mirror of
https://gitlab.gnome.org/GNOME/glib.git
synced 2024-12-26 07:26:15 +01:00
673 lines
26 KiB
C
673 lines
26 KiB
C
/* GObject - GLib Type, Object, Parameter and Signal Library
|
||
* Copyright (C) 2000-2001 Red Hat, Inc.
|
||
*
|
||
* SPDX-License-Identifier: LGPL-2.1-or-later
|
||
*
|
||
* 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 2.1 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/>.
|
||
*/
|
||
#ifndef __G_SIGNAL_H__
|
||
#define __G_SIGNAL_H__
|
||
|
||
#if !defined (__GLIB_GOBJECT_H_INSIDE__) && !defined (GOBJECT_COMPILATION)
|
||
#error "Only <glib-object.h> can be included directly."
|
||
#endif
|
||
|
||
#include <gobject/gclosure.h>
|
||
#include <gobject/gvalue.h>
|
||
#include <gobject/gparam.h>
|
||
#include <gobject/gmarshal.h>
|
||
|
||
G_BEGIN_DECLS
|
||
|
||
/* --- typedefs --- */
|
||
typedef struct _GSignalQuery GSignalQuery;
|
||
typedef struct _GSignalInvocationHint GSignalInvocationHint;
|
||
/**
|
||
* GSignalCMarshaller:
|
||
*
|
||
* This is the signature of marshaller functions, required to marshall
|
||
* arrays of parameter values to signal emissions into C language callback
|
||
* invocations.
|
||
*
|
||
* It is merely an alias to #GClosureMarshal since the #GClosure mechanism
|
||
* takes over responsibility of actual function invocation for the signal
|
||
* system.
|
||
*/
|
||
typedef GClosureMarshal GSignalCMarshaller;
|
||
/**
|
||
* GSignalCVaMarshaller:
|
||
*
|
||
* This is the signature of va_list marshaller functions, an optional
|
||
* marshaller that can be used in some situations to avoid
|
||
* marshalling the signal argument into GValues.
|
||
*/
|
||
typedef GVaClosureMarshal GSignalCVaMarshaller;
|
||
/**
|
||
* GSignalEmissionHook:
|
||
* @ihint: Signal invocation hint, see #GSignalInvocationHint.
|
||
* @n_param_values: the number of parameters to the function, including
|
||
* the instance on which the signal was emitted.
|
||
* @param_values: (array length=n_param_values): the instance on which
|
||
* the signal was emitted, followed by the parameters of the emission.
|
||
* @data: user data associated with the hook.
|
||
*
|
||
* A simple function pointer to get invoked when the signal is emitted.
|
||
*
|
||
* Emission hooks allow you to tie a hook to the signal type, so that it will
|
||
* trap all emissions of that signal, from any object.
|
||
*
|
||
* You may not attach these to signals created with the %G_SIGNAL_NO_HOOKS flag.
|
||
*
|
||
* Returns: whether it wants to stay connected. If it returns %FALSE, the signal
|
||
* hook is disconnected (and destroyed).
|
||
*/
|
||
typedef gboolean (*GSignalEmissionHook) (GSignalInvocationHint *ihint,
|
||
guint n_param_values,
|
||
const GValue *param_values,
|
||
gpointer data);
|
||
/**
|
||
* GSignalAccumulator:
|
||
* @ihint: Signal invocation hint, see #GSignalInvocationHint.
|
||
* @return_accu: Accumulator to collect callback return values in, this
|
||
* is the return value of the current signal emission.
|
||
* @handler_return: A #GValue holding the return value of the signal handler.
|
||
* @data: Callback data that was specified when creating the signal.
|
||
*
|
||
* The signal accumulator is a special callback function that can be used
|
||
* to collect return values of the various callbacks that are called
|
||
* during a signal emission.
|
||
*
|
||
* The signal accumulator is specified at signal creation time, if it is
|
||
* left %NULL, no accumulation of callback return values is performed.
|
||
* The return value of signal emissions is then the value returned by the
|
||
* last callback.
|
||
*
|
||
* Returns: The accumulator function returns whether the signal emission
|
||
* should be aborted. Returning %TRUE will continue with
|
||
* the signal emission. Returning %FALSE will abort the current emission.
