Dart APIunself_componentCardTiletrailing trailing property Null safety Widget? trailing final Implementation final Widget? trailing; unself_component unself_component CardTile trailing property CardTile class Constructors CardTile Properties description emoji hashCode key onTap runtimeType title trailing Methods build createElement debugDescribeChildren debugFillProperties noSuchMethod toDiagnosticsNode toString toStringDeep toStringShallow toStringShort Operators operator ==