From b37ea01acadaa10a994ac1df6efbe7e86d7acf74 Mon Sep 17 00:00:00 2001
From: nyne <me@nyne.dev>
Date: Tue, 29 Apr 2025 11:18:59 +0800
Subject: [PATCH] Add an option to disable double tap to zoom.

---
 lib/foundation/appdata.dart    | 1 +
 lib/pages/reader/gesture.dart  | 6 ++++++
 lib/pages/reader/images.dart   | 1 +
 lib/pages/reader/reader.dart   | 3 +++
 lib/pages/settings/reader.dart | 8 ++++++++
 5 files changed, 19 insertions(+)

diff --git a/lib/foundation/appdata.dart b/lib/foundation/appdata.dart
index 7b1a898..9c1f210 100644
--- a/lib/foundation/appdata.dart
+++ b/lib/foundation/appdata.dart
@@ -185,6 +185,7 @@ class Settings with ChangeNotifier {
     'comicListDisplayMode': 'paging', // paging, continuous
     'showPageNumberInReader': true,
     'showSingleImageOnFirstPage': false,
+    'enableDoubleTapToZoom': true,
   };
 
   operator [](String key) {
diff --git a/lib/pages/reader/gesture.dart b/lib/pages/reader/gesture.dart
index 751af23..04a68e9 100644
--- a/lib/pages/reader/gesture.dart
+++ b/lib/pages/reader/gesture.dart
@@ -152,12 +152,18 @@ class _ReaderGestureDetectorState extends AutomaticGlobalState<_ReaderGestureDet
 
   bool _dragInProgress = false;
 
+  bool get _enableDoubleTapToZoom => appdata.settings["enableDoubleTapToZoom"];
+
   void onTapUp(TapUpDetails event) {
     if (_longPressInProgress) {
       _longPressInProgress = false;
       return;
     }
     final location = event.globalPosition;
+    if (!_enableDoubleTapToZoom) {
+      onTap(location);
+      return;
+    }
     final previousLocation = _previousEvent?.globalPosition;
     if (previousLocation != null) {
       if ((location - previousLocation).distanceSquared <
diff --git a/lib/pages/reader/images.dart b/lib/pages/reader/images.dart
index ba7e54f..fe4be2b 100644
--- a/lib/pages/reader/images.dart
+++ b/lib/pages/reader/images.dart
@@ -250,6 +250,7 @@ class _GalleryModeState extends State<_GalleryMode>
             }
 
             return PhotoViewGalleryPageOptions.customChild(
+              childSize: reader.size * 2,
               controller: photoViewControllers[index],
               minScale: PhotoViewComputedScale.contained * 1.0,
               maxScale: