Simple world tooltip.

OpenRA.Mods.Cnc/Widgets/TooltipWorldInteractionControllerWidget.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.Graphics;
+using OpenRA.Traits;
+using OpenRA.Widgets;
+using System.Linq;
+
+namespace OpenRA.Mods.Cnc.Widgets
+{
+	public class TooltipWorldInteractionControllerWidget : WorldInteractionControllerWidget
+	{
+		public readonly string TooltipTemplate = "WORLD_TOOLTIP";
+		public readonly string TooltipContainer;
+		Lazy<TooltipContainerWidget> tooltipContainer;
+
+		public enum WorldTooltipType { None, Unexplored, Actor }
+		public WorldTooltipType TooltipType { get; private set; }
+		public IToolTip ActorTooltip { get; private set; }
+
+		[ObjectCreator.UseCtor]
+		public TooltipWorldInteractionControllerWidget([ObjectCreator.Param] World world,
+		                                               [ObjectCreator.Param] WorldRenderer worldRenderer)
+			: base(world, worldRenderer)
+		{
+			tooltipContainer = new Lazy<TooltipContainerWidget>(() =>
+				Widget.RootWidget.GetWidget<TooltipContainerWidget>(TooltipContainer));
+		}
+
+		public override void MouseEntered()
+		{
+			if (TooltipContainer == null)
+				return;
+
+			tooltipContainer.Value.SetTooltip(
+				Widget.LoadWidget(TooltipTemplate, null, new WidgetArgs() {{ "world", world }, { "wic", this }}));
+		}
+
+		public override void MouseExited()
+		{
+			if (TooltipContainer == null) return;
+			tooltipContainer.Value.RemoveTooltip();
+		}
+
+		public void UpdateMouseover()
+		{
+			TooltipType = WorldTooltipType.None;
+			var cell = Game.viewport.ViewToWorld(Viewport.LastMousePos).ToInt2();
+			if (!world.Map.IsInMap(cell))
+				return;
+
+			if (world.LocalPlayer != null && !world.LocalPlayer.Shroud.IsExplored(cell))
+			{
+				TooltipType = WorldTooltipType.Unexplored;
+				return;
+			}
+
+			var actor = world.FindUnitsAtMouse(Viewport.LastMousePos).FirstOrDefault();
+			if (actor == null)
+				return;
+
+			ActorTooltip = actor.TraitsImplementing<IToolTip>().FirstOrDefault();
+			if (ActorTooltip != null)
+				TooltipType = WorldTooltipType.Actor;
+		}
+
+		public override bool HandleMouseInput(MouseInput mi)
+		{
+			if (mi.Event == MouseInputEvent.Move)
+				UpdateMouseover();
+
+			return base.HandleMouseInput(mi);
+		}
+
+		float2 cachedLocation;
+		public override void Tick()
+		{
+			if (Game.viewport.Location != cachedLocation)
+			{
+				UpdateMouseover();
+				cachedLocation = Game.viewport.Location;
+			}
+			base.Tick();
+		}
+	}
+}