Flex4 自定义RadioButton的Skin

Radiobutton自带的皮肤中，圈太小，不方便用户点击，需要自定义皮肤，google了N久，找到前面两篇资料，然后自己重新写了一个Skin，终于搞定了，哈哈哈~

我的SkinRadio.mxml的源码：

<?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 a Spark RadioButton component.  

       @see spark.components.RadioButton
       @see spark.components.RadioButtonGroup
        
      @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.disabledStates="0.5">

    <fx:Metadata>
    <![CDATA[ 
        /** 
         * @copy spark.skins.spark.ApplicationSkin#hostComponent
         */
        [HostComponent("spark.components.RadioButton")]
    ]]>
    </fx:Metadata> 
    
    <fx:Script fb:purpose="styling">
        /* 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", "dot"];

        /**
         * @private
         */
        override public function get colorizeExclusions():Array {return exclusions;}
        
        /* Define the symbol fill items that should be colored by the "symbolColor" style. */
        static private const symbols:Array = ["dotFill"];
        
        /**
         * @private
         */
        override public function get symbolItems():Array {return symbols};
        
        /**
         * @private
         */
        override protected function initializationComplete():void
        {
            useChromeColor = true;
            super.initializationComplete();
        }
    </fx:Script>
    
    <fx:Script>
        <![CDATA[
        /** 
         * @private 
         */     
        private static const focusExclusions:Array = ["labelDisplay"];

        /**
         *  @private
         */
        override public function get focusSkinExclusions():Array { return focusExclusions;};
        ]]>
    </fx:Script>
    
    <s:states>
        <s:State name="up" />
        <s:State name="over" stateGroups="overStates" />
        <s:State name="down" stateGroups="downStates" />
        <s:State name="disabled" stateGroups="disabledStates" />
        <s:State name="upAndSelected" stateGroups="selectedStates" />
        <s:State name="overAndSelected" stateGroups="overStates, selectedStates" />
        <s:State name="downAndSelected" stateGroups="downStates, selectedStates" />
        <s:State name="disabledAndSelected" stateGroups="disabledStates, selectedStates" />
    </s:states>
    
    <s:Group verticalCenter="0" width="25" height="25">
        <!-- drop shadow -->
        <s:Ellipse left="0" top="0" right="-1" bottom="-1">
            <s:stroke>
                <s:LinearGradientStroke rotation="90" weight="1">
                    <s:GradientEntry color="0x000000" 
                                   color.downStates="0x00FF00"
                                   alpha="0.011"
                                   alpha.downStates="0" />
                    <s:GradientEntry color="0x000000" 
                                   color.downStates="0xFFFFFF" 
                                   alpha="0.121"
                                   alpha.downStates="0.57" />
                </s:LinearGradientStroke>
            </s:stroke>
        </s:Ellipse>
        
        <!-- fill -->
        <s:Ellipse left="1" top="1" right="1" bottom="1">
            <s:fill>
                <s:LinearGradient rotation="90">
                    <s:GradientEntry color="0xFFFFFF" 
                                   color.overStates="0xBBBDBD" 
                                   color.downStates="0xAAAAAA" 
                                   alpha="0.85" />
                    <s:GradientEntry color="0xD8D8D8" 
                                   color.overStates="0x9FA0A1" 
                                   color.downStates="0x929496" 
                                   alpha="0.85" />
                </s:LinearGradient>
            </s:fill>
        </s:Ellipse>
        
        <!-- fill highlight -->
        <s:Path data="M 1 6 Q 2 2 6 1 Q 11 2 12 6 h -9">
            <s:fill>
                <s:SolidColor color="0xEEEEEE" alpha="0.33" />
            </s:fill>
        </s:Path>
        
        <!-- layer 6: highlight stroke (all states except down) -->
        <s:Ellipse left="1" right="1" top="1" bottom="1">
            <s:stroke>
                <s:LinearGradientStroke rotation="90" weight="1">
                    <s:GradientEntry color="0xFFFFFF" color.downStates="0x939393" alpha.overStates="0.22" />
                    <s:GradientEntry color="0xD8D8D8" color.downStates="0xB1B1B1" alpha.overStates="0.22" />
                </s:LinearGradientStroke>
            </s:stroke>
        </s:Ellipse>
        <s:Rect left="5" top="1" right="5" height="1">
            <s:fill>
                <s:SolidColor color="0xEEEEEE" 
                            color.downStates="0x939393"
                            alpha.overStates="0.22" />
            </s:fill>
        </s:Rect>
        
        <!-- border - put on top of the fill so it doesn't disappear when scale is less than 1 -->
        <s:Ellipse left="0" top="0" right="0" bottom="0">
            <s:stroke>
                <s:LinearGradientStroke rotation="90" weight="1">
                    <s:GradientEntry color="0x000000" alpha="0.70" />
                    <s:GradientEntry color="0x000000" alpha="0.80" />
                </s:LinearGradientStroke>
            </s:stroke>
        </s:Ellipse>
        
        <!-- dot -->
        <!--- Defines the appearance of the RadioButton's dot. To customize the appearance of the dot, create a custom RadioButtonSkin class. -->
        <s:Path left="2" top="2" includeIn="selectedStates" id="dot" itemCreationPolicy="deferred"
                data="M 2 13 C 2 7 7 2 13 2 C 18 2 23 7 23 13 C 23 18 18 23 13 23 C 7 23 2 18 2 13 Z ">
            <s:fill>
                <!--- @private
                Defines the appearance of the dot's fill. The default color is 0x000000. The default alpha is .9. -->
                <s:SolidColor id="dotFill" color="0x02881e" alpha="0.9" />
                
            </s:fill>
            
        </s:Path>
        
    </s:Group>

    <!-- Label -->
    <!---  @copy spark.components.supportClasses.ButtonBase#labelDisplay -->
    <s:Label id="labelDisplay"
             textAlign="start"
             verticalAlign="middle"
             maxDisplayedLines="1"
             left="40" right="0" top="3" bottom="3" verticalCenter="2" />

</s:SparkSkin>

看下效果：