Settings

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 #GHashTable 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 g_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[gsettings-relocatable]', i.e. not equipped with a fixed path. This is useful e.g. when the schema describes an 'account', and you want to be able to store a arbitrary number of accounts.

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 #GVariant, and allows any #GVariantType for keys. Key names are restricted to lowercase characters, numbers and '-'. Furthermore, the names must begin with a lowercase character, must not end with a '-', and must not contain consecutive dashes.

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 <schemalist> or <schema> elements and the category that is specified in the l10n attribute of the <default> element. The string which is translated includes all text in the <default> 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 <default> 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 <default> element to disambiguate multiple defaults which use the same string.

For example: |[  <default l10n='messages' context='Banned words'>['bad', 'words']</default> ]|

Translations of default values must remain syntactically valid serialized #GVariants (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] utility. The input is a schema description in an XML format.

A DTD for the gschema XML format can be found here: gschema.dtd

The [glib-compile-schemas][glib-compile-schemas] 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 <schema> 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 #GVariant types, keys can have types that have enumerated types. These can be described by a <choice>, <enum> or <flags> element, as seen in the example[schema-enumerated]. The underlying type of such a key is string, but you can use g_settings_get_enum(), g_settings_set_enum(), g_settings_get_flags(), g_settings_set_flags() access the numeric values corresponding to the string value of enum and flags keys.

An example for default value: |[ <schemalist> <schema id="org.gtk.Test" path="/org/gtk/Test/" gettext-domain="test">

<key name="greeting" type="s"> <default l10n="messages">"Hello, earthlings"</default> <summary>A greeting</summary> <description> Greeting of the invading martians </description> </key>

<key name="empty-string" type="s"> <default>""</default> <summary>Empty strings have to be provided in GVariant form</summary> </key>

</schema> </schemalist> ]|

An example for ranges, choices and enumerated types: |[ <schemalist>

<key name='enumerated-key' enum='org.gtk.Test.myenum'> <default>'first'</default> </key>

<key name='flags-key' flags='org.gtk.Test.myflags'> <default>["flag1","flag2"]</default> </key> </schema> </schemalist> ]|

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] 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 GVariant 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 #GObject properties directly to settings, using g_settings_bind(). Once a GObject property has been bound to a setting, changes on either side are automatically propagated to the other side. GSettings handles details like mapping between GObject and GVariant types, and preventing infinite cycles.

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 # {#gsettings-relocatable}

A relocatable schema is one with no path attribute specified on its <schema> element. By using g_settings_new_with_path(), a #GSettings object can be instantiated for a relocatable schema, assigning a path to the instance. Paths passed to g_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 <child> elements in the parent schema, e.g.: |[ <schema id="org.foo.MyApp" path="/org/foo/MyApp/"> <child name="main" schema="org.foo.MyApp.Window"/> </schema> ]|

Build system integration # {#gsettings-build-system}

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 <summary> and <description> elements, and also any <default> 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 <enum> 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.

class Settings : ObjectG {

protected

GSettings* gSettings;

GSettings* getSettingsStruct(bool transferOwnership);

void* getStruct();

this(GSettings* gSettings, bool ownedRef);

static GType getType();

this(string schemaId);

this(SettingsSchema schema, SettingsBackend backend, string path);

this(string schemaId, SettingsBackend backend);

this(string schemaId, SettingsBackend backend, string path);

this(string schemaId, string path);

static string[] listRelocatableSchemas();

static string[] listSchemas();

static void sync();

static void unbind(ObjectG object, string property);

void apply();

void bind(string key, ObjectG object, string property, GSettingsBindFlags flags);

void bindWithMapping(string key, ObjectG object, string property, GSettingsBindFlags flags, GSettingsBindGetMapping getMapping, GSettingsBindSetMapping setMapping, void* userData, GDestroyNotify destroy);

void bindWritable(string key, ObjectG object, string property, bool inverted);

ActionIF createAction(string key);

void delay();

bool getBoolean(string key);

Settings getChild(string name);

Variant getDefaultValue(string key);

double getDouble(string key);

int getEnum(string key);

uint getFlags(string key);

bool getHasUnapplied();

int getInt(string key);

long getInt64(string key);

void* getMapped(string key, GSettingsGetMapping mapping, void* userData);

