Flex Examples
The following example shows how you can create a custom thumb icon for the Spark HSlider control in Flex 4 by creating a new custom skin and setting the skinClass style.
The following example(s) require Flash Player 10 and the Adobe Flex 4 SDK. To download the Adobe Flash Builder 4 trial, see http://www.adobe.com/products/flex/. To download the latest nightly build of the Flex 4 SDK, see http://opensource.adobe.com/wiki/display/flexsdk/Download+Flex+4.
For more information on getting started with Flex 4 and Flash Builder 4, see the official Adobe Flex Team blog.
<?xml version="1.0" encoding="utf-8"?> <!-- http://blog.flexexamples.com/2009/03/10/setting-a-custom-thumb-skin-on-a-fxhslider-control-in-flex-gumbo/ --> <s:Application name="Spark_HSlider_skinClass_test" 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:layout> <s:BasicLayout /> </s:layout> <s:HSlider id="slider" skinClass="skins.CustomHSliderSkin" showDataTip="false" horizontalCenter="0" verticalCenter="0" /> </s:Application>
And the custom Spark HSlider control skin, skins/CustomHSliderSkin.mxml, is as follows:
<?xml version="1.0" encoding="utf-8"?> <!-- http://blog.flexexamples.com/2009/03/10/setting-a-custom-thumb-skin-on-a-fxhslider-control-in-flex-gumbo/ --> <s:SparkSkin name="CustomHSliderSkin" xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:fb="http://ns.adobe.com/flashbuilder/2009" minHeight="11" alpha.disabled="0.5"> <!-- states --> <s:states> <s:State name="normal" /> <s:State name="disabled" /> </s:states> <fx:Metadata> [HostComponent("spark.components.HSlider")] </fx:Metadata> <fx:Script fb:purpose="styling"> <![CDATA[ /* 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"]; override public function get colorizeExclusions():Array { return exclusions; } override protected function initializationComplete():void { useChromeColor = true; super.initializationComplete(); } ]]> </fx:Script> <fx:Script> <![CDATA[ override protected function measure():void { // Temporarily move the thumb to the left of the Slider so measurement // doesn't factor in its x position. This allows resizing the // HSlider to less than 100px in width. var thumbPos:Number = thumb.getLayoutBoundsX(); thumb.setLayoutBoundsPosition(0, thumb.getLayoutBoundsY()); super.measure(); thumb.setLayoutBoundsPosition(thumbPos, thumb.getLayoutBoundsY()); } ]]> </fx:Script> <fx:Declarations> <!--- The tooltip used in the mx.controls.Slider control. To customize the DataTip's appearance, create a custom HSliderSkin class.--> <fx:Component id="dataTip"> <s:DataRenderer minHeight="24" minWidth="40" y="-34"> <s:Rect top="0" left="0" right="0" bottom="0"> <s:fill> <s:SolidColor color="0x000000" alpha="0.9"/> </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 HSliderTrackSkin. --> <s:Button id="track" left="0" right="0" top="0" bottom="0" minWidth="33" width="100" skinClass="spark.skins.spark.HSliderTrackSkin" /> <!--- The default skin class is HSliderThumbSkin. --> <s:Button id="thumb" top="0" bottom="0" skinClass="skins.CustomHSliderThumbSkin" /> </s:SparkSkin>
Finally, the custom HSlider thumb skin, skins/CustomHSliderThumbSkin.mxml, is as follows:
<?xml version="1.0" encoding="utf-8"?> <!-- http://blog.flexexamples.com/2009/03/10/setting-a-custom-thumb-skin-on-a-fxhslider-control-in-flex-gumbo/ --> <s:SparkSkin name="CustomHSliderThumbSkin" xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:fb="http://ns.adobe.com/flashbuilder/2009"> <!-- states --> <s:states> <s:State name="up" /> <s:State name="over" /> <s:State name="down" /> <s:State name="disabled" /> </s:states> <fx:Metadata> [HostComponent("spark.components.Button")] </fx:Metadata> <fx:Script fb:purpose="styling"> <![CDATA[ override protected function initializationComplete():void { useChromeColor = true; super.initializationComplete(); } ]]> </fx:Script> <s:BitmapImage source="@Embed('assets/asterisk_yellow.png')" x="0" y="-4" /> </s:SparkSkin>
View source is enabled in the following example.
Icons copyright of famfamfam.com.
You can also set the skinClass style in an external .CSS file or <Style/> block, as seen in the following example:
<?xml version="1.0" encoding="utf-8"?> <!-- http://blog.flexexamples.com/2009/03/10/setting-a-custom-thumb-skin-on-a-fxhslider-control-in-flex-gumbo/ --> <s:Application name="Spark_HSlider_skinClass_test" 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:layout> <s:BasicLayout /> </s:layout> <fx:Style> @namespace s "library://ns.adobe.com/flex/spark"; @namespace mx "library://ns.adobe.com/flex/mx"; s|HSlider { skinClass: ClassReference("skins.CustomHSliderSkin"); } </fx:Style> <s:HSlider id="slider" showDataTip="false" horizontalCenter="0" verticalCenter="0" /> </s:Application>
Or, you can set the skinClass style using ActionScript, as seen in the following example:
<?xml version="1.0" encoding="utf-8"?> <!-- http://blog.flexexamples.com/2009/03/10/setting-a-custom-thumb-skin-on-a-fxhslider-control-in-flex-gumbo/ --> <s:Application name="Spark_HSlider_skinClass_test" 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:layout> <s:BasicLayout /> </s:layout> <fx:Script> <![CDATA[ import skins.CustomHSliderSkin; protected function init():void { slider.setStyle("skinClass", CustomHSliderSkin); } ]]> </fx:Script> <s:HSlider id="slider" showDataTip="false" horizontalCenter="0" verticalCenter="0" creationComplete="init();"/> </s:Application>
This entry is based on a beta version of the Flex 4 SDK and therefore is very likely to change as development of the Flex SDK continues. The API can (and will) change causing examples to possibly not compile in newer versions of the Flex 4 SDK.
Peter deHaan
Peter deHaan currently works for Adobe on the Flex SDK QA team. While not working on Flex, Flash, and ColdFusion applications, Peter enjoys making up bios and writing in 3rd person. Peter's rarely updated blog can be found at blogs.adobe.com/pdehaan/, actionscriptexamples.com, airexamples.com, and coldfusionexamples.com.
Share