|
||
* Since 2.62, returning %FALSE will skip to the CLEANUP stage. In this case,
|
||
* emission will occur as normal in the CLEANUP stage and the handler's
|
||
* return value will be accumulated.
|
||
*/
|
||
typedef gboolean (*GSignalAccumulator) (GSignalInvocationHint *ihint,
|
||
GValue *return_accu,
|
||
const GValue *handler_return,
|
||
gpointer data);
|
||
|
||
|
||
/* --- run, match and connect types --- */
|
||
/**
|
||
* GSignalFlags:
|
||
* @G_SIGNAL_RUN_FIRST: Invoke the object method handler in the first emission stage.
|
||
* @G_SIGNAL_RUN_LAST: Invoke the object method handler in the third emission stage.
|
||
* @G_SIGNAL_RUN_CLEANUP: Invoke the object method handler in the last emission stage.
|
||
* @G_SIGNAL_NO_RECURSE: Signals being emitted for an object while currently being in
|
||
* emission for this very object will not be emitted recursively,
|
||
* but instead cause the first emission to be restarted.
|
||
* @G_SIGNAL_DETAILED: This signal supports "::detail" appendices to the signal name
|
||
* upon handler connections and emissions.
|
||
* @G_SIGNAL_ACTION: Action signals are signals that may freely be emitted on alive
|
||
* objects from user code via g_signal_emit() and friends, without
|
||
* the need of being embedded into extra code that performs pre or
|
||
* post emission adjustments on the object. They can also be thought
|
||
* of as object methods which can be called generically by
|
||
* third-party code.
|
||
* @G_SIGNAL_NO_HOOKS: No emissions hooks are supported for this signal.
|
||
* @G_SIGNAL_MUST_COLLECT: Varargs signal emission will always collect the
|
||
* arguments, even if there are no signal handlers connected. Since 2.30.
|
||
* @G_SIGNAL_DEPRECATED: The signal is deprecated and will be removed
|
||
* in a future version. A warning will be generated if it is connected while
|
||
* running with G_ENABLE_DIAGNOSTIC=1. Since 2.32.
|
||
* @G_SIGNAL_ACCUMULATOR_FIRST_RUN: Only used in #GSignalAccumulator accumulator
|
||
* functions for the #GSignalInvocationHint::run_type field to mark the first
|
||
* call to the accumulator function for a signal emission. Since 2.68.
|
||
*
|
||
* The signal flags are used to specify a signal's behaviour.
|
||
*/
|
||
typedef enum
|
||
{
|
||
G_SIGNAL_RUN_FIRST = 1 << 0,
|
||
G_SIGNAL_RUN_LAST = 1 << 1,
|
||
G_SIGNAL_RUN_CLEANUP = 1 << 2,
|
||
G_SIGNAL_NO_RECURSE = 1 << 3,
|
||
G_SIGNAL_DETAILED = 1 << 4,
|
||
G_SIGNAL_ACTION = 1 << 5,
|
||
G_SIGNAL_NO_HOOKS = 1 << 6,
|
||
G_SIGNAL_MUST_COLLECT = 1 << 7,
|
||
G_SIGNAL_DEPRECATED = 1 << 8,
|
||
/* normal signal flags until 1 << 16 */
|
||
G_SIGNAL_ACCUMULATOR_FIRST_RUN = 1 << 17,
|
||
} GSignalFlags;
|
||
/**
|
||
* G_SIGNAL_FLAGS_MASK:
|
||
*
|
||
* A mask for all #GSignalFlags bits.
|
||
*/
|
||
#define G_SIGNAL_FLAGS_MASK 0x1ff
|
||
/**
|
||
* GConnectFlags:
|
||
* @G_CONNECT_DEFAULT: Default behaviour (no special flags). Since: 2.74
|
||
* @G_CONNECT_AFTER: If set, the handler should be called after the
|
||
* default handler of the signal. Normally, the handler is called before
|
||
* the default handler.
|
||
* @G_CONNECT_SWAPPED: If set, the instance and data should be swapped when
|
||
* calling the handler; see g_signal_connect_swapped() for an example.
|
||
*
|
||
* The connection flags are used to specify the behaviour of a signal's
|
||
* connection.
