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, hidden, disable, disabled, inactive, model, TreeModel, DefaultTreeModel, TreeNode, TreePath, ImageObserver, event

The source code

/* (swing1.1)*/
package tame.examples;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
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.Box;
import javax.swing.BoxLayout;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.border.TitledBorder;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreePath;

import tame.tree.InvisibleNode;
import tame.tree.InvisibleTreeModel;

/**
@author Nobuo Tamemasa
@version 1.0 01/12/99
*/
public class InvisibleNodeTreeExample extends JFrame {
  public InvisibleNodeTreeExample() {
    super("InvisibleNode TreeExample");

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

    InvisibleNode[] nodes = new InvisibleNode[strs.length];
    for (int i=0;i<strs.length;i++) {
      nodes[i] = new InvisibleNode(strs[i]);
    }
    nodes[0].add(nodes[1]);
    nodes[1].add(nodes[2]);
    nodes[1].add(nodes[3]);
    nodes[0].add(nodes[4]);
    nodes[3].setVisible(false);
    InvisibleTreeModel ml = new InvisibleTreeModel( nodes[0] );
    ml.activateFilter(true);
    JTree tree = new JTree( ml );
    tree.setCellRenderer(new DefaultTreeCellRenderer() {
      public Component getTreeCellRendererComponent(JTree tree,
                   Object value, boolean sel, boolean expanded,
                   boolean leaf, int row, boolean hasFocus) {
        super.getTreeCellRendererComponent(tree, value,
                   sel, expanded, leaf, row, hasFocus);
        if (! ((InvisibleNode)value).isVisible()) {
          setForeground(Color.yellow);
        }
        return this;
      }
    });
    JScrollPane sp = new JScrollPane(tree);

    ModePanel   mp = new ModePanel(ml);
    ButtonPanel bp = new ButtonPanel(tree);
    Box box_right = new Box(BoxLayout.Y_AXIS);
    box_right.add(mp);
    box_right.add(bp);

    Box box = new Box(BoxLayout.X_AXIS);
    box.add(sp);
    box.add(Box.createVerticalGlue());
    box.add(box_right);
    getContentPane().add(box, BorderLayout.CENTER);
  }

  class ModePanel extends JPanel {
    ModePanel(final InvisibleTreeModel model) {
      setLayout(new GridLayout(2,1));
      setBorder(new TitledBorder("View Mode"));
      ButtonGroup group = new ButtonGroup();
      JRadioButton b_all  = new JRadioButton("all");
      JRadioButton b_hide = new JRadioButton("hide");
      add(b_all);
      add(b_hide);
      group.add(b_all);
      group.add(b_hide);
      b_all.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
          if (model.isActivatedFilter()) {
            model.activateFilter(false);
            model.reload();
          }
        }
      });
      b_hide.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
          if (! model.isActivatedFilter()) {
            model.activateFilter(true);
            model.reload();
          }
        }
      });
      b_hide.setSelected(true);
    }
  }

  class ButtonPanel extends JPanel {
    ButtonPanel(final JTree tree) {
      setLayout(new GridLayout(2,1));
      setBorder(new TitledBorder("Change Node"));
      JButton b_visible   = new JButton("Visible");
      JButton b_invisible = new JButton("Invisible");
      //b_invisible.setForeground(Color.yellow);
      add(b_visible);
      add(b_invisible);
      b_visible.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
          setNodeVisible(tree, true);
        }
      });
      b_invisible.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
          setNodeVisible(tree, false);
        }
      });
    }

    private void setNodeVisible(final JTree tree, boolean isVisible) {
      DefaultTreeModel model = (DefaultTreeModel)tree.getModel();
      TreePath[] path = tree.getSelectionPaths();
      InvisibleNode node = null;
      for (int i=0;i<path.length;i++) {
        node = (InvisibleNode)path[i].getLastPathComponent();
        if (!(node == model.getRoot())) {
          node.setVisible(isVisible);
        } else {
          System.out.println("refused: root node");
        }
      }
      if (path.length == 1) {
        model.nodeChanged(node);
      } else {
        model.reload();
      }
    }
  }

  public static void main(String args[]) {
    InvisibleNodeTreeExample frame = new InvisibleNodeTreeExample();
    frame.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {System.exit(0);}
    });
    frame.setSize(300, 180);
    frame.setVisible(true);
  }
}