import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.event.*; 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.Y_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.show(); //necessary as of 1.3 } //Create the listened-to window. protected void createListenedToWindow() { listenedToWindow = new JInternalFrame("Event Generator", true, //resizable true, //closable true, //maximizable true); //iconifiable //The next statement is necessary to work around bug 4138031. listenedToWindow.setDefaultCloseOperation( WindowConstants.DISPOSE_ON_CLOSE); listenedToWindow.setSize(300, 100); } public void internalFrameClosing(InternalFrameEvent e) { displayMessage("Internal frame closing", e); } public void internalFrameClosed(InternalFrameEvent e) { displayMessage("Internal frame closed", e); listenedToWindow = null; } public void internalFrameOpened(InternalFrameEvent e) { //XXX: We don't seem to get any of these. 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); } void displayMessage(String prefix, InternalFrameEvent e) { String s = prefix + ": " + e.getSource(); display.append(s + newline); } public void actionPerformed(ActionEvent e) { if (e.getActionCommand().equals(SHOW)) { //XXX: Can't reuse internal frame (bug 4138031). //listenedToWindow.setVisible(true); //XXX: Instead, create a new internal frame. if (listenedToWindow == null) { createListenedToWindow(); listenedToWindow.addInternalFrameListener(this); desktop.add(listenedToWindow); listenedToWindow.setLocation( desktopWidth/2 - listenedToWindow.getWidth()/2, desktopHeight - listenedToWindow.getHeight()); listenedToWindow.show(); //necessary as of 1.3 } } else { display.setText(""); } } public static void main(String[] args) { JFrame frame = new InternalFrameEventDemo( "InternalFrameEventDemo"); //Quit this app when the big window closes. frame.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }); frame.pack(); frame.setVisible(true); } }