|
||
*/
|
||
typedef enum
|
||
{
|
||
G_CONNECT_DEFAULT GOBJECT_AVAILABLE_ENUMERATOR_IN_2_74 = 0,
|
||
G_CONNECT_AFTER = 1 << 0,
|
||
G_CONNECT_SWAPPED = 1 << 1
|
||
} GConnectFlags;
|
||
/**
|
||
* GSignalMatchType:
|
||
* @G_SIGNAL_MATCH_ID: The signal id must be equal.
|
||
* @G_SIGNAL_MATCH_DETAIL: The signal detail must be equal.
|
||
* @G_SIGNAL_MATCH_CLOSURE: The closure must be the same.
|
||
* @G_SIGNAL_MATCH_FUNC: The C closure callback must be the same.
|
||
* @G_SIGNAL_MATCH_DATA: The closure data must be the same.
|
||
* @G_SIGNAL_MATCH_UNBLOCKED: Only unblocked signals may be matched.
|
||
*
|
||
* The match types specify what g_signal_handlers_block_matched(),
|
||
* g_signal_handlers_unblock_matched() and g_signal_handlers_disconnect_matched()
|
||
* match signals by.
|
||
*/
|
||
typedef enum
|
||
{
|
||
G_SIGNAL_MATCH_ID = 1 << 0,
|
||
G_SIGNAL_MATCH_DETAIL = 1 << 1,
|
||
G_SIGNAL_MATCH_CLOSURE = 1 << 2,
|
||
G_SIGNAL_MATCH_FUNC = 1 << 3,
|
||
G_SIGNAL_MATCH_DATA = 1 << 4,
|
||
G_SIGNAL_MATCH_UNBLOCKED = 1 << 5
|
||
} GSignalMatchType;
|
||
/**
|
||
* G_SIGNAL_MATCH_MASK:
|
||
*
|
||
* A mask for all #GSignalMatchType bits.
|
||
*/
|
||
#define G_SIGNAL_MATCH_MASK 0x3f
|
||
/**
|
||
* G_SIGNAL_TYPE_STATIC_SCOPE:
|
||
*
|
||
* This macro flags signal argument types for which the signal system may
|
||
* assume that instances thereof remain persistent across all signal emissions
|
||
* they are used in. This is only useful for non ref-counted, value-copy types.
|
||
*
|
||
* To flag a signal argument in this way, add `| G_SIGNAL_TYPE_STATIC_SCOPE`
|
||
* to the corresponding argument of g_signal_new().
|
||
* |[
|
||
* g_signal_new ("size_request",
|
||
* G_TYPE_FROM_CLASS (gobject_class),
|
||
* G_SIGNAL_RUN_FIRST,
|
||
* G_STRUCT_OFFSET (GtkWidgetClass, size_request),
|
||
* NULL, NULL,
|
||
* _gtk_marshal_VOID__BOXED,
|
||
* G_TYPE_NONE, 1,
|
||
* GTK_TYPE_REQUISITION | G_SIGNAL_TYPE_STATIC_SCOPE);
|
||
* ]|
|
||
*/
|
||
#define G_SIGNAL_TYPE_STATIC_SCOPE (G_TYPE_FLAG_RESERVED_ID_BIT)
|
||
|
||
|
||
/* --- signal information --- */
|
||
/**
|
||
* GSignalInvocationHint:
|
||
* @signal_id: The signal id of the signal invoking the callback
|
||
* @detail: The detail passed on for this emission
|
||
* @run_type: The stage the signal emission is currently in, this
|
||
* field will contain one of %G_SIGNAL_RUN_FIRST,
|
||
* %G_SIGNAL_RUN_LAST or %G_SIGNAL_RUN_CLEANUP and %G_SIGNAL_ACCUMULATOR_FIRST_RUN.
|
||
* %G_SIGNAL_ACCUMULATOR_FIRST_RUN is only set for the first run of the accumulator
|
||
* function for a signal emission.
|
||
*
|
||
* The #GSignalInvocationHint structure is used to pass on additional information
|
||
* to callbacks during a signal emission.
|
||
*/
|
||
struct _GSignalInvocationHint
|
||
{
|
||
guint signal_id;
|
||
GQuark detail;
|
||
GSignalFlags run_type;
|
||
};
|
||
/**
|
||
* GSignalQuery:
|
||
* @signal_id: The signal id of the signal being queried, or 0 if the
|
||
* signal to be queried was unknown.
