Split viewport scrolling into its own widget

OpenRA.Game/Widgets/ViewportScrollControllerWidget.cs

@@ -0,0 +1,105 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2010 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 LICENSE.
+ */
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Linq;
+using OpenRA.Orders;
+using OpenRA.Traits;
+using OpenRA.FileFormats;
+
+namespace OpenRA.Widgets
+{
+	[Flags]
+	public enum ScrollDirection
+	{
+		None = 0,
+		Up = 1,
+		Left = 2,
+		Down = 4,
+		Right = 8
+	}
+		
+	class ViewportScrollControllerWidget : Widget
+	{
+		public ViewportScrollControllerWidget() : base()	{}
+		protected ViewportScrollControllerWidget(ViewportScrollControllerWidget widget) : base(widget) {}
+		
+		public override void DrawInner( World world ) {}
+		
+
+		ScrollDirection Scroll;
+		public override bool HandleInputInner(MouseInput mi)
+		{						
+			if (mi.Event == MouseInputEvent.Move &&
+				(mi.Button == MouseButton.Middle || mi.Button == (MouseButton.Left | MouseButton.Right)))
+			{
+				Game.viewport.Scroll(Widget.LastMousePos - mi.Location);
+				return true;
+			}
+			return false;
+		}
+		
+		public override string GetCursor(int2 pos)
+		{
+			return null;
+		}
+
+		public override bool LoseFocus (MouseInput mi)
+		{
+			Scroll = ScrollDirection.None;
+			return base.LoseFocus(mi);
+		}
+		
+		public override bool HandleKeyPressInner(KeyInput e)
+		{
+			
+			switch (e.KeyName)
+			{
+				case "up": Scroll = Scroll.Set(ScrollDirection.Up, (e.Event == KeyInputEvent.Down)); return true;
+				case "down": Scroll = Scroll.Set(ScrollDirection.Down, (e.Event == KeyInputEvent.Down)); return true;
+				case "left": Scroll = Scroll.Set(ScrollDirection.Left, (e.Event == KeyInputEvent.Down)); return true;
+				case "right": Scroll = Scroll.Set(ScrollDirection.Right, (e.Event == KeyInputEvent.Down)); return true;
+			}
+			return false;
+		}
+		
+		public override void Tick(World world)
+		{
+			var scroll = new float2(0,0);
+			if (Scroll.Includes(ScrollDirection.Up))
+				scroll += new float2(0, -10);
+			if (Scroll.Includes(ScrollDirection.Right))
+				scroll += new float2(10, 0);
+			if (Scroll.Includes(ScrollDirection.Down))
+				scroll += new float2(0, 10);
+			if (Scroll.Includes(ScrollDirection.Left))
+				scroll += new float2(-10, 0);
+			
+			Game.viewport.Scroll(scroll);
+		}
+		
+		public override Widget Clone() { return new ViewportScrollControllerWidget(this); }
+	}
+	
+	public static class ViewportExts
+	{	
+		public static bool Includes(this ScrollDirection d, ScrollDirection s)
+		{
+			return (d & s) == s;
+		}
+		
+		public static ScrollDirection Set(this ScrollDirection d, ScrollDirection s, bool val)
+		{
+			return (d.Includes(s) != val) ? d ^ s : d;
+		}
+	}
+}