Setting the duration of a sound effect in Flex

The following example shows how you can set the duration of a sound effect in Flex by setting the duration and useDuration properties.

Full code after the jump.

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/08/24/setting-the-duration-of-a-sound-effect-in-flex/ -->
<mx:Application name="SoundEffect_useDuration_test"
        xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:SoundEffect id="soundEffect"
            source="http://www.helpexamples.com/flash/sound/song1.mp3"
            useDuration="{checkBox.selected}"
            duration="{slider.value}" />

    <mx:ApplicationControlBar dock="true">
        <mx:Form styleName="plain">
            <mx:FormItem label="useDuration:">
                <mx:CheckBox id="checkBox"
                        selected="true" />
            </mx:FormItem>
            <mx:FormItem label="duration:">
                <mx:HSlider id="slider"
                        minimum="0"
                        maximum="5000"
                        value="500"
                        snapInterval="100"
                        tickInterval="100"
                        liveDragging="true"
                        showTrackHighlight="true"
                        enabled="{checkBox.selected}" />
            </mx:FormItem>
            <mx:FormItem>
                <mx:Button id="btn"
                        label="Play sound effect"
                        mouseDown="soundEffect.stop();"
                        mouseDownEffect="soundEffect" />
            </mx:FormItem>
        </mx:Form>
    </mx:ApplicationControlBar>

</mx:Application>

View source is enabled in the following example.

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/2008/08/24/setting-the-duration-of-a-sound-effect-in-flex/ -->
<mx:Application name="SoundEffect_useDuration_test"
        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.Button;
            import mx.controls.CheckBox;
            import mx.controls.HSlider;
            import mx.effects.SoundEffect;
            import mx.events.SliderEvent;

            private var soundEffect:SoundEffect;
            private var checkBox:CheckBox;
            private var slider:HSlider;
            private var btn:Button;

            private function init():void {
                soundEffect = new SoundEffect();
                soundEffect.source = "http://www.helpexamples.com/flash/sound/song1.mp3";

                checkBox = new CheckBox();
                checkBox.selected = true;
                checkBox.addEventListener(Event.CHANGE, checkBox_change);

                slider = new HSlider();
                slider.minimum = 0;
                slider.maximum = 5000; /* 5 seconds */
                slider.value = soundEffect.duration;
                slider.snapInterval = 100;
                slider.tickInterval = 100;
                slider.liveDragging = true;
                slider.setStyle("showTrackHighlight", true);
                slider.addEventListener(SliderEvent.CHANGE, slider_change);

                btn = new Button();
                btn.label = "Play sound effect"
                btn.setStyle("mouseDownEffect", soundEffect);
                btn.addEventListener(MouseEvent.MOUSE_DOWN, btn_mouseDown);

                var formItem1:FormItem = new FormItem();
                formItem1.label = "useDuration:";
                formItem1.addChild(checkBox);

                var formItem2:FormItem = new FormItem();
                formItem2.label = "duration:";
                formItem2.addChild(slider);

                var formItem3:FormItem = new FormItem();
                formItem3.addChild(btn);

                var form:Form = new Form();
                form.styleName = "plain";
                form.addChild(formItem1);
                form.addChild(formItem2);
                form.addChild(formItem3);

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

            private function checkBox_change(evt:Event):void {
                soundEffect.useDuration = checkBox.selected;
                slider.enabled = checkBox.selected;
            }

            private function slider_change(evt:SliderEvent):void {
                soundEffect.duration = evt.value;
            }

            private function btn_mouseDown(evt:MouseEvent):void {
                soundEffect.stop();
            }
        ]]>
    </mx:Script>

</mx:Application>