ArnaRadio<T> class

An Arna-styled radio button.

Used to select between a number of mutually exclusive values. When one radio button in a group is selected, the other radio buttons in the group cease to be selected. The values are of type T, the type parameter of the ArnaRadio class. Enums are commonly used for this purpose.

The radio button itself does not maintain any state. Instead, selecting the radio invokes the onChanged callback, passing value as a parameter. If groupValue and value match, this radio will be selected. Most widgets will respond to onChanged by calling State.setState to update the radio button's groupValue.

See also:

• ArnaRadioListTile, which combines this widget with an ArnaListTile so that you can give the radio button a label.
• ArnaSlider, for selecting a value in a range.
• ArnaCheckbox and ArnaSwitch, for toggling a particular value on or off.

Inheritance

• Object
• DiagnosticableTree
• Widget
• StatelessWidget
• ArnaRadio

Constructors

ArnaRadio({Key? key, required T value, required T? groupValue, required ValueChanged<T?>? onChanged, bool isFocusable = true, bool autofocus = false, Color? accentColor, MouseCursor cursor = MouseCursor.defer, String? semanticLabel})

Creates An Arna-styled radio button.

const

Properties

accentColor → Color?

The color of the radio button's focused border and selected state.

final

autofocus → bool

Whether this radio button should focus itself if nothing else is already focused.

final

cursor → MouseCursor

The cursor for a mouse pointer when it enters or is hovering over the radio button.

final

groupValue → T?

The currently selected value for a group of radio buttons.

final

hashCode → int

The hash code for this object.

no setter, inherited

isFocusable → bool

Whether this radio button is focusable or not.

final

key → Key?

Controls how one widget replaces another widget in the tree.

final, inherited

onChanged → ValueChanged<T?>?

Called when the user selects this radio button.

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

semanticLabel → String?

The semantic label of the radio button.

final

value → T

The value represented by this radio button.

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}) → 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