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gtk2/gdk/gdk.c
Matthias Clasen 1f4bb70bac Give the GDK docs some love 
Reorganize some sections, drop the largely redundant multihead
section, add some more information about multiple backends.
2011-02-09 01:32:24 -05:00

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/* GDK - The GIMP Drawing Kit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#include "gdkmain.h"
#include "gdkinternals.h"
#include "gdkintl.h"
#ifndef HAVE_XCONVERTCASE
#include "gdkkeysyms.h"
#endif
#include <string.h>
#include <stdlib.h>
/**
* SECTION:general
* @Short_description: Library initialization and miscellaneous functions
* @Title: General
*
* This section describes the GDK initialization functions and miscellaneous
* utility functions.
*/
/**
* GDK_WINDOWING_X11:
*
* The #GDK_WINDOWING_X11 macro is defined if the X11 backend
* is supported.
*
* Use this macro to guard code that is specific to the X11 backend.
*/
/**
* GDK_WINDOWING_WIN32:
*
* The #GDK_WINDOWING_WIN32 macro is defined if the Win32 backend
* is supported.
*
* Use this macro to guard code that is specific to the Win32 backend.
*/
/**
* GDK_WINDOWING_QUARTZ:
*
* The #GDK_WINDOWING_QUARTZ macro is defined if the Quartz backend
* is supported.
*
* Use this macro to guard code that is specific to the Quartz backend.
*/
typedef struct _GdkPredicate GdkPredicate;
struct _GdkPredicate
{
GdkEventFunc func;
gpointer data;
};
typedef struct _GdkThreadsDispatch GdkThreadsDispatch;
struct _GdkThreadsDispatch
{
GSourceFunc func;
gpointer data;
GDestroyNotify destroy;
};
/* Private variable declarations
*/
static int gdk_initialized = 0; /* 1 if the library is initialized,
* 0 otherwise.
*/
static gchar *gdk_progclass = NULL;
static GMutex *gdk_threads_mutex = NULL; /* Global GDK lock */
static GCallback gdk_threads_lock = NULL;
static GCallback gdk_threads_unlock = NULL;
#ifdef G_ENABLE_DEBUG
static const GDebugKey gdk_debug_keys[] = {
{"events", GDK_DEBUG_EVENTS},
{"misc", GDK_DEBUG_MISC},
{"dnd", GDK_DEBUG_DND},
{"xim", GDK_DEBUG_XIM},
{"nograbs", GDK_DEBUG_NOGRABS},
{"input", GDK_DEBUG_INPUT},
{"cursor", GDK_DEBUG_CURSOR},
{"multihead", GDK_DEBUG_MULTIHEAD},
{"xinerama", GDK_DEBUG_XINERAMA},
{"draw", GDK_DEBUG_DRAW},
{"eventloop", GDK_DEBUG_EVENTLOOP}
};
static gboolean
gdk_arg_debug_cb (const char *key, const char *value, gpointer user_data, GError **error)
{
guint debug_value = g_parse_debug_string (value,
(GDebugKey *) gdk_debug_keys,
G_N_ELEMENTS (gdk_debug_keys));
if (debug_value == 0 && value != NULL && strcmp (value, "") != 0)
{
g_set_error (error,
G_OPTION_ERROR, G_OPTION_ERROR_FAILED,
_("Error parsing option --gdk-debug"));
return FALSE;
}
_gdk_debug_flags |= debug_value;
return TRUE;
}
static gboolean
gdk_arg_no_debug_cb (const char *key, const char *value, gpointer user_data, GError **error)
{
guint debug_value = g_parse_debug_string (value,
(GDebugKey *) gdk_debug_keys,
G_N_ELEMENTS (gdk_debug_keys));
if (debug_value == 0 && value != NULL && strcmp (value, "") != 0)
{
g_set_error (error,
G_OPTION_ERROR, G_OPTION_ERROR_FAILED,
_("Error parsing option --gdk-no-debug"));
return FALSE;
}
_gdk_debug_flags &= ~debug_value;
