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583 lines
23 KiB
C
583 lines
23 KiB
C
/* GObject - GLib Type, Object, Parameter and Signal Library
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* Copyright (C) 1998-1999, 2000-2001 Tim Janik and 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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#if !defined (__GLIB_GOBJECT_H_INSIDE__) && !defined (GOBJECT_COMPILATION)
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#error "Only <glib-object.h> can be included directly."
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#endif
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#ifndef __G_OBJECT_H__
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#define __G_OBJECT_H__
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#include <gobject/gtype.h>
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#include <gobject/gvalue.h>
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#include <gobject/gparam.h>
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#include <gobject/gclosure.h>
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#include <gobject/gsignal.h>
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G_BEGIN_DECLS
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/* --- type macros --- */
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/**
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* G_TYPE_IS_OBJECT:
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* @type: Type id to check
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*
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* Check if the passed in type id is a %G_TYPE_OBJECT or derived from it.
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*
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* Returns: %FALSE or %TRUE, indicating whether @type is a %G_TYPE_OBJECT.
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*/
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#define G_TYPE_IS_OBJECT(type) (G_TYPE_FUNDAMENTAL (type) == G_TYPE_OBJECT)
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/**
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* G_OBJECT:
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* @object: Object which is subject to casting.
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*
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* Casts a #GObject or derived pointer into a (GObject*) pointer.
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* Depending on the current debugging level, this function may invoke
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* certain runtime checks to identify invalid casts.
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*/
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#define G_OBJECT(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), G_TYPE_OBJECT, GObject))
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/**
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* G_OBJECT_CLASS:
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* @class: a valid #GObjectClass
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*
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* Casts a derived #GObjectClass structure into a #GObjectClass structure.
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*/
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#define G_OBJECT_CLASS(class) (G_TYPE_CHECK_CLASS_CAST ((class), G_TYPE_OBJECT, GObjectClass))
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/**
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* G_IS_OBJECT:
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* @object: Instance to check for being a %G_TYPE_OBJECT.
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*
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* Checks whether a valid #GTypeInstance pointer is of type %G_TYPE_OBJECT.
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*/
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#define G_IS_OBJECT(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), G_TYPE_OBJECT))
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/**
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* G_IS_OBJECT_CLASS:
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* @class: a #GObjectClass
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*
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* Checks whether @class "is a" valid #GObjectClass structure of type
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* %G_TYPE_OBJECT or derived.
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*/
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#define G_IS_OBJECT_CLASS(class) (G_TYPE_CHECK_CLASS_TYPE ((class), G_TYPE_OBJECT))
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/**
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* G_OBJECT_GET_CLASS:
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* @object: a #GObject instance.
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*
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* Get the class structure associated to a #GObject instance.
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*
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* Returns: pointer to object class structure.
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*/
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#define G_OBJECT_GET_CLASS(object) (G_TYPE_INSTANCE_GET_CLASS ((object), G_TYPE_OBJECT, GObjectClass))
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/**
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* G_OBJECT_TYPE:
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* @object: Object to return the type id for.
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*
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* Get the type id of an object.
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*
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* Returns: Type id of @object.
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*/
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#define G_OBJECT_TYPE(object) (G_TYPE_FROM_INSTANCE (object))
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/**
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* G_OBJECT_TYPE_NAME:
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* @object: Object to return the type name for.
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*
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* Get the name of an object's type.
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*
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* Returns: Type name of @object. The string is owned by the type system and
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* should not be freed.
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*/
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#define G_OBJECT_TYPE_NAME(object) (g_type_name (G_OBJECT_TYPE (object)))
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/**
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* G_OBJECT_CLASS_TYPE:
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* @class: a valid #GObjectClass
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*
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* Get the type id of a class structure.
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*
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* Returns: Type id of @class.
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*/
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#define G_OBJECT_CLASS_TYPE(class) (G_TYPE_FROM_CLASS (class))
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/**
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* G_OBJECT_CLASS_NAME:
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* @class: a valid #GObjectClass
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*
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* Return the name of a class structure's type.
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*
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* Returns: Type name of @class. The string is owned by the type system and
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* should not be freed.
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*/
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#define G_OBJECT_CLASS_NAME(class) (g_type_name (G_OBJECT_CLASS_TYPE (class)))
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/**
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* G_VALUE_HOLDS_OBJECT:
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* @value: a valid #GValue structure
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*
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* Checks whether the given #GValue can hold values derived from type %G_TYPE_OBJECT.
