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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- */
/* Copyright (C) 1998 Redhat Software Inc.
* Code available under the Gnu GPL.
* Authors: Owen Taylor <otaylor@redhat.com>
*/
#include <gtk/gtk.h>
#include <gdk/gdkx.h>
#include <libgnome/libgnome.h>
#include "wm-properties.h"
typedef struct _RestartInfo RestartInfo;
struct _RestartInfo {
GnomeDesktopEntry *dentry;
gint retries;
WMResultFunc callback;
gpointer data;
};
gboolean
wm_is_running (void)
{
gboolean result;
gboolean old_warnings = gdk_error_warnings;
guint old_mask;
XWindowAttributes attrs;
gdk_error_warnings = FALSE;
gdk_error_code = 0;
XGetWindowAttributes (GDK_DISPLAY(), GDK_ROOT_WINDOW(), &attrs);
XSelectInput (GDK_DISPLAY(), GDK_ROOT_WINDOW(),
SubstructureRedirectMask);
XSync (GDK_DISPLAY(), False);
if (gdk_error_code == 0) {
result = FALSE;
XSelectInput (GDK_DISPLAY(), GDK_ROOT_WINDOW(),
attrs.your_event_mask);
} else
result = TRUE;
gdk_error_warnings = old_warnings;
return result;
}
/* Cut and paste from gnome-libs/gnome_win_hints_wm_exists, except that we
* return the xid instead of a window
*/
static Window
find_gnome_wm_window(void)
{
Atom r_type;
int r_format;
unsigned long count;
unsigned long bytes_remain;
unsigned char *prop, *prop2;
gint prev_error;
GdkAtom cardinal_atom = gdk_atom_intern ("CARDINAL", FALSE);
prev_error = gdk_error_warnings;
gdk_error_warnings = 0;
if (XGetWindowProperty(GDK_DISPLAY(), GDK_ROOT_WINDOW(),
gdk_atom_intern ("_WIN_SUPPORTING_WM_CHECK", FALSE),
0, 1, False, cardinal_atom,
&r_type, &r_format,
&count, &bytes_remain, &prop) == Success && prop)
{
if (r_type == cardinal_atom && r_format == 32 && count == 1)
{
Window n = *(long *)prop;
if (XGetWindowProperty(GDK_DISPLAY(), n,
gdk_atom_intern ("_WIN_SUPPORTING_WM_CHECK", FALSE),
0, 1, False, cardinal_atom,
&r_type, &r_format, &count, &bytes_remain,
&prop2) == Success && prop)
{
if (r_type == cardinal_atom && r_format == 32 && count == 1)
{
XFree(prop);
XFree(prop2);
gdk_error_warnings = prev_error;
return n;
}
XFree(prop2);
}
}
XFree(prop);
}
gdk_error_warnings = prev_error;
return None;
}
static Window
find_wm_window_from_client (GdkWindow *client)
{
Window window, frame, parent, root;
Window *children;
unsigned int nchildren;
gboolean old_warnings;
if (!client)
return None;
frame = None;
window = GDK_WINDOW_XWINDOW (client);
old_warnings = gdk_error_warnings;
gdk_error_warnings = FALSE;
gdk_error_code = 0;
while (XQueryTree (GDK_DISPLAY(), window,
&root, &parent, &children, &nchildren) &&
(gdk_error_code == 0)) {
if (children)
XFree(children);
if (window == root)
break;
if (root == parent) {
frame = window;
break;
}
window = parent;
}
gdk_error_warnings = old_warnings;
return frame;
}
static gboolean
window_has_wm_state (Window window)
{
Atom r_type;
int r_format;
unsigned long count;
unsigned long bytes_remain;
unsigned char *prop;
if (XGetWindowProperty(GDK_DISPLAY(), window,
gdk_atom_intern ("WM_STATE", FALSE),
0, 0, False, AnyPropertyType,
&r_type, &r_format,
&count, &bytes_remain, &prop) == Success) {
if (r_type != None) {
XFree(prop);
return TRUE;
}
}
return FALSE;
}
static gboolean
descendent_has_wm_state (Window window)
{
gboolean result = FALSE;
Window parent, root;
Window *children;
unsigned int nchildren;
gint i;
if (!XQueryTree (GDK_DISPLAY(), window,
&root, &parent, &children, &nchildren))
return FALSE;
for (i=0; i<nchildren; i++) {
if (window_has_wm_state (children[i]) ||
descendent_has_wm_state (children[i])) {
result = TRUE;
break;
}
}
if (children)
XFree (children);
return result;
}
/* This function tries to find a window manager frame by
* hunting all the children of the root window
*/
static Window
find_wm_window_from_hunt (void)
{
Window parent, root, frame;
Window *children;
unsigned int nchildren;
gboolean old_warnings;
gint i;
frame = None;
old_warnings = gdk_error_warnings;
gdk_error_warnings = FALSE;
gdk_error_code = 0;
XQueryTree (GDK_DISPLAY(), gdk_root_window,
&root, &parent, &children, &nchildren);
/* We are looking for a window that doesn't have WIN_STATE
* set on it, but does have a child with WIN_STATE set
*/
for (i=0; i<nchildren; i++) {
if (!window_has_wm_state (children[i]) &&
descendent_has_wm_state (children[i])) {
frame = children[i];
break;
}
}
if (children)
XFree (children);
gdk_error_warnings = old_warnings;
return frame;
}
static Window
find_wm_window (GdkWindow *client)
{
Window wm_window = None;
/* First, try to find a GNOME compliant WM */
wm_window = find_gnome_wm_window();
if (!wm_window) {
wm_window = find_wm_window_from_client (client);
}
if (!wm_window) {
wm_window = find_wm_window_from_hunt ();
}
return wm_window;
}
static gboolean
start_timeout (gpointer data)
{
RestartInfo *info = data;
if (wm_is_running ()) {
info->callback(WM_SUCCESS, info->data);
gnome_desktop_entry_free (info->dentry);
g_free (info);
return FALSE;
} else {
info->retries--;
if (info->retries > 0)
return TRUE;
else {
info->callback(WM_CANT_START, info->data);
gnome_desktop_entry_free (info->dentry);
g_free (info);
return FALSE;
}
}
}
static void
start_do (RestartInfo *info)
{
gnome_desktop_entry_launch (info->dentry);
info->retries = 10;
gtk_timeout_add (1000, start_timeout, info);
}
static gboolean
kill_timeout (gpointer data)
{
RestartInfo *info = data;
if (!wm_is_running ()) {
start_do (info);
return FALSE;
} else {
info->retries--;
if (info->retries > 0)
return TRUE;
else {
info->callback(WM_ALREADY_RUNNING, info->data);
gnome_desktop_entry_free (info->dentry);
g_free (info);
return FALSE;
}
}
}
void
wm_restart (WindowManager *new,
GdkWindow *client,
WMResultFunc callback,
gpointer data)
{
Window wm_window;
RestartInfo *info;
g_return_if_fail (new->is_present);
info = g_new (RestartInfo, 1);
info->dentry = gnome_desktop_entry_copy (new->dentry);
info->callback = callback;
info->data = data;
info->retries = 10;
if (wm_is_running ()) {
wm_window = find_wm_window (client);
if (!wm_window) {
(*callback) (WM_ALREADY_RUNNING, data);
gnome_desktop_entry_free (info->dentry);
g_free (info);
} else {
XKillClient (GDK_DISPLAY(), wm_window);
gtk_timeout_add (1000, kill_timeout, info);
}
} else {
start_do (info);
}
}
WindowManager *
wm_guess_current (void)
{
return NULL;
}
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