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3493 lines
107 KiB
C
3493 lines
107 KiB
C
/* GObject - GLib Type, Object, Parameter and Signal Library
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* Copyright (C) 2000-2001 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* this code is based on the original GtkSignal implementation
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* for the Gtk+ library by Peter Mattis <petm@xcf.berkeley.edu>
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*/
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/*
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* MT safe
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*/
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#include "config.h"
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#include <string.h>
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#include <signal.h>
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#include "gsignal.h"
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#include "gtype-private.h"
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#include "gbsearcharray.h"
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#include "gvaluecollector.h"
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#include "gvaluetypes.h"
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#include "gobject.h"
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#include "genums.h"
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#include "gobject_trace.h"
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/**
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* SECTION:signals
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* @short_description: A means for customization of object behaviour
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* and a general purpose notification mechanism
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* @title: Signals
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*
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* The basic concept of the signal system is that of the
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* <emphasis>emission</emphasis> of a signal. Signals are introduced
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* per-type and are identified through strings. Signals introduced
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* for a parent type are available in derived types as well, so
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* basically they are a per-type facility that is inherited. A signal
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* emission mainly involves invocation of a certain set of callbacks
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* in precisely defined manner. There are two main categories of such
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* callbacks, per-object
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* <footnote><para>Although signals can deal with any kind of instantiatable
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* type, i'm referring to those types as "object types" in the following,
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* simply because that is the context most users will encounter signals in.
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* </para></footnote>
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* ones and user provided ones.
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* The per-object callbacks are most often referred to as "object method
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* handler" or "default (signal) handler", while user provided callbacks are
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* usually just called "signal handler".
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* The object method handler is provided at signal creation time (this most
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* frequently happens at the end of an object class' creation), while user
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* provided handlers are frequently connected and disconnected to/from a certain
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* signal on certain object instances.
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*
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* A signal emission consists of five stages, unless prematurely stopped:
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* <variablelist>
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* <varlistentry><term></term><listitem><para>
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* 1 - Invocation of the object method handler for %G_SIGNAL_RUN_FIRST signals
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* </para></listitem></varlistentry>
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* <varlistentry><term></term><listitem><para>
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* 2 - Invocation of normal user-provided signal handlers (<emphasis>after</emphasis> flag %FALSE)
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* </para></listitem></varlistentry>
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* <varlistentry><term></term><listitem><para>
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* 3 - Invocation of the object method handler for %G_SIGNAL_RUN_LAST signals
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* </para></listitem></varlistentry>
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* <varlistentry><term></term><listitem><para>
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* 4 - Invocation of user provided signal handlers, connected with an <emphasis>after</emphasis> flag of %TRUE
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* </para></listitem></varlistentry>
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* <varlistentry><term></term><listitem><para>
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* 5 - Invocation of the object method handler for %G_SIGNAL_RUN_CLEANUP signals
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* </para></listitem></varlistentry>
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* </variablelist>
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* The user-provided signal handlers are called in the order they were
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* connected in.
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* All handlers may prematurely stop a signal emission, and any number of
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* handlers may be connected, disconnected, blocked or unblocked during
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* a signal emission.
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* There are certain criteria for skipping user handlers in stages 2 and 4
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* of a signal emission.
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* First, user handlers may be <emphasis>blocked</emphasis>, blocked handlers are omitted
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* during callback invocation, to return from the "blocked" state, a
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* handler has to get unblocked exactly the same amount of times
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* it has been blocked before.
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* Second, upon emission of a %G_SIGNAL_DETAILED signal, an additional
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* "detail" argument passed in to g_signal_emit() has to match the detail
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* argument of the signal handler currently subject to invocation.
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* Specification of no detail argument for signal handlers (omission of the
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* detail part of the signal specification upon connection) serves as a
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* wildcard and matches any detail argument passed in to emission.
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*/
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#define REPORT_BUG "please report occurrence circumstances to gtk-devel-list@gnome.org"
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#ifdef G_ENABLE_DEBUG
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#define IF_DEBUG(debug_type, cond) if ((_g_type_debug_flags & G_TYPE_DEBUG_ ## debug_type) || cond)
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static volatile gpointer g_trace_instance_signals = NULL;
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static volatile gpointer g_trap_instance_signals = NULL;
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#endif /* G_ENABLE_DEBUG */
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/* --- typedefs --- */
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typedef struct _SignalNode SignalNode;
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typedef struct _SignalKey SignalKey;
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typedef struct _Emission Emission;
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typedef struct _Handler Handler;
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typedef struct _HandlerList HandlerList;
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typedef struct _HandlerMatch HandlerMatch;
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typedef enum
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{
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EMISSION_STOP,
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EMISSION_RUN,
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EMISSION_HOOK,
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EMISSION_RESTART
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} EmissionState;
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/* --- prototypes --- */
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static inline guint signal_id_lookup (GQuark quark,
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GType itype);
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static void signal_destroy_R (SignalNode *signal_node);
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static inline HandlerList* handler_list_ensure (guint signal_id,
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gpointer instance);
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static inline HandlerList* handler_list_lookup (guint signal_id,
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gpointer instance);
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static inline Handler* handler_new (gboolean after);
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static void handler_insert (guint signal_id,
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gpointer instance,
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Handler *handler);
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static Handler* handler_lookup (gpointer instance,
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gulong handler_id,
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guint *signal_id_p);
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static inline HandlerMatch* handler_match_prepend (HandlerMatch *list,
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Handler *handler,
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guint signal_id);
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static inline HandlerMatch* handler_match_free1_R (HandlerMatch *node,
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gpointer instance);
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static HandlerMatch* handlers_find (gpointer instance,
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GSignalMatchType mask,
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guint signal_id,
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GQuark detail,
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GClosure *closure,
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gpointer func,
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gpointer data,
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gboolean one_and_only);
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static inline void handler_ref (Handler *handler);
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static inline void handler_unref_R (guint signal_id,
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gpointer instance,
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Handler *handler);
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static gint handler_lists_cmp (gconstpointer node1,
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gconstpointer node2);
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static inline void emission_push (Emission **emission_list_p,
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Emission *emission);
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static inline void emission_pop (Emission **emission_list_p,
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Emission *emission);
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static inline Emission* emission_find (Emission *emission_list,
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guint signal_id,
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GQuark detail,
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gpointer instance);
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static gint class_closures_cmp (gconstpointer node1,
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gconstpointer node2);
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static gint signal_key_cmp (gconstpointer node1,
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gconstpointer node2);
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static gboolean signal_emit_unlocked_R (SignalNode *node,
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GQuark detail,
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gpointer instance,
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GValue *return_value,
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const GValue *instance_and_params);
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static const gchar * type_debug_name (GType type);
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/* --- structures --- */
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typedef struct
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{
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GSignalAccumulator func;
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gpointer data;
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} SignalAccumulator;
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typedef struct
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{
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GHook hook;
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GQuark detail;
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} SignalHook;
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#define SIGNAL_HOOK(hook) ((SignalHook*) (hook))
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struct _SignalNode
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{
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/* permanent portion */
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guint signal_id;
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GType itype;
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const gchar *name;
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guint destroyed : 1;
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/* reinitializable portion */
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guint test_class_offset : 12;
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guint flags : 8;
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guint n_params : 8;
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GType *param_types; /* mangled with G_SIGNAL_TYPE_STATIC_SCOPE flag */
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GType return_type; /* mangled with G_SIGNAL_TYPE_STATIC_SCOPE flag */
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GBSearchArray *class_closure_bsa;
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SignalAccumulator *accumulator;
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GSignalCMarshaller c_marshaller;
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GHookList *emission_hooks;
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};
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#define MAX_TEST_CLASS_OFFSET (4096) /* 2^12, 12 bits for test_class_offset */
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#define TEST_CLASS_MAGIC (1) /* indicates NULL class closure, candidate for NOP optimization */
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struct _SignalKey
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{
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GType itype;
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GQuark quark;
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guint signal_id;
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};
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struct _Emission
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{
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Emission *next;
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gpointer instance;
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GSignalInvocationHint ihint;
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EmissionState state;
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GType chain_type;
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};
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struct _HandlerList
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{
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guint signal_id;
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Handler *handlers;
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Handler *tail_before; /* normal signal handlers are appended here */
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Handler *tail_after; /* CONNECT_AFTER handlers are appended here */
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};
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struct _Handler
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{
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gulong sequential_number;
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Handler *next;
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Handler *prev;
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GQuark detail;
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guint ref_count;
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guint block_count : 16;
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#define HANDLER_MAX_BLOCK_COUNT (1 << 16)
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guint after : 1;
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GClosure *closure;
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};
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struct _HandlerMatch
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{
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Handler *handler;
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HandlerMatch *next;
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guint signal_id;
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};
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typedef struct
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{
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GType instance_type; /* 0 for default closure */
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GClosure *closure;
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} ClassClosure;
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/* --- variables --- */
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static GBSearchArray *g_signal_key_bsa = NULL;
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static const GBSearchConfig g_signal_key_bconfig = {
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sizeof (SignalKey),
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signal_key_cmp,
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G_BSEARCH_ARRAY_ALIGN_POWER2,
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};
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static GBSearchConfig g_signal_hlbsa_bconfig = {
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sizeof (HandlerList),
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handler_lists_cmp,
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0,
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};
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static GBSearchConfig g_class_closure_bconfig = {
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sizeof (ClassClosure),
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class_closures_cmp,
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0,
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};
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static GHashTable *g_handler_list_bsa_ht = NULL;
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static Emission *g_recursive_emissions = NULL;
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static Emission *g_restart_emissions = NULL;
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static gulong g_handler_sequential_number = 1;
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G_LOCK_DEFINE_STATIC (g_signal_mutex);
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#define SIGNAL_LOCK() G_LOCK (g_signal_mutex)
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#define SIGNAL_UNLOCK() G_UNLOCK (g_signal_mutex)
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/* --- signal nodes --- */
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static guint g_n_signal_nodes = 0;
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static SignalNode **g_signal_nodes = NULL;
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static inline SignalNode*
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LOOKUP_SIGNAL_NODE (register guint signal_id)
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{
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if (signal_id < g_n_signal_nodes)
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return g_signal_nodes[signal_id];
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else
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return NULL;
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}
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/* --- functions --- */
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static inline guint
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signal_id_lookup (GQuark quark,
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GType itype)
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{
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GType *ifaces, type = itype;
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SignalKey key;
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guint n_ifaces;
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key.quark = quark;
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/* try looking up signals for this type and its ancestors */
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do
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{
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SignalKey *signal_key;
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key.itype = type;
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signal_key = g_bsearch_array_lookup (g_signal_key_bsa, &g_signal_key_bconfig, &key);
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if (signal_key)
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return signal_key->signal_id;
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type = g_type_parent (type);
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}
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while (type);
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/* no luck, try interfaces it exports */
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ifaces = g_type_interfaces (itype, &n_ifaces);
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while (n_ifaces--)
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{
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SignalKey *signal_key;
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key.itype = ifaces[n_ifaces];
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signal_key = g_bsearch_array_lookup (g_signal_key_bsa, &g_signal_key_bconfig, &key);
