/** * @output wp-includes/js/wp-custom-header.js */ /* global YT */ (function( window, settings ) { var NativeHandler, YouTubeHandler; /** @namespace wp */ window.wp = window.wp || {}; // Fail gracefully in unsupported browsers. if ( ! ( 'addEventListener' in window ) ) { return; } /** * Trigger an event. * * @param {Element} target HTML element to dispatch the event on. * @param {string} name Event name. */ function trigger( target, name ) { var evt; if ( 'function' === typeof window.Event ) { evt = new Event( name ); } else { evt = document.createEvent( 'Event' ); evt.initEvent( name, true, true ); } target.dispatchEvent( evt ); } /** * Create a custom header instance. * * @memberOf wp * * @class */ function CustomHeader() { this.handlers = { nativeVideo: new NativeHandler(), youtube: new YouTubeHandler() }; } CustomHeader.prototype = { /** * Initialize the custom header. * * If the environment supports video, loops through registered handlers * until one is found that can handle the video. */ initialize: function() { if ( this.supportsVideo() ) { for ( var id in this.handlers ) { var handler = this.handlers[ id ]; if ( 'test' in handler && handler.test( settings ) ) { this.activeHandler = handler.initialize.call( handler, settings ); // Dispatch custom event when the video is loaded. trigger( document, 'wp-custom-header-video-loaded' ); break; } } } }, /** * Determines if the current environment supports video. * * Themes and plugins can override this method to change the criteria. * * @return {boolean} */ supportsVideo: function() { // Don't load video on small screens. @todo Consider bandwidth and other factors. if ( window.innerWidth < settings.minWidth || window.innerHeight < settings.minHeight ) { return false; } return true; }, /** * Base handler for custom handlers to extend. * * @type {BaseHandler} */ BaseVideoHandler: BaseHandler }; /** * Create a video handler instance. * * @memberOf wp * * @class */ function BaseHandler() {} BaseHandler.prototype = { /** * Initialize the video handler. * * @param {Object} settings Video settings. */ initialize: function( settings ) { var handler = this, button = document.createElement( 'button' ); this.settings = settings; this.container = document.getElementById( 'wp-custom-header' ); this.button = button; button.setAttribute( 'type', 'button' ); button.setAttribute( 'id', 'wp-custom-header-video-button' ); button.setAttribute( 'class', 'wp-custom-header-video-button wp-custom-header-video-play' ); button.innerHTML = settings.l10n.play; // Toggle video playback when the button is clicked. button.addEventListener( 'click', function() { if ( handler.isPaused() ) { handler.play(); } else { handler.pause(); } }); // Update the button class and text when the video state changes. this.container.addEventListener( 'play', function() { button.className = 'wp-custom-header-video-button wp-custom-header-video-play'; button.innerHTML = settings.l10n.pause; if ( 'a11y' in window.wp ) { window.wp.a11y.speak( settings.l10n.playSpeak); } }); this.container.addEventListener( 'pause', function() { button.className = 'wp-custom-header-video-button wp-custom-header-video-pause'; button.innerHTML = settings.l10n.play; if ( 'a11y' in window.wp ) { window.wp.a11y.speak( settings.l10n.pauseSpeak); } }); this.ready(); }, /** * Ready method called after a handler is initialized. * * @abstract */ ready: function() {}, /** * Whether the video is paused. * * @abstract * @return {boolean} */ isPaused: function() {}, /** * Pause the video. * * @abstract */ pause: function() {}, /** * Play the video. * * @abstract */ play: function() {}, /** * Append a video node to the header container. * * @param {Element} node HTML element. */ setVideo: function( node ) { var editShortcutNode, editShortcut = this.container.getElementsByClassName( 'customize-partial-edit-shortcut' ); if ( editShortcut.length ) { editShortcutNode = this.container.removeChild( editShortcut[0] ); } this.container.innerHTML = ''; this.container.appendChild( node ); if ( editShortcutNode ) { this.container.appendChild( editShortcutNode ); } }, /** * Show the video