QueryListener<T> class

An internal widget used by useQuery and useMutation (or similar hooks) to listen to streams and trigger widget rebuilds.

This widget serves as a robust listener that handles stream lifecycle:

Displays initial data on first build.
Rebuilds its child whenever the subscribed stream emits a new value.
Unsubscribes from the old stream and subscribes to a new one if the stream instance changes in didUpdateWidget.
Cancels its subscription cleanly when the widget is disposed to prevent memory leaks and unnecessary processing.

Inheritance

Constructors

QueryListener({Key? key, required Stream<T> stream, required T initialData, required Widget builder(BuildContext context, T data)}): Creates a QueryListener widget.
const

builder → Widget Function(BuildContext context, T data): A builder function that receives the current data from the stream. This function is called every time the data updates, triggering a rebuild of the subtree defined by the builder.
final
hashCode → int: The hash code for this object.
no setterinherited
initialData → T: The initial data to use before the first value from the stream is received. This value is displayed immediately upon widget creation.
final
key → Key?: Controls how one widget replaces another widget in the tree.
finalinherited
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited
stream → Stream<T>: The stream to listen to for data updates.
final

createElement() → StatefulElement: Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<QueryListener<T>>: Creates the mutable state for this widget at a given location in the tree.
override
debugDescribeChildren() → List<DiagnosticsNode>: Returns a list of DiagnosticsNode objects describing this node's children.
inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void: Add additional properties associated with the node.
inherited
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
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
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug, int wrapWidth = 65}) → String: Returns a string representation of this node and its descendants.
inherited
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String: Returns a one-line detailed description of the object.
inherited
toStringShort() → String: A short, textual description of this widget.
inherited