Switch to Map address to state for contacts

This map should be empty in the future and updated based on the incoming
MQTT messages.

A list was not the correct data structure for that since it requires to
iterate over the whole list to find the entry with a certain address.
But this is required to update the state of an already known contact.

1 files changed, 6 insertions, 4 deletions

diff --git a/lib/ui.dart b/lib/ui.dart
index d4618cf..4a513c6 100644
--- a/lib/ui.dart
+++ b/lib/ui.dart
@@ -26,13 +26,15 @@ class ContactList extends StatelessWidget {
           return ListView.builder(
             itemCount: state.contacts.length,
             itemBuilder: (BuildContext context, int index) {
-              final Contact contact = state.contacts[index];
+              MapEntry<String, bool> data = state.contacts.entries.elementAt(index);
+              String address = data.key;
+              bool isOpen = data.value;
               return ListTile(
                 leading: Icon(
-                  contact.isOpen ? Icons.meeting_room : Icons.door_front_door,
-                  color: contact.isOpen ? Colors.red : Colors.green,
+                  isOpen ? Icons.meeting_room : Icons.door_front_door,
+                  color: isOpen ? Colors.red : Colors.green,
                 ),
-                title: Text(contact.address),
+                title: Text(address),
               );
             },
           );