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*
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* Returns: %TRUE on success.
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*/
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#define G_VALUE_HOLDS_OBJECT(value) (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_OBJECT))
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/* --- type macros --- */
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/**
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* G_TYPE_INITIALLY_UNOWNED:
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*
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* The type for #GInitiallyUnowned.
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*/
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#define G_TYPE_INITIALLY_UNOWNED (g_initially_unowned_get_type())
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/**
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* G_INITIALLY_UNOWNED:
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* @object: Object which is subject to casting.
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*
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* Casts a #GInitiallyUnowned or derived pointer into a (GInitiallyUnowned*)
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* pointer. Depending on the current debugging level, this function may invoke
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* certain runtime checks to identify invalid casts.
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*/
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#define G_INITIALLY_UNOWNED(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), G_TYPE_INITIALLY_UNOWNED, GInitiallyUnowned))
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/**
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* G_INITIALLY_UNOWNED_CLASS:
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* @class: a valid #GInitiallyUnownedClass
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*
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* Casts a derived #GInitiallyUnownedClass structure into a
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* #GInitiallyUnownedClass structure.
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*/
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#define G_INITIALLY_UNOWNED_CLASS(class) (G_TYPE_CHECK_CLASS_CAST ((class), G_TYPE_INITIALLY_UNOWNED, GInitiallyUnownedClass))
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/**
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* G_IS_INITIALLY_UNOWNED:
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* @object: Instance to check for being a %G_TYPE_INITIALLY_UNOWNED.
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*
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* Checks whether a valid #GTypeInstance pointer is of type %G_TYPE_INITIALLY_UNOWNED.
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*/
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#define G_IS_INITIALLY_UNOWNED(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), G_TYPE_INITIALLY_UNOWNED))
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/**
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* G_IS_INITIALLY_UNOWNED_CLASS:
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* @class: a #GInitiallyUnownedClass
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*
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* Checks whether @class "is a" valid #GInitiallyUnownedClass structure of type
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* %G_TYPE_INITIALLY_UNOWNED or derived.
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*/
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#define G_IS_INITIALLY_UNOWNED_CLASS(class) (G_TYPE_CHECK_CLASS_TYPE ((class), G_TYPE_INITIALLY_UNOWNED))
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/**
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* G_INITIALLY_UNOWNED_GET_CLASS:
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* @object: a #GInitiallyUnowned instance.
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*
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* Get the class structure associated to a #GInitiallyUnowned instance.
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*
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* Returns: pointer to object class structure.
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*/
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#define G_INITIALLY_UNOWNED_GET_CLASS(object) (G_TYPE_INSTANCE_GET_CLASS ((object), G_TYPE_INITIALLY_UNOWNED, GInitiallyUnownedClass))
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/* GInitiallyUnowned ia a GObject with initially floating reference count */
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/* --- typedefs & structures --- */
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typedef struct _GObject GObject;
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typedef struct _GObjectClass GObjectClass;
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typedef struct _GObject GInitiallyUnowned;
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typedef struct _GObjectClass GInitiallyUnownedClass;
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typedef struct _GObjectConstructParam GObjectConstructParam;
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/**
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* GObjectGetPropertyFunc:
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* @object: a #GObject
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* @property_id: the numeric id under which the property was registered with
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* g_object_class_install_property().
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* @value: a #GValue to return the property value in
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* @pspec: the #GParamSpec describing the property
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*
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* The type of the @get_property function of #GObjectClass.
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*/
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typedef void (*GObjectGetPropertyFunc) (GObject *object,
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guint property_id,
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GValue *value,
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GParamSpec *pspec);
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/**
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* GObjectSetPropertyFunc:
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* @object: a #GObject
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* @property_id: the numeric id under which the property was registered with
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* g_object_class_install_property().
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* @value: the new value for the property
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* @pspec: the #GParamSpec describing the property
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*
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* The type of the @set_property function of #GObjectClass.
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*/
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typedef void (*GObjectSetPropertyFunc) (GObject *object,
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guint property_id,
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const GValue *value,
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GParamSpec *pspec);
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/**
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* GObjectFinalizeFunc:
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* @object: the #GObject being finalized
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*
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* The type of the @finalize function of #GObjectClass.
