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/*
* Copyright (C) 2016 Apple Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
class SeekSupport extends MediaControllerSupport
{
// Protected
get mediaEvents()
{
return ["durationchange"];
}
get multiplier()
{
// Implemented by subclasses.
}
buttonPressedStateDidChange(control, isPressed)
{
if (isPressed)
this._startSeeking();
else
this._stopSeeking();
}
syncControl()
{
this.control.enabled = this.mediaController.media.duration <= maxNonLiveDuration;
}
// Private
_startSeeking()
{
const media = this.mediaController.media;
const isPaused = media.paused;
if (isPaused)
media.play();
this._wasPausedWhenSeekingStarted = isPaused;
this._interval = window.setInterval(this._seek.bind(this), SeekSupport.SeekDelay);
this._seek();
}
_stopSeeking()
{
const media = this.mediaController.media;
media.playbackRate = media.defaultPlaybackRate;
if (this._wasPausedWhenSeekingStarted)
media.pause();
if (this._interval)
window.clearInterval(this._interval);
}
_seek()
{
const media = this.mediaController.media;
media.playbackRate = Math.min(SeekSupport.MaximumSeekRate, Math.abs(media.playbackRate * 2)) * this.multiplier;
}
}
SeekSupport.MaximumSeekRate = 8;
SeekSupport.SeekDelay = 1500;
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