ImageStreamCompleter class Null safety

Base class for those that manage the loading of dart:ui.Image objects for ImageStreams.

ImageStreamListener objects are rarely constructed directly. Generally, an ImageProvider subclass will return an ImageStream and automatically configure it with the right ImageStreamCompleter when possible.

Mixed in types
Implementers

Constructors

ImageStreamCompleter()

Properties

debugLabel ↔ String?
A string identifying the source of the underlying image.
read / write
hashCode → int
The hash code for this object.
read-onlyinherited
hasListeners → bool
Whether any listeners are currently registered.
protected">@protectedvisibleForTesting">@visibleForTestingread-only
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.
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.
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.
override
keepAlive() → ImageStreamCompleterHandle
Creates an ImageStreamCompleterHandle that will prevent this stream from being disposed at least until the handle is disposed.
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.
removeOnLastListenerRemovedCallback(VoidCallback callback) → void
Removes a callback previously supplied to addOnLastListenerRemovedCallback.
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.
reportImageChunkEvent(ImageChunkEvent event) → void
Calls all the registered ImageChunkListeners (listeners with an ImageStreamListener.onChunk specified) to notify them of a new ImageChunkEvent.
protected">@protected
setImage(ImageInfo image) → void
Calls all the registered listeners to notify them of a new image.
protected">@protected
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