addElement( "Text and PDF Files,*.txt,*.pdf,null" )
+				}
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 5"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "fileTypeIndexLabel"
+				"text": "fileTypeIndex"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 6"
+			} )
+			add( new FormComponent( "javax.swing.JSlider" ) {
+				name: "fileTypeIndexSlider"
+				"maximum": 10
+				"majorTickSpacing": 1
+				"value": 0
+				"paintLabels": true
+				"snapToTicks": true
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 6"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "openButton"
+				"text": "Open..."
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "open", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 7 3 1"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "saveButton"
+				"text": "Save..."
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "save", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 7 3 1"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "openDirectButton"
+				"text": "Open (no-thread)..."
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "openDirect", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 7 3 1"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "saveDirectButton"
+				"text": "Save (no-thread)..."
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "saveDirect", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 7 3 1"
+			} )
+			add( new FormComponent( "javax.swing.JCheckBox" ) {
+				name: "showMessageDialogOnOKCheckBox"
+				"text": "show message dialog on OK"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 7 3 1"
+			} )
+			add( new FormContainer( "javax.swing.JScrollPane", new FormLayoutManager( class javax.swing.JScrollPane ) ) {
+				name: "filesScrollPane"
+				add( new FormComponent( "javax.swing.JTextArea" ) {
+					name: "filesField"
+					"rows": 8
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				} )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 8 3 1,growx"
+			} )
+		}, new FormLayoutConstraints( null ) {
+			"location": new java.awt.Point( 0, 0 )
+			"size": new java.awt.Dimension( 690, 630 )
+		} )
+		add( new FormNonVisual( "javax.swing.ButtonGroup" ) {
+			name: "ownerButtonGroup"
+		}, new FormLayoutConstraints( null ) {
+			"location": new java.awt.Point( 0, 640 )
+		} )
+	}
+}

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatSystemFileChooserMacTest.java

