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glib/gio/gsettings.c
Matthias Clasen 41f4aba2d2 Chain up in g_settings_finalize 
Requested in bug 623954
2010-07-10 17:12:31 -04:00

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/*
* Copyright © 2009, 2010 Codethink Limited
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the licence, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* Author: Ryan Lortie <desrt@desrt.ca>
*/
/* Prelude {{{1 */
#define _GNU_SOURCE
#include "config.h"
#include <glib.h>
#include <glibintl.h>
#include <locale.h>
#include "gsettings.h"
#include "gdelayedsettingsbackend.h"
#include "gsettingsbackendinternal.h"
#include "gsettings-mapping.h"
#include "gio-marshal.h"
#include "gsettingsschema.h"
#include <string.h>
#include "strinfo.c"
/**
* SECTION:gsettings
* @short_description: a high-level API for application settings
*
* The #GSettings class provides a convenient API for storing and retrieving
* application settings.
*
* When creating a GSettings instance, you have to specify a schema
* that describes the keys in your settings and their types and default
* values, as well as some other information.
*
* Normally, a schema has as fixed path that determines where the settings
* are stored in the conceptual global tree of settings. However, schemas
* can also be 'relocatable', i.e. not equipped with a fixed path. This is
* useful e.g. when the schema describes an 'account', and you want to be
* able to store a arbitrary number of accounts.
*
* Unlike other configuration systems (like GConf), GSettings does not
* restrict keys to basic types like strings and numbers. GSettings stores
* values as #GVariant, and allows any #GVariantType for keys. Key names
* are restricted to lowercase characters, numbers and '-'. Furthermore,
* the names must begin with a lowercase character, must not end
* with a '-', and must not contain consecutive dashes. Key names can
* be up to 32 characters long.
*
* Similar to GConf, the default values in GSettings schemas can be
* localized, but the localized values are stored in gettext catalogs
* and looked up with the domain that is specified in the
* <tag class="attribute">gettext-domain</tag> attribute of the
* <tag class="starttag">schemalist</tag> or <tag class="starttag">schema</tag>
* elements and the category that is specified in the l10n attribute of the
* <tag class="starttag">key</tag> element.
*
* GSettings uses schemas in a compact binary form that is created
* by the <link linkend="glib-compile-schemas">glib-compile-schemas</link>
* utility. The input is a schema description in an XML format that can be
* described by the following DTD:
* |[<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gio/gschema.dtd"><xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback></xi:include>]|
*
* At runtime, schemas are identified by their id (as specified
* in the <tag class="attribute">id</tag> attribute of the
* <tag class="starttag">schema</tag> element). The
* convention for schema ids is to use a dotted name, similar in
* style to a DBus bus name, e.g. "org.gnome.font-rendering".
*
* <example><title>Default values</title>
* <programlisting><![CDATA[
* <schemalist>
* <schema id="org.gtk.test" path="/tests/" gettext-domain="test">
*
* <key name="greeting" type="s">
* <default l10n="messages">"Hello, earthlings"</default>
* <summary>A greeting</summary>
* <description>
* Greeting of the invading martians
* </description>
* </key>
*
* <key name="box" type="(ii)">
* <default>(20,30)</default>
* </key>
*
* </schema>
* </schemalist>
* ]]></programlisting></example>
*
* <example><title>Ranges, choices and enumerated types</title>
* <programlisting><![CDATA[
* <schemalist>
*
* <enum id="myenum">
* <value nick="first" value="1"/>
* <value nick="second" value="2"/>
* </enum>
*
* <schema id="org.gtk.test">
*
* <key name="key-with-range" type="i">
* <range min="1" max="100"/>
* <default>10</default>
* </key>
*
* <key name="key-with-choices" type="s">
* <choices>
* <choice value='Elisabeth'/>
* <choice value='Annabeth'/>
* <choice value='Joe'/>
* </choices>
* <aliases>
* <alias value='Anna' target='Annabeth'/>
* <alias value='Beth' target='Elisabeth'/>
* </aliases>
* <default>'Joe'</default>
* </key>
*
* <key name='enumerated-key' enum='myenum'>
* <default>'first'</default>
* </key>
*
* </schema>
* </schemalist>
* ]]></programlisting></example>
*
* <refsect2>
* <title>Binding</title>
* <para>
* A very convenient feature of GSettings lets you bind #GObject properties
* directly to settings, using g_settings_bind(). Once a GObject property
* has been bound to a setting, changes on either side are automatically
* propagated to the other side. GSettings handles details like
* mapping between GObject and GVariant types, and preventing infinite
* cycles.
* </para>
* <para>
* This makes it very easy to hook up a preferences dialog to the
* underlying settings. To make this even more convenient, GSettings
* looks for a boolean property with the name "sensitivity" and
* automatically binds it to the writability of the bound setting.
* If this 'magic' gets in the way, it can be suppressed with the
* #G_SETTINGS_BIND_NO_SENSITIVITY flag.
* </para>
* </refsect2>
**/
struct _GSettingsPrivate
{
/* where the signals go... */
GMainContext *main_context;
GSettingsBackend *backend;
GSettingsSchema *schema;
gchar *schema_name;
gchar *path;
GDelayedSettingsBackend *delayed;
};
enum
{
PROP_0,
PROP_SCHEMA,
PROP_BACKEND,
PROP_PATH,
PROP_HAS_UNAPPLIED,
};
enum
{
SIGNAL_WRITABLE_CHANGE_EVENT,
SIGNAL_WRITABLE_CHANGED,
SIGNAL_CHANGE_EVENT,
SIGNAL_CHANGED,
N_SIGNALS
};
static guint g_settings_signals[N_SIGNALS];
G_DEFINE_TYPE (GSettings, g_settings, G_TYPE_OBJECT)
/* Signals {{{1 */
static gboolean
g_settings_real_change_event (GSettings *settings,
const GQuark *keys,
gint n_keys)
{
gint i;
if (keys == NULL)
keys = g_settings_schema_list (settings->priv->schema, &n_keys);
for (i = 0; i < n_keys; i++)
g_signal_emit (settings, g_settings_signals[SIGNAL_CHANGED],
keys[i], g_quark_to_string (keys[i]));
return FALSE;
}
static gboolean
g_settings_real_writable_change_event (GSettings *settings,
GQuark key)
{
const GQuark *keys = &key;
gint n_keys = 1;
gint i;
if (key == 0)
keys = g_settings_schema_list (settings->priv->schema, &n_keys);
for (i = 0; i < n_keys; i++)
{
const gchar *string = g_quark_to_string (keys[i]);
g_signal_emit (settings, g_settings_signals[SIGNAL_WRITABLE_CHANGED],
keys[i], string);
g_signal_emit (settings, g_settings_signals[SIGNAL_CHANGED],
keys[i], string);
}
return FALSE;
}
static void
settings_backend_changed (GSettingsBackend *backend,
GObject *target,
const gchar *key,
gpointer origin_tag)
{
GSettings *settings = G_SETTINGS (target);
gboolean ignore_this;
gint i;
g_assert (settings->priv->backend == backend);
for (i = 0; key[i] == settings->priv->path[i]; i++);
if (settings->priv->path[i] == '\0' &&
g_settings_schema_has_key (settings->priv->schema, key + i))
{
GQuark quark;
quark = g_quark_from_string (key + i);
g_signal_emit (settings, g_settings_signals[SIGNAL_CHANGE_EVENT],
0, &quark, 1, &ignore_this);
}
}
static void
settings_backend_path_changed (GSettingsBackend *backend,
GObject *target,
const gchar *path,
gpointer origin_tag)
{
GSettings *settings = G_SETTINGS (target);
gboolean ignore_this;
g_assert (settings->priv->backend == backend);
if (g_str_has_prefix (settings->priv->path, path))
g_signal_emit (settings, g_settings_signals[SIGNAL_CHANGE_EVENT],
0, NULL, 0, &ignore_this);
}
static void
settings_backend_keys_changed (GSettingsBackend *backend,
GObject *target,
const gchar *path,
const gchar * const *items,
gpointer origin_tag)
{
GSettings *settings = G_SETTINGS (target);
gboolean ignore_this;
gint i;
g_assert (settings->priv->backend == backend);
for (i = 0; settings->priv->path[i] &&
settings->priv->path[i] == path[i]; i++);
if (path[i] == '\0')
{
GQuark quarks[256];
gint j, l = 0;
for (j = 0; items[j]; j++)
{
const gchar *item = items[j];
gint k;
for (k = 0; item[k] == settings->priv->path[i + k]; k++);
if (settings->priv->path[i + k] == '\0' &&
g_settings_schema_has_key (settings->priv->schema, item + k))
quarks[l++] = g_quark_from_string (item + k);
/* "256 quarks ought to be enough for anybody!"
