Open the share sheet on iPad for offline sessions and debug logs

lib/providers/app_state_provider.dart

@@ -6,7 +6,7 @@ import 'dart:math' as math;
 import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart' show SystemNavigator;
 import 'package:flutter/widgets.dart'
-    show WidgetsBinding, WidgetsBindingObserver, AppLifecycleState;
+    show WidgetsBinding, WidgetsBindingObserver, AppLifecycleState, Rect;
 import 'package:geolocator/geolocator.dart';
 import 'package:hive_flutter/hive_flutter.dart';
 import 'package:app_links/app_links.dart';
@@ -12035,12 +12035,15 @@ class AppStateProvider extends ChangeNotifier with WidgetsBindingObserver {
   /// Share a debug log file
   ///
   /// Uses the native share sheet to allow users to share logs via email, messaging, etc.
-  Future<void> shareDebugLog(File file) async {
+  /// [sharePositionOrigin] is the tapped button's global rect, which iPad needs
+  /// (see [shareOfflineSession]).
+  Future<void> shareDebugLog(File file, {Rect? sharePositionOrigin}) async {
     try {
       final result = await SharePlus.instance.share(
         ShareParams(
           files: [XFile(file.path)],
           subject: 'MeshMapper Debug Log',
+          sharePositionOrigin: sharePositionOrigin,
         ),
       );
       debugLog('[DEBUG] Shared log: ${file.path}, status: ${result.status}');
@@ -12053,7 +12056,12 @@ class AppStateProvider extends ChangeNotifier with WidgetsBindingObserver {
   /// to Files, Drive, email, …) — the mobile equivalent of the web JSON
   /// download. Mirrors [shareDebugLog]; writes the same pretty JSON the web
   /// path produces. Throws on failure so the caller can surface an error.
-  Future<void> shareOfflineSession(String filename) async {
+  ///
+  /// [sharePositionOrigin] is the global rect of the tapped button. iPad
+  /// anchors the share popover there, and share_plus refuses to open the
+  /// sheet on iPad without one.
+  Future<void> shareOfflineSession(String filename,
+      {Rect? sharePositionOrigin}) async {
     final data = _offlineSessionService.getSessionData(filename);
     if (data == null) {
       throw Exception('Session "$filename" not found');
@@ -12066,6 +12074,7 @@ class AppStateProvider extends ChangeNotifier with WidgetsBindingObserver {
       ShareParams(
         files: [XFile(file.path)],
         subject: 'MeshMapper Offline Session',
+        sharePositionOrigin: sharePositionOrigin,
       ),
     );
     debugLog('[OFFLINE] Shared session: $filename, status: ${result.status}');

lib/screens/settings/about_settings_page.dart

@@ -12,6 +12,7 @@ import 'package:intl/intl.dart';
 import '../../providers/app_state_provider.dart';
 import '../../services/debug_file_logger.dart';
 import '../../utils/constants.dart';
+import '../../utils/share_origin.dart';
 import '../../widgets/app_toast.dart';
 import '../../widgets/bug_report_dialog.dart';
 import '../../widgets/upload_logs_dialog.dart';
@@ -292,10 +293,14 @@ class _AboutSettingsPageState extends State<AboutSettingsPage> {
                                 _showLogViewer(context, appState, file),
                             tooltip: 'View',
                           ),
-                          IconButton(
-                            icon: const Icon(Icons.share, size: 20),
-                            onPressed: () => appState.shareDebugLog(file),
-                            tooltip: 'Share',
+                          Builder(
+                            builder: (buttonContext) => IconButton(
+                              icon: const Icon(Icons.share, size: 20),
+                              onPressed: () => appState.shareDebugLog(file,
+                                  sharePositionOrigin:
+                                      globalRectOf(buttonContext)),
+                              tooltip: 'Share',
+                            ),
                           ),
                         ],
                       ),

lib/screens/settings/data_settings_page.dart

@@ -10,6 +10,8 @@ import '../../utils/web_file_helpers_stub.dart'
 
 import '../../providers/app_state_provider.dart';
 import '../../services/offline_session_service.dart';
+import '../../utils/debug_logger_io.dart';
+import '../../utils/share_origin.dart';
 import 'settings_section_card.dart';
 
 /// Settings folder: Data.
@@ -83,8 +85,8 @@ class DataSettingsPage extends StatelessWidget {
                         context, appState, session.filename),
                     onDelete: () => _confirmDeleteOfflineSession(
                         context, appState, session.filename),
-                    onDownload: () => _downloadOfflineSession(
-                        context, appState, session.filename),
+                    onDownload: (origin) => _downloadOfflineSession(
+                        context, appState, session.filename, origin),
                   )),
           ]),
         ],
@@ -278,8 +280,8 @@ class DataSettingsPage extends StatelessWidget {
     );
   }
 
-  Future<void> _downloadOfflineSession(
-      BuildContext context, AppStateProvider appState, String filename) async {
+  Future<void> _downloadOfflineSession(BuildContext context,
+      AppStateProvider appState, String filename, Rect? origin) async {
     try {
       final sessionData =
           appState.offlineSessionService.getSessionData(filename);
@@ -317,9 +319,11 @@ class DataSettingsPage extends StatelessWidget {
       } else {
         // Mobile: write the JSON to a temp file and open the native share
         // sheet (Save to Files, Drive, email, …) — mirrors the debug-log share.
-        await appState.shareOfflineSession(filename);
+        await appState.shareOfflineSession(filename,
+            sharePositionOrigin: origin);
       }
     } catch (e) {
+      debugError('[OFFLINE] Failed to download session $filename: $e');
       if (context.mounted) {
         ScaffoldMessenger.of(context).showSnackBar(
           SnackBar(
@@ -338,7 +342,9 @@ class _OfflineSessionTile extends StatelessWidget {
   final bool uploadEnabled;
   final VoidCallback onUpload;
   final VoidCallback onDelete;
-  final VoidCallback onDownload;
+
+  /// Called with the download button's global rect (the iPad share anchor).
+  final ValueChanged<Rect?> onDownload;
 
   const _OfflineSessionTile({
     required this.session,
@@ -454,11 +460,13 @@ class _OfflineSessionTile extends StatelessWidget {
         mainAxisSize: MainAxisSize.min,
         children: [
           // Download button - always available
-          IconButton(
-            icon: const Icon(Icons.download),
-            onPressed: onDownload,
-            tooltip: 'Download JSON',
-            color: Colors.blue,
+          Builder(
+            builder: (buttonContext) => IconButton(
+              icon: const Icon(Icons.download),
+              onPressed: () => onDownload(globalRectOf(buttonContext)),
+              tooltip: 'Download JSON',
+              color: Colors.blue,
+            ),
           ),
           // Upload button - only when not uploaded
           if (!isUploaded)

lib/utils/share_origin.dart

@@ -0,0 +1,11 @@
+import 'package:flutter/widgets.dart';
+
+/// Global rect of the widget behind [context], or null before layout.
+///
+/// Pass it as share_plus's `sharePositionOrigin`: iPad anchors the share
+/// popover there and refuses to open the sheet without one.
+Rect? globalRectOf(BuildContext context) {
+  final box = context.findRenderObject() as RenderBox?;
+  if (box == null || !box.hasSize) return null;
+  return box.localToGlobal(Offset.zero) & box.size;
+}