我是闪存新手，所以这个问题的解决方案可能很简单。不幸的是我一直无法找到有效的解决方案，所以我希望你们能提供帮助。我正在使用第 3 方 Flash - Coverflow 为专辑开发一个网站。它看起来很棒，您可以在这里下载:http://www.weberdesignlabs.com/blog/2009/12/flash-10-coverflow/ 。我的挑战是我想通过 HTML 中的 Javascript 调用来处理专辑。在我的搜索中，我发现了ExternalInterface，但我无法让它工作。当我尝试导出影片时，出现“访问未定义的属性 gotoCoverFlowItem”错误。
下面是我试图修改的 Coverflow.ai 文件中包含的代码，以及其中的修改。完整的代码可以在上面的链接中找到。我使用的是Flash 10版本。
////////////////////////////////////////////
// Project: Flash 10 Coverflow
// Date: 10/3/09
// Author: Stephen Weber
////////////////////////////////////////////
package {
////////////////////////////////////////////
// IMPORTS
////////////////////////////////////////////
import flash.display.Sprite;
import flash.display.BitmapData;
import flash.display.Bitmap;
import flash.display.GradientType;
import flash.display.Graphics;
import flash.display.Shape;
import flash.display.MovieClip;
import flash.display.BlendMode;
import flash.display.Loader;
import flash.events.Event;
import flash.events.KeyboardEvent;
import flash.events.MouseEvent;
import flash.events.IOErrorEvent;
import flash.geom.Matrix;
import flash.geom.Rectangle;
import flash.geom.ColorTransform;
import flash.net.URLRequest;
import flash.net.URLLoader;
import flash.net.navigateToURL;
import flash.display.Stage;
import flash.utils.setTimeout;
import flash.external.ExternalInterface;
//TweenLite - Tweening Engine - SOURCE: http://blog.greensock.com/tweenliteas3/
import com.greensock.*;
import com.greensock.easing.*;
import com.greensock.plugins.*;
public class Coverflow extends Sprite {
////////////////////////////////////////////
// VARIABLES
////////////////////////////////////////////
// size of the stage
private var sw:Number;
private var sh:Number;
private var background:Background;
// padding between each cover, can be customed via xml
private var coverflowSpacing:Number=30;
// transition time for movement
private var transitionTime:Number=0.75;
// the center of the stage
private var centerX:Number;
private var centerY:Number;
// store each image cover's instance
private var coverArray:Array=new Array();
// title of each image
private var coverLabel:CoverflowTitle = new CoverflowTitle();
// the slider under the image cover
private var coverSlider:Scrollbar;
// how many image covers
private var coverflowItemsTotal:Number;
// how to open the link
private var _target:String;
// size of the image cover
private var coverflowImageWidth:Number;
private var coverflowImageHeight:Number;
//Holds the objects in the data array
private var _data:Array = new Array();
// the y position of the item's title
private var coverLabelPositionY:Number;
//Z Position of Current CoverflowItem
private var centerCoverflowZPosition:Number=-125;
// display the middle of the cover or not
private var startIndexInCenter:Boolean=true;
// which cover to display in the beginning
private var startIndex:Number=0;
// the slide's Y position
private var coverSlidePositionY:Number;
//Holder for current CoverflowItem
private var _currentCover:Number;
//CoverflowItem Container
private var coverflowItemContainer:Sprite = new Sprite();
//XML Loading
private var coverflowXMLLoader:URLLoader;
//XML
private var coverflowXML:XML;
// the image cover's white border padding
private var padding:Number=4;
// stage reference
private var _stage:Stage;
//reflection
private var reflection:Reflect;
//Reflection Properties
private var reflectionAlpha:Number;
private var reflectionRatio:Number;
private var reflectionDistance:Number;
private var reflectionUpdateTime:Number;
private var reflectionDropoff:Number;
////////////////////////////////////////////
// CONSTRUCTOR - INITIAL ACTIONS
////////////////////////////////////////////
public function Coverflow(_width:Number, _height:Number, __stage:Stage = null):void {
_stage=__stage;
sw=_width;
sh=_height;
centerX=_width>>1;
centerY=(_height>>1) - 20;
loadXML();
//Grabs Background color passed in through FlashVars
var backgColor:String = _stage.loaderInfo.parameters["backgroundColor"];
if(backgColor == null) {
//Black
backgColor = "0x000000";
//White
//backgColor = "0xFFFFFF";
}
//Creates Background MovieClip
