diff --git a/.gitignore b/.gitignore
index 250beacab8..168a3f1d19 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,6 +5,7 @@ obj
 *.ncb
 *.vcproj*
 *.suo
+*.user
 
 # Red Alert binary files
 *.[mM][iI][xX]
diff --git a/OpenRa.DataStructures/int2.cs b/OpenRa.DataStructures/int2.cs
index 5aab4b0a71..5891005684 100644
--- a/OpenRa.DataStructures/int2.cs
+++ b/OpenRa.DataStructures/int2.cs
@@ -36,5 +36,6 @@ namespace OpenRa
 
 		public static readonly int2 Zero = new int2(0, 0);
 		public Point ToPoint() { return new Point(X, Y); }
+        public PointF ToPointF() { return new PointF(X, Y); }
 	}
 }
diff --git a/OpenRa.Game/Controller.cs b/OpenRa.Game/Controller.cs
index 7a3a8b31f4..07f1f26a3d 100644
--- a/OpenRa.Game/Controller.cs
+++ b/OpenRa.Game/Controller.cs
@@ -17,12 +17,16 @@ namespace OpenRa.Game
 			this.game = game;
 		}
 
-		public void WorldClicked(object sender, MouseEventArgs e)
+		public void HandleMouseInput(MouseInput mi)
 		{
-			var xy = (1 / 24.0f) * (new float2(e.Location) + game.viewport.Location);
-			if (orderGenerator != null)
-				orderGenerator.Order(game, new int2((int)xy.X, (int)xy.Y)).Apply(game);
-			// todo: route all orders through netcode
+            if (mi.Button == MouseButtons.Left && mi.Event == MouseInputEvent.Down)
+            {
+                var xy = (1 / 24.0f) * (new float2(mi.Location.X, mi.Location.Y) + game.viewport.Location);
+
+                if (orderGenerator != null)
+                    orderGenerator.Order(game, new int2((int)xy.X, (int)xy.Y)).Apply(game);
+                // todo: route all orders through netcode
+            }
 		}
 	}
 }
diff --git a/OpenRa.Game/Graphics/Region.cs b/OpenRa.Game/Graphics/Region.cs
index 6a35060fc0..093ab919fc 100644
--- a/OpenRa.Game/Graphics/Region.cs
+++ b/OpenRa.Game/Graphics/Region.cs
@@ -6,18 +6,18 @@ namespace OpenRa.Game.Graphics
 {
 	class Region
 	{
-		float2 location;
+		int2 location;
 		Viewport viewport;
 
-		public float2 Location
+        public int2 Location
 		{
-			get { return location + viewport.Location; }	// WTF HACK HACK HACK
+			get { return location + new int2( (int)viewport.Location.X, (int)viewport.Location.Y ); }	// WTF HACK HACK HACK
 		}
 
 		public readonly float2 Size;
 
 		Action drawFunction;
-		MouseEventHandler mouseHandler;
+        Action<MouseInput> mouseHandler;
 		Rectangle rect;
 
 		static int2 MakeSize(Viewport v, DockStyle d, int size)
@@ -37,12 +37,19 @@ namespace OpenRa.Game.Graphics
 			}
 		}
 
-		public void Clicked(MouseEventArgs e)
-		{
-			mouseHandler(this, new MouseEventArgs(e.Button, e.Clicks, e.X - rect.Left, e.Y - rect.Top, e.Delta));
-		}
+        public bool HandleMouseInput(MouseInput mi)
+        {
+            /* todo: route to the mousehandler once that's sorted */
+            if (mouseHandler != null) mouseHandler(new MouseInput
+            {
+                Button = mi.Button,
+                Event = mi.Event,
+                Location = mi.Location - Location
+            });
+            return mouseHandler != null;
+        }
 
-		public static Region Create(Viewport v, DockStyle d, int size, Action f, MouseEventHandler m)
+		public static Region Create(Viewport v, DockStyle d, int size, Action f, Action<MouseInput> m)
 		{
 			int2 s = MakeSize(v, d, size);
 
@@ -61,7 +68,7 @@ namespace OpenRa.Game.Graphics
 			}
 		}
 
-		Region(int2 location, int2 size, Viewport viewport, Action drawFunction, MouseEventHandler mouseHandler)
+		Region(int2 location, int2 size, Viewport viewport, Action drawFunction, Action<MouseInput> mouseHandler)
 		{
 			this.location = location;
 			this.Size = size;
diff --git a/OpenRa.Game/Graphics/TerrainRenderer.cs b/OpenRa.Game/Graphics/TerrainRenderer.cs
index cb6dca3f60..079be6f0ce 100644
--- a/OpenRa.Game/Graphics/TerrainRenderer.cs
+++ b/OpenRa.Game/Graphics/TerrainRenderer.cs
@@ -20,7 +20,7 @@ namespace OpenRa.Game.Graphics
 		public TerrainRenderer(Renderer renderer, Map map, Viewport viewport)
 		{
 			this.renderer = renderer;
-			region = Region.Create(viewport, DockStyle.Left, viewport.Width - 128, Draw, (_, e) => { } );
+			region = Region.Create(viewport, DockStyle.Left, viewport.Width - 128, Draw, null );
 			viewport.AddRegion(region);
 			this.map = map;
 
diff --git a/OpenRa.Game/Graphics/Viewport.cs b/OpenRa.Game/Graphics/Viewport.cs
index 1bc83e6b78..30f601967f 100644
--- a/OpenRa.Game/Graphics/Viewport.cs
+++ b/OpenRa.Game/Graphics/Viewport.cs
@@ -1,4 +1,6 @@
 using System.Collections.Generic;
+using System;
+using System.Linq;
 
 namespace OpenRa.Game.Graphics
 {
@@ -44,6 +46,18 @@ namespace OpenRa.Game.Graphics
 			renderer.EndFrame();
 		}
 
