signal-desktop/js/views/list_view.js

/* vim: ts=4:sw=4:expandtab
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
var Whisper = Whisper || {};

(function () {
  'use strict';

  /*
   * Generic list view that watches a given collection, wraps its members in
   * a given child view and adds the child view elements to its own element.
   */
  Whisper.ListView = Backbone.View.extend({
    tagName: 'ul',
    itemView: Backbone.View,
    initialize: function() {
      this.listenTo(this.collection, 'change', this.render); // auto update
      this.listenTo(this.collection, 'add', this.addOne);
      this.listenTo(this.collection, 'reset', this.addAll);
      this.listenTo(this.collection, 'all', this.render);
    },

    addOne: function(model) {
      if (this.itemView) {
        var view = new this.itemView({model: model});
        this.$el.append(view.render().el);
        this.$el.trigger('add');
      }
    },

    addAll: function() {
      this.$el.html('');
      this.collection.each(this.addOne, this);
    }
  });
})();