WordPress/wp-includes/js/media-models.js

522 lines
14 KiB
JavaScript

if ( typeof wp === 'undefined' )
var wp = {};
(function($){
var Attachment, Attachments, Query, compare;
/**
* wp.media( attributes )
*
* Handles the default media experience. Automatically creates
* and opens a media workflow, and returns the result.
* Does nothing if the controllers do not exist.
*
* @param {object} attributes The properties passed to the main media controller.
* @return {object} A media workflow.
*/
media = wp.media = function( attributes ) {
if ( media.controller.Workflow )
return new media.controller.Workflow( attributes ).attach().render();
};
_.extend( media, { model: {}, view: {}, controller: {} });
/**
* ========================================================================
* UTILITIES
* ========================================================================
*/
/**
* A basic comparator.
*
* @param {mixed} a The primary parameter to compare.
* @param {mixed} b The primary parameter to compare.
* @param {string} ac The fallback parameter to compare, a's cid.
* @param {string} bc The fallback parameter to compare, b's cid.
* @return {number} -1: a should come before b.
* 0: a and b are of the same rank.
* 1: b should come before a.
*/
compare = function( a, b, ac, bc ) {
if ( _.isEqual( a, b ) )
return ac === bc ? 0 : (ac > bc ? -1 : 1);
else
return a > b ? -1 : 1;
};
_.extend( media, {
/**
* media.template( id )
*
* Fetches a template by id.
*
* @param {string} id A string that corresponds to a DOM element with an id prefixed with "tmpl-".
* For example, "attachment" maps to "tmpl-attachment".
* @return {function} A function that lazily-compiles the template requested.
*/
template: _.memoize( function( id ) {
var compiled;
return function( data ) {
compiled = compiled || _.template( $( '#tmpl-' + id ).html() );
return compiled( data );
};
}),
/**
* media.post( [action], [data] )
*
* Sends a POST request to WordPress.
*
* @param {string} action The slug of the action to fire in WordPress.
* @param {object} data The data to populate $_POST with.
* @return {$.promise} A jQuery promise that represents the request.
*/
post: function( action, data ) {
return media.ajax({
data: _.isObject( action ) ? action : _.extend( data || {}, { action: action })
});
},
/**
* media.ajax( [action], [options] )
*
* Sends a POST request to WordPress.
*
* @param {string} action The slug of the action to fire in WordPress.
* @param {object} options The options passed to jQuery.ajax.
* @return {$.promise} A jQuery promise that represents the request.
*/
ajax: function( action, options ) {
if ( _.isObject( action ) ) {
options = action;
} else {
options = options || {};
options.data = _.extend( options.data || {}, { action: action });
}
options = _.defaults( options || {}, {
type: 'POST',
url: ajaxurl,
context: this
});
return $.Deferred( function( deferred ) {
// Transfer success/error callbacks.
if ( options.success )
deferred.done( options.success );
if ( options.error )
deferred.fail( options.error );
delete options.success;
delete options.error;
// Use with PHP's wp_send_json_success() and wp_send_json_error()
$.ajax( options ).done( function( response ) {
if ( _.isObject( response ) && ! _.isUndefined( response.success ) )
deferred[ response.success ? 'resolveWith' : 'rejectWith' ]( this, [response.data] );
else
deferred.rejectWith( this, [response] );
}).fail( function() {
deferred.rejectWith( this, arguments );
});
}).promise();
}
});
/**
* ========================================================================
* MODELS
* ========================================================================
*/
/**
* wp.media.model.Attachment
*/
Attachment = media.model.Attachment = Backbone.Model.extend({
sync: function( method, model, options ) {
// Overload the read method so Attachment.fetch() functions correctly.
if ( 'read' === method ) {
options = options || {};
options.context = this;
options.data = _.extend( options.data || {}, {
action: 'get-attachment',
id: this.id
});
return media.ajax( options );
// Otherwise, fall back to Backbone.sync()
} else {
return Backbone.sync.apply( this, arguments );
}
},
parse: function( resp, xhr ) {
// Convert date strings into Date objects.
