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What this is

This file is part of the Tame Swing collection that we have compiled. All of the Java source code in these examples was created by Nobuo Tamemasa. As these examples have become hard to find on the internet, we have put them in one place here, supported by minimal advertising. In time we will include images of each running sample Java/Swing application.

The intent of having these files here is to help you learn Java and Swing by example, and Tame certainly created some terrific examples of the power of the Swing framework.

Other links

Keywords/tags

java, swing, JTree, tree, node, disable, disabled, ImageIcon, icon, image, animated, model, TreeModel, DefaultTreeModel, TreeNode, TreePath, ImageObserver, event

The source code

/* (swing1.1.1beta2) swing#1331 */
package tame.examples;

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.border.TitledBorder;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreePath;

import tame.tree.DisabledNode;
import tame.tree.DisabledRenderer;

/**
@author Nobuo Tamemasa
@version 1.0 04/30/99
*/
public class DisabledNodeTreeExample2 extends JFrame {
  public DisabledNodeTreeExample2() {
    super("DisabledNode TreeExample");

    String[] strs = {"swing",     // 0
		     "plaf",      // 1
		     "basic",     // 2
		     "metal",     // 3
		     "JTree",     // 4
		     "plaf",      // 5
		     "motif"};    // 6

    DisabledNode[] nodes = new DisabledNode[strs.length];
    for (int i=0;i<strs.length;i++) {
      nodes[i] = new DisabledNode(strs[i]);
    }
    nodes[0].add(nodes[1]);
    nodes[1].add(nodes[2]);
    nodes[1].add(nodes[3]);
    nodes[0].add(nodes[4]);
    nodes[0].add(nodes[5]);
    nodes[5].add(nodes[6]);
    nodes[3].setEnabled(false);
    nodes[5].setEnabled(false);

    final JTree tree = new JTree( nodes[0] ) {
      public boolean isPathEditable(TreePath path) {
        DisabledNode node = (DisabledNode)path.getLastPathComponent();
        if (node.isEnabled()) {
          return isEditable();
        } else {
          return false;
        }
      }
    };

    DisabledRenderer renderer = new DisabledRenderer();
    tree.setCellRenderer(renderer);
    tree.setEditable(true);

    JScrollPane sp = new JScrollPane(tree);
    ButtonPanel bp = new ButtonPanel(tree);
    getContentPane().add(sp, BorderLayout.CENTER);
    getContentPane().add(bp, BorderLayout.EAST);
  }

  class ButtonPanel extends JPanel {
    JTree tree;
    DefaultTreeModel model;

    ButtonPanel(JTree tree) {
      this.tree = tree;
      model = (DefaultTreeModel)tree.getModel();
      setLayout(new GridLayout(2,1));
      setBorder(new TitledBorder("Change Node"));
      JButton enabledButton  = new JButton("Enabled");
      JButton disabledButton = new JButton("Disabled");
      add(enabledButton);
      add(disabledButton);
      enabledButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
          setNodeEnabled( true  );
        }
      });
      disabledButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
          setNodeEnabled( false );
        }
      });
    }

    private void setNodeEnabled(boolean enabled) {
      TreePath[] path = tree.getSelectionPaths();
      if (path == null) return;
      DisabledNode node = null;
      for (int i=0;i<path.length;i++) {
        node = (DisabledNode)path[i].getLastPathComponent();
        //if (node.isRoot()) {
        //  System.out.println("refused: root node");
        //} else {
          int beforeChildCount = node.getChildCount();
          node.setEnabled(enabled);
          int afterChildCount  = node.getChildCount();
          if (beforeChildCount == afterChildCount) {
            model.nodeChanged(node);
          } else {
            model.reload();
          }
        //}
      }
    }
  }

  public static void main(String args[]) {
    /*
    try {
      UIManager.setLookAndFeel("com.sun.java.swing.plaf.motif.MotifLookAndFeel");
    } catch (Exception ex) {
    }
   */

    DisabledNodeTreeExample2 frame = new DisabledNodeTreeExample2();
    frame.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {System.exit(0);}
    });
    frame.setSize(300, 180);
    frame.setVisible(true);
  }
}

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