Mega Code Archive
Implements InternalFrameListener
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/* From http://java.sun.com/docs/books/tutorial/index.html */
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/*
* InternalFrameEventDemo.java is a 1.4 example that requires no other files.
*/
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.WindowConstants;
import javax.swing.event.InternalFrameEvent;
import javax.swing.event.InternalFrameListener;
public class InternalFrameEventDemo extends JFrame implements
InternalFrameListener, ActionListener {
JTextArea display;
JDesktopPane desktop;
JInternalFrame displayWindow;
JInternalFrame listenedToWindow;
static final String SHOW = "show";
static final String CLEAR = "clear";
String newline = "\n";
static final int desktopWidth = 500;
static final int desktopHeight = 300;
public InternalFrameEventDemo(String title) {
super(title);
//Set up the GUI.
desktop = new JDesktopPane();
desktop.putClientProperty("JDesktopPane.dragMode", "outline");
//Because we use pack, it's not enough to call setSize.
//We must set the desktop's preferred size.
desktop.setPreferredSize(new Dimension(desktopWidth, desktopHeight));
setContentPane(desktop);
createDisplayWindow();
desktop.add(displayWindow); //DON'T FORGET THIS!!!
Dimension displaySize = displayWindow.getSize();
displayWindow.setSize(desktopWidth, displaySize.height);
}
//Create the window that displays event information.
protected void createDisplayWindow() {
JButton b1 = new JButton("Show internal frame");
b1.setActionCommand(SHOW);
b1.addActionListener(this);
JButton b2 = new JButton("Clear event info");
b2.setActionCommand(CLEAR);
b2.addActionListener(this);
display = new JTextArea(3, 30);
display.setEditable(false);
JScrollPane textScroller = new JScrollPane(display);
//Have to supply a preferred size, or else the scroll
//area will try to stay as large as the text area.
textScroller.setPreferredSize(new Dimension(200, 75));
textScroller.setMinimumSize(new Dimension(10, 10));
displayWindow = new JInternalFrame("Event Watcher", true, //resizable
false, //not closable
false, //not maximizable
true); //iconifiable
JPanel contentPane = new JPanel();
contentPane.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
contentPane.setLayout(new BoxLayout(contentPane, BoxLayout.PAGE_AXIS));
b1.setAlignmentX(CENTER_ALIGNMENT);
contentPane.add(b1);
contentPane.add(Box.createRigidArea(new Dimension(0, 5)));
contentPane.add(textScroller);
contentPane.add(Box.createRigidArea(new Dimension(0, 5)));
b2.setAlignmentX(CENTER_ALIGNMENT);
contentPane.add(b2);
displayWindow.setContentPane(contentPane);
displayWindow.pack();
displayWindow.setVisible(true);
}
public void internalFrameClosing(InternalFrameEvent e) {
displayMessage("Internal frame closing", e);
}
public void internalFrameClosed(InternalFrameEvent e) {
displayMessage("Internal frame closed", e);
}
public void internalFrameOpened(InternalFrameEvent e) {
displayMessage("Internal frame opened", e);
}
public void internalFrameIconified(InternalFrameEvent e) {
displayMessage("Internal frame iconified", e);
}
public void internalFrameDeiconified(InternalFrameEvent e) {
displayMessage("Internal frame deiconified", e);
}
public void internalFrameActivated(InternalFrameEvent e) {
displayMessage("Internal frame activated", e);
}
public void internalFrameDeactivated(InternalFrameEvent e) {
displayMessage("Internal frame deactivated", e);
}
//Add some text to the text area.
void displayMessage(String prefix, InternalFrameEvent e) {
String s = prefix + ": " + e.getSource();
display.append(s + newline);
display.setCaretPosition(display.getDocument().getLength());
}
//Handle events on the two buttons.
public void actionPerformed(ActionEvent e) {
if (SHOW.equals(e.getActionCommand())) {
//They clicked the Show button.
//Create the internal frame if necessary.
if (listenedToWindow == null) {
listenedToWindow = new JInternalFrame("Event Generator", true, //resizable
true, //closable
true, //maximizable
true); //iconifiable
//We want to reuse the internal frame, so we need to
//make it hide (instead of being disposed of, which is
//the default) when the user closes it.
listenedToWindow
.setDefaultCloseOperation(WindowConstants.HIDE_ON_CLOSE);
//Add an internal frame listener so we can see
//what internal frame events it generates.
listenedToWindow.addInternalFrameListener(this);
//And we mustn't forget to add it to the desktop pane!
desktop.add(listenedToWindow);
//Set its size and location. We'd use pack() to set the size
//if the window contained anything.
listenedToWindow.setSize(300, 100);
listenedToWindow.setLocation(desktopWidth / 2
- listenedToWindow.getWidth() / 2, desktopHeight
- listenedToWindow.getHeight());
}
//Show the internal frame.
listenedToWindow.setVisible(true);
} else { //They clicked the Clear button.
display.setText("");
}
}
/**
* 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 InternalFrameEventDemo("InternalFrameEventDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//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();
}
});
}
}
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