Variant getRange(string key);

string getString(string key);

string[] getStrv(string key);

uint getUint(string key);

ulong getUint64(string key);

Variant getUserValue(string key);

Variant getValue(string key);

bool isWritable(string name);

string[] listChildren();

string[] listKeys();

bool rangeCheck(string key, Variant value);

void reset(string key);

void revert();

bool setBoolean(string key, bool value);

bool setDouble(string key, double value);

bool setEnum(string key, int value);

bool setFlags(string key, uint value);

bool setInt(string key, int value);

bool setInt64(string key, long value);

bool setString(string key, string value);

bool setStrv(string key, string[] value);

bool setUint(string key, uint value);

bool setUint64(string key, ulong value);

bool setValue(string key, Variant value);

gulong addOnChange(bool delegate(void*, int, Settings) dlg, ConnectFlags connectFlags);

gulong addOnChanged(void delegate(string, Settings) dlg, ConnectFlags connectFlags);

gulong addOnWritableChange(bool delegate(uint, Settings) dlg, ConnectFlags connectFlags);

gulong addOnWritableChanged(void delegate(string, Settings) dlg, ConnectFlags connectFlags);

}

Constructors

this this(GSettings* gSettings, bool ownedRef): Sets our main struct and passes it to the parent class.
this this(string schemaId): Creates a new #GSettings object with the schema specified by @schema_id.
this this(SettingsSchema schema, SettingsBackend backend, string path): Creates a new #GSettings object with a given schema, backend and path.
this this(string schemaId, SettingsBackend backend): Creates a new #GSettings object with the schema specified by @schema_id and a given #GSettingsBackend.
this this(string schemaId, SettingsBackend backend, string path): Creates a new #GSettings object with the schema specified by @schema_id and a given #GSettingsBackend and path.
this this(string schemaId, string path): Creates a new #GSettings object with the relocatable schema specified by @schema_id and a given path.

Members

Functions

addOnChange gulong addOnChange(bool delegate(void*, int, Settings) dlg, ConnectFlags connectFlags): 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.
addOnChanged gulong addOnChanged(void delegate(string, Settings) dlg, ConnectFlags connectFlags): 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.
addOnWritableChange gulong addOnWritableChange(bool delegate(uint, Settings) dlg, ConnectFlags connectFlags): 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.
addOnWritableChanged gulong addOnWritableChanged(void delegate(string, Settings) dlg, ConnectFlags connectFlags): 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.
apply void apply(): 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.
bind void bind(string key, ObjectG object, string property, GSettingsBindFlags flags): Create a binding between the @key in the @settings object and the property @property of @object.
bindWithMapping void bindWithMapping(string key, ObjectG object, string property, GSettingsBindFlags flags, GSettingsBindGetMapping getMapping, GSettingsBindSetMapping setMapping, void* userData, GDestroyNotify destroy): Create a binding between the @key in the @settings object and the property @property of @object.
bindWritable void bindWritable(string key, ObjectG object, string property, bool inverted): 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.
createAction ActionIF createAction(string key): Creates a #GAction corresponding to a given #GSettings key.
delay void delay(): 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.
getBoolean bool getBoolean(string key): Gets the value that is stored at @key in @settings.
getChild Settings getChild(string name): Creates a child settings object which has a base path of base-path/@name, where base-path is the base path of @settings.
getDefaultValue Variant getDefaultValue(string key): Gets the "default value" of a key.
getDouble double getDouble(string key): Gets the value that is stored at @key in @settings.
getEnum int getEnum(string key): Gets the value that is stored in @settings for @key and converts it to the enum value that it represents.
getFlags uint getFlags(string key): Gets the value that is stored in @settings for @key and converts it to the flags value that it represents.
getHasUnapplied bool getHasUnapplied(): Returns whether the #GSettings object has any unapplied changes. This can only be the case if it is in 'delayed-apply' mode.
getInt int getInt(string key): Gets the value that is stored at @key in @settings.
getInt64 long getInt64(string key): Gets the value that is stored at @key in @settings.
getMapped void* getMapped(string key, GSettingsGetMapping mapping, void* userData): Gets the value that is stored at @key in @settings, subject to application-level validation/mapping.
getRange Variant getRange(string key): Queries the range of a key.
getSettingsStruct GSettings* getSettingsStruct(bool transferOwnership): Get the main Gtk struct
getString string getString(string key): Gets the value that is stored at @key in @settings.
getStruct void* getStruct(): the main Gtk struct as a void*
getStrv string[] getStrv(string key): A convenience variant of g_settings_get() for string arrays.
getUint uint getUint(string key): Gets the value that is stored at @key in @settings.
getUint64 ulong getUint64(string key): Gets the value that is stored at @key in @settings.
getUserValue Variant getUserValue(string key): Checks the "user value" of a key, if there is one.
getValue Variant getValue(string key): Gets the value that is stored in @settings for @key.
isWritable bool isWritable(string name): Finds out if a key can be written or not
listChildren string[] listChildren(): Gets the list of children on @settings.
listKeys string[] listKeys(): Introspects the list of keys on @settings.
rangeCheck bool rangeCheck(string key, Variant value): Checks if the given @value is of the correct type and within the permitted range for @key.
reset void reset(string key): Resets @key to its default value.
revert void revert(): 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.
setBoolean bool setBoolean(string key, bool value): Sets @key in @settings to @value.
setDouble bool setDouble(string key, double value): Sets @key in @settings to @value.
setEnum bool setEnum(string key, int value): Looks up the enumerated type nick for @value and writes it to @key, within @settings.
setFlags bool setFlags(string key, uint 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.
setInt bool setInt(string key, int value): Sets @key in @settings to @value.
setInt64 bool setInt64(string key, long value): Sets @key in @settings to @value.
setString bool setString(string key, string value): Sets @key in @settings to @value.
setStrv bool setStrv(string key, string[] value): Sets @key in @settings to @value.
setUint bool setUint(string key, uint value): Sets @key in @settings to @value.
setUint64 bool setUint64(string key, ulong value): Sets @key in @settings to @value.
setValue bool setValue(string key, Variant value): Sets @key in @settings to @value.

