chromium/content/common/input/synthetic_gesture.h

// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_COMMON_INPUT_SYNTHETIC_GESTURE_H_
#define CONTENT_COMMON_INPUT_SYNTHETIC_GESTURE_H_

#include <memory>

#include "base/functional/callback_forward.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "content/common/content_export.h"
#include "content/common/input/synthetic_gesture_params.h"

namespace content {

class SyntheticGestureTarget;
class SyntheticGestureController;

// Abstract base class for synthetic gesture implementations. A synthetic
// gesture class is responsible for forwarding InputEvents, simulating the
// gesture, to a SyntheticGestureTarget.
//
// Adding new gesture types involved the following steps:
//   1) Create a sub-type of SyntheticGestureBase that implements the gesture.
//   2) Extend SyntheticGesture::Create with the new class.
//   3) Add at least one unit test per supported input source type (touch,
//      mouse, etc) to SyntheticGestureController unit tests. The unit tests
//      only checks basic functionality and termination. If the gesture is
//      hooked up to Telemetry its correctness can additionally be tested there.
class CONTENT_EXPORT SyntheticGesture { … };

template <class ParamType>
class SyntheticGestureBase : public SyntheticGesture { … };

}  // namespace content

#endif  // CONTENT_COMMON_INPUT_SYNTHETIC_GESTURE_H_