Another override of CellularPanel::FindRect taking a predicate

src/CellularPanel.cpp

@@ -1043,6 +1043,21 @@ wxRect CellularPanel::FindRect( const TrackPanelCell &cell )
    return result;
 }
 
+wxRect CellularPanel::FindRect(
+   const std::function< bool( TrackPanelNode& ) > &pred)
+{
+   wxRect result;
+
+   struct Stop{};
+   try { VisitPreorder( [&]( const wxRect &rect, TrackPanelNode &visited ) {
+      if ( pred( visited ) )
+         result = rect, throw Stop{};
+   } ); }
+   catch ( const Stop& ) {}
+
+   return result;
+}
+
 UIHandlePtr CellularPanel::Target()
 {
    auto &state = *mState;

src/CellularPanel.h

@@ -97,6 +97,12 @@ public:
    // is not specified which rectangle is returned.
    wxRect FindRect(const TrackPanelCell &cell);
 
+   // Search the tree of subdivisions of the panel area for a node (group or
+   // cell) satisfying the predicate. If more than one sub-area is associated
+   // with some node satisfying the predicate, it is not specified which
+   // rectangle is returned.
+   wxRect FindRect(const std::function< bool( TrackPanelNode& ) > &pred);
+
    UIHandlePtr Target();
    
    std::shared_ptr<TrackPanelCell> LastCell() const;