ui/views/win/pen_event_processor.h

// 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 UI_VIEWS_WIN_PEN_EVENT_PROCESSOR_H_
#define UI_VIEWS_WIN_PEN_EVENT_PROCESSOR_H_

#include <windows.h>

#include <memory>

#include "ui/events/event.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/sequential_id_generator.h"
#include "ui/views/views_export.h"

namespace views {

// This class handles the processing pen event state information
// from native Windows events and returning appropriate
// ui::Events for the current state.
class VIEWS_EXPORT PenEventProcessor {
 public:
  // |id_generator| must outlive this object's lifecycle.
  PenEventProcessor(ui::SequentialIDGenerator* id_generator,
                    bool direct_manipulation_enabled);
  ~PenEventProcessor();

  // Generate an appropriate ui::Event for a given pen pointer.
  // May return nullptr if no event should be dispatched.
  std::unique_ptr<ui::Event> GenerateEvent(
      UINT message,
      UINT32 pointer_id,
      const POINTER_PEN_INFO& pen_pointer_info,
      const gfx::Point& point);

 private:
  std::unique_ptr<ui::Event> GenerateMouseEvent(
      UINT message,
      UINT32 pointer_id,
      const POINTER_INFO& pointer_info,
      const gfx::Point& point,
      const ui::PointerDetails& pointer_details);
  std::unique_ptr<ui::Event> GenerateTouchEvent(
      UINT message,
      UINT32 pointer_id,
      const POINTER_INFO& pointer_info,
      const gfx::Point& point,
      const ui::PointerDetails& pointer_details);

  ui::SequentialIDGenerator* id_generator_;
  bool direct_manipulation_enabled_;
  bool pen_in_contact_ = false;
  bool send_touch_for_pen_ = false;
  bool sent_mouse_down_ = false;
  bool sent_touch_start_ = false;

  DISALLOW_COPY_AND_ASSIGN(PenEventProcessor);
};

}  // namespace views

#endif  // UI_VIEWS_WIN_PEN_EVENT_PROCESSOR_H_