UserEvent refactoring.

6 files changed, 224 insertions, 126 deletions

diff --git a/drape_frontend/drape_engine.cpp b/drape_frontend/drape_engine.cpp
index c3d8847e9b..9b2698c9b8 100644
--- a/drape_frontend/drape_engine.cpp
+++ b/drape_frontend/drape_engine.cpp
@@ -107,27 +107,27 @@ void DrapeEngine::Invalidate()
 
 void DrapeEngine::AddTouchEvent(TouchEvent const & event)
 {
-  AddUserEvent(event);
+  AddUserEvent(make_unique_dp<TouchEvent>(event));
 }
 
 void DrapeEngine::Scale(double factor, m2::PointD const & pxPoint, bool isAnim)
 {
-  AddUserEvent(ScaleEvent(factor, pxPoint, isAnim));
+  AddUserEvent(make_unique_dp<ScaleEvent>(factor, pxPoint, isAnim));
 }
 
 void DrapeEngine::SetModelViewCenter(m2::PointD const & centerPt, int zoom, bool isAnim)
 {
-  AddUserEvent(SetCenterEvent(centerPt, zoom, isAnim));
+  AddUserEvent(make_unique_dp<SetCenterEvent>(centerPt, zoom, isAnim));
 }
 
 void DrapeEngine::SetModelViewRect(m2::RectD const & rect, bool applyRotation, int zoom, bool isAnim)
 {
-  AddUserEvent(SetRectEvent(rect, applyRotation, zoom, isAnim));
+  AddUserEvent(make_unique_dp<SetRectEvent>(rect, applyRotation, zoom, isAnim));
 }
 
 void DrapeEngine::SetModelViewAnyRect(m2::AnyRectD const & rect, bool isAnim)
 {
-  AddUserEvent(SetAnyRectEvent(rect, isAnim));
+  AddUserEvent(make_unique_dp<SetAnyRectEvent>(rect, isAnim));
 }
 
 void DrapeEngine::ClearUserMarksLayer(df::TileKey const & tileKey)
@@ -194,9 +194,9 @@ void DrapeEngine::RecacheGui(bool needResetOldGui)
                                   MessagePriority::High);
 }
 
-void DrapeEngine::AddUserEvent(UserEvent const & e)
+void DrapeEngine::AddUserEvent(drape_ptr<UserEvent> && e)
 {
-  m_frontend->AddUserEvent(e);
+  m_frontend->AddUserEvent(move(e));
 }
 
 void DrapeEngine::ModelViewChanged(ScreenBase const & screen)
@@ -228,7 +228,7 @@ void DrapeEngine::ResizeImpl(int w, int h)
 {
   gui::DrapeGui::Instance().SetSurfaceSize(m2::PointF(w, h));
   m_viewport.SetViewport(0, 0, w, h);
-  AddUserEvent(ResizeEvent(w, h));
+  AddUserEvent(make_unique_dp<ResizeEvent>(w, h));
 }
 
 void DrapeEngine::SetCompassInfo(location::CompassInfo const & info)
diff --git a/drape_frontend/drape_engine.hpp b/drape_frontend/drape_engine.hpp
index eede48e993..12c86481cc 100644
--- a/drape_frontend/drape_engine.hpp
+++ b/drape_frontend/drape_engine.hpp
@@ -157,7 +157,7 @@ public:
                           TRequestSymbolsSizeCallback const & callback);
 
 private:
-  void AddUserEvent(UserEvent const & e);
+  void AddUserEvent(drape_ptr<UserEvent> && e);
   void ModelViewChanged(ScreenBase const & screen);
 
   void MyPositionModeChanged(location::EMyPositionMode mode, bool routingActive);
diff --git a/drape_frontend/frontend_renderer.cpp b/drape_frontend/frontend_renderer.cpp
index 5939d93345..161fdb9026 100755
--- a/drape_frontend/frontend_renderer.cpp
+++ b/drape_frontend/frontend_renderer.cpp
@@ -627,7 +627,7 @@ void FrontendRenderer::AcceptMessage(ref_ptr<Message> message)
 
   case Message::EnablePerspective:
     {
-      AddUserEvent(SetAutoPerspectiveEvent(true /* isAutoPerspective */));
+      AddUserEvent(make_unique_dp<SetAutoPerspectiveEvent>(true /* isAutoPerspective */));
       break;
     }
 