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if (signal_key)
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{
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g_free (ifaces);
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return signal_key->signal_id;
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}
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}
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g_free (ifaces);
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return 0;
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}
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static gint
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class_closures_cmp (gconstpointer node1,
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gconstpointer node2)
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{
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const ClassClosure *c1 = node1, *c2 = node2;
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return G_BSEARCH_ARRAY_CMP (c1->instance_type, c2->instance_type);
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}
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static gint
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handler_lists_cmp (gconstpointer node1,
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gconstpointer node2)
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{
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const HandlerList *hlist1 = node1, *hlist2 = node2;
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return G_BSEARCH_ARRAY_CMP (hlist1->signal_id, hlist2->signal_id);
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}
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static inline HandlerList*
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handler_list_ensure (guint signal_id,
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gpointer instance)
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{
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GBSearchArray *hlbsa = g_hash_table_lookup (g_handler_list_bsa_ht, instance);
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HandlerList key;
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key.signal_id = signal_id;
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key.handlers = NULL;
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key.tail_before = NULL;
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key.tail_after = NULL;
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if (!hlbsa)
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{
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hlbsa = g_bsearch_array_create (&g_signal_hlbsa_bconfig);
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hlbsa = g_bsearch_array_insert (hlbsa, &g_signal_hlbsa_bconfig, &key);
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g_hash_table_insert (g_handler_list_bsa_ht, instance, hlbsa);
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}
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else
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{
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GBSearchArray *o = hlbsa;
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hlbsa = g_bsearch_array_insert (o, &g_signal_hlbsa_bconfig, &key);
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if (hlbsa != o)
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g_hash_table_insert (g_handler_list_bsa_ht, instance, hlbsa);
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}
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return g_bsearch_array_lookup (hlbsa, &g_signal_hlbsa_bconfig, &key);
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}
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static inline HandlerList*
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handler_list_lookup (guint signal_id,
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gpointer instance)
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{
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GBSearchArray *hlbsa = g_hash_table_lookup (g_handler_list_bsa_ht, instance);
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HandlerList key;
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key.signal_id = signal_id;
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return hlbsa ? g_bsearch_array_lookup (hlbsa, &g_signal_hlbsa_bconfig, &key) : NULL;
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}
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static Handler*
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handler_lookup (gpointer instance,
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gulong handler_id,
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guint *signal_id_p)
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{
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GBSearchArray *hlbsa = g_hash_table_lookup (g_handler_list_bsa_ht, instance);
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if (hlbsa)
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{
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guint i;
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for (i = 0; i < hlbsa->n_nodes; i++)
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{
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HandlerList *hlist = g_bsearch_array_get_nth (hlbsa, &g_signal_hlbsa_bconfig, i);
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Handler *handler;
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for (handler = hlist->handlers; handler; handler = handler->next)
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if (handler->sequential_number == handler_id)
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{
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if (signal_id_p)
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*signal_id_p = hlist->signal_id;
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return handler;
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}
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}
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}
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return NULL;
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}
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static inline HandlerMatch*
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handler_match_prepend (HandlerMatch *list,
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Handler *handler,
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guint signal_id)
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{
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HandlerMatch *node;
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node = g_slice_new (HandlerMatch);
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node->handler = handler;
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node->next = list;
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node->signal_id = signal_id;
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handler_ref (handler);
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return node;
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}
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static inline HandlerMatch*
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handler_match_free1_R (HandlerMatch *node,
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gpointer instance)
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{
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HandlerMatch *next = node->next;
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handler_unref_R (node->signal_id, instance, node->handler);
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g_slice_free (HandlerMatch, node);
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return next;
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}
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static HandlerMatch*
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handlers_find (gpointer instance,
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GSignalMatchType mask,
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guint signal_id,
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GQuark detail,
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GClosure *closure,
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gpointer func,
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gpointer data,
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gboolean one_and_only)
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{
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HandlerMatch *mlist = NULL;
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if (mask & G_SIGNAL_MATCH_ID)
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{
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HandlerList *hlist = handler_list_lookup (signal_id, instance);
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Handler *handler;
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SignalNode *node = NULL;
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if (mask & G_SIGNAL_MATCH_FUNC)
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{
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node = LOOKUP_SIGNAL_NODE (signal_id);
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if (!node || !node->c_marshaller)
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return NULL;
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}
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mask = ~mask;
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for (handler = hlist ? hlist->handlers : NULL; handler; handler = handler->next)
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if (handler->sequential_number &&
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((mask & G_SIGNAL_MATCH_DETAIL) || handler->detail == detail) &&
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((mask & G_SIGNAL_MATCH_CLOSURE) || handler->closure == closure) &&
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((mask & G_SIGNAL_MATCH_DATA) || handler->closure->data == data) &&
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((mask & G_SIGNAL_MATCH_UNBLOCKED) || handler->block_count == 0) &&
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((mask & G_SIGNAL_MATCH_FUNC) || (handler->closure->marshal == node->c_marshaller &&
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handler->closure->meta_marshal == 0 &&
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((GCClosure*) handler->closure)->callback == func)))
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{
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mlist = handler_match_prepend (mlist, handler, signal_id);
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if (one_and_only)
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return mlist;
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}
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}
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else
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{
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GBSearchArray *hlbsa = g_hash_table_lookup (g_handler_list_bsa_ht, instance);
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mask = ~mask;
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if (hlbsa)
|
|
{
|
|
guint i;
|
|
|
|
for (i = 0; i < hlbsa->n_nodes; i++)
|
|
{
|
|
HandlerList *hlist = g_bsearch_array_get_nth (hlbsa, &g_signal_hlbsa_bconfig, i);
|
|
SignalNode *node = NULL;
|
|
Handler *handler;
|
|
|
|
if (!(mask & G_SIGNAL_MATCH_FUNC))
|
|
{
|
|
node = LOOKUP_SIGNAL_NODE (hlist->signal_id);
|
|
if (!node->c_marshaller)
|
|
continue;
|
|
}
|
|
|
|
for (handler = hlist->handlers; handler; handler = handler->next)
|
|
if (handler->sequential_number &&
|
|
((mask & G_SIGNAL_MATCH_DETAIL) || handler->detail == detail) &&
|
|
((mask & G_SIGNAL_MATCH_CLOSURE) || handler->closure == closure) &&
|
|
((mask & G_SIGNAL_MATCH_DATA) || handler->closure->data == data) &&
|
|
((mask & G_SIGNAL_MATCH_UNBLOCKED) || handler->block_count == 0) &&
|
|
((mask & G_SIGNAL_MATCH_FUNC) || (handler->closure->marshal == node->c_marshaller &&
|
|
handler->closure->meta_marshal == 0 &&
|
|
((GCClosure*) handler->closure)->callback == func)))
|
|
{
|
|
mlist = handler_match_prepend (mlist, handler, hlist->signal_id);
|
|
if (one_and_only)
|
|
return mlist;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return mlist;
|
|
}
|
|
|
|
static inline Handler*
|
|
handler_new (gboolean after)
|
|
{
|
|
Handler *handler = g_slice_new (Handler);
|
|
#ifndef G_DISABLE_CHECKS
|
|
if (g_handler_sequential_number < 1)
|
|
g_error (G_STRLOC ": handler id overflow, %s", REPORT_BUG);
|
|
#endif
|
|
|
|
handler->sequential_number = g_handler_sequential_number++;
|
|
handler->prev = NULL;
|
|
handler->next = NULL;
|
|
handler->detail = 0;
|
|
handler->ref_count = 1;
|
|
handler->block_count = 0;
|
|
handler->after = after != FALSE;
|
|
handler->closure = NULL;
|
|
|
|
return handler;
|
|
}
|
|
|
|
static inline void
|
|
handler_ref (Handler *handler)
|
|
{
|
|
g_return_if_fail (handler->ref_count > 0);
|
|
|
|
g_atomic_int_inc ((int *)&handler->ref_count);
|
|
}
|
|
|
|
static inline void
|
|
handler_unref_R (guint signal_id,
|
|
gpointer instance,
|
|
Handler *handler)
|
|
{
|
|
gboolean is_zero;
|
|
|
|
g_return_if_fail (handler->ref_count > 0);
|
|
|
|
is_zero = g_atomic_int_dec_and_test ((int *)&handler->ref_count);
|
|
|
|
if (G_UNLIKELY (is_zero))
|
|
{
|
|
HandlerList *hlist = NULL;
|
|
|
|
if (handler->next)
|
|
handler->next->prev = handler->prev;
|
|
if (handler->prev) /* watch out for g_signal_handlers_destroy()! */
|
|
handler->prev->next = handler->next;
|
|
else
|
|
{
|
|
hlist = handler_list_lookup (signal_id, instance);
|
|
hlist->handlers = handler->next;
|
|
}
|
|
|
|
if (instance)
|
|
{
|
|
/* check if we are removing the handler pointed to by tail_before */
|
|
if (!handler->after && (!handler->next || handler->next->after))
|
|
{
|
|
if (!hlist)
|
|
hlist = handler_list_lookup (signal_id, instance);
|
|
if (hlist)
|
|
{
|
|
g_assert (hlist->tail_before == handler); /* paranoid */
|
|
hlist->tail_before = handler->prev;
|
|
}
|
|
}
|
|
|
|
/* check if we are removing the handler pointed to by tail_after */
|
|
if (!handler->next)
|
|
{
|
|
if (!hlist)
|
|
hlist = handler_list_lookup (signal_id, instance);
|
|
if (hlist)
|
|
{
|
|
g_assert (hlist->tail_after == handler); /* paranoid */
|
|
hlist->tail_after = handler->prev;
|
|
}
|
|
}
|
|
}
|
|
|
|
SIGNAL_UNLOCK ();
|
|
g_closure_unref (handler->closure);
|
|
SIGNAL_LOCK ();
|
|
g_slice_free (Handler, handler);
|
|
}
|
|
}
|
|
|
|
static void
|
|
handler_insert (guint signal_id,
|
|
gpointer instance,
|
|
Handler *handler)
|
|
{
|
|
HandlerList *hlist;
|
|
|
|
g_assert (handler->prev == NULL && handler->next == NULL); /* paranoid */
|
|
|
|
hlist = handler_list_ensure (signal_id, instance);
|
|
if (!hlist->handlers)
|
|
{
|
|
hlist->handlers = handler;
|
|
if (!handler->after)
|
|
hlist->tail_before = handler;
|
|
}
|
|
else if (handler->after)
|
|
{
|
|
handler->prev = hlist->tail_after;
|
|
hlist->tail_after->next = handler;
|
|
}
|
|
else
|
|
{
|
|
if (hlist->tail_before)
|
|
{
|
|
handler->next = hlist->tail_before->next;
|
|
if (handler->next)
|
|
handler->next->prev = handler;
|
|
handler->prev = hlist->tail_before;
|
|
hlist->tail_before->next = handler;
|
|
}
|
|
else /* insert !after handler into a list of only after handlers */
|
|
{
|
|
handler->next = hlist->handlers;
|
|
if (handler->next)
|
|
handler->next->prev = handler;
|
|
hlist->handlers = handler;
|
|
}
|
|
hlist->tail_before = handler;
|
|
}
|
|
|
|
if (!handler->next)
|
|
hlist->tail_after = handler;
|
|
}
|
|
|
|
static inline void
|
|
emission_push (Emission **emission_list_p,
|
|
Emission *emission)
|
|
{
|
|
emission->next = *emission_list_p;
|
|
*emission_list_p = emission;
|
|
}
|
|
|
|
static inline void
|
|
emission_pop (Emission **emission_list_p,
|
|
Emission *emission)
|
|
{
|
|
Emission *node, *last = NULL;
|
|
|
|
for (node = *emission_list_p; node; last = node, node = last->next)
|
|
if (node == emission)
|
|
{
|
|
if (last)
|
|
last->next = node->next;
|
|
else
|
|
*emission_list_p = node->next;
|
|
return;
|
|
}
|
|
g_assert_not_reached ();
|
|
}
|
|
|
|
static inline Emission*
|
|
emission_find (Emission *emission_list,
|
|
guint signal_id,
|
|
GQuark detail,
|
|
gpointer instance)
|
|
{
|
|
Emission *emission;
|
|
|
|
for (emission = emission_list; emission; emission = emission->next)
|
|
if (emission->instance == instance &&
|
|
emission->ihint.signal_id == signal_id &&
|
|
emission->ihint.detail == detail)
|
|
return emission;
|
|
return NULL;
|
|
}
|
|
|
|
static inline Emission*
|
|
emission_find_innermost (gpointer instance)
|
|
{
|
|
Emission *emission, *s = NULL, *c = NULL;
|
|
|
|
for (emission = g_restart_emissions; emission; emission = emission->next)
|
|
if (emission->instance == instance)
|
|
{
|
|
s = emission;
|
|
break;
|
|
}
|
|
for (emission = g_recursive_emissions; emission; emission = emission->next)
|
|
if (emission->instance == instance)
|
|
{
|
|
c = emission;
|
|
break;
|
|
}
|
|
if (!s)
|
|
return c;
|
|
else if (!c)
|
|
return s;
|
|
else
|
|
return G_HAVE_GROWING_STACK ? MAX (c, s) : MIN (c, s);
|
|
}
|
|
|
|
static gint
|
|
signal_key_cmp (gconstpointer node1,
|
|
gconstpointer node2)
|
|
{
|
|
const SignalKey *key1 = node1, *key2 = node2;
|
|
|
|
if (key1->itype == key2->itype)
|
|
return G_BSEARCH_ARRAY_CMP (key1->quark, key2->quark);
|
|
else
|
|
return G_BSEARCH_ARRAY_CMP (key1->itype, key2->itype);
|
|
}
|
|
|
|
void
|
|
_g_signal_init (void)
|
|
{
|
|
SIGNAL_LOCK ();
|
|
if (!g_n_signal_nodes)
|
|
{
|
|
/* setup handler list binary searchable array hash table (in german, that'd be one word ;) */
|
|
g_handler_list_bsa_ht = g_hash_table_new (g_direct_hash, NULL);
|
|
g_signal_key_bsa = g_bsearch_array_create (&g_signal_key_bconfig);
|
|
|
|
/* invalid (0) signal_id */
|
|
g_n_signal_nodes = 1;
|
|
g_signal_nodes = g_renew (SignalNode*, g_signal_nodes, g_n_signal_nodes);
|
|
g_signal_nodes[0] = NULL;
|
|
}
|
|
SIGNAL_UNLOCK ();
|
|
}
|
|
|
|
void
|
|
_g_signals_destroy (GType itype)
|
|
{
|
|
guint i;
|
|
|
|
SIGNAL_LOCK ();
|
|
for (i = 1; i < g_n_signal_nodes; i++)
|
|
{
|
|
SignalNode *node = g_signal_nodes[i];
|
|
|
|
if (node->itype == itype)
|
|
{
|
|
if (node->destroyed)
|
|
g_warning (G_STRLOC ": signal \"%s\" of type `%s' already destroyed",
|
|
node->name,
|
|
type_debug_name (node->itype));
|
|
else
|
|
signal_destroy_R (node);
|
|
}
|
|
}
|
|
SIGNAL_UNLOCK ();
|
|
}
|
|
|
|
/**
|
|
* g_signal_stop_emission:
|
|
* @instance: the object whose signal handlers you wish to stop.
|
|
* @signal_id: the signal identifier, as returned by g_signal_lookup().
|
|
* @detail: the detail which the signal was emitted with.
|
|
*
|
|
* Stops a signal's current emission.
|
|
*
|
|
* This will prevent the default method from running, if the signal was
|
|
* %G_SIGNAL_RUN_LAST and you connected normally (i.e. without the "after"
|
|
* flag).
|
|
*
|
|
* Prints a warning if used on a signal which isn't being emitted.
|
|
*/
|
|
void
|
|
g_signal_stop_emission (gpointer instance,
|
|
guint signal_id,
|
|
GQuark detail)
|
|
{
|
|
SignalNode *node;
|
|
|
|
g_return_if_fail (G_TYPE_CHECK_INSTANCE (instance));
|
|
g_return_if_fail (signal_id > 0);
|
|
|
|
SIGNAL_LOCK ();
|
|
node = LOOKUP_SIGNAL_NODE (signal_id);
|
|
if (node && detail && !(node->flags & G_SIGNAL_DETAILED))
|
|
{
|
|
g_warning ("%s: signal id `%u' does not support detail (%u)", G_STRLOC, signal_id, detail);
|
|
SIGNAL_UNLOCK ();
|
|
return;
|
|
}
|
|
if (node && g_type_is_a (G_TYPE_FROM_INSTANCE (instance), node->itype))
|
|
{
|
|
Emission *emission_list = node->flags & G_SIGNAL_NO_RECURSE ? g_restart_emissions : g_recursive_emissions;
|
|
Emission *emission = emission_find (emission_list, signal_id, detail, instance);
|
|
|
|
if (emission)
|
|
{
|
|
if (emission->state == EMISSION_HOOK)
|
|
g_warning (G_STRLOC ": emission of signal \"%s\" for instance `%p' cannot be stopped from emission hook",
|
|
node->name, instance);
|
|
else if (emission->state == EMISSION_RUN)
|
|
emission->state = EMISSION_STOP;
|
|
}
|
|
else
|
|
g_warning (G_STRLOC ": no emission of signal \"%s\" to stop for instance `%p'",
|
|
node->name, instance);
|
|
}
|
|
else
|
|
g_warning ("%s: signal id `%u' is invalid for instance `%p'", G_STRLOC, signal_id, instance);
|
|
SIGNAL_UNLOCK ();
|
|
}
|
|
|
|
static void
|
|
signal_finalize_hook (GHookList *hook_list,
|
|
GHook *hook)
|
|
{
|
|
GDestroyNotify destroy = hook->destroy;
|
|
|
|
if (destroy)
|
|
{
|
|
hook->destroy = NULL;
|
|
SIGNAL_UNLOCK ();
|
|
destroy (hook->data);
|
|
SIGNAL_LOCK ();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* g_signal_add_emission_hook:
|
|
* @signal_id: the signal identifier, as returned by g_signal_lookup().
|
|
* @detail: the detail on which to call the hook.
|
|
* @hook_func: a #GSignalEmissionHook function.
|
|
* @hook_data: user data for @hook_func.
|
|
* @data_destroy: a #GDestroyNotify for @hook_data.
|
|
*
|
|
* Adds an emission hook for a signal, which will get called for any emission
|
|
* of that signal, independent of the instance. This is possible only
|
|
* for signals which don't have #G_SIGNAL_NO_HOOKS flag set.
|
|
*
|
|
* Returns: the hook id, for later use with g_signal_remove_emission_hook().
|
|
*/
|
|
gulong
|
|
g_signal_add_emission_hook (guint signal_id,
|
|
GQuark detail,
|
|
GSignalEmissionHook hook_func,
|
|
gpointer hook_data,
|
|
GDestroyNotify data_destroy)
|
|
{
|
|
static gulong seq_hook_id = 1;
|
|
SignalNode *node;
|
|
GHook *hook;
|
|
SignalHook *signal_hook;
|
|
|
|
g_return_val_if_fail (signal_id > 0, 0);
|
|
g_return_val_if_fail (hook_func != NULL, 0);
|
|
|
|
SIGNAL_LOCK ();
|
|
node = LOOKUP_SIGNAL_NODE (signal_id);
|
|
if (!node || node->destroyed)
|
|
{
|
|
g_warning ("%s: invalid signal id `%u'", G_STRLOC, signal_id);
|
|
SIGNAL_UNLOCK ();
|
|
return 0;
|
|
}
|
|
if (node->flags & G_SIGNAL_NO_HOOKS)
|
|
{
|
|
g_warning ("%s: signal id `%u' does not support emission hooks (G_SIGNAL_NO_HOOKS flag set)", G_STRLOC, signal_id);
|
|
SIGNAL_UNLOCK ();
|
|
return 0;
|
|
}
|
|
if (detail && !(node->flags & G_SIGNAL_DETAILED))
|
|
{
|
|
g_warning ("%s: signal id `%u' does not support detail (%u)", G_STRLOC, signal_id, detail);
|
|
SIGNAL_UNLOCK ();
|
|
return 0;
|
|
}
|
|
if (!node->emission_hooks)
|
|
{
|
|
node->emission_hooks = g_new (GHookList, 1);
|
|
g_hook_list_init (node->emission_hooks, sizeof (SignalHook));
|
|
node->emission_hooks->finalize_hook = signal_finalize_hook;
|
|
}
|
|
hook = g_hook_alloc (node->emission_hooks);
|
|
hook->data = hook_data;
|
|
hook->func = (gpointer) hook_func;
|
|
hook->destroy = data_destroy;
|
|
signal_hook = SIGNAL_HOOK (hook);
|
|
signal_hook->detail = detail;
|
|
node->emission_hooks->seq_id = seq_hook_id;
|
|
g_hook_append (node->emission_hooks, hook);
|
|
seq_hook_id = node->emission_hooks->seq_id;
|
|
SIGNAL_UNLOCK ();
|
|
|
|
return hook->hook_id;
|
|
}
|
|
|
|
/**
|
|
* g_signal_remove_emission_hook:
|
|
* @signal_id: the id of the signal
|
|
* @hook_id: the id of the emission hook, as returned by
|
|
* g_signal_add_emission_hook()
|
|
*
|
|
* Deletes an emission hook.
|
|
*/
|
|
void
|
|
g_signal_remove_emission_hook (guint signal_id,
|
|
gulong hook_id)
|
|
{
|
|
SignalNode *node;
|
|
|
|
g_return_if_fail (signal_id > 0);
|
|
g_return_if_fail (hook_id > 0);
|
|
|
|
SIGNAL_LOCK ();
|
|
node = LOOKUP_SIGNAL_NODE (signal_id);
|
|
if (!node || node->destroyed)
|
|
g_warning ("%s: invalid signal id `%u'", G_STRLOC, signal_id);
|
|
else if (!node->emission_hooks || !g_hook_destroy (node->emission_hooks, hook_id))
|
|
g_warning ("%s: signal \"%s\" had no hook (%lu) to remove", G_STRLOC, node->name, hook_id);
|
|
SIGNAL_UNLOCK ();
|
|
}
|
|
|
|
static inline guint
|
|
signal_parse_name (const gchar *name,
|
|
GType itype,
|
|
GQuark *detail_p,
|
|
gboolean force_quark)
|
|
{
|
|
const gchar *colon = strchr (name, ':');
|
|
guint signal_id;
|
|
|
|
if (!colon)
|
|
{
|
|
signal_id = signal_id_lookup (g_quark_try_string (name), itype);
|
|
if (signal_id && detail_p)
|
|
*detail_p = 0;
|
|
}
|
|
else if (colon[1] == ':')
|
|
{
|
|
gchar buffer[32];
|
|
guint l = colon - name;
|
|
|
|
if (l < 32)
|
|
{
|
|
memcpy (buffer, name, l);
|
|
buffer[l] = 0;
|
|
signal_id = signal_id_lookup (g_quark_try_string (buffer), itype);
|
|
}
|
|
else
|
|
{
|
|
gchar *signal = g_new (gchar, l + 1);
|
|
|
|
memcpy (signal, name, l);
|
|
signal[l] = 0;
|
|
signal_id = signal_id_lookup (g_quark_try_string (signal), itype);
|
|
g_free (signal);
|
|
}
|
|
|
|
if (signal_id && detail_p)
|
|
*detail_p = colon[2] ? (force_quark ? g_quark_from_string : g_quark_try_string) (colon + 2) : 0;
|
|
}
|
|
else
|
|
signal_id = 0;
|
|
return signal_id;
|
|
}
|
|
|
|
/**
|
|
* g_signal_parse_name:
|
|
* @detailed_signal: a string of the form "signal-name::detail".