return TRUE;
}
#endif /* G_ENABLE_DEBUG */
static gboolean
gdk_arg_class_cb (const char *key, const char *value, gpointer user_data, GError **error)
{
gdk_set_program_class (value);
return TRUE;
}
static gboolean
gdk_arg_name_cb (const char *key, const char *value, gpointer user_data, GError **error)
{
g_set_prgname (value);
return TRUE;
}
static const GOptionEntry gdk_args[] = {
{ "class", 0, 0, G_OPTION_ARG_CALLBACK, gdk_arg_class_cb,
/* Description of --class=CLASS in --help output */ N_("Program class as used by the window manager"),
/* Placeholder in --class=CLASS in --help output */ N_("CLASS") },
{ "name", 0, 0, G_OPTION_ARG_CALLBACK, gdk_arg_name_cb,
/* Description of --name=NAME in --help output */ N_("Program name as used by the window manager"),
/* Placeholder in --name=NAME in --help output */ N_("NAME") },
{ "display", 0, G_OPTION_FLAG_IN_MAIN, G_OPTION_ARG_STRING, &_gdk_display_name,
/* Description of --display=DISPLAY in --help output */ N_("X display to use"),
/* Placeholder in --display=DISPLAY in --help output */ N_("DISPLAY") },
#ifdef G_ENABLE_DEBUG
{ "gdk-debug", 0, 0, G_OPTION_ARG_CALLBACK, gdk_arg_debug_cb,
/* Description of --gdk-debug=FLAGS in --help output */ N_("GDK debugging flags to set"),
/* Placeholder in --gdk-debug=FLAGS in --help output */ N_("FLAGS") },
{ "gdk-no-debug", 0, 0, G_OPTION_ARG_CALLBACK, gdk_arg_no_debug_cb,
/* Description of --gdk-no-debug=FLAGS in --help output */ N_("GDK debugging flags to unset"),
/* Placeholder in --gdk-no-debug=FLAGS in --help output */ N_("FLAGS") },
#endif
{ NULL }
};
/**
* gdk_add_option_entries_libgtk_only:
* @group: An option group.
*
* Appends gdk option entries to the passed in option group. This is
* not public API and must not be used by applications.
*/
void
gdk_add_option_entries_libgtk_only (GOptionGroup *group)
{
g_option_group_add_entries (group, gdk_args);
}
void
gdk_pre_parse_libgtk_only (void)
{
gdk_initialized = TRUE;
/* We set the fallback program class here, rather than lazily in
* gdk_get_program_class, since we don't want -name to override it.
*/
gdk_progclass = g_strdup (g_get_prgname ());
if (gdk_progclass && gdk_progclass[0])
gdk_progclass[0] = g_ascii_toupper (gdk_progclass[0]);
#ifdef G_ENABLE_DEBUG
{
gchar *debug_string = getenv("GDK_DEBUG");
if (debug_string != NULL)
_gdk_debug_flags = g_parse_debug_string (debug_string,
(GDebugKey *) gdk_debug_keys,
G_N_ELEMENTS (gdk_debug_keys));
}
#endif /* G_ENABLE_DEBUG */
if (getenv ("GDK_NATIVE_WINDOWS"))
{
_gdk_native_windows = TRUE;
/* Ensure that this is not propagated to spawned applications */
g_unsetenv ("GDK_NATIVE_WINDOWS");
}
g_type_init ();
/* Do any setup particular to the windowing system */
gdk_display_manager_get ();
}
/**
* gdk_parse_args:
* @argc: the number of command line arguments.
* @argv: (inout) (array length=argc): the array of command line arguments.
*
* Parse command line arguments, and store for future
* use by calls to gdk_display_open().
*
* Any arguments used by GDK are removed from the array and @argc and @argv are
* updated accordingly.
*
* You shouldn't call this function explicitely if you are using
* gtk_init(), gtk_init_check(), gdk_init(), or gdk_init_check().
