How to make the background of a Flex button transparent
3 answers
The easiest way is to use mx:LinkButton
unfortunately LinkButtonSkin
hardcoded alpha = 1 for all states, but you can override it:
package
{
import flash.geom.Matrix;
import mx.skins.halo.LinkButtonSkin;
public class LinkButtonAlphaSkin extends LinkButtonSkin
{
public function LinkButtonAlphaSkin()
{
super();
}
override protected function drawRoundRect(x:Number, y:Number, width:Number, height:Number, cornerRadius:Object=null, color:Object=null, alpha:Object=null, gradientMatrix:Matrix=null, gradientType:String="linear", gradientRatios:Array=null, hole:Object=null):void
{
super.drawRoundRect(x, y, width, height, cornerRadius, color, 0, gradientMatrix, gradientType, gradientRatios, hole);
}
}
}
Using:
<mx:LinkButton label="lala" skin="LinkButtonAlphaSkin"/>
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When using the Spark button, you can apply a custom skin that does not contain chrome.
You can apply custom skin like this:
<s:Button label="Submit" skinClass="TransparentButtonSkin"/>
@Panciz will probably work, but the skin can be made much easier by simply leaving all the components you don't need.
<!--TransparentButtonSkin.mxml-->
<s:SparkButtonSkin xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
alpha.disabled="0.5">
<fx:Metadata>
[HostComponent("spark.components.Button")]
</fx:Metadata>
<s:states>
<s:State name="up"/>
<s:State name="over"/>
<s:State name="down"/>
<s:State name="disabled"/>
</s:states>
<s:Rect id="hitZone" left="0" right="0" top="0" bottom="0">
<s:fill>
<s:SolidColor alpha="0"/>
</s:fill>
</s:Rect>
<s:Label id="labelDisplay" left="0" right="0" top="0" bottom="0"
horizontalCenter="0" verticalCenter="0"
textAlign="center" maxDisplayedLines="1" verticalAlign="middle"/>
</s:SparkButtonSkin>
Note the hitzone
transparent graphics: this is necessary because otherwise you would click on the transparent section of the button.
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You have to define a new Skinclass and define an alpha property for the whole component, I tried using the spark button and it worked.
<?xml version="1.0" encoding="utf-8"?>
<!--
ADOBE SYSTEMS INCORPORATED
Copyright 2008 Adobe Systems Incorporated
All Rights Reserved.
NOTICE: Adobe permits you to use, modify, and distribute this file
in accordance with the terms of the license agreement accompanying it.
-->
<!--- The default skin class for the Spark Button component.
@see spark.components.Button
@langversion 3.0
@playerversion Flash 10
@playerversion AIR 1.5
@productversion Flex 4
-->
<s:SparkButtonSkin xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:fb="http://ns.adobe.com/flashbuilder/2009"
minWidth="21" minHeight="21"
alpha.disabled="0.5">
<fx:Metadata>
<![CDATA[
/**
* @copy spark.skins.spark.ApplicationSkin#hostComponent
*/
[HostComponent("spark.components.Button")]
]]>
</fx:Metadata>
<fx:Script fb:purpose="styling">
<![CDATA[
import spark.components.Group;
/* Define the skin elements that should not be colorized.
For button, the graphics are colorized but the label is not. */
static private const exclusions:Array = ["labelDisplay"];
/**
* @private
*/
override public function get colorizeExclusions():Array {return exclusions;}
/**
* @private
*/
override protected function initializationComplete():void
{
useChromeColor = true;
super.initializationComplete();
}
/**
* @private
*/
override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number) : void
{
var cr:Number = getStyle("cornerRadius");
if (cornerRadius != cr)
{
cornerRadius = cr;
shadow.radiusX = cornerRadius;
fill.radiusX = cornerRadius;
lowlight.radiusX = cornerRadius;
highlight.radiusX = cornerRadius;
border.radiusX = cornerRadius;
}
if (highlightStroke) highlightStroke.radiusX = cornerRadius;
if (hldownstroke1) hldownstroke1.radiusX = cornerRadius;
if (hldownstroke2) hldownstroke2.radiusX = cornerRadius;
super.updateDisplayList(unscaledWidth, unscaledHeight);
}
private var cornerRadius:Number = 2;
]]>
</fx:Script>