@@ -0,0 +1,564 @@
+/*
+ * Copyright 2024 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.testing;
+
+import static com.formdev.flatlaf.ui.FlatNativeMacLibrary.*;
+import java.awt.SecondaryLoop;
+import java.awt.Toolkit;
+import java.awt.Window;
+import java.util.Arrays;
+import java.util.concurrent.atomic.AtomicInteger;
+import javax.swing.*;
+import com.formdev.flatlaf.FlatLaf;
+import com.formdev.flatlaf.extras.components.*;
+import com.formdev.flatlaf.extras.components.FlatTriStateCheckBox.State;
+import com.formdev.flatlaf.testing.FlatSystemFileChooserTest.DummyModalDialog;
+import com.formdev.flatlaf.ui.FlatNativeMacLibrary;
+import com.formdev.flatlaf.util.SystemInfo;
+import net.miginfocom.swing.*;
+
+/**
+ * @author Karl Tauber
+ */
+public class FlatSystemFileChooserMacTest
+	extends FlatTestPanel
+{
+	public static void main( String[] args ) {
+		// macOS  (see https://www.formdev.com/flatlaf/macos/)
+		if( SystemInfo.isMacOS ) {
+			// enable screen menu bar
+			// (moves menu bar from JFrame window to top of screen)
+			System.setProperty( "apple.laf.useScreenMenuBar", "true" );
+
+			// appearance of window title bars
+			// possible values:
+			//   - "system": use current macOS appearance (light or dark)
+			//   - "NSAppearanceNameAqua": use light appearance
+			//   - "NSAppearanceNameDarkAqua": use dark appearance
+			// (needs to be set on main thread; setting it on AWT thread does not work)
+			System.setProperty( "apple.awt.application.appearance", "system" );
+		}
+
+		SwingUtilities.invokeLater( () -> {
+			if( !FlatNativeMacLibrary.isLoaded() ) {
+				JOptionPane.showMessageDialog( null, "FlatLaf native library not loaded" );
+				return;
+			}
+
+			FlatTestFrame frame = FlatTestFrame.create( args, "FlatSystemFileChooserMacTest" );
+			FlatSystemFileChooserTest.addListeners( frame );
+			frame.showFrame( FlatSystemFileChooserMacTest::new );
+			frame.setJMenuBar( menuBar1 );
+		} );
+	}
+
+	FlatSystemFileChooserMacTest() {
+		initComponents();
+
+		fileTypesField.setSelectedItem( null );
+	}
+
+	private void open() {
+		openOrSave( true, false );
+	}
+
+	private void save() {
+		openOrSave( false, false );
+	}
+
+	private void openDirect() {
+		openOrSave( true, true );
+	}
+
+	private void saveDirect() {
+		openOrSave( false, true );
+	}
+
+	private void openOrSave( boolean open, boolean direct ) {
+		Window frame = SwingUtilities.windowForComponent( this );
+		if( ownerFrameRadioButton.isSelected() )
+			openOrSave( open, direct, frame );
+		else if( ownerDialogRadioButton.isSelected() )
+			new DummyModalDialog( frame, owner -> openOrSave( open, direct, owner ) ).setVisible( true );
+		else
+			openOrSave( open, direct, null );
+	}
+
+	private void openOrSave( boolean open, boolean direct, Window owner ) {
+		String title = n( titleField.getText() );
+		String prompt = n( promptField.getText() );
+		String message = n( messageField.getText() );
+		String filterFieldLabel = n( filterFieldLabelField.getText() );
+		String nameFieldLabel = n( nameFieldLabelField.getText() );
+		String nameFieldStringValue = n( nameFieldStringValueField.getText() );
+		String directoryURL = n( directoryURLField.getText() );
+		AtomicInteger optionsSet = new AtomicInteger();
+		AtomicInteger optionsClear = new AtomicInteger();
+
+		// NSOpenPanel
+		if( canChooseFilesCheckBox.isSelected() )
+			optionsSet.set( optionsSet.get() | FC_canChooseFiles );
+		if( canChooseDirectoriesCheckBox.isSelected() )
+			optionsSet.set( optionsSet.get() | FC_canChooseDirectories );
+		o( FC_resolvesAliases, resolvesAliasesCheckBox, optionsSet, optionsClear );
+		o( FC_allowsMultipleSelection, allowsMultipleSelectionCheckBox, optionsSet, optionsClear );
+		if( accessoryViewDisclosedCheckBox.isSelected() )
+			optionsSet.set( optionsSet.get() | FC_accessoryViewDisclosed );
+
+		// NSSavePanel
+		o( FC_showsTagField, showsTagFieldCheckBox, optionsSet, optionsClear );
+		o( FC_canCreateDirectories, canCreateDirectoriesCheckBox, optionsSet, optionsClear );
+		o( FC_canSelectHiddenExtension, canSelectHiddenExtensionCheckBox, optionsSet, optionsClear );
+		o( FC_showsHiddenFiles, showsHiddenFilesCheckBox, optionsSet, optionsClear );
+		o( FC_extensionHidden, extensionHiddenCheckBox, optionsSet, optionsClear );
+		o( FC_allowsOtherFileTypes, allowsOtherFileTypesCheckBox, optionsSet, optionsClear );
+		o( FC_treatsFilePackagesAsDirectories, treatsFilePackagesAsDirectoriesCheckBox, optionsSet, optionsClear );
+
+		// custom
+		if( showSingleFilterFieldCheckBox.isSelected() )
+			optionsSet.set( optionsSet.get() | FC_showSingleFilterField );
+
+		String fileTypesStr = n( (String) fileTypesField.getSelectedItem() );
+		String[] fileTypes = {};
+		if( fileTypesStr != null ) {
+			if( !fileTypesStr.endsWith( ",null" ) )
+				fileTypesStr += ",null";
+			fileTypes = fileTypesStr.trim().split( "[,]+" );
+			for( int i = 0; i < fileTypes.length; i++ ) {
+				if( "null".equals( fileTypes[i] ) )
+					fileTypes[i] = null;
+			}
+		}
+		int fileTypeIndex = fileTypeIndexSlider.getValue();
+
+		FlatNativeMacLibrary.FileChooserCallback callback = (files, hwndFileDialog) -> {
+			System.out.println( "  -- callback " + hwndFileDialog + "  " + Arrays.toString( files ) );
+			if( showMessageDialogOnOKCheckBox.isSelected() ) {
+				int result = FlatNativeMacLibrary.showMessageDialog( hwndFileDialog,
+					JOptionPane.INFORMATION_MESSAGE,
+					"primary text", "secondary text", 0, "Yes", "No" );
+				System.out.println( "     result   " + result );
+				if( result != 0 )
+					return false;
+			}
+			return true;
+		};
+
+		int dark = FlatLaf.isLafDark() ? 1 : 0;
+		if( direct ) {
+			String[] files = FlatNativeMacLibrary.showFileChooser( owner, dark, open,
+				title, prompt, message, filterFieldLabel,
+				nameFieldLabel, nameFieldStringValue, directoryURL,
+				optionsSet.get(), optionsClear.get(), callback, fileTypeIndex, fileTypes );
+
+			filesField.setText( (files != null) ? Arrays.toString( files ).replace( ',', '\n' ) : "null" );
+		} else {
+			SecondaryLoop secondaryLoop = Toolkit.getDefaultToolkit().getSystemEventQueue().createSecondaryLoop();
+
+			String[] fileTypes2 = fileTypes;
+			new Thread( () -> {
+				String[] files = FlatNativeMacLibrary.showFileChooser( owner, dark, open,
+					title, prompt, message, filterFieldLabel,
+					nameFieldLabel, nameFieldStringValue, directoryURL,
+					optionsSet.get(), optionsClear.get(), callback, fileTypeIndex, fileTypes2 );
+
+				System.out.println( "    secondaryLoop.exit() returned " + secondaryLoop.exit() );
+
+				SwingUtilities.invokeLater( () -> {
+					filesField.setText( (files != null) ? Arrays.toString( files ).replace( ',', '\n' ) : "null" );
+				} );
+			} ).start();
+
+			System.out.println( "---- enter secondary loop ----" );
+			System.out.println( "---- secondary loop exited (secondaryLoop.enter() returned " + secondaryLoop.enter() + ") ----" );
+		}
+	}
+
+	private static String n( String s ) {
+		return s != null && !s.isEmpty() ? s : null;
+	}
+
+	private static void o( int option, FlatTriStateCheckBox checkBox, AtomicInteger optionsSet, AtomicInteger optionsClear ) {
+		if( checkBox.getState() == State.SELECTED )
+			optionsSet.set( optionsSet.get() | option );
+		else if( checkBox.getState() == State.UNSELECTED )
+			optionsClear.set( optionsClear.get() | option );
+	}
+
+	private void menuItemAction() {
+		System.out.println( "menu item action" );
+	}
+
+	private void initComponents() {
+		// JFormDesigner - Component initialization - DO NOT MODIFY  //GEN-BEGIN:initComponents
+		JLabel ownerLabel = new JLabel();
+		ownerFrameRadioButton = new JRadioButton();
+		ownerDialogRadioButton = new JRadioButton();
+		ownerNullRadioButton = new JRadioButton();
+		JPanel ownerSpacer = new JPanel(null);
+		JLabel titleLabel = new JLabel();
+		titleField = new JTextField();
+		JPanel panel1 = new JPanel();
+		JLabel options1Label = new JLabel();
+		canChooseFilesCheckBox = new JCheckBox();
+		canChooseDirectoriesCheckBox = new JCheckBox();
+		resolvesAliasesCheckBox = new FlatTriStateCheckBox();
+		allowsMultipleSelectionCheckBox = new FlatTriStateCheckBox();
+		accessoryViewDisclosedCheckBox = new JCheckBox();
+		JLabel options2Label = new JLabel();
+		showsTagFieldCheckBox = new FlatTriStateCheckBox();
+		canCreateDirectoriesCheckBox = new FlatTriStateCheckBox();
+		canSelectHiddenExtensionCheckBox = new FlatTriStateCheckBox();
+		showsHiddenFilesCheckBox = new FlatTriStateCheckBox();
+		extensionHiddenCheckBox = new FlatTriStateCheckBox();
+		allowsOtherFileTypesCheckBox = new FlatTriStateCheckBox();
+		treatsFilePackagesAsDirectoriesCheckBox = new FlatTriStateCheckBox();
+		JLabel options3Label = new JLabel();
+		showSingleFilterFieldCheckBox = new JCheckBox();
+		JLabel promptLabel = new JLabel();
+		promptField = new JTextField();
+		JLabel messageLabel = new JLabel();
+		messageField = new JTextField();
+		JLabel filterFieldLabelLabel = new JLabel();
+		filterFieldLabelField = new JTextField();
+		JLabel nameFieldLabelLabel = new JLabel();
+		nameFieldLabelField = new JTextField();
+		JLabel nameFieldStringValueLabel = new JLabel();
+		nameFieldStringValueField = new JTextField();
+		JLabel directoryURLLabel = new JLabel();
+		directoryURLField = new JTextField();
+		JLabel fileTypesLabel = new JLabel();
+		fileTypesField = new JComboBox<>();
+		JLabel fileTypeIndexLabel = new JLabel();
+		fileTypeIndexSlider = new JSlider();
+		JButton openButton = new JButton();
+		JButton saveButton = new JButton();
+		JButton openDirectButton = new JButton();
+		JButton saveDirectButton = new JButton();
+		showMessageDialogOnOKCheckBox = new JCheckBox();
+		JScrollPane filesScrollPane = new JScrollPane();
+		filesField = new JTextArea();
+		menuBar1 = new JMenuBar();
+		JMenu menu1 = new JMenu();
+		JMenuItem menuItem1 = new JMenuItem();
+		JMenuItem menuItem2 = new JMenuItem();
+		JMenu menu2 = new JMenu();
+		JMenuItem menuItem3 = new JMenuItem();
+		JMenuItem menuItem4 = new JMenuItem();
+
+		//======== this ========
+		setLayout(new MigLayout(
+			"ltr,insets dialog,hidemode 3",
+			// columns
+			"[left]" +
+			"[grow,fill]" +
+			"[fill]",
+			// rows
+			"[]" +
+			"[]" +
+			"[]" +
+			"[]" +
+			"[]" +
+			"[]" +
+			"[]" +
+			"[]" +
+			"[]" +
+			"[]" +
+			"[]" +
+			"[]" +
+			"[grow,fill]"));
+
+		//---- ownerLabel ----
+		ownerLabel.setText("owner");
+		add(ownerLabel, "cell 0 0");
+
+		//---- ownerFrameRadioButton ----
+		ownerFrameRadioButton.setText("JFrame");
+		ownerFrameRadioButton.setSelected(true);
+		add(ownerFrameRadioButton, "cell 1 0");
+
+		//---- ownerDialogRadioButton ----
+		ownerDialogRadioButton.setText("JDialog");
+		add(ownerDialogRadioButton, "cell 1 0");
+
+		//---- ownerNullRadioButton ----
+		ownerNullRadioButton.setText("null");
+		add(ownerNullRadioButton, "cell 1 0");
+		add(ownerSpacer, "cell 1 0,growx");
+
+		//---- titleLabel ----
+		titleLabel.setText("title");
+		add(titleLabel, "cell 0 1");
+		add(titleField, "cell 1 1");
+
+		//======== panel1 ========
+		{
+			panel1.setLayout(new MigLayout(
+				"insets 2,hidemode 3",
+				// columns
+				"[left]",
+				// rows
+				"[]" +
+				"[]0" +
+				"[]0" +
+				"[]0" +
+				"[]0" +
+				"[]para" +
+				"[]" +
+				"[]0" +
+				"[]0" +
+				"[]0" +
+				"[]0" +
+				"[]0" +
+				"[]0" +
+				"[]para" +
+				"[]" +
+				"[]"));
+
+			//---- options1Label ----
+			options1Label.setText("NSOpenPanel options:");
+			panel1.add(options1Label, "cell 0 0");
+
+			//---- canChooseFilesCheckBox ----
+			canChooseFilesCheckBox.setText("canChooseFiles");
+			canChooseFilesCheckBox.setSelected(true);
+			panel1.add(canChooseFilesCheckBox, "cell 0 1");
+
+			//---- canChooseDirectoriesCheckBox ----
+			canChooseDirectoriesCheckBox.setText("canChooseDirectories");
+			panel1.add(canChooseDirectoriesCheckBox, "cell 0 2");
+
+			//---- resolvesAliasesCheckBox ----
+			resolvesAliasesCheckBox.setText("resolvesAliases");
+			resolvesAliasesCheckBox.setState(FlatTriStateCheckBox.State.SELECTED);
+			panel1.add(resolvesAliasesCheckBox, "cell 0 3");
+
+			//---- allowsMultipleSelectionCheckBox ----
+			allowsMultipleSelectionCheckBox.setText("allowsMultipleSelection");
+			panel1.add(allowsMultipleSelectionCheckBox, "cell 0 4");
+
+			//---- accessoryViewDisclosedCheckBox ----
+			accessoryViewDisclosedCheckBox.setText("accessoryViewDisclosed");
+			panel1.add(accessoryViewDisclosedCheckBox, "cell 0 5");
+
+			//---- options2Label ----
+			options2Label.setText("NSOpenPanel and NSSavePanel options:");
+			panel1.add(options2Label, "cell 0 6");
+
+			//---- showsTagFieldCheckBox ----
+			showsTagFieldCheckBox.setText("showsTagField");
+			panel1.add(showsTagFieldCheckBox, "cell 0 7");
+
+			//---- canCreateDirectoriesCheckBox ----
+			canCreateDirectoriesCheckBox.setText("canCreateDirectories");
+			panel1.add(canCreateDirectoriesCheckBox, "cell 0 8");
+
+			//---- canSelectHiddenExtensionCheckBox ----
+			canSelectHiddenExtensionCheckBox.setText("canSelectHiddenExtension");
+			panel1.add(canSelectHiddenExtensionCheckBox, "cell 0 9");
+
+			//---- showsHiddenFilesCheckBox ----
+			showsHiddenFilesCheckBox.setText("showsHiddenFiles");
+			panel1.add(showsHiddenFilesCheckBox, "cell 0 10");
+
+			//---- extensionHiddenCheckBox ----
+			extensionHiddenCheckBox.setText("extensionHidden");
+			panel1.add(extensionHiddenCheckBox, "cell 0 11");
+
+			//---- allowsOtherFileTypesCheckBox ----
+			allowsOtherFileTypesCheckBox.setText("allowsOtherFileTypes");
+			panel1.add(allowsOtherFileTypesCheckBox, "cell 0 12");
+
+			//---- treatsFilePackagesAsDirectoriesCheckBox ----
+			treatsFilePackagesAsDirectoriesCheckBox.setText("treatsFilePackagesAsDirectories");
+			panel1.add(treatsFilePackagesAsDirectoriesCheckBox, "cell 0 13");
+
+			//---- options3Label ----
+			options3Label.setText("Custom options:");
+			panel1.add(options3Label, "cell 0 14");
+
+			//---- showSingleFilterFieldCheckBox ----
+			showSingleFilterFieldCheckBox.setText("showSingleFilterField");
+			panel1.add(showSingleFilterFieldCheckBox, "cell 0 15");
+		}
+		add(panel1, "cell 2 1 1 10,aligny top,growy 0");
+
+		//---- promptLabel ----
+		promptLabel.setText("prompt");
+		add(promptLabel, "cell 0 2");
+		add(promptField, "cell 1 2");
+
+		//---- messageLabel ----
+		messageLabel.setText("message");
+		add(messageLabel, "cell 0 3");
+		add(messageField, "cell 1 3");
+
+		//---- filterFieldLabelLabel ----
+		filterFieldLabelLabel.setText("filterFieldLabel");
+		add(filterFieldLabelLabel, "cell 0 4");
+		add(filterFieldLabelField, "cell 1 4");
+
+		//---- nameFieldLabelLabel ----
+		nameFieldLabelLabel.setText("nameFieldLabel");
+		add(nameFieldLabelLabel, "cell 0 5");
+		add(nameFieldLabelField, "cell 1 5");
+
+		//---- nameFieldStringValueLabel ----
+		nameFieldStringValueLabel.setText("nameFieldStringValue");
+		add(nameFieldStringValueLabel, "cell 0 6");
+		add(nameFieldStringValueField, "cell 1 6");
+
+		//---- directoryURLLabel ----
+		directoryURLLabel.setText("directoryURL");
+		add(directoryURLLabel, "cell 0 7");
+		add(directoryURLField, "cell 1 7");
+
+		//---- fileTypesLabel ----
+		fileTypesLabel.setText("fileTypes");
+		add(fileTypesLabel, "cell 0 8");
+
+		//---- fileTypesField ----
+		fileTypesField.setEditable(true);
+		fileTypesField.setModel(new DefaultComboBoxModel<>(new String[] {
+			"Text Files,txt,null",
+			"All Files,*,null",
+			"Text Files,txt,null,PDF Files,pdf,null,All Files,*,null",
+			"Text and PDF Files,txt,pdf,null",
+			"Compressed,zip,gz,null,Disk Images,dmg,null"
+		}));
+		add(fileTypesField, "cell 1 8");
+
+		//---- fileTypeIndexLabel ----
+		fileTypeIndexLabel.setText("fileTypeIndex");
+		add(fileTypeIndexLabel, "cell 0 9");
+
+		//---- fileTypeIndexSlider ----
+		fileTypeIndexSlider.setMaximum(10);
+		fileTypeIndexSlider.setMajorTickSpacing(1);
+		fileTypeIndexSlider.setValue(0);
+		fileTypeIndexSlider.setPaintLabels(true);
+		fileTypeIndexSlider.setSnapToTicks(true);
+		add(fileTypeIndexSlider, "cell 1 9");
+
+		//---- openButton ----
+		openButton.setText("Open...");
+		openButton.addActionListener(e -> open());
+		add(openButton, "cell 0 11 3 1");
+
+		//---- saveButton ----
+		saveButton.setText("Save...");
+		saveButton.addActionListener(e -> save());
+		add(saveButton, "cell 0 11 3 1");
+
+		//---- openDirectButton ----
+		openDirectButton.setText("Open (no-thread)...");
+		openDirectButton.addActionListener(e -> openDirect());
+		add(openDirectButton, "cell 0 11 3 1");
+
+		//---- saveDirectButton ----
+		saveDirectButton.setText("Save (no-thread)...");
+		saveDirectButton.addActionListener(e -> saveDirect());
+		add(saveDirectButton, "cell 0 11 3 1");
+
+		//---- showMessageDialogOnOKCheckBox ----
+		showMessageDialogOnOKCheckBox.setText("show message dialog on OK");
+		add(showMessageDialogOnOKCheckBox, "cell 0 11 3 1");
+
+		//======== filesScrollPane ========
+		{
+
+			//---- filesField ----
+			filesField.setRows(8);
+			filesScrollPane.setViewportView(filesField);
+		}
+		add(filesScrollPane, "cell 0 12 3 1,growx");
+
+		//======== menuBar1 ========
+		{
+
+			//======== menu1 ========
+			{
+				menu1.setText("text");
+
+				//---- menuItem1 ----
+				menuItem1.setText("text");
+				menuItem1.addActionListener(e -> menuItemAction());
+				menu1.add(menuItem1);
+
+				//---- menuItem2 ----
+				menuItem2.setText("text");
+				menuItem2.addActionListener(e -> menuItemAction());
+				menu1.add(menuItem2);
+			}
+			menuBar1.add(menu1);
+
+			//======== menu2 ========
+			{
+				menu2.setText("text");
+
+				//---- menuItem3 ----
+				menuItem3.setText("text");
+				menuItem3.addActionListener(e -> menuItemAction());
+				menu2.add(menuItem3);
+
+				//---- menuItem4 ----
+				menuItem4.setText("text");
+				menuItem4.addActionListener(e -> menuItemAction());
+				menu2.add(menuItem4);
+			}
+			menuBar1.add(menu2);
+		}
+
+		//---- ownerButtonGroup ----
+		ButtonGroup ownerButtonGroup = new ButtonGroup();
+		ownerButtonGroup.add(ownerFrameRadioButton);
+		ownerButtonGroup.add(ownerDialogRadioButton);
+		ownerButtonGroup.add(ownerNullRadioButton);
+		// JFormDesigner - End of component initialization  //GEN-END:initComponents
+	}
+
+	// JFormDesigner - Variables declaration - DO NOT MODIFY  //GEN-BEGIN:variables
+	private JRadioButton ownerFrameRadioButton;
+	private JRadioButton ownerDialogRadioButton;
+	private JRadioButton ownerNullRadioButton;
+	private JTextField titleField;
+	private JCheckBox canChooseFilesCheckBox;
+	private JCheckBox canChooseDirectoriesCheckBox;
+	private FlatTriStateCheckBox resolvesAliasesCheckBox;
+	private FlatTriStateCheckBox allowsMultipleSelectionCheckBox;
+	private JCheckBox accessoryViewDisclosedCheckBox;
+	private FlatTriStateCheckBox showsTagFieldCheckBox;
+	private FlatTriStateCheckBox canCreateDirectoriesCheckBox;
+	private FlatTriStateCheckBox canSelectHiddenExtensionCheckBox;
+	private FlatTriStateCheckBox showsHiddenFilesCheckBox;
+	private FlatTriStateCheckBox extensionHiddenCheckBox;
+	private FlatTriStateCheckBox allowsOtherFileTypesCheckBox;
+	private FlatTriStateCheckBox treatsFilePackagesAsDirectoriesCheckBox;
+	private JCheckBox showSingleFilterFieldCheckBox;
+	private JTextField promptField;
+	private JTextField messageField;
+	private JTextField filterFieldLabelField;
+	private JTextField nameFieldLabelField;
+	private JTextField nameFieldStringValueField;
+	private JTextField directoryURLField;
+	private JComboBox<String> fileTypesField;
+	private JSlider fileTypeIndexSlider;
+	private JCheckBox showMessageDialogOnOKCheckBox;
+	private JTextArea filesField;
+	private static JMenuBar menuBar1;
+	// JFormDesigner - End of variables declaration  //GEN-END:variables
+}

