动态更改Eclipse工具栏图标

Question

我有一个带有自己图标的工具栏项，在plugin.xml文件中定义如下：

<action
class="MyActionClass"
id="MyActionID"
label="MyActionLabel"
menubarPath="MyActionMenuBarPath"
toolbarPath="MyActionToolBarPath"
icon="icon/myicon.png" <---- this one
     ...
</action>

如何在需要时动态更改此设置？我的意思是从代码中改变它

Answer 1

使用org.eclipse.ui.menus扩展点，然后使用动态添加 menuContribution 。 动态的类应该是ControlContribution的子类并实现createControl方法来创建按钮。

Answer 2

您应该在implements课程中IElementUpdater Handler 请参阅：https://stackoverflow.com/a/23742598/2893073

1. 处理程序类

   import java.util.Map;    
   import org.eclipse.core.commands.AbstractHandler;
   import org.eclipse.core.commands.ExecutionEvent;
   import org.eclipse.core.commands.ExecutionException;
   import org.eclipse.jface.resource.ImageDescriptor;
   import org.eclipse.ui.commands.IElementUpdater;
   import org.eclipse.ui.menus.UIElement;    
   import com.packpub.e4.menu.Activator;     
   public class SampleHandler2 extends 
                AbstractHandler implements IElementUpdater{       
       private static ImageDescriptor image_enable = 
           Activator.getImageDescriptor("icons/btn_adapt_enable.png");
       private static ImageDescriptor image_disable = 
           Activator.getImageDescriptor("icons/btn_adapt_disable.png");        
       /**
        * The constructor.
        */
       public SampleHandler2() {
   
       }    
       /**
        * the command has been executed, so extract extract the needed information
        * from the application context.
        */
       public Object execute(ExecutionEvent event) throws ExecutionException {
           //...
           return null;
       }    
       @Override
       public void updateElement(UIElement element, @SuppressWarnings("rawtypes") Map map) {
           boolean condition = false;            
           //...            
           if( condition ) { 
               element.setIcon(image_disable);
           }else{
               element.setIcon(image_enable);
           }        
       }
   }
   

2. 使用ICommandService：

   调用此处理程序

       IWorkbenchWindow window = part.getSite().getWorkbenchWindow();
       ICommandService commandService = (ICommandService) window.getService(ICommandService.class);
       if (commandService != null) {
           commandService.refreshElements("com.packpub.e4.menu.commands.sampleCommand", null);
       }
   

感谢。