Flex：Flex 给容器设置背景渐变(mx)

受到@大猫1977 新浪微博客户端的启发，终于可以把组件的背景色渐变一把了，下面看看样式是这样实现的吧。代码内容来自互联网，经稍微修改。

GradientBorder.as

/** * 背景渐变色 * whisht * */ package Script{ import flash.display.*; import flash.geom.*; import flash.utils.*; import mx.core.EdgeMetrics; import mx.skins.halo.HaloBorder; import mx.utils.ColorUtil; import mx.utils.GraphicsUtil; public class GradientBorder extends HaloBorder { private var topCornerRadius:Number; // top corner radius private var bottomCornerRadius:Number; // bottom corner radius private var fillColors:Array; // fill colors (two) private var setup:Boolean; private function setupStyles():void { fillColors = getStyle("fillColors") as Array; if (!fillColors) fillColors = [0xFFFFFF,0xFFFFFF]; topCornerRadius = getStyle("cornerRadius") as Number; if (!topCornerRadius) topCornerRadius = 0; bottomCornerRadius = getStyle("bottomCornerRadius") as Number; if (!bottomCornerRadius) bottomCornerRadius = topCornerRadius; } override protected function updateDisplayList(unscaledWidth:Number,unscaledHeight:Number):void { super.updateDisplayList(unscaledWidth,unscaledHeight); setupStyles(); var g:Graphics = graphics; var b:EdgeMetrics = borderMetrics; var w:Number = unscaledWidth - b.left - b.right; var h:Number = unscaledHeight - b.top - b.bottom; var m:Matrix = verticalGradientMatrix(0,w,h); g.beginGradientFill("linear",fillColors,[1,1],[0,255],m); var tr:Number = Math.max(topCornerRadius-2,0); var br:Number = Math.max(bottomCornerRadius-2,0); GraphicsUtil.drawRoundRectComplex(g,b.left,b.top,h,tr,br,br); g.endFill(); } } }?

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Main.mxml

<?xml version="1.0" encoding="utf-8"?> <mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical" backgroundColor="#ffffff"> <mx:Style> .box { border-style: solid; border-thickness: 1; border-skin:ClassReference("Script.GradientBorder"); fill-colors: #483D8B,#cd0002; corner-radius: 10; drop-shadow-enabled: false; borderColor: #868397; borderAlpha: 0.99; roundedBottomCorners: true; cornerRadius: 0; <!--shadowDistance: 2; shadowDirection: left;--> } </mx:Style> <mx:Script> <!--[CDATA[ private function changeStyle():void { box.setStyle("fillColors",[col1.value,col2.value]); box.setStyle("cornerRadius",corner.value); } ]]--> </mx:Script> <mx:VBox id="box" styleName="box" width="400" height="300" verticalAlign="middle" horizontalAlign="center"> <mx:FormItem label="Color 1:"> <mx:ColorPicker id="col1" change="changeStyle()" selectedColor="0x0099FF"/> </mx:FormItem> <mx:FormItem label="Color 2:"> <mx:ColorPicker id="col2" change="changeStyle()" selectedColor="0x000099"/> </mx:FormItem> <mx:FormItem label="Corner radius:"> <mx:HSlider id="corner" value="10" minimum="0" maximum="100" change="changeStyle()"/> </mx:FormItem> </mx:VBox> </mx:WindowedApplication> ?

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截图：

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转摘请注明出处，谢谢！

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原出处：http://www.cnblogs.com/sinbad/archive/2011/06/03/2072301.html