[~andy/gtk] / gtk / gtkmain.c

/* GTK - The GIMP Toolkit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

#include "gdkconfig.h"

#include <locale.h>

#ifdef HAVE_BIND_TEXTDOMAIN_CODESET
#include <libintl.h>
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gmodule.h>
#ifdef G_OS_UNIX
#include <unistd.h>
#include <sys/types.h>          /* For uid_t, gid_t */
#endif
#ifdef G_OS_WIN32
#define STRICT
#include <windows.h>
#undef STRICT
#endif

#include <pango/pango-utils.h>  /* For pango_split_file_list */

#include "gtkaccelmap.h"
#include "gtkbox.h"
#include "gtkdnd.h"
#include "gtkversion.h"
#include "gtkmain.h"
#include "gtkrc.h"
#include "gtkselection.h"
#include "gtksettings.h"
#include "gtksignal.h"
#include "gtkwidget.h"
#include "gtkwindow.h"
#include "gtkprivate.h"
#include "config.h"
#include "gtkdebug.h"
#include "gtkintl.h"

/* Private type definitions
 */
typedef struct _GtkInitFunction          GtkInitFunction;
typedef struct _GtkQuitFunction          GtkQuitFunction;
typedef struct _GtkClosure               GtkClosure;
typedef struct _GtkKeySnooperData        GtkKeySnooperData;
typedef struct _GtkModuleInfo            GtkModuleInfo;

struct _GtkInitFunction
{
  GtkFunction function;
  gpointer data;
};

struct _GtkQuitFunction
{
  guint id;
  guint main_level;
  GtkCallbackMarshal marshal;
  GtkFunction function;
  gpointer data;
  GtkDestroyNotify destroy;
};

struct _GtkClosure
{
  GtkCallbackMarshal marshal;
  gpointer data;
  GtkDestroyNotify destroy;
};

struct _GtkKeySnooperData
{
  GtkKeySnoopFunc func;
  gpointer func_data;
  guint id;
};

struct _GtkModuleInfo
{
  GtkModuleInitFunc init_func;
  GtkModuleDisplayInitFunc display_init_func;
};

static gint  gtk_quit_invoke_function    (GtkQuitFunction    *quitf);
static void  gtk_quit_destroy            (GtkQuitFunction    *quitf);
static gint  gtk_invoke_key_snoopers     (GtkWidget          *grab_widget,
                                          GdkEvent           *event);

static void     gtk_destroy_closure      (gpointer            data);
static gboolean gtk_invoke_idle_timeout  (gpointer            data);
static void     gtk_invoke_input         (gpointer            data,
                                          gint                source,
                                          GdkInputCondition   condition);

#if 0
static void  gtk_error                   (gchar              *str);
static void  gtk_warning                 (gchar              *str);
static void  gtk_message                 (gchar              *str);
static void  gtk_print                   (gchar              *str);
#endif

static GtkWindowGroup *gtk_main_get_window_group (GtkWidget   *widget);

const guint gtk_major_version = GTK_MAJOR_VERSION;
const guint gtk_minor_version = GTK_MINOR_VERSION;
const guint gtk_micro_version = GTK_MICRO_VERSION;
const guint gtk_binary_age = GTK_BINARY_AGE;
const guint gtk_interface_age = GTK_INTERFACE_AGE;

static GSList *gtk_modules;

/* Saved argc,argv for delayed module initialization
 */
static gint    gtk_argc = 0;
static gchar **gtk_argv = NULL;

static guint gtk_main_loop_level = 0;
static gint gtk_initialized = FALSE;
static GList *current_events = NULL;

static GSList *main_loops = NULL;      /* stack of currently executing main loops */

static GList *init_functions = NULL;       /* A list of init functions.
                                            */
static GList *quit_functions = NULL;       /* A list of quit functions.
                                            */
static GMemChunk *quit_mem_chunk = NULL;

static GSList *key_snoopers = NULL;

guint gtk_debug_flags = 0;                 /* Global GTK debug flag */

#ifdef G_ENABLE_DEBUG
static const GDebugKey gtk_debug_keys[] = {
  {"misc", GTK_DEBUG_MISC},
  {"plugsocket", GTK_DEBUG_PLUGSOCKET},
  {"text", GTK_DEBUG_TEXT},
  {"tree", GTK_DEBUG_TREE},
  {"updates", GTK_DEBUG_UPDATES},
  {"keybindings", GTK_DEBUG_KEYBINDINGS},
  {"multihead", GTK_DEBUG_MULTIHEAD}
};

static const guint gtk_ndebug_keys = sizeof (gtk_debug_keys) / sizeof (GDebugKey);

#endif /* G_ENABLE_DEBUG */

gchar*
gtk_check_version (guint required_major,
                   guint required_minor,
                   guint required_micro)
{
  gint gtk_effective_micro = 100 * GTK_MINOR_VERSION + GTK_MICRO_VERSION;
  gint required_effective_micro = 100 * required_minor + required_micro;

  if (required_major > GTK_MAJOR_VERSION)
    return "Gtk+ version too old (major mismatch)";
  if (required_major < GTK_MAJOR_VERSION)
    return "Gtk+ version too new (major mismatch)";
  if (required_effective_micro < gtk_effective_micro - GTK_BINARY_AGE)
    return "Gtk+ version too new (micro mismatch)";
  if (required_effective_micro > gtk_effective_micro)
    return "Gtk+ version too old (micro mismatch)";
  return NULL;
}

/* This checks to see if the process is running suid or sgid
 * at the current time. If so, we don't allow GTK+ to be initialized.
 * This is meant to be a mild check - we only error out if we
 * can prove the programmer is doing something wrong, not if
 * they could be doing something wrong. For this reason, we
 * don't use issetugid() on BSD or prctl (PR_GET_DUMPABLE).
 */
static gboolean
check_setugid (void)
{
/* this isn't at all relevant on MS Windows and doesn't compile ... --hb */
#ifndef G_OS_WIN32
  uid_t ruid, euid, suid; /* Real, effective and saved user ID's */
  gid_t rgid, egid, sgid; /* Real, effective and saved group ID's */
  
#ifdef HAVE_GETRESUID
  /* These aren't in the header files, so we prototype them here.
   */
  int getresuid(uid_t *ruid, uid_t *euid, uid_t *suid);
  int getresgid(gid_t *rgid, gid_t *egid, gid_t *sgid);

  if (getresuid (&ruid, &euid, &suid) != 0 ||
      getresgid (&rgid, &egid, &sgid) != 0)
#endif /* HAVE_GETRESUID */
    {
      suid = ruid = getuid ();
      sgid = rgid = getgid ();
      euid = geteuid ();
      egid = getegid ();
    }

  if (ruid != euid || ruid != suid ||
      rgid != egid || rgid != sgid)
    {
      g_warning ("This process is currently running setuid or setgid.\n"
                 "This is not a supported use of GTK+. You must create a helper\n"
                 "program instead. For further details, see:\n\n"
                 "    http://www.gtk.org/setuid.html\n\n"
                 "Refusing to initialize GTK+.");
      exit (1);
    }
#endif
  return TRUE;
}

#ifdef G_OS_WIN32

G_WIN32_DLLMAIN_FOR_DLL_NAME(static, dll_name)

const gchar *
_gtk_get_libdir (void)
{
  static char *gtk_libdir = NULL;
  if (gtk_libdir == NULL)
    gtk_libdir = g_win32_get_package_installation_subdirectory
      (GETTEXT_PACKAGE, dll_name, "lib");

  return gtk_libdir;
}

const gchar *
_gtk_get_localedir (void)
{
  static char *gtk_localedir = NULL;
  if (gtk_localedir == NULL)
    gtk_localedir = g_win32_get_package_installation_subdirectory
      (GETTEXT_PACKAGE, dll_name, "lib\\locale");

  return gtk_localedir;
}

const gchar *
_gtk_get_sysconfdir (void)
{
  static char *gtk_sysconfdir = NULL;
  if (gtk_sysconfdir == NULL)
    gtk_sysconfdir = g_win32_get_package_installation_subdirectory
      (GETTEXT_PACKAGE, dll_name, "etc");

  return gtk_sysconfdir;
}

const gchar *
_gtk_get_data_prefix (void)
{
  static char *gtk_data_prefix = NULL;
  if (gtk_data_prefix == NULL)
    gtk_data_prefix = g_win32_get_package_installation_directory
      (GETTEXT_PACKAGE, dll_name);

