Rating bottom sheet

import 'package:flutter/material.dart';

class RatingResult {
  const RatingResult(this.stars, this.tags, this.comment);
  final int stars;
  final Set<String> tags;
  final String comment;
}

/// Returns null when the user dismisses the sheet.
Future<RatingResult?> showRatingSheet(BuildContext context,
    {List<String> tags = const ['On time', 'Polite', 'Great quality']}) {
  return showModalBottomSheet<RatingResult>(
    context: context,
    isScrollControlled: true, // lets the sheet rise above the keyboard
    showDragHandle: true,
    builder: (_) => _RatingSheet(tags: tags),
  );
}

class _RatingSheet extends StatefulWidget {
  const _RatingSheet({required this.tags});
  final List<String> tags;
  @override
  State<_RatingSheet> createState() => _RatingSheetState();
}

class _RatingSheetState extends State<_RatingSheet> {
  int _stars = 0;
  final _picked = <String>{};
  final _comment = TextEditingController();

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

  @override
  Widget build(BuildContext context) {
    final bottom = MediaQuery.of(context).viewInsets.bottom;
    return Padding(
      padding: EdgeInsets.fromLTRB(20, 0, 20, 20 + bottom),
      child: Column(mainAxisSize: MainAxisSize.min, children: [
        Text('How was it?', style: Theme.of(context).textTheme.titleLarge),
        Row(mainAxisAlignment: MainAxisAlignment.center, children: [
          for (var i = 1; i <= 5; i++)
            IconButton(
              tooltip: '$i stars',
              onPressed: () => setState(() => _stars = i),
              icon: Icon(i <= _stars ? Icons.star : Icons.star_border, size: 36, color: Colors.amber),
            ),
        ]),
        Wrap(spacing: 8, children: [
          for (final t in widget.tags)
            FilterChip(
              label: Text(t),
              selected: _picked.contains(t),
              onSelected: (on) => setState(() => on ? _picked.add(t) : _picked.remove(t)),
            ),
        ]),
        const SizedBox(height: 12),
        TextField(
          controller: _comment,
          maxLines: 3,
          maxLength: 300,
          decoration: const InputDecoration(hintText: 'Add a comment (optional)', border: OutlineInputBorder()),
        ),
        FilledButton(
          onPressed: _stars == 0
              ? null
              : () => Navigator.pop(context, RatingResult(_stars, _picked, _comment.text.trim())),
          child: const Text('Submit'),
        ),
      ]),
    );
  }
}