refactor(ionicTouch): factor ngClick logic out to reusable service

Addresses #802

Author: ajoslin

js/ext/angular/src/directive/ionicTouch.js

@@ -1,10 +1,9 @@
 
 // Similar to Angular's ngTouch, however it uses Ionic's tap detection
-// and click simulation. ngClick 
+// and click simulation. ngClick
 
 (function(angular, ionic) {'use strict';
 
-
 angular.module('ionic.ui.touch', [])
 
   .config(['$provide', function($provide) {
@@ -15,17 +14,16 @@ angular.module('ionic.ui.touch', [])
     }]);
   }])
 
-  .directive('ngClick', ['$parse', function($parse) {
-    
+  /**
+   * @private
+   */
+  .factory('$ionicNgClick', ['$parse', function($parse) {
     function onTap(e) {
       // wire this up to Ionic's tap/click simulation
       ionic.tapElement(e.target, e);
     }
-
-    // Actual linking function.
-    return function(scope, element, attr) {
-
-      var clickHandler = $parse(attr.ngClick);
+    return function(scope, element, clickExpr) {
+      var clickHandler = $parse(clickExpr);
 
       element.on('click', function(event) {
         scope.$apply(function() {
@@ -42,9 +40,13 @@ angular.module('ionic.ui.touch', [])
       scope.$on('$destroy', function () {
         ionic.off('tap', onTap, element[0]);
       });
-
     };
+  }])
 
+  .directive('ngClick', ['$ionicNgClick', function($ionicNgClick) {
+    return function(scope, element, attr) {
+      $ionicNgClick(scope, element, attr.ngClick);
+    };
   }])
 
   .directive('ionStopEvent', function () {