FormPartBuilder<T extends FormPartState> class

A ValueListenableBuilder listens to a FormPart's FormPartState. Provided node may be a field FieldController or a form FormControllerMixin.

Use this widget to build a widget that depends on the FormPart's ValidationState. Example:

final formPart = FormPart<FormPartState>();

class SubmitButton extends StatelessWidget {
  Widget build(BuildContext context) {
    return FormPartBuilder(
      node: formPart,
      builder: (context, state, child) {
        final enabled = state.validationState != ValidationState.invalid;
        return ElevatedButton(
          onPressed: enabled ? () => _submitAction() : null,
          child: Text('Submit'),
        );
      },
    );
  }
}
Inheritance

Constructors

FormPartBuilder({Key? key, required FormPart<T> node, required ValueWidgetBuilder<T> builder, Widget? child})
A ValueListenableBuilder listens to a FormPart's FormPartState. Provided node may be a field FieldController or a form FormControllerMixin.
const

Properties

builder → ValueWidgetBuilder<T>
final
child → Widget?
final
hashCode → int
The hash code for this object.
no setterinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
node → FormPart<T>
The FormPart to which this FormPartBuilder is attached.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

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.
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}) → 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