  return gtk_data_prefix;
}

#endif /* G_OS_WIN32 */

static gchar **
get_module_path (void)
{
  const gchar *module_path_env;
  const gchar *exe_prefix;
  const gchar *home_dir;
  gchar *home_gtk_dir = NULL;
  gchar *module_path;
  gchar *default_dir;
  static gchar **result = NULL;

  if (result)
    return result;

  home_dir = g_get_home_dir();
  if (home_dir)
    home_gtk_dir = g_build_filename (home_dir, ".gtk-2.0", NULL);

  module_path_env = g_getenv ("GTK_PATH");
  exe_prefix = g_getenv ("GTK_EXE_PREFIX");

  if (exe_prefix)
    default_dir = g_build_filename (exe_prefix, "lib", "gtk-2.0", NULL);
  else
    default_dir = g_build_filename (GTK_LIBDIR, "gtk-2.0", NULL);

  if (module_path_env && home_gtk_dir)
    module_path = g_build_path (G_SEARCHPATH_SEPARATOR_S,
                                module_path_env, home_gtk_dir, default_dir, NULL);
  else if (module_path_env)
    module_path = g_build_path (G_SEARCHPATH_SEPARATOR_S,
                                module_path_env, default_dir, NULL);
  else if (home_gtk_dir)
    module_path = g_build_path (G_SEARCHPATH_SEPARATOR_S,
                                home_gtk_dir, default_dir, NULL);
  else
    module_path = g_build_path (G_SEARCHPATH_SEPARATOR_S,
                                default_dir, NULL);

  g_free (home_gtk_dir);
  g_free (default_dir);

  result = pango_split_file_list (module_path);
  g_free (module_path);

  return result;
}

/**
 * _gtk_get_module_path:
 * @type: the type of the module, for instance 'modules', 'engines', immodules'
 * 
 * Determines the search path for a particular type of module.
 * 
 * Return value: the search path for the module type. Free with g_strfreev().
 **/
gchar **
_gtk_get_module_path (const gchar *type)
{
  gchar **paths = get_module_path();
  gchar **path;
  gchar **result;
  gint count = 0;

  for (path = paths; *path; path++)
    count++;

  result = g_new (gchar *, count * 4 + 1);

  count = 0;
  for (path = get_module_path (); *path; path++)
    {
      gint use_version, use_host;
      
      for (use_version = TRUE; use_version >= FALSE; use_version--)
        for (use_host = TRUE; use_host >= FALSE; use_host--)
          {
            gchar *tmp_dir;
            
            if (use_version && use_host)
              tmp_dir = g_build_filename (*path, GTK_BINARY_VERSION, GTK_HOST, type, NULL);
            else if (use_version)
              tmp_dir = g_build_filename (*path, GTK_BINARY_VERSION, type, NULL);
            else if (use_host)
              tmp_dir = g_build_filename (*path, GTK_HOST, type, NULL);
            else
              tmp_dir = g_build_filename (*path, type, NULL);

            result[count++] = tmp_dir;
          }
    }

  result[count++] = NULL;

  return result;
}

/* Like g_module_path, but use .la as the suffix
 */
static gchar*
module_build_la_path (const gchar *directory,
                      const gchar *module_name)
{
        gchar *filename;
        gchar *result;
        
        if (strncmp (module_name, "lib", 3) == 0)
                filename = (gchar *)module_name;
        else
                filename =  g_strconcat ("lib", module_name, ".la", NULL);

        if (directory && *directory)
                result = g_build_filename (directory, filename, NULL);
        else
                result = g_strdup (filename);

        if (filename != module_name)
                g_free (filename);

        return result;
}

/**
 * _gtk_find_module:
 * @name: the name of the module
 * @type: the type of the module, for instance 'modules', 'engines', immodules'
 * 
 * Looks for a dynamically module named @name of type @type in the standard GTK+
 *  module search path.
 * 
 * Return value: the pathname to the found module, or %NULL if it wasn't found.
 *  Free with g_free().
 **/
gchar *
_gtk_find_module (const gchar *name,
                  const gchar *type)
{
  gchar **paths;
  gchar **path;
  gchar *module_name = NULL;

  if (g_path_is_absolute (name))
    return g_strdup (name);

  paths = _gtk_get_module_path (type);
  for (path = paths; *path; path++)
    {
      gchar *tmp_name;

      tmp_name = g_module_build_path (*path, name);
      if (g_file_test (tmp_name, G_FILE_TEST_EXISTS))
        {
          module_name = tmp_name;
          goto found;
        }
      g_free(tmp_name);

      tmp_name = module_build_la_path (*path, name);
      if (g_file_test (tmp_name, G_FILE_TEST_EXISTS))
        {
          module_name = tmp_name;
          goto found;
        }
      g_free(tmp_name);
    }

 found:
  g_strfreev (paths);
  return module_name;
}

static GModule *
find_module (const gchar *name)
{
  GModule *module;
  gchar *module_name;

  module_name = _gtk_find_module (name, "modules");
  if (!module_name)
    {
      /* As last resort, try loading without an absolute path (using system
       * library path)
       */
      module_name = g_module_build_path (NULL, name);
    }
  
  module = g_module_open (module_name, G_MODULE_BIND_LAZY);
  g_free(module_name);

  return module;
}

static GSList *
load_module (GSList      *module_list,
             const gchar *name)
{
  GtkModuleInitFunc modinit_func = NULL;
  GtkModuleInfo *info;
  GModule *module = NULL;
  
  if (g_module_supported ())
    {
      module = find_module (name);
      if (module &&
          g_module_symbol (module, "gtk_module_init", (gpointer *) &modinit_func) &&
          modinit_func)
        {
          if (!g_slist_find (module_list, (gconstpointer) modinit_func))
            {
              g_module_make_resident (module);
              info = g_new (GtkModuleInfo, 1);

              info->init_func = modinit_func;
              g_module_symbol (module, "gtk_module_display_init",
                               (gpointer *) &info->display_init_func);
              
              module_list = g_slist_prepend (module_list, info);
            }
          else
            {
              g_module_close (module);
              module = NULL;
            }
        }
    }
  if (!modinit_func)
    {
      g_message ("Failed to load module \"%s\": %s",
                 module ? g_module_name (module) : name,
                 g_module_error ());
      if (module)
        g_module_close (module);
    }
  
  return module_list;
}

static GSList *
load_modules (const char *module_str)
{
  gchar **module_names = pango_split_file_list (module_str);
  GSList *module_list = NULL;
  gint i;
  
  for (i = 0; module_names[i]; i++)
    module_list = load_module (module_list, module_names[i]);
  
  module_list = g_slist_reverse (module_list);
  
  g_strfreev (module_names);

  return module_list;
}

static gboolean do_setlocale = TRUE;

/**
 * gtk_disable_setlocale:
 * 
 * Prevents gtk_init() and gtk_init_check() from automatically
 * calling <literal>setlocale (LC_ALL, "")</literal>. You would 
 * want to use this function if you wanted to set the locale for 
 * your program to something other than the user's locale, or if 
 * you wanted to set different values for different locale categories.
 *
 * Most programs should not need to call this function.
 **/
void
gtk_disable_setlocale (void)
{
  if (gtk_initialized)
    g_warning ("gtk_disable_setlocale() must be called before gtk_init()");
    
  do_setlocale = FALSE;
}

#undef gtk_init_check

static void
default_display_notify_cb (GdkDisplayManager *display_manager)
{
  GSList *slist;

  /* Initialize non-multihead-aware modules when the
   * default display is first set to a non-NULL value.
   */
  static gboolean initialized = FALSE;

  if (!gdk_display_get_default () || initialized)
    return;

  initialized = TRUE;

  for (slist = gtk_modules; slist; slist = slist->next)
    {
      if (slist->data)
        {
          GtkModuleInfo *info = slist->data;

          if (!info->display_init_func)
            info->init_func (&gtk_argc, &gtk_argv);
        }
    }
}

static void
display_opened_cb (GdkDisplayManager *display_manager,
                   GdkDisplay        *display)
{
  GSList *slist;
  
  for (slist = gtk_modules; slist; slist = slist->next)
    {
      if (slist->data)
        {
          GtkModuleInfo *info = slist->data;

          if (info->display_init_func)
            info->display_init_func (display);
        }
    }
}

