OneFrameImageStreamCompleter class Null safety

Manages the loading of dart:ui.Image objects for static ImageStreams (those with only one frame).

Inheritance

Constructors

OneFrameImageStreamCompleter(Future<ImageInfo> image, {InformationCollector? informationCollector})
Creates a manager for one-frame ImageStreams.

Properties

debugLabel ↔ String?
A string identifying the source of the underlying image.
read / writeinherited
hashCode → int
The hash code for this object.
read-onlyinherited
hasListeners → bool
Whether any listeners are currently registered.
protected">@protectedvisibleForTesting">@visibleForTestingread-onlyinherited
runtimeType → Type
A representation of the runtime type of the object.
read-onlyinherited

Methods

addListener(ImageStreamListener listener) → void
Adds a listener callback that is called whenever a new concrete ImageInfo object is available or an error is reported. If a concrete image is already available, or if an error has been already reported, this object will notify the listener synchronously.
inherited
addOnLastListenerRemovedCallback(VoidCallback callback) → void
Adds a callback to call when removeListener results in an empty list of listeners and there are no keepAlive handles outstanding.
inherited
debugFillProperties(DiagnosticPropertiesBuilder description) → void
Accumulates a list of strings describing the object's state. Subclasses should override this to have their information included in toString.
inherited
keepAlive() → ImageStreamCompleterHandle
Creates an ImageStreamCompleterHandle that will prevent this stream from being disposed at least until the handle is disposed.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
inherited
removeListener(ImageStreamListener listener) → void
Stops the specified listener from receiving image stream events.
inherited
removeOnLastListenerRemovedCallback(VoidCallback callback) → void
Removes a callback previously supplied to addOnLastListenerRemovedCallback.
inherited
reportError({DiagnosticsNode? context, required Object exception, StackTrace? stack, InformationCollector? informationCollector, bool silent = false}) → void
Calls all the registered error listeners to notify them of an error that occurred while resolving the image.
inherited
reportImageChunkEvent(ImageChunkEvent event) → void
Calls all the registered ImageChunkListeners (listeners with an ImageStreamListener.onChunk specified) to notify them of a new ImageChunkEvent.
protected">@protectedinherited
setImage(ImageInfo image) → void
Calls all the registered listeners to notify them of a new image.
protected">@protectedinherited
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.info}) → String
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 ==(Object other) → bool
The equality operator.
inherited