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*/
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typedef void (*GObjectFinalizeFunc) (GObject *object);
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/**
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* GWeakNotify:
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* @data: data that was provided when the weak reference was established
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* @where_the_object_was: the object being finalized
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*
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* A #GWeakNotify function can be added to an object as a callback that gets
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* triggered when the object is finalized. Since the object is already being
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* finalized when the #GWeakNotify is called, there's not much you could do
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* with the object, apart from e.g. using its address as hash-index or the like.
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*/
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typedef void (*GWeakNotify) (gpointer data,
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GObject *where_the_object_was);
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/**
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* GObject:
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*
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* All the fields in the <structname>GObject</structname> structure are private
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* to the #GObject implementation and should never be accessed directly.
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*/
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struct _GObject
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{
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GTypeInstance g_type_instance;
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/*< private >*/
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volatile guint ref_count;
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GData *qdata;
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};
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/**
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* GObjectClass:
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* @g_type_class: the parent class
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* @constructor: the @constructor function is called by g_object_new () to
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* complete the object initialization after all the construction properties are
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* set. The first thing a @constructor implementation must do is chain up to the
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* @constructor of the parent class. Overriding @constructor should be rarely
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* needed, e.g. to handle construct properties, or to implement singletons.
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* @set_property: the generic setter for all properties of this type. Should be
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* overridden for every type with properties. Implementations of @set_property
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* don't need to emit property change notification explicitly, this is handled
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* by the type system.
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* @get_property: the generic getter for all properties of this type. Should be
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* overridden for every type with properties.
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* @dispose: the @dispose function is supposed to drop all references to other
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* objects, but keep the instance otherwise intact, so that client method
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* invocations still work. It may be run multiple times (due to reference
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* loops). Before returning, @dispose should chain up to the @dispose method
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* of the parent class.
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* @finalize: instance finalization function, should finish the finalization of
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* the instance begun in @dispose and chain up to the @finalize method of the
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* parent class.
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* @dispatch_properties_changed: emits property change notification for a bunch
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* of properties. Overriding @dispatch_properties_changed should be rarely
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* needed.
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* @notify: the class closure for the notify signal
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* @constructed: the @constructed function is called by g_object_new() as the
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* final step of the object creation process. At the point of the call, all
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* construction properties have been set on the object. The purpose of this
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* call is to allow for object initialisation steps that can only be performed
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* after construction properties have been set. @constructed implementors
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* should chain up to the @constructed call of their parent class to allow it
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* to complete its initialisation.
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*
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* The class structure for the <structname>GObject</structname> type.
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*
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* <example>
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* <title>Implementing singletons using a constructor</title>
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* <programlisting>
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* static MySingleton *the_singleton = NULL;
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*
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* static GObject*
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* my_singleton_constructor (GType type,
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* guint n_construct_params,
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* GObjectConstructParam *construct_params)
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* {
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* GObject *object;
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*
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* if (!the_singleton)
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* {
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* object = G_OBJECT_CLASS (parent_class)->constructor (type,
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* n_construct_params,
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* construct_params);
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* the_singleton = MY_SINGLETON (object);
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* }
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* else
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* object = g_object_ref (G_OBJECT (the_singleton));
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*
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* return object;
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* }
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* </programlisting></example>
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*/
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struct _GObjectClass
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{
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GTypeClass g_type_class;
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/*< private >*/
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GSList *construct_properties;
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/*< public >*/
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/* seldom overidden */
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GObject* (*constructor) (GType type,
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guint n_construct_properties,
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GObjectConstructParam *construct_properties);
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/* overridable methods */
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void (*set_property) (GObject *object,
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guint property_id,
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const GValue *value,
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GParamSpec *pspec);
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void (*get_property) (GObject *object,
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guint property_id,
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GValue *value,
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GParamSpec *pspec);
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void (*dispose) (GObject *object);
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void (*finalize) (GObject *object);
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/* seldom overidden */
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void (*dispatch_properties_changed) (GObject *object,
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guint n_pspecs,
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GParamSpec **pspecs);
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/* signals */
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void (*notify) (GObject *object,
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GParamSpec *pspec);
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/* called when done constructing */
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void (*constructed) (GObject *object);
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/*< private >*/
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gsize flags;
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/* padding */
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gpointer pdummy[6];
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};
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/**
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* GObjectConstructParam:
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* @pspec: the #GParamSpec of the construct parameter
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* @value: the value to set the parameter to
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*
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* The <structname>GObjectConstructParam</structname> struct is an auxiliary
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* structure used to hand #GParamSpec/#GValue pairs to the @constructor of
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* a #GObjectClass.
