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VolumeSlider.as
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/*
Feathers
Copyright 2012-2021 Bowler Hat LLC. All Rights Reserved.
This program is free software. You can redistribute and/or modify it in
accordance with the terms of the accompanying license agreement.
*/
package feathers.media
{
import feathers.controls.Slider;
import feathers.events.MediaPlayerEventType;
import feathers.skins.IStyleProvider;
import flash.media.SoundTransform;
import starling.events.Event;
/**
* A specialized slider that controls the volume of a media player that
* plays audio content.
*
* @see ../../../help/sound-player.html How to use the Feathers SoundPlayer component
* @see ../../../help/video-player.html How to use the Feathers VideoPlayer component
*
* @productversion Feathers 2.2.0
*/
public class VolumeSlider extends Slider implements IMediaPlayerControl
{
/**
* The default value added to the <code>styleNameList</code> of the
* minimum track.
*
* @see feathers.core.FeathersControl#styleNameList
*/
public static const DEFAULT_CHILD_STYLE_NAME_MINIMUM_TRACK:String = "feathers-volume-slider-minimum-track";
/**
* The default value added to the <code>styleNameList</code> of the
* maximum track.
*
* @see feathers.core.FeathersControl#styleNameList
*/
public static const DEFAULT_CHILD_STYLE_NAME_MAXIMUM_TRACK:String = "feathers-volume-slider-maximum-track";
/**
* The default value added to the <code>styleNameList</code> of the thumb.
*
* @see feathers.core.FeathersControl#styleNameList
*/
public static const DEFAULT_CHILD_STYLE_NAME_THUMB:String = "feathers-volume-slider-thumb";
/**
* The default <code>IStyleProvider</code> for all
* <code>VolumeSlider</code> components.
*
* @default null
* @see feathers.core.FeathersControl#styleProvider
*/
public static var globalStyleProvider:IStyleProvider;
/**
* Constructor.
*/
public function VolumeSlider()
{
super();
this.thumbStyleName = VolumeSlider.DEFAULT_CHILD_STYLE_NAME_THUMB;
this.minimumTrackStyleName = VolumeSlider.DEFAULT_CHILD_STYLE_NAME_MINIMUM_TRACK;
this.maximumTrackStyleName = VolumeSlider.DEFAULT_CHILD_STYLE_NAME_MAXIMUM_TRACK;
this.minimum = 0;
this.maximum = 1;
this.addEventListener(Event.CHANGE, volumeSlider_changeHandler);
}
/**
* @private
*/
override protected function get defaultStyleProvider():IStyleProvider
{
return VolumeSlider.globalStyleProvider;
}
/**
* @private
*/
protected var _ignoreChanges:Boolean = false;
/**
* @private
*/
protected var _mediaPlayer:IAudioPlayer;
/**
* @inheritDoc
*/
public function get mediaPlayer():IMediaPlayer
{
return this._mediaPlayer;
}
/**
* @private
*/
public function set mediaPlayer(value:IMediaPlayer):void
{
if(this._mediaPlayer == value)
{
return;
}
this._mediaPlayer = value as IAudioPlayer;
this.refreshVolumeFromMediaPlayer();
if(this._mediaPlayer)
{
this._mediaPlayer.addEventListener(MediaPlayerEventType.SOUND_TRANSFORM_CHANGE, mediaPlayer_soundTransformChangeHandler);
}
this.invalidate(INVALIDATION_FLAG_DATA);
}
/**
* @private
*/
protected function refreshVolumeFromMediaPlayer():void
{
var oldIgnoreChanges:Boolean = this._ignoreChanges;
this._ignoreChanges = true;
if(this._mediaPlayer)
{
this.value = this._mediaPlayer.soundTransform.volume;
}
else
{
this.value = 0;
}
this._ignoreChanges = oldIgnoreChanges;
}
/**
* @private
*/
protected function mediaPlayer_soundTransformChangeHandler(event:Event):void
{
this.refreshVolumeFromMediaPlayer();
}
/**
* @private
*/
protected function volumeSlider_changeHandler(event:Event):void
{
if(!this._mediaPlayer || this._ignoreChanges)
{
return;
}
var soundTransform:SoundTransform = this._mediaPlayer.soundTransform;
soundTransform.volume = this._value;
this._mediaPlayer.soundTransform = soundTransform;
}
}
}