Creating a custom track highlight skin on an MX HSlider control in Flex 4

The following example shows how you can create a custom track highlight skin on an MX HSlider control in Flex 4 by setting the trackHighlightSkin style and the Boolean showTrackHighlight style.

The following example(s) require Flash Player 10 and the Adobe Flex 4 SDK. To download the Adobe Flash Builder 4 trial, see www.adobe.com/products/flex/. To download the latest nightly build of the Flex 4 SDK, see 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/2010/04/14/creating-a-custom-track-highlight-skin-on-an-mx-hslider-control-in-flex-4/ -->
<s:Application name="MX_HSlider_trackHighlightSkin_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:controlBarContent>
        <s:CheckBox id="chckBx"
                label="showTrackHighlight"
                selected="true" />
    </s:controlBarContent>
 
    <mx:HSlider id="hSl"
            value="5"
            trackHighlightSkin="skins.CustomSliderTrackHighlightSkin"
            showTrackHighlight="{chckBx.selected}"
            horizontalCenter="0" verticalCenter="0" />
 
</s:Application>

[HaloSparkSkins]

And the custom MX HSlider track highlight skin, skins/CustomSliderTrackHighlightSkin.mxml, is as follows:

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2010/04/14/creating-a-custom-track-highlight-skin-on-an-mx-hslider-control-in-flex-4/ -->
<s:Skin name="CustomSkiderTrackHightlightSkin"
        xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark" 
        width="200" height="11"
        disabledAlpha="0.5">
 
    <s:Rect left="0" right="0" top="2" height="4" radiusX="2">
        <s:fill>
            <s:BitmapFill source="@Embed('assets/pattern_143.gif')" fillMode="repeat" alpha="0.35" />
        </s:fill>
    </s:Rect>
 
</s:Skin>

[GoogleAdsWide]

View source is enabled in the following example.

[Squidfingers]

You can also set the showTrackHighlight and trackHighlightSkin styles 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/2010/04/14/creating-a-custom-track-highlight-skin-on-an-mx-hslider-control-in-flex-4/ -->
<s:Application name="MX_HSlider_trackHighlightSkin_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">
 
    <fx:Style>
        @namespace s "library://ns.adobe.com/flex/spark";
        @namespace mx "library://ns.adobe.com/flex/mx";
 
        mx|HSlider {
            showTrackHighlight: true;
            trackHighlightSkin: ClassReference("skins.CustomSliderTrackHighlightSkin");
        }
    </fx:Style>
 
    <mx:HSlider id="hSl"
            value="5"
            horizontalCenter="0" verticalCenter="0" />
 
</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.

6 thoughts on “Creating a custom track highlight skin on an MX HSlider control in Flex 4

    1. @Brian Davis,

      Currently, the Spark HSlider only supports a single thumb, no track highlight, no ticks, and no labels. If you need that functionality, you either have to extend s:HSlider and add it yourself, or you can still use the mx:HSlider control.

      Peter

  1. Hi,

    I was wondering if you can recreate the showTrackHighlight feature with the spark sliders. Is this possible?

    m.

  2. I’m finding that there are tons of these issues with spark controls where they’ve dropped essential features. I’m constantly going back to mx controls to get things done, all the while the intellisense is recommending the controls that have already failed for my purposes. trackHighlight is a huge one, the other is cue points in the video player, fill colors etc. Is there a roadmap for getting support for these features back or are they just gone for good?

    1. @Matt Foster,

      Some are probably being considered for future releases, some are probably gone for good (or would need to be implemented in custom skins). Your best bet is to file bugs (or enhancement requests) in the public Flex bug base (http://bugs.adobe.com/flex/) and Adobe will consider them on a case-by-case basis (and the more votes an issue gets, the more likely we are to consider it). So please, please file bugs for items you think should be implemented in Spark controls.

      Peter

Comments are closed.