@@ -640,7 +640,7 @@ void FrontendRenderer::AcceptMessage(ref_ptr<Message> message)
       if (m_enablePerspectiveInNavigation == msg->AllowPerspective() &&
           m_enablePerspectiveInNavigation != screen.isPerspective())
       {
-        AddUserEvent(SetAutoPerspectiveEvent(m_enablePerspectiveInNavigation));
+        AddUserEvent(make_unique_dp<SetAutoPerspectiveEvent>(m_enablePerspectiveInNavigation));
       }
 #endif
 
@@ -657,7 +657,7 @@ void FrontendRenderer::AcceptMessage(ref_ptr<Message> message)
         m_myPositionController->EnablePerspectiveInRouting(m_enablePerspectiveInNavigation);
         if (m_myPositionController->IsInRouting())
         {
-          AddUserEvent(SetAutoPerspectiveEvent(m_enablePerspectiveInNavigation));
+          AddUserEvent(make_unique_dp<SetAutoPerspectiveEvent>(m_enablePerspectiveInNavigation));
         }
       }
       break;
@@ -722,7 +722,7 @@ void FrontendRenderer::AcceptMessage(ref_ptr<Message> message)
           int zoom = kDoNotChangeZoom;
           if (m_currentZoomLevel < scales::GetAddNewPlaceScale())
             zoom = scales::GetAddNewPlaceScale();
-          AddUserEvent(SetCenterEvent(pt, zoom, true));
+          AddUserEvent(make_unique_dp<SetCenterEvent>(pt, zoom, true));
         }
       }
       break;
@@ -759,7 +759,7 @@ void FrontendRenderer::FollowRoute(int preferredZoomLevel, int preferredZoomLeve
                                           enableAutoZoom);
 
   if (m_enablePerspectiveInNavigation)
-    AddUserEvent(SetAutoPerspectiveEvent(true /* isAutoPerspective */));
+    AddUserEvent(make_unique_dp<SetAutoPerspectiveEvent>(true /* isAutoPerspective */));
 
   m_overlayTree->SetFollowingMode(true);
 }
@@ -940,7 +940,7 @@ void FrontendRenderer::PullToBoundArea(bool randomPlace, bool applyZoom)
     int zoom = kDoNotChangeZoom;
     if (applyZoom && m_currentZoomLevel < scales::GetAddNewPlaceScale())
       zoom = scales::GetAddNewPlaceScale();
-    AddUserEvent(SetCenterEvent(dest, zoom, true));
+    AddUserEvent(make_unique_dp<SetCenterEvent>(dest, zoom, true));
   }
 }
 
@@ -1254,7 +1254,7 @@ void FrontendRenderer::RefreshBgColor()
 
 void FrontendRenderer::DisablePerspective()
 {
-  AddUserEvent(SetAutoPerspectiveEvent(false /* isAutoPerspective */));
+  AddUserEvent(make_unique_dp<SetAutoPerspectiveEvent>(false /* isAutoPerspective */));
 }
 
 void FrontendRenderer::CheckIsometryMinScale(ScreenBase const & screen)
@@ -1316,13 +1316,14 @@ void FrontendRenderer::OnForceTap(m2::PointD const & pt)
 
 void FrontendRenderer::OnDoubleTap(m2::PointD const & pt)
 {
-  m_userEventStream.AddEvent(ScaleEvent(2.0 /* scale factor */, pt, true /* animated */));
+  m_userEventStream.AddEvent(make_unique_dp<ScaleEvent>(2.0 /* scale factor */, pt, true /* animated */));
 }
 
 void FrontendRenderer::OnTwoFingersTap()
 {
   ScreenBase const & screen = m_userEventStream.GetCurrentScreen();
-  m_userEventStream.AddEvent(ScaleEvent(0.5 /* scale factor */, screen.PixelRect().Center(), true /* animated */));
+  m_userEventStream.AddEvent(make_unique_dp<ScaleEvent>(0.5 /* scale factor */, screen.PixelRect().Center(),
+                                                        true /* animated */));
 }
 
 bool FrontendRenderer::OnSingleTouchFiltrate(m2::PointD const & pt, TouchEvent::ETouchType type)
@@ -1596,9 +1597,9 @@ void FrontendRenderer::ReleaseResources()
   m_contextFactory->getDrawContext()->doneCurrent();
 }
 
