ActiveObservers<T extends StatefulWidget> mixin

A type of observers that subscribes itself to the target State's lifecycle. Like ordinary observers, an active observer listens from one or many observables and reactive to the events, but the subscription is managed by the active observer rather than the observable. After subscription, data still flows from the observable to the observer. The word "active" means the observer acts actively, rather than "passively":

// passively:
observable.addListener(observer)
// actively:
observer(observable)

Active Observers pattern allows us to compose observers in a scalable way and make observers much more powerful. Inspired by React hooks. In this case, the observable being observed is a Flutter StatefulWidget State.

Superclass Constraints
Implements

Constructors

ActiveObservers()

Properties

context BuildContext
The location in the tree where this widget builds.
read-only, inherited
hashCode → int
The hash code for this object.
read-only, inherited
mounted → bool
Whether this State object is currently in a tree.
read-only, inherited
runtimeType → Type
A representation of the runtime type of the object.
read-only, inherited
widget → T
The current configuration.
read-only, inherited

Methods

assembleActiveObservers() → void
deactivate() → void
Called when this object is removed from the tree. [...]
override
didBuild() → dynamic
override
didChangeDependencies() → void
Called when a dependency of this State object changes. [...]
override
didReassemble() → void
override
didUpdateWidget(covariant T oldWidget) → void
Called whenever the widget configuration changes. [...]
override
dispose() → void
Called when this object is removed from the tree permanently. [...]
override
reactivate() → void
override
reassemble() → void
Called whenever the application is reassembled during debugging, for example during hot reload. [...]
override
setState(VoidCallback fn) → void
Notify the framework that the internal state of this object has changed. [...]
override
shouldRebuild() → bool
override
willBuild() → void
override
build(BuildContext context) Widget
Describes the part of the user interface represented by this widget.
@protected, inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
inherited
initState() → void
Called when this object is inserted into the tree.
@mustCallSuper, @protected, inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
inherited
toDiagnosticsNode({String name, DiagnosticsTreeStyle style}) DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.
inherited
toString({DiagnosticLevel minLevel: DiagnosticLevel.debug}) → String
Returns a string representation of this object.
inherited
toStringShort() → String
A brief description of this object, usually just the runtimeType and the hashCode.
inherited

Operators

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