-		public IEnumerable<Region> Regions { get { return regions; } }
+        Region dragRegion = null;
+        public void DispatchMouseInput(MouseInput mi)
+        {
+            if (dragRegion != null) {
+                dragRegion.HandleMouseInput( mi );
+                if (mi.Event == MouseInputEvent.Up) dragRegion = null;
+                return;
+            }
+
+            dragRegion = regions.FirstOrDefault(r => r.Contains(mi.Location) && r.HandleMouseInput(mi));
+            if (mi.Event != MouseInputEvent.Down)
+                dragRegion = null;
+        }
 	}
 }
diff --git a/OpenRa.Game/Graphics/WorldRenderer.cs b/OpenRa.Game/Graphics/WorldRenderer.cs
index d060b4bbae..8c46ad7fda 100644
--- a/OpenRa.Game/Graphics/WorldRenderer.cs
+++ b/OpenRa.Game/Graphics/WorldRenderer.cs
@@ -15,7 +15,9 @@ namespace OpenRa.Game.Graphics
 			// TODO: this is layout policy. it belongs at a higher level than this.
 
 			region = Region.Create(world.game.viewport, DockStyle.Left,
-				world.game.viewport.Width - 128, Draw, world.game.controller.WorldClicked);		// TODO: world.WorldClicked is part of the CONTROLLER
+				world.game.viewport.Width - 128, Draw, 
+                world.game.controller.HandleMouseInput);		
+
 			world.game.viewport.AddRegion(region);
 
 			spriteRenderer = new SpriteRenderer(renderer, true);
diff --git a/OpenRa.Game/MainWindow.cs b/OpenRa.Game/MainWindow.cs
index 8b3c163eb0..37c869ecdd 100644
--- a/OpenRa.Game/MainWindow.cs
+++ b/OpenRa.Game/MainWindow.cs
@@ -66,16 +66,18 @@ namespace OpenRa.Game
 
 		int2 lastPos;
 
-		protected override void OnMouseDown(MouseEventArgs e)
-		{
-			base.OnMouseDown(e);
-			lastPos = new int2(e.Location);
+        protected override void OnMouseDown(MouseEventArgs e)
+        {
+            base.OnMouseDown(e);
+            lastPos = new int2(e.Location);
 
-			if (e.Button == MouseButtons.Left)
-				foreach (var region in game.viewport.Regions)
-					if (region.Contains(lastPos))
-						region.Clicked(e);
-		}
+            game.viewport.DispatchMouseInput(new MouseInput
+                {
+                    Button = e.Button,
+                    Event = MouseInputEvent.Down,
+                    Location = new int2(e.Location)
+                });
+        }
 
 		protected override void OnMouseMove(MouseEventArgs e)
 		{
@@ -88,9 +90,37 @@ namespace OpenRa.Game
 				lastPos = p;
 			}
 
+            game.viewport.DispatchMouseInput(new MouseInput
+            {
+                Button = e.Button,
+                Event = MouseInputEvent.Move,
+                Location = new int2(e.Location)
+            });
+
 			if (game.controller.orderGenerator != null)
 				game.controller.orderGenerator.PrepareOverlay(game, 
 					new int2(e.Location.X / 24, e.Location.Y / 24));
 		}
+
+        protected override void OnMouseUp(MouseEventArgs e)
+        {
+            base.OnMouseUp(e);
+
+            game.viewport.DispatchMouseInput(new MouseInput
+            {
+                Button = e.Button,
+                Event = MouseInputEvent.Up,
+                Location = new int2(e.Location)
+            });
+        }
 	}
+
+    struct MouseInput
+    {
+        public MouseInputEvent Event;
+        public int2 Location;
+        public MouseButtons Button;
+    }
+
+    enum MouseInputEvent { Down, Move, Up };
 }
diff --git a/OpenRa.Game/Sidebar.cs b/OpenRa.Game/Sidebar.cs
index 465776a8e2..6802ca2493 100644
--- a/OpenRa.Game/Sidebar.cs
+++ b/OpenRa.Game/Sidebar.cs
@@ -123,10 +123,13 @@ namespace OpenRa.Game
 			return null;
 		}
 
-		void MouseHandler(object sender, MouseEventArgs e)
+		void MouseHandler(MouseInput mi)
 		{
-			float2 point = new float2(e.Location);
-			Build(GetItem(point));
+            if (mi.Button == MouseButtons.Left && mi.Event == MouseInputEvent.Down)
+            {
+                var point = new float2(mi.Location.X, mi.Location.Y);
+                Build(GetItem(point));
+            }
 		}
 	}