Selector0<T> class Null safety

A base class for custom Selector.

It works with any InheritedWidget. Variants like Selector and Selector6 are just syntax sugar to use Selector0 with Provider.of.

But it will not work with values coming from anything but InheritedWidget.

As such, the following:

T value;

return Selector0(
  selector: (_) => value,
  builder: ...,
)

will still call builder again, even if value didn't change.

Inheritance
Implementers

Constructors

Selector0({Key? key, required ValueWidgetBuilder<T> builder, required T selector(BuildContext), ShouldRebuild<T>? shouldRebuild, Widget? child})
Both builder and selector must not be null.

Properties

builder → ValueWidgetBuilder<T>
A function that builds a widget tree from child and the last result of selector. [...]
final
hashCode → int
The hash code for this object. [...]
@nonVirtual, read-only, inherited
key → Key?
Controls how one widget replaces another widget in the tree. [...]
final, inherited
runtimeType → Type
A representation of the runtime type of the object.
read-only, inherited
selector → T Function(BuildContext)
A function that obtains some InheritedWidget and map their content into a new object with only a limited number of properties. [...]
final

Methods

createElement() → SingleChildStatefulElement
Creates a StatefulElement to manage this widget's location in the tree. [...]
inherited
createState() → _Selector0State<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. [...]
@protected, inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node. [...]
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent 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}) → 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. [...]
@nonVirtual, inherited