AsyncSnapshot<T> class
Null safety
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.
- Annotations
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 specifieddata
.const - AsyncSnapshot.withError(ConnectionState state, Object error, [StackTrace stackTrace = StackTrace.empty])
-
Creates an AsyncSnapshot in the specified
state
with the specifiederror
and astackTrace
.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.
read-only
- hasError → bool
-
Returns whether this snapshot contains a non-null error value.
read-only
- hashCode → int
-
The hash code for this object.
read-onlyoverride
- requireData → T
-
Returns latest data received, failing if there is no data.
read-only
- runtimeType → Type
-
A representation of the runtime type of the object.
read-onlyinherited
- 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 non-existent method or property is accessed.
inherited
-
toString(
) → String -
A string representation of this object.
override
Operators
-
operator ==(
Object other) → bool -
The equality operator.
override