Style a Spark Component with an Image - actionscript-3

Question

I'm trying to use an image (embedded) for the thumb on my Spark slider component. This should be straightforward -- I know what to do in mx -- but I haven't been able to find what the Spark syntax is.
I don't even need states (up, down, over, etc) since this is going on a mobile app.
Does anyone know?
Thanks.

Answer 1

Your Spark Slider requires a custom skin class, and that skin requires a SliderThumbSkin for the thumb.
Spark Slider:
<?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">
<s:VSlider skinClass="SliderSkin" />
</s:Application>
SliderSkin - Spark Slider's skin class requires a thumb skin:
<!--- The default skin class is VSliderThumbSkin.
#copy spark.components.supportClasses.TrackBase#thumb
#see spark.skins.spark.VSliderThumbSkin -->
<s:Button id="thumb" left="0" right="0" width="11" height="11"
tabEnabled="false"
skinClass="SliderThumbSkin" />
This is the only change to the VSliderSkin. If you need the entire skin code, it is below in the Additional Information section of this answer.
SliderThumbSkin - Thumb skin's button thumb requires skin for images:
<?xml version="1.0" encoding="utf-8"?>
<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>
<!-- states -->
<s:states>
<s:State name="up" />
<s:State name="over" />
<s:State name="down" />
<s:State name="disabled" />
</s:states>
<s:Image source.up="https://www.google.com/intl/en_com/images/srpr/logo3w.png"
source.over="https://www.google.com/intl/en_com/images/srpr/logo3w.png"
source.down="https://www.google.com/intl/en_com/images/srpr/logo3w.png"
source.disabled="https://www.google.com/intl/en_com/images/srpr/logo3w.png"
width="20"
height="20" />
</s:SparkButtonSkin>
Here, I've replaced the thumb with the Google logo:
Additional Information
These skins can be auto-generated using Flash Builder's content assist by [CTRL/COMMAND+SPACE] inside the quotes of skinClass="" appearing as such:
This will bring up a dialog to create a new MXML skin:
Default skins are in the SDK by theme. For Spark it'd be something like:
C:\Program Files (x86)\Adobe\Adobe Flash Builder 4.5\sdks\4.5.1\frameworks\projects\spark\src\spark\skins\spark
Here is the entire SliderSkin class
<?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 VSlider component. The thumb and track skins are defined by the
VSliderThumbSkin and VSliderTrackSkin classes, respectively.
#see spark.components.VSlider
#see spark.skins.spark.VSliderThumbSkin
#see spark.skins.spark.VSliderTrackSkin
#langversion 3.0
#playerversion Flash 10
#playerversion AIR 1.5
#productversion Flex 4
-->
<s:SparkSkin 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="11" alpha.disabled="0.5">
<fx:Metadata>
<![CDATA[
/**
* #copy spark.skins.spark.ApplicationSkin#hostComponent
*/
[HostComponent("spark.components.VSlider")]
]]>
</fx:Metadata>
<fx:Script fb:purpose="styling">
/* Define the skin elements that should not be colorized.
For slider, the skin itself is colorized but the individual parts are not. */
static private const exclusions:Array = ["track", "thumb"];
/**
* #private
*/
override public function get colorizeExclusions():Array {return exclusions;}
/**
* #private
*/
override protected function initializationComplete():void
{
useChromeColor = true;
super.initializationComplete();
}
</fx:Script>
<fx:Script>
/**
* #private
*/
override protected function measure() : void
{
// Temporarily move the thumb to the top of the Slider so measurement
// doesn't factor in its y position. This allows resizing the
// VSlider to less than 100px in height.
var thumbPos:Number = thumb.getLayoutBoundsY();
thumb.setLayoutBoundsPosition(thumb.getLayoutBoundsX(), 0);
super.measure();
thumb.setLayoutBoundsPosition(thumb.getLayoutBoundsX(), thumbPos);
}
</fx:Script>
<s:states>
<s:State name="normal" />
<s:State name="disabled" />
</s:states>
<fx:Declarations>
<!--- The tooltip used in the mx.controls.Slider control.
To customize the DataTip's appearance, create a custom VSliderSkin class. -->
<fx:Component id="dataTip">
<s:DataRenderer minHeight="24" minWidth="40" x="20">
<s:Rect top="0" left="0" right="0" bottom="0">
<s:fill>
<s:SolidColor color="0x000000" alpha=".9"/>
</s:fill>
<s:filters>
<s:DropShadowFilter angle="90" color="0x999999" distance="3"/>
</s:filters>
</s:Rect>
<s:Label id="labelDisplay" text="{data}"
horizontalCenter="0" verticalCenter="1"
left="5" right="5" top="5" bottom="5"
textAlign="center" verticalAlign="middle"
fontWeight="normal" color="white" fontSize="11">
</s:Label>
</s:DataRenderer>
</fx:Component>
</fx:Declarations>
<!--- The default skin class is VSliderTrackSkin.
#copy spark.components.supportClasses.TrackBase#track
#see spark.skins.spark.VSliderTrackSkin -->
<s:Button id="track" left="0" right="0" top="0" bottom="0" minHeight="33" height="100"
tabEnabled="false"
skinClass="spark.skins.spark.VSliderTrackSkin" />
<!--- The default skin class is VSliderThumbSkin.
#copy spark.components.supportClasses.TrackBase#thumb
#see spark.skins.spark.VSliderThumbSkin -->
<s:Button id="thumb" left="0" right="0" width="11" height="11"
tabEnabled="false"
skinClass="SliderThumbSkin" />
</s:SparkSkin>