在這裏我只是自己做個實例並記錄一下..
首先~自定義Flex加載的原理其實就是繼承mx.preloaders.DownloadProgressBar類..然後重寫相關的方法..
{
import flash.display.*;
import flash.events.*;
import flash.net.*;
import flash.text.TextField;
import flash.text.TextFormat;
import mx.events.FlexEvent;
import mx.preloaders.DownloadProgressBar;
public class LoadingExampleProgressBar extends DownloadProgressBar
{
private var logo:Loader;
private var txt:TextField;
private var _preloader:Sprite;
public function LoadingExampleProgressBar()
{
logo = new Loader();
logo.load(new URLRequest("l4cd.png"));
addChild(logo);
var style:TextFormat = new TextFormat(null,null,0xFFFFFF,null,null,null,null,null,"center");
txt = new TextField();
txt.defaultTextFormat = style;
txt.width = 200;
txt.selectable = false;
txt.height = 20;
addChild(txt);
super();
}
//最重要的代碼就在這裏..重寫preloader,讓swf執行加載的時候~進行你希望的操作~
override public function set preloader(value:Sprite):void{
_preloader = value
//四個偵聽~分別是 加載進度 / 加載完畢 / 初始化進度 / 初始化完畢
_preloader.addEventListener(ProgressEvent.PROGRESS,load_progress);
_preloader.addEventListener(Event.COMPLETE,load_complete);
_preloader.addEventListener(FlexEvent.INIT_PROGRESS,init_progress);
_preloader.addEventListener(FlexEvent.INIT_COMPLETE,init_complete);
stage.addEventListener(Event.RESIZE,resize)
resize(null);
}
private function remove():void{
_preloader.removeEventListener(ProgressEvent.PROGRESS,load_progress);
_preloader.removeEventListener(Event.COMPLETE,load_complete);
_preloader.removeEventListener(FlexEvent.INIT_PROGRESS,init_progress);
_preloader.removeEventListener(FlexEvent.INIT_COMPLETE,init_complete);
stage.removeEventListener(Event.RESIZE,resize)
}
private function resize(e:Event):void{
logo.x = (stage.stageWidth - 40)/2;
logo.y = (stage.stageHeight - 80)/2;
txt.x = (stage.stageWidth - 200)/2;
txt.y = logo.y + 40+5;
graphics.clear();
graphics.beginFill(0x333333);
graphics.drawRect(0,0,stage.stageWidth,stage.stageHeight);
graphics.endFill();
}
private function load_progress(e:ProgressEvent):void{
txt.text = "正在加載..."+int(e.bytesLoaded/e.bytesTotal*100)+"%";
}
private function load_complete(e:Event):void{
txt.text = "加載完畢!"
}
private function init_progress(e:FlexEvent):void{
txt.text = "正在初始化..."
}
private function init_complete(e:FlexEvent):void{
txt.text = "初始化完畢!"
remove()
//最後這個地方需要dpe一個Event.COMPLETE事件..表示加載完畢讓swf繼續操作~
dispatchEvent(new Event(Event.COMPLETE))
}
}
}
自定義了加載類後..我們新建一個app測試一下..
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"
preloader="LoadingExampleProgressBar"
backgroundGradientAlphas="[1.0, 1.0]" backgroundGradientColors="[#333333, #333333]"
</mx:Application>
不需要寫任何代碼..
只需要在Application 標籤下設置preloader爲你剛剛自定義的類(我這是命令叫LoadingExampleProgressBar)
保存後即可看到效果~