Move ScrollItem upstream

OpenRA.Game/Widgets/ScrollItem.cs

@@ -0,0 +1,54 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2011 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made 
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System;
+using System.Drawing;
+using OpenRA.Graphics;
+
+namespace OpenRA.Widgets
+{
+	public class ScrollItemWidget : ButtonWidget
+	{
+		public ScrollItemWidget()
+			: base()
+		{
+			IsVisible = () => false;
+		}
+		
+		protected ScrollItemWidget(ScrollItemWidget other)
+			: base(other)
+		{
+			IsVisible = () => false;
+		}
+		
+		public Func<bool> IsSelected = () => false;
+
+		public override void DrawInner()
+		{
+			var state = IsSelected() ? "scrollitem-selected" : 
+				RenderBounds.Contains(Viewport.LastMousePos) ? "scrollitem-hover" : 
+				null;
+			
+			if (state != null)
+				WidgetUtils.DrawPanel(state, RenderBounds);
+		}
+		
+		public override Widget Clone() { return new ScrollItemWidget(this); }
+				
+		public static ScrollItemWidget Setup(ScrollItemWidget template, Func<bool> isSelected, Action onClick)
+		{
+			var w = template.Clone() as ScrollItemWidget;
+			w.IsVisible = () => true;
+			w.IsSelected = isSelected;
+			w.OnClick = onClick;
+			return w;
+		}
+	}
+}