AS3.0自定义滚动条（滚动内容可以为Sprite或MovieClip等）
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本文转自：http://www.cnblogs.com/zhoujunfeng2011/archive/2011/07/15/2106989.html
AS3.0 实现自定义滚动条（滚动内容可以为Sprite 或 MovieClip等），修改属性类型即可！
源码：
Scrollbar.as
package ui { import flash.display.Sprite; import flash.events.MouseEvent; import flash.events.Event; import ui.ListenManager; import flash.geom.Rectangle; public class Scrollbar extends Sprite { public var obj:Sprite;//需进行滚动的对象 public var scrollmask:Sprite;//遮罩对象 public var scrollheight:Number;//滚动条高度 public var scrolltextnum:int;//文本显示行数 public var textspeed:int;//文本滚动速度（行/像素） public var Scroll:Sprite;//自定义滚动条对象 public var bar:Sprite;//滑块 public var up:Sprite;//向上按钮 public var down:Sprite;//向下按钮 public var bg:Sprite;//滑槽 public var displayobject:*;//接受stage，必须传入 public var num:int;//计算滑块高度所用 private var bars:Number;//滑块可滑动距离 private var rect:Rectangle;//滑块可拖动范围 private var i:int = 0; private var n:Number; private var listenmanager:ListenManager = new ListenManager();///监听管理器 ////构造器函数///// public function Scrollbar():void { } /////初始化函数///// public function init():void { if (checkhide()) { addEventListeners(); } else { bar.visible = false; } setxy(); } ///判断是否显示滚动条等/// private function checkhide():Boolean { if (Scroll != null) { if (obj.height <= scrollmask.height) { return false; } return true; } return false; } ///设置滚动条高度，对象遮罩等//// private function setxy():void { up.y = 1; bg.y = up.height; bar.x = 1.2; bar.y = bg.y; if (bar.height >= 10) { n = (obj.height - scrollmask.height)/(num+20); bar.height = scrollmask.height - (obj.height - scrollmask.height)/n; } bg.height = scrollheight; down.y = bg.y + bg.height; bars = bg.height - bar.height; obj.mask = scrollmask; rect = new Rectangle(bar.x,bg.y,0,bg.height - bar.height); } ///当被滚动对象更新时，而需要改变滚动条状态，调用此方法/// public function update(num:int):void { if (checkhide()) { i++; if (bar.height >= 10) { n = (obj.height - scrollmask.height)/(num+20); bar.height = scrollmask.height - (obj.height - scrollmask.height)/n; } bar.y = bg.y + bg.height - bar.height; bar.y += bars * textspeed /(obj.height - scrollmask.height); obj.y = scrollmask.y - obj.height + scrollmask.height; objrun(textspeed); updatebar(); bars = bg.height - bar.height; rect = new Rectangle(bar.x,bg.y,0,bg.height - bar.height); if (i == 1) { bar.visible = true; addEventListeners(); } } } ///为滚动条添加监听事件//// private function addEventListeners():void { listenmanager.fcn_add(bar,MouseEvent.MOUSE_DOWN,barclick); listenmanager.fcn_add(bar,MouseEvent.MOUSE_UP,barup); listenmanager.fcn_add(displayobject,MouseEvent.MOUSE_UP,barup); listenmanager.fcn_add(up,MouseEvent.MOUSE_DOWN,upclick); listenmanager.fcn_add(down,MouseEvent.MOUSE_DOWN,downclick); listenmanager.fcn_add(Scroll,MouseEvent.MOUSE_WHEEL,mousewheel); listenmanager.fcn_add(obj,MouseEvent.MOUSE_WHEEL,mousewheel); } ///鼠标点击滑块方法///; private function barclick(evt:MouseEvent):void { bar.startDrag(false,rect); listenmanager.fcn_add(bar,Event.ENTER_FRAME,bar_enter_frame); } ///鼠标点击滑块释放方法///; private function barup(evt:MouseEvent):void { bar.stopDrag(); delevent(); } ///鼠标点击向上按钮方法/// private function upclick(evt:MouseEvent):void { if (checkbar()) { bar.y -= bars * textspeed /(obj.height-scrollmask.height);//滑块移动的距离=滚动对象滚动的像素*滑块可移动的总距离/(被滚动对象的高度-遮罩的高度（即显示范围的高度)) objrun(0-textspeed); //调用方法移动对象; updatebar();//校正滑块位置 } } ///鼠标点击向下按钮方法/// private function downclick(evt:MouseEvent):void { if (checkbar()) { bar.y += bars * textspeed /(obj.height - scrollmask.height); objrun(textspeed); updatebar(); } } ///鼠标滑轮事件/// private function mousewheel(evt:MouseEvent):void { if (evt.delta > 0) { if (checkbar()) { bar.y -= bars * textspeed /(obj.height - scrollmask.height); objrun(-textspeed); updatebar(); } } else { if (checkbar()) { bar.y += bars * textspeed /(obj.height - scrollmask.height); objrun(textspeed); updatebar(); } } } private function