* If this bites you, I'm sorry. Please file a bug.
*/
g_assert (l < 256);
}
if (l > 0)
g_signal_emit (settings, g_settings_signals[SIGNAL_CHANGE_EVENT],
0, quarks, l, &ignore_this);
}
}
static void
settings_backend_writable_changed (GSettingsBackend *backend,
GObject *target,
const gchar *key)
{
GSettings *settings = G_SETTINGS (target);
gboolean ignore_this;
gint i;
g_assert (settings->priv->backend == backend);
for (i = 0; key[i] == settings->priv->path[i]; i++);
if (settings->priv->path[i] == '\0' &&
g_settings_schema_has_key (settings->priv->schema, key + i))
g_signal_emit (settings, g_settings_signals[SIGNAL_WRITABLE_CHANGE_EVENT],
0, g_quark_from_string (key + i), &ignore_this);
}
static void
settings_backend_path_writable_changed (GSettingsBackend *backend,
GObject *target,
const gchar *path)
{
GSettings *settings = G_SETTINGS (target);
gboolean ignore_this;
g_assert (settings->priv->backend == backend);
if (g_str_has_prefix (settings->priv->path, path))
g_signal_emit (settings, g_settings_signals[SIGNAL_WRITABLE_CHANGE_EVENT],
0, (GQuark) 0, &ignore_this);
}
/* Properties, Construction, Destruction {{{1 */
static void
g_settings_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GSettings *settings = G_SETTINGS (object);
switch (prop_id)
{
case PROP_SCHEMA:
g_assert (settings->priv->schema_name == NULL);
settings->priv->schema_name = g_value_dup_string (value);
break;
case PROP_PATH:
settings->priv->path = g_value_dup_string (value);
break;
case PROP_BACKEND:
settings->priv->backend = g_value_dup_object (value);
break;
default:
g_assert_not_reached ();
}
}
static void
g_settings_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GSettings *settings = G_SETTINGS (object);
switch (prop_id)
{
case PROP_SCHEMA:
g_value_set_string (value, settings->priv->schema_name);
break;
case PROP_HAS_UNAPPLIED:
g_value_set_boolean (value, g_settings_get_has_unapplied (settings));
break;
default:
g_assert_not_reached ();
}
}
static void
g_settings_constructed (GObject *object)
{
GSettings *settings = G_SETTINGS (object);
const gchar *schema_path;
settings->priv->schema = g_settings_schema_new (settings->priv->schema_name);
schema_path = g_settings_schema_get_path (settings->priv->schema);
if (settings->priv->path && schema_path && strcmp (settings->priv->path, schema_path) != 0)
g_error ("settings object created with schema '%s' and path '%s', but "
"path '%s' is specified by schema",
settings->priv->schema_name, settings->priv->path, schema_path);
if (settings->priv->path == NULL)
{
if (schema_path == NULL)
g_error ("attempting to create schema '%s' without a path",
settings->priv->schema_name);
settings->priv->path = g_strdup (schema_path);
}
if (settings->priv->backend == NULL)
settings->priv->backend = g_settings_backend_get_default ();
g_settings_backend_watch (settings->priv->backend, G_OBJECT (settings),
settings->priv->main_context,
settings_backend_changed,
settings_backend_path_changed,
settings_backend_keys_changed,
settings_backend_writable_changed,
settings_backend_path_writable_changed);
g_settings_backend_subscribe (settings->priv->backend,
settings->priv->path);
}
static void
g_settings_finalize (GObject *object)
{
GSettings *settings = G_SETTINGS (object);
g_settings_backend_unsubscribe (settings->priv->backend,
settings->priv->path);
g_main_context_unref (settings->priv->main_context);
g_object_unref (settings->priv->backend);
g_object_unref (settings->priv->schema);
g_free (settings->priv->schema_name);
g_free (settings->priv->path);
G_OBJECT_CLASS (g_settings_parent_class)->finalize (object);
}
static void
g_settings_init (GSettings *settings)
{
settings->priv = G_TYPE_INSTANCE_GET_PRIVATE (settings,
G_TYPE_SETTINGS,
GSettingsPrivate);
settings->priv->main_context = g_main_context_get_thread_default ();
if (settings->priv->main_context == NULL)
settings->priv->main_context = g_main_context_default ();
g_main_context_ref (settings->priv->main_context);
}
static void
g_settings_class_init (GSettingsClass *class)
{
GObjectClass *object_class = G_OBJECT_CLASS (class);
class->writable_change_event = g_settings_real_writable_change_event;
class->change_event = g_settings_real_change_event;
object_class->set_property = g_settings_set_property;
object_class->get_property = g_settings_get_property;
object_class->constructed = g_settings_constructed;
object_class->finalize = g_settings_finalize;
g_type_class_add_private (object_class, sizeof (GSettingsPrivate));
/**
* GSettings::changed:
* @settings: the object on which the signal was emitted
* @key: the name of the key that changed
*
* The "changed" signal is emitted when a key has potentially changed.
* You should call one of the g_settings_get() calls to check the new
* value.
*
* This signal supports detailed connections. You can connect to the
* detailed signal "changed::x" in order to only receive callbacks
* when key "x" changes.
*/
g_settings_signals[SIGNAL_CHANGED] =
g_signal_new ("changed", G_TYPE_SETTINGS,
G_SIGNAL_RUN_LAST | G_SIGNAL_DETAILED,
G_STRUCT_OFFSET (GSettingsClass, changed),
NULL, NULL, g_cclosure_marshal_VOID__STRING, G_TYPE_NONE,
1, G_TYPE_STRING | G_SIGNAL_TYPE_STATIC_SCOPE);
/**
* GSettings::change-event:
* @settings: the object on which the signal was emitted
* @keys: an array of #GQuark<!-- -->s for the changed keys, or %NULL
* @n_keys: the length of the @keys array, or 0
* @returns: %TRUE to stop other handlers from being invoked for the
* event. FALSE to propagate the event further.
*
* The "change-event" signal is emitted once per change event that
* affects this settings object. You should connect to this signal
* only if you are interested in viewing groups of changes before they
* are split out into multiple emissions of the "changed" signal.
* For most use cases it is more appropriate to use the "changed" signal.
*
* In the event that the change event applies to one or more specified
* keys, @keys will be an array of #GQuark of length @n_keys. In the
* event that the change event applies to the #GSettings object as a
* whole (ie: potentially every key has been changed) then @keys will
* be %NULL and @n_keys will be 0.
*
* The default handler for this signal invokes the "changed" signal
* for each affected key. If any other connected handler returns
* %TRUE then this default functionality will be supressed.
*/
g_settings_signals[SIGNAL_CHANGE_EVENT] =
g_signal_new ("change-event", G_TYPE_SETTINGS,
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GSettingsClass, change_event),
g_signal_accumulator_true_handled, NULL,
_gio_marshal_BOOL__POINTER_INT,
G_TYPE_BOOLEAN, 2, G_TYPE_POINTER, G_TYPE_INT);
/**
* GSettings::writable-changed:
* @settings: the object on which the signal was emitted
* @key: the key
*
* The "writable-changed" signal is emitted when the writability of a
* key has potentially changed. You should call
* g_settings_is_writable() in order to determine the new status.
*
* This signal supports detailed connections. You can connect to the
* detailed signal "writable-changed::x" in order to only receive
* callbacks when the writability of "x" changes.
*/
g_settings_signals[SIGNAL_WRITABLE_CHANGED] =
g_signal_new ("writable-changed", G_TYPE_SETTINGS,
G_SIGNAL_RUN_LAST | G_SIGNAL_DETAILED,
G_STRUCT_OFFSET (GSettingsClass, changed),
NULL, NULL, g_cclosure_marshal_VOID__STRING, G_TYPE_NONE,
1, G_TYPE_STRING | G_SIGNAL_TYPE_STATIC_SCOPE);
/**
* GSettings::writable-change-event:
* @settings: the object on which the signal was emitted
* @key: the quark of the key, or 0
* @returns: %TRUE to stop other handlers from being invoked for the
* event. FALSE to propagate the event further.
*
* The "writable-change-event" signal is emitted once per writability
* change event that affects this settings object. You should connect
* to this signal if you are interested in viewing groups of changes
* before they are split out into multiple emissions of the
* "writable-changed" signal. For most use cases it is more
* appropriate to use the "writable-changed" signal.
*
* In the event that the writability change applies only to a single
* key, @key will be set to the #GQuark for that key. In the event
* that the writability change affects the entire settings object,
* @key will be 0.
