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gnome-control-center/libwindow-settings/gnome-wm-manager.c
Jody Goldberg 9c3e90995d handle NULL. 
2002-08-26  Jody Goldberg <jody@gnome.org>

	* gnome-wm-manager.c (gnome_wm_manager_get_current) : handle NULL.
2002-09-10 04:04:31 +00:00

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#include <config.h>
#include "gnome-wm-manager.h"
#include "wm-properties.h"
#include <gtk/gtk.h>
#include <libgnomeui/gnome-client.h>
#include <gnome.h>
/* prototypes */
static void restart (gboolean force);
static void revert_callback (void);
static void cancel_callback (void);
static void update_session (void);
static WindowManager *selected_wm = NULL;
/* Enumeration describing the current state of the capplet.
* in any other state than idle, all controls are !sensitive.
*/
typedef enum {
STATE_IDLE,
STATE_TRY,
STATE_REVERT,
STATE_OK,
STATE_CANCEL,
STATE_TRY_REVERT, /* Currently trying, revert afterwards */
STATE_TRY_CANCEL /* Currently trying, cancel afterwards */
} StateType;
/* Current state
*/
static StateType state = STATE_IDLE;
/* Set TRUE when we've exited the main loop, but restart_pending
*/
static gboolean quit_pending = FALSE;
/* Set TRUE when we're waiting for the WM to restart
*/
static gboolean restart_pending = FALSE;
static GtkWidget *capplet;
void
gnome_wm_manager_init (GtkWidget *some_window)
{
wm_list_init();
selected_wm = wm_list_get_current();
}
GList *
gnome_wm_manager_get_list (void)
{
GList *wm_ditem;
GList *wms = NULL;
GnomeDesktopItem *ditem;
for (wm_ditem = window_managers; wm_ditem != NULL; wm_ditem = wm_ditem->next) {
ditem = ((WindowManager *)wm_ditem->data)->dentry;
wms = g_list_prepend (wms, gnome_window_manager_new (ditem));
}
return wms;
}
void
gnome_wm_manager_set_current (GnomeWindowManager *wm)
{
/* this line is bogus */
/*selected_wm = gnome_window_manager_get_ditem (wm);*/
}
GnomeWindowManager *
gnome_wm_manager_get_current (void)
{
WindowManager *current_wm = wm_list_get_current();
if (current_wm == NULL)
return NULL;
return GNOME_WINDOW_MANAGER (gnome_window_manager_new (current_wm->dentry));
}
void gnome_wm_manager_change_wm_to_settings (void)
{
state = STATE_TRY;
restart(FALSE);
wm_list_set_current (selected_wm);
wm_list_save ();
update_session ();
}
gboolean
gnome_wm_manager_same_wm (GnomeWindowManager *wm1, GnomeWindowManager *wm2)
{
GnomeDesktopItem *item1, *item2;
const char *location1, *location2;
gboolean same;
item1 = gnome_window_manager_get_ditem (wm1);
item2 = gnome_window_manager_get_ditem (wm2);
location1 = gnome_desktop_item_get_location (item1);
location2 = gnome_desktop_item_get_location (item2);
same = (strcmp (location1, location2) == 0);
gnome_desktop_item_unref (item1);
gnome_desktop_item_unref (item2);
return same;
}
static GtkWidget *restart_dialog = NULL;
static GtkWidget *restart_label = NULL;
static guint restart_dialog_timeout;
static gchar *restart_name = NULL;
/* Time until dialog times out */
static gdouble restart_remaining_time;
static gint restart_displayed_time;
static GnomeClient *client = NULL;
/* The possible transitions between states are described below.
*
* operation | try revert ok cancel finish
* ===========+=================================================
* IDLE | TRY REVERT OK CANCEL
* TRY | TRY_REVERT OK TRY_CANCEL IDLE
* REVERT | CANCEL CANCEL IDLE
* OK | (quit)
* CANCEL | (quit)
* TRY_REVERT | TRY_CANCEL TRY_CANCEL REVERT
* TRY_CANCEL | CANCEL
*
* When a restart fails, there are three cases
*
* (1) The failure was because the current window manager didn't
* die. We inform the user of the situation, and then
* abort the operation.
