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gtk2/gtk/gtkmain.c
William Jon McCann 37a8ee6e95 docs: fully break lines in examples 
Try to do a better job of keeping example content
from being too wide. It is often rendered as <pre>
text so the only time we can wrap it is in the source.

It is best to full break lines at all punctuation and
to try to keep the width under 70 chars or so.
2014-02-12 18:42:50 -05:00

2569 lines
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This file contains ambiguous Unicode characters

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/* 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, see <http://www.gnu.org/licenses/>.
*/
/*
* 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/.
*/
/**
* SECTION:gtkmain
* @Short_description: Library initialization, main event loop, and events
* @Title: Main loop and Events
* @See_also:See the GLib manual, especially #GMainLoop and signal-related
* functions such as g_signal_connect()
*
* Before using GTK+, you need to initialize it; initialization connects to the
* window system display, and parses some standard command line arguments. The
* gtk_init() macro initializes GTK+. gtk_init() exits the application if errors
* occur; to avoid this, use gtk_init_check(). gtk_init_check() allows you to
* recover from a failed GTK+ initialization - you might start up your
* application in text mode instead.
*
* Like all GUI toolkits, GTK+ uses an event-driven programming model. When the
* user is doing nothing, GTK+ sits in the “main loop” and
* waits for input. If the user performs some action - say, a mouse click - then
* the main loop “wakes up” and delivers an event to GTK+. GTK+ forwards the
* event to one or more widgets.
*
* When widgets receive an event, they frequently emit one or more
* “signals”. Signals notify your program that "something
* interesting happened" by invoking functions you’ve connected to the signal
* with g_signal_connect(). Functions connected to a signal are often termed
* “callbacks”.
*
* When your callbacks are invoked, you would typically take some action - for
* example, when an Open button is clicked you might display a
* #GtkFileChooserDialog. After a callback finishes, GTK+ will return to the
* main loop and await more user input.
*
* ## Typical main() function for a GTK+ application
*
* |[<!-- language="C" -->
* int
* main (int argc, char **argv)
* {
* /&ast; Initialize i18n support with
* bindtextdomain(), etc. &ast;/
* ...
*
* /&ast; Initialize the widget set &ast;/
* gtk_init (&argc, &argv);
*
* /&ast; Create the main window &ast;/
* mainwin = gtk_window_new (GTK_WINDOW_TOPLEVEL);
*
* /&ast; Set up our GUI elements &ast;/
* ...
*
* /&ast; Show the application window &ast;/
* gtk_widget_show_all (mainwin);
*
* /&ast; Enter the main event loop, and
* wait for user interaction &ast;/
* gtk_main ();
*
* /&ast; The user lost interest &ast;/
* return 0;
* }
* ]|
*
* It’s OK to use the GLib main loop directly instead of gtk_main(), though it
* involves slightly more typing. See #GMainLoop in the GLib documentation.
*/
#include "config.h"
#include "gdk/gdk.h"
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <sys/types.h> /* For uid_t, gid_t */
#ifdef G_OS_WIN32
#define STRICT
#include <windows.h>
#undef STRICT
#endif
#include "gtkintl.h"
#include "gtkaccelmapprivate.h"
#include "gtkbox.h"
#include "gtkclipboard.h"
#include "gtkdebug.h"
#include "gtkdnd.h"
#include "gtkmain.h"
#include "gtkmenu.h"
#include "gtkmodules.h"
#include "gtkmodulesprivate.h"
#include "gtkprivate.h"
#include "gtkrecentmanager.h"
#include "gtkselectionprivate.h"
#include "gtksettingsprivate.h"
#include "gtktooltip.h"
#include "gtkversion.h"
#include "gtkwidgetprivate.h"
#include "gtkwindowprivate.h"
#include "a11y/gtkaccessibility.h"
/* Private type definitions
*/
typedef struct _GtkKeySnooperData GtkKeySnooperData;
struct _GtkKeySnooperData
{
GtkKeySnoopFunc func;
gpointer func_data;
guint id;
};
static gint gtk_invoke_key_snoopers (GtkWidget *grab_widget,
GdkEvent *event);
static GtkWindowGroup *gtk_main_get_window_group (GtkWidget *widget);
static guint gtk_main_loop_level = 0;
static gint pre_initialized = FALSE;
static gint gtk_initialized = FALSE;
static GList *current_events = NULL;
static GSList *main_loops = NULL; /* stack of currently executing main loops */
static GSList *key_snoopers = NULL;
static guint 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},
{"modules", GTK_DEBUG_MODULES},
{"geometry", GTK_DEBUG_GEOMETRY},
{"icontheme", GTK_DEBUG_ICONTHEME},
{"printing", GTK_DEBUG_PRINTING},
{"builder", GTK_DEBUG_BUILDER},
{"size-request", GTK_DEBUG_SIZE_REQUEST},
{"no-css-cache", GTK_DEBUG_NO_CSS_CACHE},
{"baselines", GTK_DEBUG_BASELINES},
{"pixel-cache", GTK_DEBUG_PIXEL_CACHE},
{"no-pixel-cache", GTK_DEBUG_NO_PIXEL_CACHE}
};
#endif /* G_ENABLE_DEBUG */
/**
* gtk_get_major_version:
*
* Returns the major version number of the GTK+ library.
* (e.g. in GTK+ version 3.1.5 this is 3.)
*
* This function is in the library, so it represents the GTK+ library
* your code is running against. Contrast with the #GTK_MAJOR_VERSION
* macro, which represents the major version of the GTK+ headers you
* have included when compiling your code.
*
* Returns: the major version number of the GTK+ library
*
* Since: 3.0
*/
guint
gtk_get_major_version (void)
{
return GTK_MAJOR_VERSION;
}
/**
* gtk_get_minor_version:
*
* Returns the minor version number of the GTK+ library.
* (e.g. in GTK+ version 3.1.5 this is 1.)
*
* This function is in the library, so it represents the GTK+ library
* your code is are running against. Contrast with the
* #GTK_MINOR_VERSION macro, which represents the minor version of the
* GTK+ headers you have included when compiling your code.
*
* Returns: the minor version number of the GTK+ library
*
* Since: 3.0
*/
guint
gtk_get_minor_version (void)
{
return GTK_MINOR_VERSION;
}
/**
* gtk_get_micro_version:
*
* Returns the micro version number of the GTK+ library.
* (e.g. in GTK+ version 3.1.5 this is 5.)
*
* This function is in the library, so it represents the GTK+ library
* your code is are running against. Contrast with the
* #GTK_MICRO_VERSION macro, which represents the micro version of the
* GTK+ headers you have included when compiling your code.
*
* Returns: the micro version number of the GTK+ library
*
* Since: 3.0
*/
guint
gtk_get_micro_version (void)
{
return GTK_MICRO_VERSION;
}
/**
* gtk_get_binary_age:
*
* Returns the binary age as passed to `libtool`
* when building the GTK+ library the process is running against.
* If `libtool` means nothing to you, don't
* worry about it.