/**
 * gdk_parse_args:
 * @argc: the number of command line arguments.
 * @argv: the array of command line arguments.
 * 
 * Parses command line arguments, and initializes global
 * attributes of GTK+, but does not actually open a connection
 * to a display. (See gdk_display_open(), gdk_get_display_arg_name())
 *
 * Any arguments used by GTK or GDK are removed from the array and
 * @argc and @argv are updated accordingly.
 *
 * You shouldn't call this function explicitely if you are using
 * gtk_init(), or gtk_init_check().
 *
 * Return value: %TRUE if initialization succeeded, otherwise %FALSE.
 **/
gboolean
gtk_parse_args (int    *argc,
                char ***argv)
{
  GString *gtk_modules_string = NULL;
  GSList *slist;
  GdkDisplayManager *display_manager;
  const gchar *env_string;

  if (gtk_initialized)
    return TRUE;

  if (!check_setugid ())
    return FALSE;
  
#if     0
  g_set_error_handler (gtk_error);
  g_set_warning_handler (gtk_warning);
  g_set_message_handler (gtk_message);
  g_set_print_handler (gtk_print);
#endif

  if (do_setlocale)
    {
      if (!setlocale (LC_ALL, ""))
        g_warning ("Locale not supported by C library.\n\tUsing the fallback 'C' locale.");
    }

  gdk_parse_args (argc, argv);
  gdk_event_handler_set ((GdkEventFunc)gtk_main_do_event, NULL, NULL);
  
#ifdef G_ENABLE_DEBUG
  env_string = g_getenv ("GTK_DEBUG");
  if (env_string != NULL)
    {
      gtk_debug_flags = g_parse_debug_string (env_string,
                                              gtk_debug_keys,
                                              gtk_ndebug_keys);
      env_string = NULL;
    }
#endif  /* G_ENABLE_DEBUG */

  env_string = g_getenv ("GTK_MODULES");
  if (env_string)
    gtk_modules_string = g_string_new (env_string);

  if (argc && argv)
    {
      gint i, j, k;
      
      for (i = 1; i < *argc;)
        {
          if (strcmp ("--gtk-module", (*argv)[i]) == 0 ||
              strncmp ("--gtk-module=", (*argv)[i], 13) == 0)
            {
              gchar *module_name = (*argv)[i] + 12;
              
              if (*module_name == '=')
                module_name++;
              else if (i + 1 < *argc)
                {
                  (*argv)[i] = NULL;
                  i += 1;
                  module_name = (*argv)[i];
                }
              (*argv)[i] = NULL;

              if (module_name && *module_name)
                {
                  if (gtk_modules_string)
                    g_string_append_c (gtk_modules_string, G_SEARCHPATH_SEPARATOR);
                  else
                    gtk_modules_string = g_string_new (NULL);

                  g_string_append (gtk_modules_string, module_name);
                }
            }
          else if (strcmp ("--g-fatal-warnings", (*argv)[i]) == 0)
            {
              GLogLevelFlags fatal_mask;
              
              fatal_mask = g_log_set_always_fatal (G_LOG_FATAL_MASK);
              fatal_mask |= G_LOG_LEVEL_WARNING | G_LOG_LEVEL_CRITICAL;
              g_log_set_always_fatal (fatal_mask);
              (*argv)[i] = NULL;
            }
#ifdef G_ENABLE_DEBUG
          else if ((strcmp ("--gtk-debug", (*argv)[i]) == 0) ||
                   (strncmp ("--gtk-debug=", (*argv)[i], 12) == 0))
            {
              gchar *equal_pos = strchr ((*argv)[i], '=');
              
              if (equal_pos != NULL)
                {
                  gtk_debug_flags |= g_parse_debug_string (equal_pos+1,
                                                           gtk_debug_keys,
                                                           gtk_ndebug_keys);
                }
              else if ((i + 1) < *argc && (*argv)[i + 1])
                {
                  gtk_debug_flags |= g_parse_debug_string ((*argv)[i+1],
                                                           gtk_debug_keys,
                                                           gtk_ndebug_keys);
                  (*argv)[i] = NULL;
                  i += 1;
                }
              (*argv)[i] = NULL;
            }
          else if ((strcmp ("--gtk-no-debug", (*argv)[i]) == 0) ||
                   (strncmp ("--gtk-no-debug=", (*argv)[i], 15) == 0))
            {
              gchar *equal_pos = strchr ((*argv)[i], '=');
              
              if (equal_pos != NULL)
                {
                  gtk_debug_flags &= ~g_parse_debug_string (equal_pos+1,
                                                            gtk_debug_keys,
                                                            gtk_ndebug_keys);
                }
              else if ((i + 1) < *argc && (*argv)[i + 1])
                {
                  gtk_debug_flags &= ~g_parse_debug_string ((*argv)[i+1],
                                                            gtk_debug_keys,
                                                            gtk_ndebug_keys);
                  (*argv)[i] = NULL;
                  i += 1;
                }
              (*argv)[i] = NULL;
            }
#endif /* G_ENABLE_DEBUG */
          i += 1;
        }
      
      for (i = 1; i < *argc; i++)
        {
          for (k = i; k < *argc; k++)
            if ((*argv)[k] != NULL)
              break;
          
          if (k > i)
            {
              k -= i;
              for (j = i + k; j < *argc; j++)
                (*argv)[j-k] = (*argv)[j];
              *argc -= k;
            }
        }

      gtk_argv = g_malloc ((gtk_argc + 1) * sizeof (char*));
      for (i = 0; i < gtk_argc; i++)
        gtk_argv[i] = g_strdup ((*argv)[i]);
      gtk_argv[gtk_argc] = NULL;
    }

  if (gtk_debug_flags & GTK_DEBUG_UPDATES)
    gdk_window_set_debug_updates (TRUE);

  /* load gtk modules */
  if (gtk_modules_string)
    {
      gtk_modules = load_modules (gtk_modules_string->str);
      g_string_free (gtk_modules_string, TRUE);
    }

#ifdef ENABLE_NLS
  bindtextdomain (GETTEXT_PACKAGE, GTK_LOCALEDIR);
#    ifdef HAVE_BIND_TEXTDOMAIN_CODESET
  bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
#    endif
#endif  

  {
  /* Translate to default:RTL if you want your widgets
   * to be RTL, otherwise translate to default:LTR.
   * Do *not* translate it to "predefinito:LTR", if it
   * it isn't default:LTR or default:RTL it will not work 
   */
    char *e = _("default:LTR");
    if (strcmp (e, "default:RTL")==0) {
      gtk_widget_set_default_direction (GTK_TEXT_DIR_RTL);
    } else if (strcmp (e, "default:LTR")) {
      g_warning ("Whoever translated default:LTR did so wrongly.\n");
    }
  }

  gtk_type_init (0);
  _gtk_accel_map_init ();  
  _gtk_rc_init ();
  
  /* Set the 'initialized' flag.
   */
  gtk_initialized = TRUE;

  display_manager = gdk_display_manager_get ();
  g_signal_connect (display_manager, "notify::default-display",
                    G_CALLBACK (default_display_notify_cb), NULL);
  g_signal_connect (display_manager, "display-opened",
                    G_CALLBACK (display_opened_cb), NULL);

  /* initialize multhead aware gtk modules; for other modules,
   * we wait until we have a display open;
   */
  for (slist = gtk_modules; slist; slist = slist->next)
    {
      if (slist->data)
        {
          GtkModuleInfo *info = slist->data;

          if (info->display_init_func)
            info->init_func (argc, argv);
        }
    }
  
  return TRUE;
}

#undef gtk_init_check

/**
 * gtk_init_check:
 * @argc: Address of the <parameter>argc</parameter> parameter of your 
 *   <function>main()</function> function. Changed if any arguments were 
 *   handled.
 * @argv: Address of the <parameter>argv</parameter> parameter of 
 *   <function>main()</function>. Any parameters understood by gtk_init() 
 *   are stripped before return.
 * 
 * This function does the same work as gtk_init() with only 
 * a single change: It does not terminate the program if the GUI can't be 
 * initialized. Instead it returns %FALSE on failure.
 *
 * This way the application can fall back to some other means of communication 
 * with the user - for example a curses or command line interface.
 * 
 * Return value: %TRUE if the GUI has been successfully initialized, 
 *               %FALSE otherwise.
 **/
gboolean
gtk_init_check (int      *argc,
                char   ***argv)
{
  GdkDisplay *display;
  
  if (!gtk_parse_args (argc, argv))
    return FALSE;

  if (gdk_display_get_default ())
    return TRUE;

  display = gdk_display_open (gdk_get_display_arg_name ());

  if (display)
    {
      gdk_display_manager_set_default_display (gdk_display_manager_get (),
                                               display);
      return TRUE;
    }
  else
    return FALSE;
}

