SWT实现弹出日历控件

实现像网页上的那种用户单击一个Text框然后框下面出现一个日历控件，点击Text框以外的地方日历消失，怎么实现？

Java代码  

1. import  org.eclipse.swt.SWT;  
2. import  org.eclipse.swt.events.MouseAdapter;  
3. import  org.eclipse.swt.events.MouseEvent;  
4. import  org.eclipse.swt.graphics.Color;  
5. import  org.eclipse.swt.graphics.Point;  
6. import  org.eclipse.swt.widgets.Display;  
7. import  org.eclipse.swt.widgets.Shell;  
8. import  org.eclipse.swt.widgets.Text;  
9.   
10. public   class  DateTimeDemo  extends  Shell  
11. {  
12.     private   static  Display display;  
13.   
14.     private  Text text;  
15.   
16.     public   static   void  main(String args[])  
17.     {  
18.         try   
19.         {  
20.             display = Display.getDefault();  
21.             DateTimeDemo shell = new  DateTimeDemo(display, SWT.SHELL_TRIM);  
22.             shell.open();  
23.             shell.layout();  
24.   
25.             while (!shell.isDisposed())  
26.             {  
27.                 if (!display.readAndDispatch())  
28.                 {  
29.                     display.sleep();  
30.                 }  
31.             }  
32.   
33.             display.dispose();  
34.         }  
35.         catch (Exception e)  
36.         {  
37.             e.printStackTrace();  
38.         }  
39.     }  
40.   
41.     public  DateTimeDemo(Display display,  int  style)  
42.     {  
43.         super (display, style);  
44.         createContents();  
45.     }  
46.   
47.     protected   void  createContents()  
48.     {  
49.         setText("DateTime" );  
50.         setSize(471 ,  140 );  
51.         text = new  Text( this , SWT.BORDER);  
52.         text.setEditable(false );  
53.         text.setBackground(new  Color(display,  255 ,  255 ,  255 ));  
54.         text.setBounds(122 ,  41 ,  228 ,  25 );  
55.   
56.         text.addMouseListener(new  MouseAdapter()  
57.         {  
58.             public   void  mouseUp(MouseEvent e)  
59.             {  
60.                 DTDialog dialog = DTDialog.getInstance(DateTimeDemo.this );  
61.                 dialog.open();  
62.             }  
63.         });  
64.     }  
65.   
66.     public  Point getDtLocation()  
67.     {  
68.         return   new  Point(text.getLocation().x + DateTimeDemo. this .getLocation().x,  
69.                         text.getLocation().y + DateTimeDemo.this .getLocation().y +  60 );  
70.     }  
71.   
72.     public   void  setDate(String str)  
73.     {  
74.         text.setText(str);  
75.     }  
76.   
77.     @Override   
78.     protected   void  checkSubclass()  
79.     {  
80.     // Disable the check that prevents subclassing of SWT components   
81.     }  
82. }  

 

Java代码  

1. import  org.eclipse.swt.SWT;  
2. import  org.eclipse.swt.events.FocusAdapter;  
3. import  org.eclipse.swt.events.FocusEvent;  
4. import  org.eclipse.swt.events.SelectionAdapter;  
5. import  org.eclipse.swt.events.SelectionEvent;  
6. import  org.eclipse.swt.layout.FillLayout;  
7. import  org.eclipse.swt.widgets.DateTime;  
8. import  org.eclipse.swt.widgets.Dialog;  
9. import  org.eclipse.swt.widgets.Display;  
10. import  org.eclipse.swt.widgets.Shell;  
11.   
12. public   class  DTDialog  extends  Dialog  
13. {  
14.     private  Object result;  
15.   
16.     private  Shell shell;  
17.   
18.     private  DateTime dateTime;  
19.   
20.     private  DateTimeDemo parent;  
21.   
22.     private   static  DTDialog instance;  
23.   
24.     public   static  DTDialog getInstance(DateTimeDemo parent)  
25.     {  
26.         if (instance ==  null )  
27.         {  
28.             instance = new  DTDialog(parent);  
29.         }  
30.   
31.         return  instance;  
32.     }  
33.   
34.     private  DTDialog(DateTimeDemo parent)  
35.     {  
36.         super (parent, SWT.NO_TRIM);  
37.         this .parent = parent;  
38.     }  
39.   
40.     public  Object open()  
41.     {  
42.         if (shell ==  null  || shell.isDisposed())  
43.         {  
44.             createContents();  
45.             shell.open();  
46.             shell.layout();  
47.             Display display = getParent().getDisplay();  
48.   
49.             while (!shell.isDisposed())  
50.             {  
51.                 if (!display.readAndDispatch())  
52.                 {  
53.                     display.sleep();  
54.                 }  
55.             }  
56.   
57.             display.dispose();  
58.         }  
59.         else   
60.         {  
61.             shell.setLocation(parent.getDtLocation());  
62.             shell.setVisible(true );  
63.             shell.setFocus();  
64.         }  
65.   
66.         return  result;  
67.     }  
68.   
69.     protected   void  createContents()  
70.     {  
71.         shell = new  Shell(getParent(), SWT.NO_TRIM);  
72.         shell.setLayout(new  FillLayout());  
73.         shell.setSize(272 ,  140 );  
74.         shell.setLocation(parent.getDtLocation());  
75.         shell.setText("SWT Dialog" );  
76.         dateTime = new  DateTime(shell, SWT.CALENDAR);  
77.   
78.         dateTime.addSelectionListener(new  SelectionAdapter()  
79.         {  
80.             public   void  widgetSelected(SelectionEvent e)  
81.             {  
82.                 parent.setDate(formatDt());  
83.             }  
84.         });  
85.   
86.         dateTime.addFocusListener(new  FocusAdapter()  
87.         {  
88.             public   void  focusLost(FocusEvent e)  
89.             {  
90.                 parent.setDate(formatDt());  
91.                 shell.setVisible(false );  
92.             }  
93.         });  
94.     }  
95.   
96.     private  String formatDt()  
97.     {  
98.         return  dateTime.getYear() +  "-"  + dateTime.getMonth() +  "-"  + dateTime.getDay();  
99.     }  
100.   
101.     public  Shell getShell()  
102.     {  
103.         return  shell;  
104.     }  
105. }