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*/
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struct _GObjectConstructParam
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{
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GParamSpec *pspec;
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GValue *value;
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};
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/**
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* GInitiallyUnowned:
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*
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* All the fields in the <structname>GInitiallyUnowned</structname> structure
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* are private to the #GInitiallyUnowned implementation and should never be
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* accessed directly.
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*/
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/**
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* GInitiallyUnownedClass:
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*
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* The class structure for the <structname>GInitiallyUnowned</structname> type.
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*/
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/* --- prototypes --- */
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GType g_initially_unowned_get_type (void);
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void g_object_class_install_property (GObjectClass *oclass,
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guint property_id,
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GParamSpec *pspec);
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GParamSpec* g_object_class_find_property (GObjectClass *oclass,
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const gchar *property_name);
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GParamSpec**g_object_class_list_properties (GObjectClass *oclass,
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guint *n_properties);
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void g_object_class_override_property (GObjectClass *oclass,
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guint property_id,
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const gchar *name);
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void g_object_class_install_properties (GObjectClass *oclass,
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guint n_pspecs,
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GParamSpec **pspecs);
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void g_object_interface_install_property (gpointer g_iface,
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GParamSpec *pspec);
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GParamSpec* g_object_interface_find_property (gpointer g_iface,
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const gchar *property_name);
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GParamSpec**g_object_interface_list_properties (gpointer g_iface,
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guint *n_properties_p);
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GType g_object_get_type (void) G_GNUC_CONST;
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gpointer g_object_new (GType object_type,
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const gchar *first_property_name,
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...);
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gpointer g_object_newv (GType object_type,
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guint n_parameters,
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GParameter *parameters);
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GObject* g_object_new_valist (GType object_type,
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const gchar *first_property_name,
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va_list var_args);
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void g_object_set (gpointer object,
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const gchar *first_property_name,
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...) G_GNUC_NULL_TERMINATED;
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void g_object_get (gpointer object,
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const gchar *first_property_name,
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...) G_GNUC_NULL_TERMINATED;
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gpointer g_object_connect (gpointer object,
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const gchar *signal_spec,
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...) G_GNUC_NULL_TERMINATED;
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void g_object_disconnect (gpointer object,
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const gchar *signal_spec,
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...) G_GNUC_NULL_TERMINATED;
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void g_object_set_valist (GObject *object,
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const gchar *first_property_name,
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va_list var_args);
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void g_object_get_valist (GObject *object,
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const gchar *first_property_name,
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va_list var_args);
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void g_object_set_property (GObject *object,
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const gchar *property_name,
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const GValue *value);
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void g_object_get_property (GObject *object,
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const gchar *property_name,
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GValue *value);
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void g_object_freeze_notify (GObject *object);
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void g_object_notify (GObject *object,
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const gchar *property_name);
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void g_object_notify_by_pspec (GObject *object,
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GParamSpec *pspec);
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void g_object_thaw_notify (GObject *object);
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gboolean g_object_is_floating (gpointer object);
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gpointer g_object_ref_sink (gpointer object);
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gpointer g_object_ref (gpointer object);
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void g_object_unref (gpointer object);
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void g_object_weak_ref (GObject *object,
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GWeakNotify notify,
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gpointer data);
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void g_object_weak_unref (GObject *object,
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GWeakNotify notify,
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gpointer data);
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void g_object_add_weak_pointer (GObject *object,
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gpointer *weak_pointer_location);
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void g_object_remove_weak_pointer (GObject *object,
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gpointer *weak_pointer_location);
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/**
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* GToggleNotify:
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* @data: Callback data passed to g_object_add_toggle_ref()
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* @object: The object on which g_object_add_toggle_ref() was called.
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* @is_last_ref: %TRUE if the toggle reference is now the
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* last reference to the object. %FALSE if the toggle
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* reference was the last reference and there are now other
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* references.
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*
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* A callback function used for notification when the state
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* of a toggle reference changes. See g_object_add_toggle_ref().
