fix: show "preparing" when sharing in beta timeline (#21390)

* fix: show "preparing" when sharing in beta timeline

* embed dialog inside of share_action_button

* dont await the share sheet so "preparing" dialog disappears once share sheet presents

this mimics old timeline behavior

* chore: lint

mobile/lib/presentation/widgets/action_buttons/share_action_button.widget.dart

@@ -1,15 +1,34 @@
 import 'dart:io';
 
+import 'package:easy_localization/easy_localization.dart';
 import 'package:flutter/material.dart';
 import 'package:fluttertoast/fluttertoast.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
 import 'package:immich_mobile/constants/enums.dart';
+import 'package:immich_mobile/extensions/build_context_extensions.dart';
 import 'package:immich_mobile/extensions/translate_extensions.dart';
 import 'package:immich_mobile/presentation/widgets/action_buttons/base_action_button.widget.dart';
 import 'package:immich_mobile/providers/infrastructure/action.provider.dart';
 import 'package:immich_mobile/providers/timeline/multiselect.provider.dart';
 import 'package:immich_mobile/widgets/common/immich_toast.dart';
 
+class _SharePreparingDialog extends StatelessWidget {
+  const _SharePreparingDialog();
+
+  @override
+  Widget build(BuildContext context) {
+    return AlertDialog(
+      content: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          const CircularProgressIndicator(),
+          Container(margin: const EdgeInsets.only(top: 12), child: const Text('share_dialog_preparing').tr()),
+        ],
+      ),
+    );
+  }
+}
+
 class ShareActionButton extends ConsumerWidget {
   final ActionSource source;
 
@@ -20,28 +39,34 @@ class ShareActionButton extends ConsumerWidget {
       return;
     }
 
-    final result = await ref.read(actionProvider.notifier).shareAssets(source);
-    ref.read(multiSelectProvider.notifier).reset();
+    showDialog(
+      context: context,
+      builder: (BuildContext buildContext) {
+        ref.read(actionProvider.notifier).shareAssets(source).then((ActionResult result) {
+          ref.read(multiSelectProvider.notifier).reset();
 
-    if (!context.mounted) {
-      return;
-    }
+          if (!context.mounted) {
+            return;
+          }
 
-    if (!result.success) {
-      ImmichToast.show(
-        context: context,
-        msg: 'scaffold_body_error_occurred'.t(context: context),
-        gravity: ToastGravity.BOTTOM,
-        toastType: ToastType.error,
-      );
-    } else if (result.count > 0) {
-      ImmichToast.show(
-        context: context,
-        msg: 'share_action_prompt'.t(context: context, args: {'count': result.count.toString()}),
-        gravity: ToastGravity.BOTTOM,
-        toastType: ToastType.success,
-      );
-    }
+          if (!result.success) {
+            ImmichToast.show(
+              context: context,
+              msg: 'scaffold_body_error_occurred'.t(context: context),
+              gravity: ToastGravity.BOTTOM,
+              toastType: ToastType.error,
+            );
+          }
+
+          buildContext.pop();
+        });
+
+        // show a loading spinner with a "Preparing" message
+        return const _SharePreparingDialog();
+      },
+      barrierDismissible: false,
+      useRootNavigator: false,
+    );
   }
 
   @override

mobile/lib/providers/infrastructure/action.provider.dart

@@ -334,8 +334,8 @@ class ActionNotifier extends Notifier<void> {
     final ids = _getAssets(source).toList(growable: false);
 
     try {
-      final count = await _service.shareAssets(ids);
-      return ActionResult(count: count, success: true);
+      await _service.shareAssets(ids);
+      return ActionResult(count: ids.length, success: true);
     } catch (error, stack) {
       _logger.severe('Failed to share assets', error, stack);
       return ActionResult(count: ids.length, success: false, error: error.toString());

mobile/lib/repositories/asset_media.repository.dart

@@ -104,15 +104,18 @@ class AssetMediaRepository {
       return 0;
     }
 
-    final result = await Share.shareXFiles(downloadedXFiles);
-
-    for (var file in downloadedXFiles) {
-      try {
-        await File(file.path).delete();
-      } catch (e) {
-        _log.warning("Failed to delete temporary file: ${file.path}", e);
+    // we dont want to await the share result since the
+    // "preparing" dialog will not disappear unti
+    Share.shareXFiles(downloadedXFiles).then((result) async {
+      for (var file in downloadedXFiles) {
+        try {
+          await File(file.path).delete();
+        } catch (e) {
+          _log.warning("Failed to delete temporary file: ${file.path}", e);
+        }
       }
-    }
-    return result.status == ShareResultStatus.success ? downloadedXFiles.length : 0;
+    });
+
+    return downloadedXFiles.length;
   }
 }