ImageStreamCompleter class abstract

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.new()

Properties

debugLabel ↔ String?
A string identifying the source of the underlying image.
getter/setter pair
hashCode → int
The hash code for this object.
no setterinherited
hasListeners → bool
Whether any listeners are currently registered.
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

addEphemeralErrorListener(ImageErrorListener listener) → void
Adds an error listener callback that is called when the first error is reported.
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.
maybeDispose() → void
Disposes this ImageStreamCompleter unless:
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
onDisposed() → void
Called when this ImageStreamCompleter has actually been disposed.
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.
setImage(ImageInfo image) → void
Calls all the registered listeners to notify them of a new image.
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