pub struct PropertyAction { /* private fields */ }
Expand description
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 ActionExt::activate()
and
ActionExt::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 [type@Gio.ActionGroup]. 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 NULL
if no parameter is needed when
activating the action.
Readable
§state
The state of the action, or NULL
if the action is stateless.
Readable
§state-type
The [type@GLib.VariantType] of the state that the action has, or NULL
if the
action is stateless. This is immutable.
Readable
§Implements
[trait@glib::ObjectExt
], ActionExt
GLib type: GObject with reference counted clone semantics.
Implementations§
source§impl PropertyAction
impl PropertyAction
sourcepub fn new(
name: &str,
object: &impl IsA<Object>,
property_name: &str,
) -> 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
sourcepub fn inverts_boolean(&self) -> bool
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§
source§impl Clone for PropertyAction
impl Clone for PropertyAction
source§impl Debug for PropertyAction
impl Debug for PropertyAction
source§impl HasParamSpec for PropertyAction
impl HasParamSpec for PropertyAction
type ParamSpec = ParamSpecObject
source§type SetValue = PropertyAction
type SetValue = PropertyAction
type BuilderFn = fn(_: &str) -> ParamSpecObjectBuilder<'_, PropertyAction>
fn param_spec_builder() -> Self::BuilderFn
source§impl Hash for PropertyAction
impl Hash for PropertyAction
source§impl Ord for PropertyAction
impl Ord for PropertyAction
source§fn cmp(&self, other: &Self) -> Ordering
fn cmp(&self, other: &Self) -> Ordering
Comparison for two GObjects.
Compares the memory addresses of the provided objects.
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl ParentClassIs for PropertyAction
impl ParentClassIs for PropertyAction
source§impl<OT: ObjectType> PartialEq<OT> for PropertyAction
impl<OT: ObjectType> PartialEq<OT> for PropertyAction
source§impl<OT: ObjectType> PartialOrd<OT> for PropertyAction
impl<OT: ObjectType> PartialOrd<OT> for PropertyAction
source§impl StaticType for PropertyAction
impl StaticType for PropertyAction
source§fn static_type() -> Type
fn static_type() -> Type
Self
.impl Eq for PropertyAction
impl IsA<Action> for PropertyAction
Auto Trait Implementations§
impl Freeze for PropertyAction
impl RefUnwindSafe for PropertyAction
impl !Send for PropertyAction
impl !Sync for PropertyAction
impl Unpin for PropertyAction
impl UnwindSafe for PropertyAction
Blanket Implementations§
source§impl<O> ActionExt for O
impl<O> ActionExt for O
source§fn change_state(&self, value: &Variant)
fn change_state(&self, value: &Variant)
source§fn is_enabled(&self) -> bool
fn is_enabled(&self) -> bool
source§fn parameter_type(&self) -> Option<VariantType>
fn parameter_type(&self) -> Option<VariantType>
source§fn state_hint(&self) -> Option<Variant>
fn state_hint(&self) -> Option<Variant>
source§fn state_type(&self) -> Option<VariantType>
fn state_type(&self) -> Option<VariantType>
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fn connect_state_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId
fn connect_state_type_notify<F: Fn(&Self) + 'static>( &self, f: F, ) -> SignalHandlerId
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details: Quark,
args: &[Value],
) -> Option<Value>
fn emit_with_details_and_values( &self, signal_id: SignalId, details: Quark, args: &[Value], ) -> Option<Value>
source§fn disconnect(&self, handler_id: SignalHandlerId)
fn disconnect(&self, handler_id: SignalHandlerId)
source§fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId
fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId
notify
signal of the object. Read moresource§fn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId
fn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId
notify
signal of the object. Read moresource§unsafe fn connect_notify_unsafe<F>(
&self,
name: Option<&str>,
f: F,
) -> SignalHandlerId
unsafe fn connect_notify_unsafe<F>( &self, name: Option<&str>, f: F, ) -> SignalHandlerId
notify
signal of the object. Read more