TitleWindow designed to not be dragged outside Flex Application Area.

PopUpWindow.as

package net.odoe.components
{
	import flash.events.Event;
	
	import mx.core.FlexGlobals;
	import mx.events.CloseEvent;
	import mx.events.FlexEvent;
	import mx.logging.ILogger;
	import mx.managers.PopUpManager;
	
	import spark.components.TitleWindow;
	import spark.events.TitleWindowBoundsEvent;
	
	/**
	 * This TitleWindow is designed so that the window cannot be dragged outside
	 * the boundaries of the application. This component is made to be opened with <code>PopUpManager</code>
	 * so that when it is closed, it will be removed from <code>PopUpManager</code>.
	 * @author rrubalcava
	 */
	public class PopUpWindow extends TitleWindow
	{	
		public function PopUpWindow()
		{
			super();
			this.addEventListener(FlexEvent.CREATION_COMPLETE, onCreationComplete_handler, false, 0, true);
			this.addEventListener(CloseEvent.CLOSE, onCloseClicked_handler, false, 0, true);
			this.addEventListener(TitleWindowBoundsEvent.WINDOW_MOVE, onTitleWindowMove_handler, false, 0, true);
		}
		
		/**
		 * Right position of window when it opens.
		 * @default
		 */
		public var popupRight:Number;
		/**
		 * Left position of window when it opens.
		 * @default
		 */
		public var popupTop:Number;
		
		/**
		 * X postion of window when it opens.
		 * @default
		 */
		public var popupX:Number;
		/**
		 * Y postion of window when it opens.
		 * @default
		 */
		public var popupY:Number;
		
		/**
		 * Will remove all elements and this window from <code>PopUpManager</code>.
		 * @param e
		 */
		protected function onCloseClicked_handler(e:CloseEvent):void
		{
			this.removeEventListener(CloseEvent.CLOSE, onCloseClicked_handler);
			
			this.removeAllElements();
			PopUpManager.removePopUp(this);
		}
		
		/**
		 * Will assign given position assignments when window is created.
		 * @param e
		 */
		protected function onCreationComplete_handler(e:FlexEvent):void
		{
			this.removeEventListener(FlexEvent.CREATION_COMPLETE, onCreationComplete_handler);
			if (popupX > 0)
				this.x = popupX;
			else if (popupRight > 0)
				this.right = popupRight;
			if (popupY > 0)
				this.y = popupY;
			else if (popupTop > 0)
				this.top = popupTop;
		}
		
		/**
		 * Repositions window so that it cannot be dragged outside of <code>Application</code> area.
		 * @param event
		 */
		protected function onTitleWindowMove_handler(event:Event):void
		{
			var w:Number = FlexGlobals.topLevelApplication["width"];
			var h:Number = FlexGlobals.topLevelApplication["height"];
			if (this.x < 0)
				this.x = 5;
			if (this.y < 0)
				this.y = 5;
			if (this.x > w - 25)
				this.x = w - this.width;
			if (this.y > h - 25)
				this.y = h - this.height;
		}
	}
}