-void FrontendRenderer::AddUserEvent(UserEvent const & event)
+void FrontendRenderer::AddUserEvent(drape_ptr<UserEvent> && event)
 {
-  m_userEventStream.AddEvent(event);
+  m_userEventStream.AddEvent(move(event));
   if (IsInInfinityWaiting())
     CancelMessageWaiting();
 }
@@ -1610,28 +1611,28 @@ void FrontendRenderer::PositionChanged(m2::PointD const & position)
 
 void FrontendRenderer::ChangeModelView(m2::PointD const & center, int zoomLevel)
 {
-  AddUserEvent(SetCenterEvent(center, zoomLevel, true));
+  AddUserEvent(make_unique_dp<SetCenterEvent>(center, zoomLevel, true));
 }
 
 void FrontendRenderer::ChangeModelView(double azimuth)
 {
-  AddUserEvent(RotateEvent(azimuth));
+  AddUserEvent(make_unique_dp<RotateEvent>(azimuth));
 }
 
 void FrontendRenderer::ChangeModelView(m2::RectD const & rect)
 {
-  AddUserEvent(SetRectEvent(rect, true, kDoNotChangeZoom, true));
+  AddUserEvent(make_unique_dp<SetRectEvent>(rect, true, kDoNotChangeZoom, true));
 }
 
 void FrontendRenderer::ChangeModelView(m2::PointD const & userPos, double azimuth,
                                        m2::PointD const & pxZero, int preferredZoomLevel)
 {
-  AddUserEvent(FollowAndRotateEvent(userPos, pxZero, azimuth, preferredZoomLevel, true));
+  AddUserEvent(make_unique_dp<FollowAndRotateEvent>(userPos, pxZero, azimuth, preferredZoomLevel, true));
 }
 
 void FrontendRenderer::ChangeModelView(double autoScale, m2::PointD const & userPos, double azimuth, m2::PointD const & pxZero)
 {
-  AddUserEvent(FollowAndRotateEvent(userPos, pxZero, azimuth, autoScale));
+  AddUserEvent(make_unique_dp<FollowAndRotateEvent>(userPos, pxZero, azimuth, autoScale));
 }
 
 ScreenBase const & FrontendRenderer::ProcessEvents(bool & modelViewChanged, bool & viewportChanged)
diff --git a/drape_frontend/frontend_renderer.hpp b/drape_frontend/frontend_renderer.hpp
index ab99ec0954..9ae629e523 100755
--- a/drape_frontend/frontend_renderer.hpp
+++ b/drape_frontend/frontend_renderer.hpp
@@ -136,7 +136,7 @@ public:
   void AfterDrawFrame();
 #endif
 
-  void AddUserEvent(UserEvent const & event);
+  void AddUserEvent(drape_ptr<UserEvent> && event);
 
   /// MyPositionController::Listener
   void PositionChanged(m2::PointD const & position) override;
diff --git a/drape_frontend/user_event_stream.cpp b/drape_frontend/user_event_stream.cpp
index 2402f6c540..9f93b133e5 100644
--- a/drape_frontend/user_event_stream.cpp
+++ b/drape_frontend/user_event_stream.cpp
@@ -70,6 +70,16 @@ char const * UserEventStream::END_DOUBLE_TAP_AND_HOLD = "EndDoubleTapAndHold";
 
 uint8_t const TouchEvent::INVALID_MASKED_POINTER = 0xFF;
 
