From 06aed2a586c6a4a8916183d4a03f525d4344cb90 Mon Sep 17 00:00:00 2001
From: vjrj <vjrj@comunes.org>
Date: Wed, 8 Jul 2026 14:18:10 +0200
Subject: [PATCH] fix(ui): enable mouse/trackpad drag scrolling on desktop

Flutter disables pointer-drag on scrollables/PageViews on desktop by default,
so the small photo carousel (and lists) couldn't be swiped with a mouse. Add an
app-wide ScrollBehavior that includes mouse/trackpad/stylus drag devices.

54 tests green; Linux runs.
---
 apps/app_seeds/lib/app.dart | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/apps/app_seeds/lib/app.dart b/apps/app_seeds/lib/app.dart
index c392f83..57bae14 100644
--- a/apps/app_seeds/lib/app.dart
+++ b/apps/app_seeds/lib/app.dart
@@ -1,3 +1,4 @@
+import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:flutter_localizations/flutter_localizations.dart';
@@ -62,6 +63,10 @@ class TaneApp extends StatelessWidget {
         onGenerateTitle: (context) => context.t.app.title,
         debugShowCheckedModeBanner: false,
         theme: buildTaneTheme(),
+        // Let scrollables & PageViews be dragged with a mouse/trackpad on
+        // desktop (Flutter disables that by default), so the photo carousel and
+        // lists swipe there too.
+        scrollBehavior: const _DragScrollBehavior(),
         locale: TranslationProvider.of(context).flutterLocale,
         supportedLocales: AppLocaleUtils.supportedLocales,
         localizationsDelegates: const [
@@ -74,3 +79,17 @@ class TaneApp extends StatelessWidget {
     );
   }
 }
+
+/// Enables mouse/trackpad drag scrolling (off by default on desktop) so the
+/// photo carousel and lists can be swiped with a pointer.
+class _DragScrollBehavior extends MaterialScrollBehavior {
+  const _DragScrollBehavior();
+
+  @override
+  Set<PointerDeviceKind> get dragDevices => {
+    PointerDeviceKind.touch,
+    PointerDeviceKind.mouse,
+    PointerDeviceKind.trackpad,
+    PointerDeviceKind.stylus,
+  };
+}