Flex中的CSS：（三）CSS会被编译器转换为什么样的AS代码-伪类：s|Button:up

Flex中的CSS：（3）CSS会被编译器转换为什么样的AS代码--伪类：s|Button:up

熟悉html和css的朋友们都知道，伪类是用来设置组件在不同状态下的样式。

test1.mxml

&lt;?xml version="1.0" encoding="utf-8"?&gt;&lt;s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"   xmlns:s="library://ns.adobe.com/flex/spark"   xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"&gt;&lt;fx:Style&gt;@namespace s "library://ns.adobe.com/flex/spark";@namespace mx "library://ns.adobe.com/flex/mx";s|Button:up{color: #FF0000;}s|Button:down{color: #FF00FF;}s|Button:over{color: #0000FF;}&lt;/fx:Style&gt;&lt;s:VGroup&gt;&lt;s:Button label="button"/&gt;&lt;/s:VGroup&gt;&lt;/s:Application&gt;

执行结果：

鼠标在按钮上移入、移出、按下、弹开，看看有什么变化。

Flex中的CSS：（三）CSS会被编译器转换为什么样的AS代码-伪类：s|Button:up

编译器自动生成代码：

        var conditions:Array;        var condition:CSSCondition;        var selector:CSSSelector;        selector = null;        conditions = null;        conditions = [];        condition = new CSSCondition("pseudo", "up");        conditions.push(condition);         selector = new CSSSelector("spark.components.Button", conditions, selector);        // spark.components.Button:up        style = styleManager.getStyleDeclaration("spark.components.Button:up");        if (!style)        {            style = new CSSStyleDeclaration(selector, styleManager);        }        if (style.factory == null)        {            style.factory = function():void            {                this.color = 0xff0000;            };        }        selector = null;        conditions = null;        conditions = [];        condition = new CSSCondition("pseudo", "down");        conditions.push(condition);         selector = new CSSSelector("spark.components.Button", conditions, selector);        // spark.components.Button:down        style = styleManager.getStyleDeclaration("spark.components.Button:down");        if (!style)        {            style = new CSSStyleDeclaration(selector, styleManager);        }        if (style.factory == null)        {            style.factory = function():void            {                this.color = 0xff00ff;            };        }        selector = null;        conditions = null;        conditions = [];        condition = new CSSCondition("pseudo", "over");        conditions.push(condition);         selector = new CSSSelector("spark.components.Button", conditions, selector);        // spark.components.Button:over        style = styleManager.getStyleDeclaration("spark.components.Button:over");        if (!style)        {            style = new CSSStyleDeclaration(selector, styleManager);        }        if (style.factory == null)        {            style.factory = function():void            {                this.color = 0x0000ff;            };        }

可见，每种状态都被转换为独立的AS代码。

Flex中的CSS： （三）CSS会被编译器转

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Flex中的CSS：（三）CSS会被编译器转