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'),
  ];

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

Constructors

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

Properties

animationDuration → Duration?
Controls the duration of DefaultTabController and TabBarView animations.
final
child → Widget
The widget below this widget in the tree.
final
hashCode → int
The hash code for this object.
nonVirtual">@nonVirtualread-onlyinherited
initialIndex → int
The initial index of the selected tab.
final
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
length → int
The total number of tabs.
final
runtimeType → Type
A representation of the runtime type of the object.
read-onlyinherited

Methods

createElement() → StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<DefaultTabController>
Creates the mutable state for this widget at a given location in the tree.
override
debugDescribeChildren() → List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children.
protected">@protectedinherited
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">@nonVirtualinherited

Static Methods

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