DefaultTabController class Null safety

The TabController for descendant widgets that don't specify one explicitly.

DefaultTabController is an inherited widget that is used to share a TabController with a TabBar or a TabBarView. It's used when sharing an explicitly created TabController isn't convenient because the tab bar widgets are created by a stateless parent widget or by different parent widgets.

class MyDemo extends StatelessWidget {
  final List<Tab> myTabs = <Tab>[
    Tab(text: 'LEFT'),
    Tab(text: 'RIGHT'),

  Widget build(BuildContext context) {
    return DefaultTabController(
      length: myTabs.length,
      child: Scaffold(
        appBar: AppBar(
          bottom: TabBar(
            tabs: myTabs,
        body: TabBarView(
          children: tab) {
            final String label = tab.text.toLowerCase();
            return Center(
              child: Text(
                'This is the $label tab',
                style: const TextStyle(fontSize: 36),


DefaultTabController({Key? key, required int length, int initialIndex = 0, required Widget child})
Creates a default tab controller for the given child widget. [...]


child Widget
The widget below this widget in the tree. [...]
hashCode int
The hash code for this object. [...]
@nonVirtual, read-only, inherited
initialIndex int
The initial index of the selected tab. [...]
key Key?
Controls how one widget replaces another widget in the tree. [...]
final, inherited
length int
The total number of tabs. [...]
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited


createElement() StatefulElement
Creates a StatefulElement to manage this widget's location in the tree. [...]
createState() State<DefaultTabController>
Creates the mutable state for this widget at a given location in the tree. [...]
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. [...]
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep. [...]
toString({DiagnosticLevel minLevel =}) String
A string representation of this object. [...]
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) String
Returns a string representation of this node and its descendants. [...]
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) String
Returns a one-line detailed description of the object. [...]
toStringShort() String
A short, textual description of this widget.


operator ==(Object other) bool
The equality operator. [...]
@nonVirtual, inherited

Static Methods

of(BuildContext context) TabController?
The closest instance of this class that encloses the given context. [...]