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatSystemFileChooserMacTest.jfd

@@ -0,0 +1,440 @@
+JFDML JFormDesigner: "8.2.2.0.9999" Java: "21.0.1" encoding: "UTF-8"
+
+new FormModel {
+	contentType: "form/swing"
+	root: new FormRoot {
+		auxiliary() {
+			"JavaCodeGenerator.defaultVariableLocal": true
+		}
+		add( new FormContainer( "com.formdev.flatlaf.testing.FlatTestPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
+			"$layoutConstraints": "ltr,insets dialog,hidemode 3"
+			"$columnConstraints": "[left][grow,fill][fill]"
+			"$rowConstraints": "[][][][][][][][][][][][][grow,fill]"
+		} ) {
+			name: "this"
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "ownerLabel"
+				"text": "owner"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 0"
+			} )
+			add( new FormComponent( "javax.swing.JRadioButton" ) {
+				name: "ownerFrameRadioButton"
+				"text": "JFrame"
+				"$buttonGroup": new FormReference( "ownerButtonGroup" )
+				"selected": true
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 0"
+			} )
+			add( new FormComponent( "javax.swing.JRadioButton" ) {
+				name: "ownerDialogRadioButton"
+				"text": "JDialog"
+				"$buttonGroup": new FormReference( "ownerButtonGroup" )
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 0"
+			} )
+			add( new FormComponent( "javax.swing.JRadioButton" ) {
+				name: "ownerNullRadioButton"
+				"text": "null"
+				"$buttonGroup": new FormReference( "ownerButtonGroup" )
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 0"
+			} )
+			add( new FormComponent( "com.jformdesigner.designer.wrapper.HSpacer" ) {
+				name: "ownerSpacer"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 0,growx"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "titleLabel"
+				"text": "title"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 1"
+			} )
+			add( new FormComponent( "javax.swing.JTextField" ) {
+				name: "titleField"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 1"
+			} )
+			add( new FormContainer( "javax.swing.JPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
+				"$layoutConstraints": "insets 2,hidemode 3"
+				"$columnConstraints": "[left]"
+				"$rowConstraints": "[][]0[]0[]0[]0[]para[][]0[]0[]0[]0[]0[]0[]para[][]"
+			} ) {
+				name: "panel1"
+				add( new FormComponent( "javax.swing.JLabel" ) {
+					name: "options1Label"
+					"text": "NSOpenPanel options:"
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 0"
+				} )
+				add( new FormComponent( "javax.swing.JCheckBox" ) {
+					name: "canChooseFilesCheckBox"
+					"text": "canChooseFiles"
+					"selected": true
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 1"
+				} )
+				add( new FormComponent( "javax.swing.JCheckBox" ) {
+					name: "canChooseDirectoriesCheckBox"
+					"text": "canChooseDirectories"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 2"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "resolvesAliasesCheckBox"
+					"text": "resolvesAliases"
+					"state": enum com.formdev.flatlaf.extras.components.FlatTriStateCheckBox$State SELECTED
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 3"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "allowsMultipleSelectionCheckBox"
+					"text": "allowsMultipleSelection"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 4"
+				} )
+				add( new FormComponent( "javax.swing.JCheckBox" ) {
+					name: "accessoryViewDisclosedCheckBox"
+					"text": "accessoryViewDisclosed"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 5"
+				} )
+				add( new FormComponent( "javax.swing.JLabel" ) {
+					name: "options2Label"
+					"text": "NSOpenPanel and NSSavePanel options:"
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 6"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "showsTagFieldCheckBox"
+					"text": "showsTagField"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 7"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "canCreateDirectoriesCheckBox"
+					"text": "canCreateDirectories"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 8"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "canSelectHiddenExtensionCheckBox"
+					"text": "canSelectHiddenExtension"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 9"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "showsHiddenFilesCheckBox"
+					"text": "showsHiddenFiles"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 10"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "extensionHiddenCheckBox"
+					"text": "extensionHidden"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 11"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "allowsOtherFileTypesCheckBox"
+					"text": "allowsOtherFileTypes"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 12"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "treatsFilePackagesAsDirectoriesCheckBox"
+					"text": "treatsFilePackagesAsDirectories"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 13"
+				} )
+				add( new FormComponent( "javax.swing.JLabel" ) {
+					name: "options3Label"
+					"text": "Custom options:"
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 14"
+				} )
+				add( new FormComponent( "javax.swing.JCheckBox" ) {
+					name: "showSingleFilterFieldCheckBox"
+					"text": "showSingleFilterField"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 15"
+				} )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 2 1 1 10,aligny top,growy 0"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "promptLabel"
+				"text": "prompt"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 2"
+			} )
+			add( new FormComponent( "javax.swing.JTextField" ) {
+				name: "promptField"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 2"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "messageLabel"
+				"text": "message"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 3"
+			} )
+			add( new FormComponent( "javax.swing.JTextField" ) {
+				name: "messageField"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 3"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "filterFieldLabelLabel"
+				"text": "filterFieldLabel"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 4"
+			} )
+			add( new FormComponent( "javax.swing.JTextField" ) {
+				name: "filterFieldLabelField"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 4"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "nameFieldLabelLabel"
+				"text": "nameFieldLabel"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 5"
+			} )
+			add( new FormComponent( "javax.swing.JTextField" ) {
+				name: "nameFieldLabelField"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 5"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "nameFieldStringValueLabel"
+				"text": "nameFieldStringValue"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 6"
+			} )
+			add( new FormComponent( "javax.swing.JTextField" ) {
+				name: "nameFieldStringValueField"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 6"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "directoryURLLabel"
+				"text": "directoryURL"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 7"
+			} )
+			add( new FormComponent( "javax.swing.JTextField" ) {
+				name: "directoryURLField"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 7"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "fileTypesLabel"
+				"text": "fileTypes"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 8"
+			} )
+			add( new FormComponent( "javax.swing.JComboBox" ) {
+				name: "fileTypesField"
+				"editable": true
+				"model": new javax.swing.DefaultComboBoxModel {
+					selectedItem: "Text Files,txt,null"
+					addElement( "Text Files,txt,null" )
+					addElement( "All Files,*,null" )
+					addElement( "Text Files,txt,null,PDF Files,pdf,null,All Files,*,null" )
+					addElement( "Text and PDF Files,txt,pdf,null" )
+					addElement( "Compressed,zip,gz,null,Disk Images,dmg,null" )
+				}
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 8"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "fileTypeIndexLabel"
+				"text": "fileTypeIndex"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 9"
+			} )
+			add( new FormComponent( "javax.swing.JSlider" ) {
+				name: "fileTypeIndexSlider"
+				"maximum": 10
+				"majorTickSpacing": 1
+				"value": 0
+				"paintLabels": true
+				"snapToTicks": true
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 9"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "openButton"
+				"text": "Open..."
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "open", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 11 3 1"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "saveButton"
+				"text": "Save..."
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "save", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 11 3 1"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "openDirectButton"
+				"text": "Open (no-thread)..."
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "openDirect", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 11 3 1"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "saveDirectButton"
+				"text": "Save (no-thread)..."
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "saveDirect", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 11 3 1"
+			} )
+			add( new FormComponent( "javax.swing.JCheckBox" ) {
+				name: "showMessageDialogOnOKCheckBox"
+				"text": "show message dialog on OK"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 11 3 1"
+			} )
+			add( new FormContainer( "javax.swing.JScrollPane", new FormLayoutManager( class javax.swing.JScrollPane ) ) {
+				name: "filesScrollPane"
+				add( new FormComponent( "javax.swing.JTextArea" ) {
+					name: "filesField"
+					"rows": 8
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				} )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 12 3 1,growx"
+			} )
+		}, new FormLayoutConstraints( null ) {
+			"location": new java.awt.Point( 0, 0 )
+			"size": new java.awt.Dimension( 750, 565 )
+		} )
+		add( new FormNonVisual( "javax.swing.ButtonGroup" ) {
+			name: "ownerButtonGroup"
+		}, new FormLayoutConstraints( null ) {
+			"location": new java.awt.Point( 0, 575 )
+		} )
+		add( new FormContainer( "javax.swing.JMenuBar", new FormLayoutManager( class javax.swing.JMenuBar ) ) {
+			name: "menuBar1"
+			auxiliary() {
+				"JavaCodeGenerator.variableModifiers": 10
+				"JavaCodeGenerator.variableLocal": false
+			}
+			add( new FormContainer( "javax.swing.JMenu", new FormLayoutManager( class javax.swing.JMenu ) ) {
+				name: "menu1"
+				"text": "text"
+				add( new FormComponent( "javax.swing.JMenuItem" ) {
+					name: "menuItem1"
+					"text": "text"
+					addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "menuItemAction", false ) )
+				} )
+				add( new FormComponent( "javax.swing.JMenuItem" ) {
+					name: "menuItem2"
+					"text": "text"
+					addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "menuItemAction", false ) )
+				} )
+			} )
+			add( new FormContainer( "javax.swing.JMenu", new FormLayoutManager( class javax.swing.JMenu ) ) {
+				name: "menu2"
+				"text": "text"
+				add( new FormComponent( "javax.swing.JMenuItem" ) {
+					name: "menuItem3"
+					"text": "text"
+					addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "menuItemAction", false ) )
+				} )
+				add( new FormComponent( "javax.swing.JMenuItem" ) {
+					name: "menuItem4"
+					"text": "text"
+					addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "menuItemAction", false ) )
+				} )
+			} )
+		}, new FormLayoutConstraints( null ) {
+			"location": new java.awt.Point( 0, 630 )
+			"size": new java.awt.Dimension( 76, 24 )
+		} )
+	}
+}

