Define CellularPanel::Root

src/AdornedRulerPanel.cpp

@@ -2102,6 +2102,11 @@ void AdornedRulerPanel::GetMaxSize(wxCoord *width, wxCoord *height)
 }
 
 // CellularPanel implementation
+std::shared_ptr<TrackPanelNode> AdornedRulerPanel::Root()
+{
+   return {};
+}
+
 auto AdornedRulerPanel::FindCell(int mouseX, int mouseY) -> FoundCell
 {
    bool mayScrub = mProject->GetScrubber().CanScrub() &&

src/AdornedRulerPanel.h

@@ -172,6 +172,11 @@ private:
    //
    // CellularPanel implementation
    //
+
+   // Get the root object defining a recursive subdivision of the panel's
+   // area into cells
+   std::shared_ptr<TrackPanelNode> Root() override;
+
    FoundCell FindCell(int mouseX, int mouseY) override;
    wxRect FindRect(const TrackPanelCell &cell) override;
 public:

src/CellularPanel.h

@@ -18,6 +18,7 @@ class ViewInfo;
 class AudacityProject;
 
 class TrackPanelCell;
+class TrackPanelNode;
 struct TrackPanelMouseEvent;
 struct TrackPanelMouseState;
 
@@ -47,6 +48,11 @@ public:
       std::shared_ptr<TrackPanelCell> pCell;
       wxRect rect;
    };
+
+   // Get the root object defining a recursive subdivision of the panel's
+   // area into cells
+   virtual std::shared_ptr<TrackPanelNode> Root() = 0;
+
    virtual FoundCell FindCell(int mouseX, int mouseY) = 0;
    virtual wxRect FindRect(const TrackPanelCell &cell) = 0;
    virtual TrackPanelCell *GetFocusedCell() = 0;

src/TrackPanel.cpp

@@ -1956,6 +1956,11 @@ void TrackPanel::DrawShadow(const Track * /* t */ , wxDC * dc, const wxRect & re
    AColor::Line(*dc, right, rect.y, right, rect.y + 1);
 }
 
+std::shared_ptr<TrackPanelNode> TrackPanel::Root()
+{
+   return {};
+}
+
 /// Determines which cell is under the mouse
 ///  @param mouseX - mouse X position.
 ///  @param mouseY - mouse Y position.

src/TrackPanel.h

@@ -337,6 +337,10 @@ protected:
    void MakeParentModifyState(bool bWantsAutoSave);    // if true, writes auto-save file. Should set only if you really want the state change restored after
                                                                // a crash, as it can take many seconds for large (eg. 10 track-hours) projects
 
+   // Get the root object defining a recursive subdivision of the panel's
+   // area into cells
+   std::shared_ptr<TrackPanelNode> Root() override;
+
    // Find track info by coordinate
    FoundCell FindCell(int mouseX, int mouseY) override;