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This example sets an Icon with two states on a Spark Button using a Spark Skin.

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IconButton.as
ActionScript
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/**
To using in a Flash Builder project:
 
<controls:IconButton icon="@Embed('assets/images/icon.png')" iconOver="@Embed('assets/images/icon_over.png')" label="Label Button" skinClass="com.thanksmister.components.skins.IconButtonSkin"/>
*/
package com.thanksmister.components.controls
{
import spark.components.Button;
import spark.primitives.BitmapImage;
public class IconButton extends Button
{
public function IconButton()
{
super();
}
//----------------------------------
// icon for up state
//----------------------------------
private var _icon:Class;
private var _iconOver:Class;
[Bindable]
public function get icon():Class
{
return _icon;
}
public function set icon(val:Class):void
{
_icon = val;
if (iconElement != null)
iconElement.source = _icon;
}
//----------------------------------
// icon for over and down state
//----------------------------------
private var _iconOver:Class;
[Bindable]
public function get iconOver():Class
{
return _iconOver;
}
 
public function set iconOver(val:Class):void
{
_iconOver = val;
if (iconElement != null)
iconElement.source = _iconOver;
}
//--------------------------------------------------------------------------
//
// Skin Parts
//
//--------------------------------------------------------------------------
[SkinPart(required = "false")]
public var iconElement:BitmapImage;
//--------------------------------------------------------------------------
//
// Overridden methods
//
//--------------------------------------------------------------------------
override protected function getCurrentSkinState():String
{
var state:String = super.getCurrentSkinState();
if (state == "up" || state == "disabled") {
iconElement.source = icon;
} else if (state == "over" || state == "down") {
iconElement.source = iconOver;
}
return state;
}
override protected function partAdded(partName:String, instance:Object):void
{
super.partAdded(partName, instance);
if (icon !== null && instance == iconElement) {
iconElement.source = icon;
}
}
}
}
IconButtonSkin.mxml
XML
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<?xml version="1.0" encoding="utf-8"?>
<s:SparkButtonSkin xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:fb="http://ns.adobe.com/flashbuilder/2009"
minWidth="21" minHeight="21"
alpha.disabled="0.5">
<fx:Metadata>
[HostComponent("com.thanksmister.components.controls.IconButton")]
</fx:Metadata>
<fx:Script fb:purpose="styling">
<![CDATA[
import spark.components.Group;
/* Define the skin elements that should not be colorized.
For button, the graphics are colorized but the label is not. */
static private const exclusions:Array = ["labelDisplay"];
/**
* @private
*/
override public function get colorizeExclusions():Array {return exclusions;}
/**
* @private
*/
override protected function initializationComplete():void
{
useChromeColor = true;
super.initializationComplete();
}
/**
* @private
*/
override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number) : void
{
var cr:Number = getStyle("cornerRadius");
if (cornerRadius != cr)
{
cornerRadius = cr;
shadow.radiusX = cornerRadius;
fill.radiusX = cornerRadius;
lowlight.radiusX = cornerRadius;
highlight.radiusX = cornerRadius;
border.radiusX = cornerRadius;
}
if (highlightStroke) highlightStroke.radiusX = cornerRadius;
if (hldownstroke1) hldownstroke1.radiusX = cornerRadius;
if (hldownstroke2) hldownstroke2.radiusX = cornerRadius;
super.updateDisplayList(unscaledWidth, unscaledHeight);
}
private var cornerRadius:Number = 2;
]]>
</fx:Script>
<!-- states -->
<s:states>
<s:State name="up" />
<s:State name="over" />
<s:State name="down" />
<s:State name="disabled" />
</s:states>
<!-- layer 1: shadow -->
<!--- @private -->
<s:Rect id="shadow" left="-1" right="-1" top="-1" bottom="-1" radiusX="2">
<s:fill>
<s:LinearGradient rotation="90">
<s:GradientEntry color="0x000000"
color.down="0xFFFFFF"
alpha="0.01"
alpha.down="0" />
<s:GradientEntry color="0x000000"
color.down="0xFFFFFF"
alpha="0.07"
alpha.down="0.5" />
</s:LinearGradient>
</s:fill>
</s:Rect>
<!-- layer 2: fill -->
<!--- @private -->
<s:Rect id="fill" left="1" right="1" top="1" bottom="1" radiusX="2">
<s:fill>
<s:LinearGradient rotation="90">
<s:GradientEntry color="0xFFFFFF"
color.over="0xBBBDBD"
color.down="0xAAAAAA"
alpha="0.85" />
<s:GradientEntry color="0xD8D8D8"
color.over="0x9FA0A1"
color.down="0x929496"
alpha="0.85" />
</s:LinearGradient>
</s:fill>
</s:Rect>
 
