musicus_mobile/musicus/lib/selectors/person.dart

import 'package:flutter/material.dart';

import '../backend.dart';
import '../database.dart';
import '../editors/person.dart';

class PersonsSelector extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final backend = Backend.of(context);

    return Scaffold(
      appBar: AppBar(
        title: Text('Select person'),
      ),
      body: StreamBuilder(
        stream: backend.db.allPersons().watch(),
        builder: (context, snapshot) {
          if (snapshot.hasData) {
            return ListView.builder(
              itemCount: snapshot.data.length,
              itemBuilder: (context, index) {
                final person = snapshot.data[index];

                return ListTile(
                  title: Text('${person.lastName}, ${person.firstName}'),
                  onTap: () => Navigator.pop(context, person),
                );
              },
            );
          } else {
            return Container();
          }
        },
      ),
      floatingActionButton: FloatingActionButton(
        child: const Icon(Icons.add),
        onPressed: () async {
          final Person person = await Navigator.push(
              context,
              MaterialPageRoute(
                builder: (context) => PersonEditor(),
                fullscreenDialog: true,
              ));

          if (person != null) {
            Navigator.pop(context, person);
          }
        },
      ),
    );
  }
}