|
|
* @itype: The interface/instance type that introduced "signal-name".
|
|
* @signal_id_p: (out): Location to store the signal id.
|
|
* @detail_p: (out): Location to store the detail quark.
|
|
* @force_detail_quark: %TRUE forces creation of a #GQuark for the detail.
|
|
*
|
|
* Internal function to parse a signal name into its @signal_id
|
|
* and @detail quark.
|
|
*
|
|
* Returns: Whether the signal name could successfully be parsed and @signal_id_p and @detail_p contain valid return values.
|
|
*/
|
|
gboolean
|
|
g_signal_parse_name (const gchar *detailed_signal,
|
|
GType itype,
|
|
guint *signal_id_p,
|
|
GQuark *detail_p,
|
|
gboolean force_detail_quark)
|
|
{
|
|
SignalNode *node;
|
|
GQuark detail = 0;
|
|
guint signal_id;
|
|
|
|
g_return_val_if_fail (detailed_signal != NULL, FALSE);
|
|
g_return_val_if_fail (G_TYPE_IS_INSTANTIATABLE (itype) || G_TYPE_IS_INTERFACE (itype), FALSE);
|
|
|
|
SIGNAL_LOCK ();
|
|
signal_id = signal_parse_name (detailed_signal, itype, &detail, force_detail_quark);
|
|
SIGNAL_UNLOCK ();
|
|
|
|
node = signal_id ? LOOKUP_SIGNAL_NODE (signal_id) : NULL;
|
|
if (!node || node->destroyed ||
|
|
(detail && !(node->flags & G_SIGNAL_DETAILED)))
|
|
return FALSE;
|
|
|
|
if (signal_id_p)
|
|
*signal_id_p = signal_id;
|
|
if (detail_p)
|
|
*detail_p = detail;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* g_signal_stop_emission_by_name:
|
|
* @instance: the object whose signal handlers you wish to stop.
|
|
* @detailed_signal: a string of the form "signal-name::detail".
|
|
*
|
|
* Stops a signal's current emission.
|
|
*
|
|
* This is just like g_signal_stop_emission() except it will look up the
|
|
* signal id for you.
|
|
*/
|
|
void
|
|
g_signal_stop_emission_by_name (gpointer instance,
|
|
const gchar *detailed_signal)
|
|
{
|
|
guint signal_id;
|
|
GQuark detail = 0;
|
|
GType itype;
|
|
|
|
g_return_if_fail (G_TYPE_CHECK_INSTANCE (instance));
|
|
g_return_if_fail (detailed_signal != NULL);
|
|
|
|
SIGNAL_LOCK ();
|
|
itype = G_TYPE_FROM_INSTANCE (instance);
|
|
signal_id = signal_parse_name (detailed_signal, itype, &detail, TRUE);
|
|
if (signal_id)
|
|
{
|
|
SignalNode *node = LOOKUP_SIGNAL_NODE (signal_id);
|
|
|
|
if (detail && !(node->flags & G_SIGNAL_DETAILED))
|
|
g_warning ("%s: signal `%s' does not support details", G_STRLOC, detailed_signal);
|
|
else if (!g_type_is_a (itype, node->itype))
|
|
g_warning ("%s: signal `%s' is invalid for instance `%p'", G_STRLOC, detailed_signal, instance);
|
|
else
|
|
{
|
|
Emission *emission_list = node->flags & G_SIGNAL_NO_RECURSE ? g_restart_emissions : g_recursive_emissions;
|
|
Emission *emission = emission_find (emission_list, signal_id, detail, instance);
|
|
|
|
if (emission)
|
|
{
|
|
if (emission->state == EMISSION_HOOK)
|
|
g_warning (G_STRLOC ": emission of signal \"%s\" for instance `%p' cannot be stopped from emission hook",
|
|
node->name, instance);
|
|
else if (emission->state == EMISSION_RUN)
|
|
emission->state = EMISSION_STOP;
|
|
}
|
|
else
|
|
g_warning (G_STRLOC ": no emission of signal \"%s\" to stop for instance `%p'",
|
|
node->name, instance);
|
|
}
|
|
}
|
|
else
|
|
g_warning ("%s: signal `%s' is invalid for instance `%p'", G_STRLOC, detailed_signal, instance);
|
|
SIGNAL_UNLOCK ();
|
|
}
|
|
|
|
/**
|
|
* g_signal_lookup:
|
|
* @name: the signal's name.
|
|
* @itype: the type that the signal operates on.
|
|
*
|
|
* Given the name of the signal and the type of object it connects to, gets
|
|
* the signal's identifying integer. Emitting the signal by number is
|
|
* somewhat faster than using the name each time.
|
|
*
|
|
* Also tries the ancestors of the given type.
|
|
*
|
|
* See g_signal_new() for details on allowed signal names.
|
|
*
|
|
* Returns: the signal's identifying number, or 0 if no signal was found.
|
|
*/
|
|
guint
|
|
g_signal_lookup (const gchar *name,
|
|
GType itype)
|
|
{
|
|
guint signal_id;
|
|
g_return_val_if_fail (name != NULL, 0);
|
|
g_return_val_if_fail (G_TYPE_IS_INSTANTIATABLE (itype) || G_TYPE_IS_INTERFACE (itype), 0);
|
|
|
|
SIGNAL_LOCK ();
|
|
signal_id = signal_id_lookup (g_quark_try_string (name), itype);
|
|
SIGNAL_UNLOCK ();
|
|
if (!signal_id)
|
|
{
|
|
/* give elaborate warnings */
|
|
if (!g_type_name (itype))
|
|
g_warning (G_STRLOC ": unable to lookup signal \"%s\" for invalid type id `%"G_GSIZE_FORMAT"'",
|
|
name, itype);
|
|
else if (!G_TYPE_IS_INSTANTIATABLE (itype))
|
|
g_warning (G_STRLOC ": unable to lookup signal \"%s\" for non instantiatable type `%s'",
|
|
name, g_type_name (itype));
|
|
else if (!g_type_class_peek (itype))
|
|
g_warning (G_STRLOC ": unable to lookup signal \"%s\" of unloaded type `%s'",
|
|
name, g_type_name (itype));
|
|
}
|
|
|
|
return signal_id;
|
|
}
|
|
|
|
/**
|
|
* g_signal_list_ids:
|
|
* @itype: Instance or interface type.
|
|
* @n_ids: Location to store the number of signal ids for @itype.
|
|
*
|
|
* Lists the signals by id that a certain instance or interface type
|
|
* created. Further information about the signals can be acquired through
|
|
* g_signal_query().
|
|
*
|
|
* Returns: (array length=n_ids): Newly allocated array of signal IDs.
|
|
*/
|
|
guint*
|
|
g_signal_list_ids (GType itype,
|
|
guint *n_ids)
|
|
{
|
|
SignalKey *keys;
|
|
GArray *result;
|
|
guint n_nodes;
|
|
guint i;
|
|
|
|
g_return_val_if_fail (G_TYPE_IS_INSTANTIATABLE (itype) || G_TYPE_IS_INTERFACE (itype), NULL);
|
|
g_return_val_if_fail (n_ids != NULL, NULL);
|
|
|
|
SIGNAL_LOCK ();
|
|
keys = g_bsearch_array_get_nth (g_signal_key_bsa, &g_signal_key_bconfig, 0);
|
|
n_nodes = g_bsearch_array_get_n_nodes (g_signal_key_bsa);
|
|
result = g_array_new (FALSE, FALSE, sizeof (guint));
|
|
|
|
for (i = 0; i < n_nodes; i++)
|
|
if (keys[i].itype == itype)
|
|
{
|
|
const gchar *name = g_quark_to_string (keys[i].quark);
|
|
|
|
/* Signal names with "_" in them are aliases to the same
|
|
* name with "-" instead of "_".
|
|
*/
|
|
if (!strchr (name, '_'))
|
|
g_array_append_val (result, keys[i].signal_id);
|
|
}
|
|
*n_ids = result->len;
|
|
SIGNAL_UNLOCK ();
|
|
if (!n_nodes)
|
|
{
|
|
/* give elaborate warnings */
|
|
if (!g_type_name (itype))
|
|
g_warning (G_STRLOC ": unable to list signals for invalid type id `%"G_GSIZE_FORMAT"'",
|
|
itype);
|
|
else if (!G_TYPE_IS_INSTANTIATABLE (itype) && !G_TYPE_IS_INTERFACE (itype))
|
|
g_warning (G_STRLOC ": unable to list signals of non instantiatable type `%s'",
|
|
g_type_name (itype));
|
|
else if (!g_type_class_peek (itype) && !G_TYPE_IS_INTERFACE (itype))
|
|
g_warning (G_STRLOC ": unable to list signals of unloaded type `%s'",
|
|
g_type_name (itype));
|
|
}
|
|
|
|
return (guint*) g_array_free (result, FALSE);
|
|
}
|
|
|
|
/**
|
|
* g_signal_name:
|
|
* @signal_id: the signal's identifying number.
|
|
*
|
|
* Given the signal's identifier, finds its name.
|
|
*
|
|
* Two different signals may have the same name, if they have differing types.
|
|
*
|
|
* Returns: the signal name, or %NULL if the signal number was invalid.
|
|
*/
|
|
const gchar *
|
|
g_signal_name (guint signal_id)
|
|
{
|
|
SignalNode *node;
|
|
const gchar *name;
|
|
|
|
SIGNAL_LOCK ();
|
|
node = LOOKUP_SIGNAL_NODE (signal_id);
|
|
name = node ? node->name : NULL;
|
|
SIGNAL_UNLOCK ();
|
|
|
|
return (char*) name;
|
|
}
|
|
|
|
/**
|
|
* g_signal_query:
|
|
* @signal_id: The signal id of the signal to query information for.
|
|
* @query: (out caller-allocates): A user provided structure that is
|
|
* filled in with constant values upon success.
|
|
*
|
|
* Queries the signal system for in-depth information about a
|
|
* specific signal. This function will fill in a user-provided
|
|
* structure to hold signal-specific information. If an invalid
|
|
* signal id is passed in, the @signal_id member of the #GSignalQuery
|
|
* is 0. All members filled into the #GSignalQuery structure should
|
|
* be considered constant and have to be left untouched.
|
|
*/
|
|
void
|
|
g_signal_query (guint signal_id,
|
|
GSignalQuery *query)
|
|
{
|
|
SignalNode *node;
|
|
|
|
g_return_if_fail (query != NULL);
|
|
|
|
SIGNAL_LOCK ();
|
|
node = LOOKUP_SIGNAL_NODE (signal_id);
|
|
if (!node || node->destroyed)
|
|
query->signal_id = 0;
|
|
else
|
|
{
|
|
query->signal_id = node->signal_id;
|
|
query->signal_name = node->name;
|
|
query->itype = node->itype;
|
|
query->signal_flags = node->flags;
|
|
query->return_type = node->return_type;
|
|
query->n_params = node->n_params;
|
|
query->param_types = node->param_types;
|
|
}
|
|
SIGNAL_UNLOCK ();
|
|
}
|
|
|
|
/**
|
|
* g_signal_new:
|
|
* @signal_name: the name for the signal
|
|
* @itype: the type this signal pertains to. It will also pertain to
|
|
* types which are derived from this type.
|
|
* @signal_flags: a combination of #GSignalFlags specifying detail of when
|
|
* the default handler is to be invoked. You should at least specify
|
|
* %G_SIGNAL_RUN_FIRST or %G_SIGNAL_RUN_LAST.
|
|
* @class_offset: The offset of the function pointer in the class structure
|
|
* for this type. Used to invoke a class method generically. Pass 0 to
|
|
* not associate a class method slot with this signal.
|
|
* @accumulator: the accumulator for this signal; may be %NULL.
|
|
* @accu_data: user data for the @accumulator.
|
|
* @c_marshaller: (allow-none): the function to translate arrays of parameter
|
|
* values to signal emissions into C language callback invocations or %NULL.
|
|
* @return_type: the type of return value, or #G_TYPE_NONE for a signal
|
|
* without a return value.
|
|
* @n_params: the number of parameter types to follow.
|
|
* @...: a list of types, one for each parameter.
|
|
*
|
|
* Creates a new signal. (This is usually done in the class initializer.)
|
|
*
|
|
* A signal name consists of segments consisting of ASCII letters and
|
|
* digits, separated by either the '-' or '_' character. The first
|
|
* character of a signal name must be a letter. Names which violate these
|
|
* rules lead to undefined behaviour of the GSignal system.
|
|
*
|
|
* When registering a signal and looking up a signal, either separator can
|
|
* be used, but they cannot be mixed.
|
|
*
|
|
* If 0 is used for @class_offset subclasses cannot override the class handler
|
|
* in their <code>class_init</code> method by doing
|
|
* <code>super_class->signal_handler = my_signal_handler</code>. Instead they
|
|
* will have to use g_signal_override_class_handler().
|
|
*
|
|
* If c_marshaller is %NULL, g_cclosure_marshal_generic() will be used as
|
|
* the marshaller for this signal.
|
|
*
|
|
* Returns: the signal id
|
|
*/
|
|
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,
|
|
...)
|
|
{
|
|
va_list args;
|
|
guint signal_id;
|
|
|
|
g_return_val_if_fail (signal_name != NULL, 0);
|
|
|
|
va_start (args, n_params);
|
|
|
|
signal_id = g_signal_new_valist (signal_name, itype, signal_flags,
|
|
class_offset ? g_signal_type_cclosure_new (itype, class_offset) : NULL,
|
|
accumulator, accu_data, c_marshaller,
|
|
return_type, n_params, args);
|
|
|
|
va_end (args);
|
|
|
|
/* optimize NOP emissions with NULL class handlers */
|
|
if (signal_id && G_TYPE_IS_INSTANTIATABLE (itype) && return_type == G_TYPE_NONE &&
|
|
class_offset && class_offset < MAX_TEST_CLASS_OFFSET &&
|
|
~signal_flags & G_SIGNAL_MUST_COLLECT)
|
|
{
|
|
SignalNode *node;
|
|
|
|
SIGNAL_LOCK ();
|
|
node = LOOKUP_SIGNAL_NODE (signal_id);
|
|
node->test_class_offset = class_offset;
|
|
SIGNAL_UNLOCK ();
|
|
}
|
|
|
|
return signal_id;
|
|
}
|
|
|
|
/**
|
|
* g_signal_new_class_handler:
|
|
* @signal_name: the name for the signal
|
|
* @itype: the type this signal pertains to. It will also pertain to
|
|
* types which are derived from this type.
|
|
* @signal_flags: a combination of #GSignalFlags specifying detail of when
|
|
* the default handler is to be invoked. You should at least specify
|
|
* %G_SIGNAL_RUN_FIRST or %G_SIGNAL_RUN_LAST.
|
|
* @class_handler: a #GCallback which acts as class implementation of
|
|
* this signal. Used to invoke a class method generically. Pass %NULL to
|
|
* not associate a class method with this signal.
|
|
* @accumulator: the accumulator for this signal; may be %NULL.
|
|
* @accu_data: user data for the @accumulator.
|
|
* @c_marshaller: (allow-none): the function to translate arrays of parameter
|
|
* values to signal emissions into C language callback invocations or %NULL.
|
|
* @return_type: the type of return value, or #G_TYPE_NONE for a signal
|
|
* without a return value.
|
|
* @n_params: the number of parameter types to follow.
|
|
* @...: a list of types, one for each parameter.
|
|
*
|
|
* Creates a new signal. (This is usually done in the class initializer.)
|
|
*
|
|
* This is a variant of g_signal_new() that takes a C callback instead
|
|
* off a class offset for the signal's class handler. This function
|
|
* doesn't need a function pointer exposed in the class structure of
|
|
* an object definition, instead the function pointer is passed
|
|
* directly and can be overriden by derived classes with
|
|
* g_signal_override_class_closure() or
|
|
* g_signal_override_class_handler()and chained to with
|
|
* g_signal_chain_from_overridden() or
|
|
* g_signal_chain_from_overridden_handler().
