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https://gitlab.gnome.org/GNOME/glib.git
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c1fcc7be49
The docs for the constructed vfunc make it clear that when called constructed properties are already set. However, the first place where a user would look for is the flag's documentation.
470 lines
17 KiB
C
470 lines
17 KiB
C
/* GObject - GLib Type, Object, Parameter and Signal Library
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* Copyright (C) 1997-1999, 2000-2001 Tim Janik and Red Hat, Inc.
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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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 2.1 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, see <http://www.gnu.org/licenses/>.
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*
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* gparam.h: GParamSpec base class implementation
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*/
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#ifndef __G_PARAM_H__
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#define __G_PARAM_H__
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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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#include <gobject/gvalue.h>
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G_BEGIN_DECLS
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/* --- standard type macros --- */
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/**
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* G_TYPE_IS_PARAM:
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* @type: a #GType ID
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*
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* Checks whether @type "is a" %G_TYPE_PARAM.
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*/
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#define G_TYPE_IS_PARAM(type) (G_TYPE_FUNDAMENTAL (type) == G_TYPE_PARAM)
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/**
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* G_PARAM_SPEC:
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* @pspec: a valid #GParamSpec
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*
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* Casts a derived #GParamSpec object (e.g. of type #GParamSpecInt) into
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* a #GParamSpec object.
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*/
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#define G_PARAM_SPEC(pspec) (G_TYPE_CHECK_INSTANCE_CAST ((pspec), G_TYPE_PARAM, GParamSpec))
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/**
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* G_IS_PARAM_SPEC:
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* @pspec: a #GParamSpec
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*
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* Checks whether @pspec "is a" valid #GParamSpec structure of type %G_TYPE_PARAM
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* or derived.
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*/
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#if GLIB_VERSION_MAX_ALLOWED >= GLIB_VERSION_2_42
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#define G_IS_PARAM_SPEC(pspec) (G_TYPE_CHECK_INSTANCE_FUNDAMENTAL_TYPE ((pspec), G_TYPE_PARAM))
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#else
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#define G_IS_PARAM_SPEC(pspec) (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM))
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#endif
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/**
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* G_PARAM_SPEC_CLASS:
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* @pclass: a valid #GParamSpecClass
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*
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* Casts a derived #GParamSpecClass structure into a #GParamSpecClass structure.
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*/
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#define G_PARAM_SPEC_CLASS(pclass) (G_TYPE_CHECK_CLASS_CAST ((pclass), G_TYPE_PARAM, GParamSpecClass))
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/**
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* G_IS_PARAM_SPEC_CLASS:
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* @pclass: a #GParamSpecClass
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*
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* Checks whether @pclass "is a" valid #GParamSpecClass structure of type
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* %G_TYPE_PARAM or derived.
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*/
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#define G_IS_PARAM_SPEC_CLASS(pclass) (G_TYPE_CHECK_CLASS_TYPE ((pclass), G_TYPE_PARAM))
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/**
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* G_PARAM_SPEC_GET_CLASS:
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* @pspec: a valid #GParamSpec
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*
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* Retrieves the #GParamSpecClass of a #GParamSpec.
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*/
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#define G_PARAM_SPEC_GET_CLASS(pspec) (G_TYPE_INSTANCE_GET_CLASS ((pspec), G_TYPE_PARAM, GParamSpecClass))
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/* --- convenience macros --- */
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/**
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* G_PARAM_SPEC_TYPE:
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* @pspec: a valid #GParamSpec
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*
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* Retrieves the #GType of this @pspec.
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*/
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#define G_PARAM_SPEC_TYPE(pspec) (G_TYPE_FROM_INSTANCE (pspec))
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/**
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* G_PARAM_SPEC_TYPE_NAME:
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* @pspec: a valid #GParamSpec
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*
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* Retrieves the #GType name of this @pspec.