#undef gtk_init

/**
 * gtk_init:
 * @argc: Address of the <parameter>argc</parameter> parameter of your 
 *   <function>main()</function> function. Changed if any arguments were 
 *   handled.
 * @argv: Address of the <parameter>argv</parameter> parameter of 
 *   <function>main()</function>. Any parameters understood by gtk_init() 
 *   are stripped before return.
 * 
 * Call this function before using any other GTK+ functions in your GUI
 * applications.  It will initialize everything needed to operate the toolkit and
 * parses some standard command line options. @argc and 
 * @argv are adjusted accordingly so your own code will 
 * never see those standard arguments.
 *
 * <note><para>
 * This function will terminate your program if it was unable to initialize 
 * the GUI for some reason. If you want your program to fall back to a 
 * textual interface you want to call gtk_init_check() instead.
 * </para></note>
 **/
void
gtk_init (int *argc, char ***argv)
{
  if (!gtk_init_check (argc, argv))
    {
      char *display_name_arg = gdk_get_display_arg_name ();
      g_warning ("cannot open display: %s", display_name_arg ? display_name_arg : " ");
      exit (1);
    }
}

#ifdef G_OS_WIN32

static void
check_sizeof_GtkWindow (size_t sizeof_GtkWindow)
{
  if (sizeof_GtkWindow != sizeof (GtkWindow))
    g_error ("Incompatible build!\n"
             "The code using GTK+ thinks GtkWindow is of different\n"
             "size than it actually is in this build of GTK+.\n"
             "On Windows, this probably means that you have compiled\n"
             "your code with gcc without the -fnative-struct switch,\n"
             "or that you are using an unsupported compiler.");
}

/* In GTK+ 2.0 the GtkWindow struct actually is the same size in
 * gcc-compiled code on Win32 whether compiled with -fnative-struct or
 * not. Unfortunately this wan't noticed until after GTK+ 2.0.1. So,
 * from GTK+ 2.0.2 on, check some other struct, too, where the use of
 * -fnative-struct still matters. GtkBox is one such.
 */
static void
check_sizeof_GtkBox (size_t sizeof_GtkBox)
{
  if (sizeof_GtkBox != sizeof (GtkBox))
    g_error ("Incompatible build!\n"
             "The code using GTK+ thinks GtkBox is of different\n"
             "size than it actually is in this build of GTK+.\n"
             "On Windows, this probably means that you have compiled\n"
             "your code with gcc without the -fnative-struct switch,\n"
             "or that you are using an unsupported compiler.");
}

/* These two functions might get more checks added later, thus pass
 * in the number of extra args.
 */
void
gtk_init_abi_check (int *argc, char ***argv, int num_checks, size_t sizeof_GtkWindow, size_t sizeof_GtkBox)
{
  check_sizeof_GtkWindow (sizeof_GtkWindow);
  if (num_checks >= 2)
    check_sizeof_GtkBox (sizeof_GtkBox);
  gtk_init (argc, argv);
}

gboolean
gtk_init_check_abi_check (int *argc, char ***argv, int num_checks, size_t sizeof_GtkWindow, size_t sizeof_GtkBox)
{
  check_sizeof_GtkWindow (sizeof_GtkWindow);
  if (num_checks >= 2)
    check_sizeof_GtkBox (sizeof_GtkBox);
  return gtk_init_check (argc, argv);
}

#endif

void
gtk_exit (gint errorcode)
{
  /* Only if "gtk" has been initialized should we de-initialize.
   */
  gdk_exit (errorcode);
}


/**
 * gtk_set_locale:
 *
 * Initializes internationalization support for GTK+. gtk_init()
 * automatically does this, so there is typically no point
 * in calling this function.
 *
 * If you are calling this function because you changed the locale
 * after GTK+ is was initialized, then calling this function
 * may help a bit. (Note, however, that changing the locale
 * after GTK+ is initialized may produce inconsistent results and
 * is not really supported.)
 * 
 * In detail - sets the current locale according to the
 * program environment. This is the same as calling the C library function
 * <literal>setlocale (LC_ALL, "")</literal> but also takes care of the 
 * locale specific setup of the windowing system used by GDK.
 * 
 * Return value: a string corresponding to the locale set, as with the
 * C library function <function>setlocale()</function>.
 **/
gchar*
gtk_set_locale (void)
{
  return gdk_set_locale ();
}

/**
 * gtk_get_default_language:
 *
 * Returns the ISO language code for the default language currently in
 * effect. (Note that this can change over the life of an
 * application.)  The default language is derived from the current
 * locale. It determines, for example, whether GTK+ uses the
 * right-to-left or left-to-right text direction.
 * 
 * Return value: the default language as an allocated string, must be freed
 **/
PangoLanguage *
gtk_get_default_language (void)
{
  gchar *lang;
  PangoLanguage *result;
  gchar *p;
  
  lang = g_strdup (setlocale (LC_CTYPE, NULL));
  p = strchr (lang, '.');
  if (p)
    *p = '\0';
  p = strchr (lang, '@');
  if (p)
    *p = '\0';

  result = pango_language_from_string (lang);
  g_free (lang);
  
  return result;
}

void
gtk_main (void)
{
  GList *tmp_list;
  GList *functions;
  GtkInitFunction *init;
  GMainLoop *loop;

  gtk_main_loop_level++;
  
  loop = g_main_new (TRUE);
  main_loops = g_slist_prepend (main_loops, loop);

  tmp_list = functions = init_functions;
  init_functions = NULL;
  
  while (tmp_list)
    {
      init = tmp_list->data;
      tmp_list = tmp_list->next;
      
      (* init->function) (init->data);
      g_free (init);
    }
  g_list_free (functions);

  if (g_main_is_running (main_loops->data))
    {
      GDK_THREADS_LEAVE ();
      g_main_run (loop);
      GDK_THREADS_ENTER ();
      gdk_flush ();
    }

  if (quit_functions)
    {
      GList *reinvoke_list = NULL;
      GtkQuitFunction *quitf;

      while (quit_functions)
        {
          quitf = quit_functions->data;

          tmp_list = quit_functions;
          quit_functions = g_list_remove_link (quit_functions, quit_functions);
          g_list_free_1 (tmp_list);

          if ((quitf->main_level && quitf->main_level != gtk_main_loop_level) ||
              gtk_quit_invoke_function (quitf))
            {
              reinvoke_list = g_list_prepend (reinvoke_list, quitf);
            }
          else
            {
              gtk_quit_destroy (quitf);
            }
        }
      if (reinvoke_list)
        {
          GList *work;
          
          work = g_list_last (reinvoke_list);
          if (quit_functions)
            quit_functions->prev = work;
          work->next = quit_functions;
          quit_functions = work;
        }

      gdk_flush ();
    }
              
  main_loops = g_slist_remove (main_loops, loop);

  g_main_destroy (loop);

  gtk_main_loop_level--;
}

guint
gtk_main_level (void)
{
  return gtk_main_loop_level;
}

void
gtk_main_quit (void)
{
  g_return_if_fail (main_loops != NULL);

  g_main_quit (main_loops->data);
}

gint
gtk_events_pending (void)
{
  gboolean result;
  
  GDK_THREADS_LEAVE ();  
  result = g_main_pending ();
  GDK_THREADS_ENTER ();

  return result;
}

gboolean
gtk_main_iteration (void)
{
  GDK_THREADS_LEAVE ();
  g_main_iteration (TRUE);
  GDK_THREADS_ENTER ();

  if (main_loops)
    return !g_main_is_running (main_loops->data);
  else
    return TRUE;
}

gboolean
gtk_main_iteration_do (gboolean blocking)
{
  GDK_THREADS_LEAVE ();
  g_main_iteration (blocking);
  GDK_THREADS_ENTER ();

  if (main_loops)
    return !g_main_is_running (main_loops->data);
  else
    return TRUE;
}

/* private libgtk to libgdk interfaces
 */
gboolean gdk_pointer_grab_info_libgtk_only  (GdkDisplay *display,
                                             GdkWindow **grab_window,
                                             gboolean   *owner_events);
gboolean gdk_keyboard_grab_info_libgtk_only (GdkDisplay *display,
                                             GdkWindow **grab_window,
                                             gboolean   *owner_events);

static void
rewrite_events_translate (GdkWindow *old_window,
                          GdkWindow *new_window,
                          gdouble   *x,
                          gdouble   *y)
{
  gint old_origin_x, old_origin_y;
  gint new_origin_x, new_origin_y;

  gdk_window_get_origin (old_window, &old_origin_x, &old_origin_y);
  gdk_window_get_origin (new_window, &new_origin_x, &new_origin_y);

