code: function InkRippleDirective ($mdButtonInkRipple, $mdCheckboxInkRipple) {
    return {
      controller: angular.noop,
      link:       function (scope, element, attr) {
        attr.hasOwnProperty('mdInkRippleCheckbox')
            ? $mdCheckboxInkRipple.attach(scope, element)
            : $mdButtonInkRipple.attach(scope, element);
      }
    };
  }
docs: @ngdoc directive
  @name mdInkRipple
  @module material.core.ripple
  
  @description
  The `md-ink-ripple` directive allows you to specify the ripple color or if a ripple is allowed.
  
  @param {string|boolean} md-ink-ripple A color string `#FF0000` or boolean (`false` or `0`) for
  preventing ripple
  
  @usage
  ### String values
  <hljs lang="html">
  <ANY md-ink-ripple="#FF0000">
  Ripples in red
  </ANY>
  
  <ANY md-ink-ripple="false">
  Not rippling
  </ANY>
  </hljs>
  
  ### Interpolated values
  <hljs lang="html">
  <ANY md-ink-ripple="{{ randomColor() }}">
  Ripples with the return value of 'randomColor' function
  </ANY>
  
  <ANY md-ink-ripple="{{ canRipple() }}">
  Ripples if 'canRipple' function return value is not 'false' or '0'
  </ANY>
  </hljs>