*
* (2) The window manager didn't start, and we don't have a
* a fallback. We pop up a error dialog, tell the user
* to start a new window manager, and abort the operation.
*
* (3) The window manager didn't start, and we previously had a
* window manager runnning. We pop up a warning dialog,
* then try to go back to the old window manager.
*
* operation | (1) (2) (3)
* ===========+=================================================
* IDLE |
* TRY | IDLE IDLE TRY
* REVERT | IDLE IDLE REVERT
* OK | (quit) (quit) OK
* CANCEL | (quit) (quit) CANCEL
* TRY_REVERT | REVERT REVERT REVERT
* TRY_CANCEL | CANCEL CANCEL CANCEL
*/
static void
restart_label_update (void)
{
gchar *tmp;
if ((gint)restart_remaining_time != restart_displayed_time) {
restart_displayed_time = restart_remaining_time;
tmp = g_strdup_printf (_("Starting %s\n"
"(%d seconds left before operation times out)"),
restart_name,
restart_displayed_time);
gtk_label_set_text (GTK_LABEL (restart_label), tmp);
g_free (tmp);
}
}
static gboolean
restart_dialog_raise (gpointer data)
{
if (restart_dialog && GTK_WIDGET_REALIZED (restart_dialog)) {
restart_remaining_time -= 0.25;
restart_label_update();
gdk_window_raise (restart_dialog->window);
}
return TRUE;
}
static void
restart_dialog_destroyed (GtkWidget *widget)
{
if (restart_dialog_timeout) {
gtk_timeout_remove (restart_dialog_timeout);
restart_dialog_timeout = 0;
}
restart_dialog = NULL;
}
static void
show_restart_dialog (gchar *name)
{
GtkWidget *hbox;
GtkWidget *frame;
GtkWidget *pixmap;
gchar *tmp;
if (!restart_dialog) {
restart_dialog = gtk_window_new (GTK_WINDOW_POPUP);
gtk_window_set_position (GTK_WINDOW (restart_dialog),
GTK_WIN_POS_CENTER);
gtk_signal_connect (GTK_OBJECT (restart_dialog), "destroy",
GTK_SIGNAL_FUNC (restart_dialog_destroyed),
&restart_dialog);
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_OUT);
gtk_container_add (GTK_CONTAINER (restart_dialog), frame);
hbox = gtk_hbox_new (FALSE, GNOME_PAD);
gtk_container_set_border_width (GTK_CONTAINER (hbox), GNOME_PAD);
gtk_container_add (GTK_CONTAINER (frame), hbox);
tmp = gnome_unconditional_pixmap_file("gnome-info.png");
if (tmp) {
pixmap = gnome_pixmap_new_from_file(tmp);
g_free(tmp);
gtk_box_pack_start (GTK_BOX (hbox), pixmap, FALSE, FALSE, 0);
}
restart_label = gtk_label_new ("");
gtk_box_pack_start (GTK_BOX (hbox), restart_label, FALSE, FALSE, GNOME_PAD);
}
if (!restart_dialog_timeout) {
restart_dialog_timeout = gtk_timeout_add (250, restart_dialog_raise, NULL);
}
restart_remaining_time = 10.0;
restart_displayed_time = -1;
if (restart_name)
g_free (restart_name);
restart_name = g_strdup (name);
restart_label_update ();
gtk_widget_show_all (restart_dialog);
}
static void
hide_restart_dialog (void)
{
if (restart_dialog)
gtk_widget_destroy (restart_dialog);
}
static void
init_session (void)
{
GnomeClientFlags flags;
gint token;
return;
client = gnome_master_client ();
flags = gnome_client_get_flags (client);
if (flags & GNOME_CLIENT_IS_CONNECTED) {
/*token = gnome_startup_acquire_token("GNOME_WM_PROPERTIES",
gnome_client_get_id(client));*/
if (token)
printf ("broken\n");
/*update_session();*/
else {
gnome_client_set_restart_style (client,
GNOME_RESTART_NEVER);
gnome_client_flush (client);
}
}
}
static void
update_session (void)
{
WindowManager *current_wm = wm_list_get_current();
//gchar *session_args[3];
if (!current_wm)
return;
if (current_wm->session_managed) {
gnome_client_set_restart_style (client,
GNOME_RESTART_NEVER);
} else {
g_warning ("We don't properly handle non-session managed Window Managers right now");
}
//else {
// session_args[0] = argv0;
// session_args[1] = "--init-session-settings";
// session_args[2] = NULL;
// /* We use a priority of 15 so that we start after
// * session-managed WM's (priority 10), for safety.
