Struct gdk4::VulkanContext
source · #[repr(transparent)]pub struct VulkanContext { /* private fields */ }
Expand description
VulkanContext
is an object representing the platform-specific
Vulkan draw context.
VulkanContext
s are created for a surface using
SurfaceExt::create_vulkan_context()
, and the context will match
the characteristics of the surface.
Support for VulkanContext
is platform-specific and context creation
can fail, returning None
context.
This is an Abstract Base Class, you cannot instantiate it.
Signals
images-updated
Emitted when the images managed by this context have changed.
Usually this means that the swapchain had to be recreated, for example in response to a change of the surface size.
Implements
DrawContextExt
, gio::prelude::InitableExt
, DrawContextExtManual
Implementations§
source§impl VulkanContext
impl VulkanContext
sourcepub fn connect_images_updated<F: Fn(&Self) + 'static>(
&self,
f: F
) -> SignalHandlerId
pub fn connect_images_updated<F: Fn(&Self) + 'static>( &self, f: F ) -> SignalHandlerId
Emitted when the images managed by this context have changed.
Usually this means that the swapchain had to be recreated, for example in response to a change of the surface size.
Trait Implementations§
source§impl Clone for VulkanContext
impl Clone for VulkanContext
source§impl Debug for VulkanContext
impl Debug for VulkanContext
source§impl Display for VulkanContext
impl Display for VulkanContext
source§impl HasParamSpec for VulkanContext
impl HasParamSpec for VulkanContext
type ParamSpec = ParamSpecObject
§type SetValue = VulkanContext
type SetValue = VulkanContext
type BuilderFn = fn(_: &str) -> ParamSpecObjectBuilder<'_, VulkanContext>
fn param_spec_builder() -> Self::BuilderFn
source§impl Hash for VulkanContext
impl Hash for VulkanContext
source§impl Ord for VulkanContext
impl Ord for VulkanContext
source§impl ParentClassIs for VulkanContext
impl ParentClassIs for VulkanContext
type Parent = DrawContext
source§impl<OT: ObjectType> PartialEq<OT> for VulkanContext
impl<OT: ObjectType> PartialEq<OT> for VulkanContext
source§impl<OT: ObjectType> PartialOrd<OT> for VulkanContext
impl<OT: ObjectType> PartialOrd<OT> for VulkanContext
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moresource§impl StaticType for VulkanContext
impl StaticType for VulkanContext
source§fn static_type() -> Type
fn static_type() -> Type
Self
.impl Eq for VulkanContext
impl IsA<DrawContext> for VulkanContext
impl IsA<Initable> for VulkanContext
Auto Trait Implementations§
impl RefUnwindSafe for VulkanContext
impl !Send for VulkanContext
impl !Sync for VulkanContext
impl Unpin for VulkanContext
impl UnwindSafe for VulkanContext
Blanket Implementations§
source§impl<T> Cast for Twhere
T: ObjectType,
impl<T> Cast for Twhere T: ObjectType,
source§fn upcast<T>(self) -> Twhere
T: ObjectType,
Self: IsA<T>,
fn upcast<T>(self) -> Twhere T: ObjectType, Self: IsA<T>,
T
. Read moresource§fn upcast_ref<T>(&self) -> &Twhere
T: ObjectType,
Self: IsA<T>,
fn upcast_ref<T>(&self) -> &Twhere T: ObjectType, Self: IsA<T>,
T
. Read moresource§fn downcast<T>(self) -> Result<T, Self>where
T: ObjectType,
Self: CanDowncast<T>,
fn downcast<T>(self) -> Result<T, Self>where T: ObjectType, Self: CanDowncast<T>,
T
. Read moresource§fn downcast_ref<T>(&self) -> Option<&T>where
T: ObjectType,
Self: CanDowncast<T>,
fn downcast_ref<T>(&self) -> Option<&T>where T: ObjectType, Self: CanDowncast<T>,
T
. Read moresource§fn dynamic_cast<T>(self) -> Result<T, Self>where
T: ObjectType,
fn dynamic_cast<T>(self) -> Result<T, Self>where T: ObjectType,
T
. This handles upcasting, downcasting
and casting between interface and interface implementors. All checks are performed at
runtime, while upcast
will do many checks at compile-time already. downcast
will
perform the same checks at runtime as dynamic_cast
, but will also ensure some amount of
compile-time safety. Read moresource§fn dynamic_cast_ref<T>(&self) -> Option<&T>where
T: ObjectType,
fn dynamic_cast_ref<T>(&self) -> Option<&T>where T: ObjectType,
T
. This handles upcasting, downcasting
and casting between interface and interface implementors. All checks are performed at
runtime, while downcast
and upcast
will do many checks at compile-time already. Read moresource§unsafe fn unsafe_cast<T>(self) -> Twhere
T: ObjectType,
unsafe fn unsafe_cast<T>(self) -> Twhere T: ObjectType,
T
