flash拖拽事件

Flash拖拽事件的简便使用清单如下：启动类：tttpackage{import flash.display.Sprite;import flash.events.MouseEvent;public class ttt extends Sprite{private var me:ttt;private var ballV:Array = [];public function ttt(){me = this;var i:int = 0;while(i<15){var b:Ball = new Ball(i)me.addChild(b);ballV.push(b);b.addEventListener(MouseEvent.MOUSE_DOWN,onBallDown);i++;}flushXY();DragManager.init(stage);}/*** 当down的时候就把要检测的碰撞数组传入* @param event**/private function onBallDown(event:MouseEvent):void{DragManager.getInst().setHitObj(ballV,event.currentTarget,hitBack);}/*** 鼠标up的时候的回调* @param hitMC 被碰撞的原件* @param targetMC 拿去检测碰撞的原件* @return**/private function hitBack(hitMC,targetMC){if(!hitMC){return;}var hitMCIndex:int = ballV.indexOf(hitMC);ballV.splice(ballV.indexOf(targetMC),1)ballV.splice(hitMCIndex,0,targetMC);flushXY();}private function flushXY(){var i = 0;while(i<ballV.length){var b = ballV[i];b.x = 50 + Data.CircleSpX*int(i%8);b.y = 50 + Data.CircleSpY*int(i/8);i++;}}}}//***包外类生成一个圆形方便测试*/import flash.display.Sprite;import flash.geom.ColorTransform;import flash.text.TextField;class Ball extends Sprite{var me:Ball;var index:int = 0;function Ball(id){me = this;var t:TextField = new TextField;t.text = id + "";me.addChild(t);t.width = t.height = 20;me.graphics.beginFill(uint(Math.random()*0xffffff));me.graphics.drawCircle(Data.CircleWidth,Data.CircleWidth,Data.CircleWidth);me.graphics.endFill();}}********************************************************************************拖拽事件的封装类DragManager.aspackage{import flash.display.Bitmap;import flash.display.BitmapData;import flash.display.Stage;import flash.events.MouseEvent;import flash.geom.Matrix;import flash.geom.Rectangle;/*** 检测碰撞类* @author Ruien.Wu*/public class DragManager{public static var me:DragManager;private static var stage:Stage;/**复制的截图*/private var icon:Bitmap;/**检测碰撞的目标数组 */private var targetArr:Array;/**拖拽的对象*/private var dragObj:*;/**回调函数*/private var callBack:Function;/**可拖拽面积*/private var arenaRect:Rectangle;public function DragManager(){if(me){throw new Error("不能被实例化");}}/*** 初始化舞台*/public static function init(stg:Stage){stage = stg;}public static function getInst():DragManager{if(!me){me = new DragManager;}return me;}/*** 设置碰撞的数据* @param _tagetArr 目标数组,即要检测拖拽碰撞的对象数组* @param _dragObj 拖拽的对象* @param _func 回调* @return**/public function setHitObj(_tagetArr:Array,_dragObj,_func:Function){ targetArr = _tagetArr;dragObj = _dragObj;callBack = _func;if(dragObj.visible){dragObj.visible = false;}showIcon(dragObj);}/*** 设置参数* @param arena 可拖拽面积* @return**/public function setData(arena:Rectangle = null){if(arena){arenaRect = arena;}}/*** 创建个icon*/private function showIcon(obj):void{icon=createIcon(obj);icon.x=stage.mouseX-icon.width/2;icon.y=stage.mouseY-icon.height/2;stage.addChild(icon);stage.addEventListener(MouseEvent.MOUSE_MOVE,onMove);stage.addEventListener(MouseEvent.MOUSE_UP,onUp);}/*** 鼠标up*/private function onUp(e = null):void{var hitMC = checkHitArena(targetArr,icon);dragObj.visible = true;callBack(hitMC,dragObj);stage.removeEventListener(MouseEvent.MOUSE_MOVE,onMove);stage.removeEventListener(MouseEvent.MOUSE_UP,onUp);removeAll();}/*** 移动*/private function onMove(event:MouseEvent):void{icon.x=stage.mouseX-icon.width/2;icon.y=stage.mouseY-icon.height/2;if(arenaRect){if(arenaRect.x >icon.x){//左边icon.x = arenaRect.x;}if(icon.x>arenaRect.x + arenaRect.width){//右边icon.x = arenaRect.x + arenaRect.width;}if(icon.y<arenaRect.y){//上边icon.y = arenaRect.y}if(icon.y>arenaRect.y + arenaRect.height){//下面icon.y = arenaRect.y + arenaRect.height;}}}/*** 检测碰撞* @param target 目标数组* @param drag 拖拽的icon* @return**/private function checkHitArena(target:Array,drag:Bitmap):*{ var arenaArr:Array = [];for each(var m in target){if(drag.hitTestObject(m)&&m!=dragObj){return m;}}return null;}/*** 删除全部**/private function removeAll():void{if(icon){icon.bitmapData.dispose();stage.removeChild(icon);icon=null;}dragObj = null;targetArr = null;}/*** 创建个截图*/private function createIcon(sp):Bitmap{var b:Bitmap = new Bitmap;var realWidth:Number = sp.width/sp.scaleX;var realHeight:Number = sp.height/sp.scaleY;var mArr:Array = getMinXY(sp);var mBit:BitmapData = new BitmapData(realWidth,realHeight, true, 0);mBit.draw(sp,new Matrix(1,0,0,1,-mArr[0],-mArr[1]));b.bitmapData = mBit;b.width = sp.width;b.height = sp.height;return b;}/*** 获取最少坐标指，用于matrix* @param sp* @return**/private function getMinXY(sp):Array{var xArr:Array = [];var yArr:Array = [];for(var i:int = 0;i<sp.numChildren;i++){xArr.push(sp.getChildAt(i).x);yArr.push(sp.getChildAt(i).y);}xArr.sort(16);yArr.sort(16);return [xArr[0],yArr[0]];}}}*********************************************************************************** ***************************************************通过将mouseDown和mouseUp事件的封装，可以减少程序的逻辑判断，使代码简洁方便阅读。