在覆盖updateDisplayList方法中使用 图标的经典写法
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package com.ztesoft.zsmart.corelib.skins{import flash.display.Graphics;import mx.core.mx_internal;import mx.skins.ProgrammaticSkin;/** * The skin for all the states of the icon in a PopUpButton * */public class PopUpIconSkin extends ProgrammaticSkin{ //-------------------------------------- // // Constructor // //-------------------------------------- /** * Constructor */ public function PopUpIconSkin() { super(); } //-------------------------------------- // // Variables // //-------------------------------------- /** * @private */ mx_internal var arrowColor:uint = 0x111111; //-------------------------------------- // // Overridden properties // //-------------------------------------- //----------------------------------// measuredWidth //---------------------------------- /** * @private */ override public function get measuredWidth():Number { return 7; } //----------------------------------// measuredHeight //---------------------------------- /** * @private */ override public function get measuredHeight():Number { return 5; } //-------------------------------------- // // Overridden methods // //-------------------------------------- /** * @private */ override protected function updateDisplayList(w:Number, h:Number):void {super.updateDisplayList(w, h); var g:Graphics = graphics; g.clear(); g.beginFill(mx_internal::arrowColor); g.moveTo(w / 2, height); g.lineTo(0, 0); g.lineTo(w, 0); g.lineTo(w / 2, h); g.endFill(); }}}??