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Actionscript 3 滚动窗格设置滚动位置

actionscript-3

Actionscript 3 滚动窗格设置滚动位置,actionscript-3,Actionscript 3,我无法从actionscript中控制滚动窗格的滚动（我使用的是actionscript 3.0） 以下是我的定义： var scrollPane:ScrollPane = new ScrollPane(); scrollPane.verticalScrollPolicy = "false"; scrollPane.move(374, 0); scrollPane.setSize(476, 370); 当我尝试设置它时-scrollPane.horizontalcrollposition=50

我无法从actionscript中控制滚动窗格的滚动（我使用的是actionscript 3.0）

以下是我的定义：

var scrollPane:ScrollPane = new ScrollPane();
scrollPane.verticalScrollPolicy = "false";
scrollPane.move(374, 0);
scrollPane.setSize(476, 370);
当我尝试设置它时-scrollPane.horizontalcrollposition=500；我发现以下错误

TypeError: Error #1009: Cannot access a property or method of a null object reference.
    at fl.containers::ScrollPane/setScrollDrag()
    at fl.containers::ScrollPane/draw()
    at fl.core::UIComponent/drawNow()
    at fl.containers::BaseScrollPane/set horizontalScrollPosition()
    at Program()
    at Preloader/main()
    at Preloader/enterFrameHandler()
偶数scrollPane.horizontalScrollPosition=scrollPane.horizontalScrollPosition；抛出相同的错误

但是跟踪（滚动窗格。水平滚动位置）；很好用

我也尝试过hPosition，但它根本不起作用。任何关于我如何控制滚动位置的线索都将不胜感激

下面是完整的代码

package {
    import flash.display.*;
    import flash.events.*;
    import flash.filters.*;
    import fl.transitions.Tween;
    import fl.transitions.easing.*;
    import fl.containers.ScrollPane;


    public class Program extends Sprite {
        public function Program() {
            //define variable
            var startX:Number;
            var startY:Number;
            var counter:Number = 0;
            const LIMIT:Number = 100;
            var intMessages:Number = 80;
            var intBoardSize:Number = 476*(Math.round(intMessages/15)+1);
            var intMessageMinX:Number = 35;
            var intMessageMaxX:Number = intBoardSize-99;
            var intMessageMinY:Number = 35;
            var intMessageMaxY:Number = 310;
            var activeGloveName:String = ""
            var intDegreeHigh:Number = 45;
            var intDegreeLow:Number = -45;

            //create objects
            var mcglove:mcGlove = new mcGlove();
            var mcglovetarget:mcGloveTarget = new mcGloveTarget();
            var myDropShadowFilterSmall = new DropShadowFilter (2,45,0x000000,0.65,3,3,2,3,false,false,false);
            var myDropShadowFilterDown = new DropShadowFilter (3,45,0x000000,0.65,5,5,2,3,false,false,false);
            var myDropShadowFilterUp = new DropShadowFilter (5,45,0x000000,0.65,7,7,2,3,false,false,false);
            var topShadow = new DropShadowFilter (3,90,0x000000,0.35,8,8,2,3,false,false,false);
            var holder:MovieClip = new MovieClip();
            var pinkline:Sprite = new Sprite();
            var searchBox:Sprite = new Sprite();
            var topShadowBox:Sprite = new Sprite();
            var aMessages:Array = new Array();


            //Create a glove for each message
            for (var x = 0; x < intMessages; x++){
                aMessages[x] = new mcGlove();
                aMessages[x].scaleX = .28;
                aMessages[x].scaleY = .28;
                counter = 0;
                position(aMessages[x]);
                aMessages[x].rotation = (0, 0, 0, Math.round(Math.random() * (intDegreeHigh - intDegreeLow)) + intDegreeLow);
                aMessages[x].filters = [myDropShadowFilterSmall];
                holder.addChild(aMessages[x]);
                aMessages[x].name = "glove" + x;
                aMessages[x].addEventListener(MouseEvent.MOUSE_DOWN, selectMessage);
                aMessages[x].addEventListener(MouseEvent.MOUSE_UP, releaseMessage);
                aMessages[x].buttonMode = true;
            }