*
* Returns: the binary age of the GTK+ library
*
* Since: 3.0
*/
guint
gtk_get_binary_age (void)
{
return GTK_BINARY_AGE;
}
/**
* gtk_get_interface_age:
*
* Returns the interface age as passed to `libtool`
* when building the GTK+ library the process is running against.
* If `libtool` means nothing to you, don't
* worry about it.
*
* Returns: the interface age of the GTK+ library
*
* Since: 3.0
*/
guint
gtk_get_interface_age (void)
{
return GTK_INTERFACE_AGE;
}
/**
* gtk_check_version:
* @required_major: the required major version
* @required_minor: the required minor version
* @required_micro: the required micro version
*
* Checks that the GTK+ library in use is compatible with the
* given version. Generally you would pass in the constants
* #GTK_MAJOR_VERSION, #GTK_MINOR_VERSION, #GTK_MICRO_VERSION
* as the three arguments to this function; that produces
* a check that the library in use is compatible with
* the version of GTK+ the application or module was compiled
* against.
*
* Compatibility is defined by two things: first the version
* of the running library is newer than the version
* @required_major.required_minor.@required_micro. Second
* the running library must be binary compatible with the
* version @required_major.required_minor.@required_micro
* (same major version.)
*
* This function is primarily for GTK+ modules; the module
* can call this function to check that it wasn’t loaded
* into an incompatible version of GTK+. However, such a
* check isn’t completely reliable, since the module may be
* linked against an old version of GTK+ and calling the
* old version of gtk_check_version(), but still get loaded
* into an application using a newer version of GTK+.
*
* Return value: %NULL if the GTK+ library is compatible with the
* given version, or a string describing the version mismatch.
* The returned string is owned by GTK+ and should not be modified
* or freed.
*/
const 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;
}
static gboolean do_setlocale = TRUE;
/**
* gtk_disable_setlocale:
*
* Prevents gtk_init(), gtk_init_check(), gtk_init_with_args() and
* gtk_parse_args() from automatically
* calling `setlocale (LC_ALL, "")`. 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 (pre_initialized)
g_warning ("gtk_disable_setlocale() must be called before gtk_init()");
do_setlocale = FALSE;
}
#ifdef G_PLATFORM_WIN32
#undef gtk_init_check
#endif
static GString *gtk_modules_string = NULL;
static gboolean g_fatal_warnings = FALSE;
#ifdef G_ENABLE_DEBUG
static gboolean
gtk_arg_debug_cb (const char *key, const char *value, gpointer user_data)
{
debug_flags |= g_parse_debug_string (value,
gtk_debug_keys,
G_N_ELEMENTS (gtk_debug_keys));
return TRUE;
}
static gboolean
gtk_arg_no_debug_cb (const char *key, const char *value, gpointer user_data)
{
debug_flags &= ~g_parse_debug_string (value,
gtk_debug_keys,
G_N_ELEMENTS (gtk_debug_keys));
return TRUE;
}
#endif /* G_ENABLE_DEBUG */
static gboolean
gtk_arg_module_cb (const char *key, const char *value, gpointer user_data)
{
if (value && *value)
{
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, value);
}
return TRUE;
}
static const GOptionEntry gtk_args[] = {
{ "gtk-module", 0, 0, G_OPTION_ARG_CALLBACK, gtk_arg_module_cb,
/* Description of --gtk-module=MODULES in --help output */ N_("Load additional GTK+ modules"),
/* Placeholder in --gtk-module=MODULES in --help output */ N_("MODULES") },
{ "g-fatal-warnings", 0, 0, G_OPTION_ARG_NONE, &g_fatal_warnings,
/* Description of --g-fatal-warnings in --help output */ N_("Make all warnings fatal"), NULL },
#ifdef G_ENABLE_DEBUG
{ "gtk-debug", 0, 0, G_OPTION_ARG_CALLBACK, gtk_arg_debug_cb,
/* Description of --gtk-debug=FLAGS in --help output */ N_("GTK+ debugging flags to set"),
/* Placeholder in --gtk-debug=FLAGS in --help output */ N_("FLAGS") },
{ "gtk-no-debug", 0, 0, G_OPTION_ARG_CALLBACK, gtk_arg_no_debug_cb,
/* Description of --gtk-no-debug=FLAGS in --help output */ N_("GTK+ debugging flags to unset"),
/* Placeholder in --gtk-no-debug=FLAGS in --help output */ N_("FLAGS") },
#endif
{ NULL }
};
#ifdef G_OS_WIN32
static char *iso639_to_check = NULL;
static char *iso3166_to_check = NULL;
static char *script_to_check = NULL;
static gboolean setlocale_called = FALSE;
static BOOL CALLBACK
enum_locale_proc (LPTSTR locale)
{
LCID lcid;
char iso639[10];
char iso3166[10];
char *endptr;
lcid = strtoul (locale, &endptr, 16);
if (*endptr == '\0' &&
GetLocaleInfo (lcid, LOCALE_SISO639LANGNAME, iso639, sizeof (iso639)) &&
GetLocaleInfo (lcid, LOCALE_SISO3166CTRYNAME, iso3166, sizeof (iso3166)))
{
if (strcmp (iso639, iso639_to_check) == 0 &&
((iso3166_to_check != NULL &&
strcmp (iso3166, iso3166_to_check) == 0) ||
(iso3166_to_check == NULL &&
SUBLANGID (LANGIDFROMLCID (lcid)) == SUBLANG_DEFAULT)))
{
char language[100], country[100];
char locale[300];
if (script_to_check != NULL)
{
/* If lcid is the "other" script for this language,
* return TRUE, i.e. continue looking.
*/
if (strcmp (script_to_check, "Latn") == 0)
{
switch (LANGIDFROMLCID (lcid))
{
case MAKELANGID (LANG_AZERI, SUBLANG_AZERI_CYRILLIC):
return TRUE;
case MAKELANGID (LANG_UZBEK, SUBLANG_UZBEK_CYRILLIC):
return TRUE;
case MAKELANGID (LANG_SERBIAN, SUBLANG_SERBIAN_CYRILLIC):
return TRUE;
case MAKELANGID (LANG_SERBIAN, 0x07):
/* Serbian in Bosnia and Herzegovina, Cyrillic */
return TRUE;
}
}
else if (strcmp (script_to_check, "Cyrl") == 0)
{
switch (LANGIDFROMLCID (lcid))
{
case MAKELANGID (LANG_AZERI, SUBLANG_AZERI_LATIN):
return TRUE;
case MAKELANGID (LANG_UZBEK, SUBLANG_UZBEK_LATIN):
return TRUE;
case MAKELANGID (LANG_SERBIAN, SUBLANG_SERBIAN_LATIN):
return TRUE;
case MAKELANGID (LANG_SERBIAN, 0x06):
/* Serbian in Bosnia and Herzegovina, Latin */
return TRUE;
}
}
}
SetThreadLocale (lcid);
if (GetLocaleInfo (lcid, LOCALE_SENGLANGUAGE, language, sizeof (language)) &&
GetLocaleInfo (lcid, LOCALE_SENGCOUNTRY, country, sizeof (country)))
{
strcpy (locale, language);
strcat (locale, "_");
strcat (locale, country);
if (setlocale (LC_ALL, locale) != NULL)
setlocale_called = TRUE;
}
return FALSE;
}
}
return TRUE;
}
#endif
static void
setlocale_initialization (void)
{
static gboolean initialized = FALSE;
if (initialized)
return;
initialized = TRUE;
if (do_setlocale)
{
#ifdef G_OS_WIN32
/* If some of the POSIXish environment variables are set, set
* the Win32 thread locale correspondingly.
