ReactiveFormConsumer class Null safety

Obtains FormGroup from its ancestors and passes its value to builder.

The ReactiveFormConsumerBuilder widget doesn't do any fancy work. It just calls ReactiveForm.of in a new widget, and delegates its build implementation to builder.

builder must not be null and may be called multiple times (such as when the FormGroup validity change).

The ReactiveFormConsumerBuilder has two main responsibilities:

  • Obtains the nearest FormGroup from its ancestors.
  • Register the current context with the changes in the FormGroup so that if the validity of the FormGroup change then the current context is rebuilt.
Inheritance

Constructors

ReactiveFormConsumer({Key? key, required ReactiveFormConsumerBuilder builder, Widget? child})
Creates an instance of the ReactiveFormConsumer builder must not be null. [...]
const

Properties

builder ReactiveFormConsumerBuilder
final
child Widget?
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

Methods

build(BuildContext context) Widget
Describes the part of the user interface represented by this widget. [...]
override
createElement() StatelessElement
Creates a StatelessElement to manage this widget's location in the tree. [...]
inherited
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