/*
* Copyright © 2009, 2010 Codethink Limited
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see .
*
* Author: Ryan Lortie
*/
/* Prelude {{{1 */
#include "config.h"
#include
#include
#include "gsettings.h"
#include "gdelayedsettingsbackend.h"
#include "gsettingsbackendinternal.h"
#include "gsettings-mapping.h"
#include "gsettingsschema-internal.h"
#include "gaction.h"
#include "gmarshal-internal.h"
#include "strinfo.c"
/**
* GSettings:
*
* The `GSettings` class provides a convenient API for storing and retrieving
* application settings.
*
* Reads and writes can be considered to be non-blocking. Reading
* settings with `GSettings` is typically extremely fast: on
* approximately the same order of magnitude (but slower than) a
* [struct@GLib.HashTable] lookup. Writing settings is also extremely fast in
* terms of time to return to your application, but can be extremely expensive
* for other threads and other processes. Many settings backends
* (including dconf) have lazy initialisation which means in the common
* case of the user using their computer without modifying any settings
* a lot of work can be avoided. For dconf, the D-Bus service doesn’t
* even need to be started in this case. For this reason, you should
* only ever modify `GSettings` keys in response to explicit user action.
* Particular care should be paid to ensure that modifications are not
* made during startup — for example, when setting the initial value
* of preferences widgets. The built-in [method@Gio.Settings.bind]
* functionality is careful not to write settings in response to notify signals
* as a result of modifications that it makes to widgets.
*
* 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 a fixed path that determines where the settings
* are stored in the conceptual global tree of settings. However, schemas
* can also be ‘[relocatable](#relocatable-schemas)’, 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.
*
* Paths must start with and end with a forward slash character (`/`)
* and must not contain two sequential slash characters. Paths should
* be chosen based on a domain name associated with the program or
* library to which the settings belong. Examples of paths are
* `/org/gtk/settings/file-chooser/` and `/ca/desrt/dconf-editor/`.
* Paths should not start with `/apps/`, `/desktop/` or `/system/` as
* they often did in GConf.
*
* Unlike other configuration systems (like GConf), GSettings does not
* restrict keys to basic types like strings and numbers. GSettings stores
* values as [struct@GLib.Variant], and allows any [type@GLib.VariantType] 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.
*
* 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
* `gettext-domain` attribute of the `` or ``
* elements and the category that is specified in the `l10n` attribute of
* the `` element. The string which is translated includes all text in
* the `` element, including any surrounding quotation marks.
*
* The `l10n` attribute must be set to `messages` or `time`, and sets the
* [locale category for
* translation](https://www.gnu.org/software/gettext/manual/html_node/Aspects.html#index-locale-categories-1).
* The `messages` category should be used by default; use `time` for
* translatable date or time formats. A translation comment can be added as an
* XML comment immediately above the `` element — it is recommended to
* add these comments to aid translators understand the meaning and
* implications of the default value. An optional translation `context`
* attribute can be set on the `` element to disambiguate multiple
* defaults which use the same string.
*
* For example:
* ```xml
*
* ['bad', 'words']
* ```
*
* Translations of default values must remain syntactically valid serialized
* [struct@GLib.Variant]s (e.g. retaining any surrounding quotation marks) or
* runtime errors will occur.
*
* GSettings uses schemas in a compact binary form that is created
* by the [`glib-compile-schemas`](glib-compile-schemas.html)
* utility. The input is a schema description in an XML format.
*
* A DTD for the gschema XML format can be found here:
* [gschema.dtd](https://gitlab.gnome.org/GNOME/glib/-/blob/HEAD/gio/gschema.dtd)
*
* The [`glib-compile-schemas`](glib-compile-schemas.html) tool expects schema
* files to have the extension `.gschema.xml`.
*
* At runtime, schemas are identified by their ID (as specified in the
* `id` attribute of the `` element). The convention for schema
* IDs is to use a dotted name, similar in style to a D-Bus bus name,
* e.g. `org.gnome.SessionManager`. In particular, if the settings are
* for a specific service that owns a D-Bus bus name, the D-Bus bus name
* and schema ID should match. For schemas which deal with settings not
* associated with one named application, the ID should not use
* StudlyCaps, e.g. `org.gnome.font-rendering`.
*
* In addition to [struct@GLib.Variant] types, keys can have types that have
* enumerated types. These can be described by a ``,
* `` or `` element, as seen in the
* second example below. The underlying type of such a key
* is string, but you can use [method@Gio.Settings.get_enum],
* [method@Gio.Settings.set_enum], [method@Gio.Settings.get_flags],
* [method@Gio.Settings.set_flags] access the numeric values corresponding to
* the string value of enum and flags keys.
*
* An example for default value:
* ```xml
*
*
*
*
* "Hello, earthlings"
* A greeting
*
* Greeting of the invading martians
*
*
*
*
* (20,30)
*
*
*
* ""
* Empty strings have to be provided in GVariant form
*
*
*
*
* ```
*
* An example for ranges, choices and enumerated types:
* ```xml
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
* 10
*
*
*
*
*
*
*
*
*
*
*
*
* 'Joe'
*
*
*
* 'first'
*
*
*
* ["flag1","flag2"]
*
*
*
* ```
*
* ## Vendor overrides
*
* Default values are defined in the schemas that get installed by
* an application. Sometimes, it is necessary for a vendor or distributor
* to adjust these defaults. Since patching the XML source for the schema
* is inconvenient and error-prone,
* [`glib-compile-schemas`](glib-compile-schemas.html) reads so-called ‘vendor
* override’ files. These are keyfiles in the same directory as the XML
* schema sources which can override default values. The schema ID serves
* as the group name in the key file, and the values are expected in
* serialized [struct@GLib.Variant] form, as in the following example:
* ```
* [org.gtk.Example]
* key1='string'
* key2=1.5
* ```
*
* `glib-compile-schemas` expects schema files to have the extension
* `.gschema.override`.
*
* ## Binding
*
* A very convenient feature of GSettings lets you bind [class@GObject.Object]
* properties directly to settings, using [method@Gio.Settings.bind]. Once a
* [class@GObject.Object] property has been bound to a setting, changes on
* either side are automatically propagated to the other side. GSettings handles
* details like mapping between [class@GObject.Object] and [struct@GLib.Variant]
* types, and preventing infinite cycles.
*
* 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.
*
* ## Relocatable schemas
*
* A relocatable schema is one with no `path` attribute specified on its
* `` element. By using [ctor@Gio.Settings.new_with_path], a `GSettings`
* object can be instantiated for a relocatable schema, assigning a path to the
* instance. Paths passed to [ctor@Gio.Settings.new_with_path] will typically be
* constructed dynamically from a constant prefix plus some form of instance
* identifier; but they must still be valid GSettings paths. Paths could also
* be constant and used with a globally installed schema originating from a
* dependency library.
