/* * 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 MediaControllerSupport { constructor(mediaController) { this.mediaController = mediaController; this.enable(); } // Public enable() { for (let eventType of this.mediaEvents) this.mediaController.media.addEventListener(eventType, this); for (let tracks of this.tracksToMonitor) { for (let eventType of ["change", "addtrack", "removetrack"]) tracks.addEventListener(eventType, this); } if (!this.control) return; this.control.uiDelegate = this; this.syncControl(); } disable() { for (let eventType of this.mediaEvents) this.mediaController.media.removeEventListener(eventType, this); for (let tracks of this.tracksToMonitor) { for (let eventType of ["change", "addtrack", "removetrack"]) tracks.removeEventListener(eventType, this); } if (this.control) this.control.uiDelegate = null; } // Protected get control() { // Implemented by subclasses. } get mediaEvents() { // Implemented by subclasses. return []; } get tracksToMonitor() { // Implemented by subclasses. return []; } buttonWasPressed(control) { // Implemented by subclasses. } controlsUserVisibilityDidChange() { // Implement by subclasses. } handleEvent(event) { // Implemented by subclasses. if (this.control) this.syncControl(); } syncControl() { // Implemented by subclasses. } }