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|
*/
|
|
typedef void (*GToggleNotify) (gpointer data,
|
|
GObject *object,
|
|
gboolean is_last_ref);
|
|
|
|
void g_object_add_toggle_ref (GObject *object,
|
|
GToggleNotify notify,
|
|
gpointer data);
|
|
void g_object_remove_toggle_ref (GObject *object,
|
|
GToggleNotify notify,
|
|
gpointer data);
|
|
|
|
gpointer g_object_get_qdata (GObject *object,
|
|
GQuark quark);
|
|
void g_object_set_qdata (GObject *object,
|
|
GQuark quark,
|
|
gpointer data);
|
|
void g_object_set_qdata_full (GObject *object,
|
|
GQuark quark,
|
|
gpointer data,
|
|
GDestroyNotify destroy);
|
|
gpointer g_object_steal_qdata (GObject *object,
|
|
GQuark quark);
|
|
gpointer g_object_get_data (GObject *object,
|
|
const gchar *key);
|
|
void g_object_set_data (GObject *object,
|
|
const gchar *key,
|
|
gpointer data);
|
|
void g_object_set_data_full (GObject *object,
|
|
const gchar *key,
|
|
gpointer data,
|
|
GDestroyNotify destroy);
|
|
gpointer g_object_steal_data (GObject *object,
|
|
const gchar *key);
|
|
void g_object_watch_closure (GObject *object,
|
|
GClosure *closure);
|
|
GClosure* g_cclosure_new_object (GCallback callback_func,
|
|
GObject *object);
|
|
GClosure* g_cclosure_new_object_swap (GCallback callback_func,
|
|
GObject *object);
|
|
GClosure* g_closure_new_object (guint sizeof_closure,
|
|
GObject *object);
|
|
void g_value_set_object (GValue *value,
|
|
gpointer v_object);
|
|
gpointer g_value_get_object (const GValue *value);
|
|
gpointer g_value_dup_object (const GValue *value);
|
|
gulong g_signal_connect_object (gpointer instance,
|
|
const gchar *detailed_signal,
|
|
GCallback c_handler,
|
|
gpointer gobject,
|
|
GConnectFlags connect_flags);
|
|
|
|
/*< protected >*/
|
|
void g_object_force_floating (GObject *object);
|
|
void g_object_run_dispose (GObject *object);
|
|
|
|
|
|
void g_value_take_object (GValue *value,
|
|
gpointer v_object);
|
|
#ifndef G_DISABLE_DEPRECATED
|
|
void g_value_set_object_take_ownership (GValue *value,
|
|
gpointer v_object);
|
|
#endif
|
|
|
|
#if !defined(G_DISABLE_DEPRECATED) || defined(GTK_COMPILATION)
|
|
gsize g_object_compat_control (gsize what,
|
|
gpointer data);
|
|
#endif
|
|
|
|
/* --- implementation macros --- */
|
|
#define G_OBJECT_WARN_INVALID_PSPEC(object, pname, property_id, pspec) \
|
|
G_STMT_START { \
|
|
GObject *_object = (GObject*) (object); \
|
|
GParamSpec *_pspec = (GParamSpec*) (pspec); \
|
|
guint _property_id = (property_id); \
|
|
g_warning ("%s: invalid %s id %u for \"%s\" of type `%s' in `%s'", \
|
|
G_STRLOC, \
|
|
(pname), \
|
|
_property_id, \
|
|
_pspec->name, \
|
|
g_type_name (G_PARAM_SPEC_TYPE (_pspec)), \
|
|
G_OBJECT_TYPE_NAME (_object)); \
|
|
} G_STMT_END
|
|
/**
|
|
* G_OBJECT_WARN_INVALID_PROPERTY_ID:
|
|
* @object: the #GObject on which set_property() or get_property() was called
|
|
* @property_id: the numeric id of the property
|
|
* @pspec: the #GParamSpec of the property
|
|
*
|
|
* This macro should be used to emit a standard warning about unexpected
|
|
* properties in set_property() and get_property() implementations.
|
|
*/
|
|
#define G_OBJECT_WARN_INVALID_PROPERTY_ID(object, property_id, pspec) \
|
|
G_OBJECT_WARN_INVALID_PSPEC ((object), "property", (property_id), (pspec))
|
|
|
|
void g_clear_object (volatile GObject **object_ptr);
|
|
#define g_clear_object(object_ptr) \
|
|
G_STMT_START { \
|
|
/* Only one access, please */ \
|
|
gpointer *_p = (gpointer) (object_ptr); \
|
|
gpointer _o; \
|
|
\
|
|
do \
|
|
_o = g_atomic_pointer_get (_p); \
|
|
while G_UNLIKELY (!g_atomic_pointer_compare_and_exchange (_p, _o, NULL));\
|
|
\
|
|
if (_o) \
|
|
g_object_unref (_o); \
|
|
} G_STMT_END
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __G_OBJECT_H__ */
|