*/
char *p = getenv ("LC_ALL");
if (p == NULL)
p = getenv ("LANG");
if (p != NULL)
{
p = g_strdup (p);
if (strcmp (p, "C") == 0)
SetThreadLocale (LOCALE_SYSTEM_DEFAULT);
else
{
/* Check if one of the supported locales match the
* environment variable. If so, use that locale.
*/
iso639_to_check = p;
iso3166_to_check = strchr (iso639_to_check, '_');
if (iso3166_to_check != NULL)
{
*iso3166_to_check++ = '\0';
script_to_check = strchr (iso3166_to_check, '@');
if (script_to_check != NULL)
*script_to_check++ = '\0';
/* Handle special cases. */
/* The standard code for Serbia and Montenegro was
* "CS", but MSFT uses for some reason "SP". By now
* (October 2006), SP has split into two, "RS" and
* "ME", but don't bother trying to handle those
* yet. Do handle the even older "YU", though.
*/
if (strcmp (iso3166_to_check, "CS") == 0 ||
strcmp (iso3166_to_check, "YU") == 0)
iso3166_to_check = "SP";
}
else
{
script_to_check = strchr (iso639_to_check, '@');
if (script_to_check != NULL)
*script_to_check++ = '\0';
/* LANG_SERBIAN == LANG_CROATIAN, recognize just "sr" */
if (strcmp (iso639_to_check, "sr") == 0)
iso3166_to_check = "SP";
}
EnumSystemLocales (enum_locale_proc, LCID_SUPPORTED);
}
g_free (p);
}
if (!setlocale_called)
setlocale (LC_ALL, "");
#else
if (!setlocale (LC_ALL, ""))
g_warning ("Locale not supported by C library.\n\tUsing the fallback 'C' locale.");
#endif
}
}
static void
do_pre_parse_initialization (int *argc,
char ***argv)
{
const gchar *env_string;
if (pre_initialized)
return;
pre_initialized = TRUE;
if (_gtk_module_has_mixed_deps (NULL))
g_error ("GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported");
gdk_pre_parse_libgtk_only ();
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)
{
debug_flags = g_parse_debug_string (env_string,
gtk_debug_keys,
G_N_ELEMENTS (gtk_debug_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);
}
static void
gettext_initialization (void)
{
setlocale_initialization ();
#ifdef ENABLE_NLS
bindtextdomain (GETTEXT_PACKAGE, _gtk_get_localedir ());
bindtextdomain (GETTEXT_PACKAGE "-properties", _gtk_get_localedir ());
# ifdef HAVE_BIND_TEXTDOMAIN_CODESET
bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
bind_textdomain_codeset (GETTEXT_PACKAGE "-properties", "UTF-8");
# endif
#endif
}
static void
do_post_parse_initialization (int *argc,
char ***argv)
{
if (gtk_initialized)
return;
gettext_initialization ();
#ifdef SIGPIPE
signal (SIGPIPE, SIG_IGN);
#endif
if (g_fatal_warnings)
{
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);
}
if (debug_flags & GTK_DEBUG_UPDATES)
gdk_window_set_debug_updates (TRUE);
gtk_widget_set_default_direction (gtk_get_locale_direction ());
_gtk_ensure_resources ();
_gtk_accel_map_init ();
/* Set the 'initialized' flag.
*/
gtk_initialized = TRUE;
/* load gtk modules */
if (gtk_modules_string)
{
_gtk_modules_init (argc, argv, gtk_modules_string->str);
g_string_free (gtk_modules_string, TRUE);
}
else
{
_gtk_modules_init (argc, argv, NULL);
}
_gtk_accessibility_init ();
}
typedef struct
{
gboolean open_default_display;
} OptionGroupInfo;
static gboolean
pre_parse_hook (GOptionContext *context,
GOptionGroup *group,
gpointer data,
GError **error)
{
do_pre_parse_initialization (NULL, NULL);
return TRUE;
}
static gboolean
post_parse_hook (GOptionContext *context,
GOptionGroup *group,
gpointer data,
GError **error)
{
OptionGroupInfo *info = data;
do_post_parse_initialization (NULL, NULL);
if (info->open_default_display)
{
if (gdk_display_open_default_libgtk_only () == NULL)
{
const char *display_name = gdk_get_display_arg_name ();
g_set_error (error,
G_OPTION_ERROR,
G_OPTION_ERROR_FAILED,
_("Cannot open display: %s"),
display_name ? display_name : "" );
return FALSE;
}
}
return TRUE;
}
/**
* gtk_get_debug_flags:
*
* Returns the GTK+ debug flags.
*
* This function is intended for GTK+ modules that want
* to adjust their debug output based on GTK+ debug flags.
*
* Returns: the GTK+ debug flags.
*/
guint
gtk_get_debug_flags (void)
{
return debug_flags;
}
/**
* gtk_set_debug_flags:
*
* Sets the GTK+ debug flags.
*/
void
gtk_set_debug_flags (guint flags)
{
debug_flags = flags;
}
/**
* gtk_get_option_group: (skip)
* @open_default_display: whether to open the default display
* when parsing the commandline arguments
*
* Returns a #GOptionGroup for the commandline arguments recognized
* by GTK+ and GDK.
*
* You should add this group to your #GOptionContext
* with g_option_context_add_group(), if you are using
* g_option_context_parse() to parse your commandline arguments.
*
* Returns: a #GOptionGroup for the commandline arguments recognized
* by GTK+
*
* Since: 2.6
*/
GOptionGroup *
gtk_get_option_group (gboolean open_default_display)
{
GOptionGroup *group;
OptionGroupInfo *info;
gettext_initialization ();
info = g_new0 (OptionGroupInfo, 1);
info->open_default_display = open_default_display;
group = g_option_group_new ("gtk", _("GTK+ Options"), _("Show GTK+ Options"), info, g_free);
g_option_group_set_parse_hooks (group, pre_parse_hook, post_parse_hook);
gdk_add_option_entries_libgtk_only (group);
g_option_group_add_entries (group, gtk_args);
g_option_group_set_translation_domain (group, GETTEXT_PACKAGE);
return group;
}
/**
* gtk_init_with_args:
* @argc: (inout): Address of the `argc` parameter of
* your main() function (or 0 if @argv is %NULL). This will be changed if
* any arguments were handled.
* @argv: (array length=argc) (inout) (allow-none): Address of the
* `argv` parameter of main(), or %NULL. Any options
* understood by GTK+ are stripped before return.