|
|
*
|
|
* See g_signal_new() for information about signal names.
|
|
*
|
|
* If c_marshaller is %NULL @g_cclosure_marshal_generic will be used as
|
|
* the marshaller for this signal.
|
|
*
|
|
* Returns: the signal id
|
|
*
|
|
* Since: 2.18
|
|
*/
|
|
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,
|
|
...)
|
|
{
|
|
va_list args;
|
|
guint signal_id;
|
|
|
|
g_return_val_if_fail (signal_name != NULL, 0);
|
|
|
|
va_start (args, n_params);
|
|
|
|
signal_id = g_signal_new_valist (signal_name, itype, signal_flags,
|
|
class_handler ? g_cclosure_new (class_handler, NULL, NULL) : NULL,
|
|
accumulator, accu_data, c_marshaller,
|
|
return_type, n_params, args);
|
|
|
|
va_end (args);
|
|
|
|
return signal_id;
|
|
}
|
|
|
|
static inline ClassClosure*
|
|
signal_find_class_closure (SignalNode *node,
|
|
GType itype)
|
|
{
|
|
GBSearchArray *bsa = node->class_closure_bsa;
|
|
ClassClosure *cc;
|
|
|
|
if (bsa)
|
|
{
|
|
ClassClosure key;
|
|
|
|
/* cc->instance_type is 0 for default closure */
|
|
|
|
key.instance_type = itype;
|
|
cc = g_bsearch_array_lookup (bsa, &g_class_closure_bconfig, &key);
|
|
while (!cc && key.instance_type)
|
|
{
|
|
key.instance_type = g_type_parent (key.instance_type);
|
|
cc = g_bsearch_array_lookup (bsa, &g_class_closure_bconfig, &key);
|
|
}
|
|
}
|
|
else
|
|
cc = NULL;
|
|
return cc;
|
|
}
|
|
|
|
static inline GClosure*
|
|
signal_lookup_closure (SignalNode *node,
|
|
GTypeInstance *instance)
|
|
{
|
|
ClassClosure *cc;
|
|
|
|
if (node->class_closure_bsa && g_bsearch_array_get_n_nodes (node->class_closure_bsa) == 1)
|
|
{
|
|
cc = g_bsearch_array_get_nth (node->class_closure_bsa, &g_class_closure_bconfig, 0);
|
|
if (cc && cc->instance_type == 0) /* check for default closure */
|
|
return cc->closure;
|
|
}
|
|
cc = signal_find_class_closure (node, G_TYPE_FROM_INSTANCE (instance));
|
|
return cc ? cc->closure : NULL;
|
|
}
|
|
|
|
static void
|
|
signal_add_class_closure (SignalNode *node,
|
|
GType itype,
|
|
GClosure *closure)
|
|
{
|
|
ClassClosure key;
|
|
|
|
/* can't optimize NOP emissions with overridden class closures */
|
|
node->test_class_offset = 0;
|
|
|
|
if (!node->class_closure_bsa)
|
|
node->class_closure_bsa = g_bsearch_array_create (&g_class_closure_bconfig);
|
|
key.instance_type = itype;
|
|
key.closure = g_closure_ref (closure);
|
|
node->class_closure_bsa = g_bsearch_array_insert (node->class_closure_bsa,
|
|
&g_class_closure_bconfig,
|
|
&key);
|
|
g_closure_sink (closure);
|
|
if (node->c_marshaller && closure && G_CLOSURE_NEEDS_MARSHAL (closure))
|
|
g_closure_set_marshal (closure, node->c_marshaller);
|
|
}
|
|
|
|
/**
|
|
* g_signal_newv:
|
|
* @signal_name: the name for the signal
|
|
* @itype: the type this signal pertains to. It will also pertain to
|
|
* types which are derived from this type
|
|
* @signal_flags: a combination of #GSignalFlags specifying detail of when
|
|
* the default handler is to be invoked. You should at least specify
|
|
* %G_SIGNAL_RUN_FIRST or %G_SIGNAL_RUN_LAST
|
|
* @class_closure: (allow-none): The closure to invoke on signal emission;
|
|
* may be %NULL
|
|
* @accumulator: (allow-none): the accumulator for this signal; may be %NULL
|
|
* @accu_data: user data for the @accumulator
|
|
* @c_marshaller: (allow-none): the function to translate arrays of
|
|
* parameter values to signal emissions into C language callback
|
|
* invocations or %NULL
|
|
* @return_type: the type of return value, or #G_TYPE_NONE for a signal
|
|
* without a return value
|
|
* @n_params: the length of @param_types
|
|
* @param_types: (array length=n_params): an array of types, one for
|
|
* each parameter
|
|
*
|
|
* Creates a new signal. (This is usually done in the class initializer.)
|
|
*
|
|
* See g_signal_new() for details on allowed signal names.
|
|
*
|
|
* If c_marshaller is %NULL @g_cclosure_marshal_generic will be used as
|
|
* the marshaller for this signal.
|
|
*
|
|
* Returns: the signal id
|
|
*/
|
|
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)
|
|
{
|
|
gchar *name;
|
|
guint signal_id, i;
|
|
SignalNode *node;
|
|
|
|
g_return_val_if_fail (signal_name != NULL, 0);
|
|
g_return_val_if_fail (G_TYPE_IS_INSTANTIATABLE (itype) || G_TYPE_IS_INTERFACE (itype), 0);
|
|
if (n_params)
|
|
g_return_val_if_fail (param_types != NULL, 0);
|
|
g_return_val_if_fail ((return_type & G_SIGNAL_TYPE_STATIC_SCOPE) == 0, 0);
|
|
if (return_type == (G_TYPE_NONE & ~G_SIGNAL_TYPE_STATIC_SCOPE))
|
|
g_return_val_if_fail (accumulator == NULL, 0);
|
|
if (!accumulator)
|
|
g_return_val_if_fail (accu_data == NULL, 0);
|
|
|
|
name = g_strdup (signal_name);
|
|
g_strdelimit (name, G_STR_DELIMITERS ":^", '_'); /* FIXME do character checks like for types */
|
|
|
|
SIGNAL_LOCK ();
|
|
|
|
signal_id = signal_id_lookup (g_quark_try_string (name), itype);
|
|
node = LOOKUP_SIGNAL_NODE (signal_id);
|
|
if (node && !node->destroyed)
|
|
{
|
|
g_warning (G_STRLOC ": signal \"%s\" already exists in the `%s' %s",
|
|
name,
|
|
type_debug_name (node->itype),
|
|
G_TYPE_IS_INTERFACE (node->itype) ? "interface" : "class ancestry");
|
|
g_free (name);
|
|
SIGNAL_UNLOCK ();
|
|
return 0;
|
|
}
|
|
if (node && node->itype != itype)
|
|
{
|
|
g_warning (G_STRLOC ": signal \"%s\" for type `%s' was previously created for type `%s'",
|
|
name,
|
|
type_debug_name (itype),
|
|
type_debug_name (node->itype));
|
|
g_free (name);
|
|
SIGNAL_UNLOCK ();
|
|
return 0;
|
|
}
|
|
for (i = 0; i < n_params; i++)
|
|
if (!G_TYPE_IS_VALUE (param_types[i] & ~G_SIGNAL_TYPE_STATIC_SCOPE))
|
|
{
|
|
g_warning (G_STRLOC ": parameter %d of type `%s' for signal \"%s::%s\" is not a value type",
|
|
i + 1, type_debug_name (param_types[i]), type_debug_name (itype), name);
|
|
g_free (name);
|
|
SIGNAL_UNLOCK ();
|
|
return 0;
|
|
}
|
|
if (return_type != G_TYPE_NONE && !G_TYPE_IS_VALUE (return_type & ~G_SIGNAL_TYPE_STATIC_SCOPE))
|
|
{
|
|
g_warning (G_STRLOC ": return value of type `%s' for signal \"%s::%s\" is not a value type",
|
|
type_debug_name (return_type), type_debug_name (itype), name);
|
|
g_free (name);
|
|
SIGNAL_UNLOCK ();
|
|
return 0;
|
|
}
|
|
if (return_type != G_TYPE_NONE &&
|
|
(signal_flags & (G_SIGNAL_RUN_FIRST | G_SIGNAL_RUN_LAST | G_SIGNAL_RUN_CLEANUP)) == G_SIGNAL_RUN_FIRST)
|
|
{
|
|
g_warning (G_STRLOC ": signal \"%s::%s\" has return type `%s' and is only G_SIGNAL_RUN_FIRST",
|
|
type_debug_name (itype), name, type_debug_name (return_type));
|
|
g_free (name);
|
|
SIGNAL_UNLOCK ();
|
|
return 0;
|
|
}
|
|
|
|
/* setup permanent portion of signal node */
|
|
if (!node)
|
|
{
|
|
SignalKey key;
|
|
|
|
signal_id = g_n_signal_nodes++;
|
|
node = g_new (SignalNode, 1);
|
|
node->signal_id = signal_id;
|
|
g_signal_nodes = g_renew (SignalNode*, g_signal_nodes, g_n_signal_nodes);
|
|
g_signal_nodes[signal_id] = node;
|
|
node->itype = itype;
|
|
node->name = name;
|
|
key.itype = itype;
|
|
key.quark = g_quark_from_string (node->name);
|
|
key.signal_id = signal_id;
|
|
g_signal_key_bsa = g_bsearch_array_insert (g_signal_key_bsa, &g_signal_key_bconfig, &key);
|
|
g_strdelimit (name, "_", '-');
|
|
node->name = g_intern_string (name);
|
|
key.quark = g_quark_from_string (name);
|
|
g_signal_key_bsa = g_bsearch_array_insert (g_signal_key_bsa, &g_signal_key_bconfig, &key);
|
|
|
|
TRACE(GOBJECT_SIGNAL_NEW(signal_id, name, itype));
|
|
}
|
|
node->destroyed = FALSE;
|
|
node->test_class_offset = 0;
|
|
|
|
/* setup reinitializable portion */
|
|
node->flags = signal_flags & G_SIGNAL_FLAGS_MASK;
|
|
node->n_params = n_params;
|
|
node->param_types = g_memdup (param_types, sizeof (GType) * n_params);
|
|
node->return_type = return_type;
|
|
node->class_closure_bsa = NULL;
|
|
if (accumulator)
|
|
{
|
|
node->accumulator = g_new (SignalAccumulator, 1);
|
|
node->accumulator->func = accumulator;
|
|
node->accumulator->data = accu_data;
|
|
}
|
|
else
|
|
node->accumulator = NULL;
|
|
if (c_marshaller == NULL)
|
|
c_marshaller = g_cclosure_marshal_generic;
|
|
node->c_marshaller = c_marshaller;
|
|
node->emission_hooks = NULL;
|
|
if (class_closure)
|
|
signal_add_class_closure (node, 0, class_closure);
|
|
else if (G_TYPE_IS_INSTANTIATABLE (itype) &&
|
|
return_type == G_TYPE_NONE &&
|
|
~signal_flags & G_SIGNAL_MUST_COLLECT)
|
|
{
|
|
/* optimize NOP emissions */
|
|
node->test_class_offset = TEST_CLASS_MAGIC;
|
|
}
|
|
SIGNAL_UNLOCK ();
|
|
|
|
g_free (name);
|
|
|
|
return signal_id;
|
|
}
|
|
|
|
/**
|
|
* g_signal_new_valist:
|
|
* @signal_name: the name for the signal
|
|
* @itype: the type this signal pertains to. It will also pertain to
|
|
* types which are derived from this type.
|
|
* @signal_flags: a combination of #GSignalFlags specifying detail of when
|
|
* the default handler is to be invoked. You should at least specify
|
|
* %G_SIGNAL_RUN_FIRST or %G_SIGNAL_RUN_LAST.
|
|
* @class_closure: The closure to invoke on signal emission; may be %NULL.
|
|
* @accumulator: the accumulator for this signal; may be %NULL.
|
|
* @accu_data: user data for the @accumulator.
|
|
* @c_marshaller: (allow-none): the function to translate arrays of parameter
|
|
* values to signal emissions into C language callback invocations or %NULL.
|
|
* @return_type: the type of return value, or #G_TYPE_NONE for a signal
|
|
* without a return value.
|
|
* @n_params: the number of parameter types in @args.
|
|
* @args: va_list of #GType, one for each parameter.
|
|
*
|
|
* Creates a new signal. (This is usually done in the class initializer.)
|
|
*
|
|
* See g_signal_new() for details on allowed signal names.
|
|
*
|
|
* If c_marshaller is %NULL, g_cclosure_marshal_generic() will be used as
|
|
* the marshaller for this signal.
|
|
*
|
|
* Returns: the signal id
|
|
*/
|
|
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)
|
|
{
|
|
GType *param_types;
|
|
guint i;
|
|
guint signal_id;
|
|
|
|
if (n_params > 0)
|
|
{
|
|
param_types = g_new (GType, n_params);
|
|
|
|
for (i = 0; i < n_params; i++)
|
|
param_types[i] = va_arg (args, GType);
|
|
}
|
|
else
|
|
param_types = NULL;
|
|
|
|
signal_id = g_signal_newv (signal_name, itype, signal_flags,
|
|
class_closure, accumulator, accu_data, c_marshaller,
|
|
return_type, n_params, param_types);
|
|
g_free (param_types);
|
|
|
|
return signal_id;
|
|
}
|
|
|
|
static void
|
|
signal_destroy_R (SignalNode *signal_node)
|
|
{
|
|
SignalNode node = *signal_node;
|
|
|
|
signal_node->destroyed = TRUE;
|
|
|
|
/* reentrancy caution, zero out real contents first */
|
|
signal_node->test_class_offset = 0;
|
|
signal_node->n_params = 0;
|
|
signal_node->param_types = NULL;
|
|
signal_node->return_type = 0;
|
|
signal_node->class_closure_bsa = NULL;
|
|
signal_node->accumulator = NULL;
|
|
signal_node->c_marshaller = NULL;
|
|
signal_node->emission_hooks = NULL;
|
|
|
|
#ifdef G_ENABLE_DEBUG
|
|
/* check current emissions */
|
|
{
|
|
Emission *emission;
|
|
|
|
for (emission = (node.flags & G_SIGNAL_NO_RECURSE) ? g_restart_emissions : g_recursive_emissions;
|
|
emission; emission = emission->next)
|
|
if (emission->ihint.signal_id == node.signal_id)
|
|
g_critical (G_STRLOC ": signal \"%s\" being destroyed is currently in emission (instance `%p')",
|
|
node.name, emission->instance);
|
|
}
|
|
#endif
|
|
|
|
/* free contents that need to
|
|
*/
|
|
SIGNAL_UNLOCK ();
|
|
g_free (node.param_types);
|
|
if (node.class_closure_bsa)
|
|
{
|
|
guint i;
|
|
|
|
for (i = 0; i < node.class_closure_bsa->n_nodes; i++)
|
|
{
|
|
ClassClosure *cc = g_bsearch_array_get_nth (node.class_closure_bsa, &g_class_closure_bconfig, i);
|
|
|
|
g_closure_unref (cc->closure);
|
|
}
|
|
g_bsearch_array_free (node.class_closure_bsa, &g_class_closure_bconfig);
|
|
}
|
|
g_free (node.accumulator);
|
|
if (node.emission_hooks)
|
|
{
|
|
g_hook_list_clear (node.emission_hooks);
|
|
g_free (node.emission_hooks);
|
|
}
|
|
SIGNAL_LOCK ();
|
|
}
|
|
|
|
/**
|
|
* g_signal_override_class_closure:
|
|
* @signal_id: the signal id
|
|
* @instance_type: the instance type on which to override the class closure
|
|
* for the signal.
|
|
* @class_closure: the closure.
|
|
*
|
|
* Overrides the class closure (i.e. the default handler) for the given signal
|
|
* for emissions on instances of @instance_type. @instance_type must be derived
|
|
* from the type to which the signal belongs.
|
|
*
|
|
* See g_signal_chain_from_overridden() and
|
|
* g_signal_chain_from_overridden_handler() for how to chain up to the
|
|
* parent class closure from inside the overridden one.
|
|
*/
|
|
void
|
|
g_signal_override_class_closure (guint signal_id,
|
|
GType instance_type,
|
|
GClosure *class_closure)
|
|
{
|
|
SignalNode *node;
|
|
|
|
g_return_if_fail (signal_id > 0);
|
|
g_return_if_fail (class_closure != NULL);
|
|
|
|
SIGNAL_LOCK ();
|
|
node = LOOKUP_SIGNAL_NODE (signal_id);
|
|
if (!g_type_is_a (instance_type, node->itype))
|
|
g_warning ("%s: type `%s' cannot be overridden for signal id `%u'", G_STRLOC, type_debug_name (instance_type), signal_id);
|
|
else
|
|
{
|
|
ClassClosure *cc = signal_find_class_closure (node, instance_type);
|
|
|
|
if (cc && cc->instance_type == instance_type)
|
|
g_warning ("%s: type `%s' is already overridden for signal id `%u'", G_STRLOC, type_debug_name (instance_type), signal_id);
|
|
else
|
|
signal_add_class_closure (node, instance_type, class_closure);
|
|
}
|
|
SIGNAL_UNLOCK ();
|
|
}
|
|
|
|
/**
|
|
* g_signal_override_class_handler:
|
|
* @signal_name: the name for the signal
|
|
* @instance_type: the instance type on which to override the class handler
|
|
* for the signal.