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatSystemFileChooserTest.jfd

@@ -0,0 +1,521 @@
+JFDML JFormDesigner: "8.3" encoding: "UTF-8"
+
+new FormModel {
+	contentType: "form/swing"
+	root: new FormRoot {
+		auxiliary() {
+			"JavaCodeGenerator.defaultVariableLocal": true
+		}
+		add( new FormContainer( "com.formdev.flatlaf.testing.FlatTestPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
+			"$layoutConstraints": "ltr,insets dialog,hidemode 3"
+			"$columnConstraints": "[left][grow,fill][fill]"
+			"$rowConstraints": "[][][][][][][][][][grow,fill]"
+		} ) {
+			name: "this"
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "ownerLabel"
+				"text": "owner"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 0"
+			} )
+			add( new FormComponent( "javax.swing.JRadioButton" ) {
+				name: "ownerFrameRadioButton"
+				"text": "JFrame"
+				"selected": true
+				"$buttonGroup": new FormReference( "ownerButtonGroup" )
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 0"
+			} )
+			add( new FormComponent( "javax.swing.JRadioButton" ) {
+				name: "ownerDialogRadioButton"
+				"text": "JDialog"
+				"$buttonGroup": new FormReference( "ownerButtonGroup" )
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 0"
+			} )
+			add( new FormComponent( "javax.swing.JRadioButton" ) {
+				name: "ownerNullRadioButton"
+				"text": "null"
+				"$buttonGroup": new FormReference( "ownerButtonGroup" )
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 0"
+			} )
+			add( new FormComponent( "com.jformdesigner.designer.wrapper.HSpacer" ) {
+				name: "ownerSpacer"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 0,growx"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "dialogTitleLabel"
+				"text": "dialogTitle"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 1"
+			} )
+			add( new FormComponent( "javax.swing.JTextField" ) {
+				name: "dialogTitleField"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 1"
+			} )
+			add( new FormContainer( "javax.swing.JPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
+				"$layoutConstraints": "insets 2,hidemode 3"
+				"$columnConstraints": "[left]"
+				"$rowConstraints": "[]0[]0[][]para[][]"
+			} ) {
+				name: "panel1"
+				add( new FormComponent( "javax.swing.JCheckBox" ) {
+					name: "directorySelectionCheckBox"
+					"text": "directorySelection"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 0"
+				} )
+				add( new FormComponent( "javax.swing.JCheckBox" ) {
+					name: "multiSelectionEnabledCheckBox"
+					"text": "multiSelectionEnabled"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 1"
+				} )
+				add( new FormComponent( "javax.swing.JCheckBox" ) {
+					name: "useFileHidingCheckBox"
+					"text": "useFileHiding"
+					"selected": true
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 2"
+				} )
+				add( new FormComponent( "javax.swing.JCheckBox" ) {
+					name: "useSystemFileChooserCheckBox"
+					"text": "use SystemFileChooser"
+					"selected": true
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 3"
+				} )
+				add( new FormComponent( "javax.swing.JCheckBox" ) {
+					name: "persistStateCheckBox"
+					"text": "persist state"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+					addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "persistStateChanged", false ) )
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 4"
+				} )
+				add( new FormComponent( "javax.swing.JLabel" ) {
+					name: "stateStoreIDLabel"
+					"text": "ID:"
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 5"
+				} )
+				add( new FormComponent( "javax.swing.JComboBox" ) {
+					name: "stateStoreIDField"
+					"model": new javax.swing.DefaultComboBoxModel {
+						selectedItem: "abc"
+						addElement( "abc" )
+						addElement( "def" )
+					}
+					"editable": true
+					"selectedIndex": -1
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 5,growx"
+				} )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 2 1 1 7,aligny top,growy 0"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "approveButtonTextLabel"
+				"text": "approveButtonText"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 2"
+			} )
+			add( new FormComponent( "javax.swing.JTextField" ) {
+				name: "approveButtonTextField"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 2,growx"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "approveButtonMnemonicLabel"
+				"text": "approveButtonMnemonic"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 2"
+			} )
+			add( new FormComponent( "javax.swing.JTextField" ) {
+				name: "approveButtonMnemonicField"
+				"columns": 3
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 2"
+			} )
+			add( new FormComponent( "javax.swing.JCheckBox" ) {
+				name: "currentDirCheckBox"
+				"text": "current directory"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "currentDirChanged", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 3"
+			} )
+			add( new FormComponent( "javax.swing.JTextField" ) {
+				name: "currentDirField"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 3,growx"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "currentDirChooseButton"
+				"text": "..."
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "chooseCurrentDir", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 3"
+			} )
+			add( new FormComponent( "javax.swing.JCheckBox" ) {
+				name: "selectedFileCheckBox"
+				"text": "selected file"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "selectedFileChanged", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 4"
+			} )
+			add( new FormComponent( "javax.swing.JTextField" ) {
+				name: "selectedFileField"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 4,growx"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "selectedFileChooseButton"
+				"text": "..."
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "chooseSelectedFile", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 4"
+			} )
+			add( new FormComponent( "javax.swing.JCheckBox" ) {
+				name: "selectedFilesCheckBox"
+				"text": "selected files"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "selectedFilesChanged", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 5"
+			} )
+			add( new FormComponent( "javax.swing.JTextField" ) {
+				name: "selectedFilesField"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 5,growx"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "selectedFilesChooseButton"
+				"text": "..."
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "chooseSelectedFiles", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 5"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "fileTypesLabel"
+				"text": "fileTypes"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 6"
+			} )
+			add( new FormComponent( "javax.swing.JComboBox" ) {
+				name: "fileTypesField"
+				"editable": true
+				"model": new javax.swing.DefaultComboBoxModel {
+					selectedItem: "Text Files,txt"
+					addElement( "Text Files,txt" )
+					addElement( "All Files,*" )
+					addElement( "Text Files,txt,PDF Files,pdf,All Files,*" )
+					addElement( "Text and PDF Files,txt;pdf" )
+				}
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 6"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "fileTypeIndexLabel"
+				"text": "fileTypeIndex"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 7"
+			} )
+			add( new FormComponent( "javax.swing.JSlider" ) {
+				name: "fileTypeIndexSlider"
+				"maximum": 10
+				"majorTickSpacing": 1
+				"value": 0
+				"paintLabels": true
+				"snapToTicks": true
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 7,growx"
+			} )
+			add( new FormComponent( "javax.swing.JCheckBox" ) {
+				name: "useAcceptAllFileFilterCheckBox"
+				"text": "useAcceptAllFileFilter"
+				"selected": true
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 7"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "openButton"
+				"text": "Open..."
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "open", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 8 3 1"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "saveButton"
+				"text": "Save..."
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "save", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 8 3 1"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "swingOpenButton"
+				"text": "Swing Open..."
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "swingOpen", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 8 3 1"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "swingSaveButton"
+				"text": "Swing Save..."
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "swingSave", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 8 3 1"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "awtOpenButton"
+				"text": "AWT Open..."
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "awtOpen", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 8 3 1"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "awtSaveButton"
+				"text": "AWT Save..."
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "awtSave", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 8 3 1"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "javafxOpenButton"
+				"text": "JavaFX Open..."
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "javafxOpen", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 8 3 1"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "javafxSaveButton"
+				"text": "JavaFX Save..."
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "javafxSave", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 8 3 1"
+			} )
+			add( new FormContainer( "javax.swing.JScrollPane", new FormLayoutManager( class javax.swing.JScrollPane ) ) {
+				name: "outputScrollPane"
+				add( new FormComponent( "javax.swing.JTextArea" ) {
+					name: "outputField"
+					"rows": 20
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				} )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 9 3 1,growx"
+			} )
+		}, new FormLayoutConstraints( null ) {
+			"location": new java.awt.Point( 0, 0 )
+			"size": new java.awt.Dimension( 825, 465 )
+		} )
+		add( new FormContainer( "javax.swing.JMenuBar", new FormLayoutManager( class javax.swing.JMenuBar ) ) {
+			name: "menuBar1"
+			auxiliary() {
+				"JavaCodeGenerator.variableModifiers": 10
+				"JavaCodeGenerator.variableLocal": false
+			}
+			add( new FormContainer( "javax.swing.JMenu", new FormLayoutManager( class javax.swing.JMenu ) ) {
+				name: "menu1"
+				"text": "text"
+				add( new FormComponent( "javax.swing.JMenuItem" ) {
+					name: "menuItem1"
+					"text": "text"
+					addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "menuItemAction", false ) )
+				} )
+				add( new FormComponent( "javax.swing.JMenuItem" ) {
+					name: "menuItem2"
+					"text": "text"
+					addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "menuItemAction", false ) )
+				} )
+			} )
+			add( new FormContainer( "javax.swing.JMenu", new FormLayoutManager( class javax.swing.JMenu ) ) {
+				name: "menu2"
+				"text": "text"
+				add( new FormComponent( "javax.swing.JMenuItem" ) {
+					name: "menuItem3"
+					"text": "text"
+					addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "menuItemAction", false ) )
+				} )
+				add( new FormComponent( "javax.swing.JMenuItem" ) {
+					name: "menuItem4"
+					"text": "text"
+					addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "menuItemAction", false ) )
+				} )
+			} )
+		}, new FormLayoutConstraints( null ) {
+			"location": new java.awt.Point( 10, 570 )
+		} )
+		add( new FormWindow( "javax.swing.JDialog", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
+			"$layoutConstraints": "hidemode 3"
+			"$columnConstraints": "[fill][fill]"
+			"$rowConstraints": "[]0[]0[]0[][]para[][198]"
+		} ) {
+			name: "dialog1"
+			"title": "Dummy Modal Dialog"
+			"modalityType": enum java.awt.Dialog$ModalityType APPLICATION_MODAL
+			"defaultCloseOperation": 2
+			auxiliary() {
+				"JavaCodeGenerator.className": "DummyModalDialog"
+			}
+			addEvent( new FormEvent( "java.awt.event.WindowListener", "windowOpened", "windowOpened", false ) )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "label1"
+				"text": "Modality type:"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 0"
+			} )
+			add( new FormComponent( "javax.swing.JRadioButton" ) {
+				name: "applicationRadioButton"
+				"text": "Application"
+				"selected": true
+				"$buttonGroup": new FormReference( "modalityTypeButtonGroup" )
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "modalityTypeChanged", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 0"
+			} )
+			add( new FormComponent( "javax.swing.JRadioButton" ) {
+				name: "documentRadioButton"
+				"text": "Document"
+				"$buttonGroup": new FormReference( "modalityTypeButtonGroup" )
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "modalityTypeChanged", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 1"
+			} )
+			add( new FormComponent( "javax.swing.JRadioButton" ) {
+				name: "toolkitRadioButton"
+				"text": "Toolkit"
+				"$buttonGroup": new FormReference( "modalityTypeButtonGroup" )
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "modalityTypeChanged", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 2"
+			} )
+			add( new FormComponent( "javax.swing.JRadioButton" ) {
+				name: "modelessRadioButton"
+				"text": "modeless"
+				"$buttonGroup": new FormReference( "modalityTypeButtonGroup" )
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "modalityTypeChanged", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 3"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "showModalDialogButton"
+				"text": "Show Modal Dialog..."
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "showModalDialog", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 4 2 1"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "showFileDialogButton"
+				"text": "Show File Dialog..."
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "showFileDialog", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 5 2 1"
+			} )
+		}, new FormLayoutConstraints( null ) {
+			"location": new java.awt.Point( 20, 635 )
+			"size": new java.awt.Dimension( 290, 465 )
+		} )
+		add( new FormNonVisual( "javax.swing.ButtonGroup" ) {
+			name: "ownerButtonGroup"
+		}, new FormLayoutConstraints( null ) {
+			"location": new java.awt.Point( 0, 475 )
+		} )
+		add( new FormNonVisual( "javax.swing.ButtonGroup" ) {
+			name: "modalityTypeButtonGroup"
+		}, new FormLayoutConstraints( null ) {
+			"location": new java.awt.Point( 115, 575 )
+		} )
+	}
+}

