Gtk#ScreenSpaceReserver.cs

//------------------------------------------------------------------//
//  This is a modified version of Xlib class from Docky to be used--//
//	to reserve screen space for dock-type apps----------------------//
//------------------------------------------------------------------//
using System;
using System.Runtime.InteropServices;

namespace Gtk
{
	public static class XLib
	{
		public enum Position
		{
			Bottom,
			Left,
			Top,
			Right
		}
		public enum Struts 
		{
			Left = 0,
			Right = 1,
			Top = 2,
			Bottom = 3,
			LeftStart = 4,
			LeftEnd = 5,
			RightStart = 6,
			RightEnd = 7,
			TopStart = 8,
			TopEnd = 9,
			BottomStart = 10,
			BottomEnd = 11
		}
		const string libX11 = "libX11";
		const string libGdkX11 = "libgdk-x11-2.0";

		[DllImport (libGdkX11)]
		static extern IntPtr gdk_x11_drawable_get_xid (IntPtr handle);

		[DllImport (libGdkX11)]
		static extern IntPtr gdk_x11_drawable_get_xdisplay (IntPtr handle);

		[DllImport (libGdkX11)]
		static extern IntPtr gdk_x11_display_get_xdisplay (IntPtr display);

		[DllImport (libX11)]
		public extern static IntPtr XOpenDisplay (IntPtr display);

		[DllImport (libX11)]
		public extern static int XInternAtoms (IntPtr display, string[] atom_names, int atom_count, bool only_if_exists, IntPtr[] atoms);

		[DllImport (libX11)]
		extern static int XChangeProperty (IntPtr display, IntPtr window, IntPtr property, IntPtr type, int format, int mode, IntPtr[] data, int nelements);

		[DllImport (libX11)]
		public extern static int XGetWindowProperty (IntPtr display, IntPtr window, IntPtr atom, IntPtr long_offset, 
			IntPtr long_length, bool delete, IntPtr req_type, out IntPtr actual_type, 
			out int actual_format, out IntPtr nitems, out IntPtr bytes_after, out IntPtr prop);

		public static IntPtr GdkWindowX11Xid (Gdk.Window window)
		{
			return gdk_x11_drawable_get_xid (window.Handle);
		}

		public static IntPtr GdkDrawableXDisplay (Gdk.Window window)
		{
			return gdk_x11_drawable_get_xdisplay (window.Handle);
		}

		public static IntPtr GdkDisplayXDisplay (Gdk.Display display)
		{
			return gdk_x11_display_get_xdisplay (display.Handle);
		}

		public static int XChangeProperty (Gdk.Window window, IntPtr property, IntPtr type, int mode, IntPtr[] data)
		{
			return XChangeProperty (GdkDrawableXDisplay (window), GdkWindowX11Xid (window), property, type, 32, mode, data, data.Length); 
		}

		public static void ReserveScreen (Gtk.Window window ,Position position, int size)
		{
			X11Atoms atoms = X11Atoms.Instance;

			Gdk.Screen screen = window.Screen;
			int Monitor;
			Monitor = screen.Number;
			Gdk.Rectangle monitor_geo;
			monitor_geo = screen.GetMonitorGeometry (Monitor);

			IntPtr [] struts = new IntPtr [12];

			IntPtr [] first_struts = new [] { struts [0], struts [1], struts [2], struts [3] };
			switch (position) {
			case Position.Bottom:
				{
					struts [(int) Struts.Bottom] = (IntPtr) (size + (screen.Height - (monitor_geo.Y + monitor_geo.Height)));
					struts [(int) Struts.BottomStart] = (IntPtr) monitor_geo.X;
					struts [(int) Struts.BottomEnd] = (IntPtr) (monitor_geo.X + monitor_geo.Width - 1);
				}
				break;
			case Position.Left:
				{
					struts [(int)Struts.Left] = (IntPtr)(monitor_geo.X + size);
					struts [(int)Struts.LeftStart] = (IntPtr)monitor_geo.Y;
					struts [(int)Struts.LeftEnd] = (IntPtr)(monitor_geo.Y + monitor_geo.Height - 1);
				}
				break;
			case Position.Top:
				{
					struts [(int)Struts.Top] = (IntPtr)(size + monitor_geo.Y);
					struts [(int)Struts.TopStart] = (IntPtr)monitor_geo.X;
					struts [(int)Struts.TopEnd] = (IntPtr)(monitor_geo.X + monitor_geo.Width - 1);
				}
				break;
			case Position.Right:
				{
					struts [(int) Struts.Right] = (IntPtr) (size + (screen.Width - (monitor_geo.X + monitor_geo.Width)));
					struts [(int) Struts.RightStart] = (IntPtr) monitor_geo.Y;
					struts [(int) Struts.RightEnd] = (IntPtr) (monitor_geo.Y + monitor_geo.Height - 1);
				}
				break;
			default:
				Console.WriteLine ("Error");
				break;
			}