|
|
* @class_handler: the handler.
|
|
*
|
|
* Overrides the class closure (i.e. the default handler) for the
|
|
* given signal for emissions on instances of @instance_type with
|
|
* callabck @class_handler. @instance_type must be derived from the
|
|
* type to which the signal belongs.
|
|
*
|
|
* See g_signal_chain_from_overridden() and
|
|
* g_signal_chain_from_overridden_handler() for how to chain up to the
|
|
* parent class closure from inside the overridden one.
|
|
*
|
|
* Since: 2.18
|
|
*/
|
|
void
|
|
g_signal_override_class_handler (const gchar *signal_name,
|
|
GType instance_type,
|
|
GCallback class_handler)
|
|
{
|
|
guint signal_id;
|
|
|
|
g_return_if_fail (signal_name != NULL);
|
|
g_return_if_fail (instance_type != G_TYPE_NONE);
|
|
g_return_if_fail (class_handler != NULL);
|
|
|
|
signal_id = g_signal_lookup (signal_name, instance_type);
|
|
|
|
if (signal_id)
|
|
g_signal_override_class_closure (signal_id, instance_type,
|
|
g_cclosure_new (class_handler, NULL, NULL));
|
|
else
|
|
g_warning ("%s: signal name '%s' is invalid for type id '%"G_GSIZE_FORMAT"'",
|
|
G_STRLOC, signal_name, instance_type);
|
|
|
|
}
|
|
|
|
/**
|
|
* g_signal_chain_from_overridden:
|
|
* @instance_and_params: (array) the argument list of the signal emission.
|
|
* The first element in the array is a #GValue for the instance the signal
|
|
* is being emitted on. The rest are any arguments to be passed to the signal.
|
|
* @return_value: Location for the return value.
|
|
*
|
|
* Calls the original class closure of a signal. This function should only
|
|
* be called from an overridden class closure; see
|
|
* g_signal_override_class_closure() and
|
|
* g_signal_override_class_handler().
|
|
*/
|
|
void
|
|
g_signal_chain_from_overridden (const GValue *instance_and_params,
|
|
GValue *return_value)
|
|
{
|
|
GType chain_type = 0, restore_type = 0;
|
|
Emission *emission = NULL;
|
|
GClosure *closure = NULL;
|
|
guint n_params = 0;
|
|
gpointer instance;
|
|
|
|
g_return_if_fail (instance_and_params != NULL);
|
|
instance = g_value_peek_pointer (instance_and_params);
|
|
g_return_if_fail (G_TYPE_CHECK_INSTANCE (instance));
|
|
|
|
SIGNAL_LOCK ();
|
|
emission = emission_find_innermost (instance);
|
|
if (emission)
|
|
{
|
|
SignalNode *node = LOOKUP_SIGNAL_NODE (emission->ihint.signal_id);
|
|
|
|
g_assert (node != NULL); /* paranoid */
|
|
|
|
/* we should probably do the same parameter checks as g_signal_emit() here.
|
|
*/
|
|
if (emission->chain_type != G_TYPE_NONE)
|
|
{
|
|
ClassClosure *cc = signal_find_class_closure (node, emission->chain_type);
|
|
|
|
g_assert (cc != NULL); /* closure currently in call stack */
|
|
|
|
n_params = node->n_params;
|
|
restore_type = cc->instance_type;
|
|
cc = signal_find_class_closure (node, g_type_parent (cc->instance_type));
|
|
if (cc && cc->instance_type != restore_type)
|
|
{
|
|
closure = cc->closure;
|
|
chain_type = cc->instance_type;
|
|
}
|
|
}
|
|
else
|
|
g_warning ("%s: signal id `%u' cannot be chained from current emission stage for instance `%p'", G_STRLOC, node->signal_id, instance);
|
|
}
|
|
else
|
|
g_warning ("%s: no signal is currently being emitted for instance `%p'", G_STRLOC, instance);
|
|
|
|
if (closure)
|
|
{
|
|
emission->chain_type = chain_type;
|
|
SIGNAL_UNLOCK ();
|
|
g_closure_invoke (closure,
|
|
return_value,
|
|
n_params + 1,
|
|
instance_and_params,
|
|
&emission->ihint);
|
|
SIGNAL_LOCK ();
|
|
emission->chain_type = restore_type;
|
|
}
|
|
SIGNAL_UNLOCK ();
|
|
}
|
|
|
|
/**
|
|
* g_signal_chain_from_overridden_handler:
|
|
* @instance: the instance the signal is being emitted on.
|
|
* @...: parameters to be passed to the parent class closure, followed by a
|
|
* location for the return value. If the return type of the signal
|
|
* is #G_TYPE_NONE, the return value location can be omitted.
|
|
*
|
|
* Calls the original class closure of a signal. This function should
|
|
* only be called from an overridden class closure; see
|
|
* g_signal_override_class_closure() and
|
|
* g_signal_override_class_handler().
|
|
*
|
|
* Since: 2.18
|
|
*/
|
|
void
|
|
g_signal_chain_from_overridden_handler (gpointer instance,
|
|
...)
|
|
{
|
|
GType chain_type = 0, restore_type = 0;
|
|
Emission *emission = NULL;
|
|
GClosure *closure = NULL;
|
|
SignalNode *node;
|
|
guint n_params = 0;
|
|
|
|
g_return_if_fail (G_TYPE_CHECK_INSTANCE (instance));
|
|
|
|
SIGNAL_LOCK ();
|
|
emission = emission_find_innermost (instance);
|
|
if (emission)
|
|
{
|
|
node = LOOKUP_SIGNAL_NODE (emission->ihint.signal_id);
|
|
|
|
g_assert (node != NULL); /* paranoid */
|
|
|
|
/* we should probably do the same parameter checks as g_signal_emit() here.
|
|
*/
|
|
if (emission->chain_type != G_TYPE_NONE)
|
|
{
|
|
ClassClosure *cc = signal_find_class_closure (node, emission->chain_type);
|
|
|
|
g_assert (cc != NULL); /* closure currently in call stack */
|
|
|
|
n_params = node->n_params;
|
|
restore_type = cc->instance_type;
|
|
cc = signal_find_class_closure (node, g_type_parent (cc->instance_type));
|
|
if (cc && cc->instance_type != restore_type)
|
|
{
|
|
closure = cc->closure;
|
|
chain_type = cc->instance_type;
|
|
}
|
|
}
|
|
else
|
|
g_warning ("%s: signal id `%u' cannot be chained from current emission stage for instance `%p'", G_STRLOC, node->signal_id, instance);
|
|
}
|
|
else
|
|
g_warning ("%s: no signal is currently being emitted for instance `%p'", G_STRLOC, instance);
|
|
|
|
if (closure)
|
|
{
|
|
GValue *instance_and_params;
|
|
GType signal_return_type;
|
|
GValue *param_values;
|
|
va_list var_args;
|
|
guint i;
|
|
|
|
va_start (var_args, instance);
|
|
|
|
signal_return_type = node->return_type;
|
|
instance_and_params = g_slice_alloc0 (sizeof (GValue) * (n_params + 1));
|
|
param_values = instance_and_params + 1;
|
|
|
|
for (i = 0; i < node->n_params; i++)
|
|
{
|
|
gchar *error;
|
|
GType ptype = node->param_types[i] & ~G_SIGNAL_TYPE_STATIC_SCOPE;
|
|
gboolean static_scope = node->param_types[i] & G_SIGNAL_TYPE_STATIC_SCOPE;
|
|
|
|
SIGNAL_UNLOCK ();
|
|
G_VALUE_COLLECT_INIT (param_values + i, ptype,
|
|
var_args,
|
|
static_scope ? G_VALUE_NOCOPY_CONTENTS : 0,
|
|
&error);
|
|
if (error)
|
|
{
|
|
g_warning ("%s: %s", G_STRLOC, error);
|
|
g_free (error);
|
|
|
|
/* we purposely leak the value here, it might not be
|
|
* in a sane state if an error condition occoured
|
|
*/
|
|
while (i--)
|
|
g_value_unset (param_values + i);
|
|
|
|
g_slice_free1 (sizeof (GValue) * (n_params + 1), instance_and_params);
|
|
va_end (var_args);
|
|
return;
|
|
}
|
|
SIGNAL_LOCK ();
|
|
}
|
|
|
|
SIGNAL_UNLOCK ();
|
|
instance_and_params->g_type = 0;
|
|
g_value_init (instance_and_params, G_TYPE_FROM_INSTANCE (instance));
|
|
g_value_set_instance (instance_and_params, instance);
|
|
SIGNAL_LOCK ();
|
|
|
|
emission->chain_type = chain_type;
|
|
SIGNAL_UNLOCK ();
|
|
|
|
if (signal_return_type == G_TYPE_NONE)
|
|
{
|
|
g_closure_invoke (closure,
|
|
NULL,
|
|
n_params + 1,
|
|
instance_and_params,
|
|
&emission->ihint);
|
|
}
|
|
else
|
|
{
|
|
GValue return_value = { 0, };
|
|
gchar *error = NULL;
|
|
GType rtype = signal_return_type & ~G_SIGNAL_TYPE_STATIC_SCOPE;
|
|
gboolean static_scope = signal_return_type & G_SIGNAL_TYPE_STATIC_SCOPE;
|
|
|
|
g_value_init (&return_value, rtype);
|
|
|
|
g_closure_invoke (closure,
|
|
&return_value,
|
|
n_params + 1,
|
|
instance_and_params,
|
|
&emission->ihint);
|
|
|
|
G_VALUE_LCOPY (&return_value,
|
|
var_args,
|
|
static_scope ? G_VALUE_NOCOPY_CONTENTS : 0,
|
|
&error);
|
|
if (!error)
|
|
{
|
|
g_value_unset (&return_value);
|
|
}
|
|
else
|
|
{
|
|
g_warning ("%s: %s", G_STRLOC, error);
|
|
g_free (error);
|
|
|
|
/* we purposely leak the value here, it might not be
|
|
* in a sane state if an error condition occurred
|
|
*/
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < n_params; i++)
|
|
g_value_unset (param_values + i);
|
|
g_value_unset (instance_and_params);
|
|
g_slice_free1 (sizeof (GValue) * (n_params + 1), instance_and_params);
|
|
|
|
va_end (var_args);
|
|
|
|
SIGNAL_LOCK ();
|
|
emission->chain_type = restore_type;
|
|
}
|
|
SIGNAL_UNLOCK ();
|
|
}
|
|
|
|
/**
|
|
* g_signal_get_invocation_hint:
|
|
* @instance: the instance to query
|
|
*
|
|
* Returns the invocation hint of the innermost signal emission of instance.
|
|
*
|
|
* Returns: (transfer none): the invocation hint of the innermost signal emission.
|
|
*/
|
|
GSignalInvocationHint*
|
|
g_signal_get_invocation_hint (gpointer instance)
|
|
{
|
|
Emission *emission = NULL;
|
|
|
|
g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (instance), NULL);
|
|
|
|
SIGNAL_LOCK ();
|
|
emission = emission_find_innermost (instance);
|
|
SIGNAL_UNLOCK ();
|
|
|
|
return emission ? &emission->ihint : NULL;
|
|
}
|
|
|
|
/**
|
|
* g_signal_connect_closure_by_id:
|
|
* @instance: the instance to connect to.
|
|
* @signal_id: the id of the signal.
|
|
* @detail: the detail.
|
|
* @closure: the closure to connect.
|
|
* @after: whether the handler should be called before or after the
|
|
* default handler of the signal.
|
|
*
|
|
* Connects a closure to a signal for a particular object.
|
|
*
|
|
* Returns: the handler id
|
|
*/
|
|
gulong
|
|
g_signal_connect_closure_by_id (gpointer instance,
|
|
guint signal_id,
|
|
GQuark detail,
|
|
GClosure *closure,
|
|
gboolean after)
|
|
{
|
|
SignalNode *node;
|
|
gulong handler_seq_no = 0;
|
|
|
|
g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (instance), 0);
|
|
g_return_val_if_fail (signal_id > 0, 0);
|
|
g_return_val_if_fail (closure != NULL, 0);
|
|
|
|
SIGNAL_LOCK ();
|
|
node = LOOKUP_SIGNAL_NODE (signal_id);
|
|
if (node)
|
|
{
|
|
if (detail && !(node->flags & G_SIGNAL_DETAILED))
|
|
g_warning ("%s: signal id `%u' does not support detail (%u)", G_STRLOC, signal_id, detail);
|
|
else if (!g_type_is_a (G_TYPE_FROM_INSTANCE (instance), node->itype))
|
|
g_warning ("%s: signal id `%u' is invalid for instance `%p'", G_STRLOC, signal_id, instance);
|
|
else
|
|
{
|
|
Handler *handler = handler_new (after);
|
|
|
|
handler_seq_no = handler->sequential_number;
|
|
handler->detail = detail;
|
|
handler->closure = g_closure_ref (closure);
|
|
g_closure_sink (closure);
|
|
handler_insert (signal_id, instance, handler);
|
|
if (node->c_marshaller && G_CLOSURE_NEEDS_MARSHAL (closure))
|
|
g_closure_set_marshal (closure, node->c_marshaller);
|
|
}
|
|
}
|
|
else
|
|
g_warning ("%s: signal id `%u' is invalid for instance `%p'", G_STRLOC, signal_id, instance);
|
|
SIGNAL_UNLOCK ();
|
|
|
|
return handler_seq_no;
|
|
}
|
|
|
|
/**
|
|
* g_signal_connect_closure:
|
|
* @instance: the instance to connect to.
|
|
* @detailed_signal: a string of the form "signal-name::detail".
|
|
* @closure: the closure to connect.
|
|
* @after: whether the handler should be called before or after the
|
|
* default handler of the signal.
|
|
*
|
|
* Connects a closure to a signal for a particular object.
|
|
*
|
|
* Returns: the handler id
|
|
*/
|
|
gulong
|
|
g_signal_connect_closure (gpointer instance,
|
|
const gchar *detailed_signal,
|
|
GClosure *closure,
|
|
gboolean after)
|
|
{
|
|
guint signal_id;
|
|
gulong handler_seq_no = 0;
|
|
GQuark detail = 0;
|
|
GType itype;
|
|
|
|
g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (instance), 0);
|
|
g_return_val_if_fail (detailed_signal != NULL, 0);
|
|
g_return_val_if_fail (closure != NULL, 0);
|
|
|
|
SIGNAL_LOCK ();
|
|
itype = G_TYPE_FROM_INSTANCE (instance);
|
|
signal_id = signal_parse_name (detailed_signal, itype, &detail, TRUE);
|
|
if (signal_id)
|
|
{
|
|
SignalNode *node = LOOKUP_SIGNAL_NODE (signal_id);
|
|
|
|
if (detail && !(node->flags & G_SIGNAL_DETAILED))
|
|
g_warning ("%s: signal `%s' does not support details", G_STRLOC, detailed_signal);
|
|
else if (!g_type_is_a (itype, node->itype))
|
|
g_warning ("%s: signal `%s' is invalid for instance `%p'", G_STRLOC, detailed_signal, instance);
|
|
else
|
|
{
|
|
Handler *handler = handler_new (after);
|
|
|
|
handler_seq_no = handler->sequential_number;
|
|
handler->detail = detail;
|
|
handler->closure = g_closure_ref (closure);
|
|
g_closure_sink (closure);
|
|
handler_insert (signal_id, instance, handler);
|
|
if (node->c_marshaller && G_CLOSURE_NEEDS_MARSHAL (handler->closure))
|
|
g_closure_set_marshal (handler->closure, node->c_marshaller);
|
|
}
|
|
}
|
|
else
|
|
g_warning ("%s: signal `%s' is invalid for instance `%p'", G_STRLOC, detailed_signal, instance);
|
|
SIGNAL_UNLOCK ();
|
|
|
|
return handler_seq_no;
|
|
}
|
|
|
|
/**
|
|
* g_signal_connect_data:
|
|
* @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.
|
|
* @destroy_data: a #GClosureNotify for @data.
|
|
* @connect_flags: a combination of #GConnectFlags.
|
|
*
|
|
* Connects a #GCallback function to a signal for a particular object. Similar
|
|
* to g_signal_connect(), but allows to provide a #GClosureNotify for the data
|
|
* which will be called when the signal handler is disconnected and no longer
|
|
* used. Specify @connect_flags if you need <literal>..._after()</literal> or
|
|
* <literal>..._swapped()</literal> variants of this function.
