as3滚动条设计

as3自定义滚动条制作方法：

package
{
import flash.display.*;
import flash.events.*;
import flash.filters.*;
import flash.geom.*;
/**
* ...滚动条组件 * @author qxq */ public class Scrollbar extends Sprite { [Embed(source="../../../../../assets/images/skins/bar_darg.png")] private const RulerAsset:Class; [Embed(source="../../../../../assets/images/skins/sliderTrack.png")] private const SliderTrack:Class; static public const MARGIN_LEFT:uint = 3; private var _1124:Number; public var target:Sprite; public var background:ScaleBitmap; //public var _filter:BlurFilter; private var _11210:Number; private var _1133:Number; private var rect:Rectangle; public var maskmc:Sprite; //public var area:Sprite; public var ruler:Sprite; public var _1137:uint; public function Scrollbar(target:Sprite,rect:Rectangle) { this.target = target; this.rect = rect; addEventListener(Event.ADDED_TO_STAGE,onAddtoStage); return; } // end function public function onAddtoStage(param1:Event = null):void { _init(); //_filter = new BlurFilter(0,1); //this.target.filters = new Array(_filter); this.target.mask = this.maskmc; //this.target.cacheAsBitmap = true; this._11210 = background.y; this._1133 = background.y + background.height - ruler.height; this.ruler.buttonMode = true; this._1124 = target.y; //this._11210 = 0; this._1133 = this.background.height - this.ruler.height; ruler.addEventListener(MouseEvent.MOUSE_DOWN,onMouseDown); stage.addEventListener(MouseEvent.MOUSE_UP,onMouseUp); target.addEventListener(MouseEvent.MOUSE_WHEEL,onMouseWheel); this.addEventListener(Event.ENTER_FRAME,onEnterframe); return; } // end function private function onMouseUp(param1:MouseEvent):void { ruler.stopDrag(); return; } // end function public function reflush():void { var _loc_1:Number; var _loc_2:Number; var _loc_3:Number; var _loc_4:Number; var _loc_5:Number; var _loc_6:Number; var _loc_7:Number; var _loc_8:Number; _1137 = 100 / _1133 * ruler.y; _loc_1 = 0; _loc_2 = target.height - maskmc.height / 2 + 20; ruler.visible = target.height >= maskmc.height; _loc_4 = _1124 - (_loc_2 - maskmc.height / 2) / 100 * _1137; _loc_5 = target.y; _loc_6 = _loc_4; if (_loc_5 != _loc_6) { _loc_7 = _loc_6 - _loc_5; _loc_5 = _loc_5 + _loc_7 / 4; //_loc_8 = Math.abs(_loc_7) / 8; //_filter.blurY = _loc_8 / 2; //target.filters = new Array(_filter); } target.y = _loc_5; return; } // end function private function onEnterframe(param1:Event):void { reflush(); } private function _112f(param1:int):void { var _loc_2:Number; var _loc_3:Number; _loc_2 = (-param1) * 10; if (_loc_2 > 0) { _loc_3 = Math.min(_1133,ruler.y + _loc_2); } if (_loc_2 < 0) { _loc_3 = Math.max(_11210,ruler.y + _loc_2); } ruler.y = _loc_3; reflush(); } private function onMouseWheel(param1:MouseEvent):void { if (this.target.hitTestPoint(stage.mouseX,stage.mouseY,false)) { _112f(param1.delta); } return; } // end function public function _init():void { target.y = 0; // 1>? const bmp:Bitmap = new SliderTrack; background = new ScaleBitmap(bmp.bitmapData); background.height = rect.height; background.x = rect.width + MARGIN_LEFT; background.scale9Grid = new Rectangle(4,6,2,277); addChild(background); // 2>? ruler = new Sprite(); ruler.addChild(new RulerAsset); addChild(ruler); ruler.y = 0; ruler.x = rect.width + MARGIN_LEFT; // 3> Make mask mc; maskmc = new Sprite; maskmc.graphics.beginFill(0x000000); maskmc.graphics.drawRect(0,rect.width,rect.height); maskmc.graphics.endFill(); addChild(maskmc); return; } // end function private function onMouseDown(param1:MouseEvent):void { ruler.startDrag(false,new Rectangle(ruler.x,_11210,_1133)); trace(new Rectangle(ruler.x + ruler.width / 2,_1133)); } // end function } }