+void TouchEvent::SetFirstTouch(const Touch & touch)
+{
+  m_touches[0] = touch;
+}
+
+void TouchEvent::SetSecondTouch(const Touch & touch)
+{
+  m_touches[1] = touch;
+}
+
 void TouchEvent::PrepareTouches(array<Touch, 2> const & previousTouches)
 {
   if (GetValidTouchesCount(m_touches) == 2 && GetValidTouchesCount(previousTouches) > 0)
@@ -129,17 +139,16 @@ UserEventStream::UserEventStream()
 {
 }
 
-void UserEventStream::AddEvent(UserEvent const & event)
+void UserEventStream::AddEvent(drape_ptr<UserEvent> && event)
 {
   lock_guard<mutex> guard(m_lock);
   UNUSED_VALUE(guard);
-  m_events.push_back(event);
+  m_events.emplace_back(move(event));
 }
 
 ScreenBase const & UserEventStream::ProcessEvents(bool & modelViewChanged, bool & viewportChanged)
 {
-  list<UserEvent> events;
-
+  TEventsList events;
   {
     lock_guard<mutex> guard(m_lock);
     UNUSED_VALUE(guard);
@@ -149,64 +158,89 @@ ScreenBase const & UserEventStream::ProcessEvents(bool & modelViewChanged, bool
   m2::RectD const prevPixelRect = GetCurrentScreen().PixelRect();
 
   m_modelViewChanged = !events.empty() || m_state == STATE_SCALE || m_state == STATE_DRAG;
-  for (UserEvent const & e : events)
+  for (auto const & e : events)
   {
     bool breakAnim = false;
 