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*/
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#define G_PARAM_SPEC_TYPE_NAME(pspec) (g_type_name (G_PARAM_SPEC_TYPE (pspec)))
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/**
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* G_PARAM_SPEC_VALUE_TYPE:
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* @pspec: a valid #GParamSpec
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*
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* Retrieves the #GType to initialize a #GValue for this parameter.
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*/
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#define G_PARAM_SPEC_VALUE_TYPE(pspec) (G_PARAM_SPEC (pspec)->value_type)
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/**
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* G_VALUE_HOLDS_PARAM:
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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_PARAM.
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*
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* Returns: %TRUE on success.
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*/
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#define G_VALUE_HOLDS_PARAM(value) (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_PARAM))
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/* --- flags --- */
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/**
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* GParamFlags:
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* @G_PARAM_READABLE: the parameter is readable
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* @G_PARAM_WRITABLE: the parameter is writable
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* @G_PARAM_READWRITE: alias for %G_PARAM_READABLE | %G_PARAM_WRITABLE
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* @G_PARAM_CONSTRUCT: the parameter will be set upon object construction.
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* See [vfunc@Object.constructed] for more details
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* @G_PARAM_CONSTRUCT_ONLY: the parameter can only be set upon object construction.
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* See [vfunc@Object.constructed] for more details
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* @G_PARAM_LAX_VALIDATION: upon parameter conversion (see g_param_value_convert())
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* strict validation is not required
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* @G_PARAM_STATIC_NAME: the string used as name when constructing the
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* parameter is guaranteed to remain valid and
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* unmodified for the lifetime of the parameter.
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* Since 2.8
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* @G_PARAM_STATIC_NICK: the string used as nick when constructing the
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* parameter is guaranteed to remain valid and
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* unmmodified for the lifetime of the parameter.
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* Since 2.8
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* @G_PARAM_STATIC_BLURB: the string used as blurb when constructing the
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* parameter is guaranteed to remain valid and
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* unmodified for the lifetime of the parameter.
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* Since 2.8
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* @G_PARAM_EXPLICIT_NOTIFY: calls to g_object_set_property() for this
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* property will not automatically result in a "notify" signal being
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* emitted: the implementation must call g_object_notify() themselves
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* in case the property actually changes. Since: 2.42.
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* @G_PARAM_PRIVATE: internal
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* @G_PARAM_DEPRECATED: the parameter is deprecated and will be removed
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* in a future version. A warning will be generated if it is used
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* while running with G_ENABLE_DIAGNOSTIC=1.
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* Since 2.26
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*
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* Through the #GParamFlags flag values, certain aspects of parameters
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* can be configured.
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*
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* See also: %G_PARAM_STATIC_STRINGS
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*/
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typedef enum
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{
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G_PARAM_READABLE = 1 << 0,
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G_PARAM_WRITABLE = 1 << 1,
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G_PARAM_READWRITE = (G_PARAM_READABLE | G_PARAM_WRITABLE),
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G_PARAM_CONSTRUCT = 1 << 2,
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G_PARAM_CONSTRUCT_ONLY = 1 << 3,
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G_PARAM_LAX_VALIDATION = 1 << 4,
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G_PARAM_STATIC_NAME = 1 << 5,
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G_PARAM_PRIVATE GOBJECT_DEPRECATED_ENUMERATOR_IN_2_26 = G_PARAM_STATIC_NAME,
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G_PARAM_STATIC_NICK = 1 << 6,
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G_PARAM_STATIC_BLURB = 1 << 7,
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/* User defined flags go here */
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G_PARAM_EXPLICIT_NOTIFY = 1 << 30,
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/* Avoid warning with -Wpedantic for gcc6 */
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G_PARAM_DEPRECATED = (gint)(1u << 31)
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} GParamFlags;
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/**
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* G_PARAM_STATIC_STRINGS:
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*
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* #GParamFlags value alias for %G_PARAM_STATIC_NAME | %G_PARAM_STATIC_NICK | %G_PARAM_STATIC_BLURB.
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*
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* It is recommended to use this for all properties by default, as it allows for
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* internal performance improvements in GObject.
