JTreeComboBox.java 文件源码

public CustomTreeRenderer() {
    setOpaque(true);
    //setBackgroundNonSelectionColor(tree.getBackground());
    tree.addMouseMotionListener(new MouseMotionAdapter() {

        @Override
        public void mouseMoved(MouseEvent me) {
            TreePath treePath = tree.getPathForLocation(me.getX(), me.getY());
            Object obj;
            if (treePath != null) {
                obj = treePath.getLastPathComponent();
            } else {
                obj = null;
            }
            if (obj != lastNode) {
                lastNode = obj;
                tree.repaint();
            }
        }
    });
}