Repo created

libs/drape_frontend/kinetic_scroller.hpp

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+#pragma once
+
+#include "animation_system.hpp"
+
+#include "drape/pointers.hpp"
+
+#include <chrono>
+#include <deque>
+
+namespace df
+{
+class KineticScroller
+{
+public:
+  void Init(ScreenBase const & modelView);
+  void Update(ScreenBase const & modelView);
+  bool IsActive() const;
+  void Cancel();
+  drape_ptr<Animation> CreateKineticAnimation(ScreenBase const & modelView);
+
+private:
+  std::pair<m2::PointD, double> GetDirectionAndVelocity(ScreenBase const & modelView) const;
+
+  using ClockT = std::chrono::steady_clock;
+  static double GetDurationSeconds(ClockT::time_point const & t2, ClockT::time_point const & t1)
+  {
+    return std::chrono::duration_cast<std::chrono::duration<double>>(t2 - t1).count();
+  }
+
+  std::deque<std::pair<m2::PointD, ClockT::time_point>> m_points;
+  bool m_isActive = false;
+};
+}  // namespace df