ui/events/gestures/gesture_recognizer_impl_mac.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/macros.h"
   6 #include "ui/events/gestures/gesture_recognizer.h"
   7
   8 namespace ui {
   9
  10 namespace {
  11
  12 // Stub implementation of GestureRecognizer for Mac. Currently only serves to
  13 // provide a no-op implementation of TransferEventsTo().
  14 class GestureRecognizerImplMac : public GestureRecognizer {
  15  public:
  16   GestureRecognizerImplMac() {}
  17   ~GestureRecognizerImplMac() override {}
  18
  19  private:
  20   bool ProcessTouchEventPreDispatch(TouchEvent* event,
  21                                     GestureConsumer* consumer) override {
  22     return false;
  23   }
  24
  25   Gestures* AckTouchEvent(uint32 unique_event_id,
  26                           ui::EventResult result,
  27                           GestureConsumer* consumer) override {
  28     return NULL;
  29   }
  30   bool CleanupStateForConsumer(GestureConsumer* consumer) override {
  31     return false;
  32   }
  33   GestureConsumer* GetTouchLockedTarget(const TouchEvent& event) override {
  34     return NULL;
  35   }
  36   GestureConsumer* GetTargetForGestureEvent(
  37       const GestureEvent& event) override {
  38     return NULL;
  39   }
  40   GestureConsumer* GetTargetForLocation(const gfx::PointF& location,
  41                                         int source_device_id) override {
  42     return NULL;
  43   }
  44   void CancelActiveTouchesExcept(GestureConsumer* not_cancelled) override {}
  45   void TransferEventsTo(GestureConsumer* current_consumer,
  46                         GestureConsumer* new_consumer) override {}
  47   bool GetLastTouchPointForTarget(GestureConsumer* consumer,
  48                                   gfx::PointF* point) override {
  49     return false;
  50   }
  51   bool CancelActiveTouches(GestureConsumer* consumer) override { return false; }
  52   void AddGestureEventHelper(GestureEventHelper* helper) override {}
  53   void RemoveGestureEventHelper(GestureEventHelper* helper) override {}
  54
  55   DISALLOW_COPY_AND_ASSIGN(GestureRecognizerImplMac);
  56 };
  57
  58 }  // namespace
  59
  60 // static
  61 GestureRecognizer* GestureRecognizer::Get() {
  62   CR_DEFINE_STATIC_LOCAL(GestureRecognizerImplMac, instance, ());
  63   return &instance;
  64 }
  65
  66 }  // namespace ui