From 14d7ef0101400f531092ee4abfc42e9a0dfd218e Mon Sep 17 00:00:00 2001
From: xengineering <me@xengineering.eu>
Date: Mon, 5 Jan 2026 14:08:11 +0100
Subject: Split code into three Dart files

This follows recommendations [1] from the flutter documentation.

[1]: https://docs.flutter.dev/app-architecture/concepts
---
 lib/data.dart |  6 ++++
 lib/main.dart | 89 ++---------------------------------------------------------
 lib/ui.dart   | 83 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 91 insertions(+), 87 deletions(-)
 create mode 100644 lib/data.dart
 create mode 100644 lib/ui.dart

diff --git a/lib/data.dart b/lib/data.dart
new file mode 100644
index 0000000..f2e3531
--- /dev/null
+++ b/lib/data.dart
@@ -0,0 +1,6 @@
+class Contact {
+  final String address;
+  bool isOpen;
+
+  Contact({required this.address, required this.isOpen});
+}
diff --git a/lib/main.dart b/lib/main.dart
index fd48c14..805ef69 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -1,92 +1,7 @@
-import 'dart:async';
-
 import 'package:flutter/material.dart';
 
+import 'ui.dart';
+
 void main() {
   runApp(const UI());
 }
-
-class UI extends StatelessWidget {
-  const UI({super.key});
-
-  @override
-  Widget build(BuildContext context) {
-    return const MaterialApp(
-      home: ContactList(),
-    );
-  }
-}
-
-class Contact {
-  final String address;
-  bool isOpen;
-
-  Contact({required this.address, required this.isOpen});
-}
-
-class ContactList extends StatefulWidget {
-  const ContactList({super.key});
-
-  @override
-  State<ContactList> createState() => _ContactListState();
-}
-
-class _ContactListState extends State<ContactList> {
-  late final List<Contact> contacts;
-  Timer? _timer;
-
-  @override
-  void initState() {
-    super.initState();
-
-    contacts = <Contact>[
-      Contact(address: "Living Room Window", isOpen: false),
-      Contact(address: "Front Door", isOpen: true),
-      Contact(address: "Back Door", isOpen: false),
-      Contact(address: "Garage Window", isOpen: true),
-    ];
-
-    _timer = Timer.periodic(const Duration(seconds: 1), (_) {
-      setState(() {
-        contacts[0].isOpen = !contacts[0].isOpen;
-      });
-    });
-  }
-
-  @override
-  void dispose() {
-    _timer?.cancel();
-    super.dispose();
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    return Scaffold(
-      appBar: AppBar(title: const Text("Contacts")),
-      body: ListView.builder(
-        itemCount: contacts.length,
-        itemBuilder: (BuildContext context, int index) {
-          final Contact contact = contacts[index];
-          return ContactTile(contact: contact);
-        },
-      ),
-    );
-  }
-}
-
-class ContactTile extends StatelessWidget {
-  final Contact contact;
-
-  const ContactTile({super.key, required this.contact});
-
-  @override
-  Widget build(BuildContext context) {
-    return ListTile(
-      leading: Icon(
-        contact.isOpen ? Icons.meeting_room : Icons.door_front_door,
-        color: contact.isOpen ? Colors.red : Colors.green,
-      ),
-      title: Text(contact.address),
-    );
-  }
-}
diff --git a/lib/ui.dart b/lib/ui.dart
new file mode 100644
index 0000000..5397044
--- /dev/null
+++ b/lib/ui.dart
@@ -0,0 +1,83 @@
+import 'dart:async';
+
+import 'package:flutter/material.dart';
+
+import 'data.dart';
+
+class UI extends StatelessWidget {
+  const UI({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const MaterialApp(
+      home: ContactList(),
+    );
+  }
+}
+
+class ContactList extends StatefulWidget {
+  const ContactList({super.key});
+
+  @override
+  State<ContactList> createState() => _ContactListState();
+}
+
+class _ContactListState extends State<ContactList> {
+  late final List<Contact> contacts;
+  Timer? _timer;
+
+  @override
+  void initState() {
+    super.initState();
+
+    contacts = <Contact>[
+      Contact(address: "Living Room Window", isOpen: false),
+      Contact(address: "Front Door", isOpen: true),
+      Contact(address: "Back Door", isOpen: false),
+      Contact(address: "Garage Window", isOpen: true),
+    ];
+
+    _timer = Timer.periodic(const Duration(seconds: 1), (_) {
+      setState(() {
+        contacts[0].isOpen = !contacts[0].isOpen;
+      });
+    });
+  }
+
+  @override
+  void dispose() {
+    _timer?.cancel();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text("Contacts")),
+      body: ListView.builder(
+        itemCount: contacts.length,
+        itemBuilder: (BuildContext context, int index) {
+          final Contact contact = contacts[index];
+          return ContactTile(contact: contact);
+        },
+      ),
+    );
+  }
+}
+
+class ContactTile extends StatelessWidget {
+  final Contact contact;
+
+  const ContactTile({super.key, required this.contact});
+
+  @override
+  Widget build(BuildContext context) {
+    return ListTile(
+      leading: Icon(
+        contact.isOpen ? Icons.meeting_room : Icons.door_front_door,
+        color: contact.isOpen ? Colors.red : Colors.green,
+      ),
+      title: Text(contact.address),
+    );
+  }
+}
-- 
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