Flex中的CSS： （3）CSS会被编译器转换为什么样的AS代码--全局选

顾名思义。

test1.mxml

<?xml version="1.0" encoding="utf-8"?>
<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">
	<fx:Style>
		@namespace s "library://ns.adobe.com/flex/spark";
		@namespace mx "library://ns.adobe.com/flex/mx";
		global{
			color: #FF0000;
		}
	</fx:Style>
	<s:VGroup>
		<s:HGroup verticalAlign="middle">
			<s:Label text="Text Input 1"/>
			<s:TextInput text="sample"/>
		</s:HGroup>
		<s:TextInput text="sample"/>
	</s:VGroup>
</s:Application>

执行结果：

编译器自动生成代码：

test1-generated.as

        var conditions:Array;
        var condition:CSSCondition;
        var selector:CSSSelector;
        selector = null;
        conditions = null;
        conditions = null;
        selector = new CSSSelector("global",conditions,selector);
        // global
        style = styleManager.getStyleDeclaration("global");
        if (!style)
        {
            style = new CSSStyleDeclaration(selector,styleManager);
        }

        if (style.factory == null)
        {
            style.factory = function():void
            {
                this.color = 0xff0000;
            };
        }

我们发现，编译器自动生成的_test1_Styles.as中，也有同样"global"标识的代码，相同标识的代码将按照某种规则相互覆盖。这是后话。

_test1_Styles.as的摘录：

        //
        // global
        //
        selector = null;
        conditions = null;
        conditions = null;
        selector = new CSSSelector("global",selector);
        mergedStyle = styleManager.getMergedStyleDeclaration("global");
        style = new CSSStyleDeclaration(selector,styleManager,mergedStyle == null);

        if (style.defaultFactory == null)
        {
            style.defaultFactory = function():void
            {
                this.lineHeight = "120%";
                this.unfocusedTextSelectionColor = 0xe8e8e8;
                this.kerning = "default";
                this.caretColor = 0x0167ff;
                this.iconColor = 0x222221;
                this.verticalScrollPolicy = "auto";
                this.horizontalAlign = "left";
                this.filled = true;
                this.showErrorTip = true;
                this.textDecoration = "none";
                this.columnCount = "auto";
                this.liveDragging = true;
                this.dominantBaseline = "auto";
                this.fontThickness = 0;