mibew/src/mibew/js/source/users/collection_views/agents_collection.js

/*!
 * This file is a part of Mibew Messenger.
 *
 * Copyright 2005-2014 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

(function(Mibew) {

    /**
     * @class Represents online agents bar
     */
    Mibew.Views.AgentsCollection = Mibew.Views.CollectionBase.extend(
        /** @lends Mibew.Views.AgentsCollection.prototype */
        {
            /**
             * Class name for view's DOM element
             * @type String
             */
            className: 'agents-collection',

            /**
             * Map collection events to the view methods
             * @type Object
             */
            collectionEvents: {
                'sort add remove reset': 'render'
            },

            /**
             * Returns default child view constructor.
             *
             * The function is used instead of "childView" property to provide
             * an ability to override child view constructor without this class
             * overriding.
             *
             * @param {Backbone.Model} model The model the view created for.
             * @returns {Backbone.Marionette.ItemView}
             */
            getChildView: function(model) {
                return Mibew.Views.Agent;
            },

            /**
             * View initializer
             */
            initialize: function() {
                // Register events
                this.on('childview:before:render', this.updateIndexes, this);
            },

            /**
             * Update 'isModelFirst' and 'isModelLast' child views fields on
             * collection 'sort', 'add', 'remove' and 'reset' events.Indexies
             */
            updateIndexes: function(childView) {
                // Create some shortcuts
                var collection = this.collection;
                var model = childView.model;

                if (model) {
                    // Update isModelFirst and isModelLast properties
                    childView.isModelFirst = (collection.indexOf(model) == 0);
                    childView.isModelLast = (
                        collection.indexOf(model) == (collection.length - 1)
                    );
                }
            }

        }
    );

})(Mibew);