我有四个选择题（包含文本字段的精灵），我最初设置为不可见。单击一个按钮时，我将它们显示为可见，然后我希望它们渐变为alpha 0，只剩下正确的答案。以下代码实现了这一点 - 但只有当我在addedToStage处理程序上调用initTweens（）时才会这样做。如果我尝试从按钮单击事件 - playClickHandler调用它 - 不会发生alpha淡入淡出。谁能明白为什么？
感谢。
package
{
import com.greensock.TimelineLite;
import com.greensock.TweenLite;
import com.greensock.easing.*;
import flash.display.Bitmap;
import flash.display.GradientType;
import flash.display.Graphics;
import flash.display.Shape;
import flash.display.Sprite;
import flash.events.Event;
import flash.events.MouseEvent;
import flash.geom.Matrix;
import flash.net.URLRequest;
import flash.net.navigateToURL;
import flash.text.TextField;
import flash.text.TextFieldAutoSize;
import flash.text.TextFieldType;
import flash.text.TextFormat;
import views.Icons;
[SWF(width="400", height="350", backgroundColor="0xffffff")]
public class game extends Sprite
{
//sprites
private var container:Sprite;
private var question:Sprite = new Sprite();
private var answer1:Sprite = new Sprite();
private var answer2:Sprite = new Sprite();
private var answer3:Sprite = new Sprite();
private var answer4:Sprite = new Sprite();
private var explanation:Sprite = new Sprite();
private var playButton:Sprite;
//text fields
private var txtQuestion:TextField = new TextField();
private var txtAnswer1:TextField = new TextField();
private var txtAnswer2:TextField = new TextField();
private var txtAnswer3:TextField = new TextField();
private var txtAnswer4:TextField = new TextField();
private var txtExplanation:TextField = new TextField();
private var vBuffer:Number = 10;
//strings for textfields
private var currentQuestion:String;
private var currentAnswer1:String;
private var currentAnswer2:String;
private var currentAnswer3:String;
private var currentAnswer4:String;
private var currentExplanation:String;
private var questionSets:Array = [];
private var timeline:TimelineLite = new TimelineLite();
private var fadeSpeed:Number = 3;
private var bmpplayButton:Bitmap;
private var centeredAnswerPosition:Number;
//create a keyword which will trigger the presentation of a given questionSet
private var keyWord:String;
private var questionObj:Object;
private var textWidth:Number = 400;
private var textHeight:Number;
public function game()
{
this.addEventListener(Event.ADDED_TO_STAGE, addedToStageHandler);
}
private function addedToStageHandler(e:Event):void
{
bmpplayButton = new Icons.PlayButtonMedium();
loadData("amzn");
setUpQuestion();
//initTweens(); //this works
}
private function playClickHandler(e:MouseEvent):void
{
makeVisible();
initTweens(); //code runs, but this doesn't work -- the alpha changes don't happen.
}
private function makeVisible():void
{
answer1.visible = true;
answer2.visible = true;
answer3.visible = true;
answer4.visible = true;
explanation.visible = true;
}
private function initTweens():void
{
timeline.insert(TweenLite.to(answer1,fadeSpeed, {autoAlpha:0, delay:4}),0);
timeline.insert(TweenLite.to(answer3,fadeSpeed, {autoAlpha:0, delay:7}),0);
timeline.insert(TweenLite.to(answer4,fadeSpeed, {autoAlpha:0, delay:10}),0);
timeline.insert(TweenLite.to(answer2, 2, {x:100,scaleX:2, scaleY:2, delay: 12}),0);
timeline.insert(TweenLite.to(explanation, fadeSpeed, {autoAlpha:1, delay:14}),0);
timeline.append(TweenLite.delayedCall(3, clear));
}
private function setUpQuestion():void
{
container = new Sprite();
container.name = "container";
container.buttonMode = true;
container.useHandCursor = true;
addChild(container);
txtQuestion.name = "txtQuestion";
txtQuestion.width = textWidth;
txtQuestion.wordWrap = true;
txtQuestion.multiline = true;
txtQuestion.type = TextFieldType.DYNAMIC;
txtQuestion.autoSize = TextFieldAutoSize.LEFT;
question.addChild(txtQuestion);
var textFormat:TextFormat = new TextFormat("Arial", 14, 0x000000, false, false, false, "", "", "left", 0, 0, 0, 0);
txtQuestion.setTextFormat(textFormat);
txtQuestion.defaultTextFormat = textFormat;
txtQuestion.text = currentQuestion;
answer1.y = question.y + question.height + vBuffer;
txtAnswer1.width = textWidth;