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatSystemFileChooserWindowsTest.java

@@ -0,0 +1,622 @@
+/*
+ * Copyright 2024 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.testing;
+
+import static com.formdev.flatlaf.ui.FlatNativeWindowsLibrary.*;
+import java.awt.EventQueue;
+import java.awt.Font;
+import java.awt.SecondaryLoop;
+import java.awt.Toolkit;
+import java.awt.Window;
+import java.util.Arrays;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.prefs.Preferences;
+import javax.swing.*;
+import javax.swing.border.TitledBorder;
+import com.formdev.flatlaf.demo.DemoPrefs;
+import com.formdev.flatlaf.extras.components.*;
+import com.formdev.flatlaf.extras.components.FlatTriStateCheckBox.State;
+import com.formdev.flatlaf.testing.FlatSystemFileChooserTest.DummyModalDialog;
+import com.formdev.flatlaf.ui.FlatNativeWindowsLibrary;
+import net.miginfocom.swing.*;
+
+/**
+ * @author Karl Tauber
+ */
+public class FlatSystemFileChooserWindowsTest
+	extends FlatTestPanel
+{
+	public static void main( String[] args ) {
+		SwingUtilities.invokeLater( () -> {
+			if( !FlatNativeWindowsLibrary.isLoaded() ) {
+				JOptionPane.showMessageDialog( null, "FlatLaf native library not loaded" );
+				return;
+			}
+
+			FlatTestFrame frame = FlatTestFrame.create( args, "FlatSystemFileChooserWindowsTest" );
+			FlatSystemFileChooserTest.addListeners( frame );
+			frame.showFrame( FlatSystemFileChooserWindowsTest::new );
+		} );
+	}
+
+	FlatSystemFileChooserWindowsTest() {
+		initComponents();
+
+		fileTypesField.setSelectedItem( null );
+
+		Preferences state = DemoPrefs.getState();
+		messageField.setText( state.get( "systemfilechooser.windows.message", "some message" ) );
+		buttonsField.setText( state.get( "systemfilechooser.windows.buttons", "OK" ) );
+	}
+
+	private void open() {
+		openOrSave( true, false );
+	}
+
+	private void save() {
+		openOrSave( false, false );
+	}
+
+	private void openDirect() {
+		openOrSave( true, true );
+	}
+
+	private void saveDirect() {
+		openOrSave( false, true );
+	}
+
+	private void openOrSave( boolean open, boolean direct ) {
+		Window frame = SwingUtilities.windowForComponent( this );
+		if( ownerFrameRadioButton.isSelected() )
+			openOrSave( open, direct, frame );
+		else if( ownerDialogRadioButton.isSelected() )
+			new DummyModalDialog( frame, owner -> openOrSave( open, direct, owner ) ).setVisible( true );
+		else
+			openOrSave( open, direct, null );
+	}
+
+	private void openOrSave( boolean open, boolean direct, Window owner ) {
+		String title = n( titleField.getText() );
+		String okButtonLabel = n( okButtonLabelField.getText() );
+		String fileNameLabel = n( fileNameLabelField.getText() );
+		String fileName = n( fileNameField.getText() );
+		String folder = n( folderField.getText() );
+		String saveAsItem = n( saveAsItemField.getText() );
+		String defaultFolder = n( defaultFolderField.getText() );
+		String defaultExtension = n( defaultExtensionField.getText() );
+		AtomicInteger optionsSet = new AtomicInteger();
+		AtomicInteger optionsClear = new AtomicInteger();
+
+		o( FOS_OVERWRITEPROMPT, overwritePromptCheckBox, optionsSet, optionsClear );
+		o( FOS_STRICTFILETYPES, strictFileTypesCheckBox, optionsSet, optionsClear );
+		o( FOS_NOCHANGEDIR, noChangeDirCheckBox, optionsSet, optionsClear );
+		o( FOS_PICKFOLDERS, pickFoldersCheckBox, optionsSet, optionsClear );
+		o( FOS_FORCEFILESYSTEM, forceFileSystemCheckBox, optionsSet, optionsClear );
+		o( FOS_ALLNONSTORAGEITEMS, allNonStorageItemsCheckBox, optionsSet, optionsClear );
+		o( FOS_NOVALIDATE, noValidateCheckBox, optionsSet, optionsClear );
+		o( FOS_ALLOWMULTISELECT, allowMultiSelectCheckBox, optionsSet, optionsClear );
+		o( FOS_PATHMUSTEXIST, pathMustExistCheckBox, optionsSet, optionsClear );
+		o( FOS_FILEMUSTEXIST, fileMustExistCheckBox, optionsSet, optionsClear );
+		o( FOS_CREATEPROMPT, createPromptCheckBox, optionsSet, optionsClear );
+		o( FOS_SHAREAWARE, shareAwareCheckBox, optionsSet, optionsClear );
+		o( FOS_NOREADONLYRETURN, noReadOnlyReturnCheckBox, optionsSet, optionsClear );
+		o( FOS_NOTESTFILECREATE, noTestFileCreateCheckBox, optionsSet, optionsClear );
+		o( FOS_HIDEMRUPLACES, hideMruPlacesCheckBox, optionsSet, optionsClear );
+		o( FOS_HIDEPINNEDPLACES, hidePinnedPlacesCheckBox, optionsSet, optionsClear );
+		o( FOS_NODEREFERENCELINKS, noDereferenceLinksCheckBox, optionsSet, optionsClear );
+		o( FOS_OKBUTTONNEEDSINTERACTION, okButtonNeedsInteractionCheckBox, optionsSet, optionsClear );
+		o( FOS_DONTADDTORECENT, dontAddToRecentCheckBox, optionsSet, optionsClear );
+		o( FOS_FORCESHOWHIDDEN, forceShowHiddenCheckBox, optionsSet, optionsClear );
+		o( FOS_DEFAULTNOMINIMODE, defaultNoMiniModeCheckBox, optionsSet, optionsClear );
+		o( FOS_FORCEPREVIEWPANEON, forcePreviewPaneonCheckBox, optionsSet, optionsClear );
+		o( FOS_SUPPORTSTREAMABLEITEMS, supportStreamableItemsCheckBox, optionsSet, optionsClear );
+
+		String fileTypesStr = n( (String) fileTypesField.getSelectedItem() );
+		String[] fileTypes = {};
+		if( fileTypesStr != null )
+			fileTypes = fileTypesStr.trim().split( "[,]+" );
+		int fileTypeIndex = fileTypeIndexSlider.getValue();
+
+		FlatNativeWindowsLibrary.FileChooserCallback callback = (files, hwndFileDialog) -> {
+			System.out.println( "  -- callback " + hwndFileDialog + "  " + Arrays.toString( files ) );
+			if( showMessageDialogOnOKCheckBox.isSelected() ) {
+				System.out.println( FlatNativeWindowsLibrary.showMessageDialog( hwndFileDialog,
+					JOptionPane.INFORMATION_MESSAGE,
+					null, "some text", 1, "Yes", "No" ) );
+			}
+			return true;
+		};
+
+		if( direct ) {
+			String[] files = FlatNativeWindowsLibrary.showFileChooser( owner, open,
+				title, okButtonLabel, fileNameLabel, fileName,
+				folder, saveAsItem, defaultFolder, defaultExtension,
+				optionsSet.get(), optionsClear.get(), callback, fileTypeIndex, fileTypes );
+
+			filesField.setText( (files != null) ? Arrays.toString( files ).replace( ',', '\n' ) : "null" );
+		} else {
+			SecondaryLoop secondaryLoop = Toolkit.getDefaultToolkit().getSystemEventQueue().createSecondaryLoop();
+
+			String[] fileTypes2 = fileTypes;
+			new Thread( () -> {
+				String[] files = FlatNativeWindowsLibrary.showFileChooser( owner, open,
+					title, okButtonLabel, fileNameLabel, fileName,
+					folder, saveAsItem, defaultFolder, defaultExtension,
+					optionsSet.get(), optionsClear.get(), callback, fileTypeIndex, fileTypes2 );
+
+				System.out.println( "    secondaryLoop.exit() returned " + secondaryLoop.exit() );
+
+				EventQueue.invokeLater( () -> {
+					filesField.setText( (files != null) ? Arrays.toString( files ).replace( ',', '\n' ) : "null" );
+				} );
+			} ).start();
+
+			System.out.println( "---- enter secondary loop ----" );
+			System.out.println( "---- secondary loop exited (secondaryLoop.enter() returned " + secondaryLoop.enter() + ") ----" );
+		}
+	}
+
+	private static String n( String s ) {
+		return s != null && !s.isEmpty() ? s : null;
+	}
+
+	private static void o( int option, FlatTriStateCheckBox checkBox, AtomicInteger optionsSet, AtomicInteger optionsClear ) {
+		if( checkBox.getState() == State.SELECTED )
+			optionsSet.set( optionsSet.get() | option );
+		else if( checkBox.getState() == State.UNSELECTED )
+			optionsClear.set( optionsClear.get() | option );
+	}
+
+	private void messageDialog() {
+		long hwnd = getHWND( SwingUtilities.windowForComponent( this ) );
+		String message = messageField.getText();
+		String[] buttons = buttonsField.getText().trim().split( "[,]+" );
+
+		Preferences state = DemoPrefs.getState();
+		state.put( "systemfilechooser.windows.message", message );
+		state.put( "systemfilechooser.windows.buttons", buttonsField.getText() );
+
+		System.out.println( FlatNativeWindowsLibrary.showMessageDialog( hwnd,
+			JOptionPane.WARNING_MESSAGE, null, message, 1, buttons ) );
+	}
+
+	private void messageBox() {
+		long hwnd = getHWND( SwingUtilities.windowForComponent( this ) );
+		String message = messageField.getText();
+
+		System.out.println( FlatNativeWindowsLibrary.showMessageBox( hwnd, message, null,
+			/* MB_ICONINFORMATION */ 0x00000040 | /* MB_YESNO */ 0x00000004 ) );
+	}
+
+	private void initComponents() {
+		// JFormDesigner - Component initialization - DO NOT MODIFY  //GEN-BEGIN:initComponents
+		JLabel ownerLabel = new JLabel();
+		ownerFrameRadioButton = new JRadioButton();
+		ownerDialogRadioButton = new JRadioButton();
+		ownerNullRadioButton = new JRadioButton();
+		JPanel ownerSpacer = new JPanel(null);
+		JLabel titleLabel = new JLabel();
+		titleField = new JTextField();
+		JPanel panel1 = new JPanel();
+		overwritePromptCheckBox = new FlatTriStateCheckBox();
+		pathMustExistCheckBox = new FlatTriStateCheckBox();
+		noDereferenceLinksCheckBox = new FlatTriStateCheckBox();
+		strictFileTypesCheckBox = new FlatTriStateCheckBox();
+		fileMustExistCheckBox = new FlatTriStateCheckBox();
+		okButtonNeedsInteractionCheckBox = new FlatTriStateCheckBox();
+		noChangeDirCheckBox = new FlatTriStateCheckBox();
+		createPromptCheckBox = new FlatTriStateCheckBox();
+		dontAddToRecentCheckBox = new FlatTriStateCheckBox();
+		pickFoldersCheckBox = new FlatTriStateCheckBox();
+		shareAwareCheckBox = new FlatTriStateCheckBox();
+		forceShowHiddenCheckBox = new FlatTriStateCheckBox();
+		forceFileSystemCheckBox = new FlatTriStateCheckBox();
+		noReadOnlyReturnCheckBox = new FlatTriStateCheckBox();
+		defaultNoMiniModeCheckBox = new FlatTriStateCheckBox();
+		allNonStorageItemsCheckBox = new FlatTriStateCheckBox();
+		noTestFileCreateCheckBox = new FlatTriStateCheckBox();
+		forcePreviewPaneonCheckBox = new FlatTriStateCheckBox();
+		noValidateCheckBox = new FlatTriStateCheckBox();
+		hideMruPlacesCheckBox = new FlatTriStateCheckBox();
+		supportStreamableItemsCheckBox = new FlatTriStateCheckBox();
+		allowMultiSelectCheckBox = new FlatTriStateCheckBox();
+		hidePinnedPlacesCheckBox = new FlatTriStateCheckBox();
+		JPanel messageDialogPanel = new JPanel();
+		JLabel messageLabel = new JLabel();
+		JScrollPane messageScrollPane = new JScrollPane();
+		messageField = new JTextArea();
+		JLabel buttonsLabel = new JLabel();
+		buttonsField = new JTextField();
+		JLabel okButtonLabelLabel = new JLabel();
+		okButtonLabelField = new JTextField();
+		JLabel fileNameLabelLabel = new JLabel();
+		fileNameLabelField = new JTextField();
+		JLabel fileNameLabel = new JLabel();
+		fileNameField = new JTextField();
+		JLabel folderLabel = new JLabel();
+		folderField = new JTextField();
+		JLabel saveAsItemLabel = new JLabel();
+		saveAsItemField = new JTextField();
+		JLabel defaultFolderLabel = new JLabel();
+		defaultFolderField = new JTextField();
+		JLabel defaultExtensionLabel = new JLabel();
+		defaultExtensionField = new JTextField();
+		JLabel fileTypesLabel = new JLabel();
+		fileTypesField = new JComboBox<>();
+		JLabel fileTypeIndexLabel = new JLabel();
+		fileTypeIndexSlider = new JSlider();
+		JButton openButton = new JButton();
+		JButton saveButton = new JButton();
+		JButton openDirectButton = new JButton();
+		JButton saveDirectButton = new JButton();
+		showMessageDialogOnOKCheckBox = new JCheckBox();
+		JPanel hSpacer1 = new JPanel(null);
+		JButton messageDialogButton = new JButton();
+		JButton messageBoxButton = new JButton();
+		JScrollPane filesScrollPane = new JScrollPane();
+		filesField = new JTextArea();
+
+		//======== this ========
+		setLayout(new MigLayout(
+			"ltr,insets dialog,hidemode 3",
+			// columns
+			"[left]" +
+			"[grow,fill]" +
+			"[fill]",
+			// rows
+			"[]" +
+			"[]" +
+			"[]" +
+			"[]" +
+			"[]" +
+			"[]" +
+			"[]" +
+			"[]" +
+			"[]" +
+			"[]" +
+			"[]" +
+			"[]" +
+			"[grow,fill]"));
+
+		//---- ownerLabel ----