|
|
*
|
|
* Returns: the handler id
|
|
*/
|
|
gulong
|
|
g_signal_connect_data (gpointer instance,
|
|
const gchar *detailed_signal,
|
|
GCallback c_handler,
|
|
gpointer data,
|
|
GClosureNotify destroy_data,
|
|
GConnectFlags connect_flags)
|
|
{
|
|
guint signal_id;
|
|
gulong handler_seq_no = 0;
|
|
GQuark detail = 0;
|
|
GType itype;
|
|
gboolean swapped, after;
|
|
|
|
g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (instance), 0);
|
|
g_return_val_if_fail (detailed_signal != NULL, 0);
|
|
g_return_val_if_fail (c_handler != NULL, 0);
|
|
|
|
swapped = (connect_flags & G_CONNECT_SWAPPED) != FALSE;
|
|
after = (connect_flags & G_CONNECT_AFTER) != FALSE;
|
|
|
|
SIGNAL_LOCK ();
|
|
itype = G_TYPE_FROM_INSTANCE (instance);
|
|
signal_id = signal_parse_name (detailed_signal, itype, &detail, TRUE);
|
|
if (signal_id)
|
|
{
|
|
SignalNode *node = LOOKUP_SIGNAL_NODE (signal_id);
|
|
|
|
if (detail && !(node->flags & G_SIGNAL_DETAILED))
|
|
g_warning ("%s: signal `%s' does not support details", G_STRLOC, detailed_signal);
|
|
else if (!g_type_is_a (itype, node->itype))
|
|
g_warning ("%s: signal `%s' is invalid for instance `%p'", G_STRLOC, detailed_signal, instance);
|
|
else
|
|
{
|
|
Handler *handler = handler_new (after);
|
|
|
|
handler_seq_no = handler->sequential_number;
|
|
handler->detail = detail;
|
|
handler->closure = g_closure_ref ((swapped ? g_cclosure_new_swap : g_cclosure_new) (c_handler, data, destroy_data));
|
|
g_closure_sink (handler->closure);
|
|
handler_insert (signal_id, instance, handler);
|
|
if (node->c_marshaller && G_CLOSURE_NEEDS_MARSHAL (handler->closure))
|
|
g_closure_set_marshal (handler->closure, node->c_marshaller);
|
|
}
|
|
}
|
|
else
|
|
g_warning ("%s: signal `%s' is invalid for instance `%p'", G_STRLOC, detailed_signal, instance);
|
|
SIGNAL_UNLOCK ();
|
|
|
|
return handler_seq_no;
|
|
}
|
|
|
|
/**
|
|
* g_signal_handler_block:
|
|
* @instance: The instance to block the signal handler of.
|
|
* @handler_id: Handler id of the handler to be blocked.
|
|
*
|
|
* Blocks a handler of an instance so it will not be called during any
|
|
* signal emissions unless it is unblocked again. Thus "blocking" a
|
|
* signal handler means to temporarily deactive it, a signal handler
|
|
* has to be unblocked exactly the same amount of times it has been
|
|
* blocked before to become active again.
|
|
*
|
|
* The @handler_id has to be a valid signal handler id, connected to a
|
|
* signal of @instance.
|
|
*/
|
|
void
|
|
g_signal_handler_block (gpointer instance,
|
|
gulong handler_id)
|
|
{
|
|
Handler *handler;
|
|
|
|
g_return_if_fail (G_TYPE_CHECK_INSTANCE (instance));
|
|
g_return_if_fail (handler_id > 0);
|
|
|
|
SIGNAL_LOCK ();
|
|
handler = handler_lookup (instance, handler_id, NULL);
|
|
if (handler)
|
|
{
|
|
#ifndef G_DISABLE_CHECKS
|
|
if (handler->block_count >= HANDLER_MAX_BLOCK_COUNT - 1)
|
|
g_error (G_STRLOC ": handler block_count overflow, %s", REPORT_BUG);
|
|
#endif
|
|
handler->block_count += 1;
|
|
}
|
|
else
|
|
g_warning ("%s: instance `%p' has no handler with id `%lu'", G_STRLOC, instance, handler_id);
|
|
SIGNAL_UNLOCK ();
|
|
}
|
|
|
|
/**
|
|
* g_signal_handler_unblock:
|
|
* @instance: The instance to unblock the signal handler of.
|
|
* @handler_id: Handler id of the handler to be unblocked.
|
|
*
|
|
* Undoes the effect of a previous g_signal_handler_block() call. A
|
|
* blocked handler is skipped during signal emissions and will not be
|
|
* invoked, unblocking it (for exactly the amount of times it has been
|
|
* blocked before) reverts its "blocked" state, so the handler will be
|
|
* recognized by the signal system and is called upon future or
|
|
* currently ongoing signal emissions (since the order in which
|
|
* handlers are called during signal emissions is deterministic,
|
|
* whether the unblocked handler in question is called as part of a
|
|
* currently ongoing emission depends on how far that emission has
|
|
* proceeded yet).
|
|
*
|
|
* The @handler_id has to be a valid id of a signal handler that is
|
|
* connected to a signal of @instance and is currently blocked.
|
|
*/
|
|
void
|
|
g_signal_handler_unblock (gpointer instance,
|
|
gulong handler_id)
|
|
{
|
|
Handler *handler;
|
|
|
|
g_return_if_fail (G_TYPE_CHECK_INSTANCE (instance));
|
|
g_return_if_fail (handler_id > 0);
|
|
|
|
SIGNAL_LOCK ();
|
|
handler = handler_lookup (instance, handler_id, NULL);
|
|
if (handler)
|
|
{
|
|
if (handler->block_count)
|
|
handler->block_count -= 1;
|
|
else
|
|
g_warning (G_STRLOC ": handler `%lu' of instance `%p' is not blocked", handler_id, instance);
|
|
}
|
|
else
|
|
g_warning ("%s: instance `%p' has no handler with id `%lu'", G_STRLOC, instance, handler_id);
|
|
SIGNAL_UNLOCK ();
|
|
}
|
|
|
|
/**
|
|
* g_signal_handler_disconnect:
|
|
* @instance: The instance to remove the signal handler from.
|
|
* @handler_id: Handler id of the handler to be disconnected.
|
|
*
|
|
* Disconnects a handler from an instance so it will not be called during
|
|
* any future or currently ongoing emissions of the signal it has been
|
|
* connected to. The @handler_id becomes invalid and may be reused.
|
|
*
|
|
* The @handler_id has to be a valid signal handler id, connected to a
|
|
* signal of @instance.
|
|
*/
|
|
void
|
|
g_signal_handler_disconnect (gpointer instance,
|
|
gulong handler_id)
|
|
{
|
|
Handler *handler;
|
|
guint signal_id;
|
|
|
|
g_return_if_fail (G_TYPE_CHECK_INSTANCE (instance));
|
|
g_return_if_fail (handler_id > 0);
|
|
|
|
SIGNAL_LOCK ();
|
|
handler = handler_lookup (instance, handler_id, &signal_id);
|
|
if (handler)
|
|
{
|
|
handler->sequential_number = 0;
|
|
handler->block_count = 1;
|
|
handler_unref_R (signal_id, instance, handler);
|
|
}
|
|
else
|
|
g_warning ("%s: instance `%p' has no handler with id `%lu'", G_STRLOC, instance, handler_id);
|
|
SIGNAL_UNLOCK ();
|
|
}
|
|
|
|
/**
|
|
* g_signal_handler_is_connected:
|
|
* @instance: The instance where a signal handler is sought.
|
|
* @handler_id: the handler id.
|
|
*
|
|
* Returns whether @handler_id is the id of a handler connected to @instance.
|
|
*
|
|
* Returns: whether @handler_id identifies a handler connected to @instance.
|
|
*/
|
|
gboolean
|
|
g_signal_handler_is_connected (gpointer instance,
|
|
gulong handler_id)
|
|
{
|
|
Handler *handler;
|
|
gboolean connected;
|
|
|
|
g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (instance), FALSE);
|
|
|
|
SIGNAL_LOCK ();
|
|
handler = handler_lookup (instance, handler_id, NULL);
|
|
connected = handler != NULL;
|
|
SIGNAL_UNLOCK ();
|
|
|
|
return connected;
|
|
}
|
|
|
|
void
|
|
g_signal_handlers_destroy (gpointer instance)
|
|
{
|
|
GBSearchArray *hlbsa;
|
|
|
|
g_return_if_fail (G_TYPE_CHECK_INSTANCE (instance));
|
|
|
|
SIGNAL_LOCK ();
|
|
hlbsa = g_hash_table_lookup (g_handler_list_bsa_ht, instance);
|
|
if (hlbsa)
|
|
{
|
|
guint i;
|
|
|
|
/* reentrancy caution, delete instance trace first */
|
|
g_hash_table_remove (g_handler_list_bsa_ht, instance);
|
|
|
|
for (i = 0; i < hlbsa->n_nodes; i++)
|
|
{
|
|
HandlerList *hlist = g_bsearch_array_get_nth (hlbsa, &g_signal_hlbsa_bconfig, i);
|
|
Handler *handler = hlist->handlers;
|
|
|
|
while (handler)
|
|
{
|
|
Handler *tmp = handler;
|
|
|
|
handler = tmp->next;
|
|
tmp->block_count = 1;
|
|
/* cruel unlink, this works because _all_ handlers vanish */
|
|
tmp->next = NULL;
|
|
tmp->prev = tmp;
|
|
if (tmp->sequential_number)
|
|
{
|
|
tmp->sequential_number = 0;
|
|
handler_unref_R (0, NULL, tmp);
|
|
}
|
|
}
|
|
}
|
|
g_bsearch_array_free (hlbsa, &g_signal_hlbsa_bconfig);
|
|
}
|
|
SIGNAL_UNLOCK ();
|
|
}
|
|
|
|
/**
|
|
* g_signal_handler_find:
|
|
* @instance: The instance owning the signal handler to be found.
|
|
* @mask: Mask indicating which of @signal_id, @detail, @closure, @func
|
|
* and/or @data the handler has to match.
|
|
* @signal_id: Signal the handler has to be connected to.
|
|
* @detail: Signal detail the handler has to be connected to.
|
|
* @closure: (allow-none): The closure the handler will invoke.
|
|
* @func: The C closure callback of the handler (useless for non-C closures).
|
|
* @data: The closure data of the handler's closure.
|
|
*
|
|
* Finds the first signal handler that matches certain selection criteria.
|
|
* The criteria mask is passed as an OR-ed combination of #GSignalMatchType
|
|
* flags, and the criteria values are passed as arguments.
|
|
* The match @mask has to be non-0 for successful matches.
|
|
* If no handler was found, 0 is returned.
|
|
*
|
|
* Returns: A valid non-0 signal handler id for a successful match.
|
|
*/
|
|
gulong
|
|
g_signal_handler_find (gpointer instance,
|
|
GSignalMatchType mask,
|
|
guint signal_id,
|
|
GQuark detail,
|
|
GClosure *closure,
|
|
gpointer func,
|
|
gpointer data)
|
|
{
|
|
gulong handler_seq_no = 0;
|
|
|
|
g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (instance), 0);
|
|
g_return_val_if_fail ((mask & ~G_SIGNAL_MATCH_MASK) == 0, 0);
|
|
|
|
if (mask & G_SIGNAL_MATCH_MASK)
|
|
{
|
|
HandlerMatch *mlist;
|
|
|
|
SIGNAL_LOCK ();
|
|
mlist = handlers_find (instance, mask, signal_id, detail, closure, func, data, TRUE);
|
|
if (mlist)
|
|
{
|
|
handler_seq_no = mlist->handler->sequential_number;
|
|
handler_match_free1_R (mlist, instance);
|
|
}
|
|
SIGNAL_UNLOCK ();
|
|
}
|
|
|
|
return handler_seq_no;
|
|
}
|
|
|
|
static guint
|
|
signal_handlers_foreach_matched_R (gpointer instance,
|
|
GSignalMatchType mask,
|
|
guint signal_id,
|
|
GQuark detail,
|
|
GClosure *closure,
|
|
gpointer func,
|
|
gpointer data,
|
|
void (*callback) (gpointer instance,
|
|
gulong handler_seq_no))
|
|
{
|
|
HandlerMatch *mlist;
|
|
guint n_handlers = 0;
|
|
|
|
mlist = handlers_find (instance, mask, signal_id, detail, closure, func, data, FALSE);
|
|
while (mlist)
|
|
{
|
|
n_handlers++;
|
|
if (mlist->handler->sequential_number)
|
|
{
|
|
SIGNAL_UNLOCK ();
|
|
callback (instance, mlist->handler->sequential_number);
|
|
SIGNAL_LOCK ();
|
|
}
|
|
mlist = handler_match_free1_R (mlist, instance);
|
|
}
|
|
|
|
return n_handlers;
|
|
}
|
|
|
|
/**
|
|
* g_signal_handlers_block_matched:
|
|
* @instance: The instance to block handlers from.
|
|
* @mask: Mask indicating which of @signal_id, @detail, @closure, @func
|
|
* and/or @data the handlers have to match.
|
|
* @signal_id: Signal the handlers have to be connected to.
|
|
* @detail: Signal detail the handlers have to be connected to.
|
|
* @closure: (allow-none): The closure the handlers will invoke.
|
|
* @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 a certain selection criteria.
|
|
* The criteria mask is passed as an OR-ed combination of #GSignalMatchType
|
|
* flags, and the criteria values are passed as arguments.
|
|
* Passing at least one of the %G_SIGNAL_MATCH_CLOSURE, %G_SIGNAL_MATCH_FUNC
|
|
* or %G_SIGNAL_MATCH_DATA match flags is required for successful matches.
|
|
* If no handlers were found, 0 is returned, the number of blocked handlers
|
|
* otherwise.
|
|
*
|
|
* Returns: The number of handlers that matched.
|
|
*/
|
|
guint
|
|
g_signal_handlers_block_matched (gpointer instance,
|
|
GSignalMatchType mask,
|
|
guint signal_id,
|
|
GQuark detail,
|
|
GClosure *closure,
|
|
gpointer func,
|
|
gpointer data)
|
|
{
|
|
guint n_handlers = 0;
|
|
|
|
g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (instance), 0);
|
|
g_return_val_if_fail ((mask & ~G_SIGNAL_MATCH_MASK) == 0, 0);
|
|
|
|
if (mask & (G_SIGNAL_MATCH_CLOSURE | G_SIGNAL_MATCH_FUNC | G_SIGNAL_MATCH_DATA))
|
|
{
|
|
SIGNAL_LOCK ();
|
|
n_handlers = signal_handlers_foreach_matched_R (instance, mask, signal_id, detail,
|
|
closure, func, data,
|
|
g_signal_handler_block);
|
|
SIGNAL_UNLOCK ();
|
|
}
|
|
|
|
return n_handlers;
|
|
}
|
|
|
|
/**
|
|
* g_signal_handlers_unblock_matched:
|
|
* @instance: The instance to unblock handlers from.
|
|
* @mask: Mask indicating which of @signal_id, @detail, @closure, @func
|
|
* and/or @data the handlers have to match.
|
|
* @signal_id: Signal the handlers have to be connected to.
|
|
* @detail: Signal detail the handlers have to be connected to.
|
|
* @closure: (allow-none): The closure the handlers will invoke.
|
|
* @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 a certain selection
|
|
* criteria. The criteria mask is passed as an OR-ed combination of
|
|
* #GSignalMatchType flags, and the criteria values are passed as arguments.
|
|
* Passing at least one of the %G_SIGNAL_MATCH_CLOSURE, %G_SIGNAL_MATCH_FUNC
|
|
* or %G_SIGNAL_MATCH_DATA match flags is required for successful matches.
|
|
* If no handlers were found, 0 is returned, the number of unblocked handlers
|
|
* otherwise. The match criteria should not apply to any handlers that are
|
|
* not currently blocked.
|
|
*
|
|
* Returns: The number of handlers that matched.
|
|
*/
|
|
guint
|
|
g_signal_handlers_unblock_matched (gpointer instance,
|
|
GSignalMatchType mask,
|
|
guint signal_id,
|
|
GQuark detail,
|
|
GClosure *closure,
|
|
gpointer func,
|
|
gpointer data)
|
|
{
|
|
guint n_handlers = 0;
|
|
|
|
g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (instance), 0);
|
|
g_return_val_if_fail ((mask & ~G_SIGNAL_MATCH_MASK) == 0, 0);
|
|
|
|
if (mask & (G_SIGNAL_MATCH_CLOSURE | G_SIGNAL_MATCH_FUNC | G_SIGNAL_MATCH_DATA))
|
|
{
|
|
SIGNAL_LOCK ();
|
|
n_handlers = signal_handlers_foreach_matched_R (instance, mask, signal_id, detail,
|
|
closure, func, data,
|
|
g_signal_handler_unblock);
|
|
SIGNAL_UNLOCK ();
|
|
}
|
|
|
|
return n_handlers;
|
|
}
|
|
|
|
/**
|
|
* g_signal_handlers_disconnect_matched:
|
|
* @instance: The instance to remove handlers from.