|
||
* @signal_name: The signal name.
|
||
* @itype: The interface/instance type that this signal can be emitted for.
|
||
* @signal_flags: The signal flags as passed in to g_signal_new().
|
||
* @return_type: The return type for user callbacks.
|
||
* @n_params: The number of parameters that user callbacks take.
|
||
* @param_types: (array length=n_params): The individual parameter types for
|
||
* user callbacks, note that the effective callback signature is:
|
||
* |[<!-- language="C" -->
|
||
* @return_type callback (#gpointer data1,
|
||
* [param_types param_names,]
|
||
* gpointer data2);
|
||
* ]|
|
||
*
|
||
* A structure holding in-depth information for a specific signal.
|
||
*
|
||
* See also: g_signal_query()
|
||
*/
|
||
struct _GSignalQuery
|
||
{
|
||
guint signal_id;
|
||
const gchar *signal_name;
|
||
GType itype;
|
||
GSignalFlags signal_flags;
|
||
GType return_type; /* mangled with G_SIGNAL_TYPE_STATIC_SCOPE flag */
|
||
guint n_params;
|
||
const GType *param_types; /* mangled with G_SIGNAL_TYPE_STATIC_SCOPE flag */
|
||
};
|
||
|
||
|
||
/* --- signals --- */
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
guint g_signal_newv (const gchar *signal_name,
|
||
GType itype,
|
||
GSignalFlags signal_flags,
|
||
GClosure *class_closure,
|
||
GSignalAccumulator accumulator,
|
||
gpointer accu_data,
|
||
GSignalCMarshaller c_marshaller,
|
||
GType return_type,
|
||
guint n_params,
|
||
GType *param_types);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
guint g_signal_new_valist (const gchar *signal_name,
|
||
GType itype,
|
||
GSignalFlags signal_flags,
|
||
GClosure *class_closure,
|
||
GSignalAccumulator accumulator,
|
||
gpointer accu_data,
|
||
GSignalCMarshaller c_marshaller,
|
||
GType return_type,
|
||
guint n_params,
|
||
va_list args);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
guint g_signal_new (const gchar *signal_name,
|
||
GType itype,
|
||
GSignalFlags signal_flags,
|
||
guint class_offset,
|
||
GSignalAccumulator accumulator,
|
||
gpointer accu_data,
|
||
GSignalCMarshaller c_marshaller,
|
||
GType return_type,
|
||
guint n_params,
|
||
...);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
guint g_signal_new_class_handler (const gchar *signal_name,
|
||
GType itype,
|
||
GSignalFlags signal_flags,
|
||
GCallback class_handler,
|
||
GSignalAccumulator accumulator,
|
||
gpointer accu_data,
|
||
GSignalCMarshaller c_marshaller,
|
||
GType return_type,
|
||
guint n_params,
|
||
...);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
void g_signal_set_va_marshaller (guint signal_id,
|
||
GType instance_type,
|
||
GSignalCVaMarshaller va_marshaller);
|
||
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
void g_signal_emitv (const GValue *instance_and_params,
|
||
guint signal_id,
|
||
GQuark detail,
|
||
GValue *return_value);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
void g_signal_emit_valist (gpointer instance,
|
||
guint signal_id,
|
||
GQuark detail,
|
||
va_list var_args);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
void g_signal_emit (gpointer instance,
|
||
guint signal_id,
|
||
GQuark detail,
|
||
...);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
void g_signal_emit_by_name (gpointer instance,
|
||
const gchar *detailed_signal,
|
||
...);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
guint g_signal_lookup (const gchar *name,
|
||
GType itype);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
const gchar * g_signal_name (guint signal_id);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
void g_signal_query (guint signal_id,
|
||
GSignalQuery *query);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
guint* g_signal_list_ids (GType itype,
|
||
guint *n_ids);
|
||
GOBJECT_AVAILABLE_IN_2_66
|
||
gboolean g_signal_is_valid_name (const gchar *name);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
gboolean g_signal_parse_name (const gchar *detailed_signal,
|
||
GType itype,
|
||
guint *signal_id_p,
|
||
GQuark *detail_p,
|
||
gboolean force_detail_quark);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
GSignalInvocationHint* g_signal_get_invocation_hint (gpointer instance);
|
||
|
||
|
||
/* --- signal emissions --- */
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
