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/*
* mini-wm.c - simple keyboard focus handling 'wm'.
*
* Copyright (C) 2002 Red Hat, Inc. All rights reserved.
*
* 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, see <http://www.gnu.org/licenses/>.
*
* Author(s): Owen Taylor <otaylor@redhat.com>
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <gdk/gdkx.h>
#include <gtk/gtk.h>
static gboolean
is_focusable (Window window)
{
Display *xdisplay = GDK_DISPLAY ();
XWindowAttributes xwa;
gboolean result = FALSE;
gdk_error_trap_push ();
if (XGetWindowAttributes (xdisplay, window, &xwa))
{
if (!xwa.override_redirect && xwa.map_state == IsViewable)
result = TRUE;
}
gdk_error_trap_pop ();
return result;
}
static void
check_focus ()
{
Window *children;
unsigned int n_children;
Window root;
Window parent;
XQueryTree (GDK_DISPLAY(), GDK_ROOT_WINDOW(),
&root, &parent, &children, &n_children);
while (n_children > 0) {
if (is_focusable (children[n_children-1])) {
gdk_error_trap_push ();
XSetInputFocus (GDK_DISPLAY(), children[n_children-1],
RevertToPointerRoot, CurrentTime);
XSync (GDK_DISPLAY(), 0);
if (gdk_error_trap_pop () == 0)
break;
}
n_children--;
}
XFree (children);
}
GdkFilterReturn
mini_wm_root_filter (GdkXEvent *xevent,
GdkEvent *event,
gpointer data)
{
XEvent *xev = xevent;
if (xev->xany.type == MapNotify ||
xev->xany.type == UnmapNotify ||
xev->xany.type == ConfigureNotify ||
xev->xany.type == DestroyNotify)
{
check_focus ();
}
return GDK_FILTER_CONTINUE;
}
void
mini_wm_start (void)
{
XWindowAttributes attrs;
XGetWindowAttributes (GDK_DISPLAY(), GDK_ROOT_WINDOW(), &attrs);
XSelectInput (GDK_DISPLAY(), GDK_ROOT_WINDOW(),
attrs.your_event_mask | SubstructureNotifyMask);
gdk_window_add_filter (GDK_ROOT_PARENT (), mini_wm_root_filter, NULL);
check_focus ();
}
int main( int argc,
char *argv[] )
{
gtk_init (&argc, &argv);
mini_wm_start ();
/* Indicate back to anaconda that we now have established
* connection to the display. */
if (write(1, "#", 1) == -1) abort();
gtk_main();
return(0);
}
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