Apache flex Flex-如何更改开放下拉列表高度
使用FB4,我想更改打开的spark DropDownList的高度。默认情况下,滚动前最多显示6项。我的下拉列表包含7个项目,因此我想更改打开下拉列表的高度,以适应所有7个项目,而无需滚动。作为一种解决方法,我已经更改了项目的字体大小,使其更小,并且所有7个项目都适合,但是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比较陌生,所以如果它是一个复杂的解决方案,请详细说明:-)。在FB3中,它是行数,因为下拉列表是列表控件的后代。FB4可能是类似的Apache flex Flex-如何更改开放下拉列表高度,apache-flex,drop-down-menu,height,rowcount,flex-spark,Apache Flex,Drop Down Menu,Height,Rowcount,Flex Spark,使用FB4,我想更改打开的spark DropDownList的高度。默认情况下,滚动前最多显示6项。我的下拉列表包含7个项目,因此我想更改打开下拉列表的高度,以适应所有7个项目,而无需滚动。作为一种解决方法,我已经更改了项目的字体大小,使其更小,并且所有7个项目都适合,但是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比较陌生,所以如果它是一个复杂的解决方案,请详细说明:-)。在FB3中,它是行数,因为下拉列表是列表控件的后代。FB4可能是类似的 myDropdown.rowC
myDropdown.rowCount = 7;
我通常使用更像
myDropdown.rowCount = myDataProvider.lenght();
不幸的是,在Flex 4中,这比在Flex 3中要复杂得多:
您应该能够使用更高的
requestedRowCount
()为DropDownList定义布局,但是对于>6行,您需要做更多的工作()。问题是,在Flex 4中,DropDownList皮肤已经为您可能正在使用的默认皮肤定义了maxHeight=“134”
。如果对象延伸超过该高度,则强制滚动条出现。您只需将其DropDownListSkin代码复制/粘贴到自定义皮肤中,并通过CSS将其应用到您的DropDownList:
可变高度下拉列表皮肤
<?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>
<?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>
示例应用程序
<?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>
<?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>
@名称空间mx“library://ns.adobe.com/flex/mx";
@命名空间s“library://ns.adobe.com/flex/spark";
s |下拉列表
{
skinClass:ClassReference(“可变高度下拉列表皮肤”);
}
如果有帮助,请告诉我,
Lanceviatropos的答案会起作用,但是你应该尽量避免覆盖整个皮肤 在本例中,您将注意到,在viatropos的VariableHeightDropDownListSkin代码中,删除maxHeight属性的组中,还指定了一个“id” 现在看看DropDownList的文档,您会注意到SkinParts部分中有一个“dropDown”皮肤部分。这实际上是DropDownList的一个属性 因此,您可以简单地使用actionscript(我在这里使用UIComponent.DEFAULT\u MAX\u HEIGHT,但您可以使用任何您想要的):
如果使用verticalLayout的属性requestedRowCount,不是更容易吗
<s:DropDownList dataProvider="{myDataProvider}">
<s:layout>
<s:VerticalLayout requestedRowCount="10"/>
</s:layout>
</s:DropDownList>
这是迄今为止我发现的最简单的解决方案。感谢您发布这篇文章。值得一提的是,这可能只适用于Flash Builder 4.5及更新版本(在最初的文章中,我使用的是FB4)。请参阅@PieterKuijpers-answer,其中有一个指向Flex问题的链接,其中显示该问题已在4.5.0.17882中得到解决。使用此选项,不要忘记添加gap=“0”,horizontallign=“contentJustify”如果我想获得spark comboBox的rowCount属性,那么它不是同一个朋友,Flex 4Works中不存在mx的下拉列表
属性,但spark不存在。