/**
 * @file
 * A Backbone view for the body element.
 */

(function ($, Drupal, Backbone) {

  'use strict';

  Drupal.toolbar.BodyVisualView = Backbone.View.extend(/** @lends Drupal.toolbar.BodyVisualView# */{
    /**
     * Adjusts the body element with the toolbar position and dimension changes.
     *
     * @constructs
     *
     * @augments Backbone.View
     */
    initialize: function () {
      this.listenTo(this.model, 'change:activeTray ', this.render);
      this.listenTo(this.model, 'change:isFixed change:isViewportOverflowConstrained', this.isToolbarFixed);
    },

    isToolbarFixed: function () {
      // When the toolbar is fixed, it will not scroll with page scrolling.
      var isViewportOverflowConstrained = this.model.get('isViewportOverflowConstrained');
      $('body').toggleClass('toolbar-fixed', (isViewportOverflowConstrained || this.model.get('isFixed')));
    },

    /**
     * @inheritdoc
     */
    render: function () {
      $('body')
        // Toggle the toolbar-tray-open class on the body element. The class is
        // applied when a toolbar tray is active. Padding might be applied to
        // the body element to prevent the tray from overlapping content.
        .toggleClass('toolbar-tray-open', !!this.model.get('activeTray'));
    }
  });

}(jQuery, Drupal, Backbone));