ButtonBarTheme class Null safety

Applies a button bar theme to descendant ButtonBar widgets.

A button bar theme describes the layout and properties for the buttons contained in a ButtonBar.

Descendant widgets obtain the current theme's ButtonBarTheme object using ButtonBarTheme.of. When a widget uses ButtonBarTheme.of, it is automatically rebuilt if the theme later changes.

A button bar theme can be specified as part of the overall Material theme using ThemeData.buttonBarTheme.

See also:



ButtonBarTheme({Key? key, required ButtonBarThemeData data, required Widget child})
Constructs a button bar theme that configures all descendent ButtonBar widgets.


child Widget
The widget below this widget in the tree.
final, inherited
data ButtonBarThemeData
The properties used for all descendant ButtonBar widgets.
hashCode int
The hash code for this object.
@nonVirtual, 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


createElement() InheritedElement
Inflates this configuration to a concrete instance.
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 = DiagnosticLevel.info}) 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.
updateShouldNotify(covariant ButtonBarTheme oldWidget) bool
Whether the framework should notify widgets that inherit from this widget.


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

Static Methods

of(BuildContext context) ButtonBarThemeData
Returns the configuration data from the closest ButtonBarTheme ancestor. If there is no ancestor, it returns ThemeData.buttonBarTheme. Applications can assume that the returned value will not be null.