Start implementing new tooltip bits. Test tooltips added for buttons and production palette.

OpenRA.Mods.Cnc/Widgets/TooltipButtonWidget.cs

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+#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 OpenRA.FileFormats;
+using OpenRA.Widgets;
+
+namespace OpenRA.Mods.Cnc.Widgets
+{
+	public class TooltipButtonWidget : ButtonWidget
+	{
+		public readonly string TooltipTemplate;
+		public readonly string TooltipText;
+		public readonly string TooltipContainer;
+		Lazy<TooltipContainerWidget> tooltipContainer;
+
+		public TooltipButtonWidget()
+			: base()
+		{
+			tooltipContainer = new Lazy<TooltipContainerWidget>(() =>
+				Widget.RootWidget.GetWidget<TooltipContainerWidget>(TooltipContainer));
+		}
+
+		protected TooltipButtonWidget(TooltipButtonWidget other)
+			: base(other)
+		{
+			TooltipTemplate = other.TooltipTemplate;
+			TooltipText = other.TooltipText;
+			TooltipContainer = other.TooltipContainer;
+			tooltipContainer = new Lazy<TooltipContainerWidget>(() =>
+				Widget.RootWidget.GetWidget<TooltipContainerWidget>(TooltipContainer));
+		}
+
+		public override void MouseEntered()
+		{
+			if (TooltipContainer == null)
+				return;
+
+			var panel = Widget.LoadWidget(TooltipTemplate, null, new WidgetArgs() {{ "button", this }});
+			tooltipContainer.Value.SetTooltip(panel);
+		}
+
+		public override void MouseExited()
+		{
+			if (TooltipContainer == null) return;
+			tooltipContainer.Value.RemoveTooltip();
+		}
+	}
+}