Examples with ScrollPaneUI javax.swing.plaf.ScrollPaneUI used on opensource projects

Example 1 with ScrollPaneUI

use of javax.swing.plaf.ScrollPaneUI in project intellij-community by JetBrains.

the class JBScrollPane method setUI.

@Override
public void setUI(ScrollPaneUI ui) {
    super.setUI(ui);
    updateViewportBorder();
    if (ui instanceof BasicScrollPaneUI) {
        try {
            Field field = BasicScrollPaneUI.class.getDeclaredField("mouseScrollListener");
            field.setAccessible(true);
            Object value = field.get(ui);
            if (value instanceof MouseWheelListener) {
                MouseWheelListener oldListener = (MouseWheelListener) value;
                MouseWheelListener newListener = event -> {
                    if (isScrollEvent(event)) {
                        Object source = event.getSource();
                        if (source instanceof JScrollPane) {
                            JScrollPane pane = (JScrollPane) source;
                            if (pane.isWheelScrollingEnabled()) {
                                JScrollBar bar = event.isShiftDown() ? pane.getHorizontalScrollBar() : pane.getVerticalScrollBar();
                                if (bar != null && bar.isVisible()) {
                                    if (!(bar instanceof JBScrollBar && ((JBScrollBar) bar).handleMouseWheelEvent(event))) {
                                        oldListener.mouseWheelMoved(event);
                                    }
                                }
                            }
                        }
                    }
                };
                field.set(ui, newListener);
                // replace listener if field updated successfully
                removeMouseWheelListener(oldListener);
                addMouseWheelListener(newListener);
            }
        } catch (Exception exception) {
            LOG.warn(exception);
        }
    }
}