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TabbedPaneUI: When the mouse wheel event is not in the viewport, propagate the event to the nearest parent #1030

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TabbedPaneUI: When the mouse wheel event is not in the viewport, propagate the event to the nearest parent #1030

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16 changes: 15 additions & 1 deletion flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTabbedPaneUI.java
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Original file line number Diff line number Diff line change
Expand Up @@ -2707,8 +2707,22 @@ public void mouseWheelMoved( MouseWheelEvent e ) {

// because this listener receives mouse events for the whole tabbed pane,
// we have to check whether the mouse is located over the viewport
if( !isInViewport( e.getX(), e.getY() ) )
if( !isInViewport( e.getX(), e.getY() ) ) {
// if it is not in the viewport, retarget the even to a parent container
// which might support scrolling (e.g. a surrounding ScrollPane)
Container parent = getParent();
while (parent != null) {
// informing the first parent with a mouse wheel listener should be sufficient.
if (parent.getMouseWheelListeners().length > 0) {
for (MouseWheelListener parentListener : parent.getMouseWheelListeners()) {
parentListener.mouseWheelMoved(e);
}
return;
}
parent = parent.getContainer();
}
return;
}

lastMouseX = e.getX();
lastMouseY = e.getY();
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