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gtk2/gtk/gtkmain.c
Timm Bäder e2e91bf9bc Fix a few documentation issues
2017-07-19 21:27:15 -04:00

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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)
* {
* // Initialize i18n support with bindtextdomain(), etc.
*
* ...
*
* // Initialize the widget set
* gtk_init ();
*
* // Create the main window
* mainwin = gtk_window_new (GTK_WINDOW_TOPLEVEL);
*
* // Set up our GUI elements
*
* ...
*
* // Show the application window
* gtk_widget_show (mainwin);
*
* // Enter the main event loop, and wait for user interaction
* gtk_main ();
*
* // The user lost interest
* 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 "gdk/gdk-private.h"
#include "gsk/gskprivate.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 "gtkclipboardprivate.h"
#include "gtkdebug.h"
#include "gtkdebugupdatesprivate.h"
#include "gtkdndprivate.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 "gtktooltipprivate.h"
#include "gtkversion.h"
#include "gtkwidgetprivate.h"
#include "gtkwindowprivate.h"
#include "gtkwindowgroup.h"
#include "a11y/gtkaccessibility.h"
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 */
typedef struct {
GdkDisplay *display;
guint flags;
} DisplayDebugFlags;
#define N_DEBUG_DISPLAYS 4
DisplayDebugFlags debug_flags[N_DEBUG_DISPLAYS];
#ifdef G_ENABLE_DEBUG
static const GDebugKey gtk_debug_keys[] = {
{ "misc", GTK_DEBUG_MISC },
{ "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 },
{ "interactive", GTK_DEBUG_INTERACTIVE },
{ "touchscreen", GTK_DEBUG_TOUCHSCREEN },
{ "actions", GTK_DEBUG_ACTIONS },
{ "resize", GTK_DEBUG_RESIZE },
{ "layout", GTK_DEBUG_LAYOUT },
{ "snapshot", GTK_DEBUG_SNAPSHOT }
};
#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+.
*
* Returns: (nullable): %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
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() 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;
#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 (void)
{
const gchar *env_string;
double slowdown;
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 ();
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[0].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 ("GTK3_MODULES");
if (env_string)
gtk_modules_string = g_string_new (env_string);
env_string = g_getenv ("GTK_MODULES");
if (env_string)
{
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, env_string);
}
env_string = g_getenv ("GTK_SLOWDOWN");
if (env_string)
{
slowdown = g_ascii_strtod (env_string, NULL);
_gtk_set_slowdown (slowdown);
}
}
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
default_display_notify_cb (GdkDisplayManager *dm)
{
_gtk_accessibility_init ();
debug_flags[0].display = gdk_display_get_default ();
}
static void
do_post_parse_initialization (void)
{
GdkDisplayManager *display_manager;
if (gtk_initialized)
return;
gettext_initialization ();
#ifdef SIGPIPE
signal (SIGPIPE, SIG_IGN);
#endif
if (debug_flags[0].flags & GTK_DEBUG_UPDATES)
gtk_debug_updates_set_enabled (TRUE);
gtk_widget_set_default_direction (gtk_get_locale_direction ());
gsk_ensure_resources ();
_gtk_ensure_resources ();
_gtk_accel_map_init ();
gtk_initialized = TRUE;
if (gtk_modules_string)
{
_gtk_modules_init (NULL, NULL, gtk_modules_string->str);
g_string_free (gtk_modules_string, TRUE);
}
else
{
_gtk_modules_init (NULL, NULL, NULL);
}
display_manager = gdk_display_manager_get ();
if (gdk_display_manager_get_default_display (display_manager) != NULL)
_gtk_accessibility_init ();
g_signal_connect (display_manager, "notify::default-display",
G_CALLBACK (default_display_notify_cb),
NULL);
}
guint
gtk_get_display_debug_flags (GdkDisplay *display)
{
gint i;
for (i = 0; i < N_DEBUG_DISPLAYS; i++)
{
if (debug_flags[i].display == display)
return debug_flags[i].flags;
}
return 0;
}
void
gtk_set_display_debug_flags (GdkDisplay *display,
guint flags)
{
gint i;
for (i = 0; i < N_DEBUG_DISPLAYS; i++)
{
if (debug_flags[i].display == NULL)
debug_flags[i].display = display;
if (debug_flags[i].display == display)
{
debug_flags[i].flags = flags;
return;
}
}
}
/**
* 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 gtk_get_display_debug_flags (gdk_display_get_default ());
}
/**
* gtk_set_debug_flags:
*
* Sets the GTK+ debug flags.