  *x += old_origin_x - new_origin_x;
  *y += old_origin_y - new_origin_y;
}

static GdkEvent *
rewrite_event_for_window (GdkEvent  *event,
                          GdkWindow *new_window)
{
  event = gdk_event_copy (event);

  switch (event->type)
    {
    case GDK_SCROLL:
      rewrite_events_translate (event->any.window,
                                new_window,
                                &event->scroll.x, &event->scroll.y);
      break;
    case GDK_BUTTON_PRESS:
    case GDK_2BUTTON_PRESS:
    case GDK_3BUTTON_PRESS:
    case GDK_BUTTON_RELEASE:
      rewrite_events_translate (event->any.window,
                                new_window,
                                &event->button.x, &event->button.y);
      break;
    case GDK_MOTION_NOTIFY:
      rewrite_events_translate (event->any.window,
                                new_window,
                                &event->motion.x, &event->motion.y);
      break;
    case GDK_KEY_PRESS:
    case GDK_KEY_RELEASE:
    case GDK_PROXIMITY_IN:
    case GDK_PROXIMITY_OUT:
      break;

    default:
      return event;
    }

  g_object_unref (event->any.window);
  event->any.window = g_object_ref (new_window);

  return event;
}

/* If there is a pointer or keyboard grab in effect with owner_events = TRUE,
 * then what X11 does is deliver the event normally if it was going to this
 * client, otherwise, delivers it in terms of the grab window. This function
 * rewrites events to the effect that events going to the same window group
 * are delivered normally, otherwise, the event is delivered in terms of the
 * grab window.
 */
static GdkEvent *
rewrite_event_for_grabs (GdkEvent *event)
{
  GdkWindow *grab_window;
  GtkWidget *event_widget, *grab_widget;
  gboolean owner_events;
  GdkDisplay *display;

  switch (event->type)
    {
    case GDK_SCROLL:
    case GDK_BUTTON_PRESS:
    case GDK_2BUTTON_PRESS:
    case GDK_3BUTTON_PRESS:
    case GDK_BUTTON_RELEASE:
    case GDK_MOTION_NOTIFY:
    case GDK_PROXIMITY_IN:
    case GDK_PROXIMITY_OUT:
      display = gdk_drawable_get_display (event->proximity.window);
      if (!gdk_pointer_grab_info_libgtk_only (display, &grab_window, &owner_events) ||
          !owner_events)
        return NULL;
      break;

    case GDK_KEY_PRESS:
    case GDK_KEY_RELEASE:
      display = gdk_drawable_get_display (event->key.window);
      if (!gdk_keyboard_grab_info_libgtk_only (display, &grab_window, &owner_events) ||
          !owner_events)
        return NULL;
      break;

    default:
      return NULL;
    }

  event_widget = gtk_get_event_widget (event);
  gdk_window_get_user_data (grab_window, (void**) &grab_widget);

  if (grab_widget &&
      gtk_main_get_window_group (grab_widget) != gtk_main_get_window_group (event_widget))
    return rewrite_event_for_window (event, grab_window);
  else
    return NULL;
}

void 
gtk_main_do_event (GdkEvent *event)
{
  GtkWidget *event_widget;
  GtkWidget *grab_widget;
  GtkWindowGroup *window_group;
  GdkEvent *next_event;
  GdkEvent *rewritten_event = NULL;
  GList *tmp_list;

  /* If there are any events pending then get the next one.
   */
  next_event = gdk_event_peek ();
  
  /* Try to compress enter/leave notify events. These event
   *  pairs occur when the mouse is dragged quickly across
   *  a window with many buttons (or through a menu). Instead
   *  of highlighting and de-highlighting each widget that
   *  is crossed it is better to simply de-highlight the widget
   *  which contained the mouse initially and highlight the
   *  widget which ends up containing the mouse.
   */
  if (next_event)
    if (((event->type == GDK_ENTER_NOTIFY) ||
         (event->type == GDK_LEAVE_NOTIFY)) &&
        ((next_event->type == GDK_ENTER_NOTIFY) ||
         (next_event->type == GDK_LEAVE_NOTIFY)) &&
        (next_event->type != event->type) &&
        (next_event->any.window == event->any.window))
      {
        /* Throw both the peeked copy and the queued copy away 
         */
        gdk_event_free (next_event);
        next_event = gdk_event_get ();
        gdk_event_free (next_event);
        
        return;
      }

  if (next_event)
    gdk_event_free (next_event);

  /* Find the widget which got the event. We store the widget
   *  in the user_data field of GdkWindow's.
   *  Ignore the event if we don't have a widget for it, except
   *  for GDK_PROPERTY_NOTIFY events which are handled specialy.
   *  Though this happens rarely, bogus events can occour
   *  for e.g. destroyed GdkWindows. 
   */
  event_widget = gtk_get_event_widget (event);
  if (!event_widget)
    {
      /* To handle selection INCR transactions, we select
       * PropertyNotify events on the requestor window and create
       * a corresponding (fake) GdkWindow so that events get
       * here. There won't be a widget though, so we have to handle
           * them specially
           */
      if (event->type == GDK_PROPERTY_NOTIFY)
        gtk_selection_incr_event (event->any.window,
                                  &event->property);
      else if (event->type == GDK_SETTING)
        _gtk_settings_handle_event (&event->setting);

      return;
    }

  /* If pointer or keyboard grabs are in effect, munge the events
   * so that each window group looks like a separate app.
   */
  rewritten_event = rewrite_event_for_grabs (event);
  if (rewritten_event)
    {
      event = rewritten_event;
      event_widget = gtk_get_event_widget (event);
    }
  
  window_group = gtk_main_get_window_group (event_widget);

  /* Push the event onto a stack of current events for
   * gtk_current_event_get().
   */
  current_events = g_list_prepend (current_events, event);

  /* If there is a grab in effect...
   */
  if (window_group->grabs)
    {
      grab_widget = window_group->grabs->data;
      
      /* If the grab widget is an ancestor of the event widget
       *  then we send the event to the original event widget.
       *  This is the key to implementing modality.
       */
      if (GTK_WIDGET_IS_SENSITIVE (event_widget) &&
          gtk_widget_is_ancestor (event_widget, grab_widget))
        grab_widget = event_widget;
    }
  else
    {
      grab_widget = event_widget;
    }

  /* Not all events get sent to the grabbing widget.
   * The delete, destroy, expose, focus change and resize
   *  events still get sent to the event widget because
   *  1) these events have no meaning for the grabbing widget
   *  and 2) redirecting these events to the grabbing widget
   *  could cause the display to be messed up.
   * 
   * Drag events are also not redirected, since it isn't
   *  clear what the semantics of that would be.
   */
  switch (event->type)
    {
    case GDK_NOTHING:
      break;
      
    case GDK_DELETE:
      gtk_widget_ref (event_widget);
      if ((!window_group->grabs || gtk_widget_get_toplevel (window_group->grabs->data) == event_widget) &&
          !gtk_widget_event (event_widget, event))
        gtk_widget_destroy (event_widget);
      gtk_widget_unref (event_widget);
      break;
      
    case GDK_DESTROY:
      /* Unexpected GDK_DESTROY from the outside, ignore for
       * child windows, handle like a GDK_DELETE for toplevels
       */
      if (!event_widget->parent)
        {
          gtk_widget_ref (event_widget);
          if (!gtk_widget_event (event_widget, event) &&
              GTK_WIDGET_REALIZED (event_widget))
            gtk_widget_destroy (event_widget);
          gtk_widget_unref (event_widget);
        }
      break;
      
    case GDK_EXPOSE:
      if (event->any.window && GTK_WIDGET_DOUBLE_BUFFERED (event_widget))
        {
          gdk_window_begin_paint_region (event->any.window, event->expose.region);
          gtk_widget_send_expose (event_widget, event);
          gdk_window_end_paint (event->any.window);
        }
      else
        gtk_widget_send_expose (event_widget, event);
      break;

