From b095e67ac320d0a14be25a20b55e3ef75e4e84dd Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Sat, 11 Apr 2020 23:53:42 +0200
Subject: [PATCH] Show more detailed information about selection in the grid
 sample

Show the selected cells/rows/columns/blocks instead of just showing
their number, as we now have an efficient (i.e. taking time proportional
to the number of selected blocks and not to the number of the individual
cells, rows or columns) way of doing this.

See #2576.
---
 samples/grid/griddemo.cpp | 78 ++++++++++++++++++++++++++++-----------
 1 file changed, 57 insertions(+), 21 deletions(-)

diff --git a/samples/grid/griddemo.cpp b/samples/grid/griddemo.cpp
index dd0536bbdb..c115f5c2f1 100644
--- a/samples/grid/griddemo.cpp
+++ b/samples/grid/griddemo.cpp
@@ -1220,32 +1220,68 @@ void GridFrame::SetCornerLabelValue( wxCommandEvent& WXUNUSED(ev) )
 
 void GridFrame::ShowSelection( wxCommandEvent& WXUNUSED(ev) )
 {
-    switch ( grid->GetSelectionMode() )
+    int count = 0;
+    wxString desc;
+    const wxGridSelectionRange& sel = grid->GetSelectionRange();
+    for ( wxGridSelectionRange::iterator it = sel.begin();
+          it != sel.end();
+          ++it, ++count )
     {
-        case wxGrid::wxGridSelectCells:
-            wxLogMessage("%zu individual cells and "
-                         "%zu blocks of contiguous cells selected",
-                         grid->GetSelectedCells().size(),
-                         grid->GetSelectionBlockTopLeft().size());
-            return;
+        const wxGridBlockCoords& b = *it;
 
-        case wxGrid::wxGridSelectRows:
-        case wxGrid::wxGridSelectColumns:
-        case wxGrid::wxGridSelectRowsOrColumns:
-            const wxArrayInt& rows = grid->GetSelectedRows();
-            if ( !rows.empty() )
-                wxLogMessage("%zu rows selected", rows.size());
+        wxString blockDesc;
+        if ( b.GetLeftCol() == 0 &&
+                b.GetRightCol() == grid->GetNumberCols() - 1 )
+        {
+            if ( b.GetTopRow() == b.GetBottomRow() )
+                blockDesc.Printf("row %d", b.GetTopRow() + 1);
+            else
+                blockDesc.Printf("rows %d..%d",
+                                 b.GetTopRow() + 1, b.GetBottomRow() + 1);
+        }
+        else if ( b.GetTopRow() == 0 &&
+                        b.GetBottomRow() == grid->GetNumberRows() - 1 )
+        {
+            if ( b.GetLeftCol() == b.GetRightCol() )
+                blockDesc.Printf("column %d", b.GetLeftCol() + 1);
+            else
+                blockDesc.Printf("columns %d..%d",
+                                 b.GetLeftCol() + 1,
+                                 b.GetRightCol() + 1);
+        }
+        else if ( b.GetTopRow() == b.GetBottomRow() &&
+                    b.GetLeftCol() == b.GetRightCol() )
+        {
+            blockDesc.Printf("cell R%dC%d",
+                             b.GetTopRow() + 1, b.GetLeftCol() + 1);
+        }
+        else
+        {
+            blockDesc.Printf("block R%dC%d - R%dC%d",
+                             b.GetTopRow() + 1,
+                             b.GetLeftCol() + 1,
+                             b.GetBottomRow() + 1,
+                             b.GetRightCol() + 1);
+        }
 
-            const wxArrayInt& cols = grid->GetSelectedCols();
-            if ( !cols.empty() )
-                wxLogMessage("%zu columns selected", rows.size());
-
-            if ( rows.empty() && cols.empty() )
-                wxLogMessage("No selection");
-            return;
+        if ( count )
+            desc += "\n\t";
+        desc += blockDesc;
     }
 
-    wxLogError("Unknown grid selection mode.");
+    switch ( count )
+    {
+        case 0:
+            wxLogMessage("No selection");
+            break;
+
+        case 1:
+            wxLogMessage("Selection: %s", desc);
+            break;
+
+        default:
+            wxLogMessage("%d selected blocks:\n\t%s", count, desc);
+    }
 }
 
 void GridFrame::SelectCells( wxCommandEvent& WXUNUSED(ev) )