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Flex-如何在另一個組件的一個組件中定義功能?

[英]Flex - How can I define a function in one component from another?

我是一個完整的Flex / Flash新手,運行Adobe Flash Builder 4 Beta2。我有一個主要組件,它需要能夠調用多個彈出窗口,每個彈出窗口除了一個功能和幾個標簽外幾乎都是相同的。 顯然,我更希望能夠定義此函數並在調用彈出窗口時更改這些標簽,而不是擁有大量使用幾乎相同的代碼的.mxml文件,我只是不知道該怎么做。 我想出了如何更改標簽的方法,但不確定如何重新定義功能。

為了簡單起見,假設我的代碼如下所示:

main.mxml:

<?xml version="1.0" encoding="utf-8"?>
    <mx:Module xmlns:fx="http://ns.adobe.com/mxml/2009" :s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/halo" creationComplete="init()">
        <fx:Script>
            <![CDATA[
                import mx.controls.Alert;
                import mx.managers.PopUpManager;

                protected function init():void
                {
                    var alertWindow:IFlexDisplayObject = PopUpManager.createPopUp(FlexGlobals.topLevelApplication as DisplayObject, popup, true);
                    PopUpManager.centerPopUp(alertWindow);
                    var popInstance:transmitRoundPop = alertWindow as transmitRoundPop;
                    popInstance.btnTest.label = "NEW";
                }
            ]]>
        </fx:Script>
    </mx:Module>

popup.mxml:

<?xml version="1.0" encoding="utf-8"?>
    <s:Group xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/halo" width="400" height="300" xmlns:flash="services.flash.*">
        <fx:Script>
            <![CDATA[  
                import mx.controls.Alert;  
                import mx.managers.PopUpManager;  

                public function test():void
                {
                    Alert.show("ORIGINAL");
                    PopUpManager.removePopUp(this);
                }
            ]]>
        </fx:Script>
        <s:Panel x="10" y="10" width="380" height="280" title="Test" id="pnlTest">
                <s:Button x="131" y="104" label="OLD" id="btnTest" click="test()"/>
        </s:Panel>
    </s:Group>

現在說我想在main.mxml中調用它時在popup.mxml中更改test() ...我該怎么做? 請提供詳細信息...記住我是菜鳥:-)

當然,在發布問題后,這個想法立即浮現在我的腦海。 我以為我會在這里發布解決方案,而不是僅僅刪除問題,以防其他人受到影響。

我只是從popup.mxml中完全取出test() ,並在main.mxml中將init()修改為如下所示:

protected function init():void
{
    var alertWindow:IFlexDisplayObject = PopUpManager.createPopUp(FlexGlobals.topLevelApplication as DisplayObject, popup, true);
    PopUpManager.centerPopUp(alertWindow);
    var popInstance:transmitRoundPop = alertWindow as transmitRoundPop;
    popInstance.btnTest.label = "NEW";
    popInstance.btnTest.addEventListener("click", function():void { Alert.show("REDEFINED"); });
}

如果我得到您的要求,可以使test()為一個函數變量,並為其提供公共訪問權限,以便其他組件可以對其進行更改。

    <fx:Script>
        <![CDATA[  
            import mx.controls.Alert;  
            import mx.managers.PopUpManager;  

            // "test" is now a function variable, 
            // you change it just like any other variable, 
            // but you can call it as well, just like before.
            public var test:Function;

            public function defaultTest():void
            {
                Alert.show("ORIGINAL");
                PopUpManager.removePopUp(this);
            }

            protected function init():void
            {
            // Setting a default value for test
            // otherwise it would give you an error when calling
            // an unassigned function variable.
                this.test = defaultTest; 
                ...
            }
        ]]>
    </fx:Script>

現在在另一個組件中:

public function mainTest():void
{
    ...
}

...
myPopup.test = mainTest;  // setting the variable, note that there are no parentheses.
myPopup.test();   // running the function, note that there are now parentheses.

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