ExpansionPanelRadio class Null safety

An expansion panel that allows for radio-like functionality. This means that at any given time, at most, one ExpansionPanelRadio can remain expanded.

A unique identifier value must be assigned to each panel. This identifier allows the ExpansionPanelList to determine which ExpansionPanelRadio instance should be expanded.

See ExpansionPanelList.radio for a sample implementation.



ExpansionPanelRadio({required Object value, required ExpansionPanelHeaderBuilder headerBuilder, required Widget body, bool canTapOnHeader = false, Color? backgroundColor})
An expansion panel that allows for radio functionality.


backgroundColor Color?
Defines the background color of the panel.
final, inherited
body Widget
The body of the expansion panel that's displayed below the header.
final, inherited
canTapOnHeader bool
Whether tapping on the panel's header will expand/collapse it.
final, inherited
hashCode int
The hash code for this object.
read-only, inherited
headerBuilder ExpansionPanelHeaderBuilder
The widget builder that builds the expansion panels' header.
final, inherited
isExpanded bool
Whether the panel is expanded.
final, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
value Object
The value that uniquely identifies a radio panel so that the currently selected radio panel can be identified.


noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
toString() String
A string representation of this object.


operator ==(Object other) bool
The equality operator.