使用FB4，我想改变开放火花DropDownList的高度。默认情况下，最多可以在滚动前显示6个项目。我的下拉列表包含7个项目，所以我想更改打开的下拉列表的高度以适合所有7个项目而不滚动。作为解决方法，我已经更改了项目的字体大小，使它们更小，所有7适合，但较小的字体看起来不太好。有没有办法改变这个高度？我对Flash很新，所以如果这是一个复杂的解决方案，请详细说明:-)。
解决方法
问题是，在Flex 4中，DropDownListSkin已经为您可能使用的默认外观定义了maxHeight =“134”。如果对象延伸超出该高度，则强制滚动条显示。所有您需要做的是将其DropDownListSkin代码复制/粘贴到自定义皮肤中，并通过CSS将其应用于您的DropDownList：
VariableHeightDropDownListSkin
<?xml version="1.0" encoding="utf-8"?>
<s:Skin xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
alpha.disabled=".5">
<!-- host component -->
<fx:Metadata>
<![CDATA[
/**
* @copy spark.skins.spark.ApplicationSkin#hostComponent
*/
[HostComponent("spark.components.DropDownList")]
]]>
</fx:Metadata>
<s:states>
<s:State name="normal" />
<s:State name="open" />
<s:State name="disabled" />
</s:states>
<s:PopUpAnchor id="popUp" displayPopUp.normal="false" displayPopUp.open="true" includeIn="open"
left="0" right="0" top="0" bottom="0" itemDestructionPolicy="auto"
popUpPosition="below" popUpWidthMatchesAnchorWidth="true">
<!-- removed maxHeight! -->
<s:Group id="dropDown" minHeight="22">
<!-- border/fill -->
<s:Rect left="0" right="0" top="0" bottom="0">
<s:stroke>
<s:SolidColorStroke color="0x5380D0" />
</s:stroke>
<s:fill>
<s:SolidColor color="0xFFFFFF" />
</s:fill>
</s:Rect>
<s:Scroller left="0" top="0" right="0" bottom="0" focusEnabled="false" minViewportInset="1">
<s:DataGroup id="dataGroup" itemRenderer="spark.skins.spark.DefaultItemRenderer">
<s:layout>
<s:VerticalLayout gap="0" horizontalAlign="contentJustify"/>
</s:layout>
</s:DataGroup>
</s:Scroller>
<s:filters>
<s:DropShadowFilter blurX="20" blurY="20" distance="7" angle="90" alpha="0.45" color="0x6087CC" />
</s:filters>
</s:Group>
</s:PopUpAnchor>
<s:Button id="openButton" left="0" right="0" top="0" bottom="0" focusEnabled="false"
skinClass="spark.skins.spark.DropDownListButtonSkin" />
<s:Label id="labelDisplay" verticalAlign="middle" lineBreak="explicit"
mouseEnabled="false" mouseChildren="false"
left="7" right="30" top="2" bottom="2" width="75" verticalCenter="1" />
</s:Skin>
样品申请
<?xml version="1.0" encoding="utf-8"?>
<s:Application
xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx">
<fx:Style>
@namespace mx "library://ns.adobe.com/flex/mx";
@namespace s "library://ns.adobe.com/flex/spark";
s|DropDownList
{
skinClass: ClassReference("VariableHeightDropDownListSkin");
}
</fx:Style>
<s:DropDownList labelField="name" horizontalCenter="0" verticalCenter="0">
<s:layout>
<s:VerticalLayout requestedRowCount="7"/>
</s:layout>
<s:dataProvider>
<mx:ArrayCollection>
<fx:Object name="one"/>
<fx:Object name="two"/>
<fx:Object name="three"/>
<fx:Object name="four"/>
<fx:Object name="five"/>
<fx:Object name="six"/>
<fx:Object name="seven"/>
</mx:ArrayCollection>
</s:dataProvider>
</s:DropDownList>
</s:Application>
让我知道，如果这有帮助，槊