AS3:如何在事件侦听器函数中从LoaderInfo获取动态加载程序URL？

Question

我正在加载许多图片,并且正在使用数组来执行此操作.

loader[i].load(new URLRequest(picture[i]));

我的事件监听器功能启用如下:

loader[i].contentLoaderInfo.addEventListener(Event.COMPLETE, onComplete);   

我的onComplete事件处理程序显示了这个:

trace(e.target); //OUTPUT: [object LoaderInfo]

我在LoaderInfo中查找了可能识别哪个加载器启动了监听器("i"的值)的属性,这样我就可以专门用于每个加载器,如下所示:

bitmapDataArr[i] = e.target.content.bitmapData;
bmVisArr[i] = new Bitmap(bitmapDataArr[i]);

但无法确定哪个"i"启动了侦听器的特定实例.

有任何想法吗？我试着给LoaderInfo一个名字无济于事.我仍然无法提取讨厌的小识别号码.

EDIT显示加载器和onComplete函数的循环:

for (i = 0; i < 10; i++) {
    loader[i] = new Loader();
    loader[i].contentLoaderInfo.addEventListener(Event.COMPLETE, onComplete, false, 0, true);           
    loader[i].load(new URLRequest(letter[i]));
}

private function onComplete(e:Event):void {
    trace("e.target",e.target); //OUTPUT: e.target    [object LoaderInfo]
    var LI:LoaderInfo = e.target as LoaderInfo;
    var eNum:int = (????);
    bitmapDataArr[eNum] = e.target.content.bitmapData;
    bmVisArr[eNum] = new Bitmap(bitmapDataArr[eNum]);
}

Answer 1

你需要以某种方式为i价值带来onComplete功能.例如,在this上下文中或通过参数.

PS:使用弱参考更容易.字典而不是删除属性,虽然我不太了解AS3.

这是一个示例,还显示了如何删除事件侦听器(包括其回调函数):

/* An object containing callback
 * functions used along with event listeners.
 */
const callbacks: Object = {};


/* This function will re-declare and hoist i
 * in itself. */
private function loop(i: uint): void {
    loader[i] = new Loader;

    const wrapped =
    callbacks[i] = function wrapper(...args) {
        // Pass all arguments (respectively event and i)
        onComplete.apply(null, args);

        // Function#apply(thisContext, arguments)
        // Rest exp. isn't implemented yet, else we could just do:
        // onComplete(...args);
    };

    loader[i].contentLoaderInfo
        .addEventListener(Event.COMPLETE, wrapped, false,
            0, true);

    loader[i].load(new URLRequest(letter[i]));
};

for (var i: uint = 0; i < 10; ++i) loop(i);

private function onComplete(e: Event, i: uint): void {
    const loaderInfo: LoaderInfo = e.target as LoaderInfo;

    bitmapDataArr[i] = e.target
        .content.bitmapData;

    bmVisArr[i] = new Bitmap(bitmapDataArr[i]);

    loader[i].contentLoaderInfo
        .removeEventListener(
            Event.COMPLETE, callbacks[i]
        );

    // Deletes the property that stores
    // the function inside callbacks
    delete callbacks[i];
}