*
* For example, a relocatable schema could be used to store geometry information
* for different windows in an application. If the schema ID was
* `org.foo.MyApp.Window`, it could be instantiated for paths
* `/org/foo/MyApp/main/`, `/org/foo/MyApp/document-1/`,
* `/org/foo/MyApp/document-2/`, etc. If any of the paths are well-known
* they can be specified as `` elements in the parent schema, e.g.:
* ```xml
*
*
*
* ```
*
* ## Build system integration
*
* GSettings comes with autotools integration to simplify compiling and
* installing schemas. To add GSettings support to an application, add the
* following to your `configure.ac`:
* ```
* GLIB_GSETTINGS
* ```
*
* In the appropriate `Makefile.am`, use the following snippet to compile and
* install the named schema:
* ```
* gsettings_SCHEMAS = org.foo.MyApp.gschema.xml
* EXTRA_DIST = $(gsettings_SCHEMAS)
*
* @GSETTINGS_RULES@
* ```
*
* No changes are needed to the build system to mark a schema XML file for
* translation. Assuming it sets the `gettext-domain` attribute, a schema may
* be marked for translation by adding it to `POTFILES.in`, assuming gettext
* 0.19 is in use (the preferred method for translation):
* ```
* data/org.foo.MyApp.gschema.xml
* ```
*
* Alternatively, if intltool 0.50.1 is in use:
* ```
* [type: gettext/gsettings]data/org.foo.MyApp.gschema.xml
* ```
*
* GSettings will use gettext to look up translations for the `` and
* `` elements, and also any `` elements which have a
* `l10n` attribute set. Translations must not be included in the `.gschema.xml`
* file by the build system, for example by using intltool XML rules with a
* `.gschema.xml.in` template.
*
* If an enumerated type defined in a C header file is to be used in a GSettings
* schema, it can either be defined manually using an `` element in the
* schema XML, or it can be extracted automatically from the C header. This
* approach is preferred, as it ensures the two representations are always
* synchronised. To do so, add the following to the relevant `Makefile.am`:
* ```
* gsettings_ENUM_NAMESPACE = org.foo.MyApp
* gsettings_ENUM_FILES = my-app-enums.h my-app-misc.h
* ```
*
* `gsettings_ENUM_NAMESPACE` specifies the schema namespace for the enum files,
* which are specified in `gsettings_ENUM_FILES`. This will generate a
* `org.foo.MyApp.enums.xml` file containing the extracted enums, which will be
* automatically included in the schema compilation, install and uninstall
* rules. It should not be committed to version control or included in
* `EXTRA_DIST`.
*/
struct _GSettingsPrivate
{
/* where the signals go... */
GMainContext *main_context;
GSettingsBackend *backend;
GSettingsSchema *schema;
gchar *path;
};
enum
{
PROP_0,
PROP_SCHEMA,
PROP_SCHEMA_ID,
PROP_BACKEND,
PROP_PATH,
PROP_HAS_UNAPPLIED,
PROP_DELAY_APPLY
};
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_WITH_PRIVATE (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++)
{
const gchar *key = g_quark_to_string (keys[i]);
if (g_str_has_suffix (key, "/"))
continue;
g_signal_emit (settings, g_settings_signals[SIGNAL_CHANGED], keys[i], key);
}
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 *key_name = g_quark_to_string (keys[i]);
if (g_str_has_suffix (key_name, "/"))
continue;
g_signal_emit (settings, g_settings_signals[SIGNAL_WRITABLE_CHANGED], keys[i], key_name);
}
return FALSE;
}
static void
settings_backend_changed (GObject *target,
GSettingsBackend *backend,
const gchar *key,
gpointer origin_tag)
{
GSettings *settings = G_SETTINGS (target);
gboolean ignore_this;
gint i;
/* We used to assert here:
*
* settings->priv->backend == backend
*
* but it could be the case that a notification is queued for delivery
* while someone calls g_settings_delay() (which changes the backend).
*
* Since the delay backend would just pass that straight through
* anyway, it doesn't make sense to try to detect this case.
* Therefore, we just accept it.
*/
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 (GObject *target,
GSettingsBackend *backend,
const gchar *path,
gpointer origin_tag)
{
GSettings *settings = G_SETTINGS (target);
gboolean ignore_this;
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 (GObject *target,
GSettingsBackend *backend,
const gchar *path,
gpointer origin_tag,
const gchar * const *items)
{
GSettings *settings = G_SETTINGS (target);
gboolean ignore_this;
gint i;
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 (GObject *target,
GSettingsBackend *backend,
const gchar *key)
{
GSettings *settings = G_SETTINGS (target);
gboolean ignore_this;
gint i;
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 (GObject *target,
GSettingsBackend *backend,
const gchar *path)
{
GSettings *settings = G_SETTINGS (target);
gboolean ignore_this;
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:
{
GSettingsSchema *schema;
schema = g_value_dup_boxed (value);
/* we receive a set_property() call for "settings-schema" even
* if it was not specified (ie: with NULL value). ->schema
* could already be set at this point (ie: via "schema-id").
* check for NULL to avoid clobbering the existing value.
*/
if (schema != NULL)
{
g_assert (settings->priv->schema == NULL);
settings->priv->schema = schema;
}
}
break;
case PROP_SCHEMA_ID:
{
const gchar *schema_id;
schema_id = g_value_get_string (value);
/* we receive a set_property() call for both "schema" and
* "schema-id", even if they are not set. Hopefully only one of
* them is non-NULL.
*/
if (schema_id != NULL)
{
GSettingsSchemaSource *default_source;
g_assert (settings->priv->schema == NULL);
default_source = g_settings_schema_source_get_default ();
if (default_source == NULL)
g_error ("No GSettings schemas are installed on the system");
settings->priv->schema = g_settings_schema_source_lookup (default_source, schema_id, TRUE);
if (settings->priv->schema == NULL)
g_error ("Settings schema '%s' is not installed", schema_id);
}
}
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_boxed (value, settings->priv->schema);
break;
case PROP_SCHEMA_ID:
g_value_set_string (value, g_settings_schema_get_id (settings->priv->schema));
break;
case PROP_BACKEND:
g_value_set_object (value, settings->priv->backend);
break;
case PROP_PATH:
g_value_set_string (value, settings->priv->path);
break;
case PROP_HAS_UNAPPLIED:
g_value_set_boolean (value, g_settings_get_has_unapplied (settings));
break;
case PROP_DELAY_APPLY:
g_value_set_boolean (value, G_IS_DELAYED_SETTINGS_BACKEND (settings->priv->backend));
break;
default:
g_assert_not_reached ();
}
}
static const GSettingsListenerVTable listener_vtable = {
settings_backend_changed,
settings_backend_path_changed,
settings_backend_keys_changed,
settings_backend_writable_changed,
settings_backend_path_writable_changed
};
static void
g_settings_constructed (GObject *object)
{
GSettings *settings = G_SETTINGS (object);
const gchar *schema_path;
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",
g_settings_schema_get_id (settings->priv->schema), settings->priv->path, schema_path);
if (settings->priv->path == NULL)
{
if (schema_path == NULL)
g_error ("attempting to create schema '%s' without a path",
g_settings_schema_get_id (settings->priv->schema));
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,
&listener_vtable, G_OBJECT (settings),
settings->priv->main_context);
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_settings_schema_unref (settings->priv->schema);
g_free (settings->priv->path);
G_OBJECT_CLASS (g_settings_parent_class)->finalize (object);
}
static void
g_settings_init (GSettings *settings)
{
settings->priv = g_settings_get_instance_private (settings);
settings->priv->main_context = g_main_context_ref_thread_default ();
}
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;
/**
* 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.
*
* Note that @settings only emits this signal if you have read @key at
* least once while a signal handler was already connected for @key.
*/
g_settings_signals[SIGNAL_CHANGED] =
g_signal_new (I_("changed"), G_TYPE_SETTINGS,
G_SIGNAL_RUN_LAST | G_SIGNAL_DETAILED,
G_STRUCT_OFFSET (GSettingsClass, changed),
NULL, NULL, NULL, 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: (array length=n_keys) (element-type GQuark) (nullable):
* an array of #GQuarks for the changed keys, or %NULL
* @n_keys: the length of the @keys array, or 0
*
* 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 suppressed.