* @parameter_string: (allow-none): a string which is displayed in
* the first line of `--help` output, after
* `programname [OPTION...]`
* @entries: (array zero-terminated=1): a %NULL-terminated array
* of #GOptionEntrys describing the options of your program
* @translation_domain: a translation domain to use for translating
* the `--help` output for the options in @entries
* and the @parameter_string with gettext(), or %NULL
* @error: a return location for errors
*
* This function does the same work as gtk_init_check().
* Additionally, it allows you to add your own commandline options,
* and it automatically generates nicely formatted
* `--help` output. Note that your program will
* be terminated after writing out the help output.
*
* Returns: %TRUE if the windowing system has been successfully
* initialized, %FALSE otherwise
*
* Since: 2.6
*/
gboolean
gtk_init_with_args (gint *argc,
gchar ***argv,
const gchar *parameter_string,
const GOptionEntry *entries,
const gchar *translation_domain,
GError **error)
{
GOptionContext *context;
GOptionGroup *gtk_group;
gboolean retval;
if (gtk_initialized)
return gdk_display_open_default_libgtk_only () != NULL;
gettext_initialization ();
if (!check_setugid ())
return FALSE;
gtk_group = gtk_get_option_group (TRUE);
context = g_option_context_new (parameter_string);
g_option_context_add_group (context, gtk_group);
g_option_context_set_translation_domain (context, translation_domain);
if (entries)
g_option_context_add_main_entries (context, entries, translation_domain);
retval = g_option_context_parse (context, argc, argv, error);
g_option_context_free (context);
return retval;
}
/**
* gtk_parse_args:
* @argc: (inout): a pointer to the number of command line arguments
* @argv: (array length=argc) (inout): a pointer to 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.
*
* There is no need to call this function explicitly 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)
{
GOptionContext *option_context;
GOptionGroup *gtk_group;
GError *error = NULL;
if (gtk_initialized)
return TRUE;
gettext_initialization ();
if (!check_setugid ())
return FALSE;
option_context = g_option_context_new (NULL);
g_option_context_set_ignore_unknown_options (option_context, TRUE);
g_option_context_set_help_enabled (option_context, FALSE);
gtk_group = gtk_get_option_group (FALSE);
g_option_context_set_main_group (option_context, gtk_group);
if (!g_option_context_parse (option_context, argc, argv, &error))
{
g_warning ("%s", error->message);
g_error_free (error);
}
g_option_context_free (option_context);
return TRUE;
}
#ifdef G_PLATFORM_WIN32
#undef gtk_init_check
#endif
/**
* gtk_init_check:
* @argc: (inout): Address of the `argc` parameter of
* your main() function (or 0 if @argv is %NULL). This will be changed if
* any arguments were handled.
* @argv: (array length=argc) (inout) (allow-none): Address of the
* `argv` parameter of main(), or %NULL. Any options
* understood by GTK+ 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 windowing system
* 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 windowing system has been successfully
* initialized, %FALSE otherwise
*/
gboolean
gtk_init_check (int *argc,
char ***argv)
{
if (!gtk_parse_args (argc, argv))
return FALSE;
return gdk_display_open_default_libgtk_only () != NULL;
}
#ifdef G_PLATFORM_WIN32
#undef gtk_init
#endif
/**
* gtk_init:
* @argc: (inout): Address of the `argc` parameter of
* your main() function (or 0 if @argv is %NULL). This will be changed if
* any arguments were handled.
* @argv: (array length=argc) (inout) (allow-none): Address of the
* `argv` parameter of main(), or %NULL. Any options
* understood by GTK+ 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.
*
* Although you are expected to pass the @argc, @argv parameters from main() to
* this function, it is possible to pass %NULL if @argv is not available or
* commandline handling is not required.
*
* @argc and @argv are adjusted accordingly so your own code will
* never see those standard arguments.
*
* Note that there are some alternative ways to initialize GTK+:
* if you are calling gtk_parse_args(), gtk_init_check(),
* gtk_init_with_args() or g_option_context_parse() with
* the option group returned by gtk_get_option_group(),
* you don’t have to call gtk_init().
*
* This function will terminate your program if it was unable to
* initialize the windowing system for some reason. If you want
* your program to fall back to a textual interface you want to
* call gtk_init_check() instead.
*
* Since 2.18, GTK+ calls `signal (SIGPIPE, SIG_IGN)`
* during initialization, to ignore SIGPIPE signals, since these are
* almost never wanted in graphical applications. If you do need to
* handle SIGPIPE for some reason, reset the handler after gtk_init(),
* but notice that other libraries (e.g. libdbus or gvfs) might do
* similar things.
*/
void
gtk_init (int *argc, char ***argv)
{
if (!gtk_init_check (argc, argv))
{
const char *display_name_arg = gdk_get_display_arg_name ();
if (display_name_arg == NULL)
display_name_arg = getenv("DISPLAY");
g_warning ("cannot open display: %s", display_name_arg ? display_name_arg : "");
exit (1);
}
}
#ifdef G_OS_WIN32
/* This is relevant when building with gcc for Windows (MinGW),
* where we want to be struct packing compatible with MSVC,
* i.e. use the -mms-bitfields switch.
* For Cygwin there should be no need to be compatible with MSVC,
* so no need to use G_PLATFORM_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 -mms-bitfields 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 -mms-bitfields 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
/**
* gtk_get_locale_direction:
*
* Get the direction of the current locale. This is the expected
* reading direction for text and UI.
*
* This function depends on the current locale being set with
* setlocale() and will default to setting the %GTK_TEXT_DIR_LTR
* direction otherwise. %GTK_TEXT_DIR_NONE will never be returned.
*
* GTK+ sets the default text direction according to the locale
* during gtk_init(), and you should normally use
* gtk_widget_get_direction() or gtk_widget_get_default_direction()
* to obtain the current direcion.
*
* This function is only needed rare cases when the locale is
* changed after GTK+ has already been initialized. In this case,
* you can use it to update the default text direction as follows:
*
* |[<!-- language="C" -->
* setlocale (LC_ALL, new_locale);
* direction = gtk_get_locale_direction ();
* gtk_widget_set_default_direction (direction);
* ]|
*
* Returns: the #GtkTextDirection of the current locale
*
* Since: 3.12
*/
GtkTextDirection
gtk_get_locale_direction (void)
{
/* 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
*/
gchar *e = _("default:LTR");
GtkTextDirection dir = GTK_TEXT_DIR_LTR;
if (g_strcmp0 (e, "default:RTL") == 0)
dir = GTK_TEXT_DIR_RTL;
else if (g_strcmp0 (e, "default:LTR") != 0)
g_warning ("Whoever translated default:LTR did so wrongly. Defaulting to LTR.\n");
return dir;
}
/**
* gtk_get_default_language:
*
* Returns the #PangoLanguage 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.
*
* This function is equivalent to pango_language_get_default().
* See that function for details.
