From 4fe97acbc9a4472886c428adfae9613ef6ec490b Mon Sep 17 00:00:00 2001
From: Paul Licameli <paul.licameli@audacityteam.org>
Date: Mon, 17 Sep 2018 12:53:34 -0400
Subject: [PATCH] Define CellularPanel::Root

---
 src/AdornedRulerPanel.cpp | 5 +++++
 src/AdornedRulerPanel.h   | 5 +++++
 src/CellularPanel.h       | 6 ++++++
 src/TrackPanel.cpp        | 5 +++++
 src/TrackPanel.h          | 4 ++++
 5 files changed, 25 insertions(+)

diff --git a/src/AdornedRulerPanel.cpp b/src/AdornedRulerPanel.cpp
index b73343d57..7e8af675f 100644
--- a/src/AdornedRulerPanel.cpp
+++ b/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() &&
diff --git a/src/AdornedRulerPanel.h b/src/AdornedRulerPanel.h
index bbbc86ea2..999b892ae 100644
--- a/src/AdornedRulerPanel.h
+++ b/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:
diff --git a/src/CellularPanel.h b/src/CellularPanel.h
index 00eda5f5e..19b96e32f 100644
--- a/src/CellularPanel.h
+++ b/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;
diff --git a/src/TrackPanel.cpp b/src/TrackPanel.cpp
index fd02d99c2..44c60fda0 100644
--- a/src/TrackPanel.cpp
+++ b/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.
diff --git a/src/TrackPanel.h b/src/TrackPanel.h
index 12a73bba5..e1bc38b4b 100644
--- a/src/TrackPanel.h
+++ b/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;