*
* Returns: %TRUE to stop other handlers from being invoked for the
* event. FALSE to propagate the event further.
*/
g_settings_signals[SIGNAL_CHANGE_EVENT] =
g_signal_new (I_("change-event"), G_TYPE_SETTINGS,
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GSettingsClass, change_event),
g_signal_accumulator_true_handled, NULL,
_g_cclosure_marshal_BOOLEAN__POINTER_INT,
G_TYPE_BOOLEAN, 2, G_TYPE_POINTER, G_TYPE_INT);
g_signal_set_va_marshaller (g_settings_signals[SIGNAL_CHANGE_EVENT],
G_TYPE_FROM_CLASS (class),
_g_cclosure_marshal_BOOLEAN__POINTER_INTv);
/**
* 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 (I_("writable-changed"), G_TYPE_SETTINGS,
G_SIGNAL_RUN_LAST | G_SIGNAL_DETAILED,
G_STRUCT_OFFSET (GSettingsClass, writable_changed),
NULL, NULL, NULL, 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
*
* 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 suppressed.
*
* Returns: %TRUE to stop other handlers from being invoked for the
* event. FALSE to propagate the event further.
*/
g_settings_signals[SIGNAL_WRITABLE_CHANGE_EVENT] =
g_signal_new (I_("writable-change-event"), G_TYPE_SETTINGS,
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GSettingsClass, writable_change_event),
g_signal_accumulator_true_handled, NULL,
_g_cclosure_marshal_BOOLEAN__UINT,
G_TYPE_BOOLEAN, 1, G_TYPE_UINT);
g_signal_set_va_marshaller (g_settings_signals[SIGNAL_WRITABLE_CHANGE_EVENT],
G_TYPE_FROM_CLASS (class),
_g_cclosure_marshal_BOOLEAN__UINTv);
/**
* GSettings:backend:
*
* 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:settings-schema:
*
* The #GSettingsSchema describing the types of keys for this
* #GSettings object.
*
* Ideally, this property would be called 'schema'. #GSettingsSchema
* has only existed since version 2.32, however, and before then the
* 'schema' property was used to refer to the ID of the schema rather
* than the schema itself. Take care.
*/
g_object_class_install_property (object_class, PROP_SCHEMA,
g_param_spec_boxed ("settings-schema",
P_("schema"),
P_("The GSettingsSchema for this settings object"),
G_TYPE_SETTINGS_SCHEMA,
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.
*
* The type of this property is *not* #GSettingsSchema.
* #GSettingsSchema has only existed since version 2.32 and
* unfortunately this name was used in previous versions to refer to
* the schema ID rather than the schema itself. Take care to use the
* 'settings-schema' property if you wish to pass in a
* #GSettingsSchema.
*
* Deprecated:2.32:Use the 'schema-id' property instead. In a future
* version, this property may instead refer to a #GSettingsSchema.
*/
g_object_class_install_property (object_class, PROP_SCHEMA_ID,
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_DEPRECATED | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GSettings:schema-id:
*
* The name of the schema that describes the types of keys
* for this #GSettings object.
*/
g_object_class_install_property (object_class, PROP_SCHEMA_ID,
g_param_spec_string ("schema-id",
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));
/**
* GSettings:delay-apply:
*
* Whether the #GSettings object is in 'delay-apply' mode. See
* g_settings_delay() for details.
*
* Since: 2.28
*/
g_object_class_install_property (object_class, PROP_DELAY_APPLY,
g_param_spec_boolean ("delay-apply",
P_("Delay-apply mode"),
P_("Whether this settings object is in “delay-apply” mode"),
FALSE,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
}
/* Construction (new, new_with_path, etc.) {{{1 */
/**
* g_settings_new:
* @schema_id: the id of the schema
*
* Creates a new #GSettings object with the schema specified by
* @schema_id.
*
* It is an error for the schema to not exist: schemas are an
* essential part of a program, as they provide type information.
* If schemas need to be dynamically loaded (for example, from an
* optional runtime dependency), g_settings_schema_source_lookup()
* can be used to test for their existence before loading them.
*
* 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().
*
* Returns: (not nullable) (transfer full): a new #GSettings object
*
* Since: 2.26
*/
GSettings *
g_settings_new (const gchar *schema_id)
{
g_return_val_if_fail (schema_id != NULL, NULL);
return g_object_new (G_TYPE_SETTINGS,
"schema-id", schema_id,
NULL);
}
static gboolean
path_is_valid (const gchar *path)
{
if (!path)
return FALSE;
if (path[0] != '/')
return FALSE;
if (!g_str_has_suffix (path, "/"))
return FALSE;
return strstr (path, "//") == NULL;
}
/**
* g_settings_new_with_path:
* @schema_id: the id of the schema
* @path: the path to use
*
* Creates a new #GSettings object with the relocatable schema specified
* by @schema_id and a given 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.
*
* It is a programmer error if @path is not a valid path. A valid path
* begins and ends with '/' and does not contain two consecutive '/'
* characters.
*
* Returns: (not nullable) (transfer full): a new #GSettings object
*
* Since: 2.26
*/
GSettings *
g_settings_new_with_path (const gchar *schema_id,
const gchar *path)
{
g_return_val_if_fail (schema_id != NULL, NULL);
g_return_val_if_fail (path_is_valid (path), NULL);
return g_object_new (G_TYPE_SETTINGS,
"schema-id", schema_id,
"path", path,
NULL);
}
/**
* g_settings_new_with_backend:
* @schema_id: the id of the schema
* @backend: the #GSettingsBackend to use
*
* Creates a new #GSettings object with the schema specified by
* @schema_id and a given #GSettingsBackend.
*
* Creating a #GSettings object with a 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.
*
* Returns: (not nullable) (transfer full): a new #GSettings object
*
* Since: 2.26
*/
GSettings *
g_settings_new_with_backend (const gchar *schema_id,
GSettingsBackend *backend)
{
g_return_val_if_fail (schema_id != NULL, NULL);
g_return_val_if_fail (G_IS_SETTINGS_BACKEND (backend), NULL);
return g_object_new (G_TYPE_SETTINGS,
"schema-id", schema_id,
"backend", backend,
NULL);
}
/**
* g_settings_new_with_backend_and_path:
* @schema_id: the id of the schema
* @backend: the #GSettingsBackend to use
* @path: the path to use
*
* Creates a new #GSettings object with the schema specified by
* @schema_id and a given #GSettingsBackend and path.
*
* This is a mix of g_settings_new_with_backend() and
* g_settings_new_with_path().
*
* Returns: (not nullable) (transfer full): a new #GSettings object
*
* Since: 2.26
*/
GSettings *
g_settings_new_with_backend_and_path (const gchar *schema_id,
GSettingsBackend *backend,
const gchar *path)
{
g_return_val_if_fail (schema_id != NULL, NULL);
g_return_val_if_fail (G_IS_SETTINGS_BACKEND (backend), NULL);
g_return_val_if_fail (path_is_valid (path), NULL);
return g_object_new (G_TYPE_SETTINGS,
"schema-id", schema_id,
"backend", backend,
"path", path,
NULL);
}
/**
* g_settings_new_full:
* @schema: a #GSettingsSchema
* @backend: (nullable): a #GSettingsBackend
* @path: (nullable): the path to use
*
* Creates a new #GSettings object with a given schema, backend and
* path.
*
* It should be extremely rare that you ever want to use this function.
* It is made available for advanced use-cases (such as plugin systems
* that want to provide access to schemas loaded from custom locations,
* etc).