*
* Since: 2.2
**/
void
gdk_parse_args (int *argc,
char ***argv)
{
GOptionContext *option_context;
GOptionGroup *option_group;
GError *error = NULL;
if (gdk_initialized)
return;
gdk_pre_parse_libgtk_only ();
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);
option_group = g_option_group_new (NULL, NULL, NULL, NULL, NULL);
g_option_context_set_main_group (option_context, option_group);
g_option_group_add_entries (option_group, gdk_args);
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);
GDK_NOTE (MISC, g_message ("progname: \"%s\"", g_get_prgname ()));
}
/**
* gdk_get_display_arg_name:
*
* Gets the display name specified in the command line arguments passed
* to gdk_init() or gdk_parse_args(), if any.
*
* Returns: the display name, if specified explicitely, otherwise %NULL
* this string is owned by GTK+ and must not be modified or freed.
*
* Since: 2.2
*/
G_CONST_RETURN gchar *
gdk_get_display_arg_name (void)
{
if (!_gdk_display_arg_name)
_gdk_display_arg_name = g_strdup (_gdk_display_name);
return _gdk_display_arg_name;
}
/**
* gdk_display_open_default_libgtk_only:
*
* Opens the default display specified by command line arguments or
* environment variables, sets it as the default display, and returns
* it. gdk_parse_args must have been called first. If the default
* display has previously been set, simply returns that. An internal
* function that should not be used by applications.
*
* Return value: (transfer none): the default display, if it could be
* opened, otherwise %NULL.
**/
GdkDisplay *
gdk_display_open_default_libgtk_only (void)
{
GdkDisplay *display;
g_return_val_if_fail (gdk_initialized, NULL);
display = gdk_display_get_default ();
if (display)
return display;
display = gdk_display_open (gdk_get_display_arg_name ());
return display;
}
/**
* gdk_init_check:
* @argc: (inout): the number of command line arguments.
* @argv: (array length=argc) (inout): the array of command line arguments.
*
* Initializes the GDK library and connects to the windowing system,
* returning %TRUE on success.
*
* Any arguments used by GDK are removed from the array and @argc and @argv
* are updated accordingly.
*
* GTK+ initializes GDK in gtk_init() and so this function is not usually
* needed by GTK+ applications.
*
* Returns: %TRUE if initialization succeeded.
*/
gboolean
gdk_init_check (int *argc,
char ***argv)
{
gdk_parse_args (argc, argv);
return gdk_display_open_default_libgtk_only () != NULL;
}
/**
* gdk_init:
* @argc: (inout): the number of command line arguments.
* @argv: (array length=argc) (inout): the array of command line arguments.
*
* Initializes the GDK library and connects to the windowing system.
* If initialization fails, a warning message is output and the application
* terminates with a call to <literal>exit(1)</literal>.
*
* Any arguments used by GDK are removed from the array and @argc and @argv
* are updated accordingly.
*
* GTK+ initializes GDK in gtk_init() and so this function is not usually
* needed by GTK+ applications.
*/
void
gdk_init (int *argc, char ***argv)
{
if (!gdk_init_check (argc, argv))
{
const char *display_name = gdk_get_display_arg_name ();
g_warning ("cannot open display: %s", display_name ? display_name : "");
exit(1);
}
}
/**
* SECTION:threads
* @Short_description: Functions for using GDK in multi-threaded programs
* @Title: Threads
*
* For thread safety, GDK relies on the thread primitives in GLib,
* and on the thread-safe GLib main loop.
*
* GLib is completely thread safe (all global data is automatically
* locked), but individual data structure instances are not automatically
* locked for performance reasons. So e.g. you must coordinate
* accesses to the same #GHashTable from multiple threads.
*
* GTK+ is "thread aware" but not thread safe &mdash; it provides a
* global lock controlled by gdk_threads_enter()/gdk_threads_leave()
* which protects all use of GTK+. That is, only one thread can use GTK+
* at any given time.
*
* Unfortunately the above holds with the X11 backend only. With the
* Win32 backend, GDK calls should not be attempted from multiple threads
* at all.