void g_signal_stop_emission (gpointer instance,
|
||
guint signal_id,
|
||
GQuark detail);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
void g_signal_stop_emission_by_name (gpointer instance,
|
||
const gchar *detailed_signal);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
gulong g_signal_add_emission_hook (guint signal_id,
|
||
GQuark detail,
|
||
GSignalEmissionHook hook_func,
|
||
gpointer hook_data,
|
||
GDestroyNotify data_destroy);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
void g_signal_remove_emission_hook (guint signal_id,
|
||
gulong hook_id);
|
||
|
||
|
||
/* --- signal handlers --- */
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
gboolean g_signal_has_handler_pending (gpointer instance,
|
||
guint signal_id,
|
||
GQuark detail,
|
||
gboolean may_be_blocked);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
gulong g_signal_connect_closure_by_id (gpointer instance,
|
||
guint signal_id,
|
||
GQuark detail,
|
||
GClosure *closure,
|
||
gboolean after);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
gulong g_signal_connect_closure (gpointer instance,
|
||
const gchar *detailed_signal,
|
||
GClosure *closure,
|
||
gboolean after);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
gulong g_signal_connect_data (gpointer instance,
|
||
const gchar *detailed_signal,
|
||
GCallback c_handler,
|
||
gpointer data,
|
||
GClosureNotify destroy_data,
|
||
GConnectFlags connect_flags);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
void g_signal_handler_block (gpointer instance,
|
||
gulong handler_id);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
void g_signal_handler_unblock (gpointer instance,
|
||
gulong handler_id);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
void g_signal_handler_disconnect (gpointer instance,
|
||
gulong handler_id);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
gboolean g_signal_handler_is_connected (gpointer instance,
|
||
gulong handler_id);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
gulong g_signal_handler_find (gpointer instance,
|
||
GSignalMatchType mask,
|
||
guint signal_id,
|
||
GQuark detail,
|
||
GClosure *closure,
|
||
gpointer func,
|
||
gpointer data);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
guint g_signal_handlers_block_matched (gpointer instance,
|
||
GSignalMatchType mask,
|
||
guint signal_id,
|
||
GQuark detail,
|
||
GClosure *closure,
|
||
gpointer func,
|
||
gpointer data);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
guint g_signal_handlers_unblock_matched (gpointer instance,
|
||
GSignalMatchType mask,
|
||
guint signal_id,
|
||
GQuark detail,
|
||
GClosure *closure,
|
||
gpointer func,
|
||
gpointer data);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
guint g_signal_handlers_disconnect_matched (gpointer instance,
|
||
GSignalMatchType mask,
|
||
guint signal_id,
|
||
GQuark detail,
|
||
GClosure *closure,
|
||
gpointer func,
|
||
gpointer data);
|
||
|
||
GOBJECT_AVAILABLE_IN_2_62
|
||
void g_clear_signal_handler (gulong *handler_id_ptr,
|
||
gpointer instance);
|
||
|
||
#define g_clear_signal_handler(handler_id_ptr, instance) \
|
||
G_STMT_START { \
|
||
gpointer const _instance = (instance); \
|
||
gulong *const _handler_id_ptr = (handler_id_ptr); \
|
||
const gulong _handler_id = *_handler_id_ptr; \
|
||
\
|
||
if (_handler_id > 0) \
|
||
{ \
|
||
*_handler_id_ptr = 0; \
|
||
g_signal_handler_disconnect (_instance, _handler_id); \
|
||
} \
|
||
} G_STMT_END \
|
||
GOBJECT_AVAILABLE_MACRO_IN_2_62
|
||
|
||
/* --- overriding and chaining --- */
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
void g_signal_override_class_closure (guint signal_id,
|
||
GType instance_type,
|
||
GClosure *class_closure);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
void g_signal_override_class_handler (const gchar *signal_name,
|
||
GType instance_type,
|
||
GCallback class_handler);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
void g_signal_chain_from_overridden (const GValue *instance_and_params,
|
||
GValue *return_value);
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
void g_signal_chain_from_overridden_handler (gpointer instance,
|
||
...);
|
||
|
||
|
||
/* --- convenience --- */
|
||
/**
|
||
* g_signal_connect:
|
||
* @instance: the instance to connect to.