*
* At the most basic level, a #GSettings object is a pure composition of
* 4 things: a #GSettingsSchema, a #GSettingsBackend, a path within that
* backend, and a #GMainContext to which signals are dispatched.
*
* This constructor therefore gives you full control over constructing
* #GSettings instances. The first 3 parameters are given directly as
* @schema, @backend and @path, and the main context is taken from the
* thread-default (as per g_settings_new()).
*
* If @backend is %NULL then the default backend is used.
*
* If @path is %NULL then the path from the schema is used. It is an
* error if @path is %NULL and the schema has no path of its own or if
* @path is non-%NULL and not equal to the path that the schema does
* have.
*
* Returns: (not nullable) (transfer full): a new #GSettings object
*
* Since: 2.32
*/
GSettings *
g_settings_new_full (GSettingsSchema *schema,
GSettingsBackend *backend,
const gchar *path)
{
g_return_val_if_fail (schema != NULL, NULL);
g_return_val_if_fail (backend == NULL || G_IS_SETTINGS_BACKEND (backend), NULL);
g_return_val_if_fail (path == NULL || path_is_valid (path), NULL);
return g_object_new (G_TYPE_SETTINGS,
"settings-schema", schema,
"backend", backend,
"path", path,
NULL);
}
/* Internal read/write utilities {{{1 */
/* @value will be sunk */
static gboolean
g_settings_write_to_backend (GSettings *settings,
GSettingsSchemaKey *key,
GVariant *value)
{
gboolean success;
gchar *path;
path = g_strconcat (settings->priv->path, key->name, NULL);
success = g_settings_backend_write (settings->priv->backend, path, value, NULL);
g_free (path);
return success;
}
static GVariant *
g_settings_read_from_backend (GSettings *settings,
GSettingsSchemaKey *key,
gboolean user_value_only,
gboolean default_value)
{
GVariant *value;
GVariant *fixup;
gchar *path;
path = g_strconcat (settings->priv->path, key->name, NULL);
if (user_value_only)
value = g_settings_backend_read_user_value (settings->priv->backend, path, key->type);
else
value = g_settings_backend_read (settings->priv->backend, path, key->type, default_value);
g_free (path);
if (value != NULL)
{
fixup = g_settings_schema_key_range_fixup (key, value);
g_variant_unref (value);
}
else
fixup = NULL;
return fixup;
}
/* 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
*
* 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.
*
* Returns: (not nullable) (transfer full): a new #GVariant
*
* Since: 2.26
*/
GVariant *
g_settings_get_value (GSettings *settings,
const gchar *key)
{
GSettingsSchemaKey skey;
GVariant *value;
g_return_val_if_fail (G_IS_SETTINGS (settings), NULL);
g_return_val_if_fail (key != NULL, NULL);
g_settings_schema_key_init (&skey, settings->priv->schema, key);
value = g_settings_read_from_backend (settings, &skey, FALSE, FALSE);
if (value == NULL)
value = g_settings_schema_key_get_default_value (&skey);
g_settings_schema_key_clear (&skey);
return value;
}
/**
* g_settings_get_user_value:
* @settings: a #GSettings object
* @key: the key to get the user value for
*
* Checks the "user value" of a key, if there is one.
*
* The user value of a key is the last value that was set by the user.
*
* After calling g_settings_reset() this function should always return
* %NULL (assuming something is not wrong with the system
* configuration).
*
* It is possible that g_settings_get_value() will return a different
* value than this function. This can happen in the case that the user
* set a value for a key that was subsequently locked down by the system
* administrator -- this function will return the user's old value.
*
* This function may be useful for adding a "reset" option to a UI or
* for providing indication that a particular value has been changed.
*
* It is a programmer error to give a @key that isn't contained in the
* schema for @settings.
*
* Returns: (nullable) (transfer full): the user's value, if set
*
* Since: 2.40
**/
GVariant *
g_settings_get_user_value (GSettings *settings,
const gchar *key)
{
GSettingsSchemaKey skey;
GVariant *value;
g_return_val_if_fail (G_IS_SETTINGS (settings), NULL);
g_return_val_if_fail (key != NULL, NULL);
g_settings_schema_key_init (&skey, settings->priv->schema, key);
value = g_settings_read_from_backend (settings, &skey, TRUE, FALSE);
g_settings_schema_key_clear (&skey);
return value;
}
/**
* g_settings_get_default_value:
* @settings: a #GSettings object
* @key: the key to get the default value for
*
* Gets the "default value" of a key.
*
* This is the value that would be read if g_settings_reset() were to be
* called on the key.
*
* Note that this may be a different value than returned by
* g_settings_schema_key_get_default_value() if the system administrator
* has provided a default value.
*
* Comparing the return values of g_settings_get_default_value() and
* g_settings_get_value() is not sufficient for determining if a value
* has been set because the user may have explicitly set the value to
* something that happens to be equal to the default. The difference
* here is that if the default changes in the future, the user's key
* will still be set.
*
* This function may be useful for adding an indication to a UI of what
* the default value was before the user set it.
*
* It is a programmer error to give a @key that isn't contained in the
* schema for @settings.
*
* Returns: (nullable) (transfer full): the default value
*
* Since: 2.40
**/
GVariant *
g_settings_get_default_value (GSettings *settings,
const gchar *key)
{
GSettingsSchemaKey skey;
GVariant *value;
g_return_val_if_fail (G_IS_SETTINGS (settings), NULL);
g_return_val_if_fail (key != NULL, NULL);
g_settings_schema_key_init (&skey, settings->priv->schema, key);
value = g_settings_read_from_backend (settings, &skey, FALSE, TRUE);
if (value == NULL)
value = g_settings_schema_key_get_default_value (&skey);
g_settings_schema_key_clear (&skey);
return value;
}
/**
* g_settings_get_enum:
* @settings: a #GSettings object
* @key: the key to get the value for
*
* 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.
*
* Returns: the enum value
*
* Since: 2.26
**/
gint
g_settings_get_enum (GSettings *settings,
const gchar *key)
{
GSettingsSchemaKey skey;
GVariant *value;
gint result;
g_return_val_if_fail (G_IS_SETTINGS (settings), -1);
g_return_val_if_fail (key != NULL, -1);
g_settings_schema_key_init (&skey, settings->priv->schema, key);
if (!skey.is_enum)
{
g_critical ("g_settings_get_enum() called on key '%s' which is not "
"associated with an enumerated type", skey.name);
g_settings_schema_key_clear (&skey);
return -1;
}
value = g_settings_read_from_backend (settings, &skey, FALSE, FALSE);
if (value == NULL)
value = g_settings_schema_key_get_default_value (&skey);
result = g_settings_schema_key_to_enum (&skey, value);
g_settings_schema_key_clear (&skey);
g_variant_unref (value);
return result;
}
/**
* g_settings_set_enum:
* @settings: a #GSettings object
* @key: a key, within @settings
* @value: an enumerated value
*
* 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.
*
* Returns: %TRUE, if the set succeeds
**/
gboolean
g_settings_set_enum (GSettings *settings,
const gchar *key,
gint value)
{
GSettingsSchemaKey skey;
GVariant *variant;
gboolean success;
g_return_val_if_fail (G_IS_SETTINGS (settings), FALSE);
g_return_val_if_fail (key != NULL, FALSE);
g_settings_schema_key_init (&skey, settings->priv->schema, key);
if (!skey.is_enum)
{
g_critical ("g_settings_set_enum() called on key '%s' which is not "
"associated with an enumerated type", skey.name);
return FALSE;
}
if (!(variant = g_settings_schema_key_from_enum (&skey, value)))
{
g_critical ("g_settings_set_enum(): invalid enum value %d for key '%s' "
"in schema '%s'. Doing nothing.", value, skey.name,
g_settings_schema_get_id (skey.schema));
g_settings_schema_key_clear (&skey);
return FALSE;
}
success = g_settings_write_to_backend (settings, &skey, g_steal_pointer (&variant));
g_settings_schema_key_clear (&skey);
return success;
}
/**
* g_settings_get_flags:
* @settings: a #GSettings object
* @key: the key to get the value for
*
* 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 a 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.
