Add new trait ReloadArmamentsBar which renders a bar to show the current reload status

OpenRA.Mods.Common/OpenRA.Mods.Common.csproj

@@ -811,6 +811,7 @@
     <Compile Include="Widgets\Logic\ButtonTooltipWithDescHighlightLogic.cs" />
     <Compile Include="Traits\AutoTargetPriority.cs" />
     <Compile Include="Traits\Conditions\GrantConditionOnBotOwner.cs" />
+    <Compile Include="Traits\Render\ReloadArmamentsBar.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <Target Name="AfterBuild">

OpenRA.Mods.Common/Traits/Render/ReloadArmamentsBar.cs

@@ -0,0 +1,60 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2017 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, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Linq;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits.Render
+{
+	[Desc("Visualizes the minimum remaining time for reloading the armaments.")]
+	class ReloadArmamentsBarInfo : ITraitInfo
+	{
+		[Desc("Armament names")]
+		public readonly string[] Armaments = { "primary", "secondary" };
+
+		public readonly Color Color = Color.Red;
+
+		public object Create(ActorInitializer init) { return new ReloadArmamentsBar(init.Self, this); }
+	}
+
+	class ReloadArmamentsBar : ISelectionBar, INotifyCreated
+	{
+		readonly ReloadArmamentsBarInfo info;
+		readonly Actor self;
+		IEnumerable<Armament> armaments;
+
+		public ReloadArmamentsBar(Actor self, ReloadArmamentsBarInfo info)
+		{
+			this.self = self;
+			this.info = info;
+		}
+
+		void INotifyCreated.Created(Actor self)
+		{
+			// Name check can be cached but enabled check can't.
+			armaments = self.TraitsImplementing<Armament>().Where(a => info.Armaments.Contains(a.Info.Name)).ToArray().Where(Exts.IsTraitEnabled);
+		}
+
+		float ISelectionBar.GetValue()
+		{
+			if (!self.Owner.IsAlliedWith(self.World.RenderPlayer))
+				return 0;
+
+			return armaments.Min(a => a.FireDelay / (float)a.Weapon.ReloadDelay);
+		}
+
+		Color ISelectionBar.GetColor() { return info.Color; }
+		bool ISelectionBar.DisplayWhenEmpty { get { return false; } }
+	}
+}