Disabled if hidden, enabled vice versa

tapped_on_off.dart

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;
  int _counter2 = 0;
  bool _flg = false;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  void _incrementCounter2() {
    setState(() {
      _counter2++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Stack(
          children: <Widget>[
            AnimatedOpacity(
              opacity: _flg ? 1 : 0,
              duration: const Duration(milliseconds: 1),
              child: IgnorePointer(
                ignoring: _flg,
                child: TextButton(
                  onPressed: () {
                    _incrementCounter();
                    _flg = true;
                  },
                  child: Text(
                    '$_counter',
                    style: Theme.of(context).textTheme.headline4,
                  ),
                ),
              ),
            ),
            AnimatedOpacity(
              opacity: _flg ? 0 : 1,
              duration: const Duration(milliseconds: 1),
              child: IgnorePointer(
                ignoring: !_flg,
                child: TextButton(
                  onPressed: () {
                    _incrementCounter2();
                    _flg = false;
                  },
                  child: Text(
                    '${_counter2}2',
                    style: Theme.of(context).textTheme.headline4,
                  ),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}

Example