Fixes #1018. Since childNeedsDisplay is used outside the View class it must to be a property.

Terminal.Gui/Core/Application.cs

@@ -588,11 +588,11 @@ namespace Terminal.Gui {
 				} else if (!wait) {
 					return;
 				}
-				if (state.Toplevel != Top && (!Top.NeedDisplay.IsEmpty || Top.childNeedsDisplay)) {
+				if (state.Toplevel != Top && (!Top.NeedDisplay.IsEmpty || Top.ChildNeedsDisplay)) {
 					Top.Redraw (Top.Bounds);
 					state.Toplevel.SetNeedsDisplay (state.Toplevel.Bounds);
 				}
-				if (!state.Toplevel.NeedDisplay.IsEmpty || state.Toplevel.childNeedsDisplay) {
+				if (!state.Toplevel.NeedDisplay.IsEmpty || state.Toplevel.ChildNeedsDisplay) {
 					state.Toplevel.Redraw (state.Toplevel.Bounds);
 					if (DebugDrawBounds) {
 						DrawBounds (state.Toplevel);

Terminal.Gui/Core/View.cs

@@ -721,7 +721,7 @@ namespace Terminal.Gui {
 				NeedDisplay = new Rect (x, y, w, h);
 			}
 			if (container != null)
-				container.ChildNeedsDisplay ();
+				container.SetChildNeedsDisplay ();
 			if (subviews == null)
 				return;
 			foreach (var view in subviews)
@@ -733,16 +733,16 @@ namespace Terminal.Gui {
 				}
 		}
 
-		internal bool childNeedsDisplay;
+		internal bool ChildNeedsDisplay { get; private set; }
 
 		/// <summary>
 		/// Indicates that any child views (in the <see cref="Subviews"/> list) need to be repainted.
 		/// </summary>
-		public void ChildNeedsDisplay ()
+		public void SetChildNeedsDisplay ()
 		{
-			childNeedsDisplay = true;
+			ChildNeedsDisplay = true;
 			if (container != null)
-				container.ChildNeedsDisplay ();
+				container.SetChildNeedsDisplay ();
 		}
 
 		internal bool addingView = false;
@@ -1288,7 +1288,7 @@ namespace Terminal.Gui {
 		protected void ClearNeedsDisplay ()
 		{
 			NeedDisplay = Rect.Empty;
-			childNeedsDisplay = false;
+			ChildNeedsDisplay = false;
 		}
 
 		/// <summary>
@@ -1333,7 +1333,7 @@ namespace Terminal.Gui {
 
 			if (subviews != null) {
 				foreach (var view in subviews) {
-					if (!view.NeedDisplay.IsEmpty || view.childNeedsDisplay) {
+					if (!view.NeedDisplay.IsEmpty || view.ChildNeedsDisplay) {
 						if (view.Frame.IntersectsWith (clipRect) && (view.Frame.IntersectsWith (bounds) || bounds.X < 0 || bounds.Y < 0)) {
 							if (view.LayoutNeeded)
 								view.LayoutSubviews ();
@@ -1346,7 +1346,7 @@ namespace Terminal.Gui {
 							}
 						}
 						view.NeedDisplay = Rect.Empty;
-						view.childNeedsDisplay = false;
+						view.ChildNeedsDisplay = false;
 					}
 				}
 			}

UICatalog/UICatalog.cs

@@ -253,7 +253,7 @@ namespace UICatalog {
 					_leftPane.Height = Dim.Fill(_statusBar.Visible ? 1 : 0);
 					_rightPane.Height = Dim.Fill(_statusBar.Visible ? 1 : 0);
 					_top.LayoutSubviews();
-					_top.ChildNeedsDisplay();
+					_top.SetChildNeedsDisplay();
 				}),
 			};