ComponentDrag约束窗口在一个容器内的拖动范围

// ActionScript filepackage com.sanguo.commons.utils{import flash.display.DisplayObject;import flash.events.Event;import flash.events.MouseEvent;import flash.geom.Rectangle;import mx.core.UIComponent;public class ComponentDrag{/** * 声明要拖动的窗口的约束窗口 */private var father:UIComponent;/** * 声明要拖动的窗口 */private var child:UIComponent;/** * 声明舞台 */private var stage:DisplayObject;/** * 事件的宽度 */private var height:Number;/** * 带参构造 * 参数为： * father:UIComponent---要拖动窗口的约束窗口 * child:UIComponent---要拖动的窗口 * stage:DisplayObject---舞台 */public function ComponentDrag(father:UIComponent,child:UIComponent,stage:DisplayObject,height:Number){this.setChild(child);this.setFather(father);this.setStage(stage);this.setHeight(height);}public function setHeight(height:Number):void{this.height=height;}public function getHeight():Number{return height;}/** * father:UIComponent的set方法 */public function setFather(father:UIComponent):void{this.father=father;}/** * father:UIComponent的get方法 * 返回值为father:UIComponent */public function getFather():UIComponent{return father;}/** * child:UIComponent的set方法 */public function setChild(child:UIComponent):void{this.child=child;}/** * child:UIComponent的get方法 * 返回值为 child:UIComponent */public function getChild():UIComponent{return child;}/** * stage:DisplayObject的set方法 */public function setStage(stage:DisplayObject):void{this.stage=stage;}/** * stage:DisplayObject的get方法 * 返回值为stage:DisplayObject */public function getStage():DisplayObject{return stage;}/** * 注册窗口拖动时的事件 */public function init():void{child.addEventListener(MouseEvent.MOUSE_DOWN,mouseHandle);//child.addEventListener(MouseEvent.MOUSE_UP,mouseHandle);stage.addEventListener(MouseEvent.MOUSE_UP,mouseHandle);//child.addEventListener(MouseEvent.MOUSE_OUT,mouseHandle);child.addEventListener(MouseEvent.MOUSE_MOVE,titleInit);}public function titleInit(event:MouseEvent):void{var reX:Number=child.x;var reY:Number=child.y;var rect:Rectangle=new Rectangle(reX,reY,child.width,height);if(rect.contains(event.stageX,event.stageY)){child.addEventListener(MouseEvent.MOUSE_DOWN,mouseHandle);//child.addEventListener(MouseEvent.MOUSE_OUT,mouseHandle);}else{child.removeEventListener(MouseEvent.MOUSE_DOWN,mouseHandle);}stage.addEventListener(MouseEvent.MOUSE_UP,mouseHandle,true);}/** * 设置startDrag */private function componentStartDrag(event:Event):void{ var pWidth:Number=father.width; var pHeight:Number=father.height; var tWidth:Number=child.width; var tHeight:Number=child.height; var xwidth:Number=pWidth-tWidth; var xheight:Number=pHeight-tHeight; var reX:Number=father.x; var reY:Number=father.y; var rect:Rectangle=new Rectangle(reX,reY,xwidth,xheight); child.startDrag(false,rect); } /** * 设置stopDrag */ private function componentStopDrag(event:Event):void{ child.stopDrag(); //event.stopPropagation(); } /** *根据event.type的不同值来调用不同方法 */ private function mouseHandle(event:Event):void{ if(event.type==MouseEvent.MOUSE_DOWN){ componentStartDrag(event); }else if(event.type==MouseEvent.MOUSE_UP){ componentStopDrag(event); }else if(event.type==MouseEvent.MOUSE_OUT){ componentStopDrag(event); } }}}