*/
void
gtk_set_debug_flags (guint flags)
{
gtk_set_display_debug_flags (gdk_display_get_default (), flags);
}
gboolean
gtk_simulate_touchscreen (void)
{
static gint test_touchscreen;
if (test_touchscreen == 0)
test_touchscreen = g_getenv ("GTK_TEST_TOUCHSCREEN") != NULL ? 1 : -1;
return test_touchscreen > 0 || (gtk_get_debug_flags () & GTK_DEBUG_TOUCHSCREEN) != 0;
}
#ifdef G_PLATFORM_WIN32
#undef gtk_init_check
#endif
/**
* gtk_init_check:
*
* 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.
*
* Returns: %TRUE if the windowing system has been successfully
* initialized, %FALSE otherwise
*/
gboolean
gtk_init_check (void)
{
gboolean ret;
if (gtk_initialized)
return TRUE;
gettext_initialization ();
if (!check_setugid ())
return FALSE;
do_pre_parse_initialization ();
do_post_parse_initialization ();
ret = gdk_display_open_default () != NULL;
if (gtk_get_debug_flags () & GTK_DEBUG_INTERACTIVE)
gtk_window_set_interactive_debugging (TRUE);
return ret;
}
#ifdef G_PLATFORM_WIN32
#undef gtk_init
#endif
/**
* gtk_init:
*
* 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.
*
* If you are using #GtkApplication, you don't have to call gtk_init()
* or gtk_init_check(); the #GtkApplication::startup handler
* does it for you.
*
* 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 (void)
{
if (!gtk_init_check ())
{
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 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 ();
}
gboolean
gtk_init_check_abi_check (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 ();
}
#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.");
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.
*
* Returns: (transfer none): 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" -->
* // computation going on...
*
* while (gtk_events_pending ())
* gtk_main_iteration ();
*
* // ...computation continued
* ]|
*
* 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;
}
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_TOUCHPAD_SWIPE:
rewrite_events_translate (event->any.window,
new_window,
&event->touchpad_swipe.x,
&event->touchpad_swipe.y);
break;
case GDK_TOUCHPAD_PINCH:
rewrite_events_translate (event->any.window,
new_window,
&event->touchpad_pinch.x,
&event->touchpad_pinch.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:
case GDK_TOUCHPAD_SWIPE:
case GDK_TOUCHPAD_PINCH:
display = gdk_window_get_display (event->any.window);
device = gdk_event_get_device (event);
if (!gdk_device_grab_info (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;
}
static GtkWidget *
widget_get_popover_ancestor (GtkWidget *widget,
GtkWindow *window)
{
GtkWidget *parent = gtk_widget_get_parent (widget);
while (parent && parent != GTK_WIDGET (window))
{
widget = parent;
parent = gtk_widget_get_parent (widget);
}
if (!parent || parent != GTK_WIDGET (window))
return NULL;
if (_gtk_window_is_popover_widget (GTK_WINDOW (window), widget))
return widget;
return NULL;
}
static gboolean
check_event_in_child_popover (GtkWidget *event_widget,
GtkWidget *grab_widget)
{
GtkWidget *window, *popover = NULL, *popover_parent = NULL;
if (grab_widget == event_widget)
return FALSE;
window = gtk_widget_get_ancestor (event_widget, GTK_TYPE_WINDOW);
if (!window)
return FALSE;
popover = widget_get_popover_ancestor (event_widget, GTK_WINDOW (window));