unconditionally. Read moresource§unsafe fn unsafe_cast_ref<T>(&self) -> &Twhere
T: ObjectType,
unsafe fn unsafe_cast_ref<T>(&self) -> &Twhere T: ObjectType,
&T
unconditionally. Read moresource§impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GList> for Twhere
T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,
impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GList> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,
source§impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GPtrArray> for Twhere
T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,
impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GPtrArray> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,
source§impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GSList> for Twhere
T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,
impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GSList> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,
source§impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GList> for Twhere
T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,
impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GList> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,
source§impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GPtrArray> for Twhere
T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,
impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GPtrArray> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,
source§impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GSList> for Twhere
T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,
impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GSList> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,
source§impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GList> for Twhere
T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,
impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GList> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,
source§impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GPtrArray> for Twhere
T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,
impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GPtrArray> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,
source§impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GSList> for Twhere
T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,
impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GSList> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,
source§impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GList> for Twhere
T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,
impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GList> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,
source§impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GPtrArray> for Twhere
T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,
impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GPtrArray> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,
source§impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GSList> for Twhere
T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,
impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GSList> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,
source§impl<O> InitableExt for Owhere
O: IsA<Initable>,
impl<O> InitableExt for Owhere O: IsA<Initable>,
source§impl<T> IntoClosureReturnValue for Twhere
T: Into<Value>,
impl<T> IntoClosureReturnValue for Twhere T: Into<Value>,
fn into_closure_return_value(self) -> Option<Value>
source§impl<U> IsSubclassableExt for Uwhere
U: IsClass + ParentClassIs,
impl<U> IsSubclassableExt for Uwhere U: IsClass + ParentClassIs,
fn parent_class_init<T>(class: &mut Class<U>)where T: ObjectSubclass, <U as ParentClassIs>::Parent: IsSubclassable<T>,
fn parent_instance_init<T>(instance: &mut InitializingObject<T>)where T: ObjectSubclass, <U as ParentClassIs>::Parent: IsSubclassable<T>,
source§impl<T> ObjectExt for Twhere
T: ObjectType,
impl<T> ObjectExt for Twhere T: ObjectType,
source§fn is<U>(&self) -> boolwhere
U: StaticType,
fn is<U>(&self) -> boolwhere U: StaticType,
true
if the object is an instance of (can be cast to) T
.source§fn object_class(&self) -> &Class<Object>
fn object_class(&self) -> &Class<Object>
ObjectClass
of the object. Read moresource§fn class_of<U>(&self) -> Option<&Class<U>>where