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*
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* It is very rare that a property would have a dynamically constructed name,
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* nickname or blurb.
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*
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* Since 2.13.0
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*/
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#define G_PARAM_STATIC_STRINGS (G_PARAM_STATIC_NAME | G_PARAM_STATIC_NICK | G_PARAM_STATIC_BLURB)
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/* bits in the range 0xffffff00 are reserved for 3rd party usage */
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/**
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* G_PARAM_MASK:
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*
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* Mask containing the bits of #GParamSpec.flags which are reserved for GLib.
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*/
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#define G_PARAM_MASK (0x000000ff)
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/**
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* G_PARAM_USER_SHIFT:
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*
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* Minimum shift count to be used for user defined flags, to be stored in
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* #GParamSpec.flags. The maximum allowed is 10.
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*/
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#define G_PARAM_USER_SHIFT (8)
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/* --- typedefs & structures --- */
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typedef struct _GParamSpec GParamSpec;
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typedef struct _GParamSpecClass GParamSpecClass;
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typedef struct _GParameter GParameter GOBJECT_DEPRECATED_TYPE_IN_2_54;
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typedef struct _GParamSpecPool GParamSpecPool;
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struct _GParamSpec
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{
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GTypeInstance g_type_instance;
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const gchar *name; /* interned string */
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GParamFlags flags;
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GType value_type;
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GType owner_type; /* class or interface using this property */
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/*< private >*/
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gchar *_nick;
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gchar *_blurb;
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GData *qdata;
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guint ref_count;
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guint param_id; /* sort-criteria */
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};
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/**
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* GParamSpecClass:
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* @g_type_class: the parent class
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* @value_type: the #GValue type for this parameter
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* @finalize: The instance finalization function (optional), should chain
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* up to the finalize method of the parent class.
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* @value_set_default: Resets a @value to the default value for this type
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* (recommended, the default is g_value_reset()), see
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* g_param_value_set_default().
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* @value_validate: Ensures that the contents of @value comply with the
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* specifications set out by this type (optional), see
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* g_param_value_validate().
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* @values_cmp: Compares @value1 with @value2 according to this type
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* (recommended, the default is memcmp()), see g_param_values_cmp().
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* @value_is_valid: Checks if contents of @value comply with the specifications
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* set out by this type, without modifying the value. This vfunc is optional.
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* If it isn't set, GObject will use @value_validate. Since 2.74
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*
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* The class structure for the GParamSpec type.
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* Normally, GParamSpec classes are filled by
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* g_param_type_register_static().
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*/
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struct _GParamSpecClass
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{
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GTypeClass g_type_class;
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GType value_type;
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void (*finalize) (GParamSpec *pspec);
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/* GParam methods */
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void (*value_set_default) (GParamSpec *pspec,
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GValue *value);
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gboolean (*value_validate) (GParamSpec *pspec,
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GValue *value);
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gint (*values_cmp) (GParamSpec *pspec,
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const GValue *value1,
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const GValue *value2);
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gboolean (*value_is_valid) (GParamSpec *pspec,
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const GValue *value);
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/*< private >*/
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gpointer dummy[3];
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};
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/**
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* GParameter:
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* @name: the parameter name
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* @value: the parameter value
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*
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* The GParameter struct is an auxiliary structure used
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* to hand parameter name/value pairs to g_object_newv().
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*
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* Deprecated: 2.54: This type is not introspectable.
