angular-vertilize.js

/*!
 * angular-vertilize 1.0.1
 * Christopher Collins
 * https://github.com/Sixthdim/angular-vertilize.git
 * License: MIT
 */
(function () {
  "use strict";

  var module = angular.module('angular.vertilize', []);

  // Vertilize Container
  module.directive('vertilizeContainer', [
    function(){
      return {
        restrict: 'EA',
        controller: [
          '$scope', '$window',
          function($scope, $window){
            // Alias this
            var _this = this;

            // Array of children heights
            _this.childrenHeights = [];

            // API: Allocate child, return index for tracking.
            _this.allocateMe = function(){
              _this.childrenHeights.push(0);
              return (_this.childrenHeights.length - 1);
            };

            // API: Update a child's height
            _this.updateMyHeight = function(index, height){
              _this.childrenHeights[index] = height;
            };

            // API: Get tallest height
            _this.getTallestHeight = function(){
              var height = 0;
              for (var i=0; i < _this.childrenHeights.length; i=i+1){
                height = Math.max(height, _this.childrenHeights[i]);
              }
              return height;
            };

            // Add window resize to digest cycle
            angular.element($window).bind('resize', function(){
              return $scope.$apply();
            });
          }
        ]
      };
    }
  ]);

  // Vertilize Item
  module.directive('vertilize', [
    function(){
      return {
        restrict: 'EA',
        require: '^vertilizeContainer',
        link: function(scope, element, attrs, parent){
          // My index allocation
          var myIndex = parent.allocateMe();

          // Get my real height by cloning so my height is not affected.
          var getMyRealHeight = function(){
            var clone = element.clone()
              .removeAttr('vertilize')
              .css({
                height: '',
                width: element.outerWidth(),
                position: 'fixed',
                top: 0,
                left: 0,
                visibility: 'hidden'
              });
            element.after(clone);
            var realHeight = clone.height();
            clone['remove']();
            return realHeight;
          };

          // Watch my height
          scope.$watch(getMyRealHeight, function(myNewHeight){
            if (myNewHeight){
              parent.updateMyHeight(myIndex, myNewHeight);
            }
          });

          // Watch for tallest height change
          scope.$watch(parent.getTallestHeight, function(tallestHeight){
            if (tallestHeight){
              element.css('height', tallestHeight);
            }
          });
        }
      };
    }
  ]);

}());