* Source/OpenTK/NativeWindow.cs:

* Source/OpenTK/INativeWindow.cs:
* Source/OpenTK/Platform/X11/API.cs:
* Source/OpenTK/Platform/X11/X11GLNative.cs:
* Source/OpenTK/Platform/Windows/WinGLNative.cs:
* Source/OpenTK/Platform/MacOS/CarbonGLNative.cs:
* Source/Examples/OpenTK/Test/GameWindowStates.cs: Initial
  implementation of CursorVisible API. See issue [#1560].

Source/Examples/OpenTK/Test/GameWindowStates.cs

@@ -23,6 +23,7 @@ namespace Examples.Tests
         bool mouse_in_window = false;
         bool viewport_changed = true;
         bool refresh_text = true;
+        bool move_window = false;
 
         public GameWindowStates()
             : base(800, 600)
@@ -38,7 +39,8 @@ namespace Examples.Tests
             Resize += delegate { refresh_text = true; };
             WindowBorderChanged += delegate { refresh_text = true; };
             WindowStateChanged += delegate { refresh_text = true; };
-            Mouse.Move += delegate { refresh_text = true; };
+            Mouse.Move += MouseMoveHandler;
+            Mouse.ButtonDown += MouseButtonHandler;
         }
 
         void KeyDownHandler(object sender, KeyboardKeyEventArgs e)
@@ -69,6 +71,32 @@ namespace Examples.Tests
             }
         }
 
+        void MouseMoveHandler(object sender, MouseMoveEventArgs e)
+        {
+            refresh_text = true;
+
+            if (move_window)
+            {
+                Location = new Point(X + e.XDelta, Y + e.YDelta);
+            }
+        }
+
+        void MouseButtonHandler(object sender, MouseButtonEventArgs e)
+        {
+            refresh_text = true;
+
+            if (e.IsPressed)
+            {
+                CursorVisible = false;
+                move_window = true;
+            }
+            else
+            {
+                CursorVisible = true;
+                move_window = false;
+            }
+        }
+
         static int Clamp(int val, int min, int max)
         {
             return val > max ? max : val < min ? min : val;
@@ -97,6 +125,7 @@ namespace Examples.Tests
                     DrawString(gfx, String.Format("Focused: {0}.", this.Focused), line++);
                     DrawString(gfx, String.Format("Mouse {0} window.", mouse_in_window ? "inside" : "outside of"), line++);
                     DrawString(gfx, String.Format("Mouse position: {0}", new Vector3(Mouse.X, Mouse.Y, Mouse.Wheel)), line++);
+                    DrawString(gfx, String.Format("Mouse visible: {0}", CursorVisible), line++);
                     DrawString(gfx, String.Format("Window.Bounds: {0}", Bounds), line++);
                     DrawString(gfx, String.Format("Window.Location: {0}, Size: {1}", Location, Size), line++);
                     DrawString(gfx, String.Format("Window.{{X={0}, Y={1}, Width={2}, Height={3}}}", X, Y, Width, Height), line++);

Source/OpenTK/INativeWindow.cs

@@ -132,6 +132,16 @@ namespace OpenTK
         [Obsolete]
         OpenTK.Input.IInputDriver InputDriver { get; }
 
+        /// <summary>
+        /// Gets or sets a value, indicating whether the mouse cursor is visible.
+        /// </summary>
+        bool CursorVisible { get; set; }
+
+//        /// <summary>
+//        /// Gets or sets a value, indicating whether the mouse cursor is confined inside the window size.
+//        /// </summary>
+//        bool CursorGrabbed { get; set; }
+
         /// <summary>
         /// Closes this window.
         /// </summary>

Source/OpenTK/NativeWindow.cs

@@ -49,6 +49,7 @@ namespace OpenTK
         private readonly INativeWindow implementation;
 
         private bool disposed, events;
+        private bool cursor_visible = true;
 
         #endregion
 
@@ -541,6 +542,23 @@ namespace OpenTK
 
         #endregion
 
+        #region CursorVisible
+
+        /// <summary>
+        /// Gets or sets a value indicating whether the mouse cursor is visible.
+        /// </summary>
+        public bool CursorVisible
+        {
+            get { return cursor_visible; }
+            set
+            {
+                cursor_visible = value;
+                implementation.CursorVisible = value;
+            }
+        }
+
+        #endregion
+
         #endregion
 
         #region Events

Source/OpenTK/Platform/MacOS/CarbonGLNative.cs

@@ -925,6 +925,12 @@ namespace OpenTK.Platform.MacOS
             }
         }
 
+        public bool CursorVisible
+        {
+            get { return true; }
+            set { }
+        }
+
         public void Close()
         {
 			CancelEventArgs e = new CancelEventArgs();

Source/OpenTK/Platform/Windows/WinGLNative.cs

@@ -838,6 +838,16 @@ namespace OpenTK.Platform.Windows
 
         #endregion
         
+        #region CursorVisible
+        
+        public bool CursorVisible
+        {
+            get { return true; }
+            set { }
+        }
+        
+        #endregion
+
         #region Close
 
         public void Close()

Source/OpenTK/Platform/X11/API.cs

@@ -1562,6 +1562,26 @@ XF86VidModeGetGammaRampSize(
         #endregion
 
         #endregion
+
+        public static Pixmap XCreateBitmapFromData(Display display, Window d, byte[,] data)
+        {
+            if (data == null)
+                throw new ArgumentNullException("data");
+
+            unsafe
+            {
+                fixed (byte* pdata = data)
+                {
+                    return XCreateBitmapFromData(display, d, pdata, data.GetLength(0), data.GetLength(1));
+                }
+            }
+        }
+
+        [DllImport(X11Library)]
+        unsafe public static extern Pixmap XCreateBitmapFromData(Display display, Window d, byte* data, int width, int height);
+
+        [DllImport("libX11", EntryPoint = "XAllocColor")]
+        public static extern Status XAllocNamedColor(Display display, Colormap colormap, string color_name, out XColor screen_def_return, out XColor exact_def_return);
     }
     /*
     [StructLayout(LayoutKind.Sequential)]

Source/OpenTK/Platform/X11/X11GLNative.cs

@@ -1300,6 +1300,38 @@ namespace OpenTK.Platform.X11
         
         #endregion
 
+        public bool CursorVisible
+        {
+            get { return true; }
+            set
+            {
+                if (value)
+                {
+                    using (new XLock(window.Display))
+                    {
+                        Functions.XUndefineCursor(window.Display, window.WindowHandle);
+                    }
+                }
+                else
+                {
+                    using (new XLock(window.Display))
+                    {
+                        XColor black, dummy;
+                        IntPtr cmap = Functions.XDefaultColormap(window.Display, window.Screen);
+                        Functions.XAllocNamedColor(window.Display, cmap, "black", out black, out dummy);
+                        IntPtr bmp_empty = Functions.XCreateBitmapFromData(window.Display,
+                            window.WindowHandle, new byte[,] { { 0 } });
+                        IntPtr cursor_empty = Functions.XCreatePixmapCursor(window.Display,
+                        bmp_empty, bmp_empty, ref black, ref black, 0, 0);
+
+                        Functions.XDefineCursor(window.Display, window.WindowHandle, cursor_empty);
+
+                        Functions.XFreeCursor(window.Display, cursor_empty);
+                    }
+                }
+            }
+        }
+
         #endregion
 
         #region --- INativeGLWindow Members ---