Extract work tile from recording editor

lib/widgets/work_tile.dart

@@ -0,0 +1,47 @@
+import 'package:flutter/material.dart';
+
+import '../backend.dart';
+import '../database.dart';
+
+class WorkTile extends StatelessWidget {
+  final int workId;
+  final void Function() onTap;
+
+  WorkTile({
+    this.workId,
+    this.onTap,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final backend = Backend.of(context);
+
+    return StreamBuilder<Work>(
+      stream: backend.db.workById(workId).watchSingle(),
+      builder: (context, snapshot) {
+        final titleText = snapshot.data?.title ?? '...';
+
+        return StreamBuilder<List<Person>>(
+          stream: backend.db.composersByWork(workId).watch(),
+          builder: (context, snapshot) {
+            if (snapshot.hasData) {
+              return ListTile(
+                title: Text(titleText),
+                subtitle: Text(snapshot.data
+                    .map((p) => '${p.firstName} ${p.lastName}')
+                    .join(', ')),
+                onTap: onTap ?? null,
+              );
+            } else {
+              return ListTile(
+                title: Text(titleText),
+                subtitle: Text('...'),
+                onTap: onTap ?? null,
+              );
+            }
+          },
+        );
+      },
+    );
+  }
+}