Java Tutorial/Swing Event/InternalFrameListener

InternalFrameEvent Event Subtypes

Event Subtype IDAssociated Interface MethodINTERNAL_FRAME_ACTIVATEDinternalFrameActivatedINTERNAL_FRAME_CLOSEDinternalFrameClosedINTERNAL_FRAME_CLOSINGinternalFrameClosingINTERNAL_FRAME_DEACTIVATEDinternalFrameDeactivatedINTERNAL_FRAME_DEICONIFIEDinternalFrameDeiconifiedINTERNAL_FRAME_FIRSTN/AINTERNAL_FRAME_ICONIFIEDinternalFrameIconifiedINTERNAL_FRAME_LASTN/AINTERNAL_FRAME_OPENEDinternalFrameOpened

InternalFrameListener and InternalFrameEvent

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/*
 * InternalFrameEventDemo.java 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();
      }
    });
  }
}

Listening to InternalFrameListener

public interface InternalFrameListener extends EventListener {
  public void internalFrameActivated(InternalFrameEvent internalFrameEvent);
  public void internalFrameClosed(InternalFrameEvent internalFrameEvent);
  public void internalFrameClosing(InternalFrameEvent internalFrameEvent);
  public void internalFrameDeactivated(InternalFrameEvent internalFrameEvent);
  public void internalFrameDeiconified(InternalFrameEvent internalFrameEvent);
  public void internalFrameIconified(InternalFrameEvent internalFrameEvent);
  public void internalFrameOpened(InternalFrameEvent internalFrameEvent);
}

Reports all internal frame events that occur on one internal frame

import java.awt.BorderLayout;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JLabel;
import javax.swing.event.InternalFrameEvent;
import javax.swing.event.InternalFrameListener;

public class InternalFrameListenerDemo {
  public static void main(final String[] args) {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JDesktopPane desktop = new JDesktopPane();
    JInternalFrame internalFrame = new JInternalFrame("Can Do All", true, true, true, true);
    desktop.add(internalFrame);
    internalFrame.setBounds(25, 25, 200, 100);
    JLabel label = new JLabel(internalFrame.getTitle(), JLabel.CENTER);
    internalFrame.add(label, BorderLayout.CENTER);
    internalFrame.setVisible(true);
    internalFrame.addInternalFrameListener(new InternalFrameListener(){
      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);
      }
       void displayMessage(String prefix, InternalFrameEvent e) {
          System.out.println(prefix + ": " + e.getSource());
      }
      
    });
    
    desktop.setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
    
    frame.add(desktop, BorderLayout.CENTER);
    frame.setSize(500, 300);
    frame.setVisible(true);
  }
}