How to add a JLabel in any leaf of a JTree

[buntha Choudhary]

I want to add a JLabel in any Leaf of a JTree . I tried to use TreeCellRenderer but I don't know how to implement it properly.
Following is a sample code where I want to add a JLabel in the leaf of a JTree but I am not getting proper output.

import java.awt.Dimension;

import javax.swing.*;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;

public class JTreeExample {

	JTree tree;
	String subMenus[] = {"Menu1","Menu2"};
	public JTreeExample(){
		JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //f.getContentPane().add(new SplitNodeTest().getContent());
        f.setSize(360,300);
        f.setLocation(200,200);
        f.setVisible(true);
        
        JPanel panel = new JPanel();
        f.getContentPane().add(panel);
        
		tree = new JTree();
		Object obj = new String("MY COMPUTER");
		DefaultMutableTreeNode top = new DefaultMutableTreeNode(obj);		
		DefaultTreeModel tree_Model = new DefaultTreeModel(top);
		
		tree = new JTree(tree_Model);
		JScrollPane scrollPane = new JScrollPane(tree);
		scrollPane.getViewport().setPreferredSize(new Dimension(360,300));
		panel.add(scrollPane);
		
		/*This JLabel should come proper as Submenus*/
		JLabel label = new JLabel("SUBMENU");
		
		DefaultMutableTreeNode subTree;
		for(int i=0;i<subMenus.length;i++){
			subTree = new DefaultMutableTreeNode(subMenus[i]);
			top.add(subTree);
			subTree.add(new DefaultMutableTreeNode(label));
		}
	}
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
			new JTreeExample();
	}

}

[Paul Clapham]

Why a JLabel? Just use a String, it gets rendered as a JLabel by default anyway.

[buntha Choudhary]

JLabel because actually my application wants JTextPane , Combo Boxes and all . So atleast any of these implementation will show me the way to use other components.

So , please show the way to use it.

[Michael Dunn]

> So , please show the way to use it.

did you try the tutorial?

http://java.sun.com/docs/books/tutorial/uiswing/components/tree.html#display

[buntha Choudhary]

Yes I tried the url as well but an example for my code will show me a proper way to start.

[Darryl Burke]

buntha Choudhary wrote:Yes I tried the url as well but an example for my code will show me a proper way to start.

You mean you didn't scroll down the page enough to see that there are code samples in the tutorial? Really!

[buntha Choudhary]

I tried and I code as well . I just could not found some scenarios very clear like I added a JButton but how put action to that button. Similarly with JTextField and all other components.

If any link is there where sample codes are there , please provide me.

[Michael Dunn]

> If any link is there where sample codes are there , please provide me.

there's plenty in the link
there's plenty on this site
there's plenty at google

if you really can't get started, pay someone, or change careers

[buntha Choudhary]

I tried but I am not able to add the action event to the JButton in the JTree . According to the example given , Under ROOT , there are 4 Menus and under Menu3 , there is a submenu as JButton , but action events are not working.

import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.util.EventObject;
 
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeCellEditor;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.DefaultTreeModel;
 
 
 
public class TreePractise {
 
	String menus[] = {"MENU1","MENU2","MENU3","MENU4"};
	JTree tree ;
	JButton but = new JButton("CREATE");
	public TreePractise() {
		// TODO Auto-generated constructor stub
		
		JFrame frame = new JFrame("TREE PRACTISE");
		frame.setSize(400,500);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		JPanel panel = new JPanel();
		panel.setBackground(Color.WHITE);
		frame.getContentPane().add(panel);
		frame.setVisible(true);
		