if (!popover)
return FALSE;
popover_parent = _gtk_window_get_popover_parent (GTK_WINDOW (window), popover);
if (!popover_parent)
return FALSE;
return (popover_parent == grab_widget || gtk_widget_is_ancestor (popover_parent, grab_widget));
}
static GdkNotifyType
get_virtual_notify_type (GdkNotifyType notify_type)
{
switch (notify_type)
{
case GDK_NOTIFY_ANCESTOR:
case GDK_NOTIFY_INFERIOR:
return GDK_NOTIFY_VIRTUAL;
case GDK_NOTIFY_NONLINEAR:
return GDK_NOTIFY_NONLINEAR_VIRTUAL;
default:
g_assert_not_reached ();
return GDK_NOTIFY_UNKNOWN;
}
}
static void
synth_crossing (GtkWidget *widget,
GtkWidget *toplevel,
gboolean enter,
GtkWidget *other_widget,
GdkEvent *source,
GdkNotifyType notify_type,
GdkCrossingMode crossing_mode)
{
GdkEvent *event;
gdouble x, y;
event = gdk_event_new (enter ? GDK_ENTER_NOTIFY : GDK_LEAVE_NOTIFY);
gdk_event_set_user_data (event, G_OBJECT (widget));
gdk_event_set_device (event, gdk_event_get_device (source));
gdk_event_set_source_device (event, gdk_event_get_source_device (source));
event->any.window = g_object_ref (gtk_widget_get_window (toplevel));
if (other_widget)
event->crossing.subwindow = g_object_ref (gtk_widget_get_window (other_widget));
if (enter)
gtk_widget_set_state_flags (widget, GTK_STATE_FLAG_PRELIGHT, FALSE);
else
gtk_widget_unset_state_flags (widget, GTK_STATE_FLAG_PRELIGHT);
gdk_event_get_coords (source, &x, &y);
event->crossing.x = x;
event->crossing.y = y;
event->crossing.mode = crossing_mode;
event->crossing.detail = notify_type;
gtk_widget_event (widget, event);
gdk_event_free (event);
}
static GtkWidget *
update_pointer_focus_state (GtkWindow *toplevel,
GdkEvent *event,
GtkWidget *new_target)
{
GtkWidget *old_target = NULL;
GdkEventSequence *sequence;
GdkDevice *device;
gdouble x, y;
device = gdk_event_get_device (event);
sequence = gdk_event_get_event_sequence (event);
old_target = gtk_window_lookup_pointer_focus_widget (toplevel, device, sequence);
if (old_target == new_target)
return old_target;
gdk_event_get_coords (event, &x, &y);
gtk_window_update_pointer_focus (toplevel, device, sequence,
new_target, x, y);
return old_target;
}
static void
gtk_synthesize_crossing_events (GtkWindow *toplevel,
GtkWidget *old_target,
GtkWidget *new_target,
GdkEvent *event,
GdkCrossingMode mode)
{
GtkWidget *ancestor = NULL, *widget;
GdkNotifyType enter_type, leave_type, notify_type;
if (old_target && new_target)
ancestor = gtk_widget_common_ancestor (old_target, new_target);
if (ancestor == old_target)
{
leave_type = GDK_NOTIFY_INFERIOR;
enter_type = GDK_NOTIFY_ANCESTOR;
}
else if (ancestor == new_target)
{
leave_type = GDK_NOTIFY_ANCESTOR;
enter_type = GDK_NOTIFY_INFERIOR;
}
else
enter_type = leave_type = GDK_NOTIFY_NONLINEAR;
if (old_target)
{
widget = old_target;
while (widget != ancestor)
{
notify_type = (widget == old_target) ?
leave_type : get_virtual_notify_type (leave_type);
synth_crossing (widget, GTK_WIDGET (toplevel), FALSE,
new_target, event, notify_type, mode);
widget = gtk_widget_get_parent (widget);
}
}
if (new_target)
{
GSList *widgets = NULL;
widget = new_target;
while (widget != ancestor)
{
widgets = g_slist_prepend (widgets, widget);
widget = gtk_widget_get_parent (widget);
}
while (widgets)
{
widget = widgets->data;
widgets = g_slist_delete_link (widgets, widgets);
notify_type = (widget == new_target) ?