*
* Returns: the flags value
*
* Since: 2.26
**/
guint
g_settings_get_flags (GSettings *settings,
const gchar *key)
{
GSettingsSchemaKey skey;
GVariant *value;
guint result;
g_return_val_if_fail (G_IS_SETTINGS (settings), -1);
g_return_val_if_fail (key != NULL, -1);
g_settings_schema_key_init (&skey, settings->priv->schema, key);
if (!skey.is_flags)
{
g_critical ("g_settings_get_flags() called on key '%s' which is not "
"associated with a flags type", skey.name);
g_settings_schema_key_clear (&skey);
return -1;
}
value = g_settings_read_from_backend (settings, &skey, FALSE, FALSE);
if (value == NULL)
value = g_settings_schema_key_get_default_value (&skey);
result = g_settings_schema_key_to_flags (&skey, value);
g_settings_schema_key_clear (&skey);
g_variant_unref (value);
return result;
}
/**
* g_settings_set_flags:
* @settings: a #GSettings object
* @key: a key, within @settings
* @value: a flags value
*
* 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, 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 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.
*
* Returns: %TRUE, if the set succeeds
**/
gboolean
g_settings_set_flags (GSettings *settings,
const gchar *key,
guint value)
{
GSettingsSchemaKey skey;
GVariant *variant;
gboolean success;
g_return_val_if_fail (G_IS_SETTINGS (settings), FALSE);
g_return_val_if_fail (key != NULL, FALSE);
g_settings_schema_key_init (&skey, settings->priv->schema, key);
if (!skey.is_flags)
{
g_critical ("g_settings_set_flags() called on key '%s' which is not "
"associated with a flags type", skey.name);
return FALSE;
}
if (!(variant = g_settings_schema_key_from_flags (&skey, value)))
{
g_critical ("g_settings_set_flags(): invalid flags value 0x%08x "
"for key '%s' in schema '%s'. Doing nothing.",
value, skey.name, g_settings_schema_get_id (skey.schema));
g_settings_schema_key_clear (&skey);
return FALSE;
}
success = g_settings_write_to_backend (settings, &skey, g_steal_pointer (&variant));
g_settings_schema_key_clear (&skey);
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
*
* 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.
*
* Returns: %TRUE if setting the key succeeded,
* %FALSE if the key was not writable
*
* Since: 2.26
**/
gboolean
g_settings_set_value (GSettings *settings,
const gchar *key,
GVariant *value)
{
GSettingsSchemaKey skey;
gboolean success;
g_return_val_if_fail (G_IS_SETTINGS (settings), FALSE);
g_return_val_if_fail (key != NULL, FALSE);
g_variant_ref_sink (value);
g_settings_schema_key_init (&skey, settings->priv->schema, key);
if (!g_settings_schema_key_type_check (&skey, value))
{
g_critical ("g_settings_set_value: key '%s' in '%s' expects type '%s', but a GVariant of type '%s' was given",
key,
g_settings_schema_get_id (settings->priv->schema),
g_variant_type_peek_string (skey.type),
g_variant_get_type_string (value));
success = FALSE;
}
else if (!g_settings_schema_key_range_check (&skey, value))
{
g_warning ("g_settings_set_value: value for key '%s' in schema '%s' "
"is outside of valid range",
key,
g_settings_schema_get_id (settings->priv->schema));
success = FALSE;
}
else
{
success = g_settings_write_to_backend (settings, &skey, value);
}
g_settings_schema_key_clear (&skey);
g_variant_unref (value);
return success;
}
/**
* 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);
if (strchr (format, '&'))
{
g_critical ("%s: the format string may not contain '&' (key '%s' from schema '%s'). "
"This call will probably stop working with a future version of glib.",
G_STRFUNC, key, g_settings_schema_get_id (settings->priv->schema));
}
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
*
* 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.
*
* Returns: %TRUE if setting the key succeeded,
* %FALSE if the key was not writable
*
* 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, g_steal_pointer (&value));
}
/**
* g_settings_get_mapped:
* @settings: a #GSettings object
* @key: the key to get the value for
* @mapping: (scope call): 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.
*
* Returns: (nullable) (transfer full): the result, which may be %NULL
**/
gpointer
g_settings_get_mapped (GSettings *settings,
const gchar *key,
GSettingsGetMapping mapping,
gpointer user_data)
{
gpointer result = NULL;
GSettingsSchemaKey skey;
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_schema_key_init (&skey, settings->priv->schema, key);
if ((value = g_settings_read_from_backend (settings, &skey, FALSE, FALSE)))
{
okay = mapping (value, &result, user_data);
g_variant_unref (value);
if (okay) goto okay;
}
if ((value = g_settings_schema_key_get_translated_default (&skey)))
{
okay = mapping (value, &result, user_data);
g_variant_unref (value);
if (okay) goto okay;
}
if ((value = g_settings_schema_key_get_per_desktop_default (&skey)))
{
okay = mapping (value, &result, user_data);
g_variant_unref (value);
if (okay) goto okay;
}
if (mapping (skey.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, g_settings_schema_get_id (settings->priv->schema));
okay:
g_settings_schema_key_clear (&skey);
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
*
* 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.
*
* Returns: (not nullable) (transfer full): a newly-allocated string
*
* 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
*
* 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.
*
* Returns: %TRUE if setting the key succeeded,
* %FALSE if the key was not writable
*
* 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
*
* 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.
*
* Returns: an integer
*
* 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
*
* 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.
*
* Returns: %TRUE if setting the key succeeded,
* %FALSE if the key was not writable
*
* 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_int64:
* @settings: a #GSettings object
* @key: the key to get the value for
*
* Gets the value that is stored at @key in @settings.
*
* A convenience variant of g_settings_get() for 64-bit integers.
*
* It is a programmer error to give a @key that isn't specified as
* having a int64 type in the schema for @settings.
*
* Returns: a 64-bit integer
*
* Since: 2.50
*/
gint64
g_settings_get_int64 (GSettings *settings,
const gchar *key)
{
GVariant *value;
gint64 result;
value = g_settings_get_value (settings, key);
result = g_variant_get_int64 (value);
g_variant_unref (value);
return result;
}
/**
* g_settings_set_int64:
* @settings: a #GSettings object
* @key: the name of the key to set
* @value: the value to set it to
*
* Sets @key in @settings to @value.
*
* A convenience variant of g_settings_set() for 64-bit integers.
*
* It is a programmer error to give a @key that isn't specified as
* having a int64 type in the schema for @settings.
*
* Returns: %TRUE if setting the key succeeded,
* %FALSE if the key was not writable
*
* Since: 2.50
*/
gboolean
g_settings_set_int64 (GSettings *settings,
const gchar *key,
gint64 value)
{
return g_settings_set_value (settings, key, g_variant_new_int64 (value));
}
/**
* g_settings_get_uint:
* @settings: a #GSettings object
* @key: the key to get the value for
*
* Gets the value that is stored at @key in @settings.