txtAnswer1.wordWrap = true;
txtAnswer1.multiline = true;
txtAnswer1.type = TextFieldType.DYNAMIC;
txtAnswer1.autoSize = TextFieldAutoSize.LEFT;
txtAnswer1.setTextFormat(textFormat);
txtAnswer1.defaultTextFormat = textFormat;
txtAnswer1.text = currentAnswer1;
answer1.addChild(txtAnswer1);
answer1.visible = false;
answer2.y = answer1.y + answer1.height + vBuffer
txtAnswer2.width = textWidth;
txtAnswer2.wordWrap = true;
txtAnswer2.multiline = true;
txtAnswer2.type = TextFieldType.DYNAMIC;
txtAnswer2.autoSize = TextFieldAutoSize.LEFT;
txtAnswer2.setTextFormat(textFormat);
txtAnswer2.defaultTextFormat = textFormat;
txtAnswer2.text = currentAnswer2;
answer2.addChild(txtAnswer2);
centeredAnswerPosition = stage.stageWidth/2 - answer2.width/2;
answer2.visible = false;
answer3.y = answer2.y + answer2.height + vBuffer;
txtAnswer3.width = textWidth;
txtAnswer3.wordWrap = true;
txtAnswer3.multiline = true;
txtAnswer3.type = TextFieldType.DYNAMIC;
txtAnswer3.autoSize = TextFieldAutoSize.LEFT;
txtAnswer3.setTextFormat(textFormat);
txtAnswer3.defaultTextFormat = textFormat;
txtAnswer3.text = currentAnswer3;
answer3.addChild(txtAnswer3);
answer3.visible = false;
answer4.y = answer3.y + answer3.height + vBuffer;
txtAnswer4.width = textWidth;
txtAnswer4.wordWrap = true;
txtAnswer4.multiline = true;
txtAnswer4.type = TextFieldType.DYNAMIC;
txtAnswer4.autoSize = TextFieldAutoSize.LEFT;
txtAnswer4.setTextFormat(textFormat);
txtAnswer4.defaultTextFormat = textFormat;
txtAnswer4.text = currentAnswer4;
answer4.addChild(txtAnswer4);
answer4.visible = false;
explanation.y = answer4.y + answer4.height + vBuffer;
explanation.alpha = 0; //hide it
txtExplanation.width = textWidth;
txtExplanation.wordWrap = true;
txtExplanation.multiline = true;
txtExplanation.type = TextFieldType.DYNAMIC;
txtExplanation.autoSize = TextFieldAutoSize.LEFT;
txtExplanation.y = txtAnswer4.y + txtAnswer1.height + vBuffer;
txtExplanation.setTextFormat(textFormat);
txtExplanation.defaultTextFormat = textFormat;
txtExplanation.text = currentExplanation;
explanation.addChild(txtExplanation);
explanation.visible = false;
playButton = new Sprite();
playButton.name = "play";
playButton.buttonMode = true;
playButton.useHandCursor = true;
playButton.addChild(bmpplayButton);
playButton.x = stage.stageWidth/2 - playButton.width/2;
playButton.y = explanation.y + explanation.height + 5*vBuffer;
playButton.addEventListener(MouseEvent.CLICK, playClickHandler);
container.addChild(question);
container.addChild(answer1);
container.addChild(answer2);
container.addChild(answer3);
container.addChild(answer4);
container.addChild(explanation);
container.addChild(playButton);
}
private function loadData(questionSet:String):void
{
switch(questionSet)
{
case "cap":
currentQuestion = "What is the term for the number of a company's shares currently available for trading?";
currentAnswer1 = "The Cap" ;
currentAnswer2 = "The Float";
currentAnswer3 = "The Book";
currentAnswer4 = "The Major Leagues";
currentExplanation = "If a large percentage of the float is 'short' then it can set up a short squeeze.";
break;
case "amzn":
currentQuestion = "How much has Amazon gone up in the last 10 years?";
currentAnswer1 = "100%" ;
currentAnswer2 = "10000%";
currentAnswer3 = "1000%";
currentAnswer4 = "400%";
currentExplanation = "Yes, it's gone up a hundredfold. Buy and hold!";
break;
}
}
private function clear():void
{
question.visible = false;
answer1.visible = false;
answer2.visible = false;
answer3.visible = false;
answer4.visible = false;
explanation.visible = false;
}
}
}
答案 0 :(得分：0)
问题出在您makeVisible()调用的playClickHandler(e:MouseEvent)。如果您评论或删除该行，则其行为应与ADDED_TO_STAGE事件相同。
原因是AutoAlpha插件控制了您的可见性，因此您不需要调用makeVisible()。
来源：http://www.greensock.com/as/docs/tween/com/greensock/plugins/AutoAlphaPlugin.html
答案 1 :(得分：-1)
我想出了一个解决方案。
而不是在声明时实例化：
private var timeline:TimelineLite = new TimelineLite();
我刚刚做了
private var timeline:TimelineLite;
然后我在initTweens（）函数中实例化它。这就是诀窍。出于某种原因，时间线是自动运行的，只是因为它在声明时被实例化，无论它被调用的地方。