A widget that does not require mutable state.

A stateless widget is a widget that describes part of the user interface by building a constellation of other widgets that describe the user interface more concretely. The building process continues recursively until the description of the user interface is fully concrete (e.g., consists entirely of RenderObjectWidgets, which describe concrete RenderObjects).

Stateless widget are useful when the part of the user interface you are describing does not depend on anything other than the configuration information in the object itself and the BuildContext in which the widget is inflated. For compositions that can change dynamically, e.g. due to having an internal clock-driven state, or depending on some system state, consider using StatefulWidget.

See also:

  • StatefulWidget and State, for widgets that can build differently several times over their lifetime.
  • InheritedWidget, for widgets that introduce ambient state that can be read by descendant widgets.
Inheritance
  • Object
  • Widget
  • StatelessWidget

Constructors

StatelessWidget({Key key })

Initializes key for subclasses.

const

Properties

hashCode int

The hash code for this object.

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

Operators

operator ==(other) bool

The equality operator.

inherited

Methods

build(BuildContext context) Widget

Describes the part of the user interface represented by this widget.

protected
createElement() StatelessElement

Creates a StatelessElement to manage this widget's location in the tree.

debugFillDescription(List<String> description) → void

Add additional information to the given description for use by toString.

mustCallSuper, protected, inherited
noSuchMethod(Invocation invocation) → dynamic

Invoked when a non-existent method or property is accessed.

inherited
toString() String

Returns a string representation of this object.

inherited
toStringShort() String

A short, textual description of this widget.

inherited