		DefaultMutableTreeNode top = new DefaultMutableTreeNode("ROOT");		
		DefaultTreeModel tree_Model = new DefaultTreeModel(top);
		tree = new JTree(tree_Model);
		TreeRenderer tr = new TreeRenderer(but);
		TreeEditor te = new TreeEditor(tree,tr);
		//TreeCell tc = new TreeCell(tree,tr);
		tree.setEditable(true);
		tree.setCellRenderer(tr);
		tree.setCellEditor(te);
		JScrollPane scrollPane = new JScrollPane(tree);
		scrollPane.getViewport().setPreferredSize(new Dimension(400,500));
		panel.add(scrollPane);
		
		
		
		DefaultMutableTreeNode mtn;
		for(int i=0;i<menus.length;i++){
			mtn = new DefaultMutableTreeNode(menus[i]){
				public boolean isCellEditable(EventObject event) {
					// TODO Auto-generated method stub
					if(menus[2].equalsIgnoreCase("MENU3")){
						return true;
					}
					return false;
				}
			};
			top.add(mtn);
 
			if(mtn.toString().equals("MENU3")){
				
				PersonalInformationTree(mtn);
			}
		}
		
		but.addActionListener(new ActionListener(){
 
			@Override
			public void actionPerformed(ActionEvent arg0) {
				// TODO Auto-generated method stub
				System.out.println("PRESS ME");
			}
			
		});
		
	}
 
	private void PersonalInformationTree(DefaultMutableTreeNode mtn) {
		// TODO Auto-generated method stub
		but.setEnabled(true);
		DefaultMutableTreeNode dtn = new DefaultMutableTreeNode(but){
			public boolean isCellEditable(EventObject event) {
				
				return true;
			}
		
		public Object getCellEditorValue ()
		{
			
			return "Buntha";
		}
		
			public boolean isCellEnabled(EventObject event){
				return true;
			}
		
		};
		
		mtn.add(dtn);
	}
 
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
 
		new TreePractise();
	}
 
}
 
class TreeRenderer extends DefaultTreeCellRenderer{
	
	JButton button = new JButton();
	public TreeRenderer(JButton button){
		this.button = button;
		
		
		button.addActionListener(new ActionListener(){
 
			@Override
			public void actionPerformed(ActionEvent arg0) {
				// TODO Auto-generated method stub
				System.out.println("-------------");
			}
			
		});
	}
	
	public Component getTreeCellRendererComponent   
	   (JTree tree, Object value, boolean selected, boolean expanded,   
	   boolean leaf, int row, boolean hasFocus){   
		 
		Component c = super.getTreeCellRendererComponent(tree, value, selected,
				 expanded, leaf, row, hasFocus);
		 
		if(value.toString().contains("JButton")){
			return button;
		} 
		 
		return c;
	}
}
 
class TreeEditor extends DefaultTreeCellEditor implements ActionListener{
 
	JButton button;
	public TreeEditor(JTree tree, DefaultTreeCellRenderer rend) {
		super(tree, rend);
		System.out.println("TREE DITOR");
		// TODO Auto-generated constructor stub
	}
	
	public Component getTreeCellEditorComponent(JTree tree, Object value,
		      boolean isSelected, boolean expanded, boolean leaf, int row) {
		//System.out.println(value);
		button = new JButton("CREATE");
		button.addActionListener(new ActionListener(){
 
			@Override
			public void actionPerformed(ActionEvent arg0) {
				// TODO Auto-generated method stub
				System.out.println("+++++++++++++++++=");
			}
			
		});
		Component c = super.getTreeCellEditorComponent(tree, value, isSelected,
		        expanded, leaf, row);
		System.out.println(c);
		return c;
	}
	
	public void actionPerformed(ActionEvent e){
		System.out.println("ACTION PERFORMED");
	} 
	
	
}

[Michael Dunn]

luckily I saw your cross-post before I posted a solution

http://forums.sun.com/thread.jspa?threadID=5435113&tstart=0

bye.

[buntha Choudhary]

I posted in other forums as well because I am really not sure about the solution of my problem .
I did not know that these forums are related and my post will be considered as a cross post.

[Rob Spoor]

Be Forthright When Cross Posting To Other Sites.