			XChangeProperty (window.GdkWindow, atoms._NET_WM_STRUT_PARTIAL, (IntPtr)6,
				0, struts);

			XChangeProperty (window.GdkWindow, atoms._NET_WM_STRUT, (IntPtr)6, 
				0, first_struts);
		
		}
	}
	public class X11Atoms {

		static X11Atoms instance;
		public static X11Atoms Instance {
			get {
				if (instance == null)
					instance = new X11Atoms (Gdk.Screen.Default.Display);
				return instance;
			}
		}


		public readonly IntPtr _NET_WM_STRUT;
		public readonly IntPtr _NET_WM_STRUT_PARTIAL;

		X11Atoms (Gdk.Display dsp) {
			IntPtr display = XLib.GdkDisplayXDisplay (dsp);
			// make sure this array stays in sync with the statements below
			string [] atom_names = new string[] {
				"WM_PROTOCOLS",
				"WM_DELETE_WINDOW",
				"WM_TAKE_FOCUS",
				"_NET_SUPPORTED",
				"_NET_CLIENT_LIST",
				"_NET_NUMBER_OF_DESKTOPS",
				"_NET_DESKTOP_GEOMETRY",
				"_NET_DESKTOP_VIEWPORT",
				"_NET_CURRENT_DESKTOP",
				"_NET_DESKTOP_NAMES",
				"_NET_ACTIVE_WINDOW",
				"_NET_WORKAREA",
				"_NET_SUPPORTING_WM_CHECK",
				"_NET_VIRTUAL_ROOTS",
				"_NET_DESKTOP_LAYOUT",
				"_NET_SHOWING_DESKTOP",
				"_NET_CLOSE_WINDOW",
				"_NET_MOVERESIZE_WINDOW",
				"_NET_WM_MOVERESIZE",
				"_NET_RESTACK_WINDOW",
				"_NET_REQUEST_FRAME_EXTENTS",
				"_NET_WM_NAME",
				"_NET_WM_VISIBLE_NAME",
				"_NET_WM_ICON_NAME",
				"_NET_WM_VISIBLE_ICON_NAME",
				"_NET_WM_DESKTOP",
				"_NET_WM_WINDOW_TYPE",
				"_NET_WM_STATE",
				"_NET_WM_ALLOWED_ACTIONS",
				"_NET_WM_STRUT",
				"_NET_WM_STRUT_PARTIAL",
				"_NET_WM_ICON_GEOMETRY",
				"_NET_WM_ICON",
				"_NET_WM_PID",
				"_NET_WM_HANDLED_ICONS",
				"_NET_WM_USER_TIME",
				"_NET_FRAME_EXTENTS",
				"_NET_WM_PING",
				"_NET_WM_SYNC_REQUEST",
				"_NET_SYSTEM_TRAY_OPCODE",
				"_NET_SYSTEM_TRAY_ORIENTATION",
				"_NET_WM_STATE_MAXIMIZED_HORZ",
				"_NET_WM_STATE_MAXIMIZED_VERT",
				"_NET_WM_STATE_HIDDEN",
				"_XEMBED",
				"_XEMBED_INFO",
				"_MOTIF_WM_HINTS",
				"_NET_WM_STATE_SKIP_TASKBAR",
				"_NET_WM_STATE_ABOVE",
				"_NET_WM_STATE_MODAL",
				"_NET_WM_CONTEXT_HELP",
				"_NET_WM_WINDOW_OPACITY",
				"_NET_WM_WINDOW_TYPE_DESKTOP",
				"_NET_WM_WINDOW_TYPE_DOCK",
				"_NET_WM_WINDOW_TYPE_TOOLBAR",
				"_NET_WM_WINDOW_TYPE_MENU",
				"_NET_WM_WINDOW_TYPE_UTILITY",
				"_NET_WM_WINDOW_TYPE_DIALOG",
				"_NET_WM_WINDOW_TYPE_SPLASH",
				"_NET_WM_WINDOW_TYPE_NORMAL",
				"_COMPIZ_WM_WINDOW_BLUR",
				"CLIPBOARD",
				"PRIMARY",
				"COMPOUND_TEXT",
				"UTF8_STRING",
				"TARGETS",
				"_SWF_AsyncAtom",
				"_SWF_PostMessageAtom",
				"_SWF_HoverAtom",
			};

			IntPtr[] atoms = new IntPtr [atom_names.Length];;
			Console.WriteLine (atom_names.Length);
			XLib.XInternAtoms (display, atom_names, 69, false, atoms);

			_NET_WM_STRUT = atoms [29];
			_NET_WM_STRUT_PARTIAL = atoms [30];
		}

	}

}