Show message when viewing room that the user left

lib/src/ui/main/chat/chat_bloc.dart

@@ -24,7 +24,7 @@ import 'package:pattle/src/di.dart' as di;
 
 class ChatBloc {
 
-  JoinedRoom room;
+  Room room;
 
   int _eventCount = 20;
 
@@ -125,8 +125,9 @@ class ChatBloc {
   }
 
   Future<void> sendMessage(String text) async {
+    final room = this.room;
     // TODO: Check if text is just whitespace
-    if (text.isNotEmpty) {
+    if (room is JoinedRoom && text.isNotEmpty) {
       // Refresh the list every time the sent state changes.
       await for (var sentState in room.send(TextMessage(body: text))) {
         await loadEvents();

lib/src/ui/main/chat/chat_page.dart

@@ -36,7 +36,7 @@ class ChatPageState extends State<ChatPage> {
 
   final me = di.getLocalUser();
   final ChatBloc bloc = ChatBloc();
-  final JoinedRoom room;
+  final Room room;
 
   ScrollController scrollController = ScrollController();
   double get scrollLoadRange => scrollController.position.maxScrollExtent - 700;
@@ -136,15 +136,17 @@ class ChatPageState extends State<ChatPage> {
   }
 
   Widget _buildInput() {
-    return Material(
-      elevation: 8,
-      color: LightColors.red[50],
-      child: Padding(
-        padding: EdgeInsets.symmetric(vertical: 8, horizontal: 16),
-        child: Material(
-          elevation: 8,
-          borderRadius: BorderRadius.circular(8),
-          child: TextField(
+    const elevation = 8.0;
+    if (bloc.room is JoinedRoom) {
+      return Material(
+        elevation: elevation,
+        color: LightColors.red[50],
+        child: Padding(
+          padding: EdgeInsets.symmetric(vertical: 8, horizontal: 16),
+          child: Material(
+            elevation: elevation,
+            borderRadius: BorderRadius.circular(8),
+            child: TextField(
             controller: textController,
             textInputAction: TextInputAction.newline,
             autocorrect: true,
@@ -163,11 +165,24 @@ class ChatPageState extends State<ChatPage> {
                   textController.clear();
                 }
               )
+              ),
             ),
+          )
+        )
+      );
+    } else {
+      return Material(
+        elevation: elevation,
+        color: Colors.white,
+        child: Padding(
+          padding: EdgeInsets.all(16),
+          child: Text(l(context).cantSendMessages,
+            textAlign: TextAlign.center,
           ),
         )
-      )
-    );
+      );
+    }
+
   }
 
   Widget _buildLoadingIndicator() {

lib/src/ui/resources/localizations.dart

@@ -44,6 +44,9 @@ class Strings {
   final groupName = 'Group name';
   final participants = 'Participants';
 
+  final cantSendMessages
+    = 'You can\'t send messages to this group because you\'re no longer a participant.';
+
   final connectionLost =
     'Connection has been lost.\n'
     'Make sure your phone has an active internet connection.';

pubspec.lock

@@ -215,14 +215,14 @@ packages:
       name: matrix_sdk
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.3"
+    version: "0.13.1"
   matrix_sdk_sqflite:
     dependency: "direct main"
     description:
       name: matrix_sdk_sqflite
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.8.0"
+    version: "0.9.0"
   meta:
     dependency: transitive
     description:

pubspec.yaml

@@ -12,8 +12,8 @@ dependencies:
 
   injector: ^1.0.6
 
-  matrix_sdk: ^0.12.3
-  matrix_sdk_sqflite: ^0.8.0
+  matrix_sdk: ^0.13.1
+  matrix_sdk_sqflite: ^0.9.0
 
   rxdart: ^0.21.0