/// */
// gnome_client_set_priority (client, 15);
// gnome_client_set_restart_style (client,
// GNOME_RESTART_ANYWAY);
// gnome_client_set_restart_command (client, 2,
// session_args);
//}
gnome_client_flush (client);
}
static void
init_callback (WMResult result, gpointer data)
{
switch (result) {
case WM_SUCCESS:
break;
case WM_ALREADY_RUNNING:
g_warning (_("wm-properties-capplet: Unable to initialize window manager.\n"
"\tAnother window manager is already running and could not be killed\n"));
break;
case WM_CANT_START:
g_warning (_("wm-properties-capplet: Unable to initialize window manager.\n"
"\t'%s' didn't start\n"), (gchar *)data);
break;
}
g_free (data);
gtk_main_quit ();
}
static void
restart_finalize ()
{
wm_list_set_current (selected_wm);
hide_restart_dialog();
switch (state) {
case STATE_TRY:
case STATE_REVERT:
gtk_widget_set_sensitive (capplet, TRUE);
//update_gui();
state = STATE_IDLE;
break;
case STATE_OK:
case STATE_CANCEL:
if (quit_pending)
gtk_main_quit();
break;
default:
g_warning ("Finalize in state %d!!!\n", state);
return;
}
restart_pending = FALSE;
}
static void
restart_failure (WMResult reason)
{
GtkWidget *msgbox;
WindowManager *current_wm;
gchar *msg = NULL;
gboolean modal = FALSE;
current_wm = wm_list_get_current ();
/* Did the previous window manager not die?
*/
if (reason == WM_ALREADY_RUNNING) {
msg = g_strdup (_("Previous window manager did not die\n"));
switch (state) {
case STATE_TRY:
case STATE_REVERT:
case STATE_OK:
case STATE_CANCEL:
selected_wm = current_wm;
restart_finalize ();
break;
case STATE_TRY_REVERT:
revert_callback ();
break;
case STATE_TRY_CANCEL:
cancel_callback ();
break;
default:
g_warning ("Failure in state %d!!!\n", state);
return;
}
}
/* Is there something reasonable to try to fall back to?
*/
else if (current_wm != selected_wm) {
switch (state) {
case STATE_TRY:
case STATE_REVERT:
case STATE_OK:
case STATE_CANCEL:
msg = g_strdup_printf (_("Could not start '%s'.\n"
"Falling back to previous window manager '%s'\n"),
selected_wm?gnome_desktop_item_get_string (selected_wm->dentry, GNOME_DESKTOP_ITEM_NAME):"Unknown",
current_wm?gnome_desktop_item_get_string (current_wm->dentry, GNOME_DESKTOP_ITEM_NAME):"Unknown");
selected_wm = current_wm;
restart(TRUE);
break;
case STATE_TRY_REVERT:
revert_callback ();
break;
case STATE_TRY_CANCEL:
cancel_callback ();
break;
default:
g_warning ("Failure in state %d!!!\n", state);
return;
}
/* Give up */
} else {
switch (state) {
case STATE_OK:
case STATE_CANCEL:
modal = TRUE; /* prevent an immediate exit */
/* Fall through */
case STATE_TRY:
case STATE_REVERT:
msg = g_strdup (_("Could not start fallback window manager.\n"
"Please run a window manager manually. You can\n"
"do this by selecting \"Run Program\" in the\n"
"foot menu\n"));
restart_finalize();
break;
case STATE_TRY_REVERT:
revert_callback ();
break;
case STATE_TRY_CANCEL:
cancel_callback ();
break;
default:
g_warning ("Failure in state %d!!!\n", state);
return;
}
}
if (msg) {