*
* The default handler for this signal invokes the "writable-changed"
* and "changed" signals for each affected key. This is done because
* changes in writability might also imply changes in value (if for
* example, a new mandatory setting is introduced). If any other
* connected handler returns %TRUE then this default functionality
* will be supressed.
*/
g_settings_signals[SIGNAL_WRITABLE_CHANGE_EVENT] =
g_signal_new ("writable-change-event", G_TYPE_SETTINGS,
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GSettingsClass, writable_change_event),
g_signal_accumulator_true_handled, NULL,
_gio_marshal_BOOLEAN__UINT, G_TYPE_BOOLEAN, 1, G_TYPE_UINT);
/**
* GSettings:context:
*
* The name of the context that the settings are stored in.
*/
g_object_class_install_property (object_class, PROP_BACKEND,
g_param_spec_object ("backend",
P_("GSettingsBackend"),
P_("The GSettingsBackend for this settings object"),
G_TYPE_SETTINGS_BACKEND, G_PARAM_CONSTRUCT_ONLY |
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GSettings:schema:
*
* The name of the schema that describes the types of keys
* for this #GSettings object.
*/
g_object_class_install_property (object_class, PROP_SCHEMA,
g_param_spec_string ("schema",
P_("Schema name"),
P_("The name of the schema for this settings object"),
NULL,
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GSettings:path:
*
* The path within the backend where the settings are stored.
*/
g_object_class_install_property (object_class, PROP_PATH,
g_param_spec_string ("path",
P_("Base path"),
P_("The path within the backend where the settings are"),
NULL,
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GSettings:has-unapplied:
*
* If this property is %TRUE, the #GSettings object has outstanding
* changes that will be applied when g_settings_apply() is called.
*/
g_object_class_install_property (object_class, PROP_HAS_UNAPPLIED,
g_param_spec_boolean ("has-unapplied",
P_("Has unapplied changes"),
P_("TRUE if there are outstanding changes to apply()"),
FALSE,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
}
/* Construction (new, new_with_path, etc.) {{{1 */
/**
* g_settings_new:
* @schema: the name of the schema
* @returns: a new #GSettings object
*
* Creates a new #GSettings object with a given schema.
*
* Signals on the newly created #GSettings object will be dispatched
* via the thread-default #GMainContext in effect at the time of the
* call to g_settings_new(). The new #GSettings will hold a reference
* on the context. See g_main_context_push_thread_default().
*
* Since: 2.26
*/
GSettings *
g_settings_new (const gchar *schema)
{
g_return_val_if_fail (schema != NULL, NULL);
return g_object_new (G_TYPE_SETTINGS,
"schema", schema,
NULL);
}
/**
* g_settings_new_with_path:
* @schema: the name of the schema
* @path: the path to use
* @returns: a new #GSettings object
*
* Creates a new #GSettings object with a given schema and path.
*
* You only need to do this if you want to directly create a settings
* object with a schema that doesn't have a specified path of its own.
* That's quite rare.
*
* It is a programmer error to call this function for a schema that
* has an explicitly specified path.
*
* Since: 2.26
*/
GSettings *
g_settings_new_with_path (const gchar *schema,
const gchar *path)
{
g_return_val_if_fail (schema != NULL, NULL);
g_return_val_if_fail (path != NULL, NULL);
return g_object_new (G_TYPE_SETTINGS,
"schema", schema,
"path", path,
NULL);
}
/**
* g_settings_new_with_backend:
* @schema: the name of the schema
* @backend: the #GSettingsBackend to use
* @returns: a new #GSettings object
*
* Creates a new #GSettings object with a given schema and backend.
*
* Creating settings objects with an different backend allows accessing settings
* from a database other than the usual one. For example, it may make
* sense to pass a backend corresponding to the "defaults" settings database on
* the system to get a settings object that modifies the system default
* settings instead of the settings for this user.
*
* Since: 2.26
*/
GSettings *
g_settings_new_with_backend (const gchar *schema,
GSettingsBackend *backend)
{
g_return_val_if_fail (schema != NULL, NULL);
g_return_val_if_fail (G_IS_SETTINGS_BACKEND (backend), NULL);
return g_object_new (G_TYPE_SETTINGS,
"schema", schema,
"backend", backend,
NULL);
}
/**
* g_settings_new_with_backend_and_path:
* @schema: the name of the schema
* @backend: the #GSettingsBackend to use
* @path: the path to use
* @returns: a new #GSettings object
*
* Creates a new #GSettings object with a given schema, backend and
* path.
*
* This is a mix of g_settings_new_with_backend() and
* g_settings_new_with_path().
*
* Since: 2.26
*/
GSettings *
g_settings_new_with_backend_and_path (const gchar *schema,
GSettingsBackend *backend,
const gchar *path)
{
g_return_val_if_fail (schema != NULL, NULL);
g_return_val_if_fail (G_IS_SETTINGS_BACKEND (backend), NULL);
g_return_val_if_fail (path != NULL, NULL);
return g_object_new (G_TYPE_SETTINGS,
"schema", schema,
"backend", backend,
"path", path,
NULL);
}
/* Internal read/write utilities, enum/flags conversion, validation {{{1 */
typedef struct
{
GSettings *settings;
const gchar *key;
GSettingsSchema *schema;
guint is_flags : 1;
guint is_enum : 1;
const guint32 *strinfo;
gsize strinfo_length;
const gchar *unparsed;
gchar lc_char;
const GVariantType *type;
GVariant *minimum, *maximum;
GVariant *default_value;
} GSettingsKeyInfo;
static void
g_settings_get_key_info (GSettingsKeyInfo *info,
GSettings *settings,
const gchar *key)
{
GVariantIter *iter;
GVariant *data;
guchar code;
memset (info, 0, sizeof *info);
iter = g_settings_schema_get_value (settings->priv->schema, key);
info->default_value = g_variant_iter_next_value (iter);
info->type = g_variant_get_type (info->default_value);
info->settings = g_object_ref (settings);
info->key = g_intern_string (key);
while (g_variant_iter_next (iter, "(y*)", &code, &data))
{
switch (code)
{
case 'l':
/* translation requested */
g_variant_get (data, "(y&s)", &info->lc_char, &info->unparsed);
break;
case 'e':
/* enumerated types... */
info->is_enum = TRUE;
goto choice;
case 'f':
/* flags... */
info->is_flags = TRUE;
goto choice;
choice: case 'c':
/* ..., choices, aliases */
info->strinfo = g_variant_get_fixed_array (data,
&info->strinfo_length,
sizeof (guint32));
break;
case 'r':
g_variant_get (data, "(**)", &info->minimum, &info->maximum);
break;
default:
g_warning ("unknown schema extension '%c'", code);
break;
}
g_variant_unref (data);
}
g_variant_iter_free (iter);
}
static void
g_settings_free_key_info (GSettingsKeyInfo *info)
{
if (info->minimum)
g_variant_unref (info->minimum);
if (info->maximum)
g_variant_unref (info->maximum);
g_variant_unref (info->default_value);
g_object_unref (info->settings);
}
static gboolean
g_settings_write_to_backend (GSettingsKeyInfo *info,
GVariant *value)
{
gboolean success;
gchar *path;
path = g_strconcat (info->settings->priv->path, info->key, NULL);
success = g_settings_backend_write (info->settings->priv->backend,
path, value, NULL);
g_free (path);
return success;
}
static gboolean
g_settings_type_check (GSettingsKeyInfo *info,
GVariant *value)
{
g_return_val_if_fail (value != NULL, FALSE);
return g_variant_is_of_type (value, info->type);
}
static gboolean
g_settings_range_check (GSettingsKeyInfo *info,
GVariant *value)
{
if (info->minimum == NULL && info->strinfo == NULL)
return TRUE;
if (g_variant_is_container (value))
{
gboolean ok = TRUE;
GVariantIter iter;
GVariant *child;
g_variant_iter_init (&iter, value);
while (ok && (child = g_variant_iter_next_value (&iter)))
{
ok = g_settings_range_check (info, child);
g_variant_unref (child);
}
return ok;
}
if (info->minimum)
{
return g_variant_compare (info->minimum, value) <= 0 &&
g_variant_compare (value, info->maximum) <= 0;
}
return strinfo_is_string_valid (info->strinfo,
info->strinfo_length,
g_variant_get_string (value, NULL));
}
static GVariant *
g_settings_range_fixup (GSettingsKeyInfo *info,
GVariant *value)
{
const gchar *target;
if (g_settings_range_check (info, value))
return g_variant_ref (value);
if (info->strinfo == NULL)
return NULL;
if (g_variant_is_container (value))
{
