Dart APIunself_componentConditionalParentWidgetcondition condition property Null safety bool condition final Implementation final bool condition; unself_component unself_component ConditionalParentWidget condition property ConditionalParentWidget class Constructors ConditionalParentWidget Properties child condition conditionalBuilder hashCode key runtimeType Methods build createElement debugDescribeChildren debugFillProperties noSuchMethod toDiagnosticsNode toString toStringDeep toStringShallow toStringShort Operators operator ==