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How to check if Image is preloaded
hi to all,
i´ve written a small class for a image galery with preloader. but how to check if a image allready is loaded to hide preloader bar?
i tried to discover with httpStatus, but unfortunetly this event is dispatched after the open/progress event - maybe someone can give me an hint
the code comes here
main class:
Code:
package marek {
import flash.display.*;
import flash.net.*
import flash.events.*;
import flash.utils.*;
import flash.filters.BlurFilter;
import com.greensock.*;
import com.greensock.easing.*;
public class main extends Sprite {
private var xmlCnt:XML;
private var imgLst:XMLList;
private var urlLdr:URLLoader;
private var bmp:Bitmap;
private var imgHolder:MovieClip;
private var loader:Loader;
private var mainTimer:Timer;
private var imgBlurFilter:BlurFilter;
private var loaderbar:LoaderBar;
private var imgTween:TweenMax;
public function main() {
stage.scaleMode = StageScaleMode.NO_SCALE;
stage.align = StageAlign.TOP_LEFT;
XMLLoader();
}
private function XMLLoader():void {
XML.ignoreComments = true;
XML.ignoreWhitespace = true;
urlLdr = new URLLoader();
urlLdr.addEventListener(Event.COMPLETE, completeListenerXML);
urlLdr.load(new URLRequest("main.xml"));
}
private function completeListenerXML(e:Event):void {
xmlCnt = new XML(urlLdr.data);
imgLst = xmlCnt.galery.item;
init();
}
private function init():void {
imgHolder = new MovieClip();
addChild(imgHolder);
bmp = new Bitmap();
//
mainTimer = new Timer(xmlCnt.galery.@delay);
mainTimer.addEventListener(TimerEvent.TIMER, mainTimerEvent);
mainTimer.start();
}
private function mainTimerEvent(e:TimerEvent):void {
// interrupt timer
mainTimer.stop();
addImage(mainTimer.currentCount % imgLst.length());
}
private function addImage(i):void {
loader = new Loader();
//
loader.contentLoaderInfo.addEventListener(HTTPStatusEvent.HTTP_STATUS, httpStatusHandler);
loader.contentLoaderInfo.addEventListener(Event.OPEN, openHandler);
loader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, progressHandler);
loader.contentLoaderInfo.addEventListener(Event.INIT, initHandler);
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, completeHandler);
//
loader.load(new URLRequest(imgLst[i].@image));
addChild(loader);
}
private function httpStatusHandler(e:HTTPStatusEvent):void {
trace("httpStatusHandler")
//trace("httpStatusHandler: " + e);
//trace("status: " + e.status);
switch (e.status) {
case 200:
// Valid image, do nothing.
break;
case 404:
// Invalid image
break;
default:
break;
}
}
private function openHandler(e:Event):void {
trace("openHandler")
loaderbar = new LoaderBar(e);
addChild(loaderbar);
}
private function progressHandler(e:Event):void {
trace("progressHandler")
//trace("progressHandler event: ")
loaderbar.updateLoader();
}
private function initHandler(e:Event):void {
trace("initHandler")
}
private function completeHandler(e:Event):void {
trace("completeHandler")
e.target.removeEventListener(Event.OPEN, openHandler);
e.target.removeEventListener(Event.COMPLETE, completeHandler);
e.target.removeEventListener(ProgressEvent.PROGRESS, progressHandler);
//
TweenMax.to(loaderbar, 1, {alpha:0, ease:Sine.easeInOut, onComplete:completeListenerLoaderBar});
//
//trace("before: " + imgHolder.numChildren)
while (imgHolder.numChildren > 1) {
imgHolder.removeChildAt(0);
}
//trace("after: " + imgHolder.numChildren)
//
bmp = e.currentTarget.content;
bmp.smoothing = true;
bmp.x = bmp.y = 0;
bmp.alpha = 0;
imgHolder.addChild(bmp);
//
imgBlurFilter = new BlurFilter(xmlCnt.galery.@blurX, xmlCnt.galery.@blurY, 2);
bmp.filters = [imgBlurFilter];
//
imgTween = new TweenMax(bmp, 4, {alpha:1, ease:Sine.easeInOut, onComplete:completeListenerTween,blurFilter:{blurX:0, blurY:0, ease:Sine.easeInOut}});
//
}
// tweenmax listener
private function completeListenerLoaderBar():void {
removeChild(loader);
removeChild(loaderbar);
}
private function completeListenerTween():void {
// resume mainTimer
mainTimer.start();
}
}
}
LoaderBar class
Code:
package marek {
import flash.display.*;
import flash.events.*;
public class LoaderBar extends Sprite {
private var eObj:Event;
private var sBar:Sprite;
public function LoaderBar(e:Event) {
this.eObj = e;
this.sBar = new Sprite;
this.sBar.graphics.moveTo(0, 0);
this.sBar.graphics.lineStyle(3, 0xff6600);
addChild(sBar);
}
public function updateLoader() {
this.sBar.graphics.lineTo((this.eObj.currentTarget.bytesLoaded / this.eObj.currentTarget.bytesTotal * 100), 0);
}
}
}
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Senior Member
[php]
i'd put int the complete event or someplace(you will have to figure it out);
PHP Code:
if ( i ==xml children .length ){
//remove progress bar
}
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So i´ve rewritten
the code a little bit and played with the getTimer function to
hide/show loaderbar. Maybe it´s not the best solution but anyway it seems to work - i saw that there´s a SOCKET_DATA Event that could be used, but this seem to be overloaded for such a small api like this.