|
||
* @detailed_signal: a string of the form "signal-name::detail".
|
||
* @c_handler: the #GCallback to connect.
|
||
* @data: data to pass to @c_handler calls.
|
||
*
|
||
* Connects a [type@GObject.Callback] function to a signal for a particular object.
|
||
*
|
||
* The handler will be called synchronously, before the default handler of the signal.
|
||
* [func@GObject.signal_emit] will not return control until all handlers are called.
|
||
*
|
||
* See [memory management of signal handlers](signals.html#Memory_management_of_signal_handlers) for
|
||
* details on how to handle the return value and memory management of @data.
|
||
*
|
||
* This function cannot fail. If the given signal name doesn’t exist,
|
||
* a critical warning is emitted. No validation is performed on the
|
||
* ‘detail’ string when specified in @detailed_signal, other than a
|
||
* non-empty check.
|
||
*
|
||
* Refer to the [signals documentation](signals.html) for more
|
||
* details.
|
||
*
|
||
* Returns: the handler ID, of type `gulong` (always greater than 0)
|
||
*/
|
||
/* Intentionally not using G_CONNECT_DEFAULT here to avoid deprecation
|
||
* warnings with older GLIB_VERSION_MAX_ALLOWED */
|
||
#define g_signal_connect(instance, detailed_signal, c_handler, data) \
|
||
g_signal_connect_data ((instance), (detailed_signal), (c_handler), (data), NULL, (GConnectFlags) 0)
|
||
/**
|
||
* g_signal_connect_after:
|
||
* @instance: the instance to connect to.
|
||
* @detailed_signal: a string of the form "signal-name::detail".
|
||
* @c_handler: the #GCallback to connect.
|
||
* @data: data to pass to @c_handler calls.
|
||
*
|
||
* Connects a #GCallback function to a signal for a particular object.
|
||
*
|
||
* The handler will be called synchronously, after the default handler of the signal.
|
||
*
|
||
* This function cannot fail. If the given signal name doesn’t exist,
|
||
* a critical warning is emitted. No validation is performed on the
|
||
* ‘detail’ string when specified in @detailed_signal, other than a
|
||
* non-empty check.
|
||
*
|
||
* Refer to the [signals documentation](signals.html) for more
|
||
* details.
|
||
*
|
||
* Returns: the handler ID, of type `gulong` (always greater than 0)
|
||
*/
|
||
#define g_signal_connect_after(instance, detailed_signal, c_handler, data) \
|
||
g_signal_connect_data ((instance), (detailed_signal), (c_handler), (data), NULL, G_CONNECT_AFTER)
|
||
/**
|
||
* g_signal_connect_swapped:
|
||
* @instance: the instance to connect to.
|
||
* @detailed_signal: a string of the form "signal-name::detail".
|
||
* @c_handler: the #GCallback to connect.
|
||
* @data: data to pass to @c_handler calls.
|
||
*
|
||
* Connects a #GCallback function to a signal for a particular object.
|
||
*
|
||
* The instance on which the signal is emitted and @data will be swapped when
|
||
* calling the handler. This is useful when calling pre-existing functions to
|
||
* operate purely on the @data, rather than the @instance: swapping the
|
||
* parameters avoids the need to write a wrapper function.
|
||
*
|
||
* For example, this allows the shorter code:
|
||
* |[<!-- language="C" -->
|
||
* g_signal_connect_swapped (button, "clicked",
|
||
* (GCallback) gtk_widget_hide, other_widget);
|
||
* ]|
|
||
*
|
||
* Rather than the cumbersome:
|
||
* |[<!-- language="C" -->
|
||
* static void
|
||
* button_clicked_cb (GtkButton *button, GtkWidget *other_widget)
|
||
* {
|
||
* gtk_widget_hide (other_widget);
|
||
* }
|
||
*
|
||
* ...
|
||
*
|
||
* g_signal_connect (button, "clicked",
|
||
* (GCallback) button_clicked_cb, other_widget);
|
||
* ]|
|
||
*
|
||
* This function cannot fail. If the given signal name doesn’t exist,
|
||
* a critical warning is emitted. No validation is performed on the
|
||
* ‘detail’ string when specified in @detailed_signal, other than a
|
||
* non-empty check.
