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TabbedPane:

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- updated comment regarding unsupported scroll buttons in right-to-left component orientation (see issue #815)
- removed unused on wrong code that tries to layout scroll buttons for right-to-left
This commit is contained in:
Karl Tauber
2024-03-13 00:03:05 +01:00
parent 44752cc9aa
commit d26819d268
1 changed files with 17 additions and 8 deletions
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25
flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTabbedPaneUI.java
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@@ -3767,9 +3767,20 @@ debug*/
boolean hideDisabledScrollButtons = (scrollButtonsPolicy == AS_NEEDED_SINGLE && scrollButtonsPlacement == BOTH);
boolean trailingScrollButtons = (scrollButtonsPlacement == TRAILING);
// for right-to-left always use "more tabs" button for horizontal scrolling
// For right-to-left, always use "more tabs" button for horizontal scrolling
// because methods scrollForward() and scrollBackward() in class
// BasicTabbedPaneUI.ScrollableTabSupport do not work for right-to-left
// BasicTabbedPaneUI.ScrollableTabSupport do not work for right-to-left.
//
// One problem is that BasicTabbedPaneUI.getClosestTab(), which is used
// to compute leadingTabIndex, does not work for right-to-left because is uses "binary" search
// on rects[] to find tab, but rects[] is ordered in reverse order for right-to-left.
// So leadingTabIndex is either zero or tabCount.
// Therefore increasing/decreasing leadingTabIndex in scrollForward()
// and scrollBackward() does not work as expected.
// Also backward/forward scroll buttons are not correctly enabled/disabled.
//
// Fixing this would require replacing nearly whole functionality of class
// BasicTabbedPaneUI.ScrollableTabSupport, which is not possible because it is private.
boolean leftToRight = isLeftToRight();
if( !leftToRight && isHorizontalTabPlacement( tabPane.getTabPlacement() ) ) {
useMoreTabsButton = true;
@@ -3863,8 +3874,7 @@ debug*/
// layout forward button on trailing side
if( !hideDisabledScrollButtons || viewSize.width - viewPosition.x > w ) {
int buttonWidth = forwardButton.getPreferredSize().width;
forwardButton.setBounds( leftToRight ? (x + w - buttonWidth) : x, y, buttonWidth, h );
x += leftToRight ? 0 : buttonWidth;
forwardButton.setBounds( x + w - buttonWidth, y, buttonWidth, h );
w -= buttonWidth;
forwardButtonVisible = true;
}
@@ -3874,12 +3884,11 @@ debug*/
int buttonWidth = backwardButton.getPreferredSize().width;
if( trailingScrollButtons ) {
// on trailing side
backwardButton.setBounds( leftToRight ? (x + w - buttonWidth) : x, y, buttonWidth, h );
x += leftToRight ? 0 : buttonWidth;
backwardButton.setBounds( x + w - buttonWidth, y, buttonWidth, h );
} else {
// on leading side
backwardButton.setBounds( leftToRight ? x : (x + w - buttonWidth), y, buttonWidth, h );
x += leftToRight ? buttonWidth : 0;
backwardButton.setBounds( x, y, buttonWidth, h );
x += buttonWidth;
}
w -= buttonWidth;
backwardButtonVisible = true;