Eclipse 插件开发 - 工具栏(tool bar)增加下来菜单

在开发Eclipse 插件时, 想在工具栏中增加一个按钮图标是非常容易, 但是想在图标上增加子菜单就会比较麻烦, 例如想实现如下效果: 

具体步骤如下:

1. 首先在扩展点org.eclipse.ui.commands中增加三个指令
   
   
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   1. <extension  
   2.     point="org.eclipse.ui.commands">  
   3.        
   4.     <command  
   5.         name="Reference Command"  
   6.         id="top.itart.plugin.smartboot.referenceCommand">  
   7.     </command>  
   8.    
   9.     <command   
   10.         name="Sub1 Command"   
   11.         id="top.itart.plugin.smartboot.sub1Command">  
   12.     </command>  
   13.    
   14.     <command  
   15.         name="Sub2 Command"  
   16.         id="top.itart.plugin.smartboot.sub2Command">  
   17.     </command>  
   18.         
   19. </extension>  
   
   
   
2. 其次在扩展点org.eclipse.ui.menus 增加两个menuContribution
   
   
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   1. <menuContribution  
   2.     locationURI="toolbar:org.eclipse.ui.main.toolbar?after=additions">  
   3.     <toolbar  
   4.        id="top.itart.plugin.smartboot.toolbars">  
   5.         <command  
   6.               commandId="top.itart.plugin.smartboot.referenceCommand"  
   7.               icon="icons/sample.gif"  
   8.               tooltip="Pull down" style="pulldown">  
   9.         </command>  
   10.     </toolbar>  
   11. </menuContribution>  
   
   这个是定义显示在toolbar上的菜单. Command 中的commandId 为第一个指令的ID, 类型 type 为pulldown, 并且放在toolbar标签中
   
   
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   1. <menuContribution  
   2.     locationURI="menu:top.itart.plugin.smartboot.referenceCommand">  
   3.     <command  
   4.               commandId="top.itart.plugin.smartboot.sub1Command"  
   5.               icon="icons/sample.gif"  
   6.               label = "Sub 1"  
   7.               tooltip="Sub 1">  
   8.     </command>  
   9.     <command  
   10.         commandId="top.itart.plugin.smartboot.sub2Command"  
   11.         icon="icons/sample.gif"  
   12.         tooltip="Sub2"  
   13.         label = "Sub 2">  
   14.     </command>  
   15. </menuContribution>  
   
   这个menuContribution是定义下拉的子菜单. 注意locationURI的值是menu: <Toolbar上的菜单ID>
   
   

• 最终的plugin.xml如下

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1. <?xml version="1.0" encoding="UTF-8"?>  
2. <?eclipse version="3.4"?>  
3. <plugin>  
4.   
5.     <extension  
6.         point="org.eclipse.ui.commands">  
7.            
8.         <command  
9.             name="Reference Command"  
10.             id="top.itart.plugin.smartboot.referenceCommand">  
11.         </command>  
12.        
13.         <command   
14.             name="Sub1 Command"   
15.             id="top.itart.plugin.smartboot.sub1Command">  
16.         </command>  
17.        
18.         <command  
19.             name="Sub2 Command"  
20.             id="top.itart.plugin.smartboot.sub2Command">  
21.         </command>  
22.             
23.     </extension>  
24.      
25.      
26.    <extension  
27.          point="org.eclipse.ui.menus">  
28.         
29.         <menuContribution  
30.             locationURI="toolbar:org.eclipse.ui.main.toolbar?after=additions">  
31.             <toolbar  
32.                id="top.itart.plugin.smartboot.toolbars">  
33.                 <command  
34.                       commandId="top.itart.plugin.smartboot.referenceCommand"  
35.                       icon="icons/sample.gif"  
36.                       tooltip="Pull down" style="pulldown">  
37.                 </command>  
38.             </toolbar>  
39.         </menuContribution>  
40.         
41.         <menuContribution  
42.             locationURI="menu:top.itart.plugin.smartboot.referenceCommand">  
43.             <command  
44.                       commandId="top.itart.plugin.smartboot.sub1Command"  
45.                       icon="icons/sample.gif"  
46.                       label = "Sub 1"  
47.                       tooltip="Sub 1">  
48.             </command>  
49.             <command  
50.                 commandId="top.itart.plugin.smartboot.sub2Command"  
51.                 icon="icons/sample.gif"  
52.                 tooltip="Sub2"  
53.                 label = "Sub 2">  
54.             </command>  
55.         </menuContribution>  
56.         
57.     </extension>  
58.   
59. </plugin>