*
* A convenience variant of g_settings_get() for 32-bit unsigned
* integers.
*
* It is a programmer error to give a @key that isn't specified as
* having a uint32 type in the schema for @settings.
*
* Returns: an unsigned integer
*
* Since: 2.30
*/
guint
g_settings_get_uint (GSettings *settings,
const gchar *key)
{
GVariant *value;
guint result;
value = g_settings_get_value (settings, key);
result = g_variant_get_uint32 (value);
g_variant_unref (value);
return result;
}
/**
* g_settings_set_uint:
* @settings: a #GSettings object
* @key: the name of the key to set
* @value: the value to set it to
*
* Sets @key in @settings to @value.
*
* A convenience variant of g_settings_set() for 32-bit unsigned
* integers.
*
* It is a programmer error to give a @key that isn't specified as
* having a uint32 type in the schema for @settings.
*
* Returns: %TRUE if setting the key succeeded,
* %FALSE if the key was not writable
*
* Since: 2.30
*/
gboolean
g_settings_set_uint (GSettings *settings,
const gchar *key,
guint value)
{
return g_settings_set_value (settings, key, g_variant_new_uint32 (value));
}
/**
* g_settings_get_uint64:
* @settings: a #GSettings object
* @key: the key to get the value for
*
* Gets the value that is stored at @key in @settings.
*
* A convenience variant of g_settings_get() for 64-bit unsigned
* integers.
*
* It is a programmer error to give a @key that isn't specified as
* having a uint64 type in the schema for @settings.
*
* Returns: a 64-bit unsigned integer
*
* Since: 2.50
*/
guint64
g_settings_get_uint64 (GSettings *settings,
const gchar *key)
{
GVariant *value;
guint64 result;
value = g_settings_get_value (settings, key);
result = g_variant_get_uint64 (value);
g_variant_unref (value);
return result;
}
/**
* g_settings_set_uint64:
* @settings: a #GSettings object
* @key: the name of the key to set
* @value: the value to set it to
*
* Sets @key in @settings to @value.
*
* A convenience variant of g_settings_set() for 64-bit unsigned
* integers.
*
* It is a programmer error to give a @key that isn't specified as
* having a uint64 type in the schema for @settings.
*
* Returns: %TRUE if setting the key succeeded,
* %FALSE if the key was not writable
*
* Since: 2.50
*/
gboolean
g_settings_set_uint64 (GSettings *settings,
const gchar *key,
guint64 value)
{
return g_settings_set_value (settings, key, g_variant_new_uint64 (value));
}
/**
* g_settings_get_double:
* @settings: a #GSettings object
* @key: the key to get the value for
*
* 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.
*
* Returns: a double
*
* 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
*
* 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.
*
* Returns: %TRUE if setting the key succeeded,
* %FALSE if the key was not writable
*
* 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
*
* 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.
*
* Returns: a boolean
*
* 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
*
* 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.
*
* Returns: %TRUE if setting the key succeeded,
* %FALSE if the key was not writable
*
* 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
*
* 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.
*
* Returns: (array zero-terminated=1) (not nullable) (transfer full): a
* newly-allocated, %NULL-terminated array of strings, the value that
* is stored at @key in @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: (nullable) (array zero-terminated=1): the value to set it to, or %NULL
*
* 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.
*
* Returns: %TRUE if setting the key succeeded,
* %FALSE if the key was not writable
*
* 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)
{
GDelayedSettingsBackend *delayed = NULL;
g_return_if_fail (G_IS_SETTINGS (settings));
if (G_IS_DELAYED_SETTINGS_BACKEND (settings->priv->backend))
return;
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 (delayed);
g_settings_backend_watch (settings->priv->backend,
&listener_vtable, G_OBJECT (settings),
settings->priv->main_context);
g_object_notify (G_OBJECT (settings), "delay-apply");
}
/**
* 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 (G_IS_DELAYED_SETTINGS_BACKEND (settings->priv->backend))
{
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 (G_IS_DELAYED_SETTINGS_BACKEND (settings->priv->backend))
{
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 whether the #GSettings object has any unapplied
* changes. This can only be the case if it is in 'delayed-apply' mode.
*
* Returns: %TRUE if @settings has unapplied changes
*
* Since: 2.26
*/
gboolean
g_settings_get_has_unapplied (GSettings *settings)
{
g_return_val_if_fail (G_IS_SETTINGS (settings), FALSE);
return G_IS_DELAYED_SETTINGS_BACKEND (settings->priv->backend) &&
g_delayed_settings_backend_get_has_unapplied (
G_DELAYED_SETTINGS_BACKEND (settings->priv->backend));
}
/* Extra API (reset, sync, get_child, is_writable, list_*, ranges) {{{1 */
/**
* g_settings_reset:
* @settings: a #GSettings object
* @key: the name of a key
*
* Resets @key to its default value.
*
* This call resets the key, as much as possible, to its default value.
* That might be the value specified in the schema or the one set by the
* administrator.
**/
void
g_settings_reset (GSettings *settings,
const gchar *key)
{
gchar *path;
g_return_if_fail (G_IS_SETTINGS (settings));
g_return_if_fail (key != NULL);
path = g_strconcat (settings->priv->path, key, NULL);
g_settings_backend_reset (settings->priv->backend, path, NULL);
g_free (path);
}
/**
* g_settings_sync:
*
* Ensures that all pending operations are complete for the default backend.
*
* 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
*
* Finds out if a key can be written or not
*
* Returns: %TRUE if the key @name is writable
*
* 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
*
* Creates a child settings object which has a base path of
* `base-path/@name`, where `base-path` is the base path of
* @settings.
*
* The schema for the child settings object must have been declared
* in the schema of @settings using a `` element.
*
* The created child settings object will inherit the #GSettings:delay-apply
* mode from @settings.
*
* Returns: (not nullable) (transfer full): a 'child' settings object
*
* Since: 2.26
*/
GSettings *
g_settings_get_child (GSettings *settings,
const gchar *name)
{
GSettingsSchema *child_schema;
gchar *child_path;
GSettings *child;
g_return_val_if_fail (G_IS_SETTINGS (settings), NULL);
child_schema = g_settings_schema_get_child_schema (settings->priv->schema,
name);
if (child_schema == NULL)
g_error ("Schema '%s' has no child '%s' or child schema not found",
g_settings_schema_get_id (settings->priv->schema), name);
child_path = g_strconcat (settings->priv->path, name, "/", NULL);
child = g_settings_new_full (child_schema,
settings->priv->backend,
child_path);
g_settings_schema_unref (child_schema);
g_free (child_path);
return child;
}
/**
* g_settings_list_keys:
* @settings: a #GSettings object
*
* Introspects the list of keys on @settings.
*
* 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_strfreev() when you are done
* with it.
*
* Returns: (not nullable) (transfer full) (element-type utf8): a list
* of the keys on @settings, in no defined order
* Deprecated: 2.46: Use g_settings_schema_list_keys() instead.
*/
gchar **
g_settings_list_keys (GSettings *settings)
{
return g_settings_schema_list_keys (settings->priv->schema);
}
/**
* g_settings_list_children:
* @settings: a #GSettings object
*
* Gets the list of children on @settings.
*
* The list is exactly the list of strings for which it is not an error
* to call g_settings_get_child().
*
* There is little reason to call this function from "normal" code, since
* you should already know what children are in your schema. This function
* may still be useful there for introspection reasons, however.
*
* You should free the return value with g_strfreev() when you are done
* with it.