<!-- states -->
<s:states>
<s:State name="up" />
<s:State name="over" />
<s:State name="down" />
<s:State name="disabled" />
</s:states>
<!-- layer 1: shadow -->
<!--- @private -->
<s:Rect id="shadow" left="-1" right="-1" top="-1" bottom="-1" radiusX="2">
<s:fill>
<s:LinearGradient rotation="90">
<s:GradientEntry color="0x000000"
color.down="0xFFFFFF"
alpha="0.01"
alpha.down="0" />
<s:GradientEntry color="0x000000"
color.down="0xFFFFFF"
alpha="0.07"
alpha.down="0.5" />
</s:LinearGradient>
</s:fill>
</s:Rect>
<!-- layer 2: fill -->
<!--- @private -->
<s:Rect id="fill" alpha="{0.1}" left="1" right="1" top="1" bottom="1" radiusX="2">
<s:fill>
<s:LinearGradient rotation="90">
<s:GradientEntry color="0xFFFFFF"
color.over="0xBBBDBD"
color.down="0xAAAAAA"
alpha="0.85" />
<s:GradientEntry color="0xD8D8D8"
color.over="0x9FA0A1"
color.down="0x929496"
alpha="0.85" />
</s:LinearGradient>
</s:fill>
</s:Rect>
<!-- layer 3: fill lowlight -->
<!--- @private -->
<s:Rect id="lowlight" alpha="{0.1}" left="1" right="1" top="1" bottom="1" radiusX="2">
<s:fill>
<s:LinearGradient rotation="270">
<s:GradientEntry color="0x000000" ratio="0.0" alpha="0.0627" />
<s:GradientEntry color="0x000000" ratio="0.48" alpha="0.0099" />
<s:GradientEntry color="0x000000" ratio="0.48001" alpha="0" />
</s:LinearGradient>
</s:fill>
</s:Rect>
<!-- layer 4: fill highlight -->
<!--- @private -->
<s:Rect id="highlight" alpha="{0.1}" left="1" right="1" top="1" bottom="1" radiusX="2">
<s:fill>
<s:LinearGradient rotation="90">
<s:GradientEntry color="0xFFFFFF"
ratio="0.0"
alpha="0.33"
alpha.over="0.22"
alpha.down="0.12"/>
<s:GradientEntry color="0xFFFFFF"
ratio="0.48"
alpha="0.33"
alpha.over="0.22"
alpha.down="0.12" />
<s:GradientEntry color="0xFFFFFF"
ratio="0.48001"
alpha="0" />
</s:LinearGradient>
</s:fill>
</s:Rect>
<!-- layer 5: highlight stroke (all states except down) -->
<!--- @private -->
<s:Rect id="highlightStroke" alpha="{0.1}" left="1" right="1" top="1" bottom="1" radiusX="2" excludeFrom="down">
<s:stroke>
<s:LinearGradientStroke rotation="90" weight="1">
<s:GradientEntry color="0xFFFFFF" alpha.over="0.22" />
<s:GradientEntry color="0xD8D8D8" alpha.over="0.22" />
</s:LinearGradientStroke>
</s:stroke>
</s:Rect>
<!-- layer 6: highlight stroke (down state only) -->
<!--- @private -->
<s:Rect id="hldownstroke1" alpha="{0.1}" left="1" right="1" top="1" bottom="1" radiusX="2" includeIn="down">
<s:stroke>
<s:LinearGradientStroke rotation="90" weight="1">
<s:GradientEntry color="0x000000" alpha="0.25" ratio="0.0" />
<s:GradientEntry color="0x000000" alpha="0.25" ratio="0.001" />
<s:GradientEntry color="0x000000" alpha="0.07" ratio="0.0011" />
<s:GradientEntry color="0x000000" alpha="0.07" ratio="0.965" />
<s:GradientEntry color="0x000000" alpha="0.00" ratio="0.9651" />
</s:LinearGradientStroke>
</s:stroke>
</s:Rect>
<!--- @private -->
<s:Rect id="hldownstroke2" alpha="{0.1}" left="2" right="2" top="2" bottom="2" radiusX="2" includeIn="down">
<s:stroke>
<s:LinearGradientStroke rotation="90" weight="1">
<s:GradientEntry color="0x000000" alpha="0.09" ratio="0.0" />
<s:GradientEntry color="0x000000" alpha="0.00" ratio="0.0001" />
</s:LinearGradientStroke>
</s:stroke>
</s:Rect>
<!-- layer 7: border - put on top of the fill so it doesn't disappear when scale is less than 1 -->
<!--- @private -->
<s:Rect id="border" alpha="{0.1}" left="0" right="0" top="0" bottom="0" width="69" height="20" radiusX="2">
<s:stroke>
<s:LinearGradientStroke rotation="90" weight="1">
<s:GradientEntry color="0x000000"
alpha="0.5625"
alpha.down="0.6375" />
<s:GradientEntry color="0x000000"
alpha="0.75"
alpha.down="0.85" />
</s:LinearGradientStroke>
</s:stroke>
</s:Rect>
<!-- layer 8: text -->
<!--- @copy spark.components.supportClasses.ButtonBase#labelDisplay -->
<s:Label id="labelDisplay"
textAlign="center"
maxDisplayedLines="1"
horizontalCenter="0" verticalCenter="1" verticalAlign="middle"
left="10" right="10" top="2" bottom="2">
</s:Label>
</s:SparkButtonSkin>
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