controls. * * Appends a play/pause button to header container. */ showControls: function() { if ( ! this.container.contains( this.button ) ) { this.container.appendChild( this.button ); } }, /** * Whether the handler can process a video. * * @abstract * @param {Object} settings Video settings. * @return {boolean} */ test: function() { return false; }, /** * Trigger an event on the header container. * * @param {string} name Event name. */ trigger: function( name ) { trigger( this.container, name ); } }; /** * Create a custom handler. * * @memberOf wp * * @param {Object} protoProps Properties to apply to the prototype. * @return CustomHandler The subclass. */ BaseHandler.extend = function( protoProps ) { var prop; function CustomHandler() { var result = BaseHandler.apply( this, arguments ); return result; } CustomHandler.prototype = Object.create( BaseHandler.prototype ); CustomHandler.prototype.constructor = CustomHandler; for ( prop in protoProps ) { CustomHandler.prototype[ prop ] = protoProps[ prop ]; } return CustomHandler; }; /** * Native video handler. * * @memberOf wp * * @class */ NativeHandler = BaseHandler.extend(/** @lends wp.NativeHandler.prototype */{ /** * Whether the native handler supports a video. * * @param {Object} settings Video settings. * @return {boolean} */ test: function( settings ) { var video = document.createElement( 'video' ); return video.canPlayType( settings.mimeType ); }, /** * Set up a native video element. */ ready: function() { var handler = this, video = document.createElement( 'video' ); video.id = 'wp-custom-header-video'; video.autoplay = true; video.loop = true; video.muted = true; video.playsInline = true; video.width = this.settings.width; video.height = this.settings.height; video.addEventListener( 'play', function() { handler.trigger( 'play' ); }); video.addEventListener( 'pause', function() { handler.trigger( 'pause' ); }); video.addEventListener( 'canplay', function() { handler.showControls(); }); this.video = video; handler.setVideo( video ); video.src = this.settings.videoUrl; }, /** * Whether the video is paused. * * @return {boolean} */ isPaused: function() { return this.video.paused; }, /** * Pause the video. */ pause: function() { this.video.pause(); }, /** * Play the video. */ play: function() { this.video.play(); } }); /** * YouTube video handler. * * @memberOf wp * * @class wp.YouTubeHandler */ YouTubeHandler = BaseHandler.extend(/** @lends wp.YouTubeHandler.prototype */{ /** * Whether the handler supports a video. * * @param {Object} settings Video settings. * @return {boolean} */ test: function( settings ) { return 'video/x-youtube' === settings.mimeType; }, /** * Set up a YouTube iframe. * * Loads the YouTube IFrame API if the 'YT' global doesn't exist. */ ready: function() { var handler = this; if ( 'YT' in window ) { YT.ready( handler.loadVideo.bind( handler ) ); } else { var tag = document.createElement( 'script' ); tag.src = 'https://www.youtube.com/iframe_api'; tag.onload = function () { YT.ready( handler.loadVideo.bind( handler ) ); }; document.getElementsByTagName( 'head' )[0].appendChild( tag ); } }, /** * Load a YouTube video. */ loadVideo: function() { var handler = this, video = document.createElement( 'div' ), // @link http://stackoverflow.com/a/27728417 VIDEO_ID_REGEX = /^.*(?:(?:youtu\.be\/|v\/|vi\/|u\/\w\/|embed\/)|(?:(?:watch)?\?v(?:i)?=|\&v(?:i)?=))([^#\&\?]*).*/; video.id = 'wp-custom-header-video'; handler.setVideo( video ); handler.player = new YT.Player( video, { height: this.settings.height, width: this.settings.width, videoId: this.settings.videoUrl.match( VIDEO_ID_REGEX )[1], events: { onReady: function( e ) { e.target.mute(); handler.showControls(); }, onStateChange: function( e ) { if ( YT.PlayerState.PLAYING === e.data ) { handler.trigger( 'play' ); } else if ( YT.PlayerState.PAUSED === e.data ) { handler.trigger( 'pause' ); } else if ( YT.PlayerState.ENDED === e.data ) { e.target.playVideo(); } } }, playerVars: { autoplay: 1, controls: 0, disablekb: 1, fs: 0, iv_load_policy: 3, loop: 1, modestbranding: 1, playsinline: 1, rel: 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