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*/
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struct _GParameter /* auxiliary structure for _setv() variants */
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{
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const gchar *name;
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GValue value;
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} GOBJECT_DEPRECATED_TYPE_IN_2_54;
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/* --- prototypes --- */
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GOBJECT_AVAILABLE_IN_ALL
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GParamSpec* g_param_spec_ref (GParamSpec *pspec);
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GOBJECT_AVAILABLE_IN_ALL
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void g_param_spec_unref (GParamSpec *pspec);
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GOBJECT_AVAILABLE_IN_ALL
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void g_param_spec_sink (GParamSpec *pspec);
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GOBJECT_AVAILABLE_IN_ALL
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GParamSpec* g_param_spec_ref_sink (GParamSpec *pspec);
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GOBJECT_AVAILABLE_IN_ALL
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gpointer g_param_spec_get_qdata (GParamSpec *pspec,
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GQuark quark);
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GOBJECT_AVAILABLE_IN_ALL
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void g_param_spec_set_qdata (GParamSpec *pspec,
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GQuark quark,
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gpointer data);
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GOBJECT_AVAILABLE_IN_ALL
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void g_param_spec_set_qdata_full (GParamSpec *pspec,
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GQuark quark,
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gpointer data,
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GDestroyNotify destroy);
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GOBJECT_AVAILABLE_IN_ALL
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gpointer g_param_spec_steal_qdata (GParamSpec *pspec,
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GQuark quark);
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GOBJECT_AVAILABLE_IN_ALL
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GParamSpec* g_param_spec_get_redirect_target (GParamSpec *pspec);
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GOBJECT_AVAILABLE_IN_ALL
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void g_param_value_set_default (GParamSpec *pspec,
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GValue *value);
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GOBJECT_AVAILABLE_IN_ALL
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gboolean g_param_value_defaults (GParamSpec *pspec,
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const GValue *value);
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GOBJECT_AVAILABLE_IN_ALL
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gboolean g_param_value_validate (GParamSpec *pspec,
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GValue *value);
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GOBJECT_AVAILABLE_IN_2_74
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gboolean g_param_value_is_valid (GParamSpec *pspec,
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const GValue *value);
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GOBJECT_AVAILABLE_IN_ALL
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gboolean g_param_value_convert (GParamSpec *pspec,
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const GValue *src_value,
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GValue *dest_value,
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gboolean strict_validation);
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GOBJECT_AVAILABLE_IN_ALL
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gint g_param_values_cmp (GParamSpec *pspec,
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const GValue *value1,
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const GValue *value2);
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GOBJECT_AVAILABLE_IN_ALL
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const gchar * g_param_spec_get_name (GParamSpec *pspec);
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GOBJECT_AVAILABLE_IN_ALL
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const gchar * g_param_spec_get_nick (GParamSpec *pspec);
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GOBJECT_AVAILABLE_IN_ALL
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const gchar * g_param_spec_get_blurb (GParamSpec *pspec);
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GOBJECT_AVAILABLE_IN_ALL
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void g_value_set_param (GValue *value,
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GParamSpec *param);
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GOBJECT_AVAILABLE_IN_ALL
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GParamSpec* g_value_get_param (const GValue *value);
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GOBJECT_AVAILABLE_IN_ALL
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GParamSpec* g_value_dup_param (const GValue *value);
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GOBJECT_AVAILABLE_IN_ALL
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void g_value_take_param (GValue *value,
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GParamSpec *param);
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GOBJECT_DEPRECATED_FOR(g_value_take_param)
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void g_value_set_param_take_ownership (GValue *value,
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GParamSpec *param);
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GOBJECT_AVAILABLE_IN_2_36
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const GValue * g_param_spec_get_default_value (GParamSpec *pspec);
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GOBJECT_AVAILABLE_IN_2_46
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GQuark g_param_spec_get_name_quark (GParamSpec *pspec);
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/* --- convenience functions --- */
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typedef struct _GParamSpecTypeInfo GParamSpecTypeInfo;
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/**
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* GParamSpecTypeInfo:
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* @instance_size: Size of the instance (object) structure.
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* @n_preallocs: Prior to GLib 2.10, it specified the number of pre-allocated (cached) instances to reserve memory for (0 indicates no caching). Since GLib 2.10, it is ignored, since instances are allocated with the [slice allocator][glib-Memory-Slices] now.
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* @instance_init: Location of the instance initialization function (optional).
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* @value_type: The #GType of values conforming to this #GParamSpec
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* @finalize: The instance finalization function (optional).
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* @value_set_default: Resets a @value to the default value for @pspec
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* (recommended, the default is g_value_reset()), see
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* g_param_value_set_default().
