AIR-最小化到系统托盘

package   {import flash.desktop.*;import flash.display.*;import flash.events.*;import flash.net.*;/** * 最小化后生成系统托盘处理类 */public class SystemTray extends Sprite{private var dockImage:BitmapData;//托盘图标public function SystemTray(){}public function createSystemTray():void{var loader:Loader=new Loader();loader.contentLoaderInfo.addEventListener(Event.COMPLETE, prepareForSystray);loader.load(new URLRequest("../assets/icon32.png")); //加载托盘图标的小图片stage.nativeWindow.addEventListener(Event.CLOSING, closingApplication); //监听关闭窗体事件stage.nativeWindow.addEventListener(NativeWindowDisplayStateEvent.DISPLAY_STATE_CHANGING, nwMinimized);//监听最小化窗体事件}//关闭窗体的事件 private function closingApplication(event:Event):void{        closeApp(event);}//生成托盘 private function prepareForSystray(event:Event):void{dockImage=event.target.content.bitmapData;if (NativeApplication.supportsSystemTrayIcon){setSystemTrayProperties(); //设置托盘菜单的事件 SystemTrayIcon(NativeApplication.nativeApplication.icon).menu=createSystrayRootMenu(); //生成托盘菜单   }}//生成托盘菜单项 private function createSystrayRootMenu():NativeMenu{var menu:NativeMenu=new NativeMenu();//菜单var openNativeMenuItem:NativeMenuItem=new NativeMenuItem("打开"); //菜单子项var exitNativeMenuItem:NativeMenuItem=new NativeMenuItem("退出");  openNativeMenuItem.addEventListener(Event.SELECT, undock);exitNativeMenuItem.addEventListener(Event.SELECT, closeApp); menu.addItem(openNativeMenuItem);//将菜单项加入菜单menu.addItem(new NativeMenuItem("", true)); //菜单子项分隔符menu.addItem(exitNativeMenuItem); //将菜单项加入菜单 return menu;}//设置托盘图标的事件   private function setSystemTrayProperties():void{SystemTrayIcon(NativeApplication.nativeApplication.icon).tooltip="教师助手";SystemTrayIcon(NativeApplication.nativeApplication.icon).addEventListener(MouseEvent.CLICK, undock);}//最小化窗体   public function nwMinimized(event:NativeWindowDisplayStateEvent):void{if(event.afterDisplayState ==  "minimized")dock(); }//将本地应用程序放到托盘   private function dock():void{stage.nativeWindow.visible=false; //设置本地程序窗体不可见   NativeApplication.nativeApplication.icon.bitmaps=[dockImage]; //设置托盘的图标   }//激活程序窗体   private function undock(evt:Event):void{stage.nativeWindow.restore();stage.nativeWindow.visible=true; //设置本地程序窗体可见   stage.nativeWindow.orderToFront(); //设置本地程序窗体到最前端   NativeApplication.nativeApplication.icon.bitmaps=[]; //将托盘图标清空  }//关闭程序窗体   private function closeApp(evt:Event):void{stage.nativeWindow.close();}}}