text: /*
   * @ngdoc module
   * @name material.components.backdrop
   * @description Backdrop
   */
  
  /**
   * @ngdoc directive
   * @name mdBackdrop
   * @module material.components.backdrop
   *
   * @restrict E
   *
   * @description
   * `<md-backdrop>` is a backdrop element used by other components, such as dialog and bottom sheet.
   * Apply class `opaque` to make the backdrop use the theme backdrop color.
   *
   */
  
  angular
    .module('material.components.backdrop', ['material.core'])
    .directive('mdBackdrop', function BackdropDirective($mdTheming, $animate, $rootElement, $window, $log, $$rAF, $document) {
      var ERROR_CSS_POSITION = "<md-backdrop> may not work properly in a scrolled, static-positioned parent container.";
  
      return {
        restrict: 'E',
        link: postLink
      };
  
      function postLink(scope, element, attrs) {
  
        // If body scrolling has been disabled using mdUtil.disableBodyScroll(),
        // adjust the 'backdrop' height to account for the fixed 'body' top offset
        var body = $window.getComputedStyle($document[0].body);
        if (body.position == 'fixed') {
          var hViewport = parseInt(body.height, 10) + Math.abs(parseInt(body.top, 10));
          element.css({
            height: hViewport + 'px'
          });
        }
  
        // backdrop may be outside the $rootElement, tell ngAnimate to animate regardless
        if ($animate.pin) $animate.pin(element, $rootElement);
  
        $$rAF(function () {
  
          // Often $animate.enter() is used to append the backDrop element
          // so let's wait until $animate is done...
          var parent = element.parent()[0];
          if (parent) {
            var styles = $window.getComputedStyle(parent);
            if (styles.position == 'static') {
              // backdrop uses position:absolute and will not work properly with parent position:static (default)
              $log.warn(ERROR_CSS_POSITION);
            }
          }
  
          $mdTheming.inherit(element, element.parent());
        });
  
      }
  
    });
  