MaybeWidget<T extends Object> class

A widget that does a null-check of provided value and returns orElse (default to SizedBox.shrink) if value is null.

Otherwise provides a builder with a non-null value.

Inheritance

Annotations

Constructors

MaybeWidget(T? value, Widget _builder(T), {Widget orElse = const SizedBox.shrink(), bool buildWhen(T)?, Key? key}): Constructor for the MaybeWidget class.
const
MaybeWidget.identifiable(T? value, Widget _builder(T), {Widget orElse = const SizedBox.shrink(), bool buildWhen(T)?, Key? key}): Identifiable constructor for the MaybeWidget class.
MaybeWidget.offstage(T? value, Widget _builder(T), {Widget orElse = const Offstage(), bool buildWhen(T)?, Key? key}): Creates a MaybeWidget that uses Offstage as the default orElse widget.
const

buildWhen → bool Function(T)?: Optional predicate that must return true for the builder to be used.
final
hashCode → int: The hash code for this object.
no setterinherited
key → Key?: Controls how one widget replaces another widget in the tree.
finalinherited
orElse → Widget: The widget to display if value is null.
final
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited
value → T?: The value to check for null.
final

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.
override
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

list<T extends Object>(T? value, {Widget? child(T)?, Iterable<Widget?> children(T)?, bool buildWhen(T value)?}) → List<Widget>: Creates a list of widgets based on a nullable value.
orNull<W extends Widget, T extends Object>(T? value, W? builder(T)?, {bool buildWhen(T value)?}) → W?: Conditional widget builder that returns null when value is null.