feat(JTreeComboBox): 优化下拉框显示内容及选中项处理

- 设置整个 JComboBox 的 renderer，自定义列表单元格渲染器
- 优化选中项处理逻辑，支持非 DefaultMutableTreeNode 类型的选中项
- 添加调试日志，便于跟踪组件状态变化

src/cn/net/connor/createTempDrawings/utils/JTreeComboBox.java

@@ -41,6 +41,7 @@ public class JTreeComboBox extends JComboBox<Object> {
             @Override
             public void valueChanged(TreeSelectionEvent e) {
                 if (!suppressEvents) {
+                    System.out.println("更新选中项！");
                     DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();
                     if (selectedNode != null) {
                         setSelectedItem(selectedNode);
@@ -90,23 +91,41 @@ public class JTreeComboBox extends JComboBox<Object> {
             }
         });
         
+        // 设置整个 JComboBox 的 renderer
+        this.setRenderer(new DefaultListCellRenderer() {
+            @Override
+            public Component getListCellRendererComponent(JList<?> list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
+                if (value instanceof DefaultMutableTreeNode) {
+                    DefaultMutableTreeNode node = (DefaultMutableTreeNode) value;
+                    value = node.getUserObject(); // 使用节点的用户对象作为显示内容
+                }
+                return super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
+            }
+        });
+        
         // 初始选择根节点
         setSelectedItem(root);
         
         System.out.println("JTreeComboBox初始化完成");
+
+        
     }
     
     @Override
     public void setSelectedItem(Object anObject) {
+        System.out.println("设置选中项: " + anObject);
         suppressEvents = true;
         super.setSelectedItem(anObject);
         suppressEvents = false;
         
         // 更新树的选择状态
+        System.out.println("选中项类型 = "+anObject.getClass().getTypeName());
         if (anObject instanceof DefaultMutableTreeNode) {
             DefaultMutableTreeNode node = (DefaultMutableTreeNode) anObject;
             TreePath path = new TreePath(node.getPath());
             tree.setSelectionPath(path);
+        }else {
+            System.out.println("选中项:"+anObject+"不是DefaultMutableTreeNode类型，设置选中项失败！");
         }
         revalidate(); // 触发布局更新
         repaint();    // 触发重绘