Track Focus Demo
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/*
* TrackFocusDemo.java is a 1.4 example that 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 java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.Image;
import java.awt.KeyboardFocusManager;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.accessibility.Accessible;
import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
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() != null)
&& ((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() {
//Make sure we have nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);
//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) {
//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();
}
});
}
}
/*
* Picture.java is used by the 1.4 TrackFocusDemo.java and DragPictureDemo.java
* examples.
*/
class Picture extends JComponent implements MouseListener, FocusListener,
Accessible {
Image image;
public Picture(Image image) {
this.image = image;
setFocusable(true);
addMouseListener(this);
addFocusListener(this);
}
public void mouseClicked(MouseEvent e) {
//Since the user clicked on us, let's get focus!
requestFocusInWindow();
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
public void mousePressed(MouseEvent e) {
}
public void mouseReleased(MouseEvent e) {
}
public void focusGained(FocusEvent e) {
//Draw the component with a red border
//indicating that it has focus.
this.repaint();
}
public void focusLost(FocusEvent e) {
//Draw the component with a black border
//indicating that it doesn't have focus.
this.repaint();
}
protected void paintComponent(Graphics graphics) {
Graphics g = graphics.create();
//Draw in our entire space, even if isOpaque is false.
g.setColor(Color.WHITE);
g.fillRect(0, 0, image == null ? 125 : image.getWidth(this),
image == null ? 125 : image.getHeight(this));
if (image != null) {
//Draw image at its natural size of 125x125.
g.drawImage(image, 0, 0, this);
}
//Add a border, red if picture currently has focus
if (isFocusOwner()) {
g.setColor(Color.RED);
} else {
g.setColor(Color.BLACK);
}
g.drawRect(0, 0, image == null ? 125 : image.getWidth(this),
image == null ? 125 : image.getHeight(this));
g.dispose();
}
}
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