[Flex] PopUpButton系列 —— 弹出菜单的行高设置

<?xml version="1.0" encoding="utf-8"?>
<!--Flex中如何通过variableRowHeight样式减少PopUpButton与弹出菜单间间距的例子 PopUpButtonRowHeight.mxml -->
<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" minWidth="955" minHeight="600"  >
    <fx:Script>
        <![CDATA[
            import mx.controls.Menu;
            import mx.events.DropdownEvent;
            import mx.events.FlexEvent;
            import mx.utils.ObjectUtil;
            
            protected function popUpButton1_initializeHandler(event:FlexEvent):void
            {
                var menu:Menu = new Menu();
                menu.showRoot = false;
                menu.labelField = "@label";
                menu.dataProvider = ObjectUtil.copy(data);
                popUpButton1.popUp = menu;

            }
            protected function popUpButton2_initializeHandler(event:FlexEvent):void
            {
                var menu:Menu = new Menu();
                menu.showRoot = false;
                menu.labelField = "@label";
                menu.dataProvider = ObjectUtil.copy(data);
                menu.variableRowHeight = true;
                popUpButton2.popUp = menu;

            }
            protected function popUpButton1_openHandler(event:DropdownEvent):void
            {
                popUpButton1.open();
                popUpButton2.open();

            }
            
            protected function popUpButton1_creationCompleteHandler(event:FlexEvent):void
            {
                var pUB:PopUpButton = event.currentTarget as PopUpButton;
                // resize and open
                pUB.popUp.width = pUB.width;
                pUB.open();

            }
            
        ]]>
    </fx:Script>
    <fx:Declarations>
        <!-- 将非可视元素（例如服务、值对象）放在此处 -->
        <fx:XML id="data" source="data.xml"/>
    </fx:Declarations>
    <fx:Style>
        @namespace s "library://ns.adobe.com/flex/spark";
        @namespace mx "library://ns.adobe.com/flex/mx";
        mx|PopUpButton {
            openDuration: 0;
            closeDuration: 0;
            fontWeight: normal;
            textAlign: left;
        }

    </fx:Style>
    <s:HGroup>
        <mx:PopUpButton id="popUpButton1" label="variableRowHeight = false" openAlways="true" width="250" initialize="popUpButton1_initializeHandler(event)" creationComplete="popUpButton1_creationCompleteHandler(event)" open="popUpButton1_openHandler(event)"/>
        <mx:PopUpButton id="popUpButton2" label="variableRowHeight = true" openAlways="true" width="250" initialize="popUpButton2_initializeHandler(event)" creationComplete="popUpButton1_creationCompleteHandler(event)" open="popUpButton1_openHandler(event)"/>
    </s:HGroup>
</s:Application>