Author: Nobuo Tamemasa

Mark nodes in a JTree as invisible and handle them appropriately when displaying the tree.

Sample usage:

/* (swing1.1) */
//package jp.gr.java_conf.tame.swing.examples;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.border.*;

import jp.gr.java_conf.tame.swing.tree.*;

/**
 * @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);
  }
}

Download Source Files

Posted On: 17-Jan-1999

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