*
* You must call g_thread_init() and gdk_threads_init() before executing
* any other GTK+ or GDK functions in a threaded GTK+ program.
*
* Idles, timeouts, and input functions from GLib, such as g_idle_add(), are
* executed outside of the main GTK+ lock.
* So, if you need to call GTK+ inside of such a callback, you must surround
* the callback with a gdk_threads_enter()/gdk_threads_leave() pair or use
* gdk_threads_add_idle_full() which does this for you.
* However, event dispatching from the mainloop is still executed within
* the main GTK+ lock, so callback functions connected to event signals
* like #GtkWidget::button-press-event, do not need thread protection.
*
* In particular, this means, if you are writing widgets that might
* be used in threaded programs, you <emphasis>must</emphasis> surround
* timeouts and idle functions in this matter.
*
* As always, you must also surround any calls to GTK+ not made within
* a signal handler with a gdk_threads_enter()/gdk_threads_leave() pair.
*
* Before calling gdk_threads_leave() from a thread other
* than your main thread, you probably want to call gdk_flush()
* to send all pending commands to the windowing system.
* (The reason you don't need to do this from the main thread
* is that GDK always automatically flushes pending commands
* when it runs out of incoming events to process and has
* to sleep while waiting for more events.)
*
* A minimal main program for a threaded GTK+ application
* looks like:
* <informalexample>
* <programlisting role="C">
* int
* main (int argc, char *argv[])
* {
* GtkWidget *window;
*
* g_thread_init (NULL);
* gdk_threads_init (<!-- -->);
* gdk_threads_enter (<!-- -->);
*
* gtk_init (&argc, &argv);
*
* window = create_window (<!-- -->);
* gtk_widget_show (window);
*
* gtk_main (<!-- -->);
* gdk_threads_leave (<!-- -->);
*
* return 0;
* }
* </programlisting>
* </informalexample>
*
* Callbacks require a bit of attention. Callbacks from GTK+ signals
* are made within the GTK+ lock. However callbacks from GLib (timeouts,
* IO callbacks, and idle functions) are made outside of the GTK+
* lock. So, within a signal handler you do not need to call
* gdk_threads_enter(), but within the other types of callbacks, you
* do.
*
* Erik Mouw contributed the following code example to
* illustrate how to use threads within GTK+ programs.
* <informalexample>
* <programlisting role="C">
* /<!---->*-------------------------------------------------------------------------
* * Filename: gtk-thread.c
* * Version: 0.99.1
* * Copyright: Copyright (C) 1999, Erik Mouw
* * Author: Erik Mouw &lt;J.A.K.Mouw@its.tudelft.nl&gt;
* * Description: GTK threads example.
* * Created at: Sun Oct 17 21:27:09 1999
* * Modified by: Erik Mouw &lt;J.A.K.Mouw@its.tudelft.nl&gt;
* * Modified at: Sun Oct 24 17:21:41 1999
* *-----------------------------------------------------------------------*<!---->/
* /<!---->*
* * Compile with:
* *
* * cc -o gtk-thread gtk-thread.c `gtk-config --cflags --libs gthread`
* *
* * Thanks to Sebastian Wilhelmi and Owen Taylor for pointing out some
* * bugs.
