java - 如何捕获JTree节点扩展事件

我在SWING JTree中寻找一种与SWT类似的方法
TreeNode.addListener（SWT.Expand，新的Listener（）...
我设法检查了最后一个选定的节点以找到选定的那个节点，但是如何找到扩展了哪个节点并以正确的方式处理呢？

最佳答案

使用（有趣的名称）TreeWillExpandListener。

TreeWillExpandListener treeWillExpandListener = new TreeWillExpandListener() {
      public void treeWillCollapse(TreeExpansionEvent treeExpansionEvent)
          throws ExpandVetoException {

        TreePath path = treeExpansionEvent.getPath();
        DefaultMutableTreeNode node = (DefaultMutableTreeNode) path.getLastPathComponent();

        //Print the name of the node if toString() was implemented
        String data = node.getUserObject().toString();
        System.out.println("WillCollapse: " + data);

      }

      public void treeWillExpand(TreeExpansionEvent treeExpansionEvent) throws ExpandVetoException {

        TreePath path = treeExpansionEvent.getPath();
        DefaultMutableTreeNode node = (DefaultMutableTreeNode) path.getLastPathComponent();

        //print the name of the node if toString was implemented
        String data = node.getUserObject().toString();
        System.out.println("WillExpand: " + data);

      }
    };

tree.addTreeWillExpandListener(treeWillExpandListener);