[hyena] Grow surface cache as needed (bgo#612593)

[Gabriel Burt <gburt src gnome org>]

commit b26d5f6ce96c42cb14439dcd069976fd9cc40208
Author: Alexander Kojevnikov <alexander kojevnikov com>
Date:   Sat Mar 13 16:38:00 2010 +1100

    Grow surface cache as needed (bgo#612593)

 src/Hyena.Gui/Hyena.Data.Gui/DataViewLayoutGrid.cs |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/src/Hyena.Gui/Hyena.Data.Gui/DataViewLayoutGrid.cs b/src/Hyena.Gui/Hyena.Data.Gui/DataViewLayoutGrid.cs
index d4d418e..2828043 100644
--- a/src/Hyena.Gui/Hyena.Data.Gui/DataViewLayoutGrid.cs
+++ b/src/Hyena.Gui/Hyena.Data.Gui/DataViewLayoutGrid.cs
@@ -39,6 +39,7 @@ namespace Hyena.Data.Gui
         public int Columns { get; private set; }
 
         public Func<DataViewChild> ChildAllocator { get; set; }
+        public event EventHandler<EventArgs<int>> ChildCountChanged;
 
         protected override void InvalidateChildSize ()
         {
@@ -68,6 +69,11 @@ namespace Hyena.Data.Gui
                 : 0;
 
             ResizeChildCollection (Rows * Columns);
+
+            var handler = ChildCountChanged;
+            if (handler != null) {
+                handler (this, new EventArgs<int> (Rows * Columns));
+            }
         }
 
         protected override void InvalidateChildLayout ()