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var l10n = wp.media.view.l10n,
$ = Backbone.$,
Embed;
/**
* wp.media.controller.Embed
*
* A state for embedding media from a URL.
*
* @memberOf wp.media.controller
*
* @class
* @augments wp.media.controller.State
* @augments Backbone.Model
*
* @param {object} attributes The attributes hash passed to the state.
* @param {string} [attributes.id=embed] Unique identifier.
* @param {string} [attributes.title=Insert From URL] Title for the state. Displays in the media menu and the frame's title region.
* @param {string} [attributes.content=embed] Initial mode for the content region.
* @param {string} [attributes.menu=default] Initial mode for the menu region.
* @param {string} [attributes.toolbar=main-embed] Initial mode for the toolbar region.
* @param {string} [attributes.menu=false] Initial mode for the menu region.
* @param {int} [attributes.priority=120] The priority for the state link in the media menu.
* @param {string} [attributes.type=link] The type of embed. Currently only link is supported.
* @param {string} [attributes.url] The embed URL.
* @param {object} [attributes.metadata={}] Properties of the embed, which will override attributes.url if set.
*/
Embed = wp.media.controller.State.extend(/** @lends wp.media.controller.Embed.prototype */{
defaults: {
id: 'embed',
title: l10n.insertFromUrlTitle,
content: 'embed',
menu: 'default',
toolbar: 'main-embed',
priority: 120,
type: 'link',
url: '',
metadata: {}
},
// The amount of time used when debouncing the scan.
sensitivity: 400,
initialize: function(options) {
this.metadata = options.metadata;
this.debouncedScan = _.debounce( _.bind( this.scan, this ), this.sensitivity );
this.props = new Backbone.Model( this.metadata || { url: '' });
this.props.on( 'change:url', this.debouncedScan, this );
this.props.on( 'change:url', this.refresh, this );
this.on( 'scan', this.scanImage, this );
},
/**
* Trigger a scan of the embedded URL's content for metadata required to embed.
*
* @fires wp.media.controller.Embed#scan
*/
scan: function() {
var scanners,
embed = this,
attributes = {
type: 'link',
scanners: []
};
/*
* Scan is triggered with the list of `attributes` to set on the
* state, useful for the 'type' attribute and 'scanners' attribute,
* an array of promise objects for asynchronous scan operations.
*/
if ( this.props.get('url') ) {
this.trigger( 'scan', attributes );
}
if ( attributes.scanners.length ) {
scanners = attributes.scanners = $.when.apply( $, attributes.scanners );
scanners.always( function() {
if ( embed.get('scanners') === scanners ) {
embed.set( 'loading', false );
}
});
} else {
attributes.scanners = null;
}
attributes.loading = !! attributes.scanners;
this.set( attributes );
},
/**
* Try scanning the embed as an image to discover its dimensions.
*
* @param {Object} attributes
*/
scanImage: function( attributes ) {
var frame = this.frame,
state = this,
url = this.props.get('url'),
image = new Image(),
deferred = $.Deferred();
attributes.scanners.push( deferred.promise() );
// Try to load the image and find its width/height.
image.onload = function() {
deferred.resolve();
if ( state !== frame.state() || url !== state.props.get('url') ) {
return;
}
state.set({
type: 'image'
});
state.props.set({
width: image.width,
height: image.height
});
};
image.onerror = deferred.reject;
image.src = url;
},
refresh: function() {
this.frame.toolbar.get().refresh();
},
reset: function() {
this.props.clear().set({ url: '' });
if ( this.active ) {
this.refresh();
}
}
});
module.exports = Embed;
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