Dart APIsettings_listSettingsListSliveronSelectData onSelectData property Null safety VoidCallback onSelectData final Implementation final VoidCallback onSelectData; unself_settings_list settings_list SettingsListSliver onSelectData property SettingsListSliver class Constructors SettingsListSliver Properties children hashCode key onSelectAppearance onSelectData onSelectFeedback onSelectLicense onSelectPrivacy onSelectTerms runtimeType Methods build createElement debugDescribeChildren debugFillProperties noSuchMethod toDiagnosticsNode toString toStringDeep toStringShallow toStringShort Operators operator ==