msgbox = gnome_message_box_new (msg,
GNOME_MESSAGE_BOX_ERROR,
_("OK"), NULL);
if (modal)
gnome_dialog_run (GNOME_DIALOG (msgbox));
else
gtk_widget_show (msgbox);
g_free (msg);
}
}
static void
show_restart_info (void)
{
gchar *save_session;
save_session = gnome_is_program_in_path ("save-session");
if (save_session != NULL) {
system (save_session);
}
g_free (save_session);
}
static void
restart_finish (void)
{
switch (state) {
case STATE_TRY:
case STATE_REVERT:
case STATE_OK:
case STATE_CANCEL:
hide_restart_dialog();
show_restart_info ();
restart_finalize();
break;
case STATE_TRY_REVERT:
revert_callback ();
break;
case STATE_TRY_CANCEL:
cancel_callback ();
break;
default:
g_warning ("Finished in state %d!!!\n", state);
return;
}
}
static void
restart_callback (WMResult result, gpointer data)
{
if (result == WM_SUCCESS)
restart_finish ();
else
restart_failure (result);
}
static void
restart (gboolean force)
{
WindowManager *current_wm = wm_list_get_current(), *mywm;
static gboolean last_try_was_twm = FALSE;
GnomeDesktopItem *twm_dentry = gnome_desktop_item_new ();
WindowManager twm_fallback = {twm_dentry, "twm", "twm", 0, 0, 1, 0};
gnome_desktop_item_set_entry_type (twm_dentry, GNOME_DESKTOP_ITEM_TYPE_APPLICATION);
gnome_desktop_item_set_string (twm_dentry,
GNOME_DESKTOP_ITEM_NAME, "twm");
gnome_desktop_item_set_string (twm_dentry,
GNOME_DESKTOP_ITEM_COMMENT, "twm");
gnome_desktop_item_set_string (twm_dentry,
GNOME_DESKTOP_ITEM_EXEC, "twm");
if(selected_wm) {
last_try_was_twm = FALSE;
mywm = selected_wm;
} else if(!last_try_was_twm) {
last_try_was_twm = TRUE;
mywm = (WindowManager*)&twm_fallback;
} else {
restart_finalize();
gnome_desktop_item_unref (twm_dentry);
return;
}
if (force || current_wm != mywm) {
show_restart_dialog (g_strdup (gnome_desktop_item_get_string (mywm->dentry, GNOME_DESKTOP_ITEM_NAME)));
if (state != STATE_OK && state != STATE_CANCEL)
gtk_widget_set_sensitive (capplet, FALSE);
restart_pending = TRUE;
wm_restart (mywm,
capplet->window,
restart_callback,
NULL);
} else {
restart_finalize ();
}
gnome_desktop_item_unref (twm_dentry);
}
static void
revert_callback (void)
{
StateType old_state = state;
switch (state) {
case STATE_IDLE:
case STATE_TRY_REVERT:
wm_list_revert();
selected_wm = wm_list_get_revert();
state = STATE_REVERT;
restart (old_state == STATE_TRY_REVERT);
/*update_gui();*/
break;
case STATE_TRY:
state = STATE_TRY_REVERT;
break;
default:
g_warning ("revert callback in state %d!!!\n", state);
return;
}
}
static void
cancel_callback (void)
{
StateType old_state = state;
switch (state) {
case STATE_IDLE:
case STATE_TRY_CANCEL:
wm_list_revert();
selected_wm = wm_list_get_revert();
state = STATE_CANCEL;
restart (old_state == STATE_TRY_CANCEL);
break;
case STATE_TRY:
state = STATE_TRY_CANCEL;
break;
case STATE_REVERT:
state = STATE_CANCEL;
break;
case STATE_TRY_REVERT:
state = STATE_TRY_CANCEL;
break;
default:
g_warning ("ok callback in state %d!!!\n", state);
return;
}
}
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