background = new Background();
//Set Background To Provided Width/Height
background.width = _width;
background.height = _height;
//Adds background MovieClip to DisplayList
addChild(background);
//Tints Background MovieClip with provided tint
TweenPlugin.activate([TintPlugin]);
TweenLite.to(background, 0, {tint:backgColor});
//Grabs Background color passed in through FlashVars
var labelColor:String = _stage.loaderInfo.parameters["labelColor"];
//Check for value and then default
if(labelColor == null) {
//Black
//labelColor = "0x000000";
//White
labelColor = "0xFFFFFF";
}
//Tint Coverflow label to color provided
TweenLite.to(coverLabel, 0, {tint:labelColor});
if (_stage) {
_stage.addEventListener(KeyboardEvent.KEY_DOWN, keyDownHandler);
}
}
////////////////////////////////////////////
// FUNCTIONS
////////////////////////////////////////////
private function keyDownHandler(e:KeyboardEvent):void {
if (e.keyCode==37||e.keyCode==74) {
clickPre();
}
if (e.keyCode==39||e.keyCode==75) {
clickNext();
}
// 72 stand for "H" key, 191 stand for "?" key
if (e.keyCode==72||e.keyCode==191) {
}
}
// display the previous image
private function clickPre(e:Event=null):void {
_currentCover--;
if (_currentCover<0) {
_currentCover=coverflowItemsTotal-1;
}
coverSlider.value=_currentCover;
gotoCoverflowItem(_currentCover);
}
// display the next image
private function clickNext(e:Event=null):void {
_currentCover++;
if (_currentCover>coverflowItemsTotal-1) {
_currentCover=0;
}
coverSlider.value=_currentCover;
gotoCoverflowItem(_currentCover);
}
// loading the XML
private function loadXML():void {
//Loads XML passed through FlashVars
var xml_source:String = _stage.loaderInfo.parameters["xmlPath"];
//If XML not found through FlashVars then defaults to xml path below
if(xml_source == null) {
xml_source = 'xml/data.xml';
}
// loading the cover xml here
coverflowXMLLoader = new URLLoader();
coverflowXMLLoader.load(new URLRequest("xml/data.xml"));
coverflowXMLLoader.addEventListener(Event.COMPLETE, coverflowXMLLoader_Complete);
coverflowXMLLoader.addEventListener(IOErrorEvent.IO_ERROR, coverflowXMLLoader_IOError);
}
// parse the XML
private function coverflowXMLLoader_Complete(e:Event):void {
coverflowXML=new XML(e.target.data);
coverflowItemsTotal=coverflowXML.cover.length();
coverflowSpacing=Number(coverflowXML.@coverflowSpacing);
coverflowImageWidth=Number(coverflowXML.@imageWidth);
coverflowImageHeight=Number(coverflowXML.@imageHeight);
coverLabelPositionY=Number(coverflowXML.@coverLabelPositionY);
coverSlidePositionY=Number(coverflowXML.@coverSlidePositionY);
transitionTime=Number(coverflowXML.@transitionTime);
centerCoverflowZPosition=Number(coverflowXML.@centerCoverflowZPosition);
//Image Border
padding = Number(coverflowXML.@imagePadding)
//Reflection Attributes
reflectionAlpha=Number(coverflowXML.@reflectionAlpha);
reflectionRatio=Number(coverflowXML.@reflectionRatio);
reflectionDistance=Number(coverflowXML.@reflectionDistance);
reflectionUpdateTime=Number(coverflowXML.@reflectionUpdateTime);
reflectionDropoff=Number(coverflowXML.@reflectionDropoff);
startIndex=Number(coverflowXML.@startIndex);
startIndexInCenter = (coverflowXML.@startIndexInCenter.toLowerCase().toString()=="yes");
_target=coverflowXML.@target.toString();
for (var i=0; i<coverflowItemsTotal; i++) {
//Make An Object To Hold Values
var _obj:Object = new Object();
//Set Values To Object from XML for each CoverflowItem
_obj.image = (coverflowXML.cover[i].@img.toString());
_obj.title = (coverflowXML.cover[i].@title.toString());
_obj.link = (coverflowXML.cover[i].@link.toString());
_data[i] = _obj;
}
loadCover();
}
private function coverflowXMLLoader_IOError(event:IOErrorEvent):void {
trace("Coverflow XML Load Error: "+ event);
}
// load the image cover when xml is loaded
private function loadCover():void {
for (var i:int = 0; i < coverflowItemsTotal; i++) {
var cover:Sprite=createCover(i,_data[i].image);
coverArray[i]=cover;
cover.y=centerY;
cover.z=0;
coverflowItemContainer.addChild(cover);
}
if (startIndexInCenter) {
startIndex=coverArray.length>>1;
gotoCoverflowItem(startIndex);
} else {
gotoCoverflowItem(startIndex);