*
* Return value: the default language as a #PangoLanguage,
* must not be freed
*/
PangoLanguage *
gtk_get_default_language (void)
{
return pango_language_get_default ();
}
/**
* gtk_main:
*
* Runs the main loop until gtk_main_quit() is called.
*
* You can nest calls to gtk_main(). In that case gtk_main_quit()
* will make the innermost invocation of the main loop return.
*/
void
gtk_main (void)
{
GMainLoop *loop;
gtk_main_loop_level++;
loop = g_main_loop_new (NULL, TRUE);
main_loops = g_slist_prepend (main_loops, loop);
if (g_main_loop_is_running (main_loops->data))
{
gdk_threads_leave ();
g_main_loop_run (loop);
gdk_threads_enter ();
gdk_flush ();
}
main_loops = g_slist_remove (main_loops, loop);
g_main_loop_unref (loop);
gtk_main_loop_level--;
if (gtk_main_loop_level == 0)
{
/* Keep this section in sync with gtk_application_shutdown() */
/* Try storing all clipboard data we have */
_gtk_clipboard_store_all ();
/* Synchronize the recent manager singleton */
_gtk_recent_manager_sync ();
}
}
/**
* gtk_main_level:
*
* Asks for the current nesting level of the main loop.
*
* Returns: the nesting level of the current invocation
* of the main loop
*/
guint
gtk_main_level (void)
{
return gtk_main_loop_level;
}
/**
* gtk_main_quit:
*
* Makes the innermost invocation of the main loop return
* when it regains control.
*/
void
gtk_main_quit (void)
{
g_return_if_fail (main_loops != NULL);
g_main_loop_quit (main_loops->data);
}
/**
* gtk_events_pending:
*
* Checks if any events are pending.
*
* This can be used to update the UI and invoke timeouts etc.
* while doing some time intensive computation.
*
* ## Updating the UI during a long computation
*
* |[<!-- language="C" -->
* /&ast; computation going on... &ast;/
*
* while (gtk_events_pending ())
* gtk_main_iteration ();
*
* /&ast; ...computation continued &ast;/
* ]|
*
* Returns: %TRUE if any events are pending, %FALSE otherwise
*/
gboolean
gtk_events_pending (void)
{
gboolean result;
gdk_threads_leave ();
result = g_main_context_pending (NULL);
gdk_threads_enter ();
return result;
}
/**
* gtk_main_iteration:
*
* Runs a single iteration of the mainloop.
*
* If no events are waiting to be processed GTK+ will block
* until the next event is noticed. If you don’t want to block
* look at gtk_main_iteration_do() or check if any events are
* pending with gtk_events_pending() first.
*
* Returns: %TRUE if gtk_main_quit() has been called for the
* innermost mainloop
*/
gboolean
gtk_main_iteration (void)
{
gdk_threads_leave ();
g_main_context_iteration (NULL, TRUE);
gdk_threads_enter ();
if (main_loops)
return !g_main_loop_is_running (main_loops->data);
else
return TRUE;
}
/**
* gtk_main_iteration_do:
* @blocking: %TRUE if you want GTK+ to block if no events are pending
*
* Runs a single iteration of the mainloop.
* If no events are available either return or block depending on
* the value of @blocking.
*
* Returns: %TRUE if gtk_main_quit() has been called for the
* innermost mainloop
*/
gboolean
gtk_main_iteration_do (gboolean blocking)
{
gdk_threads_leave ();
g_main_context_iteration (NULL, blocking);
gdk_threads_enter ();
if (main_loops)
return !g_main_loop_is_running (main_loops->data);
else
return TRUE;
}
/* private libgtk to libgdk interfaces */
gboolean gdk_device_grab_info_libgtk_only (GdkDisplay *display,
GdkDevice *device,
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_TOUCH_BEGIN:
case GDK_TOUCH_UPDATE:
case GDK_TOUCH_END:
case GDK_TOUCH_CANCEL:
rewrite_events_translate (event->any.window,
new_window,
&event->touch.x, &event->touch.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;
gpointer grab_widget_ptr;
gboolean owner_events;
GdkDisplay *display;
GdkDevice *device;
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:
case GDK_KEY_PRESS:
case GDK_KEY_RELEASE:
case GDK_TOUCH_BEGIN:
case GDK_TOUCH_UPDATE:
case GDK_TOUCH_END:
case GDK_TOUCH_CANCEL:
display = gdk_window_get_display (event->any.window);
device = gdk_event_get_device (event);
if (!gdk_device_grab_info_libgtk_only (display, device, &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, &grab_widget_ptr);
grab_widget = grab_widget_ptr;
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;
}
/**
* gtk_main_do_event:
* @event: An event to process (normally passed by GDK)
*
* Processes a single GDK event.
*
* This is public only to allow filtering of events between GDK and GTK+.
* You will not usually need to call this function directly.
*
* While you should not call this function directly, you might want to
* know how exactly events are handled. So here is what this function
* does with the event:
*
* 1. Compress enter/leave notify events. If the event passed build an
* enter/leave pair together with the next event (peeked from GDK), both
* events are thrown away. This is to avoid a backlog of (de-)highlighting
* widgets crossed by the pointer.
*
* 2. Find the widget which got the event. If the widget can’t be determined
* the event is thrown away unless it belongs to a INCR transaction.
*
* 3. Then the event is pushed onto a stack so you can query the currently
* handled event with gtk_get_current_event().
*
* 4. The event is sent to a widget. If a grab is active all events for widgets
* that are not in the contained in the grab widget are sent to the latter
* with a few exceptions:
* - Deletion and destruction events are still sent to the event widget for
* obvious reasons.
* - Events which directly relate to the visual representation of the event
* widget.
* - Leave events are delivered to the event widget if there was an enter
* event delivered to it before without the paired leave event.
* - Drag events are not redirected because it is unclear what the semantics
* of that would be.
* Another point of interest might be that all key events are first passed
* through the key snooper functions if there are any. Read the description
* of gtk_key_snooper_install() if you need this feature.
*
* 5. After finishing the delivery the event is popped from the event stack.
*/
void
gtk_main_do_event (GdkEvent *event)
{
GtkWidget *event_widget;
GtkWidget *grab_widget = NULL;
GtkWidget *topmost_widget = NULL;
GtkWindowGroup *window_group;
GdkEvent *rewritten_event = NULL;
GdkDevice *device;
GList *tmp_list;
if (event->type == GDK_SETTING)
{
_gtk_settings_handle_event (&event->setting);
return;
}
if (event->type == GDK_OWNER_CHANGE)
{
_gtk_clipboard_handle_event (&event->owner_change);
return;
}
/* 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 specially. Though this happens rarely,
* bogus events can occur 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);
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);
}
if (GTK_IS_WINDOW (event_widget))
{
if (_gtk_window_check_handle_wm_event (event))
return;
}
window_group = gtk_main_get_window_group (event_widget);
device = gdk_event_get_device (event);
/* check whether there is a (device) grab in effect... */
if (device)
grab_widget = gtk_window_group_get_current_device_grab (window_group, device);
if (!grab_widget)
grab_widget = gtk_window_group_get_current_grab (window_group);
/* Find out the topmost widget where captured event propagation
* should start, which is the widget holding the GTK+ grab
* if any, otherwise it's left NULL and events are emitted
* from the toplevel (or topmost parentless parent).
