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pointer_gesture_pinch_delegate.h
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pointer_gesture_pinch_delegate.h
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// Copyright 2017 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.
#ifndef COMPONENTS_EXO_POINTER_GESTURE_PINCH_DELEGATE_H_
#define COMPONENTS_EXO_POINTER_GESTURE_PINCH_DELEGATE_H_
#include "base/time/time.h"
namespace exo {
class Pointer;
// Handles pinch event details on pointers. Used as an extension to the
// PointerDelegate.
class PointerGesturePinchDelegate {
public:
// Called at the top of the pointer's destructor, to give observers a
// chance to remove themselves.
virtual void OnPointerDestroying(Pointer* pointer) = 0;
virtual void OnPointerPinchBegin(uint32_t unique_touch_event_id,
base::TimeTicks time_stamp,
Surface* surface) = 0;
virtual void OnPointerPinchUpdate(base::TimeTicks time_stamp,
float scale) = 0;
virtual void OnPointerPinchEnd(uint32_t unique_touch_event_id,
base::TimeTicks time_stamp) = 0;
protected:
virtual ~PointerGesturePinchDelegate() {}
};
} // namespace exo
#endif // COMPONENTS_EXO_POINTER_GESTURE_PINCH_DELEGATE_H_