Remove 300ms click delay

Ensure concurrent registration of single and double tap handlers works properly

src/utils/events/constants.js

@@ -43,7 +43,7 @@ export const BASIC_EVENT_ALIASES = {
 export const EVENT_RECOGNIZER_MAP = {
   click: 'tap',
   tap: 'tap',
-  doubletap: 'tap',
+  doubletap: 'doubletap',
   press: 'press',
   pinch: 'pinch',
   pinchin: 'pinch',
@@ -80,7 +80,7 @@ export const RECOGNIZERS = [
   [Swipe, {enable: false}],
   [Press, {enable: false}],
   [Tap, {event: 'doubletap', taps: 2, enable: false}],
-  [Tap, {enable: false}, null, 'doubletap']
+  [Tap, {enable: false, interval: 0}]
 ];
 
 /**

src/utils/events/event-manager.js

@@ -64,6 +64,9 @@ export default class EventManager {
         // Enable recognizer for this event.
         this.manager.get(recognizerEvent).set({enable: true});
 
+        // Handle concurrent single and double tap registration as necessary.
+        this._reconcileSingleAndDoubleTap(recognizerEvent);
+
         // Alias to a recognized gesture as necessary.
         const eventAlias = GESTURE_EVENT_ALIASES[event];
         if (eventAlias && !this.aliasedEventHandlers[event]) {
@@ -140,7 +143,28 @@ export default class EventManager {
     this.manager.emit(type, event);
   }
 
+  /**
+   * Alias one event name to another,
+   * to support events supported by Hammer.js under a different name.
+   * See constants.GESTURE_EVENT_ALIASES.
+   */
   _aliasEventHandler(eventAlias) {
     return event => this.manager.emit(eventAlias, event);
   }
+
+  /**
+   * If single and double tap are both enabled,
+   * The single tap recognizer must wait for the double tap recognizer
+   * to fail before resolving. Note that enabling both incurs a slight delay
+   * on tap/click handler resolution.
+   */
+  _reconcileSingleAndDoubleTap(event) {
+    if (event === 'tap' || event === 'doubletap') {
+      const singletapRecognizer = this.manager.get('tap');
+      const doubletapRecognizer = this.manager.get('doubletap');
+      if (singletapRecognizer.options.enable && doubletapRecognizer.options.enable) {
+        singletapRecognizer.requireFailure('doubletap');
+      }
+    }
+  }
 }