Determine the checkbox size in wxGetGridCheckBoxRect() itself

It doesn't make much sense to pass the size to the function supposed to
compute it, so call wxRendererNative::GetCheckBoxSize() from the
function itself instead of forcing its callers to do it.

No real changes.

include/wx/generic/private/grid.h

@@ -1007,12 +1007,16 @@ private:
     wxGridDataTypeInfoArray m_typeinfo;
 };
 
-// Returns the rect of the check box in a cell with the given alignmens
-// and the size.
-// The function is used by wxGridCellBoolEditor and wxGridCellBoolRenderer.
-wxRect wxGetGridCheckBoxRect(const wxSize& checkBoxSize,
-                             const wxRect& cellRect,
-                             int hAlign, int vAlign);
+// Returns the rectangle for showing a check box in a cell with the given
+// alignment.
+//
+// The function is used by wxGridCellBoolEditor and wxGridCellBoolRenderer to
+// draw a check mark and position wxCheckBox respectively.
+wxRect
+wxGetGridCheckBoxRect(wxWindow* win,
+                      const wxRect& cellRect,
+                      int hAlign,
+                      int vAlign);
 
 #endif // wxUSE_GRID
 #endif // _WX_GENERIC_GRID_PRIVATE_H_

src/generic/grid.cpp

@@ -10332,13 +10332,17 @@ wxGridCellEditor* wxGridTypeRegistry::GetEditor(int index)
     return editor;
 }
 
-wxRect wxGetGridCheckBoxRect(const wxSize& checkBoxSize,
+wxRect wxGetGridCheckBoxRect(wxWindow* win,
                              const wxRect& cellRect,
-                             int hAlign, int WXUNUSED(vAlign))
+                             int hAlign,
+                             int WXUNUSED(vAlign))
 {
-    // TODO: support vAlign
+    const wxSize checkBoxSize =
+        wxRendererNative::Get().GetCheckBoxSize(win, wxCONTROL_CELL);
 
     wxRect checkBoxRect;
+
+    // TODO: support vAlign
     checkBoxRect.SetY(cellRect.y + cellRect.height / 2 - checkBoxSize.y / 2);
 
     wxCoord minSize = wxMin(cellRect.width, cellRect.height);

src/generic/gridctrl.cpp

@@ -937,8 +937,11 @@ wxSize wxGridCellBoolRenderer::GetBestSize(wxGrid& grid,
     // compute it only once (no locks for MT safeness in GUI thread...)
     if ( !ms_sizeCheckMark.x )
     {
+        // Use rectangle big enough for the check box to fit into it.
+        const wxRect r(0, 0, 1000, 1000);
+
         ms_sizeCheckMark =
-            wxRendererNative::Get().GetCheckBoxSize(&grid, wxCONTROL_CELL);
+            wxGetGridCheckBoxRect(&grid, r, wxALIGN_LEFT, wxALIGN_TOP).GetSize();
     }
 
     return ms_sizeCheckMark;
@@ -958,12 +961,7 @@ void wxGridCellBoolRenderer::Draw(wxGrid& grid,
     attr.GetNonDefaultAlignment(&hAlign, &vAlign);
 
     const wxRect
-        checkBoxRect = wxGetGridCheckBoxRect
-                       (
-                            GetBestSize(grid, attr, dc, row, col),
-                            rect,
-                            hAlign, vAlign
-                        );
+        checkBoxRect = wxGetGridCheckBoxRect(&grid, rect, hAlign, vAlign);
 
     bool value;
     if ( grid.GetTable()->CanGetValueAs(row, col, wxGRID_VALUE_BOOL) )

src/generic/grideditors.cpp

@@ -1224,13 +1224,7 @@ void wxGridCellBoolEditor::SetSize(const wxRect& r)
         GetCellAttr()->GetNonDefaultAlignment(&hAlign, &vAlign);
 
     const wxRect
-        checkBoxRect = wxGetGridCheckBoxRect
-                       (
-                            wxRendererNative::Get().
-                                GetCheckBoxSize(GetWindow(), wxCONTROL_CELL),
-                            r,
-                            hAlign, vAlign
-                       );
+        checkBoxRect = wxGetGridCheckBoxRect(GetWindow(), r, hAlign, vAlign);
 
     // resize the control if required
     if ( m_control->GetSize() != checkBoxRect.GetSize() )