ewmhints.c

ReactOS是一些高手根据Windows XP的内核编写出的类XP。内核实现机理和API函数调用几乎相同。甚至可以兼容XP的程序。喜欢研究系统内核的人可以看一看。

/* -*- c-basic-offset: 8 -*-
   rdesktop: A Remote Desktop Protocol client.

   Support functions for Extended Window Manager Hints,
   http://www.freedesktop.org/wiki/Standards_2fwm_2dspec

   Copyright (C) Peter Astrand <[e-mail]> 2005
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <X11/Xutil.h>
#include "rdesktop.h"

#define _NET_WM_STATE_REMOVE        0	/* remove/unset property */
#define _NET_WM_STATE_ADD           1	/* add/set property */
#define _NET_WM_STATE_TOGGLE        2	/* toggle property  */

/* 
   Get window property value (32 bit format) 
   Returns zero on success, -1 on error
*/
static int
get_property_value(RDPCLIENT * This, Window wnd, char *propname, long max_length,
		   unsigned long *nitems_return, unsigned char **prop_return, int nowarn)
{
	int result;
	Atom property;
	Atom actual_type_return;
	int actual_format_return;
	unsigned long bytes_after_return;

	property = XInternAtom(This->display, propname, True);
	if (property == None)
	{
		fprintf(stderr, "Atom %s does not exist\n", propname);
		return (-1);
	}

	result = XGetWindowProperty(This->display, wnd, property, 0,	/* long_offset */
				    max_length,	/* long_length */
				    False,	/* delete */
				    AnyPropertyType,	/* req_type */
				    &actual_type_return,
				    &actual_format_return,
				    nitems_return, &bytes_after_return, prop_return);

	if (result != Success)
	{
		fprintf(stderr, "XGetWindowProperty failed\n");
		return (-1);
	}

	if (actual_type_return == None || actual_format_return == 0)
	{
		if (!nowarn)
			fprintf(stderr, "Window is missing property %s\n", propname);
		return (-1);
	}

	if (bytes_after_return)
	{
		fprintf(stderr, "%s is too big for me\n", propname);
		return (-1);
	}

	if (actual_format_return != 32)
	{
		fprintf(stderr, "%s has bad format\n", propname);
		return (-1);
	}

	return (0);
}

/* 
   Get current desktop number
   Returns -1 on error
*/
static int
get_current_desktop(RDPCLIENT * This)
{
	unsigned long nitems_return;
	unsigned char *prop_return;
	int current_desktop;

	if (get_property_value
	    (This, DefaultRootWindow(This->display), "_NET_CURRENT_DESKTOP", 1, &nitems_return,
	     &prop_return, 0) < 0)
		return (-1);

	if (nitems_return != 1)
	{
		fprintf(stderr, "_NET_CURRENT_DESKTOP has bad length\n");
		return (-1);
	}

	current_desktop = *prop_return;
	XFree(prop_return);
	return current_desktop;
}

/*
  Get workarea geometry
  Returns zero on success, -1 on error
 */

int
get_current_workarea(RDPCLIENT * This, uint32 * x, uint32 * y, uint32 * width, uint32 * height)
{
	int current_desktop;
	unsigned long nitems_return;
	unsigned char *prop_return;
	uint32 *return_words;
	const uint32 net_workarea_x_offset = 0;
	const uint32 net_workarea_y_offset = 1;
	const uint32 net_workarea_width_offset = 2;
	const uint32 net_workarea_height_offset = 3;
	const uint32 max_prop_length = 32 * 4;	/* Max 32 desktops */

	if (get_property_value
	    (This, DefaultRootWindow(This->display), "_NET_WORKAREA", max_prop_length, &nitems_return,
	     &prop_return, 0) < 0)
		return (-1);

	if (nitems_return % 4)
	{
		fprintf(stderr, "_NET_WORKAREA has odd length\n");
		return (-1);
	}

	current_desktop = get_current_desktop(This);

	if (current_desktop < 0)
		return -1;

	return_words = (uint32 *) prop_return;

	*x = return_words[current_desktop * 4 + net_workarea_x_offset];
	*y = return_words[current_desktop * 4 + net_workarea_y_offset];
	*width = return_words[current_desktop * 4 + net_workarea_width_offset];
	*height = return_words[current_desktop * 4 + net_workarea_height_offset];

	XFree(prop_return);

	return (0);