so here´s the code
main class:
Code:
package marek {
import flash.display.*;
import flash.net.*
import flash.events.*;
import flash.utils.*;
import flash.filters.BlurFilter;
import com.greensock.*;
import com.greensock.easing.*;
public class main extends Sprite {
private var xmlCnt:XML;
private var imgLst:XMLList;
private var urlLdr:URLLoader;
private var imgData:BitmapData;
private var bmp:Bitmap;
private var imgHolder:MovieClip;
private var loader:Loader;
private var mainTimer:Timer;
private var imgFilter:BlurFilter;
private var i:uint;
private var startT:uint;
private var endT:uint;
private var loaderbar:LoaderBar;
private var imgTween:TweenMax;
public function main() {
stage.scaleMode = StageScaleMode.NO_SCALE;
stage.align = StageAlign.TOP_LEFT;
XMLLoader();
}
private function XMLLoader():void {
XML.ignoreComments = true;
XML.ignoreWhitespace = true;
urlLdr = new URLLoader();
urlLdr.addEventListener(Event.COMPLETE, completeListenerXML);
urlLdr.load(new URLRequest("main.xml"));
}
private function completeListenerXML(e:Event):void {
xmlCnt = new XML(urlLdr.data);
imgLst = xmlCnt.galery.item;
init();
}
private function init():void {
imgHolder = new MovieClip();
addChild(imgHolder);
//
mainTimer = new Timer(500);
mainTimer.addEventListener(TimerEvent.TIMER, mainTimerEvent);
mainTimer.start();
}
private function mainTimerEvent(e:TimerEvent):void {
// pause timer
mainTimer.stop();
addImage(mainTimer.currentCount % imgLst.length());
}
private function addImage(i:uint):void {
loader = new Loader();
loader.contentLoaderInfo.addEventListener(HTTPStatusEvent.HTTP_STATUS, httpStatusHandler);
loader.contentLoaderInfo.addEventListener(Event.OPEN, openHandler);
loader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, progressHandler);
loader.contentLoaderInfo.addEventListener(Event.INIT, initHandler);
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, completeHandler);
loader.load(new URLRequest(imgLst[i].@image));
}
private function httpStatusHandler(e:HTTPStatusEvent):void {
trace("4. httpStatusHandler")
//trace("httpStatusHandler: " + e);
//trace("status: " + e.status);
switch (e.status) {
case 200:
// Valid image, do nothing.
break;
case 404:
// Invalid image
break;
default:
break;
}
}
private function openHandler(e:Event):void {
trace("1. openHandler")
startT = getTimer();
loaderbar = new LoaderBar(e);
addChild(loaderbar);
}
private function progressHandler(e:Event):void {
trace("2. progressHandler")
endT = getTimer();
if ((endT - startT) >= 500) {
loaderbar.updateLoader();
} else {
loaderbar.reset();
}
}
private function initHandler(e:Event):void {
trace("3. initHandler")
imgData = Bitmap(loader.content).bitmapData;
bmp = new Bitmap(imgData);
imgFilter = new BlurFilter(xmlCnt.galery.@blurX, xmlCnt.galery.@blurY, 2);
bmp.filters = [imgFilter];
bmp.alpha = 0;
}
private function completeHandler(e:Event):void {
trace("5. completeHandler")
e.target.removeEventListener(Event.OPEN, openHandler);
e.target.removeEventListener(ProgressEvent.PROGRESS, progressHandler);
e.target.removeEventListener(Event.INIT, initHandler);
e.target.removeEventListener(Event.COMPLETE, completeHandler);
//
TweenMax.to(loaderbar, 1, {alpha:0, ease:Sine.easeInOut, onComplete:completeListenerLoaderBar});
//trace("before: " + imgHolder.numChildren)
while (imgHolder.numChildren > 1) {
imgHolder.removeChildAt(0);
}
//trace("after: " + imgHolder.numChildren)
imgHolder.addChild(bmp);
imgTween = new TweenMax(bmp, 4, {alpha:1, ease:Sine.easeInOut, onComplete:completeListenerTween,blurFilter:{blurX:0, blurY:0, ease:Sine.easeInOut}});
//
}
// tweenmax listeners
private function completeListenerLoaderBar():void {
removeChild(loaderbar);
}
private function completeListenerTween():void {
// resume mainTimer with new delay
mainTimer.delay = uint(xmlCnt.galery.@delay);
mainTimer.start();
}
}
}
LoaderBar class:
Code:
package marek {
import flash.display.*;
import flash.events.*;
public class LoaderBar extends Sprite {
private var eObj:Event;
private var sBar:Sprite;
public function LoaderBar(e:Event) {
this.eObj = e;
this.sBar = new Sprite;
this.sBar.graphics.moveTo(0, 0);
this.sBar.graphics.lineStyle(3, 0xff6600);
addChild(sBar);
}
public function updateLoader() {
this.sBar.graphics.lineTo((this.eObj.currentTarget.bytesLoaded / this.eObj.currentTarget.bytesTotal * 100), 0);
}
public function reset() {
this.sBar.graphics.clear();
}
}
}
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