move widget code to commons

OpenRA.Mods.Common/Widgets/Logic/SimpleTooltipLogic.cs

@@ -0,0 +1,40 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2015 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 OpenRA.Widgets;
+
+namespace OpenRA.Mods.Common.Widgets.Logic
+{
+	public class SimpleTooltipLogic
+	{
+		[ObjectCreator.UseCtor]
+		public SimpleTooltipLogic(Widget widget, TooltipContainerWidget tooltipContainer, Func<string> getText)
+		{
+			var label = widget.Get<LabelWidget>("LABEL");
+
+			var font = Game.Renderer.Fonts[label.Font];
+			var cachedWidth = 0;
+			var labelText = "";
+			tooltipContainer.BeforeRender = () =>
+			{
+				labelText = getText();
+				var textWidth = font.Measure(labelText).X;
+				if (textWidth != cachedWidth)
+				{
+					label.Bounds.Width = textWidth;
+					widget.Bounds.Width = 2 * label.Bounds.X + textWidth;
+				}
+			};
+
+			label.GetText = () => labelText;
+		}
+	}
+}