*/
if (grab_widget)
topmost_widget = grab_widget;
/* 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 (!grab_widget ||
((gtk_widget_is_sensitive (event_widget) || event->type == GDK_SCROLL) &&
gtk_widget_is_ancestor (event_widget, grab_widget)))
grab_widget = event_widget;
/* If the widget receiving events is actually blocked by another
* device GTK+ grab
*/
if (device &&
_gtk_window_group_widget_is_blocked_for_device (window_group, grab_widget, device))
{
if (rewritten_event)
gdk_event_free (rewritten_event);
return;
}
/* Push the event onto a stack of current events for
* gtk_current_event_get().
*/
current_events = g_list_prepend (current_events, event);
/* 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:
g_object_ref (event_widget);
if ((!gtk_window_group_get_current_grab (window_group) || gtk_widget_get_toplevel (gtk_window_group_get_current_grab (window_group)) == event_widget) &&
!gtk_widget_event (event_widget, event))
gtk_widget_destroy (event_widget);
g_object_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 (!gtk_widget_get_parent (event_widget))
{
g_object_ref (event_widget);
if (!gtk_widget_event (event_widget, event) &&
gtk_widget_get_realized (event_widget))
gtk_widget_destroy (event_widget);
g_object_unref (event_widget);
}
break;
case GDK_EXPOSE:
if (event->any.window && gtk_widget_get_double_buffered (event_widget))
{
/* We handle exposes only on native windows, relying on the
* draw() handler to propagate down to non-native windows.
* This is ok now that we child windows always are considered
* (semi)transparent.
*/
if (gdk_window_has_native (event->expose.window))
{
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
{
/* The app may paint with a previously allocated cairo_t,
* which will draw directly to the window. We can't catch cairo
* draw operations to automatically flush the window, thus we
* need to explicitly flush any outstanding moves or double
* buffering
*/
gdk_window_flush (event->any.window);
gtk_widget_send_expose (event_widget, event);
}
break;
case GDK_PROPERTY_NOTIFY:
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:
case GDK_GRAB_BROKEN:
case GDK_DAMAGE:
if (!_gtk_widget_captured_event (event_widget, event))
gtk_widget_event (event_widget, event);
break;
case GDK_SCROLL:
case GDK_BUTTON_PRESS:
case GDK_2BUTTON_PRESS:
case GDK_3BUTTON_PRESS:
case GDK_TOUCH_BEGIN:
if (!_gtk_propagate_captured_event (grab_widget, event, topmost_widget))
gtk_propagate_event (grab_widget, event);
break;
case GDK_KEY_PRESS:
case GDK_KEY_RELEASE:
if (gtk_invoke_key_snoopers (grab_widget, event))
break;
/* make focus visible in a window that receives a key event */
{
GtkWidget *window;
window = gtk_widget_get_toplevel (grab_widget);
if (GTK_IS_WINDOW (window))
gtk_window_set_focus_visible (GTK_WINDOW (window), TRUE);
}
/* Catch alt press to enable auto-mnemonics;
* menus are handled elsewhere
* FIXME: this does not work with mnemonic modifiers other than Alt
*/
if ((event->key.keyval == GDK_KEY_Alt_L || event->key.keyval == GDK_KEY_Alt_R) &&
((event->key.state & (gtk_accelerator_get_default_mod_mask ()) & ~(GDK_RELEASE_MASK|GDK_MOD1_MASK)) == 0) &&
!GTK_IS_MENU_SHELL (grab_widget))
{
gboolean mnemonics_visible;
GtkWidget *window;
mnemonics_visible = (event->type == GDK_KEY_PRESS);
window = gtk_widget_get_toplevel (grab_widget);
if (GTK_IS_WINDOW (window))
{
if (mnemonics_visible)
_gtk_window_schedule_mnemonics_visible (GTK_WINDOW (window));
else
gtk_window_set_mnemonics_visible (GTK_WINDOW (window), FALSE);
}
}
/* else fall through */
case GDK_MOTION_NOTIFY:
case GDK_BUTTON_RELEASE:
case GDK_PROXIMITY_IN:
case GDK_PROXIMITY_OUT:
case GDK_TOUCH_UPDATE:
case GDK_TOUCH_END:
case GDK_TOUCH_CANCEL:
if (!_gtk_propagate_captured_event (grab_widget, event, topmost_widget))
gtk_propagate_event (grab_widget, event);
break;
case GDK_ENTER_NOTIFY:
if (event->crossing.detail != GDK_NOTIFY_VIRTUAL &&
event->crossing.detail != GDK_NOTIFY_NONLINEAR_VIRTUAL)
_gtk_widget_set_device_window (event_widget,
gdk_event_get_device (event),
event->any.window);
if (gtk_widget_is_sensitive (grab_widget) &&
!_gtk_propagate_captured_event (grab_widget, event, topmost_widget))
gtk_widget_event (grab_widget, event);
break;
case GDK_LEAVE_NOTIFY:
if (event->crossing.detail != GDK_NOTIFY_VIRTUAL &&
event->crossing.detail != GDK_NOTIFY_NONLINEAR_VIRTUAL)
_gtk_widget_set_device_window (event_widget,
gdk_event_get_device (event),
NULL);
if (gtk_widget_is_sensitive (grab_widget) &&
!_gtk_propagate_captured_event (grab_widget, event, topmost_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;
}
if (event->type == GDK_ENTER_NOTIFY
|| event->type == GDK_LEAVE_NOTIFY
|| event->type == GDK_BUTTON_PRESS
|| event->type == GDK_2BUTTON_PRESS
|| event->type == GDK_3BUTTON_PRESS
|| event->type == GDK_KEY_PRESS
|| event->type == GDK_DRAG_ENTER
|| event->type == GDK_GRAB_BROKEN
|| event->type == GDK_MOTION_NOTIFY
|| event->type == GDK_TOUCH_UPDATE
|| event->type == GDK_SCROLL)
{
_gtk_tooltip_handle_event (event);
}
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);
}
/**
* gtk_true:
*
* All this function does it to return %TRUE.
*
* This can be useful for example if you want to inhibit the deletion
* of a window. Of course you should not do this as the user expects
* a reaction from clicking the close icon of the window...
*
* ## A persistent window
*
* |[<!-- language="C" -->
* #include <gtk/gtk.h>
*
* int
* main (int argc, char **argv)
* {
* GtkWidget *win, *but;
* const char *text = "Close yourself. I mean it!";
*
* gtk_init (&argc, &argv);
*
* win = gtk_window_new (GTK_WINDOW_TOPLEVEL);
* g_signal_connect (win,
* "delete-event",
* G_CALLBACK (gtk_true),
* NULL);
* g_signal_connect (win, "destroy",
* G_CALLBACK (gtk_main_quit),
* NULL);
*
* but = gtk_button_new_with_label (text);
* g_signal_connect_swapped (but, "clicked",
* G_CALLBACK (gtk_object_destroy),
* win);
* gtk_container_add (GTK_CONTAINER (win), but);
*
* gtk_widget_show_all (win);
*
* gtk_main ();
*
* return 0;
* }
* ]|
*
* Returns: %TRUE
*/
gboolean
gtk_true (void)
{
return TRUE;
}
/**
* gtk_false:
*
* Analogical to gtk_true(), this function does nothing
* but always returns %FALSE.