* *
* *<!---->/
*
* #include <stdio.h>
* #include <stdlib.h>
* #include <unistd.h>
* #include <time.h>
* #include <gtk/gtk.h>
* #include <glib.h>
* #include <pthread.h>
*
* #define YES_IT_IS (1)
* #define NO_IT_IS_NOT (0)
*
* typedef struct
* {
* GtkWidget *label;
* int what;
* } yes_or_no_args;
*
* G_LOCK_DEFINE_STATIC (yes_or_no);
* static volatile int yes_or_no = YES_IT_IS;
*
* void destroy (GtkWidget *widget, gpointer data)
* {
* gtk_main_quit (<!-- -->);
* }
*
* void *argument_thread (void *args)
* {
* yes_or_no_args *data = (yes_or_no_args *)args;
* gboolean say_something;
*
* for (;;)
* {
* /<!---->* sleep a while *<!---->/
* sleep(rand(<!-- -->) / (RAND_MAX / 3) + 1);
*
* /<!---->* lock the yes_or_no_variable *<!---->/
* G_LOCK(yes_or_no);
*
* /<!---->* do we have to say something? *<!---->/
* say_something = (yes_or_no != data->what);
*
* if(say_something)
* {
* /<!---->* set the variable *<!---->/
* yes_or_no = data->what;
* }
*
* /<!---->* Unlock the yes_or_no variable *<!---->/
* G_UNLOCK (yes_or_no);
*
* if (say_something)
* {
* /<!---->* get GTK thread lock *<!---->/
* gdk_threads_enter (<!-- -->);
*
* /<!---->* set label text *<!---->/
* if(data->what == YES_IT_IS)
* gtk_label_set_text (GTK_LABEL (data->label), "O yes, it is!");
* else
* gtk_label_set_text (GTK_LABEL (data->label), "O no, it isn't!");
*
* /<!---->* release GTK thread lock *<!---->/
* gdk_threads_leave (<!-- -->);
* }
* }
*
* return NULL;
* }
*
* int main (int argc, char *argv[])
* {
* GtkWidget *window;
* GtkWidget *label;
* yes_or_no_args yes_args, no_args;
* pthread_t no_tid, yes_tid;
*
* /<!---->* init threads *<!---->/
* g_thread_init (NULL);
* gdk_threads_init (<!-- -->);
* gdk_threads_enter (<!-- -->);
*
* /<!---->* init gtk *<!---->/
* gtk_init(&argc, &argv);
*
* /<!---->* init random number generator *<!---->/
* srand ((unsigned int) time (NULL));
*
* /<!---->* create a window *<!---->/
* window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
*
* g_signal_connect (window, "destroy", G_CALLBACK (destroy), NULL);
*
* gtk_container_set_border_width (GTK_CONTAINER (window), 10);
*
* /<!---->* create a label *<!---->/
* label = gtk_label_new ("And now for something completely different ...");
* gtk_container_add (GTK_CONTAINER (window), label);
*
* /<!---->* show everything *<!---->/
* gtk_widget_show (label);
* gtk_widget_show (window);
*
* /<!---->* create the threads *<!---->/
* yes_args.label = label;
* yes_args.what = YES_IT_IS;
* pthread_create (&yes_tid, NULL, argument_thread, &yes_args);
*
* no_args.label = label;
* no_args.what = NO_IT_IS_NOT;
* pthread_create (&no_tid, NULL, argument_thread, &no_args);
*
* /<!---->* enter the GTK main loop *<!---->/
* gtk_main (<!-- -->);
* gdk_threads_leave (<!-- -->);
*
* return 0;
* }
* </programlisting>
* </informalexample>
*/
/**
* gdk_threads_enter:
*
* This macro marks the beginning of a critical section in which GDK and
* GTK+ functions can be called safely and without causing race
* conditions. Only one thread at a time can be in such a critial
* section.
*/
void
gdk_threads_enter (void)
{
if (gdk_threads_lock)
(*gdk_threads_lock) ();
}
/**
* gdk_threads_leave:
*
* Leaves a critical region begun with gdk_threads_enter().
*/
void
gdk_threads_leave (void)
{
if (gdk_threads_unlock)
(*gdk_threads_unlock) ();
}
static void
gdk_threads_impl_lock (void)
{
if (gdk_threads_mutex)
g_mutex_lock (gdk_threads_mutex);
}
static void
gdk_threads_impl_unlock (void)
{
if (gdk_threads_mutex)
g_mutex_unlock (gdk_threads_mutex);
}
/**
* gdk_threads_init:
*
* Initializes GDK so that it can be used from multiple threads
* in conjunction with gdk_threads_enter() and gdk_threads_leave().
* g_thread_init() must be called previous to this function.
