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