sampletree.java

java中關於tree的寫法,不同于往常

/*
 * Copyright (c) 2003 Sun Microsystems, Inc. All  Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * -Redistributions of source code must retain the above copyright
 *  notice, this list of conditions and the following disclaimer.
 * 
 * -Redistribution in binary form must reproduct the above copyright
 *  notice, this list of conditions and the following disclaimer in
 *  the documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of Sun Microsystems, Inc. or the names of contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT
 * BE LIABLE FOR ANY DAMAGES OR LIABILITIES SUFFERED BY LICENSEE AS A RESULT
 * OF OR RELATING TO USE, MODIFICATION OR DISTRIBUTION OF THE SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
 * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
 * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
 * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE SOFTWARE, EVEN
 * IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 * 
 * You acknowledge that Software is not designed, licensed or intended for
 * use in the design, construction, operation or maintenance of any nuclear
 * facility.
 */

/*
 * @(#)SampleTree.java	1.22 03/01/23
 */

import javax.swing.*;
import javax.swing.event.*;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.*;
import javax.swing.tree.*;

/**
  * A demo for illustrating how to do different things with JTree.
  * The data that this displays is rather boring, that is each node will
  * have 7 children that have random names based on the fonts.  Each node
  * is then drawn with that font and in a different color.
  * While the data isn't interesting the example illustrates a number
  * of things:
  *
  * For an example of dynamicaly loading children refer to DynamicTreeNode.
  * For an example of adding/removing/inserting/reloading refer to the inner
  *     classes of this class, AddAction, RemovAction, InsertAction and
  *     ReloadAction.
  * For an example of creating your own cell renderer refer to
  *     SampleTreeCellRenderer.
  * For an example of subclassing JTreeModel for editing refer to
  *     SampleTreeModel.
  *
  * @version 1.22 01/23/03
  * @author Scott Violet
  */

public class SampleTree
{
    /** Window for showing Tree. */
    protected JFrame            frame;
    /** Tree used for the example. */
    protected JTree             tree;
    /** Tree model. */
    protected DefaultTreeModel        treeModel;

    /**
      * Constructs a new instance of SampleTree.
      */
    public SampleTree() {
	// Force SampleTree to come up in the Cross Platform L&F
	try {
	    UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
	    // If you want the System L&F instead, comment out the above line and
	    // uncomment the following:
	    // UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
	} catch (Exception exc) {
	    System.err.println("Error loading L&F: " + exc);
	}


	JMenuBar         menuBar = constructMenuBar();
	JPanel           panel = new JPanel(true);

	frame = new JFrame("SampleTree");
	frame.getContentPane().add("Center", panel);
	frame.setJMenuBar(menuBar);
	frame.setBackground(Color.lightGray);

	/* Create the JTreeModel. */
	DefaultMutableTreeNode root = createNewNode("Root");
	treeModel = new SampleTreeModel(root);

	/* Create the tree. */
	tree = new JTree(treeModel);

	/* Enable tool tips for the tree, without this tool tips will not
	   be picked up. */
	ToolTipManager.sharedInstance().registerComponent(tree);

	/* Make the tree use an instance of SampleTreeCellRenderer for
	   drawing. */
	tree.setCellRenderer(new SampleTreeCellRenderer());

	/* Make tree ask for the height of each row. */
	tree.setRowHeight(-1);

	/* Put the Tree in a scroller. */
	JScrollPane        sp = new JScrollPane();
	sp.setPreferredSize(new Dimension(300, 300));
	sp.getViewport().add(tree);

	/* And show it. */
	panel.setLayout(new BorderLayout());
	panel.add("Center", sp);
	panel.add("South", constructOptionsPanel());

	frame.addWindowListener( new WindowAdapter() {
	    public void windowClosing(WindowEvent e) {System.exit(0);}});

	frame.pack();
	frame.show();
    }

    /** Constructs a JPanel containing check boxes for the different
      * options that tree supports. */
    private JPanel constructOptionsPanel() {
	JCheckBox               aCheckbox;
	JPanel           retPanel = new JPanel(false);
	JPanel           borderPane = new JPanel(false);

	borderPane.setLayout(new BorderLayout());
	retPanel.setLayout(new FlowLayout());

	aCheckbox = new JCheckBox("show handles");
	aCheckbox.setSelected(tree.getShowsRootHandles());
	aCheckbox.addChangeListener(new ShowHandlesChangeListener());
	retPanel.add(aCheckbox);

	aCheckbox = new JCheckBox("show root");
	aCheckbox.setSelected(tree.isRootVisible());
	aCheckbox.addChangeListener(new ShowRootChangeListener());
	retPanel.add(aCheckbox);

	aCheckbox = new JCheckBox("editable");
	aCheckbox.setSelected(tree.isEditable());
	aCheckbox.addChangeListener(new TreeEditableChangeListener());
	aCheckbox.setToolTipText("Triple click to edit");
	retPanel.add(aCheckbox);

	borderPane.add(retPanel, BorderLayout.CENTER);

