fix(ngTouch): deprecate ngClick override directive, disable it by default

This commit deprecates the ngClick directive from the ngTouch module.
Additionally, it disables it by default. It can be enabled in the new $touchProvider with
$touchProvider.ngClickOverrideEnabled() method.

The directive was conceived to remove the 300ms delay
for click events on mobile browsers, by sending a synthetic click event on touchstart.
It also tried to make sure that the original click event that the browser sends after 300ms
was "busted", so that no redundant "ghost-clicks" appear.

There are various reasons why the directive is being deprecated.

- "This is an ugly, terrible hack!" (says so in the source)
- It is plagued by various bugs that are hard to fix / test for all platforms (see below)
- Simply including ngTouch activates the ngClick override, which means even if you simply want
to use ngSwipe, you may break parts of your app
- There exist alternatives for removing the 300ms delay, that can be used very well with Angular:
[FastClick](https://github.com/ftlabs/fastclick), [Tappy!](https://github.com/filamentgroup/tappy/)
(There's also hammer.js for touch events / gestures)
- The 300ms delay itself is on the way out - Chrome and Firefox for Android remove the 300ms delay
when the usual `<meta name="viewport" content="width=device-width">` is set. In IE, the
`touch-action` css property can be set to `none` or `manipulation` to remove the delay. Finally,
since iOs 8, Safari doesn't delay "slow" taps anymore. There are some caveats though, which can be
found in this excellent article on which this summary is based: http://developer.telerik.com/featured/300-ms-click-delay-ios-8/

Note that this change does not affect the `ngSwipe` directive.

Issues with interactive elements (input, a etc.) when parent element has ngClick:
Closes angular#4030
Closes angular#5307
Closes angular#6001
Closes angular#6432
Closes angular#7231
Closes angular#11358
Closes angular#12082
Closes angular#12153
Closes angular#12392
Closes angular#12545
Closes angular#12867
Closes angular#13213
Closes angular#13558

Other issues:
- incorrect event order
- incorrect event propagation
- ghost-clicks / failing clickbusting with corner cases
- browser specific bugs
- et al.

Closes angular#3296
Closes angular#3347
Closes angular#3447
Closes angular#3999
Closes angular#4428
Closes angular#6251
Closes angular#6330
Closes angular#7134
Closes angular#7935
Closes angular#9724
Closes angular#9744
Closes angular#9872
Closes angular#10211
Closes angular#10366
Closes angular#10918
Closes angular#11197
Closes angular#11261
Closes angular#11342
Closes angular#11577
Closes angular#12150
Closes angular#12317
Closes angular#12455
Closes angular#12734
Closes angular#13122
Closes angular#13272
Closes angular#13447

BREAKING CHANGE:

The `ngClick` override directive from the `ngTouch` module is **deprecated and disabled by default**.
This means that on touch-based devices, users might now experience a 300ms delay before a click event is fired.

If you rely on this directive, you can still enable it with the `$touchProvider.ngClickOverrideEnabled()`method:

```js
angular.module('myApp').config(function($touchProvider) {
  $touchProvider.ngClickOverrideEnabled(true);
});
```

For migration, we recommend using [FastClick](https://github.com/ftlabs/fastclick).
Also note that modern browsers remove the 300ms delay under some circumstances:
- Chrome and Firefox for Android remove the 300ms delay when the well-known `<meta name="viewport" content="width=device-width">` is set
- Internet Explorer removes the delay when  `touch-action` css property is set to `none` or `manipulation`
- Since iOs 8, Safari removes the delay on so-called "slow taps"

See this [article by Telerik](http://developer.telerik.com/featured/300-ms-click-delay-ios-8/) for more info on the topic.
Note that this change does not affect the `ngSwipe` directive.