*
* This call must be made before any use of the main loop from
* GTK+; to be safe, call it before gtk_init().
**/
void
gdk_threads_init (void)
{
if (!g_thread_supported ())
g_error ("g_thread_init() must be called before gdk_threads_init()");
gdk_threads_mutex = g_mutex_new ();
if (!gdk_threads_lock)
gdk_threads_lock = gdk_threads_impl_lock;
if (!gdk_threads_unlock)
gdk_threads_unlock = gdk_threads_impl_unlock;
}
/**
* gdk_threads_set_lock_functions: (skip)
* @enter_fn: function called to guard GDK
* @leave_fn: function called to release the guard
*
* Allows the application to replace the standard method that
* GDK uses to protect its data structures. Normally, GDK
* creates a single #GMutex that is locked by gdk_threads_enter(),
* and released by gdk_threads_leave(); using this function an
* application provides, instead, a function @enter_fn that is
* called by gdk_threads_enter() and a function @leave_fn that is
* called by gdk_threads_leave().
*
* The functions must provide at least same locking functionality
* as the default implementation, but can also do extra application
* specific processing.
*
* As an example, consider an application that has its own recursive
* lock that when held, holds the GTK+ lock as well. When GTK+ unlocks
* the GTK+ lock when entering a recursive main loop, the application
* must temporarily release its lock as well.
*
* Most threaded GTK+ apps won't need to use this method.
*
* This method must be called before gdk_threads_init(), and cannot
* be called multiple times.
*
* Since: 2.4
**/
void
gdk_threads_set_lock_functions (GCallback enter_fn,
GCallback leave_fn)
{
g_return_if_fail (gdk_threads_lock == NULL &&
gdk_threads_unlock == NULL);
gdk_threads_lock = enter_fn;
gdk_threads_unlock = leave_fn;
}
static gboolean
gdk_threads_dispatch (gpointer data)
{
GdkThreadsDispatch *dispatch = data;
gboolean ret = FALSE;
GDK_THREADS_ENTER ();
if (!g_source_is_destroyed (g_main_current_source ()))
ret = dispatch->func (dispatch->data);
GDK_THREADS_LEAVE ();
return ret;
}
static void
gdk_threads_dispatch_free (gpointer data)
{
GdkThreadsDispatch *dispatch = data;
if (dispatch->destroy && dispatch->data)
dispatch->destroy (dispatch->data);
g_slice_free (GdkThreadsDispatch, data);
}
/**
* gdk_threads_add_idle_full:
* @priority: the priority of the idle source. Typically this will be in the
* range between #G_PRIORITY_DEFAULT_IDLE and #G_PRIORITY_HIGH_IDLE
* @function: function to call
* @data: data to pass to @function
* @notify: (allow-none): function to call when the idle is removed, or %NULL
*
* Adds a function to be called whenever there are no higher priority
* events pending. If the function returns %FALSE it is automatically
* removed from the list of event sources and will not be called again.
*
* This variant of g_idle_add_full() calls @function with the GDK lock
* held. It can be thought of a MT-safe version for GTK+ widgets for the
* following use case, where you have to worry about idle_callback()
* running in thread A and accessing @self after it has been finalized
* in thread B:
*
* |[
* static gboolean
* idle_callback (gpointer data)
* {
* /&ast; gdk_threads_enter(); would be needed for g_idle_add() &ast;/
*
* SomeWidget *self = data;
* /&ast; do stuff with self &ast;/
*
* self->idle_id = 0;
*
* /&ast; gdk_threads_leave(); would be needed for g_idle_add() &ast;/
* return FALSE;
* }
*
* static void
* some_widget_do_stuff_later (SomeWidget *self)
* {
* self->idle_id = gdk_threads_add_idle (idle_callback, self)
* /&ast; using g_idle_add() here would require thread protection in the callback &ast;/
* }
*
* static void
* some_widget_finalize (GObject *object)
* {
* SomeWidget *self = SOME_WIDGET (object);
* if (self->idle_id)
* g_source_remove (self->idle_id);
* G_OBJECT_CLASS (parent_class)->finalize (object);
* }
* ]|
*
* Return value: the ID (greater than 0) of the event source.
