Struct gio::PropertyAction

pub struct PropertyAction { /* private fields */ }

A GPropertyAction is a way to get a Action with a state value reflecting and controlling the value of a glib::Object property.

The state of the action will correspond to the value of the property. Changing it will change the property (assuming the requested value matches the requirements as specified in the [type@GObject.ParamSpec]).

Only the most common types are presently supported. Booleans are mapped to booleans, strings to strings, signed/unsigned integers to int32/uint32 and floats and doubles to doubles.

If the property is an enum then the state will be string-typed and conversion will automatically be performed between the enum value and ‘nick’ string as per the [type@GObject.EnumValue] table.

Flags types are not currently supported.

Properties of object types, boxed types and pointer types are not supported and probably never will be.

Properties of [type@GLib.Variant] types are not currently supported.

If the property is boolean-valued then the action will have a NULL parameter type, and activating the action (with no parameter) will toggle the value of the property.

In all other cases, the parameter type will correspond to the type of the property.

The general idea here is to reduce the number of locations where a particular piece of state is kept (and therefore has to be synchronised between). GPropertyAction does not have a separate state that is kept in sync with the property value — its state is the property value.

For example, it might be useful to create a Action corresponding to the visible-child-name property of a GtkStack so that the current page can be switched from a menu. The active radio indication in the menu is then directly determined from the active page of the GtkStack.

An anti-example would be binding the active-id property on a GtkComboBox. This is because the state of the combo box itself is probably uninteresting and is actually being used to control something else.

Another anti-example would be to bind to the visible-child-name property of a GtkStack if this value is actually stored in Settings. In that case, the real source of the value is* Settings. If you want a Action to control a setting stored in Settings, see SettingsExt::create_action() instead, and possibly combine its use with SettingsExtManual::bind().

Properties

enabled

If @action is currently enabled.

If the action is disabled then calls to g_action_activate() and g_action_change_state() have no effect.

Readable

invert-boolean

If true, the state of the action will be the negation of the property value, provided the property is boolean.

Readable | Writeable | Construct Only

name

The name of the action. This is mostly meaningful for identifying the action once it has been added to a #GActionMap.

Readable | Writeable | Construct Only

object

The object to wrap a property on.

The object must be a non-None #GObject with properties.

Writeable | Construct Only

parameter-type

The type of the parameter that must be given when activating the action.

Readable

property-name

The name of the property to wrap on the object.

The property must exist on the passed-in object and it must be readable and writable (and not construct-only).

Writeable | Construct Only

state

The state of the action, or None if the action is stateless.

Readable

state-type

The #GVariantType of the state that the action has, or None if the action is stateless.

Readable

Action

enabled

If @action is currently enabled.

If the action is disabled then calls to g_action_activate() and g_action_change_state() have no effect.

Readable

name

The name of the action. This is mostly meaningful for identifying the action once it has been added to a #GActionGroup. It is immutable.

Readable

parameter-type

The type of the parameter that must be given when activating the action. This is immutable, and may be None if no parameter is needed when activating the action.

Readable

state

The state of the action, or None if the action is stateless.

Readable

state-type

The #GVariantType of the state that the action has, or None if the action is stateless. This is immutable.

Readable

Implements

[trait@glib::ObjectExt], ActionExt

GLib type: GObject with reference counted clone semantics.

Implementations

impl PropertyAction

pub fn new( name: &str, object: &impl IsA<Object>, property_name: &str, ) -> PropertyAction

Creates a #GAction corresponding to the value of property @property_name on @object.

The property must be existent and readable and writable (and not construct-only).

This function takes a reference on @object and doesn’t release it until the action is destroyed.

name

the name of the action to create

object

the object that has the property to wrap

property_name

the name of the property

Returns

a new #GPropertyAction

pub fn inverts_boolean(&self) -> bool

If true, the state of the action will be the negation of the property value, provided the property is boolean.

Trait Implementations

impl Clone for PropertyAction

fn clone(&self) -> Self

Makes a clone of this shared reference.

This increments the strong reference count of the object. Dropping the object will decrement it again.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for PropertyAction

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl HasParamSpec for PropertyAction

type ParamSpec = ParamSpecObject

type SetValue = PropertyAction

Preferred value to be used as setter for the associated ParamSpec.

type BuilderFn = fn(_: &str) -> ParamSpecObjectBuilder<'_, PropertyAction>

fn param_spec_builder() -> Self::BuilderFn

impl Hash for PropertyAction

fn hash<H>(&self, state: &mut H)

where H: Hasher,

Hashes the memory address of this object.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for PropertyAction

fn cmp(&self, other: &Self) -> Ordering

Comparison for two GObjects.

Compares the memory addresses of the provided objects.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized + PartialOrd,

Restrict a value to a certain interval.

impl ParentClassIs for PropertyAction

type Parent = Object

impl<OT: ObjectType> PartialEq<OT> for PropertyAction

fn eq(&self, other: &OT) -> bool

Equality for two GObjects.

Two GObjects are equal if their memory addresses are equal.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<OT: ObjectType> PartialOrd<OT> for PropertyAction

fn partial_cmp(&self, other: &OT) -> Option<Ordering>

Partial comparison for two GObjects.

Compares the memory addresses of the provided objects.

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl StaticType for PropertyAction

fn static_type() -> Type

Returns the type identifier of Self.

impl Eq for PropertyAction

impl IsA<Action> for PropertyAction