	/* Create a set of radio buttons that dictate what selection should
	   be allowed in the tree. */
	ButtonGroup           group = new ButtonGroup();
	JPanel         buttonPane = new JPanel(false);
	JRadioButton          button;

	buttonPane.setLayout(new FlowLayout());
	button = new JRadioButton("Single");
	button.addActionListener(new AbstractAction() {
	    public boolean isEnabled() { return true; }
	    public void actionPerformed(ActionEvent e) {
		tree.getSelectionModel().setSelectionMode
		    (TreeSelectionModel.SINGLE_TREE_SELECTION);
	    }
	});
	group.add(button);
	buttonPane.add(button);
	button = new JRadioButton("Contiguous");
	button.addActionListener(new AbstractAction() {
	    public boolean isEnabled() { return true; }
	    public void actionPerformed(ActionEvent e) {
		tree.getSelectionModel().setSelectionMode
		    (TreeSelectionModel.CONTIGUOUS_TREE_SELECTION);
	    }
	});
	group.add(button);
	buttonPane.add(button);
	button = new JRadioButton("Discontiguous");
	button.addActionListener(new AbstractAction() {
	    public boolean isEnabled() { return true; }
	    public void actionPerformed(ActionEvent e) {
		tree.getSelectionModel().setSelectionMode
		    (TreeSelectionModel.DISCONTIGUOUS_TREE_SELECTION);
	    }
	});
	button.setSelected(true);
	group.add(button);
	buttonPane.add(button);

	borderPane.add(buttonPane, BorderLayout.SOUTH);

	// NOTE: This will be enabled in a future release.
	// Create a label and combobox to determine how many clicks are
	// needed to expand.
/*
	JPanel               clickPanel = new JPanel();
	Object[]             values = { "Never", new Integer(1),
					new Integer(2), new Integer(3) };
	final JComboBox      clickCBox = new JComboBox(values);

	clickPanel.setLayout(new FlowLayout());
	clickPanel.add(new JLabel("Click count to expand:"));
	clickCBox.setSelectedIndex(2);
	clickCBox.addActionListener(new ActionListener() {
	    public void actionPerformed(ActionEvent ae) {
		Object       selItem = clickCBox.getSelectedItem();

		if(selItem instanceof Integer)
		    tree.setToggleClickCount(((Integer)selItem).intValue());
		else // Don't toggle
		    tree.setToggleClickCount(0);
	    }
	});
	clickPanel.add(clickCBox);
	borderPane.add(clickPanel, BorderLayout.NORTH);
*/
	return borderPane;
    }

    /** Construct a menu. */
    private JMenuBar constructMenuBar() {
	JMenu            menu;
	JMenuBar         menuBar = new JMenuBar();
	JMenuItem        menuItem;

	/* Good ol exit. */
	menu = new JMenu("File");
	menuBar.add(menu);

	menuItem = menu.add(new JMenuItem("Exit"));
	menuItem.addActionListener(new ActionListener() {
	    public void actionPerformed(ActionEvent e) {
		System.exit(0);
	    }});

	/* Tree related stuff. */
	menu = new JMenu("Tree");
	menuBar.add(menu);

	menuItem = menu.add(new JMenuItem("Add"));
	menuItem.addActionListener(new AddAction());

	menuItem = menu.add(new JMenuItem("Insert"));
	menuItem.addActionListener(new InsertAction());

	menuItem = menu.add(new JMenuItem("Reload"));
	menuItem.addActionListener(new ReloadAction());

	menuItem = menu.add(new JMenuItem("Remove"));
	menuItem.addActionListener(new RemoveAction());

	return menuBar;
    }

    /**
      * Returns the TreeNode instance that is selected in the tree.
      * If nothing is selected, null is returned.
      */
    protected DefaultMutableTreeNode getSelectedNode() {
	TreePath   selPath = tree.getSelectionPath();

	if(selPath != null)
	    return (DefaultMutableTreeNode)selPath.getLastPathComponent();
	return null;
    }

    /**
     * Returns the selected TreePaths in the tree, may return null if
     * nothing is selected.
     */
    protected TreePath[] getSelectedPaths() {
        return tree.getSelectionPaths();
    }

    protected DefaultMutableTreeNode createNewNode(String name) {
	return new DynamicTreeNode(new SampleData(null, Color.black, name));
    }

    /**
      * AddAction is used to add a new item after the selected item.
      */
    class AddAction extends Object implements ActionListener
    {
	/** Number of nodes that have been added. */
	public int               addCount;

	/**
	  * Messaged when the user clicks on the Add menu item.