U: IsClass,
fn class_of<U>(&self) -> Option<&Class<U>>where U: IsClass,
T
. Read moresource§fn interface<U>(&self) -> Option<InterfaceRef<'_, U>>where
U: IsInterface,
fn interface<U>(&self) -> Option<InterfaceRef<'_, U>>where U: IsInterface,
T
of the object. Read moresource§fn set_property_from_value(&self, property_name: &str, value: &Value)
fn set_property_from_value(&self, property_name: &str, value: &Value)
source§fn set_properties(&self, property_values: &[(&str, &dyn ToValue)])
fn set_properties(&self, property_values: &[(&str, &dyn ToValue)])
source§fn set_properties_from_value(&self, property_values: &[(&str, Value)])
fn set_properties_from_value(&self, property_values: &[(&str, Value)])
source§fn property<V>(&self, property_name: &str) -> Vwhere
V: for<'b> FromValue<'b> + 'static,
fn property<V>(&self, property_name: &str) -> Vwhere V: for<'b> FromValue<'b> + 'static,
property_name
of the object and cast it to the type V. Read moresource§fn property_value(&self, property_name: &str) -> Value
fn property_value(&self, property_name: &str) -> Value
property_name
of the object. Read moresource§fn property_type(&self, property_name: &str) -> Option<Type>
fn property_type(&self, property_name: &str) -> Option<Type>
property_name
of this object. Read moresource§fn find_property(&self, property_name: &str) -> Option<ParamSpec>
fn find_property(&self, property_name: &str) -> Option<ParamSpec>
ParamSpec
of the property property_name
of this object.source§fn list_properties(&self) -> PtrSlice<ParamSpec>
fn list_properties(&self) -> PtrSlice<ParamSpec>
ParamSpec
of the properties of this object.source§fn freeze_notify(&self) -> PropertyNotificationFreezeGuard
fn freeze_notify(&self) -> PropertyNotificationFreezeGuard
source§unsafe fn set_qdata<QD>(&self, key: Quark, value: QD)where
QD: 'static,
unsafe fn set_qdata<QD>(&self, key: Quark, value: QD)where QD: 'static,
key
. Read moresource§unsafe fn qdata<QD>(&self, key: Quark) -> Option<NonNull<QD>>where
QD: 'static,
unsafe fn qdata<QD>(&self, key: Quark) -> Option<NonNull<QD>>where QD: 'static,
key
. Read moresource§unsafe fn steal_qdata<QD>(&self, key: Quark) -> Option<QD>where
QD: 'static,
unsafe fn steal_qdata<QD>(&self, key: Quark) -> Option<QD>where QD: 'static,
key
. Read moresource§unsafe fn set_data<QD>(&self, key: &str, value: QD)where
QD: 'static,
unsafe fn set_data<QD>(&self, key: &str, value: QD)where QD: 'static,
key
. Read moresource§unsafe fn data<QD>(&self, key: &str) -> Option<NonNull<QD>>where
QD: 'static,
unsafe fn data<QD>(&self, key: &str) -> Option<NonNull<QD>>where QD: 'static,
key
. Read moresource§unsafe fn steal_data<QD>(&self, key: &str) -> Option<QD>where
QD: 'static,
unsafe fn steal_data<QD>(&self, key: &str) -> Option<QD>where QD: 'static,
key
. Read moresource§fn block_signal(&self, handler_id: &SignalHandlerId)
fn block_signal(&self, handler_id: &SignalHandlerId)
source§fn unblock_signal(&self, handler_id: &SignalHandlerId)
fn unblock_signal(&self, handler_id: &SignalHandlerId)
source§fn stop_signal_emission(&self, signal_id: SignalId, detail: Option<Quark>)
fn stop_signal_emission(&self, signal_id: SignalId, detail: Option<Quark>)
source§fn stop_signal_emission_by_name(&self, signal_name: &str)
fn stop_signal_emission_by_name(&self, signal_name: &str)
source§fn connect<F>(
&self,
signal_name: &str,
after: bool,
callback: F
) -> SignalHandlerIdwhere
F: Fn(&[Value]) -> Option<Value> + Send + Sync + 'static,
fn connect<F>( &self, signal_name: &str, after: bool, callback: F ) -> SignalHandlerIdwhere F: Fn(&[Value]) -> Option<Value> + Send + Sync + 'static,
signal_name
on this object. Read moresource§fn connect_id<F>(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
callback: F
) -> SignalHandlerIdwhere
F: Fn(&[Value]) -> Option<Value> + Send + Sync + 'static,
fn connect_id<F>( &self, signal_id: SignalId, details: Option<Quark>, after: bool, callback: F ) -> SignalHandlerIdwhere F: Fn(&[Value]) -> Option<Value> + Send + Sync + 'static,
signal_id
on this object. Read moresource§fn connect_local<F>(
&self,
signal_name: &str,
after: bool,
callback: F
) -> SignalHandlerIdwhere
F: Fn(&[Value]) -> Option<Value> + 'static,
fn connect_local<F>( &self, signal_name: &str, after: bool, callback: F ) -> SignalHandlerIdwhere F: Fn(&[Value]) -> Option<Value> + 'static,
signal_name
