ui/events/gestures/gesture_recognizer_impl_mac.cc

// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/macros.h"
#include "ui/events/gestures/gesture_recognizer.h"

namespace ui {

namespace {

// Stub implementation of GestureRecognizer for Mac. Currently only serves to
// provide a no-op implementation of TransferEventsTo().
class GestureRecognizerImplMac : public GestureRecognizer {
 public:
  GestureRecognizerImplMac() {}
  ~GestureRecognizerImplMac() override {}

 private:
  bool ProcessTouchEventPreDispatch(const TouchEvent& event,
                                    GestureConsumer* consumer) override {
    return false;
  }

  Gestures* ProcessTouchEventPostDispatch(const TouchEvent& event,
                                          ui::EventResult result,
                                          GestureConsumer* consumer) override {
    return NULL;
  }
  Gestures* ProcessTouchEventOnAsyncAck(const TouchEvent& event,
                                        ui::EventResult result,
                                        GestureConsumer* consumer) override {
    return NULL;
  };
  bool CleanupStateForConsumer(GestureConsumer* consumer) override {
    return false;
  }
  GestureConsumer* GetTouchLockedTarget(const TouchEvent& event) override {
    return NULL;
  }
  GestureConsumer* GetTargetForGestureEvent(
      const GestureEvent& event) override {
    return NULL;
  }
  GestureConsumer* GetTargetForLocation(const gfx::PointF& location,
                                        int source_device_id) override {
    return NULL;
  }
  void TransferEventsTo(GestureConsumer* current_consumer,
                        GestureConsumer* new_consumer) override {}
  bool GetLastTouchPointForTarget(GestureConsumer* consumer,
                                  gfx::PointF* point) override {
    return false;
  }
  bool CancelActiveTouches(GestureConsumer* consumer) override { return false; }
  void AddGestureEventHelper(GestureEventHelper* helper) override {}
  void RemoveGestureEventHelper(GestureEventHelper* helper) override {}

  DISALLOW_COPY_AND_ASSIGN(GestureRecognizerImplMac);
};

}  // namespace

// static
GestureRecognizer* GestureRecognizer::Get() {
  CR_DEFINE_STATIC_LOCAL(GestureRecognizerImplMac, instance, ());
  return &instance;
}

}  // namespace ui