JTree Color

Question

Hi, I'm new to JTree. I've a problem with JTree setBackground. It seems to changed the background color without changing the node's label's background color and I've used setForeground but it seems like no effect. Can anyone help? Thanks

Answer 1

Hi, I'm new to JTree. I've a problem with JTree
setBackground. It seems to changed the background
color without changing the node's label's background
color and I've used setForeground but it seems like no
effect. Can anyone help? ThanksThe problem you're seeing is because each node is rendered with a component different from the JTree background as a whole. you need to set the background for the rendering component as well as the background.
The easiest way to do this is to use the DefaultTreeCellRenderer in the javax.swing.tree package.
http://java.sun.com/j2se/1.3/docs/api/javax/swing/tree/DefaultTreeCellRenderer.html
sample code follows.
import java.awt.Color;
import java.awt.Container;
import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.tree.DefaultTreeCellRenderer;
public class TestTree extends JFrame{
   public TestTree(){
      Container cp = getContentPane();
      JTree tree =  new JTree();
      DefaultTreeCellRenderer renderer = new DefaultTreeCellRenderer();
      renderer.setBackgroundNonSelectionColor(Color.blue);
      renderer.setBackgroundSelectionColor(Color.yellow);
      tree.setCellRenderer(renderer);
      tree.setBackground(Color.blue);
      cp.add(tree);
   public static void main(String args[]){
      TestTree tt = new TestTree();
      tt.pack();
      tt.show();
      tt.setDefaultCloseOperation(EXIT_ON_CLOSE);
}