GVariantBuilder builder;
GVariantIter iter;
GVariant *child;
g_variant_iter_init (&iter, value);
g_variant_builder_init (&builder, g_variant_get_type (value));
while ((child = g_variant_iter_next_value (&iter)))
{
GVariant *fixed;
fixed = g_settings_range_fixup (info, child);
g_variant_unref (child);
if (fixed == NULL)
{
g_variant_builder_clear (&builder);
return NULL;
}
g_variant_builder_add_value (&builder, fixed);
g_variant_unref (fixed);
}
return g_variant_ref_sink (g_variant_builder_end (&builder));
}
target = strinfo_string_from_alias (info->strinfo, info->strinfo_length,
g_variant_get_string (value, NULL));
return target ? g_variant_ref_sink (g_variant_new_string (target)) : NULL;
}
static GVariant *
g_settings_read_from_backend (GSettingsKeyInfo *info)
{
GVariant *value;
GVariant *fixup;
gchar *path;
path = g_strconcat (info->settings->priv->path, info->key, NULL);
value = g_settings_backend_read (info->settings->priv->backend,
path, info->type, FALSE);
g_free (path);
if (value != NULL)
{
fixup = g_settings_range_fixup (info, value);
g_variant_unref (value);
}
else
fixup = NULL;
return fixup;
}
static GVariant *
g_settings_get_translated_default (GSettingsKeyInfo *info)
{
const gchar *translated;
GError *error = NULL;
const gchar *domain;
GVariant *value;
if (info->lc_char == '\0')
/* translation not requested for this key */
return NULL;
domain = g_settings_schema_get_gettext_domain (info->settings->priv->schema);
if (info->lc_char == 't')
translated = g_dcgettext (domain, info->unparsed, LC_TIME);
else
translated = g_dgettext (domain, info->unparsed);
if (translated == info->unparsed)
/* the default value was not translated */
return NULL;
/* try to parse the translation of the unparsed default */
value = g_variant_parse (info->type, translated, NULL, NULL, &error);
if (value == NULL)
{
g_warning ("Failed to parse translated string `%s' for "
"key `%s' in schema `%s': %s", info->unparsed, info->key,
info->settings->priv->schema_name, error->message);
g_warning ("Using untranslated default instead.");
g_error_free (error);
}
else if (!g_settings_range_check (info, value))
{
g_warning ("Translated default `%s' for key `%s' in schema `%s' "
"is outside of valid range", info->unparsed, info->key,
info->settings->priv->schema_name);
g_variant_unref (value);
value = NULL;
}
return value;
}
static gint
g_settings_to_enum (GSettingsKeyInfo *info,
GVariant *value)
{
gboolean it_worked;
guint result;
it_worked = strinfo_enum_from_string (info->strinfo, info->strinfo_length,
g_variant_get_string (value, NULL),
&result);
/* 'value' can only come from the backend after being filtered for validity,
* from the translation after being filtered for validity, or from the schema
* itself (which the schema compiler checks for validity). If this assertion
* fails then it's really a bug in GSettings or the schema compiler...
*/
g_assert (it_worked);
return result;
}
static GVariant *
g_settings_from_enum (GSettingsKeyInfo *info,
gint value)
{
const gchar *string;
string = strinfo_string_from_enum (info->strinfo,
info->strinfo_length,
value);
if (string == NULL)
return NULL;
return g_variant_new_string (string);
}
static guint
g_settings_to_flags (GSettingsKeyInfo *info,
GVariant *value)
{
GVariantIter iter;
const gchar *flag;
guint result;
result = 0;
g_variant_iter_init (&iter, value);
while (g_variant_iter_next (&iter, "&s", &flag))
{
gboolean it_worked;
guint flag_value;
it_worked = strinfo_enum_from_string (info->strinfo,
info->strinfo_length,
flag, &flag_value);
/* as in g_settings_to_enum() */
g_assert (it_worked);
result |= flag_value;
}
return result;
}
static GVariant *
g_settings_from_flags (GSettingsKeyInfo *info,
guint value)
{
GVariantBuilder builder;
gint i;
g_variant_builder_init (&builder, G_VARIANT_TYPE ("as"));
for (i = 0; i < 32; i++)
if (value & (1u << i))
{
const gchar *string;
string = strinfo_string_from_enum (info->strinfo,
info->strinfo_length,
1u << i);
if (string == NULL)
{
g_variant_builder_clear (&builder);
return NULL;
}
g_variant_builder_add (&builder, "s", string);
}
return g_variant_builder_end (&builder);
}
/* Public Get/Set API {{{1 (get, get_value, set, set_value, get_mapped) */
/**
* g_settings_get_value:
* @settings: a #GSettings object
* @key: the key to get the value for
* @returns: a new #GVariant
*
* Gets the value that is stored in @settings for @key.
*
* It is a programmer error to give a @key that isn't contained in the
* schema for @settings.
*
* Since: 2.26
*/
GVariant *
g_settings_get_value (GSettings *settings,
const gchar *key)
{
GSettingsKeyInfo info;
GVariant *value;
g_return_val_if_fail (G_IS_SETTINGS (settings), NULL);
g_return_val_if_fail (key != NULL, NULL);
g_settings_get_key_info (&info, settings, key);
value = g_settings_read_from_backend (&info);
if (value == NULL)
value = g_settings_get_translated_default (&info);
if (value == NULL)
value = g_variant_ref (info.default_value);
g_settings_free_key_info (&info);
return value;
}
/**
* g_settings_get_enum:
* @settings: a #GSettings object
* @key: the key to get the value for
* @returns: the enum value
*
* Gets the value that is stored in @settings for @key and converts it
* to the enum value that it represents.
*
* In order to use this function the type of the value must be a string
* and it must be marked in the schema file as an enumerated type.
*
* It is a programmer error to give a @key that isn't contained in the
* schema for @settings or is not marked as an enumerated type.
*
* If the value stored in the configuration database is not a valid
* value for the enumerated type then this function will return the
* default value.
*
* Since: 2.26
**/
gint
g_settings_get_enum (GSettings *settings,
const gchar *key)
{
GSettingsKeyInfo info;
GVariant *value;
gint result;
g_return_val_if_fail (G_IS_SETTINGS (settings), -1);
g_return_val_if_fail (key != NULL, -1);
g_settings_get_key_info (&info, settings, key);
if (!info.is_enum)
{
g_critical ("g_settings_get_enum() called on key `%s' which is not "
"associated with an enumerated type", info.key);
g_settings_free_key_info (&info);
return -1;
}
value = g_settings_read_from_backend (&info);
if (value == NULL)
value = g_settings_get_translated_default (&info);
if (value == NULL)
value = g_variant_ref (info.default_value);
result = g_settings_to_enum (&info, value);
g_settings_free_key_info (&info);
g_variant_unref (value);
return result;
}
/**
* g_settings_set_enum:
* @settings: a #GSettings object
* @key: a key, within @settings
* @value: an enumerated value
* @returns: %TRUE, if the set succeeds
*
* Looks up the enumerated type nick for @value and writes it to @key,
* within @settings.
*
* It is a programmer error to give a @key that isn't contained in the
* schema for @settings or is not marked as an enumerated type, or for
* @value not to be a valid value for the named type.
*
* After performing the write, accessing @key directly with
* g_settings_get_string() will return the 'nick' associated with
* @value.
**/
gboolean
g_settings_set_enum (GSettings *settings,
const gchar *key,
gint value)
{
GSettingsKeyInfo info;
GVariant *variant;
gboolean success;
g_return_val_if_fail (G_IS_SETTINGS (settings), FALSE);
g_return_val_if_fail (key != NULL, FALSE);
g_settings_get_key_info (&info, settings, key);
if (!info.is_enum)
{
g_critical ("g_settings_set_enum() called on key `%s' which is not "
"associated with an enumerated type", info.key);
return FALSE;
}
if (!(variant = g_settings_from_enum (&info, value)))
{
g_critical ("g_settings_set_enum(): invalid enum value %d for key `%s' "
"in schema `%s'. Doing nothing.", value, info.key,
info.settings->priv->schema_name);
g_settings_free_key_info (&info);
return FALSE;
}
success = g_settings_write_to_backend (&info, variant);
g_settings_free_key_info (&info);
return success;
}
/**
* g_settings_get_flags:
* @settings: a #GSettings object
* @key: the key to get the value for
* @returns: the flags value
*
* Gets the value that is stored in @settings for @key and converts it
* to the flags value that it represents.
*
* In order to use this function the type of the value must be an array
* of strings and it must be marked in the schema file as an flags type.
