feat: Save files images and videos

lib/pages/chat/chat.dart

@@ -23,6 +23,7 @@ import 'package:fluffychat/config/app_config.dart';
 import 'package:fluffychat/pages/chat/chat_view.dart';
 import 'package:fluffychat/pages/chat/event_info_dialog.dart';
 import 'package:fluffychat/pages/chat/recording_dialog.dart';
+import 'package:fluffychat/utils/matrix_sdk_extensions.dart/event_extension.dart';
 import 'package:fluffychat/utils/matrix_sdk_extensions.dart/matrix_locals.dart';
 import 'package:fluffychat/utils/platform_infos.dart';
 import 'package:fluffychat/widgets/matrix.dart';
@@ -83,6 +84,18 @@ class ChatController extends State<Chat> {
     }
   }
 
+  bool get canSaveSelectedEvent =>
+      selectedEvents.length == 1 &&
+      {
+        MessageTypes.Video,
+        MessageTypes.Image,
+        MessageTypes.Sticker,
+        MessageTypes.Audio,
+        MessageTypes.File,
+      }.contains(selectedEvents.single.messageType);
+
+  void saveSelectedEvent() => selectedEvents.single.saveFile(context);
+
   List<Event> selectedEvents = [];
 
   List<Event> filteredEvents;

lib/pages/chat/chat_view.dart

@@ -49,6 +49,12 @@ class ChatView extends StatelessWidget {
             tooltip: L10n.of(context).copy,
             onPressed: controller.copyEventsAction,
           ),
+          if (controller.canSaveSelectedEvent)
+            IconButton(
+              icon: Icon(Icons.adaptive.share),
+              tooltip: L10n.of(context).share,
+              onPressed: controller.saveSelectedEvent,
+            ),
           if (controller.canRedactSelectedEvents)
             IconButton(
               icon: const Icon(Icons.delete_outlined),