feat(rating): add rating directive

Closes #337

src/rating/docs/demo.html

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+<div ng-controller="RatingDemoCtrl">
+    <rating value="rate" max="10" readonly="isReadonly"></rating>
+
+    <hr/>
+    <pre>Rate: <b>{{rate}}</b>  - Readonly is: <i>{{isReadonly}}</i></pre>
+
+    <hr/>
+    <button class="btn btn-small btn-danger" ng-click="rate = 0" ng-disabled="isReadonly">Clear</button>
+    <button class="btn btn-small" ng-click="isReadonly = ! isReadonly">Toggle Readonly</button>
+</div>

src/rating/docs/demo.js

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+var RatingDemoCtrl = function ($scope) {
+  $scope.rate = 7;
+  $scope.isReadonly = false;
+};

src/rating/docs/readme.md

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+Rating directive that will take care of visualising a star rating bar.
+
+It also provides optional attribute `max` to vary the number of stars and `readonly` attribute to diasble user's interaction.

src/rating/rating.js

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+angular.module('ui.bootstrap.rating', [])
+
+.constant('ratingConfig', {
+  max: 5
+})
+
+.directive('rating', ['ratingConfig', '$parse', function(ratingConfig, $parse) {
+  return {
+    restrict: 'EA',
+    scope: {
+      value: '='
+    },
+    templateUrl: 'template/rating/rating.html',
+    replace: true,
+    link: function(scope, element, attrs) {
+
+      var maxRange = angular.isDefined(attrs.max) ? scope.$eval(attrs.max) : ratingConfig.max;
+
+      scope.range = [];
+      for (var i = 1; i <= maxRange; i++) {
+          scope.range.push(i);
+      }
+
+      scope.rate = function(value) {
+          if ( ! scope.readonly ) {
+              scope.value = value;
+          }
+      };
+
+      scope.enter = function(value) {
+          if ( ! scope.readonly ) {
+              scope.val = value;
+          }
+      };
+
+      scope.reset = function() {
+          scope.val = angular.copy(scope.value);
+      };
+      scope.reset();
+
+      scope.$watch('value', function(value) {
+          scope.val = value;
+      });
+
+      scope.readonly = false;
+      if (attrs.readonly) {
+          scope.$parent.$watch($parse(attrs.readonly), function(value) {
+              scope.readonly = !!value;
+          });
+      }
+    }
+  };
+}]);

src/rating/test/rating.spec.js

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+describe('rating directive', function () {
+  var $rootScope, element;
+  beforeEach(module('ui.bootstrap.rating'));
+  beforeEach(module('template/rating/rating.html'));
+  beforeEach(inject(function(_$compile_, _$rootScope_) {
+    $compile = _$compile_;
+    $rootScope = _$rootScope_;
+    $rootScope.rate = 3;
+    element = $compile('<rating value="rate"></rating>')($rootScope);
+    $rootScope.$digest();
+  }));
+
+  function getState(stars) {
+    var state = [];
+    for (var i = 0, n = stars.length; i < n; i++) {
+      state.push( (stars.eq(i).hasClass('icon-star') && ! stars.eq(i).hasClass('icon-star-empty')) );
+    }
+    return state;
+  }
+
+  it('contains the default number of icons', function() {
+    expect(element.find('i').length).toBe(5);
+  });
+
+  it('initializes the default star icons as selected', function() {
+    var stars = element.find('i');
+    expect(getState(stars)).toEqual([true, true, true, false, false]);
+  });
+
+  it('handles correcty the click event', function() {
+    var stars = element.find('i');
+
+    var star2 = stars.eq(1);
+    star2.click();
+    $rootScope.$digest();
+    expect(getState(stars)).toEqual([true, true, false, false, false]);
+    expect($rootScope.rate).toBe(2);
+
+    var star5 = stars.eq(4);
+    star5.click();
+    $rootScope.$digest();
+    expect(getState(stars)).toEqual([true, true, true, true, true]);
+    expect($rootScope.rate).toBe(5);
+  });
+
+  it('handles correcty the hover event', function() {
+    var stars = element.find('i');
+
+    var star2 = stars.eq(1);
+    star2.trigger('mouseover');
+    $rootScope.$digest();
+    expect(getState(stars)).toEqual([true, true, false, false, false]);
+    expect($rootScope.rate).toBe(3);
+
+    var star5 = stars.eq(4);
+    star5.trigger('mouseover');
+    $rootScope.$digest();
+    expect(getState(stars)).toEqual([true, true, true, true, true]);
+    expect($rootScope.rate).toBe(3);
+
+    element.trigger('mouseout');
+    expect(getState(stars)).toEqual([true, true, true, false, false]);
+    expect($rootScope.rate).toBe(3);
+  });
+
+  it('changes the number of selected icons when value changes', function() {
+    $rootScope.rate = 2;
+    $rootScope.$digest();
+
+    var stars = element.find('i');
+    expect(getState(stars)).toEqual([true, true, false, false, false]);
+  });
+
+  it('shows different number of icons when `max` attribute is set', function() {
+    element = $compile('<rating value="rate" max="7"></rating>')($rootScope);
+    $rootScope.$digest();
+
+    expect(element.find('i').length).toBe(7);
+  });
+
+  it('handles readonly attribute', function() {
+    $rootScope.isReadonly = true;
+    element = $compile('<rating value="rate" readonly="isReadonly"></rating>')($rootScope);
+    $rootScope.$digest();
+
+    var stars = element.find('i');
+    expect(getState(stars)).toEqual([true, true, true, false, false]);
+
+    var star5 = stars.eq(4);
+    star5.trigger('mouseover');
+    $rootScope.$digest();
+    expect(getState(stars)).toEqual([true, true, true, false, false]);
+
+    $rootScope.isReadonly = false;
+    $rootScope.$digest();
+
+    star5.trigger('mouseover');
+    $rootScope.$digest();
+    expect(getState(stars)).toEqual([true, true, true, true, true]);
+  });
+
+});
+
+describe('setting ratingConfig', function() {
+  var $rootScope, element;
+  var originalConfig = {};
+  beforeEach(module('ui.bootstrap.rating'));
+  beforeEach(module('template/rating/rating.html'));
+  beforeEach(inject(function(_$compile_, _$rootScope_, ratingConfig) {
+    $compile = _$compile_;
+    $rootScope = _$rootScope_;
+    $rootScope.rate = 5;
+    angular.extend(originalConfig, ratingConfig);
+    ratingConfig.max = 10;
+    element = $compile('<rating value="rate"></rating>')($rootScope);
+    $rootScope.$digest();
+  }));
+  afterEach(inject(function(ratingConfig) {
+    // return it to the original state
+    angular.extend(ratingConfig, originalConfig);
+  }));
+
+  it('should change number of icon elements', function () {
+    expect(element.find('i').length).toBe(10);
+  });
+
+});
+

template/rating/rating.html

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+<span ng-mouseleave="reset()">
+	<i ng-repeat="number in range" ng-mouseenter="enter(number)" ng-click="rate(number)" ng-class="{'icon-star': number <= val, 'icon-star-empty': number > val}"></i>
+</span>