*
* Returns: (not nullable) (transfer full) (element-type utf8): a list of the children
* on @settings, in no defined order
*/
gchar **
g_settings_list_children (GSettings *settings)
{
return g_settings_schema_list_children (settings->priv->schema);
}
/**
* g_settings_get_range:
* @settings: a #GSettings
* @key: the key to query the range of
*
* Queries the range of a key.
*
* Since: 2.28
*
* Deprecated:2.40:Use g_settings_schema_key_get_range() instead.
**/
GVariant *
g_settings_get_range (GSettings *settings,
const gchar *key)
{
GSettingsSchemaKey skey;
GVariant *range;
g_settings_schema_key_init (&skey, settings->priv->schema, key);
range = g_settings_schema_key_get_range (&skey);
g_settings_schema_key_clear (&skey);
return range;
}
/**
* g_settings_range_check:
* @settings: a #GSettings
* @key: the key to check
* @value: the value to check
*
* Checks if the given @value is of the correct type and within the
* permitted range for @key.
*
* Returns: %TRUE if @value is valid for @key
*
* Since: 2.28
*
* Deprecated:2.40:Use g_settings_schema_key_range_check() instead.
**/
gboolean
g_settings_range_check (GSettings *settings,
const gchar *key,
GVariant *value)
{
GSettingsSchemaKey skey;
gboolean good;
g_settings_schema_key_init (&skey, settings->priv->schema, key);
good = g_settings_schema_key_range_check (&skey, value);
g_settings_schema_key_clear (&skey);
return good;
}
/* Binding {{{1 */
typedef struct
{
GSettingsSchemaKey key;
GSettings *settings;
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->settings,
binding->writable_handler_id);
if (binding->key_handler_id)
g_signal_handler_disconnect (binding->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_schema_key_clear (&binding->key);
if (binding->destroy)
binding->destroy (binding->user_data);
g_object_unref (binding->settings);
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 = G_VALUE_INIT;
GVariant *variant;
g_assert (settings == binding->settings);
g_assert (key == binding->key.name);
if (binding->running)
return;
binding->running = TRUE;
g_value_init (&value, binding->property->value_type);
variant = g_settings_read_from_backend (binding->settings, &binding->key, FALSE, FALSE);
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_schema_key_get_translated_default (&binding->key);
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->key.unparsed, binding->key.name,
g_settings_schema_get_id (binding->key.schema));
g_variant_unref (variant);
variant = NULL;
}
}
if (variant == NULL)
{
variant = g_settings_schema_key_get_per_desktop_default (&binding->key);
if (variant &&
!binding->get_mapping (&value, variant, binding->user_data))
{
g_error ("Per-desktop default value for key '%s' in schema '%s' "
"was rejected by the binding mapping function.",
binding->key.name, g_settings_schema_get_id (binding->key.schema));
g_variant_unref (variant);
variant = NULL;
}
}
if (variant == NULL)
{
variant = g_variant_ref (binding->key.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->key.name, g_settings_schema_get_id (binding->key.schema));
}
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 = G_VALUE_INIT;
GVariant *variant;
gboolean valid = TRUE;
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->key.type,
binding->user_data)))
{
g_variant_take_ref (variant);
if (!g_settings_schema_key_type_check (&binding->key, variant))
{
gchar *type_str;
type_str = g_variant_type_dup_string (binding->key.type);
g_critical ("binding mapping function for key '%s' returned "
"GVariant of type '%s' when type '%s' was requested",
binding->key.name, g_variant_get_type_string (variant),
type_str);
g_free (type_str);
valid = FALSE;
}
if (valid && !g_settings_schema_key_range_check (&binding->key, variant))
{
gchar *variant_str;
variant_str = g_variant_print (variant, TRUE);
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->key.name, g_settings_schema_get_id (binding->key.schema),
variant_str);
g_free (variant_str);
valid = FALSE;
}
if (valid)
{
g_settings_write_to_backend (binding->settings, &binding->key, variant);
}
g_variant_unref (variant);
}
g_value_unset (&value);
binding->running = FALSE;
}
static gboolean
g_settings_bind_invert_boolean_get_mapping (GValue *value,
GVariant *variant,
gpointer user_data)
{
g_value_set_boolean (value, !g_variant_get_boolean (variant));
return TRUE;
}
static GVariant *
g_settings_bind_invert_boolean_set_mapping (const GValue *value,
const GVariantType *expected_type,
gpointer user_data)
{
return g_variant_new_boolean (!g_value_get_boolean (value));
}
/**
* g_settings_bind:
* @settings: a #GSettings object
* @key: the key to bind
* @object: (type GObject.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 @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)
{
GSettingsBindGetMapping get_mapping = NULL;
GSettingsBindSetMapping set_mapping = NULL;
if (flags & G_SETTINGS_BIND_INVERT_BOOLEAN)
{
get_mapping = g_settings_bind_invert_boolean_get_mapping;
set_mapping = g_settings_bind_invert_boolean_set_mapping;
/* can't pass this flag to g_settings_bind_with_mapping() */
flags &= ~G_SETTINGS_BIND_INVERT_BOOLEAN;
}
g_settings_bind_with_mapping (settings, key, object, property, flags,
get_mapping, set_mapping, NULL, NULL);
}
/**
* g_settings_bind_with_mapping: (skip)
* @settings: a #GSettings object
* @key: the key to bind
* @object: (type GObject.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 @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));
g_return_if_fail (key != NULL);
g_return_if_fail (G_IS_OBJECT (object));
g_return_if_fail (property != NULL);
g_return_if_fail (~flags & G_SETTINGS_BIND_INVERT_BOOLEAN);
objectclass = G_OBJECT_GET_CLASS (object);
binding = g_slice_new0 (GSettingsBinding);
g_settings_schema_key_init (&binding->key, settings->priv->schema, key);
binding->settings = g_object_ref (settings);
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", binding->property->name, 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", binding->property->name, G_OBJECT_TYPE_NAME (object));
return;
}
if (get_mapping == g_settings_bind_invert_boolean_get_mapping)
{
/* g_settings_bind_invert_boolean_get_mapping() is a private
* function, so if we are here it means that g_settings_bind() was
* called with G_SETTINGS_BIND_INVERT_BOOLEAN.
*
* Ensure that both sides are boolean.
*/
if (binding->property->value_type != G_TYPE_BOOLEAN)
{
g_critical ("g_settings_bind: G_SETTINGS_BIND_INVERT_BOOLEAN "
"was specified, but property '%s' on type '%s' has "
"type '%s'", binding->property->name, G_OBJECT_TYPE_NAME (object),
g_type_name ((binding->property->value_type)));
return;
}
if (!g_variant_type_equal (binding->key.type, G_VARIANT_TYPE_BOOLEAN))
{
gchar *type_string = g_variant_type_dup_string (binding->key.type);
g_critical ("g_settings_bind: G_SETTINGS_BIND_INVERT_BOOLEAN "
"was specified, but key '%s' on schema '%s' has "
"type '%s'", key, g_settings_schema_get_id (settings->priv->schema),
type_string);
g_free (type_string);
return;
}
}
else 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->key.type))
{
gchar *type_string = g_variant_type_dup_string (binding->key.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'", binding->property->name, G_OBJECT_TYPE_NAME (object),
g_type_name (binding->property->value_type),
type_string, key,
g_settings_schema_get_id (settings->priv->schema));
g_free (type_string);
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->key.name, object, "sensitive", FALSE);
}
if (flags & G_SETTINGS_BIND_SET)
{
detailed_signal = g_strdup_printf ("notify::%s", binding->property->name);
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->key.name, binding);
}
binding_quark = g_settings_binding_quark (binding->property->name);
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: (type GObject.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 not writable.
