Создайте собственный скин, который скрывает openButton. Это обязательная часть скина, поэтому вам придется установить ее видимость на false.
<?xml version="1.0" encoding="utf-8"?>
<!--
ADOBE SYSTEMS INCORPORATED
Copyright 2008 Adobe Systems Incorporated
All Rights Reserved.
NOTICE: Adobe permits you to use, modify, and distribute this file
in accordance with the terms of the license agreement accompanying it.
-->
<!--- The default skin class for the Spark ComboBox component.
The skin for the anchor button for a ComboBox component
is defined by the ComboBoxButtonSkin class. The skin for the text input
is defined by the ComboBoxTextInputSkin class.
@see spark.components.ComboBox
@see spark.skins.spark.ComboBoxButtonSkin
@langversion 3.0
@playerversion Flash 10
@playerversion AIR 1.5
@productversion Flex 4
-->
<s:SparkSkin xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:fb="http://ns.adobe.com/flashbuilder/2009" alpha.disabled=".5">
<!-- host component -->
<fx:Metadata>
<![CDATA[
/**
* @copy spark.skins.spark.ApplicationSkin#hostComponent
*/
[HostComponent("spark.components.ComboBox")]
]]>
</fx:Metadata>
<fx:Script fb:purpose="styling">
<![CDATA[
private var paddingChanged:Boolean;
private var cornerRadiusChanged:Boolean;
private var cornerRadius:Number = 0;
/* Define the content fill items that should be colored by the "contentBackgroundColor" style. */
static private const contentFill:Array = ["bgFill"];
/**
* @private
*/
override public function get contentItems():Array {return contentFill};
/**
* @private
*/
override protected function commitProperties():void
{
super.commitProperties();
if (paddingChanged && textInput)
{
// Push padding styles into the textDisplay
var padding:Number;
padding = getStyle("paddingLeft");
if (textInput.getStyle("paddingLeft") != padding)
textInput.setStyle("paddingLeft", padding);
padding = getStyle("paddingTop");
if (textInput.getStyle("paddingTop") != padding)
textInput.setStyle("paddingTop", padding);
padding = getStyle("paddingRight");
if (textInput.getStyle("paddingRight") != padding)
textInput.setStyle("paddingRight", padding);
padding = getStyle("paddingBottom");
if (textInput.getStyle("paddingBottom") != padding)
textInput.setStyle("paddingBottom", padding);
paddingChanged = false;
}
if (cornerRadiusChanged)
{
cornerRadiusChanged = false;
/* var cr:Number = getStyle("cornerRadius");
if (openButton)
openButton.setStyle("cornerRadius", cr);
if (textInput)
textInput.setStyle("cornerRadius", cr); */
}
}
/**
* @private
*/
override public function styleChanged(styleProp:String):void
{
var allStyles:Boolean = !styleProp || styleProp == "styleName";
super.styleChanged(styleProp);
if (allStyles || styleProp.indexOf("padding") == 0)
{
paddingChanged = true;
invalidateProperties();
}
if (allStyles || styleProp == "cornerRadius")
{
cornerRadiusChanged = true;
invalidateProperties();
}
}
/**
* @private
*/
override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void
{
if (getStyle("borderVisible") == false)
{
if (border)
border.visible = false;
if (background)
{
background.left = background.top = background.right = background.bottom = 0;
}
if (scroller)
scroller.minViewportInset = 0;
}
else
{
if (border)
border.visible = true;
if (background)
{
background.left = background.top = background.right = background.bottom = 1;
}
if (scroller)
scroller.minViewportInset = 1;
}
if (dropShadow)
dropShadow.visible = getStyle("dropShadowVisible");
//openButton.setStyle("cornerRadius", getStyle("cornerRadius"));
if (borderStroke)
{
borderStroke.color = getStyle("borderColor");
borderStroke.alpha = getStyle("borderAlpha");
}
super.updateDisplayList(unscaledWidth, unscaledHeight);
}
]]>
</fx:Script>
<s:states>
<s:State name="normal" />
<s:State name="open" />
<s:State name="disabled" />
</s:states>
<!---
The PopUpAnchor control that opens the drop-down list.