*
* It is a programmer error to give a @key that isn't contained in the
* schema for @settings or is not marked as a flags type.
*
* If the value stored in the configuration database is not a valid
* value for the flags type then this function will return the default
* value.
*
* Since: 2.26
**/
guint
g_settings_get_flags (GSettings *settings,
const gchar *key)
{
GSettingsKeyInfo info;
GVariant *value;
guint result;
g_return_val_if_fail (G_IS_SETTINGS (settings), -1);
g_return_val_if_fail (key != NULL, -1);
g_settings_get_key_info (&info, settings, key);
if (!info.is_flags)
{
g_critical ("g_settings_get_flags() called on key `%s' which is not "
"associated with a flags type", info.key);
g_settings_free_key_info (&info);
return -1;
}
value = g_settings_read_from_backend (&info);
if (value == NULL)
value = g_settings_get_translated_default (&info);
if (value == NULL)
value = g_variant_ref (info.default_value);
result = g_settings_to_flags (&info, value);
g_settings_free_key_info (&info);
g_variant_unref (value);
return result;
}
/**
* g_settings_set_flags:
* @settings: a #GSettings object
* @key: a key, within @settings
* @value: a flags value
* @returns: %TRUE, if the set succeeds
*
* Looks up the flags type nicks for the bits specified by @value, puts
* them in an array of strings and writes the array to @key, withing
* @settings.
*
* It is a programmer error to give a @key that isn't contained in the
* schema for @settings or is not marked as a flags type, or for @value
* to contain any bits that are not value for the named type.
*
* After performing the write, accessing @key directly with
* g_settings_get_strv() will return an array of 'nicks'; one for each
* bit in @value.
**/
gboolean
g_settings_set_flags (GSettings *settings,
const gchar *key,
guint value)
{
GSettingsKeyInfo info;
GVariant *variant;
gboolean success;
g_return_val_if_fail (G_IS_SETTINGS (settings), FALSE);
g_return_val_if_fail (key != NULL, FALSE);
g_settings_get_key_info (&info, settings, key);
if (!info.is_flags)
{
g_critical ("g_settings_set_flags() called on key `%s' which is not "
"associated with a flags type", info.key);
return FALSE;
}
if (!(variant = g_settings_from_flags (&info, value)))
{
g_critical ("g_settings_set_flags(): invalid flags value 0x%08x "
"for key `%s' in schema `%s'. Doing nothing.",
value, info.key, info.settings->priv->schema_name);
g_settings_free_key_info (&info);
return FALSE;
}
success = g_settings_write_to_backend (&info, variant);
g_settings_free_key_info (&info);
return success;
}
/**
* g_settings_set_value:
* @settings: a #GSettings object
* @key: the name of the key to set
* @value: a #GVariant of the correct type
* @returns: %TRUE if setting the key succeeded,
* %FALSE if the key was not writable
*
* Sets @key in @settings to @value.
*
* It is a programmer error to give a @key that isn't contained in the
* schema for @settings or for @value to have the incorrect type, per
* the schema.
*
* If @value is floating then this function consumes the reference.
*
* Since: 2.26
**/
gboolean
g_settings_set_value (GSettings *settings,
const gchar *key,
GVariant *value)
{
GSettingsKeyInfo info;
g_return_val_if_fail (G_IS_SETTINGS (settings), FALSE);
g_return_val_if_fail (key != NULL, FALSE);
g_settings_get_key_info (&info, settings, key);
g_return_val_if_fail (g_settings_type_check (&info, value), FALSE);
g_return_val_if_fail (g_settings_range_check (&info, value), FALSE);
g_settings_free_key_info (&info);
return g_settings_write_to_backend (&info, value);
}
/**
* g_settings_get:
* @settings: a #GSettings object
* @key: the key to get the value for
* @format: a #GVariant format string
* @...: arguments as per @format
*
* Gets the value that is stored at @key in @settings.
*
* A convenience function that combines g_settings_get_value() with
* g_variant_get().
*
* It is a programmer error to give a @key that isn't contained in the
* schema for @settings or for the #GVariantType of @format to mismatch
* the type given in the schema.
*
* Since: 2.26
*/
void
g_settings_get (GSettings *settings,
const gchar *key,
const gchar *format,
...)
{
GVariant *value;
va_list ap;
value = g_settings_get_value (settings, key);
va_start (ap, format);
g_variant_get_va (value, format, NULL, &ap);
va_end (ap);
g_variant_unref (value);
}
/**
* g_settings_set:
* @settings: a #GSettings object
* @key: the name of the key to set
* @format: a #GVariant format string
* @...: arguments as per @format
* @returns: %TRUE if setting the key succeeded,
* %FALSE if the key was not writable
*
* Sets @key in @settings to @value.
*
* A convenience function that combines g_settings_set_value() with
* g_variant_new().
*
* It is a programmer error to give a @key that isn't contained in the
* schema for @settings or for the #GVariantType of @format to mismatch
* the type given in the schema.
*
* Since: 2.26
*/
gboolean
g_settings_set (GSettings *settings,
const gchar *key,
const gchar *format,
...)
{
GVariant *value;
va_list ap;
va_start (ap, format);
value = g_variant_new_va (format, NULL, &ap);
va_end (ap);
return g_settings_set_value (settings, key, value);
}
/**
* g_settings_get_mapped:
* @settings: a #GSettings object
* @key: the key to get the value for
* @mapping: the function to map the value in the settings database to
* the value used by the application
* @user_data: user data for @mapping
*
* Gets the value that is stored at @key in @settings, subject to
* application-level validation/mapping.
*
* You should use this function when the application needs to perform
* some processing on the value of the key (for example, parsing). The
* @mapping function performs that processing. If the function
* indicates that the processing was unsuccessful (due to a parse error,
* for example) then the mapping is tried again with another value.
* This allows a robust 'fall back to defaults' behaviour to be
* implemented somewhat automatically.
*
* The first value that is tried is the user's setting for the key. If
* the mapping function fails to map this value, other values may be
* tried in an unspecified order (system or site defaults, translated
* schema default values, untranslated schema default values, etc).
*
* If the mapping function fails for all possible values, one additional
* attempt is made: the mapping function is called with a %NULL value.
* If the mapping function still indicates failure at this point then
* the application will be aborted.
*
* The result parameter for the @mapping function is pointed to a
* #gpointer which is initially set to %NULL. The same pointer is given
* to each invocation of @mapping. The final value of that #gpointer is
* what is returned by this function. %NULL is valid; it is returned
* just as any other value would be.
**/
gpointer
g_settings_get_mapped (GSettings *settings,
const gchar *key,
GSettingsGetMapping mapping,
gpointer user_data)
{
gpointer result = NULL;
GSettingsKeyInfo info;
GVariant *value;
gboolean okay;
g_return_val_if_fail (G_IS_SETTINGS (settings), NULL);
g_return_val_if_fail (key != NULL, NULL);
g_return_val_if_fail (mapping != NULL, NULL);
g_settings_get_key_info (&info, settings, key);
if ((value = g_settings_read_from_backend (&info)))
{
okay = mapping (value, &result, user_data);
g_variant_unref (value);
if (okay) goto okay;
}
if ((value = g_settings_get_translated_default (&info)))
{
okay = mapping (value, &result, user_data);
g_variant_unref (value);
if (okay) goto okay;
}
if (mapping (info.default_value, &result, user_data))
goto okay;
if (!mapping (NULL, &result, user_data))
g_error ("The mapping function given to g_settings_get_mapped() for key "
"`%s' in schema `%s' returned FALSE when given a NULL value.",
key, settings->priv->schema_name);
okay:
g_settings_free_key_info (&info);
return result;
}
/* Convenience API (get, set_string, int, double, boolean, strv) {{{1 */
/**
* g_settings_get_string:
* @settings: a #GSettings object
* @key: the key to get the value for
* @returns: a newly-allocated string
*
* Gets the value that is stored at @key in @settings.
*
* A convenience variant of g_settings_get() for strings.
*
* It is a programmer error to give a @key that isn't specified as
* having a string type in the schema for @settings.
*
* Since: 2.26
*/
gchar *
g_settings_get_string (GSettings *settings,
const gchar *key)
{
GVariant *value;
gchar *result;
value = g_settings_get_value (settings, key);
result = g_variant_dup_string (value, NULL);
g_variant_unref (value);
return result;
}
/**
* g_settings_set_string:
* @settings: a #GSettings object
* @key: the name of the key to set
* @value: the value to set it to
* @returns: %TRUE if setting the key succeeded,
* %FALSE if the key was not writable
*
* Sets @key in @settings to @value.