*
* Since: 2.12
* Rename to: gdk_threads_add_idle
*/
guint
gdk_threads_add_idle_full (gint priority,
GSourceFunc function,
gpointer data,
GDestroyNotify notify)
{
GdkThreadsDispatch *dispatch;
g_return_val_if_fail (function != NULL, 0);
dispatch = g_slice_new (GdkThreadsDispatch);
dispatch->func = function;
dispatch->data = data;
dispatch->destroy = notify;
return g_idle_add_full (priority,
gdk_threads_dispatch,
dispatch,
gdk_threads_dispatch_free);
}
/**
* gdk_threads_add_idle: (skip)
* @function: function to call
* @data: data to pass to @function
*
* A wrapper for the common usage of gdk_threads_add_idle_full()
* assigning the default priority, #G_PRIORITY_DEFAULT_IDLE.
*
* See gdk_threads_add_idle_full().
*
* Return value: the ID (greater than 0) of the event source.
*
* Since: 2.12
*/
guint
gdk_threads_add_idle (GSourceFunc function,
gpointer data)
{
return gdk_threads_add_idle_full (G_PRIORITY_DEFAULT_IDLE,
function, data, NULL);
}
/**
* gdk_threads_add_timeout_full:
* @priority: the priority of the timeout source. Typically this will be in the
* range between #G_PRIORITY_DEFAULT_IDLE and #G_PRIORITY_HIGH_IDLE.
* @interval: the time between calls to the function, in milliseconds
* (1/1000ths of a second)
* @function: function to call
* @data: data to pass to @function
* @notify: (allow-none): function to call when the timeout is removed, or %NULL
*
* Sets a function to be called at regular intervals holding the GDK lock,
* with the given priority. The function is called repeatedly until it
* returns %FALSE, at which point the timeout is automatically destroyed
* and the function will not be called again. The @notify function is
* called when the timeout is destroyed. The first call to the
* function will be at the end of the first @interval.
*
* Note that timeout functions may be delayed, due to the processing of other
* event sources. Thus they should not be relied on for precise timing.
* After each call to the timeout function, the time of the next
* timeout is recalculated based on the current time and the given interval
* (it does not try to 'catch up' time lost in delays).
*
* This variant of g_timeout_add_full() can be thought of a MT-safe version
* for GTK+ widgets for the following use case:
*
* |[
* static gboolean timeout_callback (gpointer data)
* {
* SomeWidget *self = data;
*
* /&ast; do stuff with self &ast;/
*
* self->timeout_id = 0;
*
* return FALSE;
* }
*
* static void some_widget_do_stuff_later (SomeWidget *self)
* {
* self->timeout_id = g_timeout_add (timeout_callback, self)
* }
*
* static void some_widget_finalize (GObject *object)
* {
* SomeWidget *self = SOME_WIDGET (object);
*
* if (self->timeout_id)
* g_source_remove (self->timeout_id);
*
* G_OBJECT_CLASS (parent_class)->finalize (object);
* }
* ]|
*
* Return value: the ID (greater than 0) of the event source.
*
* Since: 2.12
* Rename to: gdk_threads_add_timeout
*/
guint
gdk_threads_add_timeout_full (gint priority,
guint interval,
GSourceFunc function,
gpointer data,
GDestroyNotify notify)
{
GdkThreadsDispatch *dispatch;
g_return_val_if_fail (function != NULL, 0);
dispatch = g_slice_new (GdkThreadsDispatch);
dispatch->func = function;
dispatch->data = data;
dispatch->destroy = notify;
return g_timeout_add_full (priority,
interval,
gdk_threads_dispatch,
dispatch,
gdk_threads_dispatch_free);
}
/**
* gdk_threads_add_timeout: (skip)
* @interval: the time between calls to the function, in milliseconds
* (1/1000ths of a second)
* @function: function to call
* @data: data to pass to @function
*
* A wrapper for the common usage of gdk_threads_add_timeout_full()
* assigning the default priority, #G_PRIORITY_DEFAULT.