<p>In a custom skin class that uses transitions, set the
<code>itemDestructionPolicy</code> property to <code>none</code>.</p>
-->
<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">
<!---
This includes borders, background colors, scrollers, and filters.
@copy spark.components.supportClasses.DropDownListBase#dropDown
-->
<s:Group id="dropDown">
<!-- drop shadow -->
<!--- @private -->
<s:RectangularDropShadow id="dropShadow" blurX="20" blurY="20" alpha="0.45" distance="7"
angle="90" color="#000000" left="0" top="0" right="0" bottom="0"/>
<!-- border -->
<!--- @private -->
<s:Rect id="border" left="0" right="0" top="0" bottom="0">
<s:stroke>
<!--- @private -->
<s:SolidColorStroke id="borderStroke" weight="1"/>
</s:stroke>
</s:Rect>
<!-- fill -->
<!--- Defines the appearance of drop-down list's background fill. -->
<s:Rect id="background" left="1" right="1" top="1" bottom="1" >
<s:fill>
<!---
@private
The color of the drop down's background fill.
The default color is 0xFFFFFF.
-->
<s:SolidColor id="bgFill" color="0xFFFFFF" />
</s:fill>
</s:Rect>
<!--- @private -->
<s:Scroller id="scroller" left="0" top="0" right="0" bottom="0" hasFocusableChildren="false" minViewportInset="1">
<!--- @copy spark.components.SkinnableDataContainer#dataGroup-->
<s:DataGroup id="dataGroup" itemRenderer="spark.skins.spark.DefaultItemRenderer">
<s:layout>
<s:VerticalLayout gap="0" horizontalAlign="contentJustify" requestedMinRowCount="1" requestedMaxRowCount="6"/>
</s:layout>
</s:DataGroup>
</s:Scroller>
</s:Group>
</s:PopUpAnchor>
<!--- The default skin is ComboBoxButtonSkin.
@copy spark.components.supportClasses.DropDownListBase#openButton
@see spark.skins.spark.ComboBoxButtonSkin -->
<!---- my only change is here ---->
<s:Button id="openButton" width="19" right="0" top="0" bottom="0" focusEnabled="false"
skinClass="spark.skins.spark.ComboBoxButtonSkin" tabEnabled="false" visible="false" />
<!--- @copy spark.components.ComboBox#textInput -->
<s:TextInput id="textInput" enabled.disabled="false"
left="0" right="18" top="0" bottom="0"
skinClass="spark.skins.spark.ComboBoxTextInputSkin"/>
</s:SparkSkin>
Используйте это так:
<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx">
<s:ComboBox skinClass="com.flextras.skins.ComboBoxNoDownArrow">
<s:dataProvider>
<mx:ArrayCollection>
<fx:String>Flash</fx:String>
<fx:String>Director</fx:String>
<fx:String>Dreamweaver</fx:String>
<fx:String>ColdFusion</fx:String>
<fx:String>Flash</fx:String>
<fx:String>Director</fx:String>
<fx:String>Dreamweaver</fx:String>
<fx:String>ColdFusion</fx:String>
<fx:String>Flash</fx:String>
<fx:String>Director</fx:String>
<fx:String>Dreamweaver</fx:String>
<fx:String>ColdFusion</fx:String>
</mx:ArrayCollection>
</s:dataProvider>
</s:ComboBox>
</s:WindowedApplication>
Вероятно, вы можете настроить кожу больше, если это необходимо; например, изменив значение «Right» на 0 в textInput. У меня ушло больше времени на запуск Flash Builder, чем на написание кода, поэтому я предлагаю вам прочитать эту документацию в качестве справочного материала по Skinning в архитектуре spark.