Static functions

getType GType getType()
listRelocatableSchemas string[] listRelocatableSchemas(): Deprecated.
listSchemas string[] listSchemas(): Deprecated.
sync void sync(): Ensures that all pending operations are complete for the default backend.
unbind void unbind(ObjectG object, string property): Removes an existing binding for @property on @object.

Variables

gSettings GSettings* gSettings;: the main Gtk struct

Inherited Members

From ObjectG

gObject GObject* gObject;: the main Gtk struct
ownedRef bool ownedRef;: Undocumented in source.
getObjectGStruct GObject* getObjectGStruct(bool transferOwnership): Get the main Gtk struct
getStruct void* getStruct(): the main Gtk struct as a void*
isGcRoot bool isGcRoot;: Undocumented in source.
signals DClosure[gulong] signals;: Undocumented in source.
destroyNotify void destroyNotify(ObjectG obj): Undocumented in source. Be warned that the author may not have intended to support it.
toggleNotify void toggleNotify(ObjectG obj, GObject* object, int isLastRef): Undocumented in source. Be warned that the author may not have intended to support it.
~this ~this(): Undocumented in source.
opCast T opCast()
getDObject RT getDObject(U obj, bool ownedRef): Gets a D Object from the objects table of associations.
removeGcRoot void removeGcRoot(): Undocumented in source. Be warned that the author may not have intended to support it.
setProperty void setProperty(string propertyName, T value)
unref deprecated void unref(ObjectG obj): Undocumented in source. Be warned that the author may not have intended to support it.
doref deprecated ObjectG doref(ObjectG obj): Undocumented in source. Be warned that the author may not have intended to support it.
addOnNotify gulong addOnNotify(void delegate(ParamSpec, ObjectG) dlg, string property, ConnectFlags connectFlags): The notify signal is emitted on an object when one of its properties has been changed. Note that getting this signal doesn't guarantee that the value of the property has actually changed, it may also be emitted when the setter for the property is called to reinstate the previous value.
getType GType getType()
compatControl size_t compatControl(size_t what, void* data)
interfaceFindProperty ParamSpec interfaceFindProperty(TypeInterface gIface, string propertyName): Find the #GParamSpec with the given name for an interface. Generally, the interface vtable passed in as @g_iface will be the default vtable from g_type_default_interface_ref(), or, if you know the interface has already been loaded, g_type_default_interface_peek().
interfaceInstallProperty void interfaceInstallProperty(TypeInterface gIface, ParamSpec pspec): Add a property to an interface; this is only useful for interfaces that are added to GObject-derived types. Adding a property to an interface forces all objects classes with that interface to have a compatible property. The compatible property could be a newly created #GParamSpec, but normally g_object_class_override_property() will be used so that the object class only needs to provide an implementation and inherits the property description, default value, bounds, and so forth from the interface property.
interfaceListProperties ParamSpec[] interfaceListProperties(TypeInterface gIface): Lists the properties of an interface.Generally, the interface vtable passed in as @g_iface will be the default vtable from g_type_default_interface_ref(), or, if you know the interface has already been loaded, g_type_default_interface_peek().
addToggleRef void addToggleRef(GToggleNotify notify, void* data): Increases the reference count of the object by one and sets a callback to be called when all other references to the object are dropped, or when this is already the last reference to the object and another reference is established.
addWeakPointer void addWeakPointer(void* weakPointerLocation): Adds a weak reference from weak_pointer to @object to indicate that the pointer located at @weak_pointer_location is only valid during the lifetime of @object. When the @object is finalized, @weak_pointer will be set to %NULL.
