ObservableReference<T> class

A mutable object holder that allows listening on a stream of changes.

Changes to the value using value= are added to a broadcast stream. If the new value is equivalent to the current value, nothing's added to the stream.

Inheritance
Mixed-in types
Implementers

Constructors

ObservableReference(T? _value, {EqualsFn<T?> equalsFn = _defaultEq, bool coalesce = false})
Creates a listenable value holder, starting with the given value. Optionally takes custom equality function. Changes are published synchronously by default. When coalesce is set, the changes in the current execution block are collected, and only the last value will be published (in an async scheduled microtask).

Properties

changes → Stream<Change<T?>>
Provides a stream of change pairs.
no setterinherited
firstNonNull → Future<T?>
Blocks until value is non-null, and then completes with that value.
no setterinherited
hashCode → int
The hash code for this object.
no setterinherited
hasListener → bool
Whether there is a subscriber to stream or changes.
no setterinherited
nonNullValues → Stream<T?>
A Stream of all non-null values on this view, including the current value at the time the stream is listened to (if it's non-null).
no setteroverride
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
stream → Stream<T?>
Provides a stream of object values when the reference changes.
no setterinherited
value ↔ T?
The currently-set value.
getter/setter pairoverride-getter
values → Stream<T?>
A Stream of all values on this view, including the current value at the time the stream is listened to.
no setterinherited

Methods

dispose() → void
Disposes this disposable and any resources it has open.
override
listen(Stream<T> stream) → Future
Listens to the given stream and sets the reference's value to whatever is emitted on the stream.
map<M>(M mapper(T?)) → ObservableView<M>
Returns a new ObservableView which is created by lazily calling mapper on this view's value, stream, and changes properties.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
notifyChange([T? previous, T? next]) → void
Notifies the streams about a new value (or forces the notification without equality check).
inherited
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited