StateTree.java 文件源码

private void maybeShowPopup(MouseEvent evt) {
    if (evt.isPopupTrigger()) {
        TreePath selectedPath = getPathForLocation(evt.getX(), evt.getY());
        TreeNode selectedNode =
            selectedPath == null ? null : (TreeNode) selectedPath.getLastPathComponent();
        StateTree.this.requestFocus();
        createPopupMenu(selectedNode).show(evt.getComponent(), evt.getX(), evt.getY());
    }
}