*
* Returns: %FALSE
*/
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 (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;
gboolean was_grabbed;
gboolean is_grabbed;
gboolean from_grab;
GList *notified_windows;
GdkDevice *device;
} GrabNotifyInfo;
static void
synth_crossing_for_grab_notify (GtkWidget *from,
GtkWidget *to,
GrabNotifyInfo *info,
GList *devices,
GdkCrossingMode mode)
{
while (devices)
{
GdkDevice *device = devices->data;
GdkWindow *from_window, *to_window;
/* Do not propagate events more than once to
* the same windows if non-multidevice aware.
*/
if (!from)
from_window = NULL;
else
{
from_window = _gtk_widget_get_device_window (from, device);
if (from_window &&
!gdk_window_get_support_multidevice (from_window) &&
g_list_find (info->notified_windows, from_window))
from_window = NULL;
}
if (!to)
to_window = NULL;
else
{
to_window = _gtk_widget_get_device_window (to, device);
if (to_window &&
!gdk_window_get_support_multidevice (to_window) &&
g_list_find (info->notified_windows, to_window))
to_window = NULL;
}
if (from_window || to_window)
{
_gtk_widget_synthesize_crossing ((from_window) ? from : NULL,
(to_window) ? to : NULL,
device, mode);
if (from_window)
info->notified_windows = g_list_prepend (info->notified_windows, from_window);
if (to_window)
info->notified_windows = g_list_prepend (info->notified_windows, to_window);
}
devices = devices->next;
}
}
static void
gtk_grab_notify_foreach (GtkWidget *child,
gpointer data)
{
GrabNotifyInfo *info = data;
gboolean was_grabbed, is_grabbed, was_shadowed, is_shadowed;
GList *devices;
was_grabbed = info->was_grabbed;
is_grabbed = info->is_grabbed;
info->was_grabbed = info->was_grabbed || (child == info->old_grab_widget);
info->is_grabbed = info->is_grabbed || (child == info->new_grab_widget);
was_shadowed = info->old_grab_widget && !info->was_grabbed;
is_shadowed = info->new_grab_widget && !info->is_grabbed;
g_object_ref (child);
if ((was_shadowed || is_shadowed) && GTK_IS_CONTAINER (child))
gtk_container_forall (GTK_CONTAINER (child), gtk_grab_notify_foreach, info);
if (info->device &&
_gtk_widget_get_device_window (child, info->device))
{
/* Device specified and is on widget */
devices = g_list_prepend (NULL, info->device);
}
else
devices = _gtk_widget_list_devices (child);
if (is_shadowed)
{
_gtk_widget_set_shadowed (child, TRUE);
if (!was_shadowed && devices &&
gtk_widget_is_sensitive (child))
synth_crossing_for_grab_notify (child, info->new_grab_widget,
info, devices,
GDK_CROSSING_GTK_GRAB);
}
else
{
_gtk_widget_set_shadowed (child, FALSE);
if (was_shadowed && devices &&
gtk_widget_is_sensitive (child))
synth_crossing_for_grab_notify (info->old_grab_widget, child,
info, devices,
info->from_grab ? GDK_CROSSING_GTK_GRAB :
GDK_CROSSING_GTK_UNGRAB);
}
if (was_shadowed != is_shadowed)
_gtk_widget_grab_notify (child, was_shadowed);
g_object_unref (child);
g_list_free (devices);
info->was_grabbed = was_grabbed;
info->is_grabbed = is_grabbed;
}
static void
gtk_grab_notify (GtkWindowGroup *group,
GdkDevice *device,
GtkWidget *old_grab_widget,
GtkWidget *new_grab_widget,
gboolean from_grab)
{
GList *toplevels;
GrabNotifyInfo info = { 0 };
if (old_grab_widget == new_grab_widget)
return;
info.old_grab_widget = old_grab_widget;
info.new_grab_widget = new_grab_widget;
info.from_grab = from_grab;
info.device = device;
g_object_ref (group);
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);
info.was_grabbed = FALSE;
info.is_grabbed = FALSE;
if (group == gtk_window_get_group (toplevel))
gtk_grab_notify_foreach (GTK_WIDGET (toplevel), &info);
g_object_unref (toplevel);
}
g_list_free (info.notified_windows);
g_object_unref (group);
}
/**
* gtk_grab_add: (method)
* @widget: The widget that grabs keyboard and pointer events
*
* Makes @widget the current grabbed widget.
*
* This means that interaction with other widgets in the same
* application is blocked and mouse as well as keyboard events
* are delivered to this widget.
*
* If @widget is not sensitive, it is not set as the current
* grabbed widget and this function does nothing.
*/
void
gtk_grab_add (GtkWidget *widget)
{
GtkWindowGroup *group;
GtkWidget *old_grab_widget;
g_return_if_fail (widget != NULL);
if (!gtk_widget_has_grab (widget) && gtk_widget_is_sensitive (widget))
{
_gtk_widget_set_has_grab (widget, TRUE);
group = gtk_main_get_window_group (widget);
old_grab_widget = gtk_window_group_get_current_grab (group);
g_object_ref (widget);
_gtk_window_group_add_grab (group, widget);
gtk_grab_notify (group, NULL, old_grab_widget, widget, TRUE);
}
}
/**
* gtk_grab_get_current:
*
* Queries the current grab of the default window group.
*
* Return value: (transfer none): The widget which currently
* has the grab or %NULL if no grab is active
*/
GtkWidget*
gtk_grab_get_current (void)
{
GtkWindowGroup *group;
group = gtk_main_get_window_group (NULL);
return gtk_window_group_get_current_grab (group);
}
/**
* gtk_grab_remove: (method)
* @widget: The widget which gives up the grab
*
* Removes the grab from the given widget.
*
* You have to pair calls to gtk_grab_add() and gtk_grab_remove().
*
* If @widget does not have the grab, this function does nothing.
*/
void
gtk_grab_remove (GtkWidget *widget)
{
GtkWindowGroup *group;
GtkWidget *new_grab_widget;
g_return_if_fail (widget != NULL);
if (gtk_widget_has_grab (widget))
{
_gtk_widget_set_has_grab (widget, FALSE);
group = gtk_main_get_window_group (widget);
_gtk_window_group_remove_grab (group, widget);
new_grab_widget = gtk_window_group_get_current_grab (group);
gtk_grab_notify (group, NULL, widget, new_grab_widget, FALSE);
g_object_unref (widget);
}
}
/**
* gtk_device_grab_add:
* @widget: a #GtkWidget
* @device: a #GdkDevice to grab on.
