ImageStream class
A handle to an image resource.
ImageStream represents a handle to a dart:ui.Image object and its scale (together represented by an ImageInfo object). The underlying image object might change over time, either because the image is animating or because the underlying image resource was mutated.
ImageStream objects can also represent an image that hasn't finished loading.
ImageStream objects are backed by ImageStreamCompleter objects.
The ImageCache will consider an image to be live until the listener count drops to zero after adding at least one listener. The ImageStreamCompleter.addOnLastListenerRemovedCallback method is used for tracking this information.
See also:
- ImageProvider, which has an example that includes the use of an ImageStream in a Widget.
- Mixed-in types
Constructors
- ImageStream()
- Create an initially unbound image stream.
Properties
- completer → ImageStreamCompleter?
-
The completer that has been assigned to this image stream.
no setter
- hashCode → int
-
The hash code for this object.
no setterinherited
- key → Object
-
Returns an object which can be used with
==to determine if this ImageStream shares the same listeners list as another ImageStream.no setter - runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
addListener(
ImageStreamListener listener) → void - Adds a listener callback that is called whenever a new concrete ImageInfo object is available. If a concrete image is already available, this object will call the listener synchronously.
-
debugFillProperties(
DiagnosticPropertiesBuilder properties) → void -
Add additional properties associated with the node.
override
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
removeListener(
ImageStreamListener listener) → void - Stops listening for events from this stream's ImageStreamCompleter.
-
setCompleter(
ImageStreamCompleter value) → void - Assigns a particular ImageStreamCompleter to this ImageStream.
-
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