-    switch (e.m_type)
+    switch (e->GetType())
     {
-    case UserEvent::EVENT_SCALE:
-      breakAnim = SetScale(e.m_scaleEvent.m_pxPoint, e.m_scaleEvent.m_factor, e.m_scaleEvent.m_isAnim);
-      TouchCancel(m_touches);
+    case UserEvent::Scale:
+      {
+        ref_ptr<ScaleEvent> scaleEvent = make_ref(e);
+        breakAnim = SetScale(scaleEvent->GetPxPoint(), scaleEvent->GetFactor(), scaleEvent->IsAnim());
+        TouchCancel(m_touches);
+      }
       break;
-    case UserEvent::EVENT_RESIZE:
-      m_navigator.OnSize(e.m_resize.m_width, e.m_resize.m_height);
-      breakAnim = true;
-      TouchCancel(m_touches);
-      if (m_state == STATE_DOUBLE_TAP_HOLD)
-        EndDoubleTapAndHold(m_touches[0]);
+    case UserEvent::Resize:
+      {
+        ref_ptr<ResizeEvent> resizeEvent = make_ref(e);
+        m_navigator.OnSize(resizeEvent->GetWidth(), resizeEvent->GetHeight());
+        breakAnim = true;
+        TouchCancel(m_touches);
+        if (m_state == STATE_DOUBLE_TAP_HOLD)
+          EndDoubleTapAndHold(m_touches[0]);
+      }
       break;
-    case UserEvent::EVENT_SET_ANY_RECT:
-      breakAnim = SetRect(e.m_anyRect.m_rect, e.m_anyRect.m_isAnim);
-      TouchCancel(m_touches);
+    case UserEvent::SetAnyRect:
+      {
+        ref_ptr<SetAnyRectEvent> anyRectEvent = make_ref(e);
+        breakAnim = SetRect(anyRectEvent->GetRect(), anyRectEvent->IsAnim());
+        TouchCancel(m_touches);
+      }
       break;
-    case UserEvent::EVENT_SET_RECT:
-      breakAnim = SetRect(e.m_rectEvent.m_rect, e.m_rectEvent.m_zoom, e.m_rectEvent.m_applyRotation, e.m_rectEvent.m_isAnim);
-      TouchCancel(m_touches);
+    case UserEvent::SetRect:
+      {
+        ref_ptr<SetRectEvent> rectEvent = make_ref(e);
+        breakAnim = SetRect(rectEvent->GetRect(), rectEvent->GetZoom(),
+                            rectEvent->GetApplyRotation(), rectEvent->IsAnim());
+        TouchCancel(m_touches);
+      }
       break;
-    case UserEvent::EVENT_SET_CENTER:
-      breakAnim = SetCenter(e.m_centerEvent.m_center, e.m_centerEvent.m_zoom, e.m_centerEvent.m_isAnim);
-      TouchCancel(m_touches);
+    case UserEvent::SetCenter:
+      {
+        ref_ptr<SetCenterEvent> centerEvent = make_ref(e);
+        breakAnim = SetCenter(centerEvent->GetCenter(), centerEvent->GetZoom(), centerEvent->IsAnim());
+        TouchCancel(m_touches);
+      }
       break;
-    case UserEvent::EVENT_TOUCH:
-      breakAnim = ProcessTouch(e.m_touchEvent);
+    case UserEvent::EventTouch:
+      {
+        ref_ptr<TouchEvent> touchEvent = make_ref(e);
+        breakAnim = ProcessTouch(*touchEvent.get());
+      }
       break;
-    case UserEvent::EVENT_ROTATE:
+    case UserEvent::Rotate:
       {
+        ref_ptr<RotateEvent> rotateEvent = make_ref(e);
         ScreenBase const & screen = m_navigator.Screen();
         if (screen.isPerspective())
         {
           m2::PointD pt = screen.PixelRectIn3d().Center();
           breakAnim = SetFollowAndRotate(screen.PtoG(screen.P3dtoP(pt)), pt,
-                                         e.m_rotate.m_targetAzimut, kDoNotChangeZoom, kDoNotAutoZoom,
+                                         rotateEvent->GetTargetAzimuth(), kDoNotChangeZoom, kDoNotAutoZoom,
                                          true /* isAnim */, false /* isAutoScale */);
         }
         else
         {
           m2::AnyRectD dstRect = GetTargetRect();
-          dstRect.SetAngle(e.m_rotate.m_targetAzimut);
+          dstRect.SetAngle(rotateEvent->GetTargetAzimuth());
           breakAnim = SetRect(dstRect, true);
         }
       }
       break;
-    case UserEvent::EVENT_FOLLOW_AND_ROTATE:
-      breakAnim = SetFollowAndRotate(e.m_followAndRotate.m_userPos, e.m_followAndRotate.m_pixelZero,
-                                     e.m_followAndRotate.m_azimuth, e.m_followAndRotate.m_preferredZoomLevel,
-                                     e.m_followAndRotate.m_autoScale,
-                                     e.m_followAndRotate.m_isAnim, e.m_followAndRotate.m_isAutoScale);
+    case UserEvent::FollowAndRotate:
+      {
+        ref_ptr<FollowAndRotateEvent> followEvent = make_ref(e);
+        breakAnim = SetFollowAndRotate(followEvent->GetUserPos(), followEvent->GetPixelZero(),
+                                       followEvent->GetAzimuth(), followEvent->GetPreferredZoomLelel(),
+                                       followEvent->GetAutoScale(), followEvent->IsAnim(), followEvent->IsAutoScale());
+      }
       break;
-    case UserEvent::EVENT_AUTO_PERSPECTIVE:
-      SetAutoPerspective(e.m_autoPerspective.m_isAutoPerspective);
+    case UserEvent::AutoPerspective:
+      {
+        ref_ptr<SetAutoPerspectiveEvent> perspectiveEvent = make_ref(e);
+        SetAutoPerspective(perspectiveEvent->IsAutoPerspective());
+      }
       break;
     default:
       ASSERT(false, ());
@@ -515,25 +549,25 @@ m2::AnyRectD UserEventStream::GetTargetRect()
 
 bool UserEventStream::ProcessTouch(TouchEvent const & touch)
 {
-  ASSERT(touch.m_touches[0].m_id != -1, ());
+  ASSERT(touch.GetFirstTouch().m_id != -1, ());
 
   TouchEvent touchEvent = touch;
   touchEvent.PrepareTouches(m_touches);
   bool isMapTouch = false;
 
