Remove the hardcoded mess of RadarBinWidget.

OpenRA.Mods.RA/Widgets/SlidingContainerWidget.cs

@@ -0,0 +1,66 @@
+#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 System.Linq;
+using OpenRA.Graphics;
+using OpenRA.Traits;
+using OpenRA.Widgets;
+
+namespace OpenRA.Mods.RA.Widgets
+{
+	public class SlidingContainerWidget : Widget
+	{
+		public int2 OpenOffset = int2.Zero;
+		public int2 ClosedOffset = int2.Zero;
+		public int AnimationLength = 0;
+		public Func<bool> IsOpen = () => false;
+		public Action AfterOpen = () => {};
+		public Action AfterClose = () => {};
+
+		int2 offset;
+		int frame;
+
+		public SlidingContainerWidget() : base() { }
+		public override void Initialize(WidgetArgs args)
+		{
+			base.Initialize(args);
+
+			// Start in the closed position
+			offset = ClosedOffset;
+		}
+
+		public override void Tick()
+		{
+			var open = IsOpen();
+
+			var targetFrame = open ? AnimationLength : 0;
+			if (frame == targetFrame)
+				return;
+
+			// Update child origin
+			frame += open ? 1 : -1;
+			offset = int2.Lerp(ClosedOffset, OpenOffset, frame, AnimationLength);
+
+			// Animation is complete
+			if (frame == targetFrame)
+			{
+				if (open)
+					AfterOpen();
+				else
+					AfterClose();
+			}
+		}
+
+		public override Rectangle EventBounds { get { return Rectangle.Empty; } }
+		public override int2 ChildOrigin { get { return RenderOrigin + offset; } }
+	}
+}