|
|
* @mask: Mask indicating which of @signal_id, @detail, @closure, @func
|
|
* and/or @data the handlers have to match.
|
|
* @signal_id: Signal the handlers have to be connected to.
|
|
* @detail: Signal detail the handlers have to be connected to.
|
|
* @closure: (allow-none): The closure the handlers will invoke.
|
|
* @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 a certain
|
|
* selection criteria. The criteria mask is passed as an OR-ed
|
|
* combination of #GSignalMatchType flags, and the criteria values are
|
|
* passed as arguments. Passing at least one of the
|
|
* %G_SIGNAL_MATCH_CLOSURE, %G_SIGNAL_MATCH_FUNC or
|
|
* %G_SIGNAL_MATCH_DATA match flags is required for successful
|
|
* matches. If no handlers were found, 0 is returned, the number of
|
|
* disconnected handlers otherwise.
|
|
*
|
|
* Returns: The number of handlers that matched.
|
|
*/
|
|
guint
|
|
g_signal_handlers_disconnect_matched (gpointer instance,
|
|
GSignalMatchType mask,
|
|
guint signal_id,
|
|
GQuark detail,
|
|
GClosure *closure,
|
|
gpointer func,
|
|
gpointer data)
|
|
{
|
|
guint n_handlers = 0;
|
|
|
|
g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (instance), 0);
|
|
g_return_val_if_fail ((mask & ~G_SIGNAL_MATCH_MASK) == 0, 0);
|
|
|
|
if (mask & (G_SIGNAL_MATCH_CLOSURE | G_SIGNAL_MATCH_FUNC | G_SIGNAL_MATCH_DATA))
|
|
{
|
|
SIGNAL_LOCK ();
|
|
n_handlers = signal_handlers_foreach_matched_R (instance, mask, signal_id, detail,
|
|
closure, func, data,
|
|
g_signal_handler_disconnect);
|
|
SIGNAL_UNLOCK ();
|
|
}
|
|
|
|
return n_handlers;
|
|
}
|
|
|
|
/**
|
|
* g_signal_has_handler_pending:
|
|
* @instance: the object whose signal handlers are sought.
|
|
* @signal_id: the signal id.
|
|
* @detail: the detail.
|
|
* @may_be_blocked: whether blocked handlers should count as match.
|
|
*
|
|
* Returns whether there are any handlers connected to @instance for the
|
|
* given signal id and detail.
|
|
*
|
|
* One example of when you might use this is when the arguments to the
|
|
* signal are difficult to compute. A class implementor may opt to not
|
|
* emit the signal if no one is attached anyway, thus saving the cost
|
|
* of building the arguments.
|
|
*
|
|
* Returns: %TRUE if a handler is connected to the signal, %FALSE
|
|
* otherwise.
|
|
*/
|
|
gboolean
|
|
g_signal_has_handler_pending (gpointer instance,
|
|
guint signal_id,
|
|
GQuark detail,
|
|
gboolean may_be_blocked)
|
|
{
|
|
HandlerMatch *mlist;
|
|
gboolean has_pending;
|
|
|
|
g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (instance), FALSE);
|
|
g_return_val_if_fail (signal_id > 0, FALSE);
|
|
|
|
SIGNAL_LOCK ();
|
|
if (detail)
|
|
{
|
|
SignalNode *node = LOOKUP_SIGNAL_NODE (signal_id);
|
|
|
|
if (!(node->flags & G_SIGNAL_DETAILED))
|
|
{
|
|
g_warning ("%s: signal id `%u' does not support detail (%u)", G_STRLOC, signal_id, detail);
|
|
SIGNAL_UNLOCK ();
|
|
return FALSE;
|
|
}
|
|
}
|
|
mlist = handlers_find (instance,
|
|
(G_SIGNAL_MATCH_ID | G_SIGNAL_MATCH_DETAIL | (may_be_blocked ? 0 : G_SIGNAL_MATCH_UNBLOCKED)),
|
|
signal_id, detail, NULL, NULL, NULL, TRUE);
|
|
if (mlist)
|
|
{
|
|
has_pending = TRUE;
|
|
handler_match_free1_R (mlist, instance);
|
|
}
|
|
else
|
|
has_pending = FALSE;
|
|
SIGNAL_UNLOCK ();
|
|
|
|
return has_pending;
|
|
}
|
|
|
|
static inline gboolean
|
|
signal_check_skip_emission (SignalNode *node,
|
|
gpointer instance,
|
|
GQuark detail)
|
|
{
|
|
HandlerList *hlist;
|
|
|
|
/* are we able to check for NULL class handlers? */
|
|
if (!node->test_class_offset)
|
|
return FALSE;
|
|
|
|
/* are there emission hooks pending? */
|
|
if (node->emission_hooks && node->emission_hooks->hooks)
|
|
return FALSE;
|
|
|
|
/* is there a non-NULL class handler? */
|
|
if (node->test_class_offset != TEST_CLASS_MAGIC)
|
|
{
|
|
GTypeClass *class = G_TYPE_INSTANCE_GET_CLASS (instance, G_TYPE_FROM_INSTANCE (instance), GTypeClass);
|
|
|
|
if (G_STRUCT_MEMBER (gpointer, class, node->test_class_offset))
|
|
return FALSE;
|
|
}
|
|
|
|
/* are signals being debugged? */
|
|
#ifdef G_ENABLE_DEBUG
|
|
IF_DEBUG (SIGNALS, g_trace_instance_signals || g_trap_instance_signals)
|
|
return FALSE;
|
|
#endif /* G_ENABLE_DEBUG */
|
|
|
|
/* is this a no-recurse signal already in emission? */
|
|
if (node->flags & G_SIGNAL_NO_RECURSE &&
|
|
emission_find (g_restart_emissions, node->signal_id, detail, instance))
|
|
return FALSE;
|
|
|
|
/* do we have pending handlers? */
|
|
hlist = handler_list_lookup (node->signal_id, instance);
|
|
if (hlist && hlist->handlers)
|
|
return FALSE;
|
|
|
|
/* none of the above, no emission required */
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* g_signal_emitv:
|
|
* @instance_and_params: (array): argument list for the signal emission.
|
|
* The first element in the array is a #GValue for the instance the signal
|
|
* is being emitted on. The rest are any arguments to be passed to the signal.
|
|
* @signal_id: the signal id
|
|
* @detail: the detail
|
|
* @return_value: Location to store the return value of the signal emission.
|
|
*
|
|
* Emits a signal.
|
|
*
|
|
* Note that g_signal_emitv() doesn't change @return_value if no handlers are
|
|
* connected, in contrast to g_signal_emit() and g_signal_emit_valist().
|
|
*/
|
|
void
|
|
g_signal_emitv (const GValue *instance_and_params,
|
|
guint signal_id,
|
|
GQuark detail,
|
|
GValue *return_value)
|
|
{
|
|
gpointer instance;
|
|
SignalNode *node;
|
|
#ifdef G_ENABLE_DEBUG
|
|
const GValue *param_values;
|
|
guint i;
|
|
#endif
|
|
|
|
g_return_if_fail (instance_and_params != NULL);
|
|
instance = g_value_peek_pointer (instance_and_params);
|
|
g_return_if_fail (G_TYPE_CHECK_INSTANCE (instance));
|
|
g_return_if_fail (signal_id > 0);
|
|
|
|
#ifdef G_ENABLE_DEBUG
|
|
param_values = instance_and_params + 1;
|
|
#endif
|
|
|
|
SIGNAL_LOCK ();
|
|
node = LOOKUP_SIGNAL_NODE (signal_id);
|
|
if (!node || !g_type_is_a (G_TYPE_FROM_INSTANCE (instance), node->itype))
|
|
{
|
|
g_warning ("%s: signal id `%u' is invalid for instance `%p'", G_STRLOC, signal_id, instance);
|
|
SIGNAL_UNLOCK ();
|
|
return;
|
|
}
|
|
#ifdef G_ENABLE_DEBUG
|
|
if (detail && !(node->flags & G_SIGNAL_DETAILED))
|
|
{
|
|
g_warning ("%s: signal id `%u' does not support detail (%u)", G_STRLOC, signal_id, detail);
|
|
SIGNAL_UNLOCK ();
|
|
return;
|
|
}
|
|
for (i = 0; i < node->n_params; i++)
|
|
if (!G_TYPE_CHECK_VALUE_TYPE (param_values + i, node->param_types[i] & ~G_SIGNAL_TYPE_STATIC_SCOPE))
|
|
{
|
|
g_critical ("%s: value for `%s' parameter %u for signal \"%s\" is of type `%s'",
|
|
G_STRLOC,
|
|
type_debug_name (node->param_types[i]),
|
|
i,
|
|
node->name,
|
|
G_VALUE_TYPE_NAME (param_values + i));
|
|
SIGNAL_UNLOCK ();
|
|
return;
|
|
}
|
|
if (node->return_type != G_TYPE_NONE)
|
|
{
|
|
if (!return_value)
|
|
{
|
|
g_critical ("%s: return value `%s' for signal \"%s\" is (NULL)",
|
|
G_STRLOC,
|
|
type_debug_name (node->return_type),
|
|
node->name);
|
|
SIGNAL_UNLOCK ();
|
|
return;
|
|
}
|
|
else if (!node->accumulator && !G_TYPE_CHECK_VALUE_TYPE (return_value, node->return_type & ~G_SIGNAL_TYPE_STATIC_SCOPE))
|
|
{
|
|
g_critical ("%s: return value `%s' for signal \"%s\" is of type `%s'",
|
|
G_STRLOC,
|
|
type_debug_name (node->return_type),
|
|
node->name,
|
|
G_VALUE_TYPE_NAME (return_value));
|
|
SIGNAL_UNLOCK ();
|
|
return;
|
|
}
|
|
}
|
|
else
|
|
return_value = NULL;
|
|
#endif /* G_ENABLE_DEBUG */
|
|
|
|
/* optimize NOP emissions */
|
|
if (signal_check_skip_emission (node, instance, detail))
|
|
{
|
|
/* nothing to do to emit this signal */
|
|
SIGNAL_UNLOCK ();
|
|
/* g_printerr ("omitting emission of \"%s\"\n", node->name); */
|
|
return;
|
|
}
|
|
|
|
SIGNAL_UNLOCK ();
|
|
signal_emit_unlocked_R (node, detail, instance, return_value, instance_and_params);
|
|
}
|
|
|
|
/**
|
|
* g_signal_emit_valist:
|
|
* @instance: the instance the signal is being emitted on.
|
|
* @signal_id: the signal id
|
|
* @detail: the detail
|
|
* @var_args: a list of parameters to be passed to the signal, followed by a
|
|
* location for the return value. If the return type of the signal
|
|
* is #G_TYPE_NONE, the return value location can be omitted.
|
|
*
|
|
* Emits a signal.
|
|
*
|
|
* Note that g_signal_emit_valist() resets the return value to the default
|
|
* if no handlers are connected, in contrast to g_signal_emitv().
|
|
*/
|
|
void
|
|
g_signal_emit_valist (gpointer instance,
|
|
guint signal_id,
|
|
GQuark detail,
|
|
va_list var_args)
|
|
{
|
|
GValue *instance_and_params;
|
|
GType signal_return_type;
|
|
GValue *param_values;
|
|
SignalNode *node;
|
|
guint i, n_params;
|
|
|
|
g_return_if_fail (G_TYPE_CHECK_INSTANCE (instance));
|
|
g_return_if_fail (signal_id > 0);
|
|
|
|
SIGNAL_LOCK ();
|
|
node = LOOKUP_SIGNAL_NODE (signal_id);
|
|
if (!node || !g_type_is_a (G_TYPE_FROM_INSTANCE (instance), node->itype))
|
|
{
|
|
g_warning ("%s: signal id `%u' is invalid for instance `%p'", G_STRLOC, signal_id, instance);
|
|
SIGNAL_UNLOCK ();
|
|
return;
|
|
}
|
|
#ifndef G_DISABLE_CHECKS
|
|
if (detail && !(node->flags & G_SIGNAL_DETAILED))
|
|
{
|
|
g_warning ("%s: signal id `%u' does not support detail (%u)", G_STRLOC, signal_id, detail);
|
|
SIGNAL_UNLOCK ();
|
|
return;
|
|
}
|
|
#endif /* !G_DISABLE_CHECKS */
|
|
|
|
/* optimize NOP emissions */
|
|
if (signal_check_skip_emission (node, instance, detail))
|
|
{
|
|
/* nothing to do to emit this signal */
|
|
SIGNAL_UNLOCK ();
|
|
/* g_printerr ("omitting emission of \"%s\"\n", node->name); */
|
|
return;
|
|
}
|
|
|
|
n_params = node->n_params;
|
|
signal_return_type = node->return_type;
|
|
instance_and_params = g_slice_alloc0 (sizeof (GValue) * (n_params + 1));
|
|
param_values = instance_and_params + 1;
|
|
|
|
for (i = 0; i < node->n_params; i++)
|
|
{
|
|
gchar *error;
|
|
GType ptype = node->param_types[i] & ~G_SIGNAL_TYPE_STATIC_SCOPE;
|
|
gboolean static_scope = node->param_types[i] & G_SIGNAL_TYPE_STATIC_SCOPE;
|
|
|
|
SIGNAL_UNLOCK ();
|
|
G_VALUE_COLLECT_INIT (param_values + i, ptype,
|
|
var_args,
|
|
static_scope ? G_VALUE_NOCOPY_CONTENTS : 0,
|
|
&error);
|
|
if (error)
|
|
{
|
|
g_warning ("%s: %s", G_STRLOC, error);
|
|
g_free (error);
|
|
|
|
/* we purposely leak the value here, it might not be
|
|
* in a sane state if an error condition occoured
|
|
*/
|
|
while (i--)
|
|
g_value_unset (param_values + i);
|
|
|
|
g_slice_free1 (sizeof (GValue) * (n_params + 1), instance_and_params);
|
|
return;
|
|
}
|
|
SIGNAL_LOCK ();
|
|
}
|
|
SIGNAL_UNLOCK ();
|
|
|
|
instance_and_params->g_type = 0;
|
|
g_value_init (instance_and_params, G_TYPE_FROM_INSTANCE (instance));
|
|
g_value_set_instance (instance_and_params, instance);
|
|
if (signal_return_type == G_TYPE_NONE)
|
|
signal_emit_unlocked_R (node, detail, instance, NULL, instance_and_params);
|
|
else
|
|
{
|
|
GValue return_value = { 0, };
|
|
gchar *error = NULL;
|
|
GType rtype = signal_return_type & ~G_SIGNAL_TYPE_STATIC_SCOPE;
|
|
gboolean static_scope = signal_return_type & G_SIGNAL_TYPE_STATIC_SCOPE;
|
|
|
|
g_value_init (&return_value, rtype);
|
|
|
|
signal_emit_unlocked_R (node, detail, instance, &return_value, instance_and_params);
|
|
|
|
G_VALUE_LCOPY (&return_value,
|
|
var_args,
|
|
static_scope ? G_VALUE_NOCOPY_CONTENTS : 0,
|
|
&error);
|
|
if (!error)
|
|
g_value_unset (&return_value);
|
|
else
|
|
{
|
|
g_warning ("%s: %s", G_STRLOC, error);
|
|
g_free (error);
|
|
|
|
/* we purposely leak the value here, it might not be
|
|
* in a sane state if an error condition occurred
|
|
*/
|
|
}
|
|
}
|
|
for (i = 0; i < n_params; i++)
|
|
g_value_unset (param_values + i);
|
|
g_value_unset (instance_and_params);
|
|
g_slice_free1 (sizeof (GValue) * (n_params + 1), instance_and_params);
|
|
}
|
|
|
|
/**
|
|
* g_signal_emit:
|
|
* @instance: the instance the signal is being emitted on.
|
|
* @signal_id: the signal id
|
|
* @detail: the detail
|
|
* @...: parameters to be passed to the signal, followed by a
|
|
* location for the return value. If the return type of the signal
|
|
* is #G_TYPE_NONE, the return value location can be omitted.
|
|
*
|
|
* Emits a signal.
|
|
*
|
|
* Note that g_signal_emit() resets the return value to the default
|
|
* if no handlers are connected, in contrast to g_signal_emitv().
|
|
*/
|
|
void
|
|
g_signal_emit (gpointer instance,
|
|
guint signal_id,
|
|
GQuark detail,
|
|
...)
|
|
{
|
|
va_list var_args;
|
|
|
|
va_start (var_args, detail);
|
|
g_signal_emit_valist (instance, signal_id, detail, var_args);
|
|
va_end (var_args);
|
|
}
|
|
|
|
/**
|
|
* g_signal_emit_by_name:
|
|
* @instance: the instance the signal is being emitted on.
|
|
* @detailed_signal: a string of the form "signal-name::detail".
|
|
* @...: parameters to be passed to the signal, followed by a
|
|
* location for the return value. If the return type of the signal
|
|
* is #G_TYPE_NONE, the return value location can be omitted.