-  switch (touchEvent.m_type)
+  switch (touchEvent.GetTouchType())
   {
   case TouchEvent::TOUCH_DOWN:
-    isMapTouch = TouchDown(touchEvent.m_touches);
+    isMapTouch = TouchDown(touchEvent.GetTouches());
     break;
   case TouchEvent::TOUCH_MOVE:
-    isMapTouch = TouchMove(touchEvent.m_touches, touch.m_timeStamp);
+    isMapTouch = TouchMove(touchEvent.GetTouches(), touch.GetTimeStamp());
     break;
   case TouchEvent::TOUCH_CANCEL:
-    isMapTouch = TouchCancel(touchEvent.m_touches);
+    isMapTouch = TouchCancel(touchEvent.GetTouches());
     break;
   case TouchEvent::TOUCH_UP:
-    isMapTouch = TouchUp(touchEvent.m_touches);
+    isMapTouch = TouchUp(touchEvent.GetTouches());
     break;
   default:
     ASSERT(false, ());
diff --git a/drape_frontend/user_event_stream.hpp b/drape_frontend/user_event_stream.hpp
index 9889d5ba7a..73690c1a5f 100644
--- a/drape_frontend/user_event_stream.hpp
+++ b/drape_frontend/user_event_stream.hpp
@@ -23,6 +23,26 @@ namespace df
 int const kDoNotChangeZoom = -1;
 double const kDoNotAutoZoom = -1.0;
 
+class UserEvent
+{
+public:
+  enum EEventType
+  {
+    EventTouch,
+    Scale,
+    SetCenter,
+    SetRect,
+    SetAnyRect,
+    Resize,
+    Rotate,
+    FollowAndRotate,
+    AutoPerspective
+  };
+
+  virtual ~UserEvent() {}
+  virtual EEventType GetType() const = 0;
+};
+
 struct Touch
 {
   m2::PointF m_location = m2::PointF::Zero();
@@ -30,10 +50,9 @@ struct Touch
   float m_force = 0.0; // relative force of touch [0.0 - 1.0]
 };
 
-struct TouchEvent
+class TouchEvent : public UserEvent
 {
-  static uint8_t const INVALID_MASKED_POINTER;
-
+public:
   TouchEvent()
     : m_type(TOUCH_CANCEL)
     , m_timeStamp(my::Timer::LocalTime())
@@ -49,9 +68,22 @@ struct TouchEvent
     TOUCH_CANCEL
   };
 
-  ETouchType m_type;
-  array<Touch, 2> m_touches; // array of all touches
-  double m_timeStamp; // seconds
+  static uint8_t const INVALID_MASKED_POINTER;
+
+  EEventType GetType() const override { return UserEvent::EventTouch; }
+
+  ETouchType GetTouchType() const { return m_type; }
+  void SetTouchType(ETouchType touchType) { m_type = touchType; }
+
+  double GetTimeStamp() const { return m_timeStamp; }
+
+  array<Touch, 2> const & GetTouches() const { return m_touches; }
+
+  Touch const & GetFirstTouch() const { return m_touches[0]; }
+  Touch const & GetSecondTouch() const { return m_touches[1]; }
+
+  void SetFirstTouch(Touch const & touch);
+  void SetSecondTouch(Touch const & touch);
 
   void PrepareTouches(array<Touch, 2> const & previousToches);
 
@@ -70,11 +102,16 @@ struct TouchEvent
 
 private:
   void Swap();
+
+  ETouchType m_type;
+  array<Touch, 2> m_touches; // array of all touches
+  double m_timeStamp; // seconds
   uint16_t m_pointersMask;
 };
 
-struct ScaleEvent
+class ScaleEvent : public UserEvent
 {
+public:
   ScaleEvent(double factor, m2::PointD const & pxPoint, bool isAnim)
     : m_factor(factor)
     , m_pxPoint(pxPoint)
@@ -82,13 +119,21 @@ struct ScaleEvent
   {
   }
 
+  EEventType GetType() const override { return UserEvent::Scale; }
+
+  double GetFactor() const { return m_factor; }
+  m2::PointD const & GetPxPoint() const { return m_pxPoint; }
+  bool IsAnim() const { return m_isAnim; }
+
+private:
   double m_factor;
   m2::PointD m_pxPoint;
   bool m_isAnim;
 };
 
