public class DesktopFrame extends JFrame
class MyJPanel extends JPanel
1: // Fig. 22.11: DesktopFrame.java
2: // Demonstrating JDesktopPane.
3: import java.awt.BorderLayout;
4: import java.awt.Dimension;
5: import java.awt.Graphics;
6: import java.awt.event.ActionListener;
7: import java.awt.event.ActionEvent;
8: import java.util.Random;
9: import javax.swing.JFrame;
10: import javax.swing.JDesktopPane;
11: import javax.swing.JMenuBar;
12: import javax.swing.JMenu;
13: import javax.swing.JMenuItem;
14: import javax.swing.JInternalFrame;
15: import javax.swing.JPanel;
16: import javax.swing.ImageIcon;
17:
18: public class DesktopFrame extends JFrame
19: {
20: private JDesktopPane theDesktop;
21:
22: // set up GUI
23: public DesktopFrame()
24: {
25: super( "Using a JDesktopPane" );
26:
27: JMenuBar bar = new JMenuBar(); // create menu bar
28: JMenu addMenu = new JMenu( "Add" ); // create Add menu
29: JMenuItem newFrame = new JMenuItem( "Internal Frame" );
30:
31: addMenu.add( newFrame ); // add new frame item to Add menu
32: bar.add( addMenu ); // add Add menu to menu bar
33: setJMenuBar( bar ); // set menu bar for this application
34:
35: theDesktop = new JDesktopPane(); // create desktop pane
36: add( theDesktop ); // add desktop pane to frame
37:
38: // set up listener for newFrame menu item
39: newFrame.addActionListener(
40:
41: new ActionListener() // anonymous inner class
42: {
43: // display new internal window
44: public void actionPerformed( ActionEvent event )
45: {
46: // create internal frame
47: JInternalFrame frame = new JInternalFrame(
48: "Internal Frame", true, true, true, true );
49:
50: MyJPanel panel = new MyJPanel(); // create new panel
51: frame.add( panel, BorderLayout.CENTER ); // add panel
52: frame.pack(); // set internal frame to size of contents
53:
54: theDesktop.add( frame ); // attach internal frame
55: frame.setVisible( true ); // show internal frame
56: } // end method actionPerformed
57: } // end anonymous inner class
58: ); // end call to addActionListener
59: } // end constructor DesktopFrame
60: } // end class DesktopFrame
61:
62: // class to display an ImageIcon on a panel
63: class MyJPanel extends JPanel
64: {
65: private static Random generator = new Random();
66: private ImageIcon picture; // image to be displayed
67: private String[] images = { "yellowflowers.png", "purpleflowers.png",
68: "redflowers.png", "redflowers2.png", "lavenderflowers.png" };
69:
70: // load image
71: public MyJPanel()
72: {
73: int randomNumber = generator.nextInt( 5 );
74: picture = new ImageIcon( images[ randomNumber ] ); // set icon
75: } // end MyJPanel constructor
76:
77: // display imageIcon on panel
78: public void paintComponent( Graphics g )
79: {
80: super.paintComponent( g );
81: picture.paintIcon( this, g, 0, 0 ); // display icon
82: } // end method paintComponent
83:
84: // return image dimensions
85: public Dimension getPreferredSize()
86: {
87: return new Dimension( picture.getIconWidth(),
88: picture.getIconHeight() );
89: } // end method getPreferredSize
90: } // end class MyJPanel
91:
92: /**************************************************************************
93: * (C) Copyright 1992-2005 by Deitel & Associates, Inc. and *
94: * Pearson Education, Inc. All Rights Reserved. *
95: * *
96: * DISCLAIMER: The authors and publisher of this book have used their *
97: * best efforts in preparing the book. These efforts include the *
98: * development, research, and testing of the theories and programs *
99: * to determine their effectiveness. The authors and publisher make *
100: * no warranty of any kind, expressed or implied, with regard to these *
101: * programs or to the documentation contained in these books. The authors *
102: * and publisher shall not be liable in any event for incidental or *
103: * consequential damages in connection with, or arising out of, the *
104: * furnishing, performance, or use of these programs. *
105: *************************************************************************/