[drape] add GetCurrentZoom()

- add to the drape_engine and framework `GetCurrentZoom`
- make GetCurrentZoom public in the frontend_renderer

Signed-off-by: Kiryl Kaveryn <kirylkaveryn@gmail.com>

drape_frontend/drape_engine.cpp

@@ -166,6 +166,11 @@ void DrapeEngine::SetVisibleViewport(m2::RectD const & rect) const
                                   MessagePriority::Normal);
 }
 
+int DrapeEngine::GetCurrentZoomLevel() const
+{
+  return m_frontend->GetCurrentZoom();
+}
+
 void DrapeEngine::Invalidate()
 {
   m_threadCommutator->PostMessage(ThreadsCommutator::RenderThread,

drape_frontend/drape_engine.hpp

@@ -119,6 +119,8 @@ public:
 
   void SetVisibleViewport(m2::RectD const & rect) const;
 
+  int GetCurrentZoomLevel() const;
+
   void AddTouchEvent(TouchEvent const & event);
   void Scale(double factor, m2::PointD const & pxPoint, bool isAnim);
   void Move(double factorX, double factorY, bool isAnim);

drape_frontend/frontend_renderer.cpp

@@ -2524,6 +2524,12 @@ void FrontendRenderer::ChangeModelView(double autoScale, m2::PointD const & user
   AddUserEvent(make_unique_dp<FollowAndRotateEvent>(userPos, pxZero, azimuth, autoScale, parallelAnimCreator));
 }
 
+int FrontendRenderer::GetCurrentZoom() const
+{
+  ASSERT(IsValidCurrentZoom(), ());
+  return m_currentZoomLevel;
+}
+
 void FrontendRenderer::OnEnterBackground()
 {
   m_myPositionController->OnEnterBackground();

drape_frontend/frontend_renderer.hpp

@@ -145,6 +145,7 @@ public:
 
   drape_ptr<ScenarioManager> const & GetScenarioManager() const { return m_scenarioManager; }
   location::EMyPositionMode GetMyPositionMode() const { return m_myPositionController->GetCurrentMode(); }
+  int GetCurrentZoom() const;
 
   void OnEnterBackground();
 
@@ -351,12 +352,6 @@ private:
     return m_currentZoomLevel >= 0;
   }
 
-  int GetCurrentZoom() const
-  {
-    ASSERT(IsValidCurrentZoom(), ());
-    return m_currentZoomLevel;
-  }
-
   int m_currentZoomLevel = -1;
 
   ref_ptr<RequestedTiles> m_requestedTiles;

map/framework.cpp

@@ -979,6 +979,13 @@ void Framework::SetVisibleViewport(m2::RectD const & rect)
   m_drapeEngine->SetVisibleViewport(rect);
 }
 
+int Framework::GetCurrentZoomLevel() const
+{
+  if (m_drapeEngine == nullptr)
+    return scales::GetUpperComfortScale();
+  return m_drapeEngine->GetCurrentZoomLevel();
+}
+
 void Framework::ShowRect(m2::RectD const & rect, int maxScale, bool animation, bool useVisibleViewport)
 {
   if (m_drapeEngine == nullptr)

map/framework.hpp

@@ -505,6 +505,8 @@ public:
   m2::RectD GetCurrentViewport() const;
   void SetVisibleViewport(m2::RectD const & rect);
 
+  int GetCurrentZoomLevel() const;
+
   /// - Check minimal visible scale according to downloaded countries.
   void ShowRect(m2::RectD const & rect, int maxScale = -1, bool animation = true,
                 bool useVisibleViewport = false);