NavigationIndicator class Null safety

Selection Indicator for the Material 3 NavigationBar and NavigationRail components.

When animation is 0, the indicator is not present. As animation grows from 0 to 1, the indicator scales in on the x axis.

Used in a Stack widget behind the icons in the Material 3 Navigation Bar to illuminate the selected destination.

Inheritance

Constructors

Builds an indicator, usually used in a stack behind the icon of a navigation bar destination.
const

Properties

animation Animation<double>
Determines the scale of the indicator.
final
borderRadius BorderRadius
The border radius of the shape of the indicator.
final
color Color?
The fill color of this indicator.
final
hashCode int
The hash code for this object.
@nonVirtual, read-only, inherited
height double
The height of this indicator.
final
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
shape ShapeBorder?
The shape of the indicator.
final
width double
The width of this indicator.
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.
@protected, inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent 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.
@nonVirtual, inherited