Mega Code Archive
Tree with custom icon
<![CDATA[
/*
* Copyright (c) 1995 - 2008 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.
*
* - Redistributions in binary form must reproduce 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 nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* A 1.4 application that requires the following additional files:
* TreeDemoHelp.html
* arnold.html
* bloch.html
* chan.html
* jls.html
* swingtutorial.html
* tutorial.html
* tutorialcont.html
* vm.html
*/
import java.awt.Component;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.io.IOException;
import java.net.URL;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.JTree;
import javax.swing.ToolTipManager;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.TreeSelectionModel;
public class TreeIconDemo2 extends JPanel implements TreeSelectionListener {
private JEditorPane htmlPane;
private JTree tree;
private URL helpURL;
private static boolean DEBUG = false;
public TreeIconDemo2() {
super(new GridLayout(1, 0));
// Create the nodes.
DefaultMutableTreeNode top = new DefaultMutableTreeNode("The Java Series");
createNodes(top);
// Create a tree that allows one selection at a time.
tree = new JTree(top);
tree.getSelectionModel().setSelectionMode(
TreeSelectionModel.SINGLE_TREE_SELECTION);
// Enable tool tips.
ToolTipManager.sharedInstance().registerComponent(tree);
// Set the icon for leaf nodes.
ImageIcon tutorialIcon = createImageIcon("images/middle.gif");
if (tutorialIcon != null) {
tree.setCellRenderer(new MyRenderer(tutorialIcon));
} else {
System.err.println("Tutorial icon missing; using default.");
}
// Listen for when the selection changes.
tree.addTreeSelectionListener(this);
// Create the scroll pane and add the tree to it.
JScrollPane treeView = new JScrollPane(tree);
// Create the HTML viewing pane.
htmlPane = new JEditorPane();
htmlPane.setEditable(false);
initHelp();
JScrollPane htmlView = new JScrollPane(htmlPane);
// Add the scroll panes to a split pane.
JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT);
splitPane.setTopComponent(treeView);
splitPane.setBottomComponent(htmlView);
Dimension minimumSize = new Dimension(100, 50);
htmlView.setMinimumSize(minimumSize);
treeView.setMinimumSize(minimumSize);
splitPane.setDividerLocation(100); // XXX: ignored in some releases
// of Swing. bug 4101306
// workaround for bug 4101306:
// treeView.setPreferredSize(new Dimension(100, 100));
splitPane.setPreferredSize(new Dimension(500, 300));
// Add the split pane to this panel.
add(splitPane);
}
/** Required by TreeSelectionListener interface. */
public void valueChanged(TreeSelectionEvent e) {
DefaultMutableTreeNode node = (DefaultMutableTreeNode) tree
.getLastSelectedPathComponent();
if (node == null)
return;
Object nodeInfo = node.getUserObject();
if (node.isLeaf()) {
BookInfo book = (BookInfo) nodeInfo;
displayURL(book.bookURL);
if (DEBUG) {
System.out.print(book.bookURL + ": \n ");
}
} else {
displayURL(helpURL);
}
if (DEBUG) {
System.out.println(nodeInfo.toString());
}
}
private class BookInfo {
public String bookName;
public URL bookURL;
public BookInfo(String book, String filename) {
bookName = book;
bookURL = TreeIconDemo2.class.getResource(filename);
if (bookURL == null) {
System.err.println("Couldn't find file: " + filename);
}
}
public String toString() {
return bookName;
}
}
private void initHelp() {
String s = "TreeDemoHelp.html";
helpURL = TreeIconDemo2.class.getResource(s);
if (helpURL == null) {
System.err.println("Couldn't open help file: " + s);
} else if (DEBUG) {
System.out.println("Help URL is " + helpURL);
}
displayURL(helpURL);
}
private void displayURL(URL url) {
try {
if (url != null) {
htmlPane.setPage(url);
} else { // null url
htmlPane.setText("File Not Found");
if (DEBUG) {
System.out.println("Attempted to display a null URL.");
}
}
} catch (IOException e) {
System.err.println("Attempted to read a bad URL: " + url);
}
}
private void createNodes(DefaultMutableTreeNode top) {
DefaultMutableTreeNode category = null;
DefaultMutableTreeNode book = null;
category = new DefaultMutableTreeNode("Books for Java Programmers");
top.add(category);
// original Tutorial
book = new DefaultMutableTreeNode(new BookInfo(
"The Java Tutorial: A Short Course on the Basics", "tutorial.html"));
category.add(book);
// Tutorial Continued
book = new DefaultMutableTreeNode(
new BookInfo("The Java Tutorial Continued: The Rest of the JDK",
"tutorialcont.html"));
category.add(book);
// JFC Swing Tutorial
book = new DefaultMutableTreeNode(new BookInfo(
"The JFC Swing Tutorial: A Guide to Constructing GUIs",
"swingtutorial.html"));
category.add(book);
// Bloch
book = new DefaultMutableTreeNode(new BookInfo(
"Effective Java Programming Language Guide", "bloch.html"));
category.add(book);
// Arnold/Gosling
book = new DefaultMutableTreeNode(new BookInfo(
"The Java Programming Language", "arnold.html"));
category.add(book);
// Chan
book = new DefaultMutableTreeNode(new BookInfo(
"The Java Developers Almanac", "chan.html"));
category.add(book);
category = new DefaultMutableTreeNode("Books for Java Implementers");
top.add(category);
// VM
book = new DefaultMutableTreeNode(new BookInfo(
"The Java Virtual Machine Specification", "vm.html"));
category.add(book);
// Language Spec
book = new DefaultMutableTreeNode(new BookInfo(
"The Java Language Specification", "jls.html"));
category.add(book);
}
/** Returns an ImageIcon, or null if the path was invalid. */
protected static ImageIcon createImageIcon(String path) {
java.net.URL imgURL = TreeIconDemo2.class.getResource(path);
if (imgURL != null) {
return new ImageIcon(imgURL);
} else {
System.err.println("Couldn't find file: " + path);
return null;
}
}
/**
* Create the GUI and show it. For thread safety, this method should be
* invoked from the event-dispatching thread.
*/
private static void createAndShowGUI() {
// Create and set up the window.
JFrame frame = new JFrame("TreeIconDemo2");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Create and set up the content pane.
TreeIconDemo2 newContentPane = new TreeIconDemo2();
newContentPane.setOpaque(true); // content panes must be opaque
frame.setContentPane(newContentPane);
// Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
// Schedule a job for the event-dispatching thread:
// creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
private class MyRenderer extends DefaultTreeCellRenderer {
Icon tutorialIcon;
public MyRenderer(Icon icon) {
tutorialIcon = icon;
}
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 (leaf && isTutorialBook(value)) {
setIcon(tutorialIcon);
setToolTipText("This book is in the Tutorial series.");
} else {
setToolTipText(null); // no tool tip
}
return this;
}
protected boolean isTutorialBook(Object value) {
DefaultMutableTreeNode node = (DefaultMutableTreeNode) value;
BookInfo nodeInfo = (BookInfo) (node.getUserObject());
String title = nodeInfo.bookName;
if (title.indexOf("Tutorial") >= 0) {
return true;
}
return false;
}
}
}
]]>