*
* See gdk_threads_add_timeout_full().
*
* Return value: the ID (greater than 0) of the event source.
*
* Since: 2.12
*/
guint
gdk_threads_add_timeout (guint interval,
GSourceFunc function,
gpointer data)
{
return gdk_threads_add_timeout_full (G_PRIORITY_DEFAULT,
interval, function, data, NULL);
}
/**
* gdk_threads_add_timeout_seconds_full:
* @priority: the priority of the timeout source. Typically this will be in the
* range between #G_PRIORITY_DEFAULT_IDLE and #G_PRIORITY_HIGH_IDLE.
* @interval: the time between calls to the function, in seconds
* @function: function to call
* @data: data to pass to @function
* @notify: (allow-none): function to call when the timeout is removed, or %NULL
*
* A variant of gdk_threads_add_timeout_full() with second-granularity.
* See g_timeout_add_seconds_full() for a discussion of why it is
* a good idea to use this function if you don't need finer granularity.
*
* Return value: the ID (greater than 0) of the event source.
*
* Since: 2.14
* Rename to: gdk_threads_add_timeout_seconds
*/
guint
gdk_threads_add_timeout_seconds_full (gint priority,
guint interval,
GSourceFunc function,
gpointer data,
GDestroyNotify notify)
{
GdkThreadsDispatch *dispatch;
g_return_val_if_fail (function != NULL, 0);
dispatch = g_slice_new (GdkThreadsDispatch);
dispatch->func = function;
dispatch->data = data;
dispatch->destroy = notify;
return g_timeout_add_seconds_full (priority,
interval,
gdk_threads_dispatch,
dispatch,
gdk_threads_dispatch_free);
}
/**
* gdk_threads_add_timeout_seconds: (skip)
* @interval: the time between calls to the function, in seconds
* @function: function to call
* @data: data to pass to @function
*
* A wrapper for the common usage of gdk_threads_add_timeout_seconds_full()
* assigning the default priority, #G_PRIORITY_DEFAULT.
*
* For details, see gdk_threads_add_timeout_full().
*
* Return value: the ID (greater than 0) of the event source.
*
* Since: 2.14
*/
guint
gdk_threads_add_timeout_seconds (guint interval,
GSourceFunc function,
gpointer data)
{
return gdk_threads_add_timeout_seconds_full (G_PRIORITY_DEFAULT,
interval, function, data, NULL);
}
/**
* gdk_get_program_class:
*
* Gets the program class. Unless the program class has explicitly
* been set with gdk_set_program_class() or with the <option>--class</option>
* commandline option, the default value is the program name (determined
* with g_get_prgname()) with the first character converted to uppercase.
*
* Returns: the program class.
*/
G_CONST_RETURN char *
gdk_get_program_class (void)
{
return gdk_progclass;
}
/**
* gdk_set_program_class:
* @program_class: a string.
*
* Sets the program class. The X11 backend uses the program class to set
* the class name part of the <literal>WM_CLASS</literal> property on
* toplevel windows; see the ICCCM.
*/
void
gdk_set_program_class (const char *program_class)
{
g_free (gdk_progclass);
gdk_progclass = g_strdup (program_class);
}
/**
* gdk_disable_multidevice:
*
* Disables multidevice support in GDK. This call must happen prior
* to gdk_display_open(), gtk_init(), gtk_init_with_args() or
* gtk_init_check() in order to take effect.
*
* Most common GTK+ applications won't ever need to call this. Only
* applications that do mixed GDK/Xlib calls could want to disable
* multidevice support if such Xlib code deals with input devices in
* any way and doesn't observe the presence of XInput 2.
*
* Since: 3.0
*/
void
gdk_disable_multidevice (void)
{
if (gdk_initialized)
return;
_gdk_disable_multidevice = TRUE;
}
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