refactor: Make more files null safe

lib/pages/archive/archive.dart

@@ -1,3 +1,5 @@
+//@dart=2.12
+
 import 'package:flutter/material.dart';
 
 import 'package:adaptive_dialog/adaptive_dialog.dart';
@@ -9,30 +11,33 @@ import 'package:fluffychat/pages/archive/archive_view.dart';
 import 'package:fluffychat/widgets/matrix.dart';
 
 class Archive extends StatefulWidget {
-  const Archive({Key key}) : super(key: key);
+  const Archive({Key? key}) : super(key: key);
 
   @override
   ArchiveController createState() => ArchiveController();
 }
 
 class ArchiveController extends State<Archive> {
-  List<Room> archive;
+  List<Room>? archive;
 
   Future<List<Room>> getArchive(BuildContext context) async {
+    final archive = this.archive;
     if (archive != null) return archive;
     return await Matrix.of(context).client.loadArchive();
   }
 
-  void forgetAction(int i) => setState(() => archive.removeAt(i));
+  void forgetAction(int i) => setState(() => archive?.removeAt(i));
 
   void forgetAllAction() async {
+    final archive = this.archive;
+    if (archive == null) return;
     if (await showOkCancelAlertDialog(
           useRootNavigator: false,
           context: context,
-          title: L10n.of(context).areYouSure,
+          title: L10n.of(context)!.areYouSure,
-          okLabel: L10n.of(context).yes,
+          okLabel: L10n.of(context)!.yes,
-          cancelLabel: L10n.of(context).cancel,
+          cancelLabel: L10n.of(context)!.cancel,
-          message: L10n.of(context).clearArchive,
+          message: L10n.of(context)!.clearArchive,
         ) !=
         OkCancelResult.ok) {
       return;
@@ -47,7 +52,7 @@ class ArchiveController extends State<Archive> {
         }
       },
     );
-    setState(() => null);
+    setState(() {});
   }
 
   @override

lib/pages/archive/archive_view.dart

@@ -1,3 +1,5 @@
+//@dart=2.12
+
 import 'package:flutter/material.dart';
 
 import 'package:flutter_gen/gen_l10n/l10n.dart';
@@ -9,23 +11,22 @@ import 'package:fluffychat/pages/chat_list/chat_list_item.dart';
 class ArchiveView extends StatelessWidget {
   final ArchiveController controller;
 
-  const ArchiveView(this.controller, {Key key}) : super(key: key);
+  const ArchiveView(this.controller, {Key? key}) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
+    var archive = controller.archive;
     return FutureBuilder<List<Room>>(
       future: controller.getArchive(context),
       builder: (BuildContext context, snapshot) => Scaffold(
         appBar: AppBar(
           leading: const BackButton(),
-          title: Text(L10n.of(context).archive),
+          title: Text(L10n.of(context)!.archive),
           actions: [
-            if (snapshot.hasData &&
+            if (snapshot.hasData && archive != null && archive!.isNotEmpty)
-                controller.archive != null &&
-                controller.archive.isNotEmpty)
               TextButton(
                 onPressed: controller.forgetAllAction,
-                child: Text(L10n.of(context).clearArchive),
+                child: Text(L10n.of(context)!.clearArchive),
               )
           ],
         ),
@@ -34,7 +35,7 @@ class ArchiveView extends StatelessWidget {
             if (snapshot.hasError) {
               return Center(
                   child: Text(
-                L10n.of(context).oopsSomethingWentWrong,
+                L10n.of(context)!.oopsSomethingWentWrong,
                 textAlign: TextAlign.center,
               ));
             }
@@ -42,15 +43,15 @@ class ArchiveView extends StatelessWidget {
               return const Center(
                   child: CircularProgressIndicator.adaptive(strokeWidth: 2));
             } else {
-              controller.archive = snapshot.data;
+              archive = snapshot.data;
-              if (controller.archive.isEmpty) {
+              if (archive == null || archive!.isEmpty) {
                 return const Center(
                     child: Icon(Icons.archive_outlined, size: 80));
               }
               return ListView.builder(
-                itemCount: controller.archive.length,
+                itemCount: archive!.length,
                 itemBuilder: (BuildContext context, int i) => ChatListItem(
-                  controller.archive[i],
+                  archive![i],
                   onForget: controller.forgetAction,
                 ),
               );

lib/pages/chat/chat_app_bar_title.dart

@@ -1,3 +1,5 @@
+//@dart=2.12
+
 import 'package:flutter/material.dart';
 
 import 'package:flutter_gen/gen_l10n/l10n.dart';
@@ -13,35 +15,35 @@ import 'package:fluffychat/widgets/matrix.dart';
 
 class ChatAppBarTitle extends StatelessWidget {
   final ChatController controller;
-  const ChatAppBarTitle(this.controller, {Key key}) : super(key: key);
+  const ChatAppBarTitle(this.controller, {Key? key}) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
     if (controller.selectedEvents.isNotEmpty) {
       return Text(controller.selectedEvents.length.toString());
     }
+    final directChatMatrixID = controller.room.directChatMatrixID;
     return ListTile(
       leading: Avatar(
         mxContent: controller.room.avatar,
         name: controller.room.displayname,
       ),
       contentPadding: EdgeInsets.zero,
-      onTap: controller.room.isDirectChat
+      onTap: directChatMatrixID != null
           ? () => showModalBottomSheet(
                 context: context,
                 builder: (c) => UserBottomSheet(
-                  user: controller.room
+                  user: controller.room.getUserByMXIDSync(directChatMatrixID),
-                      .getUserByMXIDSync(controller.room.directChatMatrixID),
                   outerContext: context,
                   onMention: () => controller.sendController.text +=
-                      '${controller.room.getUserByMXIDSync(controller.room.directChatMatrixID).mention} ',
+                      '${controller.room.getUserByMXIDSync(directChatMatrixID).mention} ',
                 ),
               )
           : () => VRouter.of(context)
               .toSegments(['rooms', controller.room.id, 'details']),
       title: Text(
           controller.room
-              .getLocalizedDisplayname(MatrixLocals(L10n.of(context))),
+              .getLocalizedDisplayname(MatrixLocals(L10n.of(context)!)),
           maxLines: 1),
       subtitle: StreamBuilder<Object>(
         stream: Matrix.of(context)

lib/pages/chat/chat_emoji_picker.dart

@@ -1,3 +1,5 @@
+//@dart=2.12
+
 import 'package:flutter/material.dart';
 
 import 'package:emoji_picker_flutter/emoji_picker_flutter.dart';
@@ -6,7 +8,7 @@ import 'chat.dart';
 
 class ChatEmojiPicker extends StatelessWidget {
   final ChatController controller;
-  const ChatEmojiPicker(this.controller, {Key key}) : super(key: key);
+  const ChatEmojiPicker(this.controller, {Key? key}) : super(key: key);
 
   @override
   Widget build(BuildContext context) {

lib/pages/chat/command_hints.dart

@@ -1,3 +1,4 @@
+//@dart=2.12
 // This file is auto-generated using scripts/generate_command_hints_glue.sh.
 
 import 'package:flutter_gen/gen_l10n/l10n.dart';