    case GDK_PROPERTY_NOTIFY:
    case GDK_NO_EXPOSE:
    case GDK_FOCUS_CHANGE:
    case GDK_CONFIGURE:
    case GDK_MAP:
    case GDK_UNMAP:
    case GDK_SELECTION_CLEAR:
    case GDK_SELECTION_REQUEST:
    case GDK_SELECTION_NOTIFY:
    case GDK_CLIENT_EVENT:
    case GDK_VISIBILITY_NOTIFY:
    case GDK_WINDOW_STATE:
      gtk_widget_event (event_widget, event);
      break;

    case GDK_SCROLL:
    case GDK_BUTTON_PRESS:
    case GDK_2BUTTON_PRESS:
    case GDK_3BUTTON_PRESS:
      gtk_propagate_event (grab_widget, event);
      break;

    case GDK_KEY_PRESS:
    case GDK_KEY_RELEASE:
      if (key_snoopers)
        {
          if (gtk_invoke_key_snoopers (grab_widget, event))
            break;
        }
      /* else fall through */
    case GDK_MOTION_NOTIFY:
    case GDK_BUTTON_RELEASE:
    case GDK_PROXIMITY_IN:
    case GDK_PROXIMITY_OUT:
      gtk_propagate_event (grab_widget, event);
      break;
      
    case GDK_ENTER_NOTIFY:
      if (GTK_WIDGET_IS_SENSITIVE (grab_widget))
        {
          g_object_ref (event_widget);
          
          gtk_widget_event (grab_widget, event);
          if (event_widget == grab_widget)
            GTK_PRIVATE_SET_FLAG (event_widget, GTK_LEAVE_PENDING);
          
          g_object_unref (event_widget);
        }
      break;
      
    case GDK_LEAVE_NOTIFY:
      if (GTK_WIDGET_LEAVE_PENDING (event_widget))
        {
          GTK_PRIVATE_UNSET_FLAG (event_widget, GTK_LEAVE_PENDING);
          gtk_widget_event (event_widget, event);
        }
      else if (GTK_WIDGET_IS_SENSITIVE (grab_widget))
        gtk_widget_event (grab_widget, event);
      break;
      
    case GDK_DRAG_STATUS:
    case GDK_DROP_FINISHED:
      _gtk_drag_source_handle_event (event_widget, event);
      break;
    case GDK_DRAG_ENTER:
    case GDK_DRAG_LEAVE:
    case GDK_DRAG_MOTION:
    case GDK_DROP_START:
      _gtk_drag_dest_handle_event (event_widget, event);
      break;
    default:
      g_assert_not_reached ();
      break;
    }
  
  tmp_list = current_events;
  current_events = g_list_remove_link (current_events, tmp_list);
  g_list_free_1 (tmp_list);

  if (rewritten_event)
    gdk_event_free (rewritten_event);
}

gboolean
gtk_true (void)
{
  return TRUE;
}

gboolean
gtk_false (void)
{
  return FALSE;
}

static GtkWindowGroup *
gtk_main_get_window_group (GtkWidget   *widget)
{
  GtkWidget *toplevel = NULL;

  if (widget)
    toplevel = gtk_widget_get_toplevel (widget);

  if (toplevel && GTK_IS_WINDOW (toplevel))
    return _gtk_window_get_group (GTK_WINDOW (toplevel));
  else
    return _gtk_window_get_group (NULL);
}

typedef struct
{
  GtkWidget *old_grab_widget;
  GtkWidget *new_grab_widget;
} GrabNotifyInfo;

static gboolean
check_is_grabbed (GtkWidget *widget,
                  GtkWidget *grab_widget)
{
  if (grab_widget)
    return !(widget == grab_widget || gtk_widget_is_ancestor (widget, grab_widget));
  else
    return FALSE;
}

static void
gtk_grab_notify_foreach (GtkWidget *child,
                         gpointer   data)
                        
{
  GrabNotifyInfo *info = data;
  gboolean was_grabbed = check_is_grabbed (child, info->old_grab_widget);
  gboolean is_grabbed = check_is_grabbed (child, info->new_grab_widget);

  if (was_grabbed != is_grabbed)
    {
      g_object_ref (G_OBJECT (child));
      
      gtk_signal_emit_by_name (GTK_OBJECT (child), "grab_notify", was_grabbed);
      
      if (GTK_IS_CONTAINER (child))
        gtk_container_foreach (GTK_CONTAINER (child), gtk_grab_notify_foreach, info);
      
      g_object_unref (G_OBJECT (child));
    }
}

static void
gtk_grab_notify (GtkWindowGroup *group,
                 GtkWidget      *grab_widget,
                 gboolean        was_grabbed)
{
  GList *toplevels;
  GrabNotifyInfo info;

  if (was_grabbed)
    {
      info.old_grab_widget = grab_widget;
      info.new_grab_widget = group->grabs ? group->grabs->data : NULL;
    }
  else
    {
      info.old_grab_widget = (group->grabs && group->grabs->next) ? group->grabs->next->data : NULL;
      info.new_grab_widget = grab_widget;
    }

  g_object_ref (group);
  g_object_ref (grab_widget);

  toplevels = gtk_window_list_toplevels ();
  g_list_foreach (toplevels, (GFunc)g_object_ref, NULL);
                            
  while (toplevels)
    {
      GtkWindow *toplevel = toplevels->data;
      toplevels = g_list_delete_link (toplevels, toplevels);

      if (group == _gtk_window_get_group (toplevel))
        gtk_container_foreach (GTK_CONTAINER (toplevel), gtk_grab_notify_foreach, &info);
      g_object_unref (toplevel);
    }

  g_object_unref (group);
  g_object_unref (grab_widget);
}

void
gtk_grab_add (GtkWidget *widget)
{
  GtkWindowGroup *group;
  gboolean was_grabbed;
  
  g_return_if_fail (widget != NULL);
  
  if (!GTK_WIDGET_HAS_GRAB (widget) && GTK_WIDGET_IS_SENSITIVE (widget))
    {
      GTK_WIDGET_SET_FLAGS (widget, GTK_HAS_GRAB);
      
      group = gtk_main_get_window_group (widget);

      was_grabbed = (group->grabs != NULL);
      
      gtk_widget_ref (widget);
      group->grabs = g_slist_prepend (group->grabs, widget);

      gtk_grab_notify (group, widget, FALSE);
    }
}

GtkWidget*
gtk_grab_get_current (void)
{
  GtkWindowGroup *group;

  group = gtk_main_get_window_group (NULL);

  if (group->grabs)
    return GTK_WIDGET (group->grabs->data);
  return NULL;
}

void
gtk_grab_remove (GtkWidget *widget)
{
  GtkWindowGroup *group;
  
  g_return_if_fail (widget != NULL);
  
  if (GTK_WIDGET_HAS_GRAB (widget))
    {
      GTK_WIDGET_UNSET_FLAGS (widget, GTK_HAS_GRAB);

      group = gtk_main_get_window_group (widget);
      group->grabs = g_slist_remove (group->grabs, widget);
      
      gtk_widget_unref (widget);

      gtk_grab_notify (group, widget, TRUE);
    }
}

void
gtk_init_add (GtkFunction function,
              gpointer    data)
{
  GtkInitFunction *init;
  
  init = g_new (GtkInitFunction, 1);
  init->function = function;
  init->data = data;
  
  init_functions = g_list_prepend (init_functions, init);
}

guint
gtk_key_snooper_install (GtkKeySnoopFunc snooper,
                         gpointer        func_data)
{
  GtkKeySnooperData *data;
  static guint snooper_id = 1;

  g_return_val_if_fail (snooper != NULL, 0);

  data = g_new (GtkKeySnooperData, 1);
  data->func = snooper;
  data->func_data = func_data;
  data->id = snooper_id++;
  key_snoopers = g_slist_prepend (key_snoopers, data);

  return data->id;
}

void
gtk_key_snooper_remove (guint            snooper_id)
{
  GtkKeySnooperData *data = NULL;
  GSList *slist;

  slist = key_snoopers;
  while (slist)
    {
      data = slist->data;
      if (data->id == snooper_id)
        break;

      slist = slist->next;
      data = NULL;
    }
  if (data)
    key_snoopers = g_slist_remove (key_snoopers, data);
}

static gint
gtk_invoke_key_snoopers (GtkWidget *grab_widget,
                         GdkEvent  *event)
{
  GSList *slist;
  gint return_val = FALSE;

  slist = key_snoopers;
  while (slist && !return_val)
    {
      GtkKeySnooperData *data;

      data = slist->data;
      slist = slist->next;
      return_val = (*data->func) (grab_widget, (GdkEventKey*) event, data->func_data);
    }

