add a pause/slowdown/play/fastforward button for replays

closes #4633

OpenRA.Mods.RA/Widgets/Logic/ReplayControlBarLogic.cs

@@ -0,0 +1,51 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2014 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.Linq;
+using OpenRA.Widgets;
+
+namespace OpenRA.Mods.RA.Widgets.Logic
+{
+	public class ReplayControlBarLogic
+	{
+
+		[ObjectCreator.UseCtor]
+		public ReplayControlBarLogic(Widget widget, World world)
+		{
+			if (world.IsReplay)
+			{
+				var container = widget.Get<ContainerWidget>("REPLAY_PLAYER");
+
+				var background = widget.Parent.GetOrNull<BackgroundWidget>("OBSERVER_CONTROL_BG");
+				if (background != null)
+					background.Bounds.Height += container.Bounds.Height;
+
+				container.Visible = true;
+
+				var pauseButton = widget.Get<ButtonWidget>("BUTTON_PAUSE");
+				pauseButton.IsHighlighted = () => world.Timestep == 0;
+				pauseButton.OnClick = () => world.Timestep = 0;
+
+				var slowButton = widget.Get<ButtonWidget>("BUTTON_SLOW");
+				slowButton.IsHighlighted = () => world.Timestep > Game.Timestep;
+				slowButton.OnClick = () => world.Timestep = Game.Timestep * 2;
+
+				var normalSpeedButton = widget.Get<ButtonWidget>("BUTTON_NORMALSPEED");
+				normalSpeedButton.IsHighlighted = () => world.Timestep == Game.Timestep;
+				normalSpeedButton.OnClick = () => world.Timestep = Game.Timestep;
+
+				var fastforwardButton = widget.Get<ButtonWidget>("BUTTON_FASTFORWARD");
+				fastforwardButton.IsHighlighted = () => world.Timestep == 1;
+				fastforwardButton.OnClick = () => world.Timestep = 1;
+			}
+		}
+	}
+}