Issue #4650: Abort Mission Confirmation

Adapted the confirmation dialog from the CnC mod and wired it to
the "Abort" and "Surrender" buttons.

OpenRA.Mods.RA/Widgets/ConfirmationDialogs.cs

@@ -0,0 +1,42 @@
+#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 System;
+using OpenRA.Widgets;
+
+namespace OpenRA.Mods.RA.Widgets
+{
+	public static class ConfirmationDialogs
+	{
+		public static void PromptConfirmAction(string title, string text, Action onConfirm, Action onCancel = null, string confirmText = null, string cancelText = null)
+		{
+			var prompt = Ui.OpenWindow("CONFIRM_PROMPT");
+			prompt.Get<LabelWidget>("PROMPT_TITLE").GetText = () => title;
+			prompt.Get<LabelWidget>("PROMPT_TEXT").GetText = () => text;
+			if (!string.IsNullOrEmpty(confirmText))
+				prompt.Get<ButtonWidget>("CONFIRM_BUTTON").GetText = () => confirmText;
+			if (!string.IsNullOrEmpty(cancelText))
+				prompt.Get<ButtonWidget>("CANCEL_BUTTON").GetText = () => cancelText;
+
+			prompt.Get<ButtonWidget>("CONFIRM_BUTTON").OnClick = () =>
+			{
+				Ui.CloseWindow();
+				onConfirm();
+			};
+
+			prompt.Get<ButtonWidget>("CANCEL_BUTTON").OnClick = () =>
+			{
+				Ui.CloseWindow();
+				if (onCancel != null)
+					onCancel();
+			};
+		}
+	}
+}