resp.date = new Date( resp.date );
resp.modified = new Date( resp.modified );
return resp;
}
}, {
create: function( attrs ) {
return Attachments.all.push( attrs );
},
get: _.memoize( function( id, attachment ) {
return Attachments.all.push( attachment || { id: id } );
})
});
/**
* wp.media.model.Attachments
*/
Attachments = media.model.Attachments = Backbone.Collection.extend({
model: Attachment,
initialize: function( models, options ) {
options = options || {};
this.props = new Backbone.Model();
this.filters = options.filters || {};
// Bind default `change` events to the `props` model.
this.props.on( 'change:order', this._changeOrder, this );
this.props.on( 'change:orderby', this._changeOrderby, this );
this.props.on( 'change:query', this._changeQuery, this );
this.props.on( 'change:search', this._changeSearch, this );
// Set the `props` model and fill the default property values.
this.props.set( _.defaults( options.props || {}, {
order: 'DESC'
}) );
// Observe another `Attachments` collection if one is provided.
if ( options.observe )
this.observe( options.observe );
},
// Automatically sort the collection when the order changes.
_changeOrder: function( model, order ) {
if ( this.comparator )
this.sort();
},
// Set the default comparator only when the `orderby` property is set.
_changeOrderby: function( model, orderby ) {
// If a different comparator is defined, bail.
if ( this.comparator && this.comparator !== Attachments.comparator )
return;
if ( orderby )
this.comparator = Attachments.comparator;
else
delete this.comparator;
},
// If the `query` property is set to true, query the server using
// the `props` values, and sync the results to this collection.
_changeQuery: function( model, query ) {
if ( query ) {
this.props.on( 'change', this._requery, this );
this._requery();
} else {
this.props.off( 'change', this._requery, this );
}
},
_changeSearch: function( model, term ) {
// Bail if we're currently searching for the same term.
if ( this.props.get('search') === term )
return;
if ( term && ! this.filters.search )
this.filters.search = Attachments.filters.search;
else if ( ! term && this.filters.search === Attachments.filters.search )
delete this.filters.search;
// If no `Attachments` model is provided to source the searches
// from, then automatically generate a source from the existing
// models.
if ( ! this.props.get('source') )
this.props.set( 'source', new Attachments( this.models ) );
this.reset( this.props.get('source').filter( this.validator ) );
},
validator: function( attachment ) {
return _.all( this.filters, function( filter, key ) {
return !! filter.call( this, attachment );
}, this );
},
validate: function( attachment, options ) {
return this[ this.validator( attachment ) ? 'add' : 'remove' ]( attachment, options );
},
observe: function( attachments ) {
attachments.on( 'add change', this.validate, this );
},
unobserve: function( attachments ) {
attachments.off( 'add change', this.validate, this );
},
mirror: function( attachments ) {
if ( this.mirroring && this.mirroring === attachments )
return;
this.unmirror();
this.mirroring = attachments;
this.reset( attachments.models );
attachments.on( 'add', this._mirrorAdd, this );
attachments.on( 'remove', this._mirrorRemove, this );
attachments.on( 'reset', this._mirrorReset, this );
},
unmirror: function() {
if ( ! this.mirroring )
return;
this.mirroring.off( 'add', this._mirrorAdd, this );
this.mirroring.off( 'remove', this._mirrorRemove, this );
this.mirroring.off( 'reset', this._mirrorReset, this );
delete this.mirroring;
},
_mirrorAdd: function( attachment, attachments, options ) {
this.add( attachment, { at: options.index });
},
_mirrorRemove: function( attachment ) {
this.remove( attachment );
},
_mirrorReset: function( attachments ) {
this.reset( attachments.models );
},
more: function( options ) {
if ( this.mirroring && this.mirroring.more )
return this.mirroring.more( options );
},
parse: function( resp, xhr ) {
return _.map( resp, function( attrs ) {
var attachment = Attachment.get( attrs.id );
return attachment.set( attachment.parse( attrs, xhr ) );
});
},
_requery: function() {
if ( this.props.get('query') )
this.mirror( Query.get( this.props.toJSON() ) );
}
}, {
comparator: function( a, b ) {
var key = this.props.get('orderby'),
order = this.props.get('order'),
ac = a.cid,
bc = b.cid;
a = a.get( key );
b = b.get( key );
if ( 'date' === key || 'modified' === key ) {
a = a || new Date();
b = b || new Date();
}
return ( 'DESC' === order ) ? compare( a, b, ac, bc ) : compare( b, a, bc, ac );
},
filters: {
// Note that this client-side searching is *not* equivalent
// to our server-side searching.
search: function( attachment ) {
if ( ! this.searching )
return true;
return _.any(['title','filename','description','caption','name'], function( key ) {
var value = attachment.get( key );
return value && -1 !== value.search( this.searching );
}, this );
}
}
});
Attachments.all = new Attachments();
/**
* wp.media.query
*/
media.query = function( props ) {
return new Attachments( null, {
props: _.extend( _.defaults( props || {}, { orderby: 'date' } ), { query: true } )
});
};
/**
* wp.media.model.Query
*
* A set of attachments that corresponds to a set of consecutively paged
* queries on the server.