Author: Narretz

src/ngTouch/directive/ngClick.js

@@ -7,8 +7,17 @@
 /**
  * @ngdoc directive
  * @name ngClick
+ * @deprecated
  *
  * @description
+ * <div class="alert alert-danger">
+ * **DEPRECATION NOTICE**: Beginning with Angular 1.5, this directive is deprecated and by default **disabled**.
+ * The directive will receive no further support and might be removed from future releases.
+ * If you need the directive, you can enable it with the {@link ngTouch.$touchProvider $touchProvider#ngClickOverrideEnabled}
+ * function. We also recommend that you migrate to [FastClick](https://github.com/ftlabs/fastclick).
+ * To learn more about the 300ms delay, this [Telerik article](http://developer.telerik.com/featured/300-ms-click-delay-ios-8/)
+ * gives a good overview.
+ * </div>
  * A more powerful replacement for the default ngClick designed to be used on touchscreen
  * devices. Most mobile browsers wait about 300ms after a tap-and-release before sending
  * the click event. This version handles them immediately, and then prevents the
@@ -40,7 +49,7 @@
     </example>
  */
 
-ngTouch.directive('ngClick', ['$parse', '$timeout', '$rootElement',
+var ngTouchClickDirectiveFactory = ['$parse', '$timeout', '$rootElement',
     function($parse, $timeout, $rootElement) {
   var TAP_DURATION = 750; // Shorter than 750ms is a tap, longer is a taphold or drag.
   var MOVE_TOLERANCE = 12; // 12px seems to work in most mobile browsers.
@@ -284,5 +293,5 @@ ngTouch.directive('ngClick', ['$parse', '$timeout', '$rootElement',
     });
 
   };
-}]);
+}];
 

src/ngTouch/touch.js

@@ -1,5 +1,8 @@
 'use strict';
 
+/* global ngTouchClickDirectiveFactory: false,
+ */
+
 /**
  * @ngdoc module
  * @name ngTouch
@@ -28,29 +31,61 @@ function nodeName_(element) {
   return angular.lowercase(element.nodeName || (element[0] && element[0].nodeName));
 }
 
-$TouchProvider.$inject = ['$provide'];
-function $TouchProvider($provide) {
-  var useNgClickOverride = true;
+/**
+ * @ngdoc provider
+ * @name $touchProvider
+ *
+ * @description
+ * The `$touchProvider` allows enabling / disabling {@link ngTouch.ngClick ngTouch's ngClick directive}.
+ */
+$TouchProvider.$inject = ['$provide', '$compileProvider'];
+function $TouchProvider($provide, $compileProvider) {
 
-  this.useNgClickOverride = function(enabled) {
+  /**
+   * @ngdoc method
+   * @name  $touchProvider#ngClickOverrideEnabled
+   *
+   * @param {boolean=} enabled update the ngClickOverrideEnabled state if provided, otherwise just return the
+   * current ngClickOverrideEnabled state
+   * @returns {*} current value if used as getter or itself (chaining) if used as setter
+   *
+   * @kind function
+   *
+   * @description
+   * Call this method to enable/disable {@link ngTouch.ngClick ngTouch's ngClick directive}. If enabled,
+   * the default ngClick directive will be replaced by a version that eliminates the 300ms delay for
+   * click events on browser for touch-devices.
+   *
+   * The default is `false`.
+   *
+   */
+  var ngClickOverrideEnabled = false;
+  this.ngClickOverrideEnabled = function(enabled) {
     if (angular.isDefined(enabled)) {
-      useNgClickOverride = enabled;
-      return this;
-    }
-    return useNgClickOverride;
-  };
 
-  $provide.decorator('ngClickDirective', ['$delegate', function($delegate) {
-    if (useNgClickOverride) {
-      // drop the default ngClick directive
-      $delegate.shift();
-    } else {
-      // drop the ngClickOverride. Assume it is the second ngClick directive added.
-      $delegate.splice(1,1);
+      if (enabled && !ngClickOverrideEnabled) {
+        $compileProvider.directive('ngClick', ngTouchClickDirectiveFactory);
+
+        $provide.decorator('ngClickDirective', ['$delegate', function($delegate) {
+          if (ngClickOverrideEnabled) {
+            // drop the default ngClick directive
+            $delegate.shift();
+          } else {
+            // drop the ngTouch ngClick directive if the override has been re-disabled (because
+            // we cannot de-register added directives)
+            $delegate.splice(1, 1);
+          }
+
+          return $delegate;
+        }]);
+      }
+
+      ngClickOverrideEnabled = enabled;
+      return this;
     }
 
-    return $delegate;
-  }]);
+    return ngClickOverrideEnabled;
+  };
 
   this.$get = angular.noop;