A material widget displayed at the bottom of an app for selecting among a small number of views.

The bottom navigation bar consists of multiple items in the form of text labels, icons, or both, laid out on top of a piece of material. It provides quick navigation between the top-level views of an app. For larger screens, side navigation may be a better fit.

A bottom navigation bar is usually used in conjunction with a Scaffold, where it is provided as the Scaffold.bottomNavigationBar argument.

See also:

Inheritance

Constructors

BottomNavigationBar({Key key, @required List<BottomNavigationBarItem> items, ValueChanged<int> onTap, int currentIndex: 0, BottomNavigationBarType type, Color fixedColor, double iconSize: 24.0 })
Creates a bottom navigation bar, typically used in a Scaffold where it is provided as the Scaffold.bottomNavigationBar argument. [...]

Properties

currentIndex int
The index into items of the current active item.
final
fixedColor Color
The color of the selected item when bottom navigation bar is BottomNavigationBarType.fixed. [...]
final
iconSize double
The size of all of the BottomNavigationBarItem icons. [...]
final
items List<BottomNavigationBarItem>
The interactive items laid out within the bottom navigation bar.
final
onTap ValueChanged<int>
The callback that is called when a item is tapped. [...]
final
type BottomNavigationBarType
Defines the layout and behavior of a BottomNavigationBar. [...]
final
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

Methods

createState() → _BottomNavigationBarState
Creates the mutable state for this widget at a given location in the tree. [...]
createElement() StatefulElement
Creates a StatefulElement 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 description) → 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 toStringDeep. [...]
inherited
toString({DiagnosticLevel minLevel: DiagnosticLevel.debug }) String
Returns 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 ==(other) bool
The equality operator. [...]
inherited