|
|
*
|
|
* Emits a signal.
|
|
*
|
|
* Note that g_signal_emit_by_name() resets the return value to the default
|
|
* if no handlers are connected, in contrast to g_signal_emitv().
|
|
*/
|
|
void
|
|
g_signal_emit_by_name (gpointer instance,
|
|
const gchar *detailed_signal,
|
|
...)
|
|
{
|
|
GQuark detail = 0;
|
|
guint signal_id;
|
|
|
|
g_return_if_fail (G_TYPE_CHECK_INSTANCE (instance));
|
|
g_return_if_fail (detailed_signal != NULL);
|
|
|
|
SIGNAL_LOCK ();
|
|
signal_id = signal_parse_name (detailed_signal, G_TYPE_FROM_INSTANCE (instance), &detail, TRUE);
|
|
SIGNAL_UNLOCK ();
|
|
|
|
if (signal_id)
|
|
{
|
|
va_list var_args;
|
|
|
|
va_start (var_args, detailed_signal);
|
|
g_signal_emit_valist (instance, signal_id, detail, var_args);
|
|
va_end (var_args);
|
|
}
|
|
else
|
|
g_warning ("%s: signal name `%s' is invalid for instance `%p'", G_STRLOC, detailed_signal, instance);
|
|
}
|
|
|
|
static inline gboolean
|
|
accumulate (GSignalInvocationHint *ihint,
|
|
GValue *return_accu,
|
|
GValue *handler_return,
|
|
SignalAccumulator *accumulator)
|
|
{
|
|
gboolean continue_emission;
|
|
|
|
if (!accumulator)
|
|
return TRUE;
|
|
|
|
continue_emission = accumulator->func (ihint, return_accu, handler_return, accumulator->data);
|
|
g_value_reset (handler_return);
|
|
|
|
return continue_emission;
|
|
}
|
|
|
|
static gboolean
|
|
signal_emit_unlocked_R (SignalNode *node,
|
|
GQuark detail,
|
|
gpointer instance,
|
|
GValue *emission_return,
|
|
const GValue *instance_and_params)
|
|
{
|
|
SignalAccumulator *accumulator;
|
|
Emission emission;
|
|
GClosure *class_closure;
|
|
HandlerList *hlist;
|
|
Handler *handler_list = NULL;
|
|
GValue *return_accu, accu = { 0, };
|
|
guint signal_id;
|
|
gulong max_sequential_handler_number;
|
|
gboolean return_value_altered = FALSE;
|
|
|
|
#ifdef G_ENABLE_DEBUG
|
|
IF_DEBUG (SIGNALS, g_trace_instance_signals == instance || g_trap_instance_signals == instance)
|
|
{
|
|
g_message ("%s::%s(%u) emitted (instance=%p, signal-node=%p)",
|
|
g_type_name (G_TYPE_FROM_INSTANCE (instance)),
|
|
node->name, detail,
|
|
instance, node);
|
|
if (g_trap_instance_signals == instance)
|
|
G_BREAKPOINT ();
|
|
}
|
|
#endif /* G_ENABLE_DEBUG */
|
|
|
|
TRACE(GOBJECT_SIGNAL_EMIT(node->signal_id, detail, instance, G_TYPE_FROM_INSTANCE (instance)));
|
|
|
|
SIGNAL_LOCK ();
|
|
signal_id = node->signal_id;
|
|
if (node->flags & G_SIGNAL_NO_RECURSE)
|
|
{
|
|
Emission *node = emission_find (g_restart_emissions, signal_id, detail, instance);
|
|
|
|
if (node)
|
|
{
|
|
node->state = EMISSION_RESTART;
|
|
SIGNAL_UNLOCK ();
|
|
return return_value_altered;
|
|
}
|
|
}
|
|
accumulator = node->accumulator;
|
|
if (accumulator)
|
|
{
|
|
SIGNAL_UNLOCK ();
|
|
g_value_init (&accu, node->return_type & ~G_SIGNAL_TYPE_STATIC_SCOPE);
|
|
return_accu = &accu;
|
|
SIGNAL_LOCK ();
|
|
}
|
|
else
|
|
return_accu = emission_return;
|
|
emission.instance = instance;
|
|
emission.ihint.signal_id = node->signal_id;
|
|
emission.ihint.detail = detail;
|
|
emission.ihint.run_type = 0;
|
|
emission.state = 0;
|
|
emission.chain_type = G_TYPE_NONE;
|
|
emission_push ((node->flags & G_SIGNAL_NO_RECURSE) ? &g_restart_emissions : &g_recursive_emissions, &emission);
|
|
class_closure = signal_lookup_closure (node, instance);
|
|
|
|
EMIT_RESTART:
|
|
|
|
if (handler_list)
|
|
handler_unref_R (signal_id, instance, handler_list);
|
|
max_sequential_handler_number = g_handler_sequential_number;
|
|
hlist = handler_list_lookup (signal_id, instance);
|
|
handler_list = hlist ? hlist->handlers : NULL;
|
|
if (handler_list)
|
|
handler_ref (handler_list);
|
|
|
|
emission.ihint.run_type = G_SIGNAL_RUN_FIRST;
|
|
|
|
if ((node->flags & G_SIGNAL_RUN_FIRST) && class_closure)
|
|
{
|
|
emission.state = EMISSION_RUN;
|
|
|
|
emission.chain_type = G_TYPE_FROM_INSTANCE (instance);
|
|
SIGNAL_UNLOCK ();
|
|
g_closure_invoke (class_closure,
|
|
return_accu,
|
|
node->n_params + 1,
|
|
instance_and_params,
|
|
&emission.ihint);
|
|
if (!accumulate (&emission.ihint, emission_return, &accu, accumulator) &&
|
|
emission.state == EMISSION_RUN)
|
|
emission.state = EMISSION_STOP;
|
|
SIGNAL_LOCK ();
|
|
emission.chain_type = G_TYPE_NONE;
|
|
return_value_altered = TRUE;
|
|
|
|
if (emission.state == EMISSION_STOP)
|
|
goto EMIT_CLEANUP;
|
|
else if (emission.state == EMISSION_RESTART)
|
|
goto EMIT_RESTART;
|
|
}
|
|
|
|
if (node->emission_hooks)
|
|
{
|
|
gboolean need_destroy, was_in_call, may_recurse = TRUE;
|
|
GHook *hook;
|
|
|
|
emission.state = EMISSION_HOOK;
|
|
hook = g_hook_first_valid (node->emission_hooks, may_recurse);
|
|
while (hook)
|
|
{
|
|
SignalHook *signal_hook = SIGNAL_HOOK (hook);
|
|
|
|
if (!signal_hook->detail || signal_hook->detail == detail)
|
|
{
|
|
GSignalEmissionHook hook_func = (GSignalEmissionHook) hook->func;
|
|
|
|
was_in_call = G_HOOK_IN_CALL (hook);
|
|
hook->flags |= G_HOOK_FLAG_IN_CALL;
|
|
SIGNAL_UNLOCK ();
|
|
need_destroy = !hook_func (&emission.ihint, node->n_params + 1, instance_and_params, hook->data);
|
|
SIGNAL_LOCK ();
|
|
if (!was_in_call)
|
|
hook->flags &= ~G_HOOK_FLAG_IN_CALL;
|
|
if (need_destroy)
|
|
g_hook_destroy_link (node->emission_hooks, hook);
|
|
}
|
|
hook = g_hook_next_valid (node->emission_hooks, hook, may_recurse);
|
|
}
|
|
|
|
if (emission.state == EMISSION_RESTART)
|
|
goto EMIT_RESTART;
|
|
}
|
|
|
|
if (handler_list)
|
|
{
|
|
Handler *handler = handler_list;
|
|
|
|
emission.state = EMISSION_RUN;
|
|
handler_ref (handler);
|
|
do
|
|
{
|
|
Handler *tmp;
|
|
|
|
if (handler->after)
|
|
{
|
|
handler_unref_R (signal_id, instance, handler_list);
|
|
handler_list = handler;
|
|
break;
|
|
}
|
|
else if (!handler->block_count && (!handler->detail || handler->detail == detail) &&
|
|
handler->sequential_number < max_sequential_handler_number)
|
|
{
|
|
SIGNAL_UNLOCK ();
|
|
g_closure_invoke (handler->closure,
|
|
return_accu,
|
|
node->n_params + 1,
|
|
instance_and_params,
|
|
&emission.ihint);
|
|
if (!accumulate (&emission.ihint, emission_return, &accu, accumulator) &&
|
|
emission.state == EMISSION_RUN)
|
|
emission.state = EMISSION_STOP;
|
|
SIGNAL_LOCK ();
|
|
return_value_altered = TRUE;
|
|
|
|
tmp = emission.state == EMISSION_RUN ? handler->next : NULL;
|
|
}
|
|
else
|
|
tmp = handler->next;
|
|
|
|
if (tmp)
|
|
handler_ref (tmp);
|
|
handler_unref_R (signal_id, instance, handler_list);
|
|
handler_list = handler;
|
|
handler = tmp;
|
|
}
|
|
while (handler);
|
|
|
|
if (emission.state == EMISSION_STOP)
|
|
goto EMIT_CLEANUP;
|
|
else if (emission.state == EMISSION_RESTART)
|
|
goto EMIT_RESTART;
|
|
}
|
|
|
|
emission.ihint.run_type = G_SIGNAL_RUN_LAST;
|
|
|
|
if ((node->flags & G_SIGNAL_RUN_LAST) && class_closure)
|
|
{
|
|
emission.state = EMISSION_RUN;
|
|
|
|
emission.chain_type = G_TYPE_FROM_INSTANCE (instance);
|
|
SIGNAL_UNLOCK ();
|
|
g_closure_invoke (class_closure,
|
|
return_accu,
|
|
node->n_params + 1,
|
|
instance_and_params,
|
|
&emission.ihint);
|
|
if (!accumulate (&emission.ihint, emission_return, &accu, accumulator) &&
|
|
emission.state == EMISSION_RUN)
|
|
emission.state = EMISSION_STOP;
|
|
SIGNAL_LOCK ();
|
|
emission.chain_type = G_TYPE_NONE;
|
|
return_value_altered = TRUE;
|
|
|
|
if (emission.state == EMISSION_STOP)
|
|
goto EMIT_CLEANUP;
|
|
else if (emission.state == EMISSION_RESTART)
|
|
goto EMIT_RESTART;
|
|
}
|
|
|
|
if (handler_list)
|
|
{
|
|
Handler *handler = handler_list;
|
|
|
|
emission.state = EMISSION_RUN;
|
|
handler_ref (handler);
|
|
do
|
|
{
|
|
Handler *tmp;
|
|
|
|
if (handler->after && !handler->block_count && (!handler->detail || handler->detail == detail) &&
|
|
handler->sequential_number < max_sequential_handler_number)
|
|
{
|
|
SIGNAL_UNLOCK ();
|
|
g_closure_invoke (handler->closure,
|
|
return_accu,
|
|
node->n_params + 1,
|
|
instance_and_params,
|
|
&emission.ihint);
|
|
if (!accumulate (&emission.ihint, emission_return, &accu, accumulator) &&
|
|
emission.state == EMISSION_RUN)
|
|
emission.state = EMISSION_STOP;
|
|
SIGNAL_LOCK ();
|
|
return_value_altered = TRUE;
|
|
|
|
tmp = emission.state == EMISSION_RUN ? handler->next : NULL;
|
|
}
|
|
else
|
|
tmp = handler->next;
|
|
|
|
if (tmp)
|
|
handler_ref (tmp);
|
|
handler_unref_R (signal_id, instance, handler);
|
|
handler = tmp;
|
|
}
|
|
while (handler);
|
|
|
|
if (emission.state == EMISSION_STOP)
|
|
goto EMIT_CLEANUP;
|
|
else if (emission.state == EMISSION_RESTART)
|
|
goto EMIT_RESTART;
|
|
}
|
|
|
|
EMIT_CLEANUP:
|
|
|
|
emission.ihint.run_type = G_SIGNAL_RUN_CLEANUP;
|
|
|
|
if ((node->flags & G_SIGNAL_RUN_CLEANUP) && class_closure)
|
|
{
|
|
gboolean need_unset = FALSE;
|
|
|
|
emission.state = EMISSION_STOP;
|
|
|
|
emission.chain_type = G_TYPE_FROM_INSTANCE (instance);
|
|
SIGNAL_UNLOCK ();
|
|
if (node->return_type != G_TYPE_NONE && !accumulator)
|
|
{
|
|
g_value_init (&accu, node->return_type & ~G_SIGNAL_TYPE_STATIC_SCOPE);
|
|
need_unset = TRUE;
|
|
}
|
|
g_closure_invoke (class_closure,
|
|
node->return_type != G_TYPE_NONE ? &accu : NULL,
|
|
node->n_params + 1,
|
|
instance_and_params,
|
|
&emission.ihint);
|
|
if (need_unset)
|
|
g_value_unset (&accu);
|
|
SIGNAL_LOCK ();
|
|
emission.chain_type = G_TYPE_NONE;
|
|
|
|
if (emission.state == EMISSION_RESTART)
|
|
goto EMIT_RESTART;
|
|
}
|
|
|
|
if (handler_list)
|
|
handler_unref_R (signal_id, instance, handler_list);
|
|
|
|
emission_pop ((node->flags & G_SIGNAL_NO_RECURSE) ? &g_restart_emissions : &g_recursive_emissions, &emission);
|
|
SIGNAL_UNLOCK ();
|
|
if (accumulator)
|
|
g_value_unset (&accu);
|
|
|
|
TRACE(GOBJECT_SIGNAL_EMIT_END(node->signal_id, detail, instance, G_TYPE_FROM_INSTANCE (instance)));
|
|
|
|
return return_value_altered;
|
|
}
|
|
|
|
static const gchar*
|
|
type_debug_name (GType type)
|
|
{
|
|
if (type)
|
|
{
|
|
const char *name = g_type_name (type & ~G_SIGNAL_TYPE_STATIC_SCOPE);
|
|
return name ? name : "<unknown>";
|
|
}
|
|
else
|
|
return "<invalid>";
|
|
}
|
|
|
|
/**
|
|
* g_signal_accumulator_true_handled:
|
|
* @ihint: standard #GSignalAccumulator parameter
|
|
* @return_accu: standard #GSignalAccumulator parameter
|
|
* @handler_return: standard #GSignalAccumulator parameter
|
|
* @dummy: standard #GSignalAccumulator parameter
|
|
*
|
|
* A predefined #GSignalAccumulator for signals that return a
|
|
* boolean values. The behavior that this accumulator gives is
|
|
* that a return of %TRUE stops the signal emission: no further
|
|
* callbacks will be invoked, while a return of %FALSE allows
|
|
* the emission to continue. The idea here is that a %TRUE return
|
|
* indicates that the callback <emphasis>handled</emphasis> the signal,
|
|
* and no further handling is needed.
|
|
*
|
|
* Since: 2.4
|
|
*
|
|
* Returns: standard #GSignalAccumulator result
|
|
*/
|
|
gboolean
|
|
g_signal_accumulator_true_handled (GSignalInvocationHint *ihint,
|
|
GValue *return_accu,
|
|
const GValue *handler_return,
|
|
gpointer dummy)
|
|
{
|
|
gboolean continue_emission;
|
|
gboolean signal_handled;
|
|
|
|
signal_handled = g_value_get_boolean (handler_return);
|
|
g_value_set_boolean (return_accu, signal_handled);
|
|
continue_emission = !signal_handled;
|
|
|
|
return continue_emission;
|
|
}
|
|
|
|
/**
|
|
* g_signal_accumulator_first_wins:
|
|
* @ihint: standard #GSignalAccumulator parameter
|
|
* @return_accu: standard #GSignalAccumulator parameter
|
|
* @handler_return: standard #GSignalAccumulator parameter
|
|
* @dummy: standard #GSignalAccumulator parameter
|
|
*
|
|
* A predefined #GSignalAccumulator for signals intended to be used as a
|
|
* hook for application code to provide a particular value. Usually
|
|
* only one such value is desired and multiple handlers for the same
|
|
* signal don't make much sense (except for the case of the default
|
|
* handler defined in the class structure, in which case you will
|
|
* usually want the signal connection to override the class handler).
|
|
*
|
|
* This accumulator will use the return value from the first signal
|
|
* handler that is run as the return value for the signal and not run
|
|
* any further handlers (ie: the first handler "wins").
|
|
*
|
|
* Returns: standard #GSignalAccumulator result
|
|
*
|
|
* Since: 2.28
|
|
**/
|
|
gboolean
|
|
g_signal_accumulator_first_wins (GSignalInvocationHint *ihint,
|
|
GValue *return_accu,
|
|
const GValue *handler_return,
|
|
gpointer dummy)
|
|
{
|
|
g_value_copy (handler_return, return_accu);
|
|
return FALSE;
|
|
}
|