-struct SetCenterEvent
+class SetCenterEvent : public UserEvent
 {
+public:
   SetCenterEvent(m2::PointD const & center, int zoom, bool isAnim)
     : m_center(center)
     , m_zoom(zoom)
@@ -96,13 +141,21 @@ struct SetCenterEvent
   {
   }
 
+  EEventType GetType() const override { return UserEvent::SetCenter; }
+
+  m2::PointD const & GetCenter() const { return m_center; }
+  int GetZoom() const { return m_zoom; }
+  bool IsAnim() const { return m_isAnim; }
+
+private:
   m2::PointD m_center; // center point in mercator
   int m_zoom; // if zoom == -1, then zoom level will'n change
   bool m_isAnim;
 };
 
-struct SetRectEvent
+class SetRectEvent : public UserEvent
 {
+public:
   SetRectEvent(m2::RectD const & rect, bool rotate, int zoom, bool isAnim)
     : m_rect(rect)
     , m_applyRotation(rotate)
@@ -111,25 +164,41 @@ struct SetRectEvent
   {
   }
 
+  EEventType GetType() const override { return UserEvent::SetRect; }
+
+  m2::RectD const & GetRect() const { return m_rect; }
+  bool GetApplyRotation() const { return m_applyRotation; }
+  int GetZoom() const { return m_zoom; }
+  bool IsAnim() const { return m_isAnim; }
+
+private:
   m2::RectD m_rect; // destination mercator rect
   bool m_applyRotation; // if true, current rotation will be apply to m_rect
   int m_zoom; // if zoom == -1, then zoom level will'n change
   bool m_isAnim;
 };
 
-struct SetAnyRectEvent
+class SetAnyRectEvent : public UserEvent
 {
+public:
   SetAnyRectEvent(m2::AnyRectD const & rect, bool isAnim)
     : m_rect(rect)
     , m_isAnim(isAnim)
   {}
 
+  EEventType GetType() const override { return UserEvent::SetAnyRect; }
+
+  m2::AnyRectD const & GetRect() const { return m_rect; }
+  bool IsAnim() const { return m_isAnim; }
+
+private:
   m2::AnyRectD m_rect;  // destination mercator rect
   bool m_isAnim;
 };
 
-struct FollowAndRotateEvent
+class FollowAndRotateEvent : public UserEvent
 {
+public:
   FollowAndRotateEvent(m2::PointD const & userPos, m2::PointD const & pixelZero,
                        double azimuth, double autoScale)
     : m_userPos(userPos)
@@ -143,7 +212,8 @@ struct FollowAndRotateEvent
   }
 
   FollowAndRotateEvent(m2::PointD const & userPos, m2::PointD const & pixelZero,
-                       double azimuth, int preferredZoomLevel, bool isAnim)
+                       double azimuth, int preferredZoomLevel,
+                       bool isAnim)
     : m_userPos(userPos)
     , m_pixelZero(pixelZero)
     , m_azimuth(azimuth)
@@ -153,6 +223,17 @@ struct FollowAndRotateEvent
     , m_isAnim(isAnim)
   {}
 
+  EEventType GetType() const override { return UserEvent::FollowAndRotate; }
+
+  m2::PointD const & GetUserPos() const { return m_userPos; }
+  m2::PointD const & GetPixelZero() const { return m_pixelZero; }
+  double GetAzimuth() const { return m_azimuth; }
+  int GetPreferredZoomLelel() const { return m_preferredZoomLevel; }
+  double GetAutoScale() const { return m_autoScale; }
+  bool IsAutoScale() const { return m_isAutoScale; }
+  bool IsAnim() const { return m_isAnim; }
+
+private:
   m2::PointD m_userPos;
   m2::PointD m_pixelZero;
   double m_azimuth;
@@ -162,68 +243,49 @@ struct FollowAndRotateEvent
   bool m_isAnim;
 };
 
-struct SetAutoPerspectiveEvent
+class SetAutoPerspectiveEvent : public UserEvent
 {
+public:
   SetAutoPerspectiveEvent(bool isAutoPerspective)
     : m_isAutoPerspective(isAutoPerspective)
   {}
 
