Flex Module通信(2)——使用事件
上一篇讨论通过实现接口来实现Application和Modules的通信，本篇讨论通过使用事件实现Application和Modules的通信。在一个swf中，组件间的交互通信可以直接使用addEventListener和dispatchEvent来完成事件的传递。当然这样的标准做法也适用于Module。
通过addEventListener和dispatchEvent在Module发布事件：
1: <?xml version="1.0" encoding="utf-8"?>
2: <mx:Module xmlns:mx="http://www.adobe.com/2006/mxml" creationComplete="onComplete()">
3: <mx:Script>
4: <![CDATA[
5: import mx.events.DynamicEvent;
6:
7: [Bindable]private var command:String="";
8: private function onComplete():void
9: {
//从Application订阅
10: var sharedEventDispatcher:IEventDispatcher=systemManager.loaderInfo.sharedEvents;
11:
12: sharedEventDispatcher.addEventListener("init",onInit,false,0,true);
13: //通知Application：Module创建完成
14: sharedEventDispatcher.dispatchEvent(new Event(Event.COMPLETE));
15: }
16:
17: private function onInit(event:DynamicEvent):void
18: {
19: command=event.data as String;
20: }
21:
22: ]]>
23: </mx:Script>
24:
25: <mx:Panel id="panel" title="Module With Events. {command}" width="400" height="200"/>
26: </mx:Module>
27:
Application的代码
1: <?xml version="1.0" encoding="utf-8"?>
2: <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
3: <mx:Script>
4: <![CDATA[
5: import mx.events.DynamicEvent;
6: import mx.controls.Alert;
7: import mx.events.ModuleEvent;
8: import mx.modules.Module;
9:
10: private const MODULE_URL:String="ModuleWithEvents.swf";
11: [Bindable] private var moduleLoaded:Boolean;
12:
13: private function loadModule():void {
14: //从Module订阅通知
15: var sharedEventDispatcher:IEventDispatcher = moduleLoader.loaderInfo.sharedEvents;
16:
17: sharedEventDispatcher.addEventListener(Event.COMPLETE, onModuleCreated);
18:
19: moduleLoader.loadModule(MODULE_URL);
20:
21: moduleLoaded = true;
22:
23: }
24:
25: private function onModuleCreated(event:Event):void {
26:
27: trace("Module CreateComplete happened");
28:
29: //发送命令到Module
30: var sharedEventDispatcher:IEventDispatcher = moduleLoader.loaderInfo.sharedEvents;
31:
32: var dynamicEvent:DynamicEvent = new DynamicEvent("init");
33:
34: dynamicEvent.data = " Test Title!";
35:
36: sharedEventDispatcher.dispatchEvent(dynamicEvent);
37:
38: }
39:
40: private function unloadModule():void {
41: moduleLoader.unloadModule();
42: moduleLoaded = false;
43: }
44: ]]>
45:
46: </mx:Script>
47:
48: <mx:HBox>
49:
50: <mx:Button label="Load Module" click="loadModule()" />
51:
52: <mx:Button label="Unload Module" click="unloadModule()"
53:
54: enabled="{moduleLoaded}"/>
55:
56: </mx:HBox>
57:
58:
59:
60: <mx:ModuleLoader id="moduleLoader" y="30"/>
61: </mx:Application>
62:
运行结果，LoadModule后显示从Application传入的内容：
