Affordance cell reference removed from TrackView

Subclasses should provide instances instead

(cherry picked from audacity commit bc8c6d4ccc6ffffa1fb1b30f3a9a5fe578f74ec1)

Signed-off-by: akleja <storspov@gmail.com>

src/tracks/playabletrack/notetrack/ui/NoteTrackView.cpp

@@ -76,9 +76,13 @@ std::shared_ptr<TrackVRulerControls> NoteTrackView::DoGetVRulerControls()
 #define TIME_TO_X(t) (zoomInfo.TimeToPosition((t), rect.x))
 #define X_TO_TIME(xx) (zoomInfo.PositionToTime((xx), rect.x))
 
-std::shared_ptr<CommonTrackCell> NoteTrackView::DoGetAffordanceControls()
+std::shared_ptr<CommonTrackCell> NoteTrackView::GetAffordanceControls()
 {
-   return std::make_shared<NoteTrackAffordanceControls>(DoFindTrack());
+   if (mpAffordanceCellControl == nullptr)
+   {
+      mpAffordanceCellControl = std::make_shared<NoteTrackAffordanceControls>(DoFindTrack());
+   }
+   return mpAffordanceCellControl;
 }
 
 namespace {

src/tracks/playabletrack/notetrack/ui/NoteTrackView.h

@@ -25,7 +25,7 @@ public:
 
 private:
    std::shared_ptr<TrackVRulerControls> DoGetVRulerControls() override;
-   std::shared_ptr<CommonTrackCell> DoGetAffordanceControls() override;
+   std::shared_ptr<CommonTrackCell> GetAffordanceControls() override;
 
    std::vector<UIHandlePtr> DetailedHitTest
       (const TrackPanelMouseState &state,
@@ -36,5 +36,7 @@ private:
    void Draw(
       TrackPanelDrawingContext &context,
       const wxRect &rect, unsigned iPass ) override;
+
+   std::shared_ptr<CommonTrackCell> mpAffordanceCellControl;
 };
 #endif

src/tracks/playabletrack/wavetrack/ui/WaveTrackView.cpp

@@ -1085,9 +1085,9 @@ WaveTrackView::GetAllSubViews()
    return results;
 }
 
-std::shared_ptr<CommonTrackCell> WaveTrackView::DoGetAffordanceControls()
+std::shared_ptr<CommonTrackCell> WaveTrackView::GetAffordanceControls()
 {
-   return std::make_shared<WaveTrackAffordanceControls>(FindTrack());
+    return DoGetAffordance(FindTrack());
 }
 
 void WaveTrackView::DoSetMinimized( bool minimized )
@@ -1101,6 +1101,13 @@ void WaveTrackView::DoSetMinimized( bool minimized )
    } );
 }
 
+std::shared_ptr<CommonTrackCell> WaveTrackView::DoGetAffordance(const std::shared_ptr<Track>& track)
+{
+    if (mpAffordanceCellControl == nullptr)
+        mpAffordanceCellControl = std::make_shared<WaveTrackAffordanceControls>(track);
+    return mpAffordanceCellControl;
+}
+
 using DoGetWaveTrackView = DoGetView::Override< WaveTrack >;
 template<> template<> auto DoGetWaveTrackView::Implementation() -> Function {
    return [](WaveTrack &track) {

src/tracks/playabletrack/wavetrack/ui/WaveTrackView.h

@@ -158,7 +158,7 @@ private:
    Refinement GetSubViews(const wxRect& rect) override;
 
 protected:
-   std::shared_ptr<CommonTrackCell> DoGetAffordanceControls() override;
+   std::shared_ptr<CommonTrackCell> GetAffordanceControls() override;
 
    void DoSetMinimized( bool minimized ) override;
 
@@ -169,6 +169,11 @@ protected:
    mutable wxCoord mLastHeight{};
 
    bool mMultiView{ false };
+
+private:
+   std::shared_ptr<CommonTrackCell> DoGetAffordance(const std::shared_ptr<Track>& track);
+
+   std::shared_ptr<CommonTrackCell> mpAffordanceCellControl;
 };
 
 // Helper for drawing routines

src/tracks/ui/TrackView.cpp

@@ -141,13 +141,6 @@ std::shared_ptr<const TrackVRulerControls> TrackView::GetVRulerControls() const
    return const_cast< TrackView* >( this )->GetVRulerControls();
 }
 
-std::shared_ptr<CommonTrackCell> TrackView::GetAffordanceControls()
-{
-   if (!mpAffordanceCellControl)
-      mpAffordanceCellControl = DoGetAffordanceControls();
-   return mpAffordanceCellControl;
-}
-
 void TrackView::DoSetY(int y)
 {
    mY = y;
@@ -172,7 +165,7 @@ void TrackView::DoSetHeight(int h)
    mHeight = h;
 }
 
-std::shared_ptr<CommonTrackCell> TrackView::DoGetAffordanceControls()
+std::shared_ptr<CommonTrackCell> TrackView::GetAffordanceControls()
 {
    return {};
 }

src/tracks/ui/TrackView.h

@@ -85,9 +85,9 @@ public:
    std::shared_ptr<TrackVRulerControls> GetVRulerControls();
    std::shared_ptr<const TrackVRulerControls> GetVRulerControls() const;
 
-   // by default returns nullptr, meaning that track has no drag controls area
+   // Returns cell that would be used at affordance area, by default returns nullptr,
-   std::shared_ptr<CommonTrackCell> GetAffordanceControls();
+   // meaning that track has no such area.
-
+   virtual std::shared_ptr<CommonTrackCell> GetAffordanceControls();
 
    void WriteXMLAttributes( XMLWriter & ) const override;
    bool HandleXMLAttribute( const wxChar *attr, const wxChar *value ) override;
@@ -116,11 +116,8 @@ protected:
    // Private factory to make appropriate object; class TrackView handles
    // memory management thereafter
    virtual std::shared_ptr<TrackVRulerControls> DoGetVRulerControls() = 0;
-   // May return nullptr (which is default) if track does not need affordance area
-   virtual std::shared_ptr<CommonTrackCell> DoGetAffordanceControls();
 
    std::shared_ptr<TrackVRulerControls> mpVRulerControls;
-   std::shared_ptr<CommonTrackCell> mpAffordanceCellControl;
 
 private:
    bool           mMinimized{ false };