- Main change is the addition of wxGridSelectRowsOrColumns selection mode

(which is still probably buggy, wxGridSelection needs to be reviewed)
- Add XYToCell() overloads returning wxGridCellCoords (instead of modifying the
  argument passed by reference -- where did this come from?) and document them.
- Added GoToCell() which does make the new current cell visible unlike
  SetGridCursor() (which was documented as doing it, but wasn't)
- Changed SetCurrentCell() to only not change the cell if wxEVT_GRID_SELECT_CELL
  it generates is vetoed, not just processed as this seems to make more sense
- Split jumbo (~400 lines) ProcessGridCellMouseEvent() function into chunks
- Add many more comments to make reading this code seem less like puzzle
  solving for the next unfortunate soul to do it


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@55746 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/gridsel.cpp

@@ -385,15 +385,30 @@ void wxGridSelection::SelectBlock( int topRow, int leftCol,
                                    bool sendEvent )
 {
     // Fix the coordinates of the block if needed.
-    if ( m_selectionMode == wxGrid::wxGridSelectRows )
+    switch ( m_selectionMode )
     {
-        leftCol = 0;
-        rightCol = m_grid->GetNumberCols() - 1;
-    }
-    else if ( m_selectionMode == wxGrid::wxGridSelectColumns )
-    {
-        topRow = 0;
-        bottomRow = m_grid->GetNumberRows() - 1;
+        default:
+            wxFAIL_MSG( "unknown selection mode" );
+            // fall through
+
+        case wxGrid::wxGridSelectCells:
+            // nothing to do -- in this mode arbitrary blocks can be selected
+            break;
+
+        case wxGrid::wxGridSelectRows:
+            leftCol = 0;
+            rightCol = m_grid->GetNumberCols() - 1;
+            break;
+
+        case wxGrid::wxGridSelectColumns:
+            topRow = 0;
+            bottomRow = m_grid->GetNumberRows() - 1;
+            break;
+
+        case wxGrid::wxGridSelectRowsOrColumns:
+            // block selection doesn't make sense for this mode, we could only
+            // select the entire grid but this wouldn't be useful
+            return;
     }
 
     if ( topRow > bottomRow )