Dart APIunself_componentCardTextEditinitialText initialText property Null safety String? initialText final Implementation final String? initialText; unself_component unself_component CardTextEdit initialText property CardTextEdit class Constructors CardTextEdit Properties autoFocus hashCode initialText key onChanged onTap runtimeType Methods createElement createState debugDescribeChildren debugFillProperties noSuchMethod toDiagnosticsNode toString toStringDeep toStringShallow toStringShort Operators operator ==