* @block_others: %TRUE to prevent other devices to interact with @widget.
*
* Adds a GTK+ grab on @device, so all the events on @device and its
* associated pointer or keyboard (if any) are delivered to @widget.
* If the @block_others parameter is %TRUE, any other devices will be
* unable to interact with @widget during the grab.
*
* Since: 3.0
*/
void
gtk_device_grab_add (GtkWidget *widget,
GdkDevice *device,
gboolean block_others)
{
GtkWindowGroup *group;
GtkWidget *old_grab_widget;
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (GDK_IS_DEVICE (device));
group = gtk_main_get_window_group (widget);
old_grab_widget = gtk_window_group_get_current_device_grab (group, device);
if (old_grab_widget != widget)
_gtk_window_group_add_device_grab (group, widget, device, block_others);
gtk_grab_notify (group, device, old_grab_widget, widget, TRUE);
}
/**
* gtk_device_grab_remove:
* @widget: a #GtkWidget
* @device: a #GdkDevice
*
* Removes a device grab from the given widget.
*
* You have to pair calls to gtk_device_grab_add() and
* gtk_device_grab_remove().
*
* Since: 3.0
*/
void
gtk_device_grab_remove (GtkWidget *widget,
GdkDevice *device)
{
GtkWindowGroup *group;
GtkWidget *new_grab_widget;
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (GDK_IS_DEVICE (device));
group = gtk_main_get_window_group (widget);
_gtk_window_group_remove_device_grab (group, widget, device);
new_grab_widget = gtk_window_group_get_current_device_grab (group, device);
gtk_grab_notify (group, device, widget, new_grab_widget, FALSE);
}
/**
* gtk_key_snooper_install: (skip)
* @snooper: a #GtkKeySnoopFunc
* @func_data: data to pass to @snooper
*
* Installs a key snooper function, which will get called on all
* key events before delivering them normally.
*
* Returns: a unique id for this key snooper for use with
* gtk_key_snooper_remove().
*
* Deprecated: 3.4: Key snooping should not be done. Events should
* be handled by widgets.
*/
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;
}
/**
* gtk_key_snooper_remove:
* @snooper_handler_id: Identifies the key snooper to remove
*
* Removes the key snooper function with the given id.
*
* Deprecated: 3.4: Key snooping should not be done. Events should
* be handled by widgets.
*/
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);
g_free (data);
}
}
static gint
gtk_invoke_key_snoopers (GtkWidget *grab_widget,
GdkEvent *event)
{
GSList *slist;
gint return_val = FALSE;
return_val = _gtk_accessibility_key_snooper (grab_widget, (GdkEventKey *) event);
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;
}
/**
* gtk_get_current_event:
*
* Obtains a copy of the event currently being processed by GTK+.
*
* For example, if you are handling a #GtkButton::clicked signal,
* the current event will be the #GdkEventButton that triggered
* the ::clicked signal.
*
* Return value: (transfer full): a copy of the current event, or
* %NULL if there is no current event. The returned event must be
* freed with gdk_event_free().
*/
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: (out): 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_current_event_device:
*
* If there is a current event and it has a device, return that
* device, otherwise return %NULL.
*
* Returns: (transfer none): a #GdkDevice, or %NULL
*/
GdkDevice *
gtk_get_current_event_device (void)
{
if (current_events)
return gdk_event_get_device (current_events->data);
else
return NULL;
}
/**
* 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: (transfer none): the widget that originally
* received @event, or %NULL
*/
GtkWidget*
gtk_get_event_widget (GdkEvent *event)
{
GtkWidget *widget;
gpointer widget_ptr;
widget = NULL;
if (event && event->any.window &&
(event->type == GDK_DESTROY || !gdk_window_is_destroyed (event->any.window)))
{
gdk_window_get_user_data (event->any.window, &widget_ptr);
widget = widget_ptr;
}
return widget;
}
static gboolean
propagate_event_up (GtkWidget *widget,
GdkEvent *event,
GtkWidget *topmost)
{
gboolean handled_event = FALSE;
/* Propagate event up the widget tree so that
* parents can see the button and motion
* events of the children.
*/
while (TRUE)
{
GtkWidget *tmp;
g_object_ref (widget);
/* Scroll events are special cased here because it
* feels wrong when scrolling a GtkViewport, say,
* to have children of the viewport eat the scroll
* event
*/
if (!gtk_widget_is_sensitive (widget))
handled_event = event->type != GDK_SCROLL;
else
handled_event = gtk_widget_event (widget, event);
tmp = gtk_widget_get_parent (widget);
g_object_unref (widget);
if (widget == topmost)
break;
widget = tmp;
if (handled_event || !widget)
break;
}
return handled_event;
}
static gboolean
propagate_event_down (GtkWidget *widget,
GdkEvent *event,
GtkWidget *topmost)
{
gint handled_event = FALSE;
GList *widgets = NULL;
GList *l;
widgets = g_list_prepend (widgets, g_object_ref (widget));
while (widget && widget != topmost)
{
widget = gtk_widget_get_parent (widget);
if (!widget)
break;
widgets = g_list_prepend (widgets, g_object_ref (widget));
if (widget == topmost)
break;
}
for (l = widgets; l && !handled_event; l = g_list_next (l))
{
widget = (GtkWidget *)l->data;
if (!gtk_widget_is_sensitive (widget))
{
/* stop propagating on SCROLL, but don't handle the event, so it
* can propagate up again and reach its handling widget
*/
if (event->type == GDK_SCROLL)
break;
else
handled_event = TRUE;
}
else
handled_event = _gtk_widget_captured_event (widget, event);
}
g_list_free_full (widgets, (GDestroyNotify)g_object_unref);
return handled_event;
}
static gboolean
propagate_event (GtkWidget *widget,
GdkEvent *event,
gboolean captured,
GtkWidget *topmost)
{
gboolean handled_event = FALSE;
gboolean (* propagate_func) (GtkWidget *widget, GdkEvent *event);
propagate_func = captured ? _gtk_widget_captured_event : gtk_widget_event;
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 (GTK_IS_WINDOW (window))
{
g_object_ref (widget);
/* 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 = propagate_func (widget, event);
if (!handled_event)
{
window = gtk_widget_get_toplevel (widget);
if (GTK_IS_WINDOW (window))
{
if (gtk_widget_is_sensitive (window))
handled_event = propagate_func (window, event);
}
}
g_object_unref (widget);
return handled_event;
}
}
/* Other events get propagated up/down the widget tree */
return captured ?
propagate_event_down (widget, event, topmost) :
propagate_event_up (widget, event, topmost);
}
/**
* 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 #GtkWidget::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. There are almost
* certainly 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)
{
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (event != NULL);
propagate_event (widget, event, FALSE, NULL);
}
gboolean
_gtk_propagate_captured_event (GtkWidget *widget,
GdkEvent *event,
GtkWidget *topmost)
{
return propagate_event (widget, event, TRUE, topmost);
}
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