add Caching property to Group, to allow disabling caching for very often updated surface

1 files changed, 10 insertions, 3 deletions

diff --git a/src/GraphicObjects/GraphicObject.cs b/src/GraphicObjects/GraphicObject.cs
index b9b142c0..140e5917 100644
--- a/src/GraphicObjects/GraphicObject.cs
+++ b/src/GraphicObjects/GraphicObject.cs
@@ -79,6 +79,7 @@ namespace Crow
 		HorizontalAlignment _horizontalAlignment = HorizontalAlignment.Center;
 		Size _maximumSize = "0;0";
 		Size _minimumSize = "0;0";
+		bool isRegisteredForRepaint = false;
 		#endregion
 
 		#region public fields
@@ -459,11 +460,16 @@ namespace Crow
 			//test if this speed up a lot to cancel clipping for an uncached group
 			Group p = Parent as Group;
 			if (p != null) {
-				if (p.bmp == null)
+				if (p.bmp == null || !p.Caching) {
+					p.RegisterForRedraw ();	
 					return;
+				}
 			}
-			if (HostContainer != null)
-				HostContainer.gobjsToRedraw.Add (this);
+			if (HostContainer == null || isRegisteredForRepaint)
+				return;
+
+			HostContainer.gobjsToRedraw.Add (this);
+			isRegisteredForRepaint = true;
 		}
 
 		/// <summary>
@@ -485,6 +491,7 @@ namespace Crow
 			//this clipping should take only last painted slots in ancestor tree which
 			//is not the case for now.
 			HostContainer.redrawClip.AddRectangle (ScreenCoordinates(LastPaintedSlot));
+			isRegisteredForRepaint = false;
 		}
 		/// <summary> return size of content + margins </summary>
 		protected virtual Size measureRawSize ()