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* AckAsyncTouchEvent(const TouchEvent& event,
  26                                ui::EventResult result,
  27                                GestureConsumer* consumer) override {
  28     return NULL;
  29   }
  30   Gestures* AckSyncTouchEvent(const uint64 unique_event_id,
  31                               ui::EventResult result,
  32                               GestureConsumer* consumer) override {
  33     return NULL;
  34   }
  35   bool CleanupStateForConsumer(GestureConsumer* consumer) override {
  36     return false;
  37   }
  38   GestureConsumer* GetTouchLockedTarget(const TouchEvent& event) override {
  39     return NULL;
  40   }
  41   GestureConsumer* GetTargetForGestureEvent(
  42       const GestureEvent& event) override {
  43     return NULL;
  44   }
  45   GestureConsumer* GetTargetForLocation(const gfx::PointF& location,
  46                                         int source_device_id) override {
  47     return NULL;
  48   }
  49   void TransferEventsTo(GestureConsumer* current_consumer,
  50                         GestureConsumer* new_consumer) override {}
  51   bool GetLastTouchPointForTarget(GestureConsumer* consumer,
  52                                   gfx::PointF* point) override {
  53     return false;
  54   }
  55   bool CancelActiveTouches(GestureConsumer* consumer) override { return false; }
  56   void AddGestureEventHelper(GestureEventHelper* helper) override {}
  57   void RemoveGestureEventHelper(GestureEventHelper* helper) override {}
  58
  59   DISALLOW_COPY_AND_ASSIGN(GestureRecognizerImplMac);
  60 };
  61
  62 }  // namespace
  63
  64 // static
  65 GestureRecognizer* GestureRecognizer::Get() {
  66   CR_DEFINE_STATIC_LOCAL(GestureRecognizerImplMac, instance, ());
  67   return &instance;
  68 }
  69
  70 }  // namespace ui