Setting the viewport inset on a Spark Scroller control in Flex 4

The following example shows how you can set the viewport inset on a Spark Scroller control in Flex 4 by setting the minViewportInset property.

Full code after the jump.

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/2009/06/19/setting-the-viewport-inset-on-a-spark-scroller-control-in-flex-4/ -->
<s:Application name="Spark_Scroller_minViewportInset_test"
        xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark"
        xmlns:mx="library://ns.adobe.com/flex/halo">

    <mx:ApplicationControlBar width="100%" cornerRadius="0">
        <mx:Form styleName="plain">
            <mx:FormItem label="minViewportInset:">
                <s:HSlider id="slider1"
                        maximum="50"
                        liveDragging="true" />
            </mx:FormItem>
            <mx:FormItem label="width:">
                <s:HSlider id="slider2"
                        minimum="100"
                        maximum="550"
                        value="300"
                        liveDragging="true" />
            </mx:FormItem>
            <mx:FormItem label="height:">
                <s:HSlider id="slider3"
                        minimum="100"
                        maximum="550"
                        value="200"
                        liveDragging="true" />
            </mx:FormItem>
        </mx:Form>
    </mx:ApplicationControlBar>

    <s:Panel horizontalCenter="0" verticalCenter="0">
        <s:Scroller id="scroller"
                minViewportInset="{slider1.value}"
                width="300" height="200">
            <s:Group>
                <s:Rect id="rect"
                        width="{slider2.value}"
                        height="{slider3.value}">
                    <s:fill>
                        <s:LinearGradient rotation="45">
                            <s:GradientEntry color="red" />
                            <s:GradientEntry color="yellow" />
                            <s:GradientEntry color="haloBlue" />
                        </s:LinearGradient>
                    </s:fill>
                </s:Rect>
            </s:Group>
        </s:Scroller>
    </s:Panel>

</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.

One thought on “Setting the viewport inset on a Spark Scroller control in Flex 4

  1. I am trying to implement the View-port scrolling in scroller but it could not work, under is my MXML code.

    <!—->
    <!–

    –>

    <!—->
    <!—->

    and here is my Action Script Code:

    public function ScrollUp(event:MouseEvent = null):void
    {
    id_Scroller.viewport.verticalScrollPosition = id_Scroller.viewport.verticalScrollPosition + 15;
    }

    public function ScrollDown(event:MouseEvent = null):void
    {
    id_Scroller.viewport.verticalScrollPosition = id_Scroller.viewport.verticalScrollPosition – 15;
    }

    any idea ?

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