|
||
*
|
||
* Refer to the [signals documentation](signals.html) for more
|
||
* details.
|
||
*
|
||
* Returns: the handler ID, of type `gulong` (always greater than 0)
|
||
*/
|
||
#define g_signal_connect_swapped(instance, detailed_signal, c_handler, data) \
|
||
g_signal_connect_data ((instance), (detailed_signal), (c_handler), (data), NULL, G_CONNECT_SWAPPED)
|
||
/**
|
||
* g_signal_handlers_disconnect_by_func:
|
||
* @instance: The instance to remove handlers from.
|
||
* @func: The C closure callback of the handlers (useless for non-C closures).
|
||
* @data: The closure data of the handlers' closures.
|
||
*
|
||
* Disconnects all handlers on an instance that match @func and @data.
|
||
*
|
||
* Returns: The number of handlers that matched.
|
||
*/
|
||
#define g_signal_handlers_disconnect_by_func(instance, func, data) \
|
||
g_signal_handlers_disconnect_matched ((instance), \
|
||
(GSignalMatchType) (G_SIGNAL_MATCH_FUNC | G_SIGNAL_MATCH_DATA), \
|
||
0, 0, NULL, (func), (data))
|
||
|
||
/**
|
||
* g_signal_handlers_disconnect_by_data:
|
||
* @instance: The instance to remove handlers from
|
||
* @data: the closure data of the handlers' closures
|
||
*
|
||
* Disconnects all handlers on an instance that match @data.
|
||
*
|
||
* Returns: The number of handlers that matched.
|
||
*
|
||
* Since: 2.32
|
||
*/
|
||
#define g_signal_handlers_disconnect_by_data(instance, data) \
|
||
g_signal_handlers_disconnect_matched ((instance), G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, (data))
|
||
|
||
/**
|
||
* g_signal_handlers_block_by_func:
|
||
* @instance: The instance to block handlers from.
|
||
* @func: The C closure callback of the handlers (useless for non-C closures).
|
||
* @data: The closure data of the handlers' closures.
|
||
*
|
||
* Blocks all handlers on an instance that match @func and @data.
|
||
*
|
||
* Returns: The number of handlers that matched.
|
||
*/
|
||
#define g_signal_handlers_block_by_func(instance, func, data) \
|
||
g_signal_handlers_block_matched ((instance), \
|
||
(GSignalMatchType) (G_SIGNAL_MATCH_FUNC | G_SIGNAL_MATCH_DATA), \
|
||
0, 0, NULL, (func), (data))
|
||
/**
|
||
* g_signal_handlers_unblock_by_func:
|
||
* @instance: The instance to unblock handlers from.
|
||
* @func: The C closure callback of the handlers (useless for non-C closures).
|
||
* @data: The closure data of the handlers' closures.
|
||
*
|
||
* Unblocks all handlers on an instance that match @func and @data.
|
||
*
|
||
* Returns: The number of handlers that matched.
|
||
*/
|
||
#define g_signal_handlers_unblock_by_func(instance, func, data) \
|
||
g_signal_handlers_unblock_matched ((instance), \
|
||
(GSignalMatchType) (G_SIGNAL_MATCH_FUNC | G_SIGNAL_MATCH_DATA), \
|
||
0, 0, NULL, (func), (data))
|
||
|
||
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
gboolean g_signal_accumulator_true_handled (GSignalInvocationHint *ihint,
|
||
GValue *return_accu,
|
||
const GValue *handler_return,
|
||
gpointer dummy);
|
||
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
gboolean g_signal_accumulator_first_wins (GSignalInvocationHint *ihint,
|
||
GValue *return_accu,
|
||
const GValue *handler_return,
|
||
gpointer dummy);
|
||
|
||
/*< private >*/
|
||
GOBJECT_AVAILABLE_IN_ALL
|
||
void g_signal_handlers_destroy (gpointer instance);
|
||
void _g_signals_destroy (GType itype);
|
||
|
||
G_END_DECLS
|
||
|
||
#endif /* __G_SIGNAL_H__ */
|