Enum agui::widget::WidgetRef [−][src]
pub enum WidgetRef {
None,
Owned(Rc<dyn Widget + 'static>),
Borrowed(Weak<dyn Widget + 'static>),
Keyed {
owner_id: Option<WidgetId>,
key: Key,
widget: Box<WidgetRef, Global>,
},
}
Expand description
Holds a reference to a widget, or not.
This is generally used when a widget can accept children as a parameter. It can either be Owned
,
Borrowed
, None
, or Keyed
. A Keyed
widget is one that may retain its state across parental rebuilds.
Variants
None
No widget.
Owned(Rc<dyn Widget + 'static>)
An owned widget.
Borrowed(Weak<dyn Widget + 'static>)
A borrowed widget.
Keyed
A keyed reference which may retain its state across parental rebuilds.
Implementations
Panics
Will panic if the widget no longer exists, or the reference is empty.
Panics
Will panic if the widget no longer exists, or the reference is empty.
Panics
Will panic if the widget no longer exists, or the reference is empty.
Returns none of the widget is not the W
type, or if it has been deallocated.
Panics
Will panic if the widget cannot be downcasted to the generic type.
Trait Implementations
Performs the conversion.
impl<F> From<Builder<F>> for WidgetRef where
F: 'static + Fn(&WidgetContext<'_>) -> BuildResult,
impl<F> From<Builder<F>> for WidgetRef where
F: 'static + Fn(&WidgetContext<'_>) -> BuildResult,
Performs the conversion.
Auto Trait Implementations
impl !RefUnwindSafe for WidgetRef
impl !UnwindSafe for WidgetRef
Blanket Implementations
Mutably borrows from an owned value. Read more
impl<T> Downcast for T where
T: Any,
impl<T> Downcast for T where
T: Any,
Convert Box<dyn Trait>
(where Trait: Downcast
) to Box<dyn Any>
. Box<dyn Any>
can
then be further downcast
into Box<ConcreteType>
where ConcreteType
implements Trait
. Read more
pub fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>
pub fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>
Convert Rc<Trait>
(where Trait: Downcast
) to Rc<Any>
. Rc<Any>
can then be
further downcast
into Rc<ConcreteType>
where ConcreteType
implements Trait
. Read more
Convert &Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &Any
’s vtable from &Trait
’s. Read more
pub fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
pub fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
Convert &mut Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &mut Any
’s vtable from &mut Trait
’s. Read more