feat(mobile): open ACTION_VIEW fallback in AssetViewer

drop ExternalMediaViewer route

mobile/lib/presentation/pages/external_media_viewer.page.dart

@@ -1,39 +0,0 @@
-import 'dart:io';
-
-import 'package:auto_route/auto_route.dart';
-import 'package:flutter/material.dart';
-import 'package:immich_mobile/models/view_intent/view_intent_attachment.model.dart';
-import 'package:immich_mobile/widgets/photo_view/photo_view.dart';
-
-@RoutePage()
-class ExternalMediaViewerPage extends StatelessWidget {
-  const ExternalMediaViewerPage({super.key, required this.attachment});
-
-  final ViewIntentAttachment attachment;
-
-  @override
-  Widget build(BuildContext context) {
-    final file = File(attachment.path);
-
-    return Scaffold(
-      backgroundColor: Colors.black,
-      appBar: AppBar(
-        backgroundColor: Colors.black,
-        foregroundColor: Colors.white,
-        title: Text(attachment.fileName, overflow: TextOverflow.ellipsis),
-      ),
-      body: Center(
-        child: attachment.isImage
-            ? PhotoView(
-                index: 0,
-                imageProvider: FileImage(file),
-                backgroundDecoration: const BoxDecoration(color: Colors.black),
-              )
-            : AspectRatio(
-                aspectRatio: 16 / 9,
-                child: Center(child: Icon(Icons.videocam, size: 64, color: Colors.white.withValues(alpha: 0.8))),
-              ),
-      ),
-    );
-  }
-}

mobile/lib/providers/asset_viewer/view_intent_handler.provider.dart

@@ -76,7 +76,6 @@ class ViewIntentHandler {
             await _localAssetRepository.updateHashes({localAssetId: checksum});
           }
         }
-        //todo clarify logic for assets not presented into MainTimeline (locked folder, deleted etc)
         final timelineMatch = await _openFromMainTimeline(localAssetId, checksum: checksum);
         if (timelineMatch) {
           return;
@@ -86,7 +85,8 @@ class ViewIntentHandler {
       }
     }
 
-    await _router.push(ExternalMediaViewerRoute(attachment: attachment));
+    final fallbackAsset = _toViewIntentAsset(attachment);
+    _openAssetViewer(fallbackAsset, _timelineFactory.fromAssets([fallbackAsset], TimelineOrigin.deepLink), 0);
   }
 
   Future<bool> _openFromMainTimeline(String localAssetId, {String? checksum}) async {
@@ -152,4 +152,18 @@ class ViewIntentHandler {
       return null;
     }
   }
+
+  LocalAsset _toViewIntentAsset(ViewIntentAttachment attachment) {
+    final now = DateTime.now();
+
+    return LocalAsset(
+      id: attachment.path,
+      name: attachment.fileName,
+      checksum: null,
+      type: attachment.isVideo ? AssetType.video : AssetType.image,
+      createdAt: now,
+      updatedAt: now,
+      isEdited: false,
+    );
+  }
 }

mobile/lib/routing/router.dart

@@ -16,7 +16,6 @@ import 'package:immich_mobile/models/memories/memory.model.dart';
 import 'package:immich_mobile/models/search/search_filter.model.dart';
 import 'package:immich_mobile/models/shared_link/shared_link.model.dart';
 import 'package:immich_mobile/models/upload/share_intent_attachment.model.dart';
-import 'package:immich_mobile/models/view_intent/view_intent_attachment.model.dart';
 import 'package:immich_mobile/pages/album/album_additional_shared_user_selection.page.dart';
 import 'package:immich_mobile/pages/album/album_asset_selection.page.dart';
 import 'package:immich_mobile/pages/album/album_options.page.dart';
@@ -105,7 +104,6 @@ import 'package:immich_mobile/presentation/pages/drift_place_detail.page.dart';
 import 'package:immich_mobile/presentation/pages/drift_recently_taken.page.dart';
 import 'package:immich_mobile/presentation/pages/drift_remote_album.page.dart';
 import 'package:immich_mobile/presentation/pages/drift_trash.page.dart';
-import 'package:immich_mobile/presentation/pages/external_media_viewer.page.dart';
 import 'package:immich_mobile/presentation/pages/drift_user_selection.page.dart';
 import 'package:immich_mobile/presentation/pages/drift_video.page.dart';
 import 'package:immich_mobile/presentation/pages/editing/drift_crop.page.dart';
@@ -342,7 +340,6 @@ class AppRouter extends RootStackRouter {
     AutoRoute(page: DownloadInfoRoute.page, guards: [_authGuard, _duplicateGuard]),
     AutoRoute(page: ImmichUIShowcaseRoute.page, guards: [_authGuard, _duplicateGuard]),
     AutoRoute(page: CleanupPreviewRoute.page, guards: [_authGuard, _duplicateGuard]),
-    AutoRoute(page: ExternalMediaViewerRoute.page, guards: [_authGuard, _duplicateGuard]),
     // required to handle all deeplinks in deep_link.service.dart
     // auto_route_library#1722
     RedirectRoute(path: '*', redirectTo: '/'),

mobile/lib/routing/router.gr.dart

@@ -1653,47 +1653,6 @@ class EditImageRouteArgs {
   }
 }
 
-/// generated route for
-/// [ExternalMediaViewerPage]
-class ExternalMediaViewerRoute
-    extends PageRouteInfo<ExternalMediaViewerRouteArgs> {
-  ExternalMediaViewerRoute({
-    Key? key,
-    required ViewIntentAttachment attachment,
-    List<PageRouteInfo>? children,
-  }) : super(
-         ExternalMediaViewerRoute.name,
-         args: ExternalMediaViewerRouteArgs(key: key, attachment: attachment),
-         initialChildren: children,
-       );
-
-  static const String name = 'ExternalMediaViewerRoute';
-
-  static PageInfo page = PageInfo(
-    name,
-    builder: (data) {
-      final args = data.argsAs<ExternalMediaViewerRouteArgs>();
-      return ExternalMediaViewerPage(
-        key: args.key,
-        attachment: args.attachment,
-      );
-    },
-  );
-}
-
-class ExternalMediaViewerRouteArgs {
-  const ExternalMediaViewerRouteArgs({this.key, required this.attachment});
-
-  final Key? key;
-
-  final ViewIntentAttachment attachment;
-
-  @override
-  String toString() {
-    return 'ExternalMediaViewerRouteArgs{key: $key, attachment: $attachment}';
-  }
-}
-
 /// generated route for
 /// [FailedBackupStatusPage]
 class FailedBackupStatusRoute extends PageRouteInfo<void> {