Question 76622 in Flutter Question posted in
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Assign object to any widget in Flutter

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.

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2

Answers


  1. Chosen as BEST ANSWER
    0

    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"
          )

  2. 0

    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}');
  },
)
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