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Yes, there is a way to determine if a TextField has exceeded its size limit. You can use the TextEditingController class to listen for changes to the text in the TextField. Then, you can check the length of the text against the maximum length allowed for the TextField. Here is an example:

final TextEditingController _controller = TextEditingController();
final int maxLength = 10;

@override
Widget build(BuildContext context) {
  return TextField(
    controller: _controller,
    maxLength: maxLength,
    onChanged: (text) {
      if (text.length >= maxLength) {
        // Do something when the text exceeds the maximum length
      }
    },
  );
}

To implement autoresizing of a TextField, you can use the AutoDirection widget from the auto_direction package. This widget automatically adjusts the width and height of a TextField based on the length of the text. Here is an example:

import 'package:auto_direction/auto_direction.dart';

final TextEditingController _controller = TextEditingController();

@override
Widget build(BuildContext context) {
  return AutoDirection(
    text: _controller.text,
    child: TextField(
      controller: _controller,
      expands: true,
      maxLines: null,
    ),
  );
}

In this example, the expands and maxLines properties of the TextField are set to allow the widget to resize vertically. The AutoDirection widget uses the length and direction of the text to calculate the correct width of the TextField.