从CellEditorListener获取编辑的TreeNode

从CellEditorListener获取编辑的TreeNode

看来，要编辑的名字

Resource

在

DefaultMutableTreeNode

。正如您看到的，的源

ChangeEvent

发送到

editingStopped()

在没有一个

DefaultTreeCellEditor

; 它是编辑器的（匿名）UI委托。

而是getCellEditorValue()在您的中进行覆盖DefaultTreeCellEditor，如下所示。在DefaultTreeCellRenderer简单地调用toString()，通过convertValueToText()，它访问的用户对象DefaultMutableTreeNode。

附录：请注意，isCellEditable()确保只能编辑叶节点。

正如@kleopatra在注释中指出的那样，先前的TreeCellEditor实现无效，因为它修改了正在编辑的节点。下面的修订版本创建了一个具有更新名称的新节点；一个拷贝构造函数是在这方面非常有用。好处是userObject遗迹仍然是Resource。另请参见此替代方法。

public class TreeEditDemo extends JPanel {    private JTree tree;    private DefaultMutableTreeNode root;    private DefaultTreeCellEditor editor;    private JLabel label = new JLabel(" ", JLabel.CENTER);    public TreeEditDemo() {        super(new BorderLayout());        root = new DefaultMutableTreeNode("Nodes");        root.add(new DefaultMutableTreeNode(new Resource("one")));        root.add(new DefaultMutableTreeNode(new Resource("two")));        root.add(new DefaultMutableTreeNode(new Resource("three")));        final DefaultTreeModel treeModel = new DefaultTreeModel(root);        tree = new JTree(treeModel);        tree.setEditable(true);        editor = new MyTreeCellEditor(tree, (DefaultTreeCellRenderer) tree.getCellRenderer());        tree.setCellEditor(editor);        tree.getInputMap().put( KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0), "startEditing");        this.add(new JScrollPane(tree));        this.add(label, BorderLayout.SOUTH);        tree.addTreeSelectionListener(new TreeSelectionListener() { @Override public void valueChanged(TreeSelectionEvent e) {     TreePath path = e.getNewLeadSelectionPath();     if (path != null) {         DefaultMutableTreeNode node =  (DefaultMutableTreeNode) path.getLastPathComponent();         if (node.isLeaf()) {  Resource user = (Resource) node.getUserObject();  label.setText(user.toString());         } else {  label.setText(" ");         }     } }        });        editor.addCellEditorListener(new CellEditorListener() { @Override public void editingStopped(ChangeEvent e) {     label.setText(editor.getCellEditorValue().toString()); } @Override public void editingCanceled(ChangeEvent e) { }        });    }    private static class MyTreeCellEditor extends DefaultTreeCellEditor {        public MyTreeCellEditor(JTree tree, DefaultTreeCellRenderer renderer) { super(tree, renderer);        }        @Override        public Object getCellEditorValue() { String value = (String) super.getCellEditorValue(); return new Resource(value);        }        @Override        public boolean isCellEditable(EventObject e) { return super.isCellEditable(e)     && ((TreeNode) lastPath.getLastPathComponent()).isLeaf();        }    }    private static class Resource {        String name;        public Resource(String name) { this.name = name;        }        public String getName() { return name;        }        public void setName(String name) { this.name = name;        }        @Override        public String toString() { return getName();        }    }    private void display() {        Jframe f = new Jframe("TreeEditorDemo");        f.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE);        f.add(this);        f.pack();        f.setLocationRelativeTo(null);        f.setVisible(true);    }    public static void main(String[] args) {        EventQueue.invokeLater(new Runnable() { @Override public void run() {     new TreeEditDemo().display(); }        });    }}