  return return_val;
}

guint
gtk_quit_add_full (guint                main_level,
                   GtkFunction          function,
                   GtkCallbackMarshal   marshal,
                   gpointer             data,
                   GtkDestroyNotify     destroy)
{
  static guint quit_id = 1;
  GtkQuitFunction *quitf;
  
  g_return_val_if_fail ((function != NULL) || (marshal != NULL), 0);

  if (!quit_mem_chunk)
    quit_mem_chunk = g_mem_chunk_new ("quit mem chunk", sizeof (GtkQuitFunction),
                                      512, G_ALLOC_AND_FREE);
  
  quitf = g_chunk_new (GtkQuitFunction, quit_mem_chunk);
  
  quitf->id = quit_id++;
  quitf->main_level = main_level;
  quitf->function = function;
  quitf->marshal = marshal;
  quitf->data = data;
  quitf->destroy = destroy;

  quit_functions = g_list_prepend (quit_functions, quitf);
  
  return quitf->id;
}

static void
gtk_quit_destroy (GtkQuitFunction *quitf)
{
  if (quitf->destroy)
    quitf->destroy (quitf->data);
  g_mem_chunk_free (quit_mem_chunk, quitf);
}

static gint
gtk_quit_destructor (GtkObject **object_p)
{
  if (*object_p)
    gtk_object_destroy (*object_p);
  g_free (object_p);

  return FALSE;
}

void
gtk_quit_add_destroy (guint              main_level,
                      GtkObject         *object)
{
  GtkObject **object_p;

  g_return_if_fail (main_level > 0);
  g_return_if_fail (GTK_IS_OBJECT (object));

  object_p = g_new (GtkObject*, 1);
  *object_p = object;
  gtk_signal_connect (object,
                      "destroy",
                      GTK_SIGNAL_FUNC (gtk_widget_destroyed),
                      object_p);
  gtk_quit_add (main_level, (GtkFunction) gtk_quit_destructor, object_p);
}

guint
gtk_quit_add (guint       main_level,
              GtkFunction function,
              gpointer    data)
{
  return gtk_quit_add_full (main_level, function, NULL, data, NULL);
}

void
gtk_quit_remove (guint id)
{
  GtkQuitFunction *quitf;
  GList *tmp_list;
  
  tmp_list = quit_functions;
  while (tmp_list)
    {
      quitf = tmp_list->data;
      
      if (quitf->id == id)
        {
          quit_functions = g_list_remove_link (quit_functions, tmp_list);
          g_list_free (tmp_list);
          gtk_quit_destroy (quitf);
          
          return;
        }
      
      tmp_list = tmp_list->next;
    }
}

void
gtk_quit_remove_by_data (gpointer data)
{
  GtkQuitFunction *quitf;
  GList *tmp_list;
  
  tmp_list = quit_functions;
  while (tmp_list)
    {
      quitf = tmp_list->data;
      
      if (quitf->data == data)
        {
          quit_functions = g_list_remove_link (quit_functions, tmp_list);
          g_list_free (tmp_list);
          gtk_quit_destroy (quitf);

          return;
        }
      
      tmp_list = tmp_list->next;
    }
}

guint
gtk_timeout_add_full (guint32            interval,
                      GtkFunction        function,
                      GtkCallbackMarshal marshal,
                      gpointer           data,
                      GtkDestroyNotify   destroy)
{
  if (marshal)
    {
      GtkClosure *closure;

      closure = g_new (GtkClosure, 1);
      closure->marshal = marshal;
      closure->data = data;
      closure->destroy = destroy;

      return g_timeout_add_full (0, interval, 
                                 gtk_invoke_idle_timeout,
                                 closure,
                                 gtk_destroy_closure);
    }
  else
    return g_timeout_add_full (0, interval, function, data, destroy);
}

guint
gtk_timeout_add (guint32     interval,
                 GtkFunction function,
                 gpointer    data)
{
  return g_timeout_add_full (0, interval, function, data, NULL);
}

void
gtk_timeout_remove (guint tag)
{
  g_source_remove (tag);
}

guint
gtk_idle_add_full (gint                 priority,
                   GtkFunction          function,
                   GtkCallbackMarshal   marshal,
                   gpointer             data,
                   GtkDestroyNotify     destroy)
{
  if (marshal)
    {
      GtkClosure *closure;

      closure = g_new (GtkClosure, 1);
      closure->marshal = marshal;
      closure->data = data;
      closure->destroy = destroy;

      return g_idle_add_full (priority,
                              gtk_invoke_idle_timeout,
                              closure,
                              gtk_destroy_closure);
    }
  else
    return g_idle_add_full (priority, function, data, destroy);
}

guint
gtk_idle_add (GtkFunction function,
              gpointer    data)
{
  return g_idle_add_full (GTK_PRIORITY_DEFAULT, function, data, NULL);
}

guint       
gtk_idle_add_priority (gint        priority,
                       GtkFunction function,
                       gpointer    data)
{
  return g_idle_add_full (priority, function, data, NULL);
}

void
gtk_idle_remove (guint tag)
{
  g_source_remove (tag);
}

void
gtk_idle_remove_by_data (gpointer data)
{
  if (!g_idle_remove_by_data (data))
    g_warning ("gtk_idle_remove_by_data(%p): no such idle", data);
}

guint
gtk_input_add_full (gint                source,
                    GdkInputCondition   condition,
                    GdkInputFunction    function,
                    GtkCallbackMarshal  marshal,
                    gpointer            data,
                    GtkDestroyNotify    destroy)
{
  if (marshal)
    {
      GtkClosure *closure;

      closure = g_new (GtkClosure, 1);
      closure->marshal = marshal;
      closure->data = data;
      closure->destroy = destroy;

      return gdk_input_add_full (source,
                                 condition,
                                 (GdkInputFunction) gtk_invoke_input,
                                 closure,
                                 (GdkDestroyNotify) gtk_destroy_closure);
    }
  else
    return gdk_input_add_full (source, condition, function, data, destroy);
}

void
gtk_input_remove (guint tag)
{
  g_source_remove (tag);
}

static void
gtk_destroy_closure (gpointer data)
{
  GtkClosure *closure = data;

  if (closure->destroy)
    (closure->destroy) (closure->data);
  g_free (closure);
}

static gboolean
gtk_invoke_idle_timeout (gpointer data)
{
  GtkClosure *closure = data;

  GtkArg args[1];
  gint ret_val = FALSE;
  args[0].name = NULL;
  args[0].type = GTK_TYPE_BOOL;
  args[0].d.pointer_data = &ret_val;
  closure->marshal (NULL, closure->data,  0, args);
  return ret_val;
}

static void
gtk_invoke_input (gpointer          data,
                  gint              source,
                  GdkInputCondition condition)
{
  GtkClosure *closure = data;

  GtkArg args[3];
  args[0].type = GTK_TYPE_INT;
  args[0].name = NULL;
  GTK_VALUE_INT (args[0]) = source;
  args[1].type = GDK_TYPE_INPUT_CONDITION;
  args[1].name = NULL;
  GTK_VALUE_FLAGS (args[1]) = condition;
  args[2].type = GTK_TYPE_NONE;
  args[2].name = NULL;

  closure->marshal (NULL, closure->data, 2, args);
}

/**
 * gtk_get_current_event:
 * 
 * Obtains a copy of the event currently being processed by GTK+.  For
 * example, if you get a "clicked" signal from #GtkButton, the current
 * event will be the #GdkEventButton that triggered the "clicked"
 * signal. The returned event must be freed with gdk_event_free().
 * If there is no current event, the function returns %NULL.
 * 
 * Return value: a copy of the current event, or %NULL if no current event.
 **/
GdkEvent*
gtk_get_current_event (void)
{
  if (current_events)
    return gdk_event_copy (current_events->data);
  else
    return NULL;
}

/**
 * gtk_get_current_event_time:
 * 
 * If there is a current event and it has a timestamp, return that
 * timestamp, otherwise return %GDK_CURRENT_TIME.
 * 
 * Return value: the timestamp from the current event, or %GDK_CURRENT_TIME.
 **/
guint32
gtk_get_current_event_time (void)
{
  if (current_events)
    return gdk_event_get_time (current_events->data);
  else
    return GDK_CURRENT_TIME;
}

