| /* |
| * 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 !== Number.POSITIVE_INFINITY; |
| } |
| |
| // 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; |