on this object. Read moresource§fn connect_local_id<F>(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
callback: F
) -> SignalHandlerIdwhere
F: Fn(&[Value]) -> Option<Value> + 'static,
fn connect_local_id<F>( &self, signal_id: SignalId, details: Option<Quark>, after: bool, callback: F ) -> SignalHandlerIdwhere F: Fn(&[Value]) -> Option<Value> + 'static,
signal_id
on this object. Read moresource§unsafe fn connect_unsafe<F>(
&self,
signal_name: &str,
after: bool,
callback: F
) -> SignalHandlerIdwhere
F: Fn(&[Value]) -> Option<Value>,
unsafe fn connect_unsafe<F>( &self, signal_name: &str, after: bool, callback: F ) -> SignalHandlerIdwhere F: Fn(&[Value]) -> Option<Value>,
signal_name
on this object. Read moresource§unsafe fn connect_unsafe_id<F>(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
callback: F
) -> SignalHandlerIdwhere
F: Fn(&[Value]) -> Option<Value>,
unsafe fn connect_unsafe_id<F>( &self, signal_id: SignalId, details: Option<Quark>, after: bool, callback: F ) -> SignalHandlerIdwhere F: Fn(&[Value]) -> Option<Value>,
signal_id
on this object. Read moresource§fn connect_closure(
&self,
signal_name: &str,
after: bool,
closure: RustClosure
) -> SignalHandlerId
fn connect_closure( &self, signal_name: &str, after: bool, closure: RustClosure ) -> SignalHandlerId
signal_name
on this object. Read moresource§fn connect_closure_id(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
closure: RustClosure
) -> SignalHandlerId
fn connect_closure_id( &self, signal_id: SignalId, details: Option<Quark>, after: bool, closure: RustClosure ) -> SignalHandlerId
signal_id
on this object. Read moresource§fn watch_closure(&self, closure: &impl AsRef<Closure>)
fn watch_closure(&self, closure: &impl AsRef<Closure>)
closure
to the lifetime of the object. When
the object’s reference count drops to zero, the closure will be
invalidated. An invalidated closure will ignore any calls to
invoke_with_values
, or
invoke
when using Rust closures.source§fn emit<R>(&self, signal_id: SignalId, args: &[&dyn ToValue]) -> Rwhere
R: TryFromClosureReturnValue,
fn emit<R>(&self, signal_id: SignalId, args: &[&dyn ToValue]) -> Rwhere R: TryFromClosureReturnValue,
source§fn emit_with_values(&self, signal_id: SignalId, args: &[Value]) -> Option<Value>
fn emit_with_values(&self, signal_id: SignalId, args: &[Value]) -> Option<Value>
Self::emit
but takes Value
for the arguments.source§fn emit_by_name<R>(&self, signal_name: &str, args: &[&dyn ToValue]) -> Rwhere
R: TryFromClosureReturnValue,
fn emit_by_name<R>(&self, signal_name: &str, args: &[&dyn ToValue]) -> Rwhere R: TryFromClosureReturnValue,
source§fn emit_by_name_with_values(
&self,
signal_name: &str,
args: &[Value]
) -> Option<Value>
fn emit_by_name_with_values( &self, signal_name: &str, args: &[Value] ) -> Option<Value>
source§fn emit_by_name_with_details<R>(
&self,
signal_name: &str,
details: Quark,
args: &[&dyn ToValue]
) -> Rwhere
R: TryFromClosureReturnValue,
fn emit_by_name_with_details<R>( &self, signal_name: &str, details: Quark, args: &[&dyn ToValue] ) -> Rwhere R: TryFromClosureReturnValue,
source§fn emit_by_name_with_details_and_values(
&self,
signal_name: &str,
details: Quark,
args: &[Value]
) -> Option<Value>
fn emit_by_name_with_details_and_values( &self, signal_name: &str, details: Quark, args: &[Value] ) -> Option<Value>
source§fn emit_with_details<R>(
&self,
signal_id: SignalId,
details: Quark,
args: &[&dyn ToValue]
) -> Rwhere
R: TryFromClosureReturnValue,
fn emit_with_details<R>( &self, signal_id: SignalId, details: Quark, args: &[&dyn ToValue] ) -> Rwhere R: TryFromClosureReturnValue,
source§fn emit_with_details_and_values(
&self,
signal_id: SignalId,
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) -> SignalHandlerIdwhere
F: Fn(&T, &ParamSpec) + Send + Sync + 'static,
fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec) + Send + Sync + 'static,
notify
signal of the object. Read moresource§fn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere
F: Fn(&T, &ParamSpec) + 'static,
fn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec) + 'static,
notify
signal of the object. Read moresource§unsafe fn connect_notify_unsafe<F>(
&self,
name: Option<&str>,
f: F
) -> SignalHandlerIdwhere
F: Fn(&T, &ParamSpec),
unsafe fn connect_notify_unsafe<F>( &self, name: Option<&str>, f: F ) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec),
notify
signal of the object. Read more