Flutter - Make custom text editing controller

Question

I want to make a custom text editing controller which will show the numbers of text in Farsi (Persian), but returns it with English numbers when you call textEditingController.text.

Here's what I have implemented but it seems like the TextField doesn't use the setter of text:

class PersianTextEditingController extends TextEditingController {

  @override
  String get text => value.text.toEnglishNumbers;

  @override
  set text(String newText) {
    value = value.copyWith(
      text: newText.toPersianNumbers,
      selection: const TextSelection.collapsed(offset: -1),
      composing: TextRange.empty,
    );
  }

  factory PersianTextEditingController({String? text}) =>
      PersianTextEditingController._(text: text);

  PersianTextEditingController._({String? text}) {
    this.text = text ?? '';
  }

}

Here's the TextField:

PersianTextEditingController controller = PersianTextEditingController();
@override
    Widget build(BuildContext context) {
        return TextField(
          controller: widget.controller,
        );
      }

Answer 1

The reason your code doesn't work is that you try to get english number with getter text, inside the TextEditingController its use it, so always you are getting english number, you need to set text to farsi and define new getter for english number, like this:

class PersianTextEditingController extends TextEditingController {
  @override
  String get text => value.text.toPersianNumbers;

  String get englishText => value.text.toEnglishNumbers;

  factory PersianTextEditingController({String? text}) =>
      PersianTextEditingController._(text: text);

  PersianTextEditingController._({String? text}) {
    this.text = text ?? '';
  }
}

but when you want to get your english number use this:

print("text = ${widget.controller.englishText}")