bar_enter_frame(evt:Event):void { obj.y = scrollmask.y - (bar.y - bg.y)*(obj.height - scrollmask.height)/bars; if (obj.y > scrollmask.y) { obj.y = scrollmask.y; } else if (obj.y < (scrollmask.y - obj.height + scrollmask.height)) { obj.y = scrollmask.y - obj.height + scrollmask.height; } } private function objrun(i:Number):void { obj.y -= i; if (obj.y > scrollmask.y) { obj.y = scrollmask.y; } else if (obj.y < (scrollmask.y - obj.height + scrollmask.height)) { obj.y = scrollmask.y - obj.height + scrollmask.height; } } private function checkbar():Boolean { if (bar.y >= bg.y && bar.y <= (bars + bg.y)) { return true; } return false; } ///删除卸载事件侦听/// private function updatebar():void { if (bar.y < bg.y) { bar.y = bg.y; } else if (bar.y >(bg.y + bg.height - bar.height)) { bar.y = bg.y + bg.height - bar.height; } } private function delevent():void { listenmanager.fcn_del(bar,Event.ENTER_FRAME,bar_enter_frame); } } }ListenManager.as
package ui { import flash.display.Sprite; public class ListenManager extends Sprite { public function ListenManager() { } public function fcn_add(obj:*,_type:String,fcn:Function):void { obj.addEventListener(_type,fcn); } public function fcn_del(obj:*,_type:String,fcn:Function):void { obj.removeEventListener(_type,fcn); } } }package ui { import flash.display.Loader; public class loader extends Loader { private var Name:String; public function loader():void { } public function get Names():String { return Name; } public function set Names(myname:String):void { Name = myname; } } }package ui { import flash.display.Sprite; import flash.display.SimpleButton; import flash.text.TextField; import flash.text.TextFormat; import flash.text.TextFieldAutoSize; public class simple extends Sprite { private var btnw:Number; private var btnh:Number; private var downcolor:uint; private var upcolor:uint; private var overcolor:uint; private var lineStly:Boolean; public function simple():void { } public function getsimplebtn(str:String,btnw:Number = 50,btnh:Number = 30,downcolor:uint = 0x990066,upcolor:uint = 0xffffff,overcolor:uint = 0x666666,lineStly:Boolean = false):SimpleButton { this.name = str; this.btnw = btnw; this.btnh = btnh; this.downcolor = downcolor; this.upcolor = upcolor; this.overcolor = overcolor; this.lineStly = lineStly; var btn:SimpleButton = new SimpleButton(); btn.downState = downbtn(); btn.upState = upbtn(); btn.overState = overbtn(); btn.hitTestState = hitbtn(); return btn; } private function hitbtn():Sprite { var sprite:Sprite = new Sprite(); sprite.graphics.beginFill(upcolor); sprite.graphics.drawRect(0,0,btnw,btnh); sprite.graphics.endFill(); return sprite; } private function downbtn():Sprite { var txt:TextField = txtstr(this.name); var sprite:Sprite = DrawSprite(1); sprite.addChild(txt); return sprite; } private function upbtn():Sprite { var txt:TextField = txtstr(this.name); var sprite:Sprite = DrawSprite(0); sprite.addChild(txt); return sprite; } private function overbtn():Sprite { var txt:TextField = txtstr(this.name); var sprite:Sprite = DrawSprite(2); sprite.addChild(txt); return sprite; } private function txtstr(str:String):TextField { var txt:TextField = new TextField(); var format:TextFormat = new TextFormat(); format.font = "Verdana"; format.size = 12; txt.autoSize = TextFieldAutoSize.LEFT; txt.text = str; txt.setTextFormat(format); return txt; } private function DrawSprite(n:int):Sprite { var sprite:Sprite = new Sprite(); if (n == 0) { sprite.graphics.beginFill(upcolor); } else if (n == 1) { sprite.graphics.beginFill(downcolor); } else if (n == 2) { sprite.graphics.beginFill(overcolor); } if(lineStly) { sprite.graphics.lineStyle(1,0x660099); } sprite.graphics.drawRect(0,0,btnw,btnh); sprite.graphics.endFill(); return sprite; } } }文档类:Main.as
package { import flash.display.Sprite; import ui.simple; import ui.Scrollbar; import flash.display.SimpleButton; import flash.events.MouseEvent; import flash.display.Shape; import flash.net.URLLoader; import flash.events.Event; import flash.net.URLRequest; import ui.loader; import flash.display.Bitmap; import flash.text.TextField; public class Main extends Sprite { private var backbox:Sprite = new Sprite(); private var sprite:Sprite = new Sprite(); private var scrollcont:Sprite = new Sprite(); private var i:int = 0; private var j:int = -1; private var num:int; private var bg:Sprite = new Sprite(); private var bar:Sprite = new Sprite(); private var up:Sprite = new Sprite(); private var down:Sprite = new Sprite(); private var listscroll:Scrollbar = new Scrollbar(); public function Main():void { init(); } private function init():void { var urlloader:URLLoader = new URLLoader(); urlloader.addEventListener(Event.COMPLETE,com); urlloader.load(new URLRequest("http://files.cnblogs.com/zhoujunfeng2011/Pictures/data.xml")); } private function com(evt:Event):void { var myxml:XML = new XML(evt.target.data); num = myxml.child("pic").length(); for (var i:int =0; i<num; i++) { var myloader:loader = new loader(); myloader.contentLoaderInfo.addEventListener(Event.COMPLETE,piccom); myloader.load(new URLRequest(myxml.child("pic")[i].@url)); myloader.Names = myxml.child("pic")[i]. @ name; } } private function piccom(evt:Event):void { j++; var myloader:loader = loader(evt.target.loader); var bitmap:Bitmap = Bitmap(myloader.content); var sprite:Sprite = new Sprite(); sprite.addChild(bitmap); switch (myloader.Names) { case "滑块" : bar = sprite; break; case "滑槽" : bg = sprite; break; case "向上" : up = sprite; break; case "向下" : down = sprite; break; } if (j == num-1) { uiinit(); } } private function uiinit():void { var btn:simple = new simple(); var spmask:Sprite = new Sprite(); var Test_btn:SimpleButton; backbox.graphics.beginFill(0xffffff); backbox.graphics.lineStyle(1,0x660099); backbox.graphics.drawRect(0,0,200,241); backbox.graphics.endFill(); backbox.y = 10; addChild(backbox); scrollcont.x = backbox.width - 14; scrollcont.y = backbox.y; addChild(scrollcont); down.y = scrollcont.y; scrollcont.addChild(down); scrollcont.addChild(bg); scrollcont.addChild(up); scrollcont.addChild(bar); spmask.graphics.beginFill(0x000000); spmask.graphics.drawRect(0,0,backbox.width,backbox.height); spmask.graphics.endFill(); backbox.addChild(sprite); backbox.addChild(spmask); Test_btn = btn.getsimplebtn("点击添加",60,30,0xff00cc,0xcc00cc,0x9900cc); Test_btn.x = 65; Test_btn.y = backbox.height + 15; this.addChild(Test_btn); for (i; i< 120; i++) { var sbtn:simple = new simple(); var sp:SimpleButton; var str:String = i + 1 + " this is Testing!"; sp = sbtn.getsimplebtn(str,185,20,0x990099,0x66ffff,0x99ffff,true); sp.x = 1; sp.y = i * 20; sprite.addChild(sp); } listscroll.displayobject = this.stage; listscroll.obj = sprite; listscroll.scrollmask = spmask; listscroll.textspeed = 20; listscroll.Scroll = scrollcont; listscroll.scrollheight = 212; listscroll.up = up; listscroll.down = down; listscroll.bg = bg; listscroll.bar = bar; listscroll.num = i; listscroll.init(); Test_btn.addEventListener(MouseEvent.CLICK,Testbtn_click); } private function Testbtn_click(evt:MouseEvent):void { var sbtn:simple = new simple(); var sp:SimpleButton; var str:String = i + 1 + " this is Testing!"; sp = sbtn.getsimplebtn(str,185,20,0x990099,0x66ffff,0x99ffff,true); sp.x = 1; sp.y = i * 20; sprite.addChild(sp); listscroll.update(i); i++; } } }为图方便所以使用了SimpleButton类型作为列表中的内容，
，有些算法都是从网上收集起来的，不过稍改了下
，希望会对你有帮助，代码有点乱，看了后希望点评下，谢谢！最后加上XML内容：<?xml version="1.0" encoding="utf-8"?> <data> <pic name="滑槽" url="http://files.cnblogs.com/zhoujunfeng2011/Pictures/bg.png"/> <pic name="向上" url="http://files.cnblogs.com/zhoujunfeng2011/Pictures/up.png"/> <pic name="向下" url="http://files.cnblogs.com/zhoujunfeng2011/Pictures/down.png"/> <pic name="滑块" url="http://files.cnblogs.com/zhoujunfeng2011/Pictures/bar.png"/> </data>
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