ActionScript 3 使用XML创建AS3幻灯片
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// import tweener
import caurina.transitions.Tweener;
// delay between slides
const TIMER_DELAY:int = 5000;
// fade time between slides
const FADE_TIME:int = 1;
// reference to the current slider container
var currentContainer:Sprite;
// index of the current slide
var intCurrentSlide:int = -1;
// total slides
var intSlideCount:int;
// timer for switching slides
var slideTimer:Timer;
// slides holder
var sprContainer1:Sprite;
var sprContainer2:Sprite;
// slides loader
var slideLoader:Loader;
// url to slideshow xml
var strXMLPath:String = "slideshow-data.xml";
// slideshow xml loader
var xmlLoader:URLLoader;
// slideshow xml
var xmlSlideshow:XML;
function init():void {
// create new urlloader for xml file
xmlLoader = new URLLoader();
// add listener for complete event
xmlLoader.addEventListener(Event.COMPLETE, onXMLLoadComplete);
// load xml file
xmlLoader.load(new URLRequest(strXMLPath));
// create new timer with delay from constant
slideTimer = new Timer(TIMER_DELAY);
// add event listener for timer event
slideTimer.addEventListener(TimerEvent.TIMER, switchSlide);
// create 2 container sprite which will hold the slides and
// add them to the masked movieclip
sprContainer1 = new Sprite();
sprContainer2 = new Sprite();
mcSlideHolder.addChild(sprContainer1);
mcSlideHolder.addChild(sprContainer2);
// keep a reference of the container which is currently
// in the front
currentContainer = sprContainer2;
}
function onXMLLoadComplete(e:Event):void {
// create new xml with the received data
xmlSlideshow = new XML(e.target.data);
// get total slide count
intSlideCount = xmlSlideshow..image.length();
// switch the first slide without a delay
switchSlide(null);
}
function fadeSlideIn(e:Event):void {
// add loaded slide from slide loader to the
// current container
currentContainer.addChild(slideLoader.content);
// clear preloader text
mcInfo.lbl_loading.text = "";
// fade the current container in and start the slide timer
// when the tween is finished
Tweener.addTween(currentContainer, {alpha:1, time:FADE_TIME, onComplete:function() { slideTimer.start(); }});
}
function switchSlide(e:Event):void {
// check, if the timer is running (needed for the
// very first switch of the slide)
if(slideTimer.running)
slideTimer.stop();
// check if we have any slides left and increment
// current slide index
if(intCurrentSlide + 1 < intSlideCount)
intCurrentSlide++;
// if not, start slideshow from beginning
else
intCurrentSlide = 0;
// check which container is currently in the front and
// assign currentContainer to the one that's in the back with
// the old slide
if(currentContainer == sprContainer2)
currentContainer = sprContainer1;
else
currentContainer = sprContainer2;
// hide the old slide
currentContainer.alpha = 0;
// bring the old slide to the front
mcSlideHolder.swapChildren(sprContainer2, sprContainer1);
// create a new loader for the slide
slideLoader = new Loader();
// add event listener when slide is loaded
slideLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, fadeSlideIn);
// add event listener for the progress
slideLoader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, showProgress);
// load the next slide
slideLoader.load(new URLRequest(xmlSlideshow..image[intCurrentSlide].@src));
// show description of the next slide
mcInfo.lbl_description.text = xmlSlideshow..image[intCurrentSlide].@desc;
// show current slide and total slides
mcInfo.lbl_count.text = (intCurrentSlide + 1) + †/ †+ intSlideCount + †Slidesâ€;
}
function showProgress(e:ProgressEvent):void {
// show percentage of the bytes loaded from the current slide
mcInfo.lbl_loading.text = “Loading…†+ Math.ceil(e.bytesLoaded * 100 / e.bytesTotal) + “%â€;
}
// init slideshow
init();
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