h-1.flutter.4/lib/widgets/master_edit_fields.dart

// Version: 1.0 - 汎用マスタ編集フィールド（Flutter 標準）
import 'package:flutter/material.dart';

/// マスタ編集用の統一 TextField
class MasterTextField extends StatelessWidget {
  final String label;
  final TextEditingController controller;
  final String? hint;
  final TextInputType keyboardType;
  final bool obscureText;
  final int maxLines;
  final TextInputAction textInputAction;
  final FormFieldValidator<String>? validator;
  // TextEditingController を直接使うため、onChanged は不要。nullable の形に定義する
  final void Function(String)? onChanged;

  const MasterTextField({
    super.key,
    required this.label,
    required this.controller,
    this.hint,
    this.keyboardType = TextInputType.text,
    this.obscureText = false,
    this.maxLines = 1,
    this.textInputAction = TextInputAction.next,
    this.validator,
    this.onChanged,
  });

  @override
  Widget build(BuildContext context) {
    return TextFormField(
      controller: controller,
      decoration: InputDecoration(
        labelText: label,
        hintText: hint,
        border: OutlineInputBorder(borderRadius: BorderRadius.circular(8)),
        contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
      ),
      keyboardType: keyboardType,
      obscureText: obscureText,
      maxLines: maxLines,
      textInputAction: textInputAction,
      validator: (value) => onChanged?.call(value) ?? validator?.call(value),
      onChanged: onChanged,
    );
  }
}

/// マスタ編集用の数値入力 TextField
class MasterNumberField extends StatelessWidget {
  final String label;
  final TextEditingController controller;
  final String? hint;
  final FormFieldValidator<String>? validator;
  // Nullable の形で定義
  final void Function(String)? onChanged;

  const MasterNumberField({
    super.key,
    required this.label,
    required this.controller,
    this.hint,
    this.validator,
    this.onChanged,
  });

  @override
  Widget build(BuildContext context) {
    return TextFormField(
      controller: controller,
      decoration: InputDecoration(
        labelText: label,
        hintText: hint,
        border: OutlineInputBorder(borderRadius: BorderRadius.circular(8)),
        contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
      ),
      keyboardType: TextInputType.number,
      validator: (value) => onChanged?.call(value) ?? validator?.call(value),
      onChanged: onChanged,
    );
  }
}

/// ドロップダウンフィールド
class MasterDropdownField<T> extends StatelessWidget {
  final String label;
  final TextEditingController controller;
  final T? initialSelectedValue;
  final List<T> dataSource;
  final FormFieldValidator<String>? validator;
  // DropdownButtonFormField の onChanged は void Function(T)? を要求
  final void Function(T)? onChanged;

  const MasterDropdownField({
    super.key,
    required this.label,
    required this.controller,
    this.initialSelectedValue,
    required this.dataSource,
    this.validator,
    this.onChanged,
  });

  @override
  Widget build(BuildContext context) {
    final items = dataSource.map((value) => DropdownMenuItem<T>(
      value: value,
      child: Text(value.toString()),
    )).toList();

    return DropdownButtonFormField<T>(
      decoration: InputDecoration(
        labelText: label,
        hintText: '選択してください',
        border: OutlineInputBorder(borderRadius: BorderRadius.circular(8)),
        contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
      ),
      value: initialSelectedValue != null ? initialSelectedValue : null,
      items: items,
      onChanged: onChanged,
    );
  }
}

/// テキストエリアフィールド（長文章用）
class MasterTextArea extends StatelessWidget {
  final String label;
  final TextEditingController controller;
  final String? hint;
  final FormFieldValidator<String>? validator;
  // Nullable の形で定義
  final void Function(String)? onChanged;
  final bool readOnly;

  const MasterTextArea({
    super.key,
    required this.label,
    required this.controller,
    this.hint,
    this.validator,
    this.onChanged,
    this.readOnly = false,
  });

  @override
  Widget build(BuildContext context) {
    return TextFormField(
      controller: controller,
      decoration: InputDecoration(
        labelText: label,
        hintText: hint,
        border: OutlineInputBorder(borderRadius: BorderRadius.circular(8)),
        contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
      ),
      maxLines: 4,
      readOnly: readOnly,
      validator: (value) => onChanged?.call(value) ?? validator?.call(value),
      onChanged: onChanged,
    );
  }
}

/// チェックボックスフィールド（フラグ用）
class MasterCheckBox extends StatelessWidget {
  final String label;
  final bool initialValue;
  final FormFieldValidator<bool>? validator;
  // SwitchListTile の onChanged は void Function(bool)? を要求
  // Validator とコールバックを分離する形に
  final VoidCallback? onCheckedCallback;

  const MasterCheckBox({
    super.key,
    required this.label,
    required this.initialValue,
    this.validator,
    this.onCheckedCallback,
  });

  @override
  Widget build(BuildContext context) {
    return SwitchListTile(
      title: Text(label),
      subtitle: initialValue ? const Text('有効') : const Text('無効'),
      value: initialValue,
      onChanged: (value) {
        if (validator?.call(value) != null) {
          ScaffoldMessenger.of(context).showSnackBar(
            SnackBar(content: Text(validator!.call(value) ?? ''), backgroundColor: Colors.red),
          );
        } else if (onCheckedCallback?.call() ?? false) {
          onCheckedCallback?.call();
        }
      },
    );
  }
}