}



void
ewmh_init(RDPCLIENT * This)
{
	/* FIXME: Use XInternAtoms */
	This->ewmhints.state_maximized_vert_atom =
		XInternAtom(This->display, "_NET_WM_STATE_MAXIMIZED_VERT", False);
	This->ewmhints.state_maximized_horz_atom =
		XInternAtom(This->display, "_NET_WM_STATE_MAXIMIZED_HORZ", False);
	This->ewmhints.state_hidden_atom = XInternAtom(This->display, "_NET_WM_STATE_HIDDEN", False);
	This->ewmhints.state_skip_taskbar_atom =
		XInternAtom(This->display, "_NET_WM_STATE_SKIP_TASKBAR", False);
	This->ewmhints.state_skip_pager_atom = XInternAtom(This->display, "_NET_WM_STATE_SKIP_PAGER", False);
	This->ewmhints.state_modal_atom = XInternAtom(This->display, "_NET_WM_STATE_MODAL", False);
	This->net_wm_state_atom = XInternAtom(This->display, "_NET_WM_STATE", False);
	This->net_wm_desktop_atom = XInternAtom(This->display, "_NET_WM_DESKTOP", False);
	This->ewmhints.name_atom = XInternAtom(This->display, "_NET_WM_NAME", False);
	This->ewmhints.utf8_string_atom = XInternAtom(This->display, "UTF8_STRING", False);
}


/* 
   Get the window state: normal/minimized/maximized. 
*/
#ifndef MAKE_PROTO
int
ewmh_get_window_state(RDPCLIENT * This, Window w)
{
	unsigned long nitems_return;
	unsigned char *prop_return;
	uint32 *return_words;
	unsigned long item;
	BOOL maximized_vert, maximized_horz, hidden;

	maximized_vert = maximized_horz = hidden = False;

	if (get_property_value(This, w, "_NET_WM_STATE", 64, &nitems_return, &prop_return, 0) < 0)
		return SEAMLESSRDP_NORMAL;

	return_words = (uint32 *) prop_return;

	for (item = 0; item < nitems_return; item++)
	{
		if (return_words[item] == This->ewmhints.state_maximized_vert_atom)
			maximized_vert = True;
		if (return_words[item] == This->ewmhints.state_maximized_horz_atom)
			maximized_horz = True;
		if (return_words[item] == This->ewmhints.state_hidden_atom)
			hidden = True;
	}

	XFree(prop_return);

	if (maximized_vert && maximized_horz)
		return SEAMLESSRDP_MAXIMIZED;
	else if (hidden)
		return SEAMLESSRDP_MINIMIZED;
	else
		return SEAMLESSRDP_NORMAL;
}

static int
ewmh_modify_state(RDPCLIENT * This, Window wnd, int add, Atom atom1, Atom atom2)
{
	Status status;
	XEvent xevent;

	int result;
	unsigned long nitems;
	unsigned char *props;
	uint32 state = WithdrawnState;

	/* The spec states that the window manager must respect any
	   _NET_WM_STATE attributes on a withdrawn window. In order words, we
	   modify the attributes directly for withdrawn windows and ask the WM
	   to do it for active windows. */
	result = get_property_value(This, wnd, "WM_STATE", 64, &nitems, &props, 1);
	if ((result >= 0) && nitems)
	{
		state = *(uint32 *) props;
		XFree(props);
	}

	if (state == WithdrawnState)
	{
		if (add)
		{
			Atom atoms[2];

			atoms[0] = atom1;
			nitems = 1;
			if (atom2)
			{
				atoms[1] = atom2;
				nitems = 2;
			}

			XChangeProperty(This->display, wnd, This->net_wm_state_atom, XA_ATOM,
					32, PropModeAppend, (unsigned char *) atoms, nitems);
		}
		else
		{
			Atom *atoms;
			int i;

			if (get_property_value(This, wnd, "_NET_WM_STATE", 64, &nitems, &props, 1) < 0)
				return 0;

			atoms = (Atom *) props;

			for (i = 0; i < nitems; i++)
			{
				if ((atoms[i] == atom1) || (atom2 && (atoms[i] == atom2)))
				{
					if (i != (nitems - 1))
						memmove(&atoms[i], &atoms[i + 1],
							sizeof(Atom) * (nitems - i - 1));
					nitems--;
					i--;
				}
			}

			XChangeProperty(This->display, wnd, This->net_wm_state_atom, XA_ATOM,
					32, PropModeReplace, (unsigned char *) atoms, nitems);

