1    package j2d.gui; 
2     
3    import javax.swing.*; 
4    import javax.swing.event.MenuEvent; 
5    import javax.swing.event.MenuListener; 
6    import java.awt.event.ActionEvent; 
7    import java.awt.event.ActionListener; 
8    import java.beans.PropertyVetoException; 
9     
10   /** 
11    * Menu component that handles the functionality expected of a standard 
12    * "Windows" menu for MDI applications. 
13    * <p/> 
14    * Modified from 
15    * <a href = http://www.javaworld.com/javaworld/jw-05-2001/jw-0525-mdi.html> 
16    * Javaworld web site</a> 
17    */ 
18   public class WindowMenu extends JMenu { 
19       private MDIDesktopPane desktop; 
20       private JMenuItem cascade = new JMenuItem("Cascade"); 
21   //    private JMenuItem tile=new JMenuItem("Tile"); 
22    
23       /** 
24        * Adds a window menu to the specified desktop pane. 
25        */ 
26    
27       public WindowMenu(MDIDesktopPane desktop) { 
28           this.desktop = desktop; 
29           setText("Window"); 
30           cascade.addActionListener(new ActionListener() { 
31               public void actionPerformed(ActionEvent ae) { 
32                   WindowMenu.this.desktop.cascadeFrames(); 
33               } 
34           }); 
35           /* 
36           tile.addActionListener(new ActionListener() { 
37               public void actionPerformed(ActionEvent ae) { 
38                   WindowMenu.this.desktop.tileFrames(); 
39               } 
40           }); 
41           */ 
42           addMenuListener(new MenuListener() { 
43               public void menuCanceled(MenuEvent e) { 
44               } 
45    
46               public void menuDeselected(MenuEvent e) { 
47                   removeAll(); 
48               } 
49    
50               public void menuSelected(MenuEvent e) { 
51                   buildChildMenus(); 
52               } 
53           }); 
54       } 
55    
56       /* Sets up the children menus depending on the current desktop state */ 
57       private void buildChildMenus() { 
58           int i; 
59           ChildMenuItem menu; 
60           JInternalFrame[] array = desktop.getAllFrames(); 
61    
62           add(cascade); 
63   //        add(tile); 
64           if (array.length > 0) addSeparator(); 
65           cascade.setEnabled(array.length > 0); 
66   //        tile.setEnabled(array.length > 0); 
67    
68           for (i = 0; i < array.length; i++) { 
69               menu = new ChildMenuItem(array[i]); 
70               menu.setState(i == 0); 
71               menu.addActionListener(new ActionListener() { 
72                   public void actionPerformed(ActionEvent ae) { 
73                       JInternalFrame frame = ((ChildMenuItem) ae.getSource()).getFrame(); 
74                       frame.moveToFront(); 
75                       try { 
76                           frame.setSelected(true); 
77                       } catch (PropertyVetoException e) { 
78                           e.printStackTrace(); 
79                       } 
80                   } 
81               }); 
82               menu.setIcon(array[i].getFrameIcon()); 
83               add(menu); 
84           } 
85       } 
86    
87       /** 
88        * This JCheckBoxMenuItem descendant is used to track the child frame that corresponds 
89        * to a given menu. 
90        */ 
91       class ChildMenuItem extends JCheckBoxMenuItem { 
92           private JInternalFrame frame; 
93    
94           public ChildMenuItem(JInternalFrame frame) { 
95               super(frame.getTitle()); 
96               this.frame = frame; 
97           } 
98    
99           public JInternalFrame getFrame() { 
100              return frame; 
101          } 
102      } 
103  } 
104