如何在运行时在 Flex 中获取 BorderContainer 的 ID
how to get id of BorderContainer at runtime in Flex
我在运行时尝试获取 BorderContainer 的 ID 时遇到错误。我尝试使用 getStyle 但它也失败了。
<s:Panel id="colorPanel"
title="Dem display color"
width="500" height="500">
<s:layout>
<s:BasicLayout/>
</s:layout>
<s:Label id="label" y="4" horizontalCenter="0"/>
<s:BorderContainer id="Box1" x="70" y="70" height="50" width="50" backgroundColor="#0000ff">
</s:BorderContainer>
<s:BorderContainer id="Box2" x="90" y="90" height="51" width="50" backgroundColor="#00ff00">
</s:BorderContainer>
<s:BorderContainer id="Box3" x="50" y="50" height="52" width="50" backgroundColor="#ff0000">
</s:BorderContainer>
<s:Button label="Click" click="
colorPanel.setElementIndex(colorPanel.getElementAt(0),3);
label.text = ""+colorPanel.getElementAt(0).id ;
">
</s:Button>
</s:Panel>
我发现 Adobe 的解决方案似乎过于僵化。当我将返回的元素转换为 BorderContainer 时,我能够获得 Id 的值。所以我们必须忍受它,直到 Adobe 降低编译器对我们的期望。
label.text = ""+ BorderContainer(colorPanel.getElementAt(0)).id ;
不用转换为 BorderContainer,转换为 UIComponent 是安全的。在您的示例中,当返回的元素是 Label 而不是 BorderContainer 时,它会崩溃。您可以按以下方式进行:
<?xml version="1.0"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark">
<fx:Script><![CDATA[
import mx.core.UIComponent;
]]></fx:Script>
<s:Panel id="colorPanel"
title="Dem display color"
width="500" height="500">
<s:layout>
<s:BasicLayout/>
</s:layout>
<s:Label id="label" text="Red" y="4" horizontalCenter="0"/>
<s:BorderContainer id="Blue" x="70" y="70" height="50" width="50" backgroundColor="#0000ff">
</s:BorderContainer>
<s:BorderContainer id="Green" x="90" y="90" height="51" width="50" backgroundColor="#00ff00">
</s:BorderContainer>
<s:BorderContainer id="Red" x="50" y="50" height="52" width="50" backgroundColor="#ff0000">
</s:BorderContainer>
<s:Button label="Click" click="{
colorPanel.setElementIndex(colorPanel.getElementAt(1),3);
label.text = UIComponent(colorPanel.getElementAt(3)).id;}"/>
</s:Panel>
</s:Application>
我在运行时尝试获取 BorderContainer 的 ID 时遇到错误。我尝试使用 getStyle 但它也失败了。
<s:Panel id="colorPanel"
title="Dem display color"
width="500" height="500">
<s:layout>
<s:BasicLayout/>
</s:layout>
<s:Label id="label" y="4" horizontalCenter="0"/>
<s:BorderContainer id="Box1" x="70" y="70" height="50" width="50" backgroundColor="#0000ff">
</s:BorderContainer>
<s:BorderContainer id="Box2" x="90" y="90" height="51" width="50" backgroundColor="#00ff00">
</s:BorderContainer>
<s:BorderContainer id="Box3" x="50" y="50" height="52" width="50" backgroundColor="#ff0000">
</s:BorderContainer>
<s:Button label="Click" click="
colorPanel.setElementIndex(colorPanel.getElementAt(0),3);
label.text = ""+colorPanel.getElementAt(0).id ;
">
</s:Button>
</s:Panel>
我发现 Adobe 的解决方案似乎过于僵化。当我将返回的元素转换为 BorderContainer 时,我能够获得 Id 的值。所以我们必须忍受它,直到 Adobe 降低编译器对我们的期望。
label.text = ""+ BorderContainer(colorPanel.getElementAt(0)).id ;
不用转换为 BorderContainer,转换为 UIComponent 是安全的。在您的示例中,当返回的元素是 Label 而不是 BorderContainer 时,它会崩溃。您可以按以下方式进行:
<?xml version="1.0"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark">
<fx:Script><![CDATA[
import mx.core.UIComponent;
]]></fx:Script>
<s:Panel id="colorPanel"
title="Dem display color"
width="500" height="500">
<s:layout>
<s:BasicLayout/>
</s:layout>
<s:Label id="label" text="Red" y="4" horizontalCenter="0"/>
<s:BorderContainer id="Blue" x="70" y="70" height="50" width="50" backgroundColor="#0000ff">
</s:BorderContainer>
<s:BorderContainer id="Green" x="90" y="90" height="51" width="50" backgroundColor="#00ff00">
</s:BorderContainer>
<s:BorderContainer id="Red" x="50" y="50" height="52" width="50" backgroundColor="#ff0000">
</s:BorderContainer>
<s:Button label="Click" click="{
colorPanel.setElementIndex(colorPanel.getElementAt(1),3);
label.text = UIComponent(colorPanel.getElementAt(3)).id;}"/>
</s:Panel>
</s:Application>