[banshee/grid] [DataViewChild] Allow relative invalidations

[Aaron Bockover <abock src gnome org>]

commit a9fa90df71fb1b710d97b16c7b896d81c0d51a43
Author: Aaron Bockover <abockover novell com>
Date:   Sat Jan 23 14:54:56 2010 -0500

    [DataViewChild] Allow relative invalidations

 .../Banshee.Collection.Gui/ColumnCellAlbum.cs      |    7 ++++++-
 .../Hyena.Gui/Hyena.Data.Gui/DataViewChild.cs      |   10 ++++++++--
 2 files changed, 14 insertions(+), 3 deletions(-)
---
diff --git a/src/Core/Banshee.ThickClient/Banshee.Collection.Gui/ColumnCellAlbum.cs b/src/Core/Banshee.ThickClient/Banshee.Collection.Gui/ColumnCellAlbum.cs
index e1a9d45..b1c28c6 100644
--- a/src/Core/Banshee.ThickClient/Banshee.Collection.Gui/ColumnCellAlbum.cs
+++ b/src/Core/Banshee.ThickClient/Banshee.Collection.Gui/ColumnCellAlbum.cs
@@ -53,7 +53,12 @@ namespace Banshee.Collection.Gui
                     ? actor.StepDeltaPercent
                     : -actor.StepDeltaPercent;
                 actor.Target.prelight_opacity = alpha = Math.Max (0.0, Math.Min (1.0, alpha));
-                actor.Target.Invalidate ();
+                actor.Target.Invalidate (new Gdk.Rectangle () {
+                    X = (int)actor.Target.PaddingX,
+                    Y = (int)actor.Target.PaddingY,
+                    Width = (int)actor.Target.ImageSize,
+                    Height = (int)actor.Target.ImageSize
+                });
                 return alpha > 0 && alpha < 1;
             };
         }
diff --git a/src/Libraries/Hyena.Gui/Hyena.Data.Gui/DataViewChild.cs b/src/Libraries/Hyena.Gui/Hyena.Data.Gui/DataViewChild.cs
index 2925b43..a224723 100644
--- a/src/Libraries/Hyena.Gui/Hyena.Data.Gui/DataViewChild.cs
+++ b/src/Libraries/Hyena.Gui/Hyena.Data.Gui/DataViewChild.cs
@@ -38,7 +38,7 @@ namespace Hyena.Data.Gui
         public DataViewLayout ParentLayout { get; set; }
         public int ModelRowIndex { get; set; }
 
-        public override void Invalidate (Gdk.Rectangle area)
+        protected override void OnInvalidate (Gdk.Rectangle area)
         {
             ParentLayout.View.QueueDirtyRegion (area);
         }
@@ -130,10 +130,16 @@ namespace Hyena.Data.Gui
         public abstract void Render (CellContext context);
         public abstract Gdk.Size Measure ();
 
-        public virtual void Invalidate (Gdk.Rectangle area)
+        protected virtual void OnInvalidate (Gdk.Rectangle area)
         {
         }
 
+        public void Invalidate (Gdk.Rectangle area)
+        {
+            area.Offset (Allocation.X, Allocation.Y);
+            OnInvalidate (area);
+        }
+
         public void Invalidate ()
         {
             Invalidate (Allocation);