Assign object to any widget in Flutter - flutter

Question

Good afternoon.
Do you know if there is in Flutter something similar to the .NET Tag property or the Qt setProperty property? Basically I want to be able to assign an object, string... to any widget in Flutter.
Thank you very much.

Answer 1

A basic example, as a followup to the comments:
enum DataType {
text,
number,
date,
time,
dateTime,
boolean,
}
class FieldData<T> {
final String table;
final DataType type;
final T value;
FieldData({
required this.table,
required this.type,
required this.value,
});
}
class SpecialTextField extends StatelessWidget {
const SpecialTextField({
Key? key,
required this.table,
required this.type,
required this.onChanged,
this.controller,
this.decoration,
}) : super(key: key);
final String table;
final DataType type;
final Function(FieldData) onChanged;
// Here you declare TextField's properties you need
// to use in your widget, and then pass them to TextField
final TextEditingController? controller;
final InputDecoration? decoration;
#override
Widget build(BuildContext context) {
return TextField(
controller: controller,
decoration: decoration,
onChanged: (value) => onChanged(
FieldData(
table: table,
type: type,
value: value,
),
),
);
}
}
And to use it, you can do:
SpecialTextField(
table: 'users',
type: DataType.text,
onChanged: (data) {
print('Table: ${data.table}');
print('Type: ${data.type.name}');
print('Value: ${data.value}');
},
)

Answer 2

I have found a solution that I like better. It is the Extension methods, a way to add functionalities to a library knowing nothing about its internal implementation. An example in my case:
extension myWidget on Widget {
static Object _data = Object();
Object get tag => _data;
set tag(Object tag) {
_data = tag;
}
}
Widget setTag(Widget wdg, Object tag) {
wdg.tag = tag;
return wdg;
}
Usage:
Container(
width: 500,
child: setTag(
TextField(
obscureText: false,
decoration: const InputDecoration(
border: OutlineInputBorder(),
labelText: 'Nº Historia Clínica',
),
),
"###AUTOCAMPO###|HJ_07_RADIODIAGNOSTICO|HOJA_REFERENCIA|ENTEROTEXTO"
)