Flex背景渐变及边框圆滑样式

flex除了application支持背景渐变色外，其它控制都不支持，近日需要这个功能，在网上搜到些资料整理如下：

 

类文件

GradientBorder.as

/**
 * 背景渐变色
 * whisht
 * */
package {
    
    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, 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, w, h, tr, tr, br, br);
            g.endFill();
                
        }
        
    }
}

 

 

调用示例

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" 
	layout="vertical" backgroundImage="" backgroundColor="white">
    
    <mx:Style>
        
        .gradient
        {
            border-style: solid;
            border-thickness: 0;
            border-skin: ClassReference("GradientBorder");
            fill-colors: #0099FF, #000099;
            corner-radius: 10;
            drop-shadow-enabled: true;
        }
        
    </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="gradient" 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:Application>