*
* A convenience variant of g_settings_set() for strings.
*
* It is a programmer error to give a @key that isn't specified as
* having a string type in the schema for @settings.
*
* Since: 2.26
*/
gboolean
g_settings_set_string (GSettings *settings,
const gchar *key,
const gchar *value)
{
return g_settings_set_value (settings, key, g_variant_new_string (value));
}
/**
* g_settings_get_int:
* @settings: a #GSettings object
* @key: the key to get the value for
* @returns: an integer
*
* Gets the value that is stored at @key in @settings.
*
* A convenience variant of g_settings_get() for 32-bit integers.
*
* It is a programmer error to give a @key that isn't specified as
* having a int32 type in the schema for @settings.
*
* Since: 2.26
*/
gint
g_settings_get_int (GSettings *settings,
const gchar *key)
{
GVariant *value;
gint result;
value = g_settings_get_value (settings, key);
result = g_variant_get_int32 (value);
g_variant_unref (value);
return result;
}
/**
* g_settings_set_int:
* @settings: a #GSettings object
* @key: the name of the key to set
* @value: the value to set it to
* @returns: %TRUE if setting the key succeeded,
* %FALSE if the key was not writable
*
* Sets @key in @settings to @value.
*
* A convenience variant of g_settings_set() for 32-bit integers.
*
* It is a programmer error to give a @key that isn't specified as
* having a int32 type in the schema for @settings.
*
* Since: 2.26
*/
gboolean
g_settings_set_int (GSettings *settings,
const gchar *key,
gint value)
{
return g_settings_set_value (settings, key, g_variant_new_int32 (value));
}
/**
* g_settings_get_double:
* @settings: a #GSettings object
* @key: the key to get the value for
* @returns: a double
*
* Gets the value that is stored at @key in @settings.
*
* A convenience variant of g_settings_get() for doubles.
*
* It is a programmer error to give a @key that isn't specified as
* having a 'double' type in the schema for @settings.
*
* Since: 2.26
*/
gdouble
g_settings_get_double (GSettings *settings,
const gchar *key)
{
GVariant *value;
gdouble result;
value = g_settings_get_value (settings, key);
result = g_variant_get_double (value);
g_variant_unref (value);
return result;
}
/**
* g_settings_set_double:
* @settings: a #GSettings object
* @key: the name of the key to set
* @value: the value to set it to
* @returns: %TRUE if setting the key succeeded,
* %FALSE if the key was not writable
*
* Sets @key in @settings to @value.
*
* A convenience variant of g_settings_set() for doubles.
*
* It is a programmer error to give a @key that isn't specified as
* having a 'double' type in the schema for @settings.
*
* Since: 2.26
*/
gboolean
g_settings_set_double (GSettings *settings,
const gchar *key,
gdouble value)
{
return g_settings_set_value (settings, key, g_variant_new_double (value));
}
/**
* g_settings_get_boolean:
* @settings: a #GSettings object
* @key: the key to get the value for
* @returns: a boolean
*
* Gets the value that is stored at @key in @settings.
*
* A convenience variant of g_settings_get() for booleans.
*
* It is a programmer error to give a @key that isn't specified as
* having a boolean type in the schema for @settings.
*
* Since: 2.26
*/
gboolean
g_settings_get_boolean (GSettings *settings,
const gchar *key)
{
GVariant *value;
gboolean result;
value = g_settings_get_value (settings, key);
result = g_variant_get_boolean (value);
g_variant_unref (value);
return result;
}
/**
* g_settings_set_boolean:
* @settings: a #GSettings object
* @key: the name of the key to set
* @value: the value to set it to
* @returns: %TRUE if setting the key succeeded,
* %FALSE if the key was not writable
*
* Sets @key in @settings to @value.
*
* A convenience variant of g_settings_set() for booleans.
*
* It is a programmer error to give a @key that isn't specified as
* having a boolean type in the schema for @settings.
*
* Since: 2.26
*/
gboolean
g_settings_set_boolean (GSettings *settings,
const gchar *key,
gboolean value)
{
return g_settings_set_value (settings, key, g_variant_new_boolean (value));
}
/**
* g_settings_get_strv:
* @settings: a #GSettings object
* @key: the key to get the value for
* @returns: a newly-allocated, %NULL-terminated array of strings
*
* Gets the value that is stored at @key in @settings.
*
* A convenience variant of g_settings_get() for string arrays.
*
* It is a programmer error to give a @key that isn't specified as
* having an array of strings type in the schema for @settings.
*
* Since: 2.26
*/
gchar **
g_settings_get_strv (GSettings *settings,
const gchar *key)
{
GVariant *value;
gchar **result;
value = g_settings_get_value (settings, key);
result = g_variant_dup_strv (value, NULL);
g_variant_unref (value);
return result;
}
/**
* g_settings_set_strv:
* @settings: a #GSettings object
* @key: the name of the key to set
* @value: (allow-none): the value to set it to, or %NULL
* @returns: %TRUE if setting the key succeeded,
* %FALSE if the key was not writable
*
* Sets @key in @settings to @value.
*
* A convenience variant of g_settings_set() for string arrays. If
* @value is %NULL, then @key is set to be the empty array.
*
* It is a programmer error to give a @key that isn't specified as
* having an array of strings type in the schema for @settings.
*
* Since: 2.26
*/
gboolean
g_settings_set_strv (GSettings *settings,
const gchar *key,
const gchar * const *value)
{
GVariant *array;
if (value != NULL)
array = g_variant_new_strv (value, -1);
else
array = g_variant_new_strv (NULL, 0);
return g_settings_set_value (settings, key, array);
}
/* Delayed apply (delay, apply, revert, get_has_unapplied) {{{1 */
/**
* g_settings_delay:
* @settings: a #GSettings object
*
* Changes the #GSettings object into 'delay-apply' mode. In this
* mode, changes to @settings are not immediately propagated to the
* backend, but kept locally until g_settings_apply() is called.
*
* Since: 2.26
*/
void
g_settings_delay (GSettings *settings)
{
g_return_if_fail (G_IS_SETTINGS (settings));
if (settings->priv->delayed)
return;
settings->priv->delayed =
g_delayed_settings_backend_new (settings->priv->backend,
settings,
settings->priv->main_context);
g_settings_backend_unwatch (settings->priv->backend, G_OBJECT (settings));
g_object_unref (settings->priv->backend);
settings->priv->backend = G_SETTINGS_BACKEND (settings->priv->delayed);
g_settings_backend_watch (settings->priv->backend, G_OBJECT (settings),
settings->priv->main_context,
settings_backend_changed,
settings_backend_path_changed,
settings_backend_keys_changed,
settings_backend_writable_changed,
settings_backend_path_writable_changed);
}
/**
* g_settings_apply:
* @settings: a #GSettings instance
*
* Applies any changes that have been made to the settings. This
* function does nothing unless @settings is in 'delay-apply' mode;
* see g_settings_delay(). In the normal case settings are always
* applied immediately.
**/
void
g_settings_apply (GSettings *settings)
{
if (settings->priv->delayed)
{
GDelayedSettingsBackend *delayed;
delayed = G_DELAYED_SETTINGS_BACKEND (settings->priv->backend);
g_delayed_settings_backend_apply (delayed);
}
}
/**
* g_settings_revert:
* @settings: a #GSettings instance
*
* Reverts all non-applied changes to the settings. This function
* does nothing unless @settings is in 'delay-apply' mode; see
* g_settings_delay(). In the normal case settings are always applied
* immediately.
*
* Change notifications will be emitted for affected keys.
**/
void
g_settings_revert (GSettings *settings)
{
if (settings->priv->delayed)
{
GDelayedSettingsBackend *delayed;
delayed = G_DELAYED_SETTINGS_BACKEND (settings->priv->backend);
g_delayed_settings_backend_revert (delayed);
}
}
/**
* g_settings_get_has_unapplied:
* @settings: a #GSettings object
* @returns: %TRUE if @settings has unapplied changes
*
* Returns whether the #GSettings object has any unapplied
* changes. This can only be the case if it is in 'delayed-apply' mode.
*
* Since: 2.26
*/
gboolean
g_settings_get_has_unapplied (GSettings *settings)
{
g_return_val_if_fail (G_IS_SETTINGS (settings), FALSE);
return settings->priv->delayed &&
g_delayed_settings_backend_get_has_unapplied (
G_DELAYED_SETTINGS_BACKEND (settings->priv->backend));
}
/* Extra API (sync, get_child, is_writable, list_items) {{{1 */
/**
* g_settings_sync:
* @context: the context to sync, or %NULL
*
* Ensures that all pending operations for the given context are
* complete.
