Question

在GUI中，我在JTree的左侧显示一个JPanel。现在每个Node(leaf)，鼠标右键单击我想显示JPopup菜单，要求在右Node中显示JPanel的统计信息。

由于我是新手，我可以帮助代码。在此先感谢。

此致 Tushar Dodia。

Answer 1

使用JTree的方法

public TreePath getPathForLocation(int x, int y)

然后是TreePath

public Object getLastPathComponent()

从用户右键单击的点返回所需节点。

Answer 2

似乎引起了一些混乱（混淆了我自己;-) - 所以这里是一个代码片段，用于执行componentPopup的目标位置相关配置

    JPopupMenu popup = new JPopupMenu();
    final Action action = new AbstractAction("empty") {

        @Override
        public void actionPerformed(ActionEvent e) {
            // TODO Auto-generated method stub
        }
    };
    popup.add(action); 
    JTree tree = new JTree() {

        /** 
         * @inherited <p>
         */
        @Override
        public Point getPopupLocation(MouseEvent e) {
            if (e != null) {
               TreePath path = getClosestPathForLocation(e.getX(), e.getY());
               action.putValue(Action.NAME, String.valueOf(path.getLastPathComponent()));
               return e.getPoint();
            }
            action.putValue(Action.NAME, "no mouse"); 
            return null;
        }

    };
    tree.setComponentPopupMenu(popup);

Answer 3

我拿了@kleopatra解决方案并稍微改了一下。也许这不是最好的方式，但对我有用。

JTree tree = new JTree() {
    private static final long serialVersionUID = 1L;
    @Override public Point getPopupLocation(MouseEvent e) {
        if (e == null) return new Point(0,0);
        TreePath path = getClosestPathForLocation(e.getX(), e.getY());
        Object selected = path != null ? path.getLastPathComponent() : null;
        setComponentPopupMenu(getMenuForTreeNode(getComponentPopupMenu(), selected));
        setSelectionPath(path);
        return e.getPoint();
    }
};



public JPopupMenu getMenuForTreeNode(JPopupMenu menu, Object treeNode) {
    if (menu == null) menu = new JPopupMenu("Menu:");
    menu.removeAll();
    if (treeNode instanceof MyTreeItem) {
        menu.add(new JMenuItem("This is my tree item: " + treeNode.toString()));
    }
    return menu;
}

通过右键单击Swing in Java中的节点添加弹出菜单

3 个答案: