Java tutorial
/* * Copyright (c) 1995 - 2008 Sun Microsystems, Inc. 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 Sun Microsystems nor 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. */ /* * 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(); } }); } }