AsyncSnapshot<T> class

Immutable representation of the most recent interaction with an asynchronous computation.

See also:

• StreamBuilder, which builds itself based on a snapshot from interacting with a Stream.
• FutureBuilder, which builds itself based on a snapshot from interacting with a Future.

Constructors

AsyncSnapshot.nothing()

Creates an AsyncSnapshot in ConnectionState.none with null data and error.

const

AsyncSnapshot.waiting()

Creates an AsyncSnapshot in ConnectionState.waiting with null data and error.

const

AsyncSnapshot.withData(ConnectionState state, T data)

Creates an AsyncSnapshot in the specified state and with the specified data.

const

AsyncSnapshot.withError(ConnectionState state, Object error, [StackTrace stackTrace = StackTrace.empty])

Creates an AsyncSnapshot in the specified state with the specified error and a stackTrace.

const

Properties

connectionState → ConnectionState

Current state of connection to the asynchronous computation.

final

data → T?

The latest data received by the asynchronous computation.

final

error → Object?

The latest error object received by the asynchronous computation.

final

hasData → bool

Returns whether this snapshot contains a non-null data value.

no setter

hasError → bool

Returns whether this snapshot contains a non-null error value.

no setter

hashCode → int

The hash code for this object.

no setter, override

requireData → T

Returns latest data received, failing if there is no data.

no setter

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

stackTrace → StackTrace?

The latest stack trace object received by the asynchronous computation.

final

Methods

inState(ConnectionState state) → AsyncSnapshot<T>

Returns a snapshot like this one, but in the specified state.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

override

Operators

operator ==(Object other) → bool

The equality operator.

override