EUI ToggleButton ToggleSwitch 实现类似音乐开关按钮

export class ToggleSwitch extends ToggleButton {
        /**
         * @language en_US
         * Constructor.
         *
         * @version Egret 2.4
         * @version eui 1.0
         * @platform Web,Native
         */
        /**
         * @language zh_CN
         * 构造函数。
         *
         * @version Egret 2.4
         * @version eui 1.0
         * @platform Web,Native
         */
        public constructor() {
            super();

        }
    }

<?xml version="1.0" encoding="utf-8"?>
<e:Skin class="skins.ToggleSwitchSkin" states="up,down,disabled,upAndSelected,downAndSelected,disabledAndSelected" xmlns:e="http://ns.egret.com/eui">
    <e:Image source="on_png"
             source.up="off_png"
             source.down="off_png"
             source.disabled="off_png"/>
    <e:Image source="handle_png"
             horizontalCenter="-18"
             horizontalCenter.upAndSelected="18"
             horizontalCenter.downAndSelected="18"
             horizontalCenter.disabledAndSelected="18"
             verticalCenter="0"/>
</e:Skin>