[Flex] two ways of loading modules

最新推荐文章于 2022-04-04 21:01:34 发布

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本文介绍了两种在Flash中加载和卸载模块的方法：使用ModuleLoader API和ModuleManager API。这两种方式都包括了加载模块、指定加载完成后的事件监听器、实际加载模块以及卸载模块等步骤。此外，还提到了为了确保加载后的模块能够安全地进行通信，需要添加creationComplete事件监听器。

There're two ways of loading and unloading modules:

ModuleLoader - higher level API
ModuleManager - lower level API

1. Using ModuleLoader

1) define a ModuleLoader


<mx:ModuleLoader id="moduleLoader"/>

2) when the button of loading the module is clicked


moduleLoader.url = "SimpleModule.swf";
moduleLoader.loadModule();

3) add module load ready listener


moduleLoader.addEventListener( ModuleEvent.READY, moduleReadyHandler);

4) define the listener method


private function moduleReadyHandler( event: ModuleEvent ): void {
    trace("SimpleModule is loaded");
}

5) to unload a module


moduleLoader.unloadModule();

2. Using ModuleManager

1) load the module and specify the ready event listener


info = ModuleManager.getModule("SimpleModule.swf");
info.addEventListener(ModuleEvent.READY, moduleReadyHandler);
info.load();

2) unload the module by using the same info object


info.addEventListener(ModuleEvent.UNLOAD, moduleUnloadHandler);
info.unload();

No matter what method is used, we need to make sure when the loaded Module is safe for communication. Here is how to do it: by add a creationComplete listener in moduleReadyHandler.


moduleLoader.child.addEventListener(FlexEvent.CREATION_COMPLETE, 
      moduleCreationCompleteHandler);

inside moduleCreationCompleteHandler:


protected function moduleCreationCompleteHandler(event:FlexEvent):void
{
    moduleLoader.child.removeEventListener(FlexEvent.CREATION_COMPLETE,
      moduleCreationCompleteHandler);

   // further processings...
}

Someone might encounter the memory leak issue when trying to unload a module. This is a nice article to look into:

http://blogs.adobe.com/aharui/2009/08/what_we_know_about_unloading_m.html