*
* Note that the lifecycle of the binding is tied to @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: (type GObject.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);
}
/* GAction {{{1 */
typedef struct
{
GObject parent_instance;
GSettingsSchemaKey key;
GSettings *settings;
} GSettingsAction;
typedef GObjectClass GSettingsActionClass;
static GType g_settings_action_get_type (void);
static void g_settings_action_iface_init (GActionInterface *iface);
G_DEFINE_TYPE_WITH_CODE (GSettingsAction, g_settings_action, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (G_TYPE_ACTION, g_settings_action_iface_init))
enum
{
ACTION_PROP_0,
ACTION_PROP_NAME,
ACTION_PROP_PARAMETER_TYPE,
ACTION_PROP_ENABLED,
ACTION_PROP_STATE_TYPE,
ACTION_PROP_STATE
};
static const gchar *
g_settings_action_get_name (GAction *action)
{
GSettingsAction *gsa = (GSettingsAction *) action;
return gsa->key.name;
}
static const GVariantType *
g_settings_action_get_parameter_type (GAction *action)
{
GSettingsAction *gsa = (GSettingsAction *) action;
const GVariantType *type;
type = g_variant_get_type (gsa->key.default_value);
if (g_variant_type_equal (type, G_VARIANT_TYPE_BOOLEAN))
type = NULL;
return type;
}
static gboolean
g_settings_action_get_enabled (GAction *action)
{
GSettingsAction *gsa = (GSettingsAction *) action;
return g_settings_is_writable (gsa->settings, gsa->key.name);
}
static const GVariantType *
g_settings_action_get_state_type (GAction *action)
{
GSettingsAction *gsa = (GSettingsAction *) action;
return g_variant_get_type (gsa->key.default_value);
}
static GVariant *
g_settings_action_get_state (GAction *action)
{
GSettingsAction *gsa = (GSettingsAction *) action;
GVariant *value;
value = g_settings_read_from_backend (gsa->settings, &gsa->key, FALSE, FALSE);
if (value == NULL)
value = g_settings_schema_key_get_default_value (&gsa->key);
return value;
}
static GVariant *
g_settings_action_get_state_hint (GAction *action)
{
GSettingsAction *gsa = (GSettingsAction *) action;
/* no point in reimplementing this... */
return g_settings_schema_key_get_range (&gsa->key);
}
static void
g_settings_action_change_state (GAction *action,
GVariant *value)
{
GSettingsAction *gsa = (GSettingsAction *) action;
if (g_settings_schema_key_type_check (&gsa->key, value) && g_settings_schema_key_range_check (&gsa->key, value))
g_settings_write_to_backend (gsa->settings, &gsa->key, value);
}
static void
g_settings_action_activate (GAction *action,
GVariant *parameter)
{
GSettingsAction *gsa = (GSettingsAction *) action;
if (g_variant_is_of_type (gsa->key.default_value, G_VARIANT_TYPE_BOOLEAN))
{
GVariant *old;
if (parameter != NULL)
return;
old = g_settings_action_get_state (action);
parameter = g_variant_new_boolean (!g_variant_get_boolean (old));
g_variant_unref (old);
}
g_action_change_state (action, parameter);
}
static void
g_settings_action_get_property (GObject *object, guint prop_id,
GValue *value, GParamSpec *pspec)
{
GAction *action = G_ACTION (object);
switch (prop_id)
{
case ACTION_PROP_NAME:
g_value_set_string (value, g_settings_action_get_name (action));
break;
case ACTION_PROP_PARAMETER_TYPE:
g_value_set_boxed (value, g_settings_action_get_parameter_type (action));
break;
case ACTION_PROP_ENABLED:
g_value_set_boolean (value, g_settings_action_get_enabled (action));
break;
case ACTION_PROP_STATE_TYPE:
g_value_set_boxed (value, g_settings_action_get_state_type (action));
break;
case ACTION_PROP_STATE:
g_value_take_variant (value, g_settings_action_get_state (action));
break;
default:
g_assert_not_reached ();
}
}
static void
g_settings_action_finalize (GObject *object)
{
GSettingsAction *gsa = (GSettingsAction *) object;
g_signal_handlers_disconnect_by_data (gsa->settings, gsa);
g_object_unref (gsa->settings);
g_settings_schema_key_clear (&gsa->key);
G_OBJECT_CLASS (g_settings_action_parent_class)
->finalize (object);
}
static void
g_settings_action_init (GSettingsAction *gsa)
{
}
static void
g_settings_action_iface_init (GActionInterface *iface)
{
iface->get_name = g_settings_action_get_name;
iface->get_parameter_type = g_settings_action_get_parameter_type;
iface->get_enabled = g_settings_action_get_enabled;
iface->get_state_type = g_settings_action_get_state_type;
iface->get_state = g_settings_action_get_state;
iface->get_state_hint = g_settings_action_get_state_hint;
iface->change_state = g_settings_action_change_state;
iface->activate = g_settings_action_activate;
}
static void
g_settings_action_class_init (GSettingsActionClass *class)
{
class->get_property = g_settings_action_get_property;
class->finalize = g_settings_action_finalize;
g_object_class_override_property (class, ACTION_PROP_NAME, "name");
g_object_class_override_property (class, ACTION_PROP_PARAMETER_TYPE, "parameter-type");
g_object_class_override_property (class, ACTION_PROP_ENABLED, "enabled");
g_object_class_override_property (class, ACTION_PROP_STATE_TYPE, "state-type");
g_object_class_override_property (class, ACTION_PROP_STATE, "state");
}
static void
g_settings_action_changed (GSettings *settings,
const gchar *key,
gpointer user_data)
{
g_object_notify (user_data, "state");
}
static void
g_settings_action_enabled_changed (GSettings *settings,
const gchar *key,
gpointer user_data)
{
g_object_notify (user_data, "enabled");
}
/**
* g_settings_create_action:
* @settings: a #GSettings
* @key: the name of a key in @settings
*
* Creates a #GAction corresponding to a given #GSettings key.
*
* The action has the same name as the key.
*
* The value of the key becomes the state of the action and the action
* is enabled when the key is writable. Changing the state of the
* action results in the key being written to. Changes to the value or
* writability of the key cause appropriate change notifications to be
* emitted for the action.
*
* For boolean-valued keys, action activations take no parameter and
* result in the toggling of the value. For all other types,
* activations take the new value for the key (which must have the
* correct type).
*
* Returns: (not nullable) (transfer full): a new #GAction
*
* Since: 2.32
**/
GAction *
g_settings_create_action (GSettings *settings,
const gchar *key)
{
GSettingsAction *gsa;
gchar *detailed_signal;
g_return_val_if_fail (G_IS_SETTINGS (settings), NULL);
g_return_val_if_fail (key != NULL, NULL);
gsa = g_object_new (g_settings_action_get_type (), NULL);
gsa->settings = g_object_ref (settings);
g_settings_schema_key_init (&gsa->key, settings->priv->schema, key);
detailed_signal = g_strdup_printf ("changed::%s", key);
g_signal_connect (settings, detailed_signal, G_CALLBACK (g_settings_action_changed), gsa);
g_free (detailed_signal);
detailed_signal = g_strdup_printf ("writable-changed::%s", key);
g_signal_connect (settings, detailed_signal, G_CALLBACK (g_settings_action_enabled_changed), gsa);
g_free (detailed_signal);
return G_ACTION (gsa);
}
/* Epilogue {{{1 */
/* vim:set foldmethod=marker: */