利用擴展點快速爲工具欄加個下拉列表〔效果同：debug下拉〕

 <action
       class="com.abc.CallAction"
               icon="icons/statistic_icon.png"
               id="com.abc.calltime"
               label="&Call" 
               style="pulldown" toolbarPath="com.abcxxx.caltime/callGroup"
               tooltip="ssssssssss">
         </action>

對應的Action

public class CallAction extends Action
implements IMenuCreator, IWorkbenchWindowPulldownDelegate2 {

	IWorkbenchWindow window = null;
	private MenuManager dropDownMenuMgr;
	private Action firstAction;
	private Action secondAction; 

	public CallAction(){
	     setMenuCreator(this);
	} 

	@Override
	public void init(IWorkbenchWindow window) {
		this.window = window; 
	}

	@Override
	public void run(IAction action) {}  

	public void setEnabled( boolean enabled ){}

	@Override
	public void selectionChanged(IAction action, ISelection selection) {}
	  class InnerAction extends Action{
	    	private String text;
	    	InnerAction(String text){
	    		super(text);
	    		this.text = text;
	    	}
	    	@Override
	    	public void run() {
	    		super.run(); 
	    		if("One".equals(text)){
	    			//do one something
	    			secondAction.setEnabled(true);
	    		}else{
	    			//do two something
	    			firstAction.setEnabled(true);
	    		}
	    		this.setEnabled(false);
	    	}
	    }
	@Override
	public void dispose() {

		  if(null != dropDownMenuMgr){
				dropDownMenuMgr.dispose();
				dropDownMenuMgr = null;
			}
	}

	@Override
	public Menu getMenu(Control parent) { 
		createDropDownMenuMgr(); 
		return dropDownMenuMgr.createContextMenu(parent);
    }

	private void createDropDownMenuMgr() {		
		if (dropDownMenuMgr == null) {			
			dropDownMenuMgr = new MenuManager();	
			firstAction = new InnerAction("One");
			dropDownMenuMgr.add(firstAction);	
			secondAction = new InnerAction("Two");
			dropDownMenuMgr.add(secondAction);	 
			}	
		}

	@Override
	public Menu getMenu(Menu parent) {
		return null;
	}
}