xworker.swt.actions.ShellActions Maven / Gradle / Ivy

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/*******************************************************************************
* Copyright 2007-2013 See AUTHORS file.
 * 
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* 
*   http://www.apache.org/licenses/LICENSE-2.0
* 
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
package xworker.swt.actions;

import org.eclipse.swt.widgets.Display;
import org.xmeta.ActionContext;

public class ShellActions {
	public static void systemExitOnNoActiveWindow(ActionContext actionContext){
		int activeCount = Thread.currentThread().getThreadGroup().getParent().activeCount();
		Thread[] threads = new Thread[activeCount];
		Thread.currentThread().getThreadGroup().getParent().enumerate(threads);
		
		final Checker checker = new Checker();
		for(Thread thread : threads){
			if(thread != null){
				Display display = Display.findDisplay(thread);
				if(display != null && display != Display.getCurrent()){
					checker.addThread();
					display.asyncExec(new Runnable(){
						public void run(){
							try{
								if(Display.getCurrent().getActiveShell() != null){
									checker.have = true;
								}
							}finally{
								checker.removeThread();
							}
						}
					});
				}
			}
		}

		int count = 0;
		while(checker.getThreadCount() > 0){
			try{
				Thread.sleep(1000);
			}catch(Exception e){				
			}
			
			count ++;
			if(count > 3){
				//如果超出三秒还未判断完毕，直接返回，可能还有界面事物
				return;
			}
		}
				
		if(!checker.have){
			if(Display.getCurrent().getActiveShell() == null){
				System.exit(0);
			}
		}
	}
	
	public static class Checker{
		public boolean have = false;
		int threadCount = 0;
		
		public synchronized void addThread(){
			threadCount++;
		}
		
		public synchronized void removeThread(){
			threadCount--;
		}
		
		public int getThreadCount(){
			return threadCount;
		}
	}
}