<!-- layer 3: fill lowlight -->
<!--- @private -->
<s:Rect id="lowlight" left="1" right="1" top="1" bottom="1" radiusX="2">
<s:fill>
<s:LinearGradient rotation="270">
<s:GradientEntry color="0x000000" ratio="0.0" alpha="0.0627" />
<s:GradientEntry color="0x000000" ratio="0.48" alpha="0.0099" />
<s:GradientEntry color="0x000000" ratio="0.48001" alpha="0" />
</s:LinearGradient>
</s:fill>
</s:Rect>
<!-- layer 4: fill highlight -->
<!--- @private -->
<s:Rect id="highlight" left="1" right="1" top="1" bottom="1" radiusX="2">
<s:fill>
<s:LinearGradient rotation="90">
<s:GradientEntry color="0xFFFFFF"
ratio="0.0"
alpha="0.33"
alpha.over="0.22"
alpha.down="0.12"/>
<s:GradientEntry color="0xFFFFFF"
ratio="0.48"
alpha="0.33"
alpha.over="0.22"
alpha.down="0.12" />
<s:GradientEntry color="0xFFFFFF"
ratio="0.48001"
alpha="0" />
</s:LinearGradient>
</s:fill>
</s:Rect>
<!-- layer 5: highlight stroke (all states except down) -->
<!--- @private -->
<s:Rect id="highlightStroke" left="1" right="1" top="1" bottom="1" radiusX="2" excludeFrom="down">
<s:stroke>
<s:LinearGradientStroke rotation="90" weight="1">
<s:GradientEntry color="0xFFFFFF" alpha.over="0.22" />
<s:GradientEntry color="0xD8D8D8" alpha.over="0.22" />
</s:LinearGradientStroke>
</s:stroke>
</s:Rect>
<!-- layer 6: highlight stroke (down state only) -->
<!--- @private -->
<s:Rect id="hldownstroke1" left="1" right="1" top="1" bottom="1" radiusX="2" includeIn="down">
<s:stroke>
<s:LinearGradientStroke rotation="90" weight="1">
<s:GradientEntry color="0x000000" alpha="0.25" ratio="0.0" />
<s:GradientEntry color="0x000000" alpha="0.25" ratio="0.001" />
<s:GradientEntry color="0x000000" alpha="0.07" ratio="0.0011" />
<s:GradientEntry color="0x000000" alpha="0.07" ratio="0.965" />
<s:GradientEntry color="0x000000" alpha="0.00" ratio="0.9651" />
</s:LinearGradientStroke>
</s:stroke>
</s:Rect>
<!--- @private -->
<s:Rect id="hldownstroke2" left="2" right="2" top="2" bottom="2" radiusX="2" includeIn="down">
<s:stroke>
<s:LinearGradientStroke rotation="90" weight="1">
<s:GradientEntry color="0x000000" alpha="0.09" ratio="0.0" />
<s:GradientEntry color="0x000000" alpha="0.00" ratio="0.0001" />
</s:LinearGradientStroke>
</s:stroke>
</s:Rect>
 
<!-- layer 7: border - put on top of the fill so it doesn't disappear when scale is less than 1 -->
<!--- @private -->
<s:Rect id="border" left="0" right="0" top="0" bottom="0" width="69" height="20" radiusX="2">
<s:stroke>
<s:LinearGradientStroke rotation="90" weight="1">
<s:GradientEntry color="0x000000"
alpha="0.5625"
alpha.down="0.6375" />
<s:GradientEntry color="0x000000"
alpha="0.75"
alpha.down="0.85" />
</s:LinearGradientStroke>
</s:stroke>
</s:Rect>
<!-- layer 8: text and icon -->
<!--- @copy spark.components.supportClasses.ButtonBase#labelDisplay -->
<s:Group>
 
<s:layout>
<s:HorizontalLayout gap="1" verticalAlign="middle" paddingTop="3" paddingBottom="0" paddingLeft="10" paddingRight="10"/>
</s:layout>
<!-- the icon element will be set by the skin -->
<s:BitmapImage id="iconElement" width="16" height="16"/>
<s:Group height="100%">
<s:Label id="labelDisplay"
textAlign="center"
maxDisplayedLines="1"
horizontalCenter="-1" verticalCenter="1" verticalAlign="middle"
left="2" right="2" >
</s:Label>
</s:Group>
</s:Group>
</s:SparkButtonSkin>

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