Java tutorial
/* * Copyright (c) 1995, 2008, Oracle and/or its affiliates. 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 Oracle or 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. */ package misc; /* * TrackFocusDemo.java requires the following files: * Picture.java * images/Maya.jpg * images/Anya.jpg * images/Laine.jpg * images/Cosmo.jpg * images/Adele.jpg * images/Alexi.jpg */ import javax.swing.*; import java.beans.*; //Property change stuff import java.awt.*; import java.awt.event.*; public class TrackFocusDemo extends JPanel { Picture pic1, pic2, pic3, pic4, pic5, pic6; JLabel info; static String mayaString = "Maya"; static String anyaString = "Anya"; static String laineString = "Laine"; static String cosmoString = "Cosmo"; static String adeleString = "Adele"; static String alexiString = "Alexi"; String[] comments = { "Oops. What is this?", "This is Maya", "This is Anya", "This is Laine", "This is Cosmo", "This is Adele", "This is Alexi" }; public TrackFocusDemo() { super(new BorderLayout()); JPanel mugshots = new JPanel(new GridLayout(2, 3)); pic1 = new Picture(createImageIcon("images/" + mayaString + ".jpg", mayaString).getImage()); pic1.setName("1"); mugshots.add(pic1); pic2 = new Picture(createImageIcon("images/" + anyaString + ".jpg", anyaString).getImage()); pic2.setName("2"); mugshots.add(pic2); pic3 = new Picture(createImageIcon("images/" + laineString + ".jpg", laineString).getImage()); pic3.setName("3"); mugshots.add(pic3); pic4 = new Picture(createImageIcon("images/" + cosmoString + ".jpg", cosmoString).getImage()); pic4.setName("4"); mugshots.add(pic4); pic5 = new Picture(createImageIcon("images/" + adeleString + ".jpg", adeleString).getImage()); pic5.setName("5"); mugshots.add(pic5); pic6 = new Picture(createImageIcon("images/" + alexiString + ".jpg", alexiString).getImage()); pic6.setName("6"); mugshots.add(pic6); info = new JLabel("Nothing selected"); setPreferredSize(new Dimension(450, 350)); add(mugshots, BorderLayout.CENTER); add(info, BorderLayout.PAGE_END); setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20)); KeyboardFocusManager focusManager = KeyboardFocusManager.getCurrentKeyboardFocusManager(); focusManager.addPropertyChangeListener(new PropertyChangeListener() { public void propertyChange(PropertyChangeEvent e) { String prop = e.getPropertyName(); if (("focusOwner".equals(prop)) && ((e.getNewValue()) instanceof Picture)) { Component comp = (Component) e.getNewValue(); String name = comp.getName(); Integer num = new Integer(name); int index = num.intValue(); if (index < 0 || index > comments.length) { index = 0; } info.setText(comments[index]); } } }); } /** Returns an ImageIcon, or null if the path was invalid. */ protected static ImageIcon createImageIcon(String path, String description) { java.net.URL imageURL = TrackFocusDemo.class.getResource(path); if (imageURL == null) { System.err.println("Resource not found: " + path); return null; } else { return new ImageIcon(imageURL, description); } } /** * 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("TrackFocusDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JComponent newContentPane = new TrackFocusDemo(); 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) { /* Use an appropriate Look and Feel */ try { //UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel"); //UIManager.setLookAndFeel("com.sun.java.swing.plaf.gtk.GTKLookAndFeel"); UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel"); } catch (UnsupportedLookAndFeelException ex) { ex.printStackTrace(); } catch (IllegalAccessException ex) { ex.printStackTrace(); } catch (InstantiationException ex) { ex.printStackTrace(); } catch (ClassNotFoundException ex) { ex.printStackTrace(); } /* Turn off metal's use of bold fonts */ UIManager.put("swing.boldMetal", Boolean.FALSE); //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(); } }); } }