/**
 * gtk_get_current_event_state:
 * @state: a location to store the state of the current event
 * 
 * If there is a current event and it has a state field, place
 * that state field in @state and return %TRUE, otherwise return
 * %FALSE.
 * 
 * Return value: %TRUE if there was a current event and it had a state field
 **/
gboolean
gtk_get_current_event_state (GdkModifierType *state)
{
  g_return_val_if_fail (state != NULL, FALSE);
  
  if (current_events)
    return gdk_event_get_state (current_events->data, state);
  else
    {
      *state = 0;
      return FALSE;
    }
}

/**
 * gtk_get_event_widget:
 * @event: a #GdkEvent
 *
 * If @event is %NULL or the event was not associated with any widget,
 * returns %NULL, otherwise returns the widget that received the event
 * originally.
 * 
 * Return value: the widget that originally received @event, or %NULL
 **/
GtkWidget*
gtk_get_event_widget (GdkEvent *event)
{
  GtkWidget *widget;

  widget = NULL;
  if (event && event->any.window)
    gdk_window_get_user_data (event->any.window, (void**) &widget);
  
  return widget;
}

static gint
gtk_quit_invoke_function (GtkQuitFunction *quitf)
{
  if (!quitf->marshal)
    return quitf->function (quitf->data);
  else
    {
      GtkArg args[1];
      gint ret_val = FALSE;

      args[0].name = NULL;
      args[0].type = GTK_TYPE_BOOL;
      args[0].d.pointer_data = &ret_val;
      ((GtkCallbackMarshal) quitf->marshal) (NULL,
                                             quitf->data,
                                             0, args);
      return ret_val;
    }
}

/**
 * gtk_propagate_event:
 * @widget: a #GtkWidget
 * @event: an event
 *
 * Sends an event to a widget, propagating the event to parent widgets
 * if the event remains unhandled. Events received by GTK+ from GDK
 * normally begin in gtk_main_do_event(). Depending on the type of
 * event, existence of modal dialogs, grabs, etc., the event may be
 * propagated; if so, this function is used. gtk_propagate_event()
 * calls gtk_widget_event() on each widget it decides to send the
 * event to.  So gtk_widget_event() is the lowest-level function; it
 * simply emits the "event" and possibly an event-specific signal on a
 * widget.  gtk_propagate_event() is a bit higher-level, and
 * gtk_main_do_event() is the highest level.
 *
 * All that said, you most likely don't want to use any of these
 * functions; synthesizing events is rarely needed. Consider asking on
 * the mailing list for better ways to achieve your goals. For
 * example, use gdk_window_invalidate_rect() or
 * gtk_widget_queue_draw() instead of making up expose events.
 * 
 **/
void
gtk_propagate_event (GtkWidget *widget,
                     GdkEvent  *event)
{
  gint handled_event;
  
  g_return_if_fail (GTK_IS_WIDGET (widget));
  g_return_if_fail (event != NULL);
  
  handled_event = FALSE;

  gtk_widget_ref (widget);
      
  if ((event->type == GDK_KEY_PRESS) ||
      (event->type == GDK_KEY_RELEASE))
    {
      /* Only send key events within Window widgets to the Window
       *  The Window widget will in turn pass the
       *  key event on to the currently focused widget
       *  for that window.
       */
      GtkWidget *window;

      window = gtk_widget_get_toplevel (widget);
      if (window && GTK_IS_WINDOW (window))
        {
          /* If there is a grab within the window, give the grab widget
           * a first crack at the key event
           */
          if (widget != window && GTK_WIDGET_HAS_GRAB (widget))
            handled_event = gtk_widget_event (widget, event);
          
          if (!handled_event)
            {
              window = gtk_widget_get_toplevel (widget);
              if (window && GTK_IS_WINDOW (window))
                {
                  if (GTK_WIDGET_IS_SENSITIVE (window))
                    gtk_widget_event (window, event);
                }
            }
                  
          handled_event = TRUE; /* don't send to widget */
        }
    }
  
  /* Other events get propagated up the widget tree
   *  so that parents can see the button and motion
   *  events of the children.
   */
  if (!handled_event)
    {
      while (TRUE)
        {
          GtkWidget *tmp;
          
          handled_event = !GTK_WIDGET_IS_SENSITIVE (widget) || gtk_widget_event (widget, event);
          tmp = widget->parent;
          gtk_widget_unref (widget);

          widget = tmp;
          
          if (!handled_event && widget)
            gtk_widget_ref (widget);
          else
            break;
        }
    }
  else
    gtk_widget_unref (widget);
}

#if 0
static void
gtk_error (gchar *str)
{
  gtk_print (str);
}

static void
gtk_warning (gchar *str)
{
  gtk_print (str);
}

static void
gtk_message (gchar *str)
{
  gtk_print (str);
}

static void
gtk_print (gchar *str)
{
  static GtkWidget *window = NULL;
  static GtkWidget *text;
  static int level = 0;
  GtkWidget *box1;
  GtkWidget *box2;
  GtkWidget *table;
  GtkWidget *hscrollbar;
  GtkWidget *vscrollbar;
  GtkWidget *separator;
  GtkWidget *button;
  
  if (level > 0)
    {
      fputs (str, stdout);
      fflush (stdout);
      return;
    }
  
  if (!window)
    {
      window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
      
      gtk_signal_connect (GTK_OBJECT (window), "destroy",
                          (GtkSignalFunc) gtk_widget_destroyed,
                          &window);
      
      gtk_window_set_title (GTK_WINDOW (window), "Messages");
      
      box1 = gtk_vbox_new (FALSE, 0);
      gtk_container_add (GTK_CONTAINER (window), box1);
      gtk_widget_show (box1);
      
      
      box2 = gtk_vbox_new (FALSE, 10);
      gtk_container_set_border_width (GTK_CONTAINER (box2), 10);
      gtk_box_pack_start (GTK_BOX (box1), box2, TRUE, TRUE, 0);
      gtk_widget_show (box2);
      
      
      table = gtk_table_new (2, 2, FALSE);
      gtk_table_set_row_spacing (GTK_TABLE (table), 0, 2);
      gtk_table_set_col_spacing (GTK_TABLE (table), 0, 2);
      gtk_box_pack_start (GTK_BOX (box2), table, TRUE, TRUE, 0);
      gtk_widget_show (table);
      
      text = gtk_text_new (NULL, NULL);
      gtk_text_set_editable (GTK_TEXT (text), FALSE);
      gtk_table_attach_defaults (GTK_TABLE (table), text, 0, 1, 0, 1);
      gtk_widget_show (text);
      gtk_widget_realize (text);
      
      hscrollbar = gtk_hscrollbar_new (GTK_TEXT (text)->hadj);
      gtk_table_attach (GTK_TABLE (table), hscrollbar, 0, 1, 1, 2,
                        GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
      gtk_widget_show (hscrollbar);
      
      vscrollbar = gtk_vscrollbar_new (GTK_TEXT (text)->vadj);
      gtk_table_attach (GTK_TABLE (table), vscrollbar, 1, 2, 0, 1,
                        GTK_FILL, GTK_EXPAND | GTK_FILL, 0, 0);
      gtk_widget_show (vscrollbar);
      
      separator = gtk_hseparator_new ();
      gtk_box_pack_start (GTK_BOX (box1), separator, FALSE, TRUE, 0);
      gtk_widget_show (separator);
      
      
      box2 = gtk_vbox_new (FALSE, 10);
      gtk_container_set_border_width (GTK_CONTAINER (box2), 10);
      gtk_box_pack_start (GTK_BOX (box1), box2, FALSE, TRUE, 0);
      gtk_widget_show (box2);
      
      
      button = gtk_button_new_with_label ("close");
      gtk_signal_connect_object (GTK_OBJECT (button), "clicked",
                                 (GtkSignalFunc) gtk_widget_hide,
                                 GTK_OBJECT (window));
      gtk_box_pack_start (GTK_BOX (box2), button, TRUE, TRUE, 0);
      GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);
      gtk_widget_grab_default (button);
      gtk_widget_show (button);
    }
  
  level += 1;
  gtk_text_insert (GTK_TEXT (text), NULL, NULL, NULL, str, -1);
  level -= 1;
  
  if (!GTK_WIDGET_VISIBLE (window))
    gtk_widget_show (window);
}
#endif

gboolean
_gtk_boolean_handled_accumulator (GSignalInvocationHint *ihint,
                                  GValue                *return_accu,
                                  const GValue          *handler_return,
                                  gpointer               dummy)
{
  gboolean continue_emission;
  gboolean signal_handled;
  
  signal_handled = g_value_get_boolean (handler_return);
  g_value_set_boolean (return_accu, signal_handled);
  continue_emission = !signal_handled;
  
  return continue_emission;
}