Settings

The gio.Settings class provides a convenient API for storing and retrieving application settings.

Reads and writes can be considered to be non-blocking. Reading settings with gio.Settings is typically extremely fast: on approximately the same order of magnitude (but slower than) a 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 gio.Settings 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 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 glib.Variant, and allows any 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 <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|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: |[ <!-- Translators: A list of words which are not allowed to be typed, in GVariant serialization syntax. See: https://developer.gnome.org/glib/stable/gvariant-text.html --> <default l10n='messages' context='Banned words'>['bad', 'words']</default>

Translations of default values must remain syntactically valid serialized
[glib.Variant.Variant|glib.Variants] (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](https://git.gnome.org/browse/glib/tree/gio/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 [glib.Variant.Variant|glib.Variant] 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 [gio.Settings.Settings.getEnum|Settings.getEnum], [gio.Settings.Settings.setEnum|Settings.setEnum],
[gio.Settings.Settings.getFlags|Settings.getFlags], [gio.Settings.Settings.setFlags|Settings.setFlags] 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="box" type="(ii)">
<default>(20,30)</default>
</key>

</schema>
</schemalist>

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

<enum id="org.gtk.Test.myenum"> <value nick="first" value="1"/> <value nick="second" value="2"/> </enum>

<flags id="org.gtk.Test.myflags"> <value nick="flag1" value="1"/> <value nick="flag2" value="2"/> <value nick="flag3" value="4"/> </flags>

<schema id="org.gtk.Test">

<key name="key-with-range" type="i"> <range min="1" max="100"/> <default>10</default> </key>

<key name="key-with-choices" type="s"> <choices> <choice value='Elisabeth'/> <choice value='Annabeth'/> <choice value='Joe'/> </choices> <aliases> <alias value='Anna' target='Annabeth'/> <alias value='Beth' target='Elisabeth'/> </aliases> <default>'Joe'</default> </key>

<key name='enumerated-key' enum='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 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|gsettings-relocatable]}

A relocatable schema is one with no path attribute specified on its <schema> element. By using Settings.newWithPath, a gio.Settings object can be instantiated for a relocatable schema, assigning a path to the instance. Paths passed to Settings.newWithPath 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-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 {}

Constructors

this
this(GSettings* gSettings, bool ownedRef = false)

Sets our main struct and passes it to the parent class.

this
this(string schemaId)

Creates a new gio.Settings object with the schema specified by schema_id.

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

Creates a new gio.Settings object with a given schema, backend and path.

this
this(string schemaId, SettingsBackend backend)

Creates a new gio.Settings object with the schema specified by schema_id and a given gio.SettingsBackend

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

Creates a new gio.Settings object with the schema specified by schema_id and a given gio.SettingsBackend and path.

this
this(string schemaId, string path)

Creates a new gio.Settings 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 = cast(ConnectFlags)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.

addOnChanged
gulong addOnChanged(void delegate(string, Settings) dlg, ConnectFlags connectFlags = cast(ConnectFlags)0)

The "changed" signal is emitted when a key has potentially changed. You should call one of the Settings.get calls to check the new value.

addOnWritableChange
gulong addOnWritableChange(bool delegate(uint, Settings) dlg, ConnectFlags connectFlags = cast(ConnectFlags)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.

addOnWritableChanged
gulong addOnWritableChanged(void delegate(string, Settings) dlg, ConnectFlags connectFlags = cast(ConnectFlags)0)

The "writable-changed" signal is emitted when the writability of a key has potentially changed. You should call Settings.isWritable 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 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 gtk.Action corresponding to a given gio.Settings key.

delay
void delay()

Changes the gio.Settings object into 'delay-apply' mode. In this mode, changes to settings are not immediately propagated to the backend, but kept locally until 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 gio.Settings 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 = false)

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 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 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

getObjectGStruct
GObject* getObjectGStruct(bool transferOwnership = false)

Get the main Gtk struct

getStruct
void* getStruct()

the main Gtk struct as a void*

opCast
T opCast()
getDObject
RT getDObject(U obj, bool ownedRef = false)

Gets a D Object from the objects table of associations.

setProperty
void setProperty(string propertyName, T value)
addOnNotify
gulong addOnNotify(void delegate(ParamSpec, ObjectG) dlg, string property = "", ConnectFlags connectFlags = cast(ConnectFlags)0)

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 gobject.ParamSpec 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 gobject.ParamSpec, but normally ObjectClass.overrideProperty 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(ref 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 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. value must have been initialized to the expected type of the property (or a type to which the expected type can be transformed) using Value.init.

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
ObjectG doref()

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(ref 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, out 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, out 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 (retrived 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:

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 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 finalized. 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(ref ObjectG objectPtr)

Clears a reference to a GObject

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