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* @value_validate: Ensures that the contents of @value comply with the
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* specifications set out by @pspec (optional), see
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* g_param_value_validate().
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* @values_cmp: Compares @value1 with @value2 according to @pspec
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* (recommended, the default is memcmp()), see g_param_values_cmp().
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*
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* This structure is used to provide the type system with the information
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* required to initialize and destruct (finalize) a parameter's class and
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* instances thereof.
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*
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* The initialized structure is passed to the g_param_type_register_static()
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* The type system will perform a deep copy of this structure, so its memory
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* does not need to be persistent across invocation of
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* g_param_type_register_static().
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*/
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struct _GParamSpecTypeInfo
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{
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/* type system portion */
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guint16 instance_size; /* obligatory */
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guint16 n_preallocs; /* optional */
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void (*instance_init) (GParamSpec *pspec); /* optional */
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/* class portion */
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GType value_type; /* obligatory */
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void (*finalize) (GParamSpec *pspec); /* optional */
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void (*value_set_default) (GParamSpec *pspec, /* recommended */
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GValue *value);
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gboolean (*value_validate) (GParamSpec *pspec, /* optional */
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GValue *value);
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gint (*values_cmp) (GParamSpec *pspec, /* recommended */
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const GValue *value1,
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const GValue *value2);
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};
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GOBJECT_AVAILABLE_IN_ALL
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GType g_param_type_register_static (const gchar *name,
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const GParamSpecTypeInfo *pspec_info);
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GOBJECT_AVAILABLE_IN_2_66
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gboolean g_param_spec_is_valid_name (const gchar *name);
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/* For registering builting types */
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GType _g_param_type_register_static_constant (const gchar *name,
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const GParamSpecTypeInfo *pspec_info,
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GType opt_type);
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/* --- protected --- */
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GOBJECT_AVAILABLE_IN_ALL
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gpointer g_param_spec_internal (GType param_type,
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const gchar *name,
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const gchar *nick,
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const gchar *blurb,
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GParamFlags flags);
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GOBJECT_AVAILABLE_IN_ALL
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GParamSpecPool* g_param_spec_pool_new (gboolean type_prefixing);
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GOBJECT_AVAILABLE_IN_ALL
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void g_param_spec_pool_insert (GParamSpecPool *pool,
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GParamSpec *pspec,
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GType owner_type);
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GOBJECT_AVAILABLE_IN_ALL
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void g_param_spec_pool_remove (GParamSpecPool *pool,
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GParamSpec *pspec);
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GOBJECT_AVAILABLE_IN_ALL
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GParamSpec* g_param_spec_pool_lookup (GParamSpecPool *pool,
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const gchar *param_name,
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GType owner_type,
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gboolean walk_ancestors);
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GOBJECT_AVAILABLE_IN_ALL
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GList* g_param_spec_pool_list_owned (GParamSpecPool *pool,
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GType owner_type);
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GOBJECT_AVAILABLE_IN_ALL
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GParamSpec** g_param_spec_pool_list (GParamSpecPool *pool,
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GType owner_type,
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guint *n_pspecs_p);
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GOBJECT_AVAILABLE_IN_2_80
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void g_param_spec_pool_free (GParamSpecPool *pool);
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/* contracts:
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|
*
|
|
* gboolean value_validate (GParamSpec *pspec,
|
|
* GValue *value):
|
|
* modify value contents in the least destructive way, so
|
|
* that it complies with pspec's requirements (i.e.
|
|
* according to minimum/maximum ranges etc...). return
|
|
* whether modification was necessary.
|
|
*
|
|
* gint values_cmp (GParamSpec *pspec,
|
|
* const GValue *value1,
|
|
* const GValue *value2):
|
|
* return value1 - value2, i.e. (-1) if value1 < value2,
|
|
* (+1) if value1 > value2, and (0) otherwise (equality)
|
|
*/
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|
|
|
G_END_DECLS
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|
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|
#endif /* __G_PARAM_H__ */
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