Determing which component from a custom TreeCellRenderer was clicked on

Question

hi,
i've been experimenting with finding which component has been clicked on in a JTree which has a custom tree cell renderer. I've got a piece of code that appears to work, but am unsure if this is the proper way to go about doing this, and whether it might fail under some circumstances.
any help appreciated,
asjf
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
public class JTreeTest1 {
   public static void main(String[] arg) throws Exception {
      final JTree tree = new JTree();
      final TreeCellRenderer renderer = new MyRenderer();
      tree.setCellRenderer(renderer);
      tree.addMouseListener(new MouseAdapter() {
         public void mouseClicked(MouseEvent e) {
            int x = e.getX(), y = e.getY();
            int row = tree.getRowForLocation(x,y);
            TreePath path = tree.getPathForLocation(x,y);
            if(path!=null) {
               Object o = path.getLastPathComponent();
               Rectangle r = tree.getPathBounds(path);
               // how to detect what component has been clicked on?
               // simplification: pretend all boolean state has no effect on renderer (which is true for the renderer below)
               Component renderedComponent = renderer.getTreeCellRendererComponent(tree, o, false, false, false, row, false);
               renderedComponent.setBounds(r);
               int _x = (int) ((double)e.getX() - r.getX());
               int _y = (int) ((double)e.getY() - r.getY());
               Component clickedUpon = SwingUtilities.getDeepestComponentAt(renderedComponent, _x, _y);
               if(clickedUpon instanceof JLabel) {
                  JLabel jl = (JLabel) clickedUpon;
                  System.out.println(jl.getText());
      JFrame frame = new JFrame("JTreeTest1");
      frame.getContentPane().add(tree);
      frame.pack();
      frame.setVisible(true);
class MyRenderer extends JPanel implements TreeCellRenderer {
   JLabel custom;
   public MyRenderer() {
      super(); // flow layout
      add(new JLabel("Hello"));
      add(custom = new JLabel());
      custom.setOpaque(true);
      custom.setBackground(UIManager.getColor("Tree.background"));
      custom.setForeground(UIManager.getColor("Tree.foreground"));
      add(new JLabel("World"));
   public Component getTreeCellRendererComponent(JTree tree, Object value, boolean isSelected, boolean expanded,
                                                 boolean leaf, int row, boolean hasFocus)
      custom.setText("("+value.toString()+")");
      return this;
}

Answer 1

My only advice would be to remember that rendered components are not actually added to the tree, so they are not a child of the tree... they actually cannot be clicked on. The rendered components are quickly used just to paint and specific image and then discarded (which is why you don't typically want to create new ones each time). When you click on the tree, there is no "rendered component" there, just an image that was painted.
Hope this helps
Josh Castagno
http://www.jdc-software.com