Add LobbyPrerequisiteCheckbox trait.

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

@@ -834,6 +834,7 @@
     <Compile Include="Widgets\Logic\Ingame\Hotkeys\CycleStatusBarsHotkeyLogic.cs" />
     <Compile Include="Lint\CheckConflictingMouseBounds.cs" />
     <Compile Include="Widgets\Logic\Lobby\LobbyOptionsLogic.cs" />
+    <Compile Include="Traits\World\LobbyPrerequisiteCheckbox.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <Target Name="AfterBuild">

OpenRA.Mods.Common/Traits/World/LobbyPrerequisiteCheckbox.cs

@@ -0,0 +1,76 @@
+#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.Collections.Generic;
+using System.Linq;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("Enables defined prerequisites at game start for all players if the checkbox is enabled.")]
+	public class LobbyPrerequisiteCheckboxInfo : ITraitInfo, ILobbyOptions
+	{
+		[FieldLoader.Require]
+		[Desc("Internal id for this checkbox.")]
+		public readonly string ID = null;
+
+		[FieldLoader.Require]
+		[Desc("Display name for this checkbox.")]
+		public readonly string Label = null;
+
+		[Desc("Description name for this checkbox.")]
+		public readonly string Description = null;
+
+		[Desc("Default value of the checkbox in the lobby.")]
+		public readonly bool Enabled = false;
+
+		[Desc("Prevent the checkbox from being changed from its default value.")]
+		public readonly bool Locked = false;
+
+		[Desc("Display the checkbox in the lobby.")]
+		public readonly bool Visible = true;
+
+		[Desc("Display order for the checkbox in the lobby.")]
+		public readonly int DisplayOrder = 0;
+
+		[FieldLoader.Require]
+		[Desc("Prerequisites to grant when this checkbox is enabled.")]
+		public readonly HashSet<string> Prerequisites = new HashSet<string>();
+
+		IEnumerable<LobbyOption> ILobbyOptions.LobbyOptions(Ruleset rules)
+		{
+			yield return new LobbyBooleanOption(ID, Label, Description,
+				Visible, DisplayOrder, Enabled, Locked);
+		}
+
+		public object Create(ActorInitializer init) { return new LobbyPrerequisiteCheckbox(this); }
+	}
+
+	public class LobbyPrerequisiteCheckbox : INotifyCreated, ITechTreePrerequisite
+	{
+		readonly LobbyPrerequisiteCheckboxInfo info;
+		HashSet<string> prerequisites = new HashSet<string>();
+
+		public LobbyPrerequisiteCheckbox(LobbyPrerequisiteCheckboxInfo info)
+		{
+			this.info = info;
+		}
+
+		void INotifyCreated.Created(Actor self)
+		{
+			var enabled = self.World.LobbyInfo.GlobalSettings.OptionOrDefault(info.ID, info.Enabled);
+			if (enabled)
+				prerequisites = info.Prerequisites;
+		}
+
+		IEnumerable<string> ITechTreePrerequisite.ProvidesPrerequisites { get { return prerequisites; } }
+	}
+}