+  EEventType GetType() const override { return UserEvent::AutoPerspective; }
+
+  bool IsAutoPerspective() const { return m_isAutoPerspective; }
+
+private:
   bool m_isAutoPerspective;
 };
 
-struct RotateEvent
+class RotateEvent : public UserEvent
 {
-  RotateEvent(double targetAzimut) : m_targetAzimut(targetAzimut) {}
+public:
+  RotateEvent(double targetAzimut)
+    : m_targetAzimut(targetAzimut)
+  {}
 
+  EEventType GetType() const override { return UserEvent::Rotate; }
+
+  double GetTargetAzimuth() const { return m_targetAzimut; }
+
+private:
   double m_targetAzimut;
 };
 
-struct ResizeEvent
+class ResizeEvent : public UserEvent
 {
+public:
   ResizeEvent(uint32_t w, uint32_t h) : m_width(w), m_height(h) {}
 
-  uint32_t m_width;
-  uint32_t m_height;
-};
+  EEventType GetType() const override { return UserEvent::Resize; }
 
-struct UserEvent
-{
-  enum EEventType
-  {
-    EVENT_TOUCH,
-    EVENT_SCALE,
-    EVENT_SET_CENTER,
-    EVENT_SET_RECT,
-    EVENT_SET_ANY_RECT,
-    EVENT_RESIZE,
-    EVENT_ROTATE,
-    EVENT_FOLLOW_AND_ROTATE,
-    EVENT_AUTO_PERSPECTIVE
-  };
+  uint32_t GetWidth() const { return m_width; }
+  uint32_t GetHeight() const { return m_height; }
 
-  UserEvent(TouchEvent const & e) : m_type(EVENT_TOUCH) { m_touchEvent = e; }
-  UserEvent(ScaleEvent const & e) : m_type(EVENT_SCALE) { m_scaleEvent = e; }
-  UserEvent(SetCenterEvent const & e) : m_type(EVENT_SET_CENTER) { m_centerEvent = e; }
-  UserEvent(SetRectEvent const & e) : m_type(EVENT_SET_RECT) { m_rectEvent = e; }
-  UserEvent(SetAnyRectEvent const & e) : m_type(EVENT_SET_ANY_RECT) { m_anyRect = e; }
-  UserEvent(ResizeEvent const & e) : m_type(EVENT_RESIZE) { m_resize = e; }
-  UserEvent(RotateEvent const & e) : m_type(EVENT_ROTATE) { m_rotate = e; }
-  UserEvent(FollowAndRotateEvent const & e) : m_type(EVENT_FOLLOW_AND_ROTATE) { m_followAndRotate = e; }
-  UserEvent(SetAutoPerspectiveEvent const & e) : m_type(EVENT_AUTO_PERSPECTIVE) { m_autoPerspective = e; }
-
-  EEventType m_type;
-  union
-  {
-    TouchEvent m_touchEvent;
-    ScaleEvent m_scaleEvent;
-    SetCenterEvent m_centerEvent;
-    SetRectEvent m_rectEvent;
-    SetAnyRectEvent m_anyRect;
-    ResizeEvent m_resize;
-    RotateEvent m_rotate;
-    FollowAndRotateEvent m_followAndRotate;
-    SetAutoPerspectiveEvent m_autoPerspective;
-  };
+private:
+  uint32_t m_width;
+  uint32_t m_height;
 };
 
 class UserEventStream
@@ -256,7 +318,7 @@ public:
   };
 
   UserEventStream();
-  void AddEvent(UserEvent const & event);
+  void AddEvent(drape_ptr<UserEvent> && event);
   ScreenBase const & ProcessEvents(bool & modelViewChanged, bool & viewportChanged);
   ScreenBase const & GetCurrentScreen() const;
 
@@ -351,7 +413,8 @@ private:
 
   bool CheckDrag(array<Touch, 2> const & touches, double threshold) const;
 
-  list<UserEvent> m_events;
+  using TEventsList = list<drape_ptr<UserEvent>>;
+  TEventsList m_events;
   mutable mutex m_lock;
 
   Navigator m_navigator;