			XFree(props);
		}

		return 0;
	}

	xevent.type = ClientMessage;
	xevent.xclient.window = wnd;
	xevent.xclient.message_type = This->net_wm_state_atom;
	xevent.xclient.format = 32;
	if (add)
		xevent.xclient.data.l[0] = _NET_WM_STATE_ADD;
	else
		xevent.xclient.data.l[0] = _NET_WM_STATE_REMOVE;
	xevent.xclient.data.l[1] = atom1;
	xevent.xclient.data.l[2] = atom2;
	xevent.xclient.data.l[3] = 0;
	xevent.xclient.data.l[4] = 0;
	status = XSendEvent(This->display, DefaultRootWindow(This->display), False,
			    SubstructureNotifyMask | SubstructureRedirectMask, &xevent);
	if (!status)
		return -1;

	return 0;
}

/* 
   Set the window state: normal/minimized/maximized. 
   Returns -1 on failure. 
*/
int
ewmh_change_state(RDPCLIENT * This, Window wnd, int state)
{
	/*
	 * Deal with the max atoms
	 */
	if (state == SEAMLESSRDP_MAXIMIZED)
	{
		if (ewmh_modify_state
		    (This, wnd, 1, This->ewmhints.state_maximized_vert_atom,
		     This->ewmhints.state_maximized_horz_atom) < 0)
			return -1;
	}
	else
	{
		if (ewmh_modify_state
		    (This, wnd, 0, This->ewmhints.state_maximized_vert_atom,
		     This->ewmhints.state_maximized_horz_atom) < 0)
			return -1;
	}

	return 0;
}


int
ewmh_get_window_desktop(RDPCLIENT * This, Window wnd)
{
	unsigned long nitems_return;
	unsigned char *prop_return;
	int desktop;

	if (get_property_value(This, wnd, "_NET_WM_DESKTOP", 1, &nitems_return, &prop_return, 0) < 0)
		return (-1);

	if (nitems_return != 1)
	{
		fprintf(stderr, "_NET_WM_DESKTOP has bad length\n");
		return (-1);
	}

	desktop = *prop_return;
	XFree(prop_return);
	return desktop;
}


int
ewmh_move_to_desktop(RDPCLIENT * This, Window wnd, unsigned int desktop)
{
	Status status;
	XEvent xevent;

	xevent.type = ClientMessage;
	xevent.xclient.window = wnd;
	xevent.xclient.message_type = This->net_wm_desktop_atom;
	xevent.xclient.format = 32;
	xevent.xclient.data.l[0] = desktop;
	xevent.xclient.data.l[1] = 0;
	xevent.xclient.data.l[2] = 0;
	xevent.xclient.data.l[3] = 0;
	xevent.xclient.data.l[4] = 0;
	status = XSendEvent(This->display, DefaultRootWindow(This->display), False,
			    SubstructureNotifyMask | SubstructureRedirectMask, &xevent);
	if (!status)
		return -1;

	return 0;
}

void
ewmh_set_wm_name(RDPCLIENT * This, Window wnd, const char *title)
{
	int len;

	len = strlen(title);
	XChangeProperty(This->display, wnd, This->ewmhints.name_atom, This->ewmhints.utf8_string_atom,
			8, PropModeReplace, (unsigned char *) title, len);
}


int
ewmh_set_window_popup(RDPCLIENT * This, Window wnd)
{
	if (ewmh_modify_state
	    (This, wnd, 1, This->ewmhints.state_skip_taskbar_atom, This->ewmhints.state_skip_pager_atom) < 0)
		return -1;
	return 0;
}

int
ewmh_set_window_modal(RDPCLIENT * This, Window wnd)
{
	if (ewmh_modify_state(This, wnd, 1, This->ewmhints.state_modal_atom, 0) < 0)
		return -1;
	return 0;
}

#endif /* MAKE_PROTO */


#if 0

/* FIXME: _NET_MOVERESIZE_WINDOW is for pagers, not for
   applications. We should implement _NET_WM_MOVERESIZE instead */

int
ewmh_net_moveresize_window(RDPCLIENT * This, Window wnd, int x, int y, int width, int height)
{
	Status status;
	XEvent xevent;
	Atom moveresize;

	moveresize = XInternAtom(This->display, "_NET_MOVERESIZE_WINDOW", False);
	if (!moveresize)
	{
		return -1;
	}

	xevent.type = ClientMessage;
	xevent.xclient.window = wnd;
	xevent.xclient.message_type = moveresize;
	xevent.xclient.format = 32;
	xevent.xclient.data.l[0] = StaticGravity | (1 << 8) | (1 << 9) | (1 << 10) | (1 << 11);
	xevent.xclient.data.l[1] = x;
	xevent.xclient.data.l[2] = y;
	xevent.xclient.data.l[3] = width;
	xevent.xclient.data.l[4] = height;

	status = XSendEvent(This->display, DefaultRootWindow(This->display), False,
			    SubstructureNotifyMask | SubstructureRedirectMask, &xevent);
	if (!status)
		return -1;
	return 0;
}

#endif