Source Code : This program demonstrates tree editing.

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This program demonstrates tree editing.

 

/*
   This program is a part of the companion code for Core Java 8th ed.
   (http://horstmann.com/corejava)

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

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.DefaultTreeModel;
import javax.swing.tree.TreeNode;
import javax.swing.tree.TreePath;

/**
 * This program demonstrates tree editing.
 * @version 1.03 2007-08-01
 * @author Cay Horstmann
 */
public class TreeEditTest
{
   public static void main(String[] args)
   {
      EventQueue.invokeLater(new Runnable()
         {
            public void run()
            {
               JFrame frame = new TreeEditFrame();
               frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
               frame.setVisible(true);
            }
         });
   }
}

/**
 * A frame with a tree and buttons to edit the tree.
 */
class TreeEditFrame extends JFrame
{
   public TreeEditFrame()
   {
      setTitle("TreeEditTest");
      setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

      // construct tree

      TreeNode root = makeSampleTree();
      model = new DefaultTreeModel(root);
      tree = new JTree(model);
      tree.setEditable(true);

      // add scroll pane with tree

      JScrollPane scrollPane = new JScrollPane(tree);
      add(scrollPane, BorderLayout.CENTER);

      makeButtons();
   }

   public TreeNode makeSampleTree()
   {
      DefaultMutableTreeNode root = new DefaultMutableTreeNode("World");
      DefaultMutableTreeNode country = new DefaultMutableTreeNode("USA");
      root.add(country);
      DefaultMutableTreeNode state = new DefaultMutableTreeNode("California");
      country.add(state);
      DefaultMutableTreeNode city = new DefaultMutableTreeNode("San Jose");
      state.add(city);
      city = new DefaultMutableTreeNode("San Diego");
      state.add(city);
      state = new DefaultMutableTreeNode("Michigan");
      country.add(state);
      city = new DefaultMutableTreeNode("Ann Arbor");
      state.add(city);
      country = new DefaultMutableTreeNode("Germany");
      root.add(country);
      state = new DefaultMutableTreeNode("Schleswig-Holstein");
      country.add(state);
      city = new DefaultMutableTreeNode("Kiel");
      state.add(city);
      return root;
   }

   /**
    * Makes the buttons to add a sibling, add a child, and delete a node.
    */
   public void makeButtons()
   {
      JPanel panel = new JPanel();
      JButton addSiblingButton = new JButton("Add Sibling");
      addSiblingButton.addActionListener(new ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {
               DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode) tree
                     .getLastSelectedPathComponent();

               if (selectedNode == null) return;

               DefaultMutableTreeNode parent = (DefaultMutableTreeNode) selectedNode.getParent();

               if (parent == null) return;

               DefaultMutableTreeNode newNode = new DefaultMutableTreeNode("New");

               int selectedIndex = parent.getIndex(selectedNode);
               model.insertNodeInto(newNode, parent, selectedIndex + 1);

               // now display new node

               TreeNode[] nodes = model.getPathToRoot(newNode);
               TreePath path = new TreePath(nodes);
               tree.scrollPathToVisible(path);
            }
         });
      panel.add(addSiblingButton);

      JButton addChildButton = new JButton("Add Child");
      addChildButton.addActionListener(new ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {
               DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode) tree
                     .getLastSelectedPathComponent();

               if (selectedNode == null) return;

               DefaultMutableTreeNode newNode = new DefaultMutableTreeNode("New");
               model.insertNodeInto(newNode, selectedNode, selectedNode.getChildCount());

               // now display new node

               TreeNode[] nodes = model.getPathToRoot(newNode);
               TreePath path = new TreePath(nodes);
               tree.scrollPathToVisible(path);
            }
         });
      panel.add(addChildButton);

      JButton deleteButton = new JButton("Delete");
      deleteButton.addActionListener(new ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {
               DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode) tree
                     .getLastSelectedPathComponent();

               if (selectedNode != null && selectedNode.getParent() != null) model
                     .removeNodeFromParent(selectedNode);
            }
         });
      panel.add(deleteButton);
      add(panel, BorderLayout.SOUTH);
   }

   private DefaultTreeModel model;
   private JTree tree;
   private static final int DEFAULT_WIDTH = 400;
   private static final int DEFAULT_HEIGHT = 200;
}

   
  

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