PrismDropdown<T> class

A dropdown field with a label, an optional icon, and validation.

Wraps DropdownButtonFormField and adds a Semantics label, which the default does not have.

PrismDropdown<String>(
  value: 'pro',
  items: const [
    PrismDropdownItem(value: 'free', label: 'Free'),
    PrismDropdownItem(value: 'pro', label: 'Pro'),
  ],
  onChanged: (v) => setState(() => plan = v),
  label: 'Plan',
  icon: Icons.card_membership,
  validator: (v) => v == null ? 'Pick a plan' : null,
)
Inheritance

Constructors

PrismDropdown({Key? key, required T? value, required List<PrismDropdownItem<T>> items, required ValueChanged<T?>? onChanged, String? label, String? hint, IconData? icon, String? validator(T?)?, bool enabled = true})
Creates a dropdown field.
const

Properties

enabled → bool
Whether the field can be changed.
final
hashCode → int
The hash code for this object.
no setterinherited
hint → String?
Hint text inside the field.
final
icon → IconData?
Optional leading icon.
final
items → List<PrismDropdownItem<T>>
The options.
final
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
label → String?
Label above the field.
final
onChanged → ValueChanged<T?>?
Called with the newly selected value. Null makes it read-only.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
validator → String? Function(T?)?
Validation function. Returns an error message, or null if valid.
final
value → T?
The currently selected value, or null.
final

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, 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