Add CalcRowsCols

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@37691 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

wxPython/src/_sizers.i

@@ -1179,6 +1179,25 @@ define extra space between all children.", "");
         int , GetHGap(),
         "Returns the horizontal gap (in pixels) between cells in the sizer.", "");
 
+    %pythoncode {
+        def CalcRowsCols(self):
+            """
+            CalcRowsCols() -> (rows, cols)
+
+            Calculates how many rows and columns will be in the sizer based
+            on the current number of items and also the rows, cols specified
+            in the constructor.
+            """
+            nitems = len(self.GetChildren())
+            rows = self.GetRows()
+            cols = self.GetCols()
+            assert rows != 0 or cols != 0, "Grid sizer must have either rows or columns fixed"
+            if cols != 0:
+                rows = (nitems + cols - 1) / cols
+            elif rows != 0:
+                cols = (nitems + rows - 1) / rows
+            return (rows, cols)
+    }
 };
 
 //---------------------------------------------------------------------------