enter_type : get_virtual_notify_type (enter_type);
synth_crossing (widget, GTK_WIDGET (toplevel), TRUE,
old_target, event, notify_type, mode);
}
}
}
static gboolean
is_pointing_event (GdkEvent *event)
{
switch (event->type)
{
case GDK_MOTION_NOTIFY:
case GDK_ENTER_NOTIFY:
case GDK_LEAVE_NOTIFY:
case GDK_BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
case GDK_SCROLL:
case GDK_TOUCH_BEGIN:
case GDK_TOUCH_UPDATE:
case GDK_TOUCH_END:
case GDK_TOUCH_CANCEL:
case GDK_TOUCHPAD_PINCH:
case GDK_TOUCHPAD_SWIPE:
return TRUE;
break;
default:
return FALSE;
}
}
static GtkWidget *
handle_pointing_event (GdkEvent *event)
{
GtkWidget *target = NULL, *old_target = NULL, *widget;
GtkWindow *toplevel;
GtkWidget *toplevel_widget;
GdkEventSequence *sequence;
GdkDevice *device;
gdouble x, y;
widget = gtk_get_event_widget (event);
device = gdk_event_get_device (event);
if (!device || !gdk_event_get_coords (event, &x, &y))
return widget;
toplevel_widget = gtk_widget_get_toplevel (widget);
if (!GTK_IS_WINDOW (toplevel_widget))
return widget;
toplevel = GTK_WINDOW (toplevel_widget);
sequence = gdk_event_get_event_sequence (event);
switch (event->type)
{
case GDK_LEAVE_NOTIFY:
if (event->crossing.mode == GDK_CROSSING_GRAB ||
event->crossing.mode == GDK_CROSSING_UNGRAB)
break;
case GDK_TOUCH_END:
case GDK_TOUCH_CANCEL:
old_target = update_pointer_focus_state (toplevel, event, NULL);
break;
case GDK_ENTER_NOTIFY:
if (event->crossing.mode == GDK_CROSSING_GRAB ||
event->crossing.mode == GDK_CROSSING_UNGRAB)
break;
case GDK_TOUCH_BEGIN:
case GDK_TOUCH_UPDATE:
case GDK_MOTION_NOTIFY:
target = _gtk_toplevel_pick (toplevel, x, y, NULL, NULL);
old_target = update_pointer_focus_state (toplevel, event, target);
if (event->type == GDK_MOTION_NOTIFY || event->type == GDK_ENTER_NOTIFY)
{
if (!gtk_window_lookup_pointer_focus_implicit_grab (toplevel, device,
sequence))
{
gtk_synthesize_crossing_events (toplevel, old_target, target,
event, GDK_CROSSING_NORMAL);
}
gtk_window_maybe_update_cursor (toplevel, NULL, device);
}
if (event->type == GDK_TOUCH_BEGIN)
gtk_window_set_pointer_focus_grab (toplevel, device, sequence, target);
/* Let it take the effective pointer focus anyway, as it may change due
* to implicit grabs.
*/
target = NULL;
break;
case GDK_BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
target = gtk_window_lookup_effective_pointer_focus_widget (toplevel,
device,
sequence);
gtk_window_set_pointer_focus_grab (toplevel, device, sequence,
event->type == GDK_BUTTON_PRESS ?
target : NULL);
if (event->type == GDK_BUTTON_RELEASE)
{
old_target = target;
target = _gtk_toplevel_pick (toplevel, x, y, NULL, NULL);
gtk_synthesize_crossing_events (toplevel, old_target, target, event,
GDK_CROSSING_UNGRAB);
gtk_window_maybe_update_cursor (toplevel, NULL, device);
}
break;
case GDK_SCROLL:
case GDK_TOUCHPAD_PINCH:
case GDK_TOUCHPAD_SWIPE:
break;
default:
g_assert_not_reached ();
}
if (!target)
target = gtk_window_lookup_effective_pointer_focus_widget (toplevel,
device,
sequence);
return target ? target : old_target;
}
/**
* 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.
*
* 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);
}
/* Push the event onto a stack of current events for
* gtk_current_event_get().