+		ownerLabel.setText("owner");
+		add(ownerLabel, "cell 0 0");
+
+		//---- ownerFrameRadioButton ----
+		ownerFrameRadioButton.setText("JFrame");
+		ownerFrameRadioButton.setSelected(true);
+		add(ownerFrameRadioButton, "cell 1 0");
+
+		//---- ownerDialogRadioButton ----
+		ownerDialogRadioButton.setText("JDialog");
+		add(ownerDialogRadioButton, "cell 1 0");
+
+		//---- ownerNullRadioButton ----
+		ownerNullRadioButton.setText("null");
+		add(ownerNullRadioButton, "cell 1 0");
+		add(ownerSpacer, "cell 1 0,growx");
+
+		//---- titleLabel ----
+		titleLabel.setText("title");
+		add(titleLabel, "cell 0 1");
+		add(titleField, "cell 1 1");
+
+		//======== panel1 ========
+		{
+			panel1.setLayout(new MigLayout(
+				"insets 2,hidemode 3",
+				// columns
+				"[left]para" +
+				"[left]para" +
+				"[left]",
+				// rows
+				"[]0" +
+				"[]0" +
+				"[]0" +
+				"[]" +
+				"[]0" +
+				"[]0" +
+				"[]0" +
+				"[]0" +
+				"[grow]"));
+
+			//---- overwritePromptCheckBox ----
+			overwritePromptCheckBox.setText("overwritePrompt");
+			panel1.add(overwritePromptCheckBox, "cell 0 0");
+
+			//---- pathMustExistCheckBox ----
+			pathMustExistCheckBox.setText("pathMustExist");
+			panel1.add(pathMustExistCheckBox, "cell 1 0");
+
+			//---- noDereferenceLinksCheckBox ----
+			noDereferenceLinksCheckBox.setText("noDereferenceLinks");
+			panel1.add(noDereferenceLinksCheckBox, "cell 2 0");
+
+			//---- strictFileTypesCheckBox ----
+			strictFileTypesCheckBox.setText("strictFileTypes");
+			panel1.add(strictFileTypesCheckBox, "cell 0 1");
+
+			//---- fileMustExistCheckBox ----
+			fileMustExistCheckBox.setText("fileMustExist");
+			panel1.add(fileMustExistCheckBox, "cell 1 1");
+
+			//---- okButtonNeedsInteractionCheckBox ----
+			okButtonNeedsInteractionCheckBox.setText("okButtonNeedsInteraction");
+			panel1.add(okButtonNeedsInteractionCheckBox, "cell 2 1");
+
+			//---- noChangeDirCheckBox ----
+			noChangeDirCheckBox.setText("noChangeDir");
+			panel1.add(noChangeDirCheckBox, "cell 0 2");
+
+			//---- createPromptCheckBox ----
+			createPromptCheckBox.setText("createPrompt");
+			panel1.add(createPromptCheckBox, "cell 1 2");
+
+			//---- dontAddToRecentCheckBox ----
+			dontAddToRecentCheckBox.setText("dontAddToRecent");
+			panel1.add(dontAddToRecentCheckBox, "cell 2 2");
+
+			//---- pickFoldersCheckBox ----
+			pickFoldersCheckBox.setText("pickFolders");
+			pickFoldersCheckBox.setFont(pickFoldersCheckBox.getFont().deriveFont(pickFoldersCheckBox.getFont().getStyle() | Font.BOLD));
+			panel1.add(pickFoldersCheckBox, "cell 0 3");
+
+			//---- shareAwareCheckBox ----
+			shareAwareCheckBox.setText("shareAware");
+			panel1.add(shareAwareCheckBox, "cell 1 3");
+
+			//---- forceShowHiddenCheckBox ----
+			forceShowHiddenCheckBox.setText("forceShowHidden");
+			forceShowHiddenCheckBox.setFont(forceShowHiddenCheckBox.getFont().deriveFont(forceShowHiddenCheckBox.getFont().getStyle() | Font.BOLD));
+			panel1.add(forceShowHiddenCheckBox, "cell 2 3");
+
+			//---- forceFileSystemCheckBox ----
+			forceFileSystemCheckBox.setText("forceFileSystem");
+			panel1.add(forceFileSystemCheckBox, "cell 0 4");
+
+			//---- noReadOnlyReturnCheckBox ----
+			noReadOnlyReturnCheckBox.setText("noReadOnlyReturn");
+			panel1.add(noReadOnlyReturnCheckBox, "cell 1 4");
+
+			//---- defaultNoMiniModeCheckBox ----
+			defaultNoMiniModeCheckBox.setText("defaultNoMiniMode");
+			panel1.add(defaultNoMiniModeCheckBox, "cell 2 4");
+
+			//---- allNonStorageItemsCheckBox ----
+			allNonStorageItemsCheckBox.setText("allNonStorageItems");
+			panel1.add(allNonStorageItemsCheckBox, "cell 0 5");
+
+			//---- noTestFileCreateCheckBox ----
+			noTestFileCreateCheckBox.setText("noTestFileCreate");
+			panel1.add(noTestFileCreateCheckBox, "cell 1 5");
+
+			//---- forcePreviewPaneonCheckBox ----
+			forcePreviewPaneonCheckBox.setText("forcePreviewPaneon");
+			panel1.add(forcePreviewPaneonCheckBox, "cell 2 5");
+
+			//---- noValidateCheckBox ----
+			noValidateCheckBox.setText("noValidate");
+			panel1.add(noValidateCheckBox, "cell 0 6");
+
+			//---- hideMruPlacesCheckBox ----
+			hideMruPlacesCheckBox.setText("hideMruPlaces");
+			panel1.add(hideMruPlacesCheckBox, "cell 1 6");
+
+			//---- supportStreamableItemsCheckBox ----
+			supportStreamableItemsCheckBox.setText("supportStreamableItems");
+			panel1.add(supportStreamableItemsCheckBox, "cell 2 6");
+
+			//---- allowMultiSelectCheckBox ----
+			allowMultiSelectCheckBox.setText("allowMultiSelect");
+			allowMultiSelectCheckBox.setFont(allowMultiSelectCheckBox.getFont().deriveFont(allowMultiSelectCheckBox.getFont().getStyle() | Font.BOLD));
+			panel1.add(allowMultiSelectCheckBox, "cell 0 7");
+
+			//---- hidePinnedPlacesCheckBox ----
+			hidePinnedPlacesCheckBox.setText("hidePinnedPlaces");
+			panel1.add(hidePinnedPlacesCheckBox, "cell 1 7");
+
+			//======== messageDialogPanel ========
+			{
+				messageDialogPanel.setBorder(new TitledBorder("MessageDialog"));
+				messageDialogPanel.setLayout(new MigLayout(
+					"hidemode 3",
+					// columns
+					"[fill]" +
+					"[grow,fill]",
+					// rows
+					"[grow,fill]" +
+					"[]"));
+
+				//---- messageLabel ----
+				messageLabel.setText("Message");
+				messageDialogPanel.add(messageLabel, "cell 0 0,aligny top,growy 0");
+
+				//======== messageScrollPane ========
+				{
+
+					//---- messageField ----
+					messageField.setColumns(40);
+					messageField.setRows(4);
+					messageScrollPane.setViewportView(messageField);
+				}
+				messageDialogPanel.add(messageScrollPane, "cell 1 0");
+
+				//---- buttonsLabel ----
+				buttonsLabel.setText("Buttons:");
+				messageDialogPanel.add(buttonsLabel, "cell 0 1");
+				messageDialogPanel.add(buttonsField, "cell 1 1");
+			}
+			panel1.add(messageDialogPanel, "cell 0 8 3 1,grow");
+		}
+		add(panel1, "cell 2 1 1 10,growy");
+
+		//---- okButtonLabelLabel ----
+		okButtonLabelLabel.setText("okButtonLabel");
+		add(okButtonLabelLabel, "cell 0 2");
+		add(okButtonLabelField, "cell 1 2");
+
+		//---- fileNameLabelLabel ----
+		fileNameLabelLabel.setText("fileNameLabel");
+		add(fileNameLabelLabel, "cell 0 3");
+		add(fileNameLabelField, "cell 1 3");
+
+		//---- fileNameLabel ----
+		fileNameLabel.setText("fileName");
+		add(fileNameLabel, "cell 0 4");
+		add(fileNameField, "cell 1 4");
+
+		//---- folderLabel ----
+		folderLabel.setText("folder");
+		add(folderLabel, "cell 0 5");
+		add(folderField, "cell 1 5");
+
+		//---- saveAsItemLabel ----
+		saveAsItemLabel.setText("saveAsItem");
+		add(saveAsItemLabel, "cell 0 6");
+		add(saveAsItemField, "cell 1 6");
+
+		//---- defaultFolderLabel ----
+		defaultFolderLabel.setText("defaultFolder");
+		add(defaultFolderLabel, "cell 0 7");
+		add(defaultFolderField, "cell 1 7");
+
+		//---- defaultExtensionLabel ----
+		defaultExtensionLabel.setText("defaultExtension");
+		add(defaultExtensionLabel, "cell 0 8");
+		add(defaultExtensionField, "cell 1 8");
+
+		//---- fileTypesLabel ----
+		fileTypesLabel.setText("fileTypes");
+		add(fileTypesLabel, "cell 0 9");
+
+		//---- fileTypesField ----
+		fileTypesField.setEditable(true);
+		fileTypesField.setModel(new DefaultComboBoxModel<>(new String[] {
+			"Text Files,*.txt",
+			"All Files,*.*",
+			"Text Files,*.txt,PDF Files,*.pdf,All Files,*.*",
+			"Text and PDF Files,*.txt;*.pdf"
+		}));
+		add(fileTypesField, "cell 1 9");
+
+		//---- fileTypeIndexLabel ----
+		fileTypeIndexLabel.setText("fileTypeIndex");
+		add(fileTypeIndexLabel, "cell 0 10");
+
+		//---- fileTypeIndexSlider ----
+		fileTypeIndexSlider.setMaximum(10);
+		fileTypeIndexSlider.setMajorTickSpacing(1);
+		fileTypeIndexSlider.setValue(0);
+		fileTypeIndexSlider.setPaintLabels(true);
+		fileTypeIndexSlider.setSnapToTicks(true);
+		add(fileTypeIndexSlider, "cell 1 10");
+
+		//---- openButton ----
+		openButton.setText("Open...");
+		openButton.addActionListener(e -> open());
+		add(openButton, "cell 0 11 3 1");
+
+		//---- saveButton ----
+		saveButton.setText("Save...");
+		saveButton.addActionListener(e -> save());
+		add(saveButton, "cell 0 11 3 1");
+
+		//---- openDirectButton ----
+		openDirectButton.setText("Open (no-thread)...");
+		openDirectButton.addActionListener(e -> openDirect());
+		add(openDirectButton, "cell 0 11 3 1");
+
+		//---- saveDirectButton ----
+		saveDirectButton.setText("Save (no-thread)...");
+		saveDirectButton.addActionListener(e -> saveDirect());
+		add(saveDirectButton, "cell 0 11 3 1");
+
+		//---- showMessageDialogOnOKCheckBox ----
+		showMessageDialogOnOKCheckBox.setText("show message dialog on OK");
+		add(showMessageDialogOnOKCheckBox, "cell 0 11 3 1");
+		add(hSpacer1, "cell 0 11 3 1,growx");
+
+		//---- messageDialogButton ----
+		messageDialogButton.setText("MessageDialog...");
+		messageDialogButton.addActionListener(e -> messageDialog());
+		add(messageDialogButton, "cell 0 11 3 1,alignx right,growx 0");
+
+		//---- messageBoxButton ----
+		messageBoxButton.setText("MessageBox...");
+		messageBoxButton.addActionListener(e -> messageBox());
+		add(messageBoxButton, "cell 0 11 3 1");
+
+		//======== filesScrollPane ========
+		{
+
+			//---- filesField ----
+			filesField.setRows(8);
+			filesScrollPane.setViewportView(filesField);
+		}
+		add(filesScrollPane, "cell 0 12 3 1,growx");
+
+		//---- ownerButtonGroup ----
+		ButtonGroup ownerButtonGroup = new ButtonGroup();
+		ownerButtonGroup.add(ownerFrameRadioButton);
+		ownerButtonGroup.add(ownerDialogRadioButton);
+		ownerButtonGroup.add(ownerNullRadioButton);
+		// JFormDesigner - End of component initialization  //GEN-END:initComponents
+	}
+
+	// JFormDesigner - Variables declaration - DO NOT MODIFY  //GEN-BEGIN:variables
+	private JRadioButton ownerFrameRadioButton;
+	private JRadioButton ownerDialogRadioButton;
+	private JRadioButton ownerNullRadioButton;
+	private JTextField titleField;
+	private FlatTriStateCheckBox overwritePromptCheckBox;
+	private FlatTriStateCheckBox pathMustExistCheckBox;
+	private FlatTriStateCheckBox noDereferenceLinksCheckBox;
+	private FlatTriStateCheckBox strictFileTypesCheckBox;
+	private FlatTriStateCheckBox fileMustExistCheckBox;
+	private FlatTriStateCheckBox okButtonNeedsInteractionCheckBox;
+	private FlatTriStateCheckBox noChangeDirCheckBox;
+	private FlatTriStateCheckBox createPromptCheckBox;
+	private FlatTriStateCheckBox dontAddToRecentCheckBox;
+	private FlatTriStateCheckBox pickFoldersCheckBox;
+	private FlatTriStateCheckBox shareAwareCheckBox;
+	private FlatTriStateCheckBox forceShowHiddenCheckBox;
+	private FlatTriStateCheckBox forceFileSystemCheckBox;
+	private FlatTriStateCheckBox noReadOnlyReturnCheckBox;
+	private FlatTriStateCheckBox defaultNoMiniModeCheckBox;
+	private FlatTriStateCheckBox allNonStorageItemsCheckBox;
+	private FlatTriStateCheckBox noTestFileCreateCheckBox;
+	private FlatTriStateCheckBox forcePreviewPaneonCheckBox;
+	private FlatTriStateCheckBox noValidateCheckBox;
+	private FlatTriStateCheckBox hideMruPlacesCheckBox;
+	private FlatTriStateCheckBox supportStreamableItemsCheckBox;
+	private FlatTriStateCheckBox allowMultiSelectCheckBox;
+	private FlatTriStateCheckBox hidePinnedPlacesCheckBox;
+	private JTextArea messageField;
+	private JTextField buttonsField;
+	private JTextField okButtonLabelField;
+	private JTextField fileNameLabelField;
+	private JTextField fileNameField;
+	private JTextField folderField;
+	private JTextField saveAsItemField;
+	private JTextField defaultFolderField;
+	private JTextField defaultExtensionField;
+	private JComboBox<String> fileTypesField;
+	private JSlider fileTypeIndexSlider;
+	private JCheckBox showMessageDialogOnOKCheckBox;
+	private JTextArea filesField;
+	// JFormDesigner - End of variables declaration  //GEN-END:variables
+}

