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gtk/gdk/gdk.c

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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 <string.h>
#include <stdlib.h>
#include "gdk.h"
#include "gdkinternals.h"
#include "gdkintl.h"
#ifndef HAVE_XCONVERTCASE
#include "gdkkeysyms.h"
#endif
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},
{"colormap", GDK_DEBUG_COLORMAP},
{"pixmap", GDK_DEBUG_PIXMAP},
{"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 const int gdk_ndebug_keys = G_N_ELEMENTS (gdk_debug_keys);
#endif /* G_ENABLE_DEBUG */
#ifdef G_ENABLE_DEBUG
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,
gdk_ndebug_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,
gdk_ndebug_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") },
{ "screen", 0, 0, G_OPTION_ARG_INT, &_gdk_screen_number,
/* Description of --screen=SCREEN in --help output */ N_("X screen to use"),
/* Placeholder in --screen=SCREEN in --help output */ N_("SCREEN") },
#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);
g_option_group_add_entries (group, _gdk_windowing_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,
gdk_ndebug_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_windowing_init ();
}
/**
* gdk_parse_args:
* @argc: the number of command line arguments.
* @argv: 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);
g_option_group_add_entries (option_group, _gdk_windowing_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)
{
if (_gdk_screen_number >= 0)
_gdk_display_arg_name = _gdk_windowing_substitute_screen_number (_gdk_display_name, _gdk_screen_number);
else
_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: 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 ());
if (!display && _gdk_screen_number >= 0)
{
g_free (_gdk_display_arg_name);
_gdk_display_arg_name = g_strdup (_gdk_display_name);
display = gdk_display_open (_gdk_display_name);
}
if (display)
gdk_display_manager_set_default_display (gdk_display_manager_get (),
display);
return display;
}
/**
* gdk_init_check:
* @argc: (inout):
* @argv: (array length=argc) (inout):
*
* Initialize the library for use.
*
* Arguments:
* "argc" is the number of arguments.
* "argv" is an array of strings.
*
* Results:
* "argc" and "argv" are modified to reflect any arguments
* which were not handled. (Such arguments should either
* be handled by the application or dismissed). If initialization
* fails, returns FALSE, otherwise TRUE.
*
* Side effects:
* The library is initialized.
*
*--------------------------------------------------------------
*/
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):
* @argv: (array length=argc) (inout):
*/
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);
}
}
void
gdk_threads_enter (void)
{
if (gdk_threads_lock)
(*gdk_threads_lock) ();
}
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:
* @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 btweeen #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
*/
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:
* @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
*/
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:
* @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_timout_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
*/
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:
* @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);
}
G_CONST_RETURN char *
gdk_get_program_class (void)
{
return gdk_progclass;
}
void
gdk_set_program_class (const char *program_class)
{
g_free (gdk_progclass);
gdk_progclass = g_strdup (program_class);
}
/**
* gdk_enable_multidevice:
*
* Enables 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.
*
* Note that individual #GdkWindow<!-- -->s still need to explicitly
* enable multidevice awareness through gdk_window_set_support_multidevice().
*
* This function must be called before initializing GDK.
*
* Since: 3.0
**/
void
gdk_enable_multidevice (void)
{
if (gdk_initialized)
return;
_gdk_enable_multidevice = TRUE;
}
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