*
* Note: Do NOT change this.args after the query has been initialized.
* Things will break.
*/
Query = media.model.Query = Attachments.extend({
initialize: function( models, options ) {
options = options || {};
Attachments.prototype.initialize.apply( this, arguments );
this.args = options.args;
this.hasMore = true;
this.created = new Date();
this.filters.order = function( attachment ) {
if ( ! this.comparator )
return true;
// We want any items that can be placed before the last
// item in the set. If we add any items after the last
// item, then we can't guarantee the set is complete.
if ( this.length ) {
return 1 !== this.comparator( attachment, this.last() );
// Handle the case where there are no items yet and
// we're sorting for recent items. In that case, we want
// changes that occurred after we created the query.
} else if ( 'DESC' === this.args.order && ( 'date' === this.args.orderby || 'modified' === this.args.orderby ) ) {
return attachment.get( this.args.orderby ) >= this.created;
}
// Otherwise, we don't want any items yet.
return false;
};
this.observe( Attachments.all );
},
more: function( options ) {
var query = this;
if ( ! this.hasMore )
return;
options = options || {};
options.add = true;
return this.fetch( options ).done( function( resp ) {
if ( _.isEmpty( resp ) || resp.length < this.args.posts_per_page )
query.hasMore = false;
});
},
sync: function( method, model, options ) {
var fallback;
// Overload the read method so Attachment.fetch() functions correctly.
if ( 'read' === method ) {
options = options || {};
options.context = this;
options.data = _.extend( options.data || {}, {
action: 'query-attachments'
});
// Clone the args so manipulation is non-destructive.
args = _.clone( this.args );
// Determine which page to query.
args.paged = Math.floor( this.length / args.posts_per_page ) + 1;
options.data.query = args;
return media.ajax( options );
// Otherwise, fall back to Backbone.sync()
} else {
fallback = Attachments.prototype.sync ? Attachments.prototype : Backbone;
return fallback.sync.apply( this, arguments );
}
}
}, {
defaultProps: {
orderby: 'date',
order: 'DESC'
},
defaultArgs: {
posts_per_page: 40
},
orderby: {
allowed: [ 'name', 'author', 'date', 'title', 'modified', 'uploadedTo', 'id' ],
valuemap: {
'id': 'ID',
'uploadedTo': 'parent'
}
},
propmap: {
'search': 's'
},
// Caches query objects so queries can be easily reused.
get: (function(){
var queries = [];
return function( props, options ) {
var args = {},
orderby = Query.orderby,
defaults = Query.defaultProps,
query;
// Remove the `query` property. This isn't linked to a query,
// this *is* the query.
delete props.query;
// Fill default args.
_.defaults( props, defaults );
// Normalize the order.
props.order = props.order.toUpperCase();
if ( 'DESC' !== props.order && 'ASC' !== props.order )
props.order = defaults.order.toUpperCase();
// Ensure we have a valid orderby value.
if ( ! _.contains( orderby.allowed, props.orderby ) )
props.orderby = defaults.orderby;
// Generate the query `args` object.
// Correct any differing property names.
_.each( props, function( value, prop ) {
args[ Query.propmap[ prop ] || prop ] = value;
});
// Fill any other default query args.
_.defaults( args, Query.defaultArgs );
// `props.orderby` does not always map directly to `args.orderby`.
// Substitute exceptions specified in orderby.keymap.
args.orderby = orderby.valuemap[ props.orderby ] || props.orderby;
// Search the query cache for matches.
query = _.find( queries, function( query ) {
return _.isEqual( query.args, args );
});
// Otherwise, create a new query and add it to the cache.
if ( ! query ) {
query = new Query( [], _.extend( options || {}, {
props: props,
args: args
} ) );
queries.push( query );
}
return query;
};
}())
});
}(jQuery));