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatSystemFileChooserWindowsTest.jfd

@@ -0,0 +1,550 @@
+JFDML JFormDesigner: "8.3" encoding: "UTF-8"
+
+new FormModel {
+	contentType: "form/swing"
+	root: new FormRoot {
+		auxiliary() {
+			"JavaCodeGenerator.defaultVariableLocal": true
+		}
+		add( new FormContainer( "com.formdev.flatlaf.testing.FlatTestPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
+			"$layoutConstraints": "ltr,insets dialog,hidemode 3"
+			"$columnConstraints": "[left][grow,fill][fill]"
+			"$rowConstraints": "[][][][][][][][][][][][][grow,fill]"
+		} ) {
+			name: "this"
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "ownerLabel"
+				"text": "owner"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 0"
+			} )
+			add( new FormComponent( "javax.swing.JRadioButton" ) {
+				name: "ownerFrameRadioButton"
+				"text": "JFrame"
+				"selected": true
+				"$buttonGroup": new FormReference( "ownerButtonGroup" )
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 0"
+			} )
+			add( new FormComponent( "javax.swing.JRadioButton" ) {
+				name: "ownerDialogRadioButton"
+				"text": "JDialog"
+				"$buttonGroup": new FormReference( "ownerButtonGroup" )
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 0"
+			} )
+			add( new FormComponent( "javax.swing.JRadioButton" ) {
+				name: "ownerNullRadioButton"
+				"text": "null"
+				"$buttonGroup": new FormReference( "ownerButtonGroup" )
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 0"
+			} )
+			add( new FormComponent( "com.jformdesigner.designer.wrapper.HSpacer" ) {
+				name: "ownerSpacer"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 0,growx"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "titleLabel"
+				"text": "title"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 1"
+			} )
+			add( new FormComponent( "javax.swing.JTextField" ) {
+				name: "titleField"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 1"
+			} )
+			add( new FormContainer( "javax.swing.JPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
+				"$layoutConstraints": "insets 2,hidemode 3"
+				"$columnConstraints": "[left]para[left]para[left]"
+				"$rowConstraints": "[]0[]0[]0[][]0[]0[]0[]0[grow]"
+			} ) {
+				name: "panel1"
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "overwritePromptCheckBox"
+					"text": "overwritePrompt"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 0"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "pathMustExistCheckBox"
+					"text": "pathMustExist"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 1 0"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "noDereferenceLinksCheckBox"
+					"text": "noDereferenceLinks"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 2 0"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "strictFileTypesCheckBox"
+					"text": "strictFileTypes"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 1"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "fileMustExistCheckBox"
+					"text": "fileMustExist"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 1 1"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "okButtonNeedsInteractionCheckBox"
+					"text": "okButtonNeedsInteraction"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 2 1"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "noChangeDirCheckBox"
+					"text": "noChangeDir"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 2"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "createPromptCheckBox"
+					"text": "createPrompt"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 1 2"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "dontAddToRecentCheckBox"
+					"text": "dontAddToRecent"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 2 2"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "pickFoldersCheckBox"
+					"text": "pickFolders"
+					"font": new com.jformdesigner.model.SwingDerivedFont( null, 1, 0, false )
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 3"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "shareAwareCheckBox"
+					"text": "shareAware"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 1 3"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "forceShowHiddenCheckBox"
+					"text": "forceShowHidden"
+					"font": new com.jformdesigner.model.SwingDerivedFont( null, 1, 0, false )
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 2 3"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "forceFileSystemCheckBox"
+					"text": "forceFileSystem"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 4"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "noReadOnlyReturnCheckBox"
+					"text": "noReadOnlyReturn"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 1 4"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "defaultNoMiniModeCheckBox"
+					"text": "defaultNoMiniMode"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 2 4"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "allNonStorageItemsCheckBox"
+					"text": "allNonStorageItems"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 5"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "noTestFileCreateCheckBox"
+					"text": "noTestFileCreate"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 1 5"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "forcePreviewPaneonCheckBox"
+					"text": "forcePreviewPaneon"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 2 5"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "noValidateCheckBox"
+					"text": "noValidate"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 6"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "hideMruPlacesCheckBox"
+					"text": "hideMruPlaces"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 1 6"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "supportStreamableItemsCheckBox"
+					"text": "supportStreamableItems"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 2 6"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "allowMultiSelectCheckBox"
+					"text": "allowMultiSelect"
+					"font": new com.jformdesigner.model.SwingDerivedFont( null, 1, 0, false )
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 7"
+				} )
+				add( new FormComponent( "com.formdev.flatlaf.extras.components.FlatTriStateCheckBox" ) {
+					name: "hidePinnedPlacesCheckBox"
+					"text": "hidePinnedPlaces"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 1 7"
+				} )
+				add( new FormContainer( "javax.swing.JPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
+					"$layoutConstraints": "hidemode 3"
+					"$columnConstraints": "[fill][grow,fill]"
+					"$rowConstraints": "[grow,fill][]"
+				} ) {
+					name: "messageDialogPanel"
+					"border": new javax.swing.border.TitledBorder( "MessageDialog" )
+					add( new FormComponent( "javax.swing.JLabel" ) {
+						name: "messageLabel"
+						"text": "Message"
+					}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+						"value": "cell 0 0,aligny top,growy 0"
+					} )
+					add( new FormContainer( "javax.swing.JScrollPane", new FormLayoutManager( class javax.swing.JScrollPane ) ) {
+						name: "messageScrollPane"
+						add( new FormComponent( "javax.swing.JTextArea" ) {
+							name: "messageField"
+							"columns": 40
+							"rows": 4
+							auxiliary() {
+								"JavaCodeGenerator.variableLocal": false
+							}
+						} )
+					}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+						"value": "cell 1 0"
+					} )
+					add( new FormComponent( "javax.swing.JLabel" ) {
+						name: "buttonsLabel"
+						"text": "Buttons:"
+					}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+						"value": "cell 0 1"
+					} )
+					add( new FormComponent( "javax.swing.JTextField" ) {
+						name: "buttonsField"
+						auxiliary() {
+							"JavaCodeGenerator.variableLocal": false
+						}
+					}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+						"value": "cell 1 1"
+					} )
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 8 3 1,grow"
+				} )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 2 1 1 10,growy"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "okButtonLabelLabel"
+				"text": "okButtonLabel"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 2"
+			} )
+			add( new FormComponent( "javax.swing.JTextField" ) {
+				name: "okButtonLabelField"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 2"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "fileNameLabelLabel"
+				"text": "fileNameLabel"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 3"
+			} )
+			add( new FormComponent( "javax.swing.JTextField" ) {
+				name: "fileNameLabelField"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 3"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "fileNameLabel"
+				"text": "fileName"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 4"
+			} )
+			add( new FormComponent( "javax.swing.JTextField" ) {
+				name: "fileNameField"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 4"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "folderLabel"
+				"text": "folder"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 5"
+			} )
+			add( new FormComponent( "javax.swing.JTextField" ) {
+				name: "folderField"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 5"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "saveAsItemLabel"
+				"text": "saveAsItem"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 6"
+			} )
+			add( new FormComponent( "javax.swing.JTextField" ) {
+				name: "saveAsItemField"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 6"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "defaultFolderLabel"
+				"text": "defaultFolder"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 7"
+			} )
+			add( new FormComponent( "javax.swing.JTextField" ) {
+				name: "defaultFolderField"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 7"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "defaultExtensionLabel"
+				"text": "defaultExtension"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 8"
+			} )
+			add( new FormComponent( "javax.swing.JTextField" ) {
+				name: "defaultExtensionField"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 8"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "fileTypesLabel"
+				"text": "fileTypes"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 9"
+			} )
+			add( new FormComponent( "javax.swing.JComboBox" ) {
+				name: "fileTypesField"
+				"editable": true
+				"model": new javax.swing.DefaultComboBoxModel {
+					selectedItem: "Text Files,*.txt"
+					addElement( "Text Files,*.txt" )
+					addElement( "All Files,*.*" )
+					addElement( "Text Files,*.txt,PDF Files,*.pdf,All Files,*.*" )
+					addElement( "Text and PDF Files,*.txt;*.pdf" )
+				}
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 9"
+			} )
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "fileTypeIndexLabel"
+				"text": "fileTypeIndex"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 10"
+			} )
+			add( new FormComponent( "javax.swing.JSlider" ) {
+				name: "fileTypeIndexSlider"
+				"maximum": 10
+				"majorTickSpacing": 1
+				"value": 0
+				"paintLabels": true
+				"snapToTicks": true
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 10"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "openButton"
+				"text": "Open..."
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "open", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 11 3 1"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "saveButton"
+				"text": "Save..."
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "save", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 11 3 1"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "openDirectButton"
+				"text": "Open (no-thread)..."
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "openDirect", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 11 3 1"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "saveDirectButton"
+				"text": "Save (no-thread)..."
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "saveDirect", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 11 3 1"
+			} )
+			add( new FormComponent( "javax.swing.JCheckBox" ) {
+				name: "showMessageDialogOnOKCheckBox"
+				"text": "show message dialog on OK"
+				auxiliary() {
+					"JavaCodeGenerator.variableLocal": false
+				}
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 11 3 1"
+			} )
+			add( new FormComponent( "com.jformdesigner.designer.wrapper.HSpacer" ) {
+				name: "hSpacer1"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 11 3 1,growx"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "messageDialogButton"
+				"text": "MessageDialog..."
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "messageDialog", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 11 3 1,alignx right,growx 0"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "messageBoxButton"
+				"text": "MessageBox..."
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "messageBox", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 11 3 1"
+			} )
+			add( new FormContainer( "javax.swing.JScrollPane", new FormLayoutManager( class javax.swing.JScrollPane ) ) {
+				name: "filesScrollPane"
+				add( new FormComponent( "javax.swing.JTextArea" ) {
+					name: "filesField"
+					"rows": 8
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+				} )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 12 3 1,growx"
+			} )
+		}, new FormLayoutConstraints( null ) {
+			"location": new java.awt.Point( 0, 0 )
+			"size": new java.awt.Dimension( 890, 630 )
+		} )
+		add( new FormNonVisual( "javax.swing.ButtonGroup" ) {
+			name: "ownerButtonGroup"
+		}, new FormLayoutConstraints( null ) {
+			"location": new java.awt.Point( 0, 640 )
+		} )
+	}
+}