bindProperty Binding bindProperty(string sourceProperty, ObjectG target, string targetProperty, GBindingFlags flags): Creates a binding between @source_property on @source and @target_property on @target. Whenever the @source_property is changed the @target_property is updated using the same value. For instance:
bindPropertyFull Binding bindPropertyFull(string sourceProperty, ObjectG target, string targetProperty, GBindingFlags flags, GBindingTransformFunc transformTo, GBindingTransformFunc transformFrom, void* userData, GDestroyNotify notify): Complete version of g_object_bind_property().
bindPropertyWithClosures Binding bindPropertyWithClosures(string sourceProperty, ObjectG target, string targetProperty, GBindingFlags flags, Closure transformTo, Closure transformFrom): Creates a binding between @source_property on @source and @target_property on @target, allowing you to set the transformation functions to be used by the binding.
dupData void* dupData(string key, GDuplicateFunc dupFunc, void* userData): This is a variant of g_object_get_data() which returns a 'duplicate' of the value. @dup_func defines the meaning of 'duplicate' in this context, it could e.g. take a reference on a ref-counted object.
dupQdata void* dupQdata(GQuark quark, GDuplicateFunc dupFunc, void* userData): This is a variant of g_object_get_qdata() which returns a 'duplicate' of the value. @dup_func defines the meaning of 'duplicate' in this context, it could e.g. take a reference on a ref-counted object.
forceFloating void forceFloating(): This function is intended for #GObject implementations to re-enforce a floating[floating-ref] object reference. Doing this is seldom required: all #GInitiallyUnowneds are created with a floating reference which usually just needs to be sunken by calling g_object_ref_sink().
freezeNotify void freezeNotify(): Increases the freeze count on @object. If the freeze count is non-zero, the emission of "notify" signals on @object is stopped. The signals are queued until the freeze count is decreased to zero. Duplicate notifications are squashed so that at most one #GObject::notify signal is emitted for each property modified while the object is frozen.
getData void* getData(string key): Gets a named field from the objects table of associations (see g_object_set_data()).
getProperty void getProperty(string propertyName, Value value): Gets a property of an object.
getQdata void* getQdata(GQuark quark): This function gets back user data pointers stored via g_object_set_qdata().
getValist void getValist(string firstPropertyName, void* varArgs): Gets properties of an object.
getv void getv(string[] names, Value[] values): Gets @n_properties properties for an @object. Obtained properties will be set to @values. All properties must be valid. Warnings will be emitted and undefined behaviour may result if invalid properties are passed in.
isFloating bool isFloating(): Checks whether @object has a floating[floating-ref] reference.
notify void notify(string propertyName): Emits a "notify" signal for the property @property_name on @object.
notifyByPspec void notifyByPspec(ParamSpec pspec): Emits a "notify" signal for the property specified by @pspec on @object.
doref alias doref = ref_: Undocumented in source.
ref_ ObjectG ref_(): Increases the reference count of @object.
refSink ObjectG refSink(): Increase the reference count of @object, and possibly remove the floating[floating-ref] reference, if @object has a floating reference.
removeToggleRef void removeToggleRef(GToggleNotify notify, void* data): Removes a reference added with g_object_add_toggle_ref(). The reference count of the object is decreased by one.
removeWeakPointer void removeWeakPointer(void* weakPointerLocation): Removes a weak reference from @object that was previously added using g_object_add_weak_pointer(). The @weak_pointer_location has to match the one used with g_object_add_weak_pointer().
replaceData bool replaceData(string key, void* oldval, void* newval, GDestroyNotify destroy, GDestroyNotify oldDestroy): Compares the user data for the key @key on @object with @oldval, and if they are the same, replaces @oldval with @newval.
replaceQdata bool replaceQdata(GQuark quark, void* oldval, void* newval, GDestroyNotify destroy, GDestroyNotify oldDestroy): Compares the user data for the key @quark on @object with @oldval, and if they are the same, replaces @oldval with @newval.
