Added a MouseAttachmentWidget to render the Direction arrows in SelectDirectionalTarget

OpenRA.Mods.Common/Widgets/MouseAttachmentWidget.cs

@@ -0,0 +1,57 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2019 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 OpenRA.Graphics;
+using OpenRA.Widgets;
+
+namespace OpenRA.Mods.Common.Widgets
+{
+	public class MouseAttachmentWidget : Widget
+	{
+		public bool ClickThrough = true;
+
+		Sprite sprite;
+		readonly WorldRenderer worldRenderer;
+		string palette;
+		int2 location;
+
+		[ObjectCreator.UseCtor]
+		public MouseAttachmentWidget(WorldRenderer worldRenderer)
+		{
+			this.worldRenderer = worldRenderer;
+		}
+
+		public override void Draw()
+		{
+			if (sprite != null && palette != null)
+			{
+				var scale = Game.Cursor is SoftwareCursor && CursorProvider.CursorViewportZoomed ? 2 : 1;
+				var directionPalette = worldRenderer.Palette(palette);
+				WidgetUtils.DrawSHPCentered(sprite, ChildOrigin, directionPalette, scale);
+			}
+		}
+
+		public void SetAttachment(int2 location, Sprite sprite, string palette)
+		{
+			this.sprite = sprite;
+			this.location = location;
+			this.palette = palette;
+		}
+
+		public void Reset()
+		{
+			sprite = null;
+			palette = null;
+		}
+
+		public override int2 ChildOrigin { get { return location; } }
+	}
+}