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatTestFrame.java

@@ -245,6 +245,9 @@ public class FlatTestFrame
 		super.dispose();
 
 		FlatUIDefaultsInspector.hide();
+
+		if( getDefaultCloseOperation() == JFrame.EXIT_ON_CLOSE )
+			System.exit( 0 );
 	}
 
 	private void updateTitle() {

flatlaf-theme-editor/src/main/java/com/formdev/flatlaf/themeeditor/FlatThemeFileEditor.java

@@ -74,6 +74,7 @@ import com.formdev.flatlaf.themes.FlatMacDarkLaf;
 import com.formdev.flatlaf.themes.FlatMacLightLaf;
 import com.formdev.flatlaf.ui.FlatUIUtils;
 import com.formdev.flatlaf.util.StringUtils;
+import com.formdev.flatlaf.util.SystemFileChooser;
 import com.formdev.flatlaf.util.SystemInfo;
 import com.formdev.flatlaf.util.UIScale;
 
@@ -97,6 +98,8 @@ class FlatThemeFileEditor
 	private static final String KEY_SHOW_RGB_COLORS = "showRgbColors";
 	private static final String KEY_SHOW_COLOR_LUMA = "showColorLuma";
 
+	private static final int NEW_PROPERTIES_FILE_OPTION = 100;
+
 	private File dir;
 	private Preferences state;
 	private boolean inLoadDirectory;
@@ -228,48 +231,45 @@ class FlatThemeFileEditor
 			return;
 
 		// choose directory
-		JFileChooser chooser = new JFileChooser( dir ) {
+		SystemFileChooser chooser = new SystemFileChooser( dir );
-			@Override
+		chooser.setFileSelectionMode( SystemFileChooser.DIRECTORIES_ONLY );
-			public void approveSelection() {
+		chooser.setApproveCallback( this::checkDirectory );
-				if( !checkDirectory( this, getSelectedFile() ) )
+		int result = chooser.showOpenDialog( this );
-					return;
+		if( result == SystemFileChooser.CANCEL_OPTION )
-
-				super.approveSelection();
-			}
-		};
-		chooser.setFileSelectionMode( JFileChooser.DIRECTORIES_ONLY );
-		if( chooser.showOpenDialog( this ) != JFileChooser.APPROVE_OPTION )
 			return;
 
 		File selectedFile = chooser.getSelectedFile();
 		if( selectedFile == null || selectedFile.equals( dir ) )
 			return;
 
+		if( result == NEW_PROPERTIES_FILE_OPTION ) {
+			if( !newPropertiesFile( selectedFile ) )
+				return;
+		}
+
 		// open new directory
 		loadDirectory( selectedFile );
 	}
 
-	private boolean checkDirectory( Component parentComponent, File dir ) {
+	private int checkDirectory( File[] selectedFiles, SystemFileChooser.ApproveContext context ) {
+		File dir = selectedFiles[0];
 		if( !dir.isDirectory() ) {
-			JOptionPane.showMessageDialog( parentComponent,
+			showMessageDialog( context, "Directory '" + dir + "' does not exist.", null );
-				"Directory '" + dir + "' does not exist.",
+			return SystemFileChooser.CANCEL_OPTION;
-				getTitle(), JOptionPane.INFORMATION_MESSAGE );
-			return false;
 		}
 
 		if( getPropertiesFiles( dir ).length == 0 ) {
 			UIManager.put( "OptionPane.sameSizeButtons", false );
-			int result = JOptionPane.showOptionDialog( parentComponent,
+			int result = showMessageDialog( context,
-				"Directory '" + dir + "' does not contain properties files.\n\n"
+				"Directory '" + dir + "' does not contain properties files.",
-				+ "Do you want create a new theme in this directory?\n\n"
+				"Do you want create a new theme in this directory?\n\n"
 				+ "Or do you want modify/extend core themes and create empty"
 				+ " 'FlatLightLaf.properties' and 'FlatDarkLaf.properties' files in this directory?",
-				getTitle(), JOptionPane.DEFAULT_OPTION, JOptionPane.INFORMATION_MESSAGE, null,
+				"_New Theme", "_Modify Core Themes", "_Cancel" );
-				new Object[] { "New Theme", "Modify Core Themes", "Cancel" }, null );
 			UIManager.put( "OptionPane.sameSizeButtons", null );
 
 			if( result == 0 )
-				return newPropertiesFile( dir );
+				return NEW_PROPERTIES_FILE_OPTION;
 			else if( result == 1 ) {
 				try {
 					String content =
@@ -281,18 +281,37 @@ class FlatThemeFileEditor
 						"\n";
 					writeFile( new File( dir, "FlatLightLaf.properties" ), content );
 					writeFile( new File( dir, "FlatDarkLaf.properties" ), content );
-					return true;
+					return SystemFileChooser.APPROVE_OPTION;
 				} catch( IOException ex ) {
 					ex.printStackTrace();
 
-					JOptionPane.showMessageDialog( parentComponent,
+					showMessageDialog( context,
-						"Failed to create 'FlatLightLaf.properties' or 'FlatDarkLaf.properties'." );
+						"Failed to create 'FlatLightLaf.properties' or 'FlatDarkLaf.properties'.", null );
 				}
 			}
-			return false;
+			return SystemFileChooser.CANCEL_OPTION;
 		}
 
-		return true;
+		return SystemFileChooser.APPROVE_OPTION;
+	}
+
+	private int showMessageDialog( SystemFileChooser.ApproveContext context,
+		String primaryText, String secondaryText, String... buttons )
+	{
+		if( context != null ) {
+			// invoked from SystemFileChooser
+			return context.showMessageDialog( JOptionPane.INFORMATION_MESSAGE,
+				primaryText, secondaryText, 0, buttons );
+		} else {
+			// invoked from directoryChanged()
+			if( secondaryText != null )
+				primaryText = primaryText + "\n\n" + secondaryText;
+			for( int i = 0; i < buttons.length; i++ )
+				buttons[i] = buttons[i].replace( "_", "" );
+			return JOptionPane.showOptionDialog( this, primaryText, getTitle(),
+				JOptionPane.DEFAULT_OPTION, JOptionPane.INFORMATION_MESSAGE, null,
+				(buttons.length > 0) ? buttons : null, null );
+		}
 	}
 
 	private void directoryChanged() {
@@ -303,7 +322,15 @@ class FlatThemeFileEditor
 		if( dir == null )
 			return;
 
-		if( checkDirectory( this, dir ) )
+		directoryField.hidePopup();
+
+		int result = checkDirectory( new File[] { dir }, null );
+		if( result == NEW_PROPERTIES_FILE_OPTION ) {
+			if( !newPropertiesFile( dir ) )
+				return;
+		}
+
+		if( result != SystemFileChooser.CANCEL_OPTION )
 			loadDirectory( dir );
 		else {
 			// remove from directories history
@@ -391,6 +418,9 @@ class FlatThemeFileEditor
 		File[] propertiesFiles = dir.listFiles( (d, name) -> {
 			return name.endsWith( ".properties" );
 		} );
+		if( propertiesFiles == null )
+			propertiesFiles = new File[0];
+
 		Arrays.sort( propertiesFiles, (f1, f2) -> {
 			String n1 = toSortName( f1.getName() );
 			String n2 = toSortName( f2.getName() );

gradle/libs.versions.toml

@@ -44,6 +44,7 @@ fifesoft-autocomplete = "com.fifesoft:autocomplete:3.3.1"
 # flatlaf-testing
 glazedlists = "com.glazedlists:glazedlists:1.11.0"
 netbeans-api-awt = "org.netbeans.api:org-openide-awt:RELEASE112"
+nativejfilechooser = "li.flor:native-j-file-chooser:1.6.4"
 
 # flatlaf-natives-jna
 jna = "net.java.dev.jna:jna:5.15.0"