Setting the item selection duration on a List control in Flex

The following example shows how you can set the item selection duration on a Flex List control by setting the selectionDuration style.

Full code after the jump.

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/07/30/setting-the-item-selection-duration-on-a-list-control-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:Array id="arr">
        <mx:Object label="One" />
        <mx:Object label="Two" />
        <mx:Object label="Three" />
        <mx:Object label="Four" />
        <mx:Object label="Five" />
        <mx:Object label="Six" />
        <mx:Object label="Seven" />
        <mx:Object label="Eight" />
        <mx:Object label="Nine" />
        <mx:Object label="Ten" />
    </mx:Array>

    <mx:ApplicationControlBar dock="true">
        <mx:Form styleName="plain" indicatorGap="0">
            <mx:FormItem label="selectionDuration:">
                <mx:HSlider id="slider"
                        minimum="0"
                        maximum="2000"
                        value="250"
                        snapInterval="1"
                        tickInterval="100"
                        dataTipPrecision="0"
                        liveDragging="true" />
            </mx:FormItem>
        </mx:Form>
    </mx:ApplicationControlBar>

    <mx:List id="list"
            dataProvider="{arr}"
            selectionDuration="{slider.value}"
            width="200"
            selectionColor="red" />

</mx:Application>

You can also set the selectionDuration style in an external .CSS file or <mx:Style /> block, as seen in the following example:

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/07/30/setting-the-item-selection-duration-on-a-list-control-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:Style>
        List {
            selectionColor: red;
            selectionDuration: 1500;
        }
    </mx:Style>

    <mx:Array id="arr">
        <mx:Object label="One" />
        <mx:Object label="Two" />
        <mx:Object label="Three" />
        <mx:Object label="Four" />
        <mx:Object label="Five" />
        <mx:Object label="Six" />
        <mx:Object label="Seven" />
        <mx:Object label="Eight" />
        <mx:Object label="Nine" />
        <mx:Object label="Ten" />
    </mx:Array>

    <mx:List id="list"
            dataProvider="{arr}"
            width="200" />

</mx:Application>

You can also set the selectionDuration style using ActionScript, as seen in the following example:

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/07/30/setting-the-item-selection-duration-on-a-list-control-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:Script>
        <![CDATA[
            import mx.events.SliderEvent;

            private function slider_change(evt:SliderEvent):void {
                list.setStyle("selectionDuration", evt.value);
            }
        ]]>
    </mx:Script>

    <mx:Array id="arr">
        <mx:Object label="One" />
        <mx:Object label="Two" />
        <mx:Object label="Three" />
        <mx:Object label="Four" />
        <mx:Object label="Five" />
        <mx:Object label="Six" />
        <mx:Object label="Seven" />
        <mx:Object label="Eight" />
        <mx:Object label="Nine" />
        <mx:Object label="Ten" />
    </mx:Array>

    <mx:ApplicationControlBar dock="true">
        <mx:Form styleName="plain" indicatorGap="0">
            <mx:FormItem label="selectionDuration:">
                <mx:HSlider id="slider"
                        minimum="0"
                        maximum="2000"
                        value="250"
                        snapInterval="1"
                        tickInterval="100"
                        dataTipPrecision="0"
                        liveDragging="true"
                        change="slider_change(event);" />
            </mx:FormItem>
        </mx:Form>
    </mx:ApplicationControlBar>

    <mx:List id="list"
            dataProvider="{arr}"
            width="200"
            selectionColor="red" />

</mx:Application>

Due to popular demand, here is the “same” example in a more ActionScript friendly format:

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/07/30/setting-the-item-selection-duration-on-a-list-control-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white"
        initialize="init();">

    <mx:Script>
        <![CDATA[
            import mx.containers.ApplicationControlBar;
            import mx.containers.Form;
            import mx.containers.FormItem;
            import mx.controls.HSlider;
            import mx.controls.List;
            import mx.controls.sliderClasses.Slider;
            import mx.events.SliderEvent;

            private var arr:Array;
            private var slider:HSlider;
            private var list:List;

            private function init():void {
                arr = [];
                arr.push({label:"One"});
                arr.push({label:"Two"});
                arr.push({label:"Three"});
                arr.push({label:"Four"});
                arr.push({label:"Five"});
                arr.push({label:"Six"});
                arr.push({label:"Seven"});
                arr.push({label:"Eight"});
                arr.push({label:"Nine"});
                arr.push({label:"Ten"});

                slider = new HSlider();
                slider.minimum = 0;
                slider.maximum = 2000;
                slider.value = 250;
                slider.snapInterval = 1;
                slider.tickInterval = 100;
                slider.liveDragging = true;
                slider.setStyle("dataTipPrecision", 0);
                slider.addEventListener(SliderEvent.CHANGE, slider_change);

                var formItem:FormItem = new FormItem();
                formItem.label = "selectionDuration:";
                formItem.addChild(slider);

                var form:Form = new Form();
                form.styleName = "plain";
                form.setStyle("indicatorGap", 0);
                form.addChild(formItem);

                var appControlBar:ApplicationControlBar;
                appControlBar = new ApplicationControlBar();
                appControlBar.dock = true;
                appControlBar.addChild(form);
                Application.application.addChildAt(appControlBar, 0);

                list = new List();
                list.dataProvider = arr;
                list.width = 200;
                list.setStyle("selectionColor", "red");
                addChild(list);
            }

            private function slider_change(evt:SliderEvent):void {
                list.setStyle("selectionDuration", evt.value);
            }
        ]]>
    </mx:Script>

</mx:Application>