FutureInvoker<T extends AsyncOperationNotifier<R, P>, R, P> class abstract

Turns Future based async operation to callback based state machine.

T is type of a parameter for execute, which must implement AsyncOperationNotifier with R and P. R is result type of the asynchronous operation. P is type of progress report.

Most of widget does not handle Future gracefully, so, this class helps translated Future based asynchronous operation to callback based notification.

Implementers

• AsyncValidatorExecutor

Constructors

FutureInvoker({required R defaultResult, AsyncErrorHandler? canceledOperationErrorHandler, Equality<T> parameterEquality = const Equality(), String? debugLabel})

Creates new FutureInvoker.

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

status → AsyncOperationStatus

AsyncOperationStatus of this invoker.

no setter

Methods

cancel() → void

Cancels pending operation.

execute(T parameter) → R?

Execute the asynchronous operation.

executeAsync(T parameter) → FutureOr<R>

Do actual asynchronous operation. Note that the override can call AsyncOperationNotifier.onProgress in arbitrary timings and frequrencies.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

reset(R? newDefaultResult) → void

Resets this operation state to initial state with specified new initial value.

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited