InertialScrollingHandler.h

/*
 *  Copyright (C) 2011-2024 Team Kodi
 *  This file is part of Kodi - https://kodi.tv
 *
 *  SPDX-License-Identifier: GPL-2.0-or-later
 *  See LICENSES/README.md for more information.
 */

#pragma once

#include "utils/Geometry.h"
#include "utils/Vector.h"

#include <deque>

class CApplication;
class CAction;

class CInertialScrollingHandler
{
  friend class CApplication;

public:
  CInertialScrollingHandler();

  bool IsScrolling() { return m_bScrolling; }

private:
  bool CheckForInertialScrolling(const CAction* action);
  bool ProcessInertialScroll(float frameTime);

  /*
   * vars for inertial scrolling animation with gestures
   */

  // flag indicating that we currently do the inertial scrolling emulation
  bool m_bScrolling = false;

  // flag indicating an abort of scrolling
  bool m_bAborting = false;

  CVector m_iFlickVelocity;

  struct PanPoint
  {
    unsigned int time;
    CVector velocity;
    PanPoint(unsigned int time, CVector velocity) : time(time), velocity(velocity) {}
    unsigned int TimeElapsed() const;
  };
  std::deque<PanPoint> m_panPoints;
  CPoint m_iLastGesturePoint;
  CVector m_inertialDeacceleration;
  unsigned int m_inertialStartTime = 0;
  float m_timeToZero = 0.0f;
};