Dart APIunself_componentCardTextEditStateCardTextEditState constructor CardTextEditState constructor Null safety CardTextEditState() unself_component unself_component CardTextEditState CardTextEditState constructor CardTextEditState class Constructors CardTextEditState Properties context controller hashCode mounted runtimeType widget Methods activate build deactivate debugFillProperties didChangeDependencies didUpdateWidget dispose initState noSuchMethod reassemble setState toDiagnosticsNode toString toStringShort Operators operator ==