*/
current_events = g_list_prepend (current_events, event);
if (is_pointing_event (event))
event_widget = handle_pointing_event (event);
if (!event_widget)
goto cleanup;
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);
if (GTK_IS_WINDOW (event_widget) ||
(grab_widget && grab_widget != event_widget &&
!gtk_widget_is_ancestor (event_widget, grab_widget)))
{
/* Ignore event if we got a grab on another toplevel */
if (!grab_widget ||
gtk_widget_get_toplevel (event_widget) == gtk_widget_get_toplevel (grab_widget))
{
if (_gtk_window_check_handle_wm_event (event))
goto cleanup;
}
}
/* 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;
/* popovers are not really a "child" of their "parent" in the widget/window
* hierarchy sense, we however want to interact with popovers spawn by widgets
* within grab_widget. If this is the case, we let the event go through
* unaffected by the grab.
*/
if (check_event_in_child_popover (event_widget, grab_widget))
grab_widget = event_widget;
gdk_event_set_user_data (event, G_OBJECT (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))
goto cleanup;
/* 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_render (event_widget, event->any.window, event->expose.region);
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_KEY_PRESS:
case GDK_KEY_RELEASE:
/* 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_SCROLL:
case GDK_BUTTON_PRESS:
case GDK_2BUTTON_PRESS:
case GDK_3BUTTON_PRESS:
case GDK_TOUCH_BEGIN:
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:
case GDK_TOUCHPAD_SWIPE:
case GDK_TOUCHPAD_PINCH:
case GDK_PAD_BUTTON_PRESS:
case GDK_PAD_BUTTON_RELEASE:
case GDK_PAD_RING:
case GDK_PAD_STRIP:
case GDK_PAD_GROUP_MODE:
if (!_gtk_propagate_captured_event (grab_widget, event, topmost_widget))
gtk_propagate_event (grab_widget, event);
break;
case GDK_ENTER_NOTIFY:
case GDK_LEAVE_NOTIFY:
/* Crossing event propagation happens during picking */
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);
}
cleanup:
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 (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)
{
GtkWidget *p;
for (p = _gtk_widget_get_first_child (child);
p != NULL;
p = _gtk_widget_get_next_sibling (p))
{
gtk_grab_notify_foreach (p, 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.
*
* Returns: (transfer none) (nullable): 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_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.
*
* Returns: (transfer full) (nullable): 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.
*
* Returns: 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.
*
* Returns: %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) (nullable): 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.
*
* Returns: (transfer none) (nullable): the widget that originally
* received @event, or %NULL
*/
GtkWidget*
gtk_get_event_widget (const 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;
}
/**
* gtk_get_event_target:
* @event: a #GdkEvent
*
* If @event is %NULL or the event was not associated with any widget,
* returns %NULL, otherwise returns the widget that is the deepmost
* receiver of the event.
*
* Returns: (transfer none) (nullable): the target widget, or %NULL
*
* Since: 3.92
*/
GtkWidget *
gtk_get_event_target (const GdkEvent *event)
{
return GTK_WIDGET (gdk_event_get_user_data (event));
}
/**
* gtk_get_event_target_with_type:
* @event: a #GdkEvent
* @type: the type to look for
*
* If @event is %NULL or the event was not associated with any widget,
* returns %NULL, otherwise returns first widget found from the event
* target to the toplevel that matches @type.
*
* Returns: (transfer none) (nullable): the widget in the target stack
* with the given type, or %NULL
*
* Since: 3.92
*/
GtkWidget *
gtk_get_event_target_with_type (GdkEvent *event,
GType type)
{
GtkWidget *target;
target = gtk_get_event_target (event);
while (target && !g_type_is_a (G_OBJECT_TYPE (target), type))
target = gtk_widget_get_parent (target);
return target;
}
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 = l->next)
{
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, const 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 &&
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
* 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);
}
GtkWidget *
_gtk_toplevel_pick (GtkWindow *toplevel,
gdouble x,
gdouble y,
gdouble *x_out,
gdouble *y_out)
{
GtkWidget *target = NULL, *widget = GTK_WIDGET (toplevel);
while (widget)
{
target = widget;
widget = GTK_WIDGET_GET_CLASS (target)->pick (widget, x, y, &x, &y);
}
if (x_out)
*x_out = x;
if (y_out)
*y_out = y;
return target;
}
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