*
* Writes made to a #GSettings are handled asynchronously. For this
* reason, it is very unlikely that the changes have it to disk by the
* time g_settings_set() returns.
*
* This call will block until all of the writes have made it to the
* backend. Since the mainloop is not running, no change notifications
* will be dispatched during this call (but some may be queued by the
* time the call is done).
**/
void
g_settings_sync (void)
{
g_settings_backend_sync_default ();
}
/**
* g_settings_is_writable:
* @settings: a #GSettings object
* @name: the name of a key
* @returns: %TRUE if the key @name is writable
*
* Finds out if a key can be written or not
*
* Since: 2.26
*/
gboolean
g_settings_is_writable (GSettings *settings,
const gchar *name)
{
gboolean writable;
gchar *path;
g_return_val_if_fail (G_IS_SETTINGS (settings), FALSE);
path = g_strconcat (settings->priv->path, name, NULL);
writable = g_settings_backend_get_writable (settings->priv->backend, path);
g_free (path);
return writable;
}
/**
* g_settings_get_child:
* @settings: a #GSettings object
* @name: the name of the 'child' schema
* @returns: a 'child' settings object
*
* Creates a 'child' settings object which has a base path of
* <replaceable>base-path</replaceable>/@name", where
* <replaceable>base-path</replaceable> is the base path of @settings.
*
* The schema for the child settings object must have been declared
* in the schema of @settings using a <tag class="starttag">child</tag> element.
*
* Since: 2.26
*/
GSettings *
g_settings_get_child (GSettings *settings,
const gchar *name)
{
const gchar *child_schema;
gchar *child_path;
gchar *child_name;
GSettings *child;
g_return_val_if_fail (G_IS_SETTINGS (settings), NULL);
child_name = g_strconcat (name, "/", NULL);
child_schema = g_settings_schema_get_string (settings->priv->schema,
child_name);
if (child_schema == NULL)
g_error ("Schema '%s' has no child '%s'",
settings->priv->schema_name, name);
child_path = g_strconcat (settings->priv->path, child_name, NULL);
child = g_object_new (G_TYPE_SETTINGS,
"schema", child_schema,
"path", child_path,
NULL);
g_free (child_path);
g_free (child_name);
return child;
}
/**
* g_settings_list_items:
* @settings: a #GSettings object
* Returns: a list of the keys on @settings
*
* Introspects the list of keys and children on @settings.
*
* The list that is returned is a mix of the keys and children. The
* names of the children are suffixed with '/'. The names of the keys
* are not.
*
* You should probably not be calling this function from "normal" code
* (since you should already know what keys are in your schema). This
* function is intended for introspection reasons.
*
* You should free the return value with g_free() when you are done with
* it.
*/
const gchar **
g_settings_list_items (GSettings *settings)
{
const GQuark *keys;
const gchar **strv;
gint n_keys;
gint i;
keys = g_settings_schema_list (settings->priv->schema, &n_keys);
strv = g_new (const gchar *, n_keys + 1);
for (i = 0; i < n_keys; i++)
strv[i] = g_quark_to_string (keys[i]);
strv[i] = NULL;
return strv;
}
/* Binding {{{1 */
typedef struct
{
GSettingsKeyInfo info;
GObject *object;
GSettingsBindGetMapping get_mapping;
GSettingsBindSetMapping set_mapping;
gpointer user_data;
GDestroyNotify destroy;
guint writable_handler_id;
guint property_handler_id;
const GParamSpec *property;
guint key_handler_id;
/* prevent recursion */
gboolean running;
} GSettingsBinding;
static void
g_settings_binding_free (gpointer data)
{
GSettingsBinding *binding = data;
g_assert (!binding->running);
if (binding->writable_handler_id)
g_signal_handler_disconnect (binding->info.settings,
binding->writable_handler_id);
if (binding->key_handler_id)
g_signal_handler_disconnect (binding->info.settings,
binding->key_handler_id);
if (g_signal_handler_is_connected (binding->object,
binding->property_handler_id))
g_signal_handler_disconnect (binding->object,
binding->property_handler_id);
g_settings_free_key_info (&binding->info);
if (binding->destroy)
binding->destroy (binding->user_data);
g_slice_free (GSettingsBinding, binding);
}
static GQuark
g_settings_binding_quark (const char *property)
{
GQuark quark;
gchar *tmp;
tmp = g_strdup_printf ("gsettingsbinding-%s", property);
quark = g_quark_from_string (tmp);
g_free (tmp);
return quark;
}
static void
g_settings_binding_key_changed (GSettings *settings,
const gchar *key,
gpointer user_data)
{
GSettingsBinding *binding = user_data;
GValue value = { 0, };
GVariant *variant;
g_assert (settings == binding->info.settings);
g_assert (key == binding->info.key);
if (binding->running)
return;
binding->running = TRUE;
g_value_init (&value, binding->property->value_type);
variant = g_settings_read_from_backend (&binding->info);
if (variant && !binding->get_mapping (&value, variant, binding->user_data))
{
/* silently ignore errors in the user's config database */
g_variant_unref (variant);
variant = NULL;
}
if (variant == NULL)
{
variant = g_settings_get_translated_default (&binding->info);
if (variant &&
!binding->get_mapping (&value, variant, binding->user_data))
{
/* flag translation errors with a warning */
g_warning ("Translated default `%s' for key `%s' in schema `%s' "
"was rejected by the binding mapping function",
binding->info.unparsed, binding->info.key,
binding->info.settings->priv->schema_name);
g_variant_unref (variant);
variant = NULL;
}
}
if (variant == NULL)
{
variant = g_variant_ref (binding->info.default_value);
if (!binding->get_mapping (&value, variant, binding->user_data))
g_error ("The schema default value for key `%s' in schema `%s' "
"was rejected by the binding mapping function.",
binding->info.key,
binding->info.settings->priv->schema_name);
}
g_object_set_property (binding->object, binding->property->name, &value);
g_variant_unref (variant);
g_value_unset (&value);
binding->running = FALSE;
}
static void
g_settings_binding_property_changed (GObject *object,
const GParamSpec *pspec,
gpointer user_data)
{
GSettingsBinding *binding = user_data;
GValue value = { 0, };
GVariant *variant;
g_assert (object == binding->object);
g_assert (pspec == binding->property);
if (binding->running)
return;
binding->running = TRUE;
g_value_init (&value, pspec->value_type);
g_object_get_property (object, pspec->name, &value);
if ((variant = binding->set_mapping (&value, binding->info.type,
binding->user_data)))
{
if (g_variant_is_floating (variant))
g_variant_ref_sink (variant);
if (!g_settings_type_check (&binding->info, variant))
{
g_critical ("binding mapping function for key `%s' returned "
"GVariant of type `%s' when type `%s' was requested",
binding->info.key, g_variant_get_type_string (variant),
g_variant_type_dup_string (binding->info.type));
return;
}
if (!g_settings_range_check (&binding->info, variant))
{
g_critical ("GObject property `%s' on a `%s' object is out of "
"schema-specified range for key `%s' of `%s': %s",
binding->property->name,
g_type_name (binding->property->owner_type),
binding->info.key,
binding->info.settings->priv->schema_name,
g_variant_print (variant, TRUE));
return;
}
g_settings_write_to_backend (&binding->info, variant);
g_variant_unref (variant);
}
g_value_unset (&value);
binding->running = FALSE;
}
/**
* g_settings_bind:
* @settings: a #GSettings object
* @key: the key to bind
* @object: a #GObject
* @property: the name of the property to bind
* @flags: flags for the binding
*
* Create a binding between the @key in the @settings object
* and the property @property of @object.
*
* The binding uses the default GIO mapping functions to map
* between the settings and property values. These functions
* handle booleans, numeric types and string types in a
* straightforward way. Use g_settings_bind_with_mapping() if
* you need a custom mapping, or map between types that are not
* supported by the default mapping functions.
*
* Unless the @flags include %G_SETTINGS_BIND_NO_SENSITIVITY, this
* function also establishes a binding between the writability of
* @key and the "sensitive" property of @object (if @object has
* a boolean property by that name). See g_settings_bind_writable()
* for more details about writable bindings.
*
* Note that the lifecycle of the binding is tied to the object,
* and that you can have only one binding per object property.
* If you bind the same property twice on the same object, the second
* binding overrides the first one.