runDispose void runDispose(): Releases all references to other objects. This can be used to break reference cycles.
setData void setData(string key, void* data): Each object carries around a table of associations from strings to pointers. This function lets you set an association.
setDataFull void setDataFull(string key, void* data, GDestroyNotify destroy): Like g_object_set_data() except it adds notification for when the association is destroyed, either by setting it to a different value or when the object is destroyed.
setProperty void setProperty(string propertyName, Value value): Sets a property on an object.
setQdata void setQdata(GQuark quark, void* data): This sets an opaque, named pointer on an object. The name is specified through a #GQuark (retrieved e.g. via g_quark_from_static_string()), and the pointer can be gotten back from the @object with g_object_get_qdata() until the @object is finalized. Setting a previously set user data pointer, overrides (frees) the old pointer set, using #NULL as pointer essentially removes the data stored.
setQdataFull void setQdataFull(GQuark quark, void* data, GDestroyNotify destroy): This function works like g_object_set_qdata(), but in addition, a void (*destroy) (gpointer) function may be specified which is called with @data as argument when the @object is finalized, or the data is being overwritten by a call to g_object_set_qdata() with the same @quark.
setValist void setValist(string firstPropertyName, void* varArgs): Sets properties on an object.
setv void setv(string[] names, Value[] values): Sets @n_properties properties for an @object. Properties to be set will be taken from @values. All properties must be valid. Warnings will be emitted and undefined behaviour may result if invalid properties are passed in.
stealData void* stealData(string key): Remove a specified datum from the object's data associations, without invoking the association's destroy handler.
stealQdata void* stealQdata(GQuark quark): This function gets back user data pointers stored via g_object_set_qdata() and removes the @data from object without invoking its destroy() function (if any was set). Usually, calling this function is only required to update user data pointers with a destroy notifier, for example: |[ void object_add_to_user_list (GObject *object, const gchar *new_string) { // the quark, naming the object data GQuark quark_string_list = g_quark_from_static_string ("my-string-list"); // retrieve the old string list GList *list = g_object_steal_qdata (object, quark_string_list);
thawNotify void thawNotify(): Reverts the effect of a previous call to g_object_freeze_notify(). The freeze count is decreased on @object and when it reaches zero, queued "notify" signals are emitted.
unref void unref(): Decreases the reference count of @object. When its reference count drops to 0, the object is finalized (i.e. its memory is freed).
watchClosure void watchClosure(Closure closure): This function essentially limits the life time of the @closure to the life time of the object. That is, when the object is finalized, the @closure is invalidated by calling g_closure_invalidate() on it, in order to prevent invocations of the closure with a finalized (nonexisting) object. Also, g_object_ref() and g_object_unref() are added as marshal guards to the @closure, to ensure that an extra reference count is held on @object during invocation of the @closure. Usually, this function will be called on closures that use this @object as closure data.
weakRef void weakRef(GWeakNotify notify, void* data): Adds a weak reference callback to an object. Weak references are used for notification when an object is disposed. They are called "weak references" because they allow you to safely hold a pointer to an object without calling g_object_ref() (g_object_ref() adds a strong reference, that is, forces the object to stay alive).
weakUnref void weakUnref(GWeakNotify notify, void* data): Removes a weak reference callback to an object.
clearObject void clearObject(ObjectG objectPtr): Clears a reference to a #GObject.