xbmc/input/InertialScrollingHandler.h

   1 /*
   2  *  Copyright (C) 2011-2024 Team Kodi
   3  *  This file is part of Kodi - https://kodi.tv
   4  *
   5  *  SPDX-License-Identifier: GPL-2.0-or-later
   6  *  See LICENSES/README.md for more information.
   7  */
   8
   9 #pragma once
  10
  11 #include "utils/Geometry.h"
  12 #include "utils/Vector.h"
  13
  14 #include <deque>
  15
  16 class CApplication;
  17 class CAction;
  18
  19 class CInertialScrollingHandler
  20 {
  21   friend class CApplication;
  22
  23 public:
  24   CInertialScrollingHandler();
  25
  26   bool IsScrolling() { return m_bScrolling; }
  27
  28 private:
  29   bool CheckForInertialScrolling(const CAction* action);
  30   bool ProcessInertialScroll(float frameTime);
  31
  32   /*
  33    * vars for inertial scrolling animation with gestures
  34    */
  35
  36   // flag indicating that we currently do the inertial scrolling emulation
  37   bool m_bScrolling = false;
  38
  39   // flag indicating an abort of scrolling
  40   bool m_bAborting = false;
  41
  42   CVector m_iFlickVelocity;
  43
  44   struct PanPoint
  45   {
  46     unsigned int time;
  47     CVector velocity;
  48     PanPoint(unsigned int time, CVector velocity) : time(time), velocity(velocity) {}
  49     unsigned int TimeElapsed() const;
  50   };
  51   std::deque<PanPoint> m_panPoints;
  52   CPoint m_iLastGesturePoint;
  53   CVector m_inertialDeacceleration;
  54   unsigned int m_inertialStartTime = 0;
  55   float m_timeToZero = 0.0f;
  56 };