TweenStream class

Creates a Stream that emits values starting from startValue and incrementing according to the ease type over the duration.

This function is generally useful for transitions, such as animating items across a screen or muting the volume of a sound gracefully.

Example

new TweenStream(0.0, 100.0, const Duration(seconds: 1), ease: Ease.IN)
  .listen((i) => view.setLeft(i)); // Imaginary API as an example

Constructors

TweenStream(double startValue, double changeInTime, Duration duration, int intervalMs, Ease ease)

Properties

controller → StreamController<double>
final
first → Future<double>
The first element of this stream.
read-only, inherited
hashCode → int
The hash code for this object.
read-only, inherited
isBroadcast → bool
Whether this stream is a broadcast stream.
read-only, inherited
isEmpty → Future<bool>
Whether this stream contains any elements.
read-only, inherited
last → Future<double>
The last element of this stream.
read-only, inherited
length → Future<int>
The number of elements in this stream.
read-only, inherited
runtimeType → Type
A representation of the runtime type of the object.
read-only, inherited
single → Future<double>
The single element of this stream.
read-only, inherited

Methods

listen(void onData(double event), {Function onError, void onDone(), bool cancelOnError}) → StreamSubscription<double>
Adds a subscription to this stream. [...]
any(bool test(double element)) → Future<bool>
Checks whether test accepts any element provided by this stream.
inherited
asBroadcastStream({void onListen(StreamSubscription<double> subscription), void onCancel(StreamSubscription<double> subscription)}) → Stream<double>
Returns a multi-subscription stream that produces the same events as this.
inherited
asyncExpand<E>(Stream<E> convert(double event)) → Stream<E>
Transforms each element into a sequence of asynchronous events.
inherited
asyncMap<E>(FutureOr<E> convert(double event)) → Stream<E>
Creates a new stream with each data event of this stream asynchronously mapped to a new event.
inherited
cast<R>() → Stream<R>
Adapt this stream to be a Stream<R>.
inherited
contains(Object needle) → Future<bool>
Returns whether needle occurs in the elements provided by this stream.
inherited
distinct([bool equals(double previous, double next)]) → Stream<double>
Skips data events if they are equal to the previous data event.
inherited
drain<E>([E futureValue]) → Future<E>
Discards all data on this stream, but signals when it is done or an error occurred.
inherited
elementAt(int index) → Future<double>
Returns the value of the indexth data event of this stream.
inherited
every(bool test(double element)) → Future<bool>
Checks whether test accepts all elements provided by this stream.
inherited
expand<S>(Iterable<S> convert(double element)) → Stream<S>
Transforms each element of this stream into a sequence of elements.
inherited
firstWhere(bool test(double element), {double orElse()}) → Future<double>
Finds the first element of this stream matching test.
inherited
fold<S>(S initialValue, S combine(S previous, double element)) → Future<S>
Combines a sequence of values by repeatedly applying combine.
inherited
forEach(void action(double element)) → Future
Executes action on each element of this stream.
inherited
handleError(Function onError, {bool test(dynamic error)}) → Stream<double>
Creates a wrapper Stream that intercepts some errors from this stream.
inherited
join([String separator = ""]) → Future<String>
Combines the string representation of elements into a single string.
inherited
lastWhere(bool test(double element), {double orElse()}) → Future<double>
Finds the last element in this stream matching test.
inherited
map<S>(S convert(double event)) → Stream<S>
Transforms each element of this stream into a new stream event.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
inherited
pipe(StreamConsumer<double> streamConsumer) → Future
Pipes the events of this stream into streamConsumer.
inherited
reduce(double combine(double previous, double element)) → Future<double>
Combines a sequence of values by repeatedly applying combine.
inherited
singleWhere(bool test(double element), {double orElse()}) → Future<double>
Finds the single element in this stream matching test.
inherited
skip(int count) → Stream<double>
Skips the first count data events from this stream.
inherited
skipWhile(bool test(double element)) → Stream<double>
Skip data events from this stream while they are matched by test.
inherited
take(int count) → Stream<double>
Provides at most the first count data events of this stream.
inherited
takeWhile(bool test(double element)) → Stream<double>
Forwards data events while test is successful.
inherited
timeout(Duration timeLimit, {void onTimeout(EventSink<double> sink)}) → Stream<double>
Creates a new stream with the same events as this stream.
inherited
toList() → Future<List<double>>
Collects all elements of this stream in a List.
inherited
toSet() → Future<Set<double>>
Collects the data of this stream in a Set.
inherited
toString() → String
Returns a string representation of this object.
inherited
transform<S>(StreamTransformer<double, S> streamTransformer) → Stream<S>
Applies streamTransformer to this stream.
inherited
where(bool test(double event)) → Stream<double>
Creates a new stream from this stream that discards some elements.
inherited

Operators

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

Static Methods

sampleFromValues<T>(Sampler sampler, double startValue, double changeInTime, int durationMs, int intervalMs) → Stream<double>