SimpleCloudNotifier/flutter/lib/pages/settings/settings_number_modal.dart

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

class SettingsNumberModal extends StatefulWidget {
  final String title;
  final int currentValue;
  final int minValue;
  final int maxValue;
  final ValueChanged<int> onValueChanged;

  const SettingsNumberModal({
    Key? key,
    required this.title,
    required this.currentValue,
    required this.minValue,
    required this.maxValue,
    required this.onValueChanged,
  }) : super(key: key);

  @override
  State<SettingsNumberModal> createState() => _SettingsNumberModalState();

  static Future<void> show(
    BuildContext context, {
    required String title,
    required int currentValue,
    required int minValue,
    required int maxValue,
    required ValueChanged<int> onValueChanged,
  }) {
    return showDialog(
      context: context,
      builder: (context) => SettingsNumberModal(
        title: title,
        currentValue: currentValue,
        minValue: minValue,
        maxValue: maxValue,
        onValueChanged: onValueChanged,
      ),
    );
  }
}

class _SettingsNumberModalState extends State<SettingsNumberModal> {
  late TextEditingController _controller;
  late int selectedValue;

  @override
  void initState() {
    super.initState();
    selectedValue = widget.currentValue;
    _controller = TextEditingController(text: widget.currentValue.toString());
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return AlertDialog(
      title: Text(widget.title),
      content: Column(
        mainAxisSize: MainAxisSize.min,
        children: [
          TextField(
            controller: _controller,
            keyboardType: TextInputType.number,
            decoration: InputDecoration(
              hintText: 'Enter a number',
              errorText: _validateInput(),
            ),
            inputFormatters: [FilteringTextInputFormatter.digitsOnly],
            onChanged: (value) {
              setState(() {
                selectedValue = int.tryParse(value) ?? widget.currentValue;
              });
            },
          ),
        ],
      ),
      actions: [
        TextButton(
          onPressed: () {
            Navigator.of(context).pop();
          },
          child: const Text('Cancel'),
        ),
        TextButton(
          onPressed: _validateInput() == null
              ? () {
                  widget.onValueChanged(selectedValue);
                  Navigator.of(context).pop();
                }
              : null,
          child: const Text('OK'),
        ),
      ],
    );
  }

  String? _validateInput() {
    final number = int.tryParse(_controller.text);
    if (number == null) {
      return 'Please enter a valid number';
    }
    if (number < widget.minValue) {
      return 'Value must be at least ${widget.minValue}';
    }
    if (number > widget.maxValue) {
      return 'Value must be at most ${widget.maxValue}';
    }
    return null;
  }
}