*
* Since: 2.26
*/
void
g_settings_bind (GSettings *settings,
const gchar *key,
gpointer object,
const gchar *property,
GSettingsBindFlags flags)
{
g_settings_bind_with_mapping (settings, key, object, property,
flags, NULL, NULL, NULL, NULL);
}
/**
* g_settings_bind_with_mapping:
* @settings: a #GSettings object
* @key: the key to bind
* @object: a #GObject
* @property: the name of the property to bind
* @flags: flags for the binding
* @get_mapping: a function that gets called to convert values
* from @settings to @object, or %NULL to use the default GIO mapping
* @set_mapping: a function that gets called to convert values
* from @object to @settings, or %NULL to use the default GIO mapping
* @user_data: data that gets passed to @get_mapping and @set_mapping
* @destroy: #GDestroyNotify function for @user_data
*
* Create a binding between the @key in the @settings object
* and the property @property of @object.
*
* The binding uses the provided mapping functions to map between
* settings and property values.
*
* Note that the lifecycle of the binding is tied to the object,
* and that you can have only one binding per object property.
* If you bind the same property twice on the same object, the second
* binding overrides the first one.
*
* Since: 2.26
*/
void
g_settings_bind_with_mapping (GSettings *settings,
const gchar *key,
gpointer object,
const gchar *property,
GSettingsBindFlags flags,
GSettingsBindGetMapping get_mapping,
GSettingsBindSetMapping set_mapping,
gpointer user_data,
GDestroyNotify destroy)
{
GSettingsBinding *binding;
GObjectClass *objectclass;
gchar *detailed_signal;
GQuark binding_quark;
g_return_if_fail (G_IS_SETTINGS (settings));
objectclass = G_OBJECT_GET_CLASS (object);
binding = g_slice_new0 (GSettingsBinding);
g_settings_get_key_info (&binding->info, settings, key);
binding->object = object;
binding->property = g_object_class_find_property (objectclass, property);
binding->user_data = user_data;
binding->destroy = destroy;
binding->get_mapping = get_mapping ? get_mapping : g_settings_get_mapping;
binding->set_mapping = set_mapping ? set_mapping : g_settings_set_mapping;
if (!(flags & (G_SETTINGS_BIND_GET | G_SETTINGS_BIND_SET)))
flags |= G_SETTINGS_BIND_GET | G_SETTINGS_BIND_SET;
if (binding->property == NULL)
{
g_critical ("g_settings_bind: no property '%s' on class '%s'",
property, G_OBJECT_TYPE_NAME (object));
return;
}
if ((flags & G_SETTINGS_BIND_GET) &&
(binding->property->flags & G_PARAM_WRITABLE) == 0)
{
g_critical ("g_settings_bind: property '%s' on class '%s' is not "
"writable", property, G_OBJECT_TYPE_NAME (object));
return;
}
if ((flags & G_SETTINGS_BIND_SET) &&
(binding->property->flags & G_PARAM_READABLE) == 0)
{
g_critical ("g_settings_bind: property '%s' on class '%s' is not "
"readable", property, G_OBJECT_TYPE_NAME (object));
return;
}
if (((get_mapping == NULL && (flags & G_SETTINGS_BIND_GET)) ||
(set_mapping == NULL && (flags & G_SETTINGS_BIND_SET))) &&
!g_settings_mapping_is_compatible (binding->property->value_type,
binding->info.type))
{
g_critical ("g_settings_bind: property '%s' on class '%s' has type "
"'%s' which is not compatible with type '%s' of key '%s' "
"on schema '%s'", property, G_OBJECT_TYPE_NAME (object),
g_type_name (binding->property->value_type),
g_variant_type_dup_string (binding->info.type), key,
settings->priv->schema_name);
return;
}
if ((flags & G_SETTINGS_BIND_SET) &&
(~flags & G_SETTINGS_BIND_NO_SENSITIVITY))
{
GParamSpec *sensitive;
sensitive = g_object_class_find_property (objectclass, "sensitive");
if (sensitive && sensitive->value_type == G_TYPE_BOOLEAN &&
(sensitive->flags & G_PARAM_WRITABLE))
g_settings_bind_writable (settings, binding->info.key,
object, "sensitive", FALSE);
}
if (flags & G_SETTINGS_BIND_SET)
{
detailed_signal = g_strdup_printf ("notify::%s", property);
binding->property_handler_id =
g_signal_connect (object, detailed_signal,
G_CALLBACK (g_settings_binding_property_changed),
binding);
g_free (detailed_signal);
if (~flags & G_SETTINGS_BIND_GET)
g_settings_binding_property_changed (object,
binding->property,
binding);
}
if (flags & G_SETTINGS_BIND_GET)
{
if (~flags & G_SETTINGS_BIND_GET_NO_CHANGES)
{
detailed_signal = g_strdup_printf ("changed::%s", key);
binding->key_handler_id =
g_signal_connect (settings, detailed_signal,
G_CALLBACK (g_settings_binding_key_changed),
binding);
g_free (detailed_signal);
}
g_settings_binding_key_changed (settings, binding->info.key, binding);
}
binding_quark = g_settings_binding_quark (property);
g_object_set_qdata_full (object, binding_quark,
binding, g_settings_binding_free);
}
/* Writability binding {{{1 */
typedef struct
{
GSettings *settings;
gpointer object;
const gchar *key;
const gchar *property;
gboolean inverted;
gulong handler_id;
} GSettingsWritableBinding;
static void
g_settings_writable_binding_free (gpointer data)
{
GSettingsWritableBinding *binding = data;
g_signal_handler_disconnect (binding->settings, binding->handler_id);
g_object_unref (binding->settings);
g_slice_free (GSettingsWritableBinding, binding);
}
static void
g_settings_binding_writable_changed (GSettings *settings,
const gchar *key,
gpointer user_data)
{
GSettingsWritableBinding *binding = user_data;
gboolean writable;
g_assert (settings == binding->settings);
g_assert (key == binding->key);
writable = g_settings_is_writable (settings, key);
if (binding->inverted)
writable = !writable;
g_object_set (binding->object, binding->property, writable, NULL);
}
/**
* g_settings_bind_writable:
* @settings: a #GSettings object
* @key: the key to bind
* @object: a #GObject
* @property: the name of a boolean property to bind
* @inverted: whether to 'invert' the value
*
* Create a binding between the writability of @key in the
* @settings object and the property @property of @object.
* The property must be boolean; "sensitive" or "visible"
* properties of widgets are the most likely candidates.
*
* Writable bindings are always uni-directional; changes of the
* writability of the setting will be propagated to the object
* property, not the other way.
*
* When the @inverted argument is %TRUE, the binding inverts the
* value as it passes from the setting to the object, i.e. @property
* will be set to %TRUE if the key is <emphasis>not</emphasis>
* writable.
*
* Note that the lifecycle of the binding is tied to the object,
* and that you can have only one binding per object property.
* If you bind the same property twice on the same object, the second
* binding overrides the first one.
*
* Since: 2.26
*/
void
g_settings_bind_writable (GSettings *settings,
const gchar *key,
gpointer object,
const gchar *property,
gboolean inverted)
{
GSettingsWritableBinding *binding;
gchar *detailed_signal;
GParamSpec *pspec;
g_return_if_fail (G_IS_SETTINGS (settings));
pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (object), property);
if (pspec == NULL)
{
g_critical ("g_settings_bind_writable: no property '%s' on class '%s'",
property, G_OBJECT_TYPE_NAME (object));
return;
}
if ((pspec->flags & G_PARAM_WRITABLE) == 0)
{
g_critical ("g_settings_bind_writable: property '%s' on class '%s' is not writable",
property, G_OBJECT_TYPE_NAME (object));
return;
}
binding = g_slice_new (GSettingsWritableBinding);
binding->settings = g_object_ref (settings);
binding->object = object;
binding->key = g_intern_string (key);
binding->property = g_intern_string (property);
binding->inverted = inverted;
detailed_signal = g_strdup_printf ("writable-changed::%s", key);
binding->handler_id =
g_signal_connect (settings, detailed_signal,
G_CALLBACK (g_settings_binding_writable_changed),
binding);
g_free (detailed_signal);
g_object_set_qdata_full (object, g_settings_binding_quark (property),
binding, g_settings_writable_binding_free);
g_settings_binding_writable_changed (settings, binding->key, binding);
}
/**
* g_settings_unbind:
* @object: the object
* @property: the property whose binding is removed
*
* Removes an existing binding for @property on @object.
*
* Note that bindings are automatically removed when the
* object is finalized, so it is rarely necessary to call this
* function.
*
* Since: 2.26
*/
void
g_settings_unbind (gpointer object,
const gchar *property)
{
GQuark binding_quark;
binding_quark = g_settings_binding_quark (property);
g_object_set_qdata (object, binding_quark, NULL);
}
/* Epilogue {{{1 */
/* vim:set foldmethod=marker: */
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