OrbitSelector<T extends OrbitStore, S> class

Like OrbitBuilder, but only rebuilds when the value returned by selector actually changes — useful when a store holds a lot of state but a given widget only cares about one slice of it. Also picks up an ancestor OrbitScope<T> automatically, same as OrbitBuilder.

OrbitSelector<CounterStore, int>(
  store: () => CounterStore(),
  selector: (store) => store.count,
  builder: (context, count) => Text('$count'),
)

Note: keep selector referentially stable across rebuilds where possible (e.g. a top-level or static function, or a const-friendly tear-off) rather than a fresh closure built from local state — this widget doesn't re-run selector on every parent rebuild, only when the store notifies, so it assumes the same store maps to the same derived value each time.

By default the selected value is compared with ==; pass equals for value types that need custom comparison (e.g. deep list/map equality).

Inheritance

Constructors

OrbitSelector({Key? key, required T store(), required S selector(T store), required Widget builder(BuildContext context, S value), bool equals(S previous, S next)?})
const

Properties

builder → Widget Function(BuildContext context, S value)
final
equals → bool Function(S previous, S next)?
Custom equality check used to decide whether to rebuild. Defaults to ==.
final
hashCode → int
The hash code for this object.
no setterinherited
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
selector → S Function(T store)
final
store → T Function()
final

Methods

createElement() → StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<OrbitSelector<T, S>>
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

Operators

operator ==(Object other) → bool
The equality operator.
inherited