/* global _wpmejsSettings, MediaElementPlayer */
(function ($, _, Backbone) {
'use strict';
/** @namespace wp */
window.wp = window.wp || {};
var WPPlaylistView = Backbone.View.extend(/** @lends WPPlaylistView.prototype */{
/**
* @constructs
*
* @param {Object} options The options to create this playlist view with.
* @param {Object} options.metadata The metadata
*/
initialize : function (options) {
this.index = 0;
this.settings = {};
this.data = options.metadata || $.parseJSON( this.$('script.wp-playlist-script').html() );
this.playerNode = this.$( this.data.type );
this.tracks = new Backbone.Collection( this.data.tracks );
this.current = this.tracks.first();
if ( 'audio' === this.data.type ) {
this.currentTemplate = wp.template( 'wp-playlist-current-item' );
this.currentNode = this.$( '.wp-playlist-current-item' );
}
this.renderCurrent();
if ( this.data.tracklist ) {
this.itemTemplate = wp.template( 'wp-playlist-item' );
this.playingClass = 'wp-playlist-playing';
this.renderTracks();
}
this.playerNode.attr( 'src', this.current.get( 'src' ) );
_.bindAll( this, 'bindPlayer', 'bindResetPlayer', 'setPlayer', 'ended', 'clickTrack' );
if ( ! _.isUndefined( window._wpmejsSettings ) ) {
this.settings = _.clone( _wpmejsSettings );
}
this.settings.success = this.bindPlayer;
this.setPlayer();
},
bindPlayer : function (mejs) {
this.mejs = mejs;
this.mejs.addEventListener( 'ended', this.ended );
},
bindResetPlayer : function (mejs) {
this.bindPlayer( mejs );
this.playCurrentSrc();
},
setPlayer: function (force) {
if ( this.player ) {
this.player.pause();
this.player.remove();
this.playerNode = this.$( this.data.type );
}
if (force) {
this.playerNode.attr( 'src', this.current.get( 'src' ) );
this.settings.success = this.bindResetPlayer;
}
// This is also our bridge to the outside world.
this.player = new MediaElementPlayer( this.playerNode.get(0), this.settings );
},
playCurrentSrc : function () {
this.renderCurrent();
this.mejs.setSrc( this.playerNode.attr( 'src' ) );
this.mejs.load();
this.mejs.play();
},
renderCurrent : function () {
var dimensions, defaultImage = 'wp-includes/images/media/video.svg';
if ( 'video' === this.data.type ) {
if ( this.data.images && this.current.get( 'image' ) && -1 === this.current.get( 'image' ).src.indexOf( defaultImage ) ) {
this.playerNode.attr( 'poster', this.current.get( 'image' ).src );
}
dimensions = this.current.get( 'dimensions' );
if ( dimensions && dimensions.resized ) {
this.playerNode.attr( dimensions.resized );
}
} else {
if ( ! this.data.images ) {
this.current.set( 'image', false );
}
this.currentNode.html( this.currentTemplate( this.current.toJSON() ) );
}
},
renderTracks : function () {
var self = this, i = 1, tracklist = $( '<div class="wp-playlist-tracks"></div>' );
this.tracks.each(function (model) {
if ( ! self.data.images ) {
model.set( 'image', false );
}
model.set( 'artists', self.data.artists );
model.set( 'index', self.data.tracknumbers ? i : false );
tracklist.append( self.itemTemplate( model.toJSON() ) );
i += 1;
});
this.$el.append( tracklist );
this.$( '.wp-playlist-item' ).eq(0).addClass( this.playingClass );
},
events : {
'click .wp-playlist-item' : 'clickTrack',
'click .wp-playlist-next' : 'next',
'click .wp-playlist-prev' : 'prev'
},
clickTrack : function (e) {
e.preventDefault();
this.index = this.$( '.wp-playlist-item' ).index( e.currentTarget );
this.setCurrent();
},
ended : function () {
if ( this.index + 1 < this.tracks.length ) {
this.next();
} else {
this.index = 0;
this.setCurrent();
}
},
next : function () {
this.index = this.index + 1 >= this.tracks.length ? 0 : this.index + 1;
this.setCurrent();
},
prev : function () {
this.index = this.index - 1 < 0 ? this.tracks.length - 1 : this.index - 1;
this.setCurrent();
},
loadCurrent : function () {
var last = this.playerNode.attr( 'src' ) && this.playerNode.attr( 'src' ).split('.').pop(),
current = this.current.get( 'src' ).split('.').pop();
this.mejs && this.mejs.pause();
if ( last !== current ) {
this.setPlayer( true );
} else {
this.playerNode.attr( 'src', this.current.get( 'src' ) );
this.playCurrentSrc();
}
},
setCurrent : function () {
this.current = this.tracks.at( this.index );
if ( this.data.tracklist ) {
this.$( '.wp-playlist-item' )
.removeClass( this.playingClass )
.eq( this.index )
.addClass( this.playingClass );
}
this.loadCurrent();
}
});
/**
* Initialize media playlists in the document.
*
* Only initializes new playlists not previously-initialized.
*
* @since 4.9.3
* @return {void}
*/
function initialize() {
$( '.wp-playlist:not(:has(.mejs-container))' ).each( function() {
new WPPlaylistView( { el: this } );
} );
}
/**
* Expose the API publicly on window.wp.playlist.
*
* @namespace wp.playlist
* @since 4.9.3
* @type {object}
*/
window.wp.playlist = {
initialize: initialize
};
$( document ).ready( initialize );
window.WPPlaylistView = WPPlaylistView;
}(jQuery, _, Backbone));
في جولة حصرية داخل “الغرفة الزرقاء” بقناة BBC العربية، نكشف كواليس واحدة من أكثر غرف الأخبار تطورًا في العالم.
كيف الذكاء اصطناعي يتحكم بالبث دون تدخل بشري، لتقدم تجربة بصرية مذهلة.
الفيديو يستعرض كيف تمزج BBC بين التقنية والاحتراف لتصنع نشرات إخبارية من قلب المستقبل.