}
_currentCover=startIndex;
coverSlider=new Scrollbar(coverflowItemsTotal,_stage);
coverSlider.value=startIndex;
coverSlider.x = (_stage.stageWidth/2) - (coverSlider.width/2);
coverSlider.y=_stage.stageHeight-40;
coverSlider.addEventListener("UPDATE", coverSlider_Update);
coverSlider.addEventListener("PREVIOUS", coverSlider_Previous);
coverSlider.addEventListener("NEXT", coverSlider_Next);
addChild(coverSlider);
//coverLabel.x = (sw - coverLabel.width)>>1;
coverLabel.x = (_stage.stageWidth/2) - (coverLabel.width/2);
coverLabel.y=coverLabelPositionY;
addChild(coverLabel);
addChild(coverSlider);
addChild(coverLabel);
}
private function coverSlider_Update(e:Event):void {
var value:Number=(coverSlider.value);
gotoCoverflowItem(value);
e.stopPropagation();
}
private function coverSlider_Previous(e:Event):void {
clickPre();
}
private function coverSlider_Next(e:Event):void {
clickNext();
}
// move to a certain cover via number
private function gotoCoverflowItem(n:int):void {
_currentCover=n;
reOrderCover(n);
if (coverSlider) {
coverSlider.value=n;
}
}
ExternalInterface.addCallback("gotoCover", gotoCoverflowItem);
private function cover_Selected(event:CoverflowItemEvent):void {
var currentCover:uint=event.data.id;
if (coverArray[currentCover].rotationY==0) {
try {
// open the link if user click the cover in the middle again
if (_data[currentCover].link!="") {
navigateToURL(new URLRequest(_data[currentCover].link), _target);
}
} catch (e:Error) {
//
}
} else {
gotoCoverflowItem(currentCover);
}
}
// change each cover's position and rotation
private function reOrderCover(currentCover:uint):void {
for (var i:uint = 0, len:uint = coverArray.length; i < len; i++) {
var cover:Sprite=coverArray[i];
if (i<currentCover) {
//Left Side
TweenLite.to(cover, transitionTime, {x:(centerX - (currentCover - i) * coverflowSpacing - coverflowImageWidth/2), z:(coverflowImageWidth/2), rotationY:-65});
} else if (i > currentCover) {
//Right Side
TweenLite.to(cover, transitionTime, {x:(centerX + (i - currentCover) * coverflowSpacing + coverflowImageWidth/2), z:(coverflowImageWidth/2), rotationY:65});
} else {
//Center Coverflow
TweenLite.to(cover, transitionTime, {x:centerX, z:centerCoverflowZPosition, rotationY:0});
//Label Handling
coverLabel._text.text=_data[i].title;
coverLabel.alpha=0;
TweenLite.to(coverLabel, 0.75, {alpha:1,delay:0.2});
}
}
for (i = 0; i < currentCover; i++) {
addChild(coverArray[i]);
}
for (i = coverArray.length - 1; i > currentCover; i--) {
addChild(coverArray[i]);
}
addChild(coverArray[currentCover]);
if (coverSlider) {
addChild(coverSlider);
addChild(coverLabel);
}
}
//Create CoverflowItem and Set Data To It
private function createCover(num:uint, url:String):Sprite {
//Setup Data
var _data:Object = new Object();
_data.id=num;
//Create CoverflowItem
var cover:CoverflowItem=new CoverflowItem(_data);
//Listen for Click
cover.addEventListener(CoverflowItemEvent.COVERFLOWITEM_SELECTED, cover_Selected);
//Set Some Values
cover.name=num.toString();
cover.image=url;
cover.padding=padding;
cover.imageWidth=coverflowImageWidth;
cover.imageHeight=coverflowImageHeight;
cover.setReflection(reflectionAlpha, reflectionRatio, reflectionDistance, reflectionUpdateTime, reflectionDropoff);
//Put CoverflowItem in Sprite Container
var coverItem:Sprite = new Sprite();
cover.x=- coverflowImageWidth/2-padding;
cover.y=- coverflowImageHeight/2-padding;
coverItem.addChild(cover);
coverItem.name=num.toString();
return coverItem;
}
}
}
我添加的代码是:
ExternalInterface.addCallback("gotoCover", gotoCoverflowItem);
请帮忙!
最佳答案
将ExternalInterface 调用放在Coverflow 构造函数的末尾应该可以按需要工作。您当前的行不在函数内。
我不知道您的 JavaScript 是什么样的，但此代码需要 gotoCoverflowItem 的参数，因此我假设您正在传递适当的数据。
我还没有浏览完所有代码，但请记住，当前代码可能会执行某些操作 - 如果您仅向其提供下一个封面的索引，则可能无法完成这些操作。我确实在 gotoColorflowItem 函数中看到了根据选择更新 slider 和当前封面的变量的代码，因此可能没问题。
此外，如果您出于任何原因尝试在浏览器之外进行测试，则很可能会遇到运行时错误，因此您可能需要针对这种情况进行 try/catch。
作者在页面上包含了他的智慧:
“注意:我不建议尝试使用此文件学习 Flash。有很多人询问如何更改文本颜色，如果您有这些请求，我建议您浏览一些 Lynda.com Flash 教程来获取您熟悉 Flash 或聘请 Flash 开发人员来帮助您。”
关于javascript - 使用ExternalInterface访问Flash中的未定义属性错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/6180009/