137 lines
3.7 KiB
JavaScript
137 lines
3.7 KiB
JavaScript
/*globals wp, _, Backbone */
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/**
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* wp.media.controller.Embed
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*
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* A state for embedding media from a URL.
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*
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* @class
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* @augments wp.media.controller.State
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* @augments Backbone.Model
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*
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* @param {object} attributes The attributes hash passed to the state.
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* @param {string} [attributes.id=embed] Unique identifier.
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* @param {string} [attributes.title=Insert From URL] Title for the state. Displays in the media menu and the frame's title region.
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* @param {string} [attributes.content=embed] Initial mode for the content region.
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* @param {string} [attributes.menu=default] Initial mode for the menu region.
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* @param {string} [attributes.toolbar=main-embed] Initial mode for the toolbar region.
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* @param {string} [attributes.menu=false] Initial mode for the menu region.
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* @param {int} [attributes.priority=120] The priority for the state link in the media menu.
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* @param {string} [attributes.type=link] The type of embed. Currently only link is supported.
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* @param {string} [attributes.url] The embed URL.
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* @param {object} [attributes.metadata={}] Properties of the embed, which will override attributes.url if set.
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*/
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var l10n = wp.media.view.l10n,
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$ = Backbone.$,
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Embed;
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Embed = wp.media.controller.State.extend({
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defaults: {
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id: 'embed',
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title: l10n.insertFromUrlTitle,
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content: 'embed',
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menu: 'default',
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toolbar: 'main-embed',
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priority: 120,
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type: 'link',
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url: '',
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metadata: {}
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},
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// The amount of time used when debouncing the scan.
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sensitivity: 200,
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initialize: function(options) {
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this.metadata = options.metadata;
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this.debouncedScan = _.debounce( _.bind( this.scan, this ), this.sensitivity );
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this.props = new Backbone.Model( this.metadata || { url: '' });
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this.props.on( 'change:url', this.debouncedScan, this );
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this.props.on( 'change:url', this.refresh, this );
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this.on( 'scan', this.scanImage, this );
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},
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/**
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* Trigger a scan of the embedded URL's content for metadata required to embed.
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*
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* @fires wp.media.controller.Embed#scan
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*/
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scan: function() {
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var scanners,
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embed = this,
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attributes = {
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type: 'link',
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scanners: []
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};
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// Scan is triggered with the list of `attributes` to set on the
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// state, useful for the 'type' attribute and 'scanners' attribute,
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// an array of promise objects for asynchronous scan operations.
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if ( this.props.get('url') ) {
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this.trigger( 'scan', attributes );
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}
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if ( attributes.scanners.length ) {
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scanners = attributes.scanners = $.when.apply( $, attributes.scanners );
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scanners.always( function() {
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if ( embed.get('scanners') === scanners ) {
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embed.set( 'loading', false );
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}
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});
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} else {
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attributes.scanners = null;
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}
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attributes.loading = !! attributes.scanners;
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this.set( attributes );
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},
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/**
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* Try scanning the embed as an image to discover its dimensions.
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*
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* @param {Object} attributes
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*/
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scanImage: function( attributes ) {
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var frame = this.frame,
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state = this,
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url = this.props.get('url'),
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image = new Image(),
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deferred = $.Deferred();
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attributes.scanners.push( deferred.promise() );
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// Try to load the image and find its width/height.
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image.onload = function() {
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deferred.resolve();
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if ( state !== frame.state() || url !== state.props.get('url') ) {
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return;
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}
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state.set({
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type: 'image'
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});
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state.props.set({
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width: image.width,
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height: image.height
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});
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};
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image.onerror = deferred.reject;
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image.src = url;
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},
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refresh: function() {
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this.frame.toolbar.get().refresh();
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},
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reset: function() {
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this.props.clear().set({ url: '' });
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if ( this.active ) {
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this.refresh();
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}
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}
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});
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module.exports = Embed;
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