feat($state): controllers can now be specified dynamically

Closes #389

Author: nateabele

src/state.js

@@ -504,7 +504,13 @@ function $StateProvider(   $urlRouterProvider,   $urlMatcherFactory,           $
 
         promises.push($resolve.resolve(injectables, locals, dst.resolve, state).then(function (result) {
           // References to the controller (only instantiated at link time)
-          result.$$controller = view.controller;
+          if (isFunction(view.controllerProvider)) {
+            result.$$controller = $injector.invoke(
+              view.controllerProvider, null, angular.extend({}, injectables, locals)
+            );
+          } else {
+            result.$$controller = view.controller;
+          }
           // Provide access to the state itself for internal use
           result.$$state = state;
           dst[name] = result;

test/stateSpec.js

@@ -1,6 +1,6 @@
 describe('state', function () {
 
-  var stateProvider, locationProvider, templateParams;
+  var stateProvider, locationProvider, templateParams, ctrlName;
 
   beforeEach(module('ui.router', function($locationProvider) {
     locationProvider = $locationProvider;
@@ -59,6 +59,14 @@ describe('state', function () {
           return "/templates/" + params.item + ".html";
         }
       })
+      .state('dynamicController', {
+        url: "/dynamic/:type",
+        template: "test",
+        controllerProvider: function($stateParams) {
+          ctrlName = $stateParams.type + "Controller";
+          return ctrlName;
+        }
+      })
       .state('home.redirect', {
         url: "redir",
         onEnter: function($state) {
@@ -382,6 +390,12 @@ describe('state', function () {
       var err = "Could not resolve '^.Z' from state 'DD'";
       expect(function() { $state.transitionTo("^.Z", null, { relative: $state.$current }); }).toThrow(err);
     }));
+
+    it('uses the controllerProvider to get controller dynamically', inject(function ($state, $q) {
+      $state.transitionTo('dynamicController', { type: "Acme" });
+      $q.flush();
+      expect(ctrlName).toEqual("AcmeController");
+    }));
   });
 
   describe('.go()', function () {
@@ -595,6 +609,7 @@ describe('state', function () {
         'about.person.item',
         'about.sidebar',
         'about.sidebar.item',
+        'dynamicController',
         'first',
         'home',
         'home.item',