            var scrollPane:ScrollPane = new ScrollPane();
            scrollPane.verticalScrollPolicy = "false";
            scrollPane.move(374, 0);
            scrollPane.setSize(476, 370);
            scrollPane.horizontalLineScrollSize = 120;


            topShadowBox.graphics.beginFill(0x333333);
            topShadowBox.graphics.drawRect(0,0,870,5);
            topShadowBox.x = -10;
            topShadowBox.y = -5;
            topShadowBox.filters = [topShadow];

            pinkline.graphics.beginFill(0xDB9195);
            pinkline.graphics.drawRect(0,0,476,2);
            pinkline.x = 374;
            pinkline.y = 353;

            searchBox.graphics.beginFill(0xDB9195);
            searchBox.graphics.drawRect(0,0,476,25);
            searchBox.x = 374;
            searchBox.y = 370;

            //add to frame
            sortObjects();

            scrollPane.source = holder;

            scrollPane.horizontalScrollPosition = 5;

            //create instance names for referancing/compairing objects
            mcglove.name = "mcglove";
            mcglovetarget.name = "mcglovetarget";

            //position the glove and modify apperiance
            mcglove.x = 163;
            mcglove.y = 211;
            mcglove.filters = [myDropShadowFilterDown];
            mcglovetarget.x = 615;
            mcglovetarget.y = 211;
            mcglovetarget.alpha = 0

            //action listeners
            mcglove.addEventListener(MouseEvent.MOUSE_DOWN, selectGlove);
            mcglove.addEventListener(MouseEvent.MOUSE_UP, releaseGlove);

            function position(target) {
                target.x = Math.round(Math.random() * (intMessageMaxX - intMessageMinX)) + intMessageMinX;
                target.y = Math.round(Math.random() * (intMessageMaxY - intMessageMinY)) + intMessageMinY;
                for (var i:uint=0; i<aMessages.length -1 ; i++) {
                    if(target.hitTestObject(aMessages[i]) && counter < LIMIT){
                        counter++;
                        position(target);
                        return false;
                    };
                }
            } 

            function selectGlove(event:MouseEvent):void {
                event.target.startDrag(true);
                var myTargetName:String = event.target.name + "target";
                var myTarget:DisplayObject = getChildByName(myTargetName);
                mcglove.filters = [myDropShadowFilterUp];
                addChild(myTarget);
                event.target.parent.addChild(event.target);
                addChild(topShadowBox);
                myTarget.alpha = .5;
                startX = event.target.x;
                startY = event.target.y;
            }

            function releaseGlove(event:MouseEvent):void {
                event.target.stopDrag();
                var myTargetName:String = event.target.name + "target";
                var myTarget:DisplayObject = getChildByName(myTargetName);
                event.target.filters = [myDropShadowFilterDown];
                myTarget.alpha = 0;

                if (event.target.dropTarget != null && event.target.dropTarget.parent == myTarget){
                    event.target.removeEventListener(MouseEvent.MOUSE_DOWN, selectGlove);
                    event.target.removeEventListener(MouseEvent.MOUSE_UP, releaseGlove);
                    event.target.x = myTarget.x;
                    event.target.y = myTarget.y;
                    var myTween:Tween = new Tween(getChildByName(event.target.name), "scaleX",Strong.easeOut,getChildByName(event.target.name).scaleX,.28,2,true);
                    var myTween2:Tween = new Tween(getChildByName(event.target.name), "scaleY",Strong.easeOut,getChildByName(event.target.name).scaleY,.28,2,true);
                    holder.addChild(getChildByName(event.target.name));
                    scrollPane.source = holder;
                    holder.getChildByName(event.target.name).x=Math.round(Math.random() * (470+Math.round(scrollPane.horizontalScrollPosition) - Math.round(scrollPane.horizontalScrollPosition))) + Math.round(scrollPane.horizontalScrollPosition);
                    holder.getChildByName(event.target.name).y=Math.round(Math.random() * (intMessageMaxY - intMessageMinY)) + intMessageMinY;
                    holder.getChildByName(event.target.name).addEventListener(MouseEvent.MOUSE_DOWN, selectMessage);
                    holder.getChildByName(event.target.name).addEventListener(MouseEvent.MOUSE_UP, releaseMessage);
                } else {
                    event.target.x = startX;
                    event.target.y = startY;
                }

                //sortObjects();
                addChild(scrollPane);
                addChild(pinkline);
                addChild(topShadowBox);
            }

            function selectMessage(event:MouseEvent):void{
                if (activeGloveName != ""){
                    var activeGlove:DisplayObject = holder.getChildByName(activeGloveName);
                    activeGlove.filters = [myDropShadowFilterSmall];
                    activeGlove.scaleX = .28;
                    activeGlove.scaleY = .28;


                holder.addChild(activeGlove);
                }
                activeGloveName = event.target.name;
                //event.target.dragIt();
                holder.addChild(holder.getChildByName(event.target.name));
                event.target.filters = [new GlowFilter(0xABEEFC, .65, 15, 15, 1, 1, false, false)];
                event.target.scaleX = .35;
                event.target.scaleY = .35;
            }

            function releaseMessage(event:MouseEvent):void{
                event.target.dropIt();
            }

            function sortObjects():void{
                addChild(mcglovetarget);
                addChild(scrollPane);
                addChild(pinkline);
                addChild(searchBox);
                addChild(mcglove);
                addChild(topShadowBox);
            }

            mcglove.buttonMode = true;

        }
    }
}

包{
导入flash.display.*；
导入flash.events.*；
进口闪光滤光片。*；
导入fl.transitions.Tween；
导入fl.transitions.easing.*；
导入fl.containers.ScrollPane；
公共类程序扩展了Sprite{
公共职能计划（）{
//定义变量
var startX：编号；
var startY：数字；
变量计数器：数值=0；
常数限值：数量=100；
var intMessages:Number=80；
变量intBoardSize:Number=476*（数学舍入（intMessages/15）+1）；
var intMessageMinX:Number=35；
var intMessageMaxX:Number=intBoardSize-99；
var intMessageMinY:Number=35；
var intMessageMaxY:Number=310；
var activeGloveName:String=“”
var intDegreeHigh：数字=45；
变量intDegreeLow:Number=-45；
//创建对象
var mcglove:mcglove=new mcglove（）；
var mcglovetarge:mcglovetarge=new mcglovetarge（）；
var myDropShadowFilterSmall=新的DropShadowFilter（2,45,0x000000,0.65,3,3,2,3，false，false）；
var myDropShadowFilterDown=新的DropShadowFilter（3,45,0x000000,0.65,5,5,2,3，false，false，false）；
var myDropShadowFilterUp=新的DropShadowFilter（5,45,0x000000,0.65,7,7,2,3，false，false，false）；
var topShadow=新的DropShadowFilter（3,90,0x000000,0.35,8,8,2,3，假，假，假）；
var支架：MovieClip=新的MovieClip（）；
var pinkline:Sprite=新Sprite（）；
var searchBox:Sprite=newsprite（）；
var topShadowBox:Sprite=新Sprite（）；
var aMessages:Array=new Array（）；
//为每条消息创建一个手套
对于（var x=0；xfor（var i:uint=0；ihorizontalScrollPosition是ScrollPane的一个属性，因此您可以设置它

scrollPane.horizontalScrollPosition=500


而不是方法调用。
horizontalScrollPosition是ScrollPane的一个属性，因此您可以设置它

scrollPane.horizontalScrollPosition=500


而不是方法调用。
如果查看错误跟踪，则错误发生在

fl.containers::ScrollPane/setScrollDrag().
fl.containers:：ScrollPane/setScrollDrag（）。
如果你仔细看，你会发现滚动拖动

获取或设置一个值，该值指示当用户拖动滚动窗格中的内容时是否发生滚动

您从未将内容放入滚动窗格



scrollPane.source=“…”；



我相信这就是发生错误的原因，在设置horizontalScrollPosition之前，请尝试将一些内容放入scrollpane。
如果查看错误跟踪，则错误发生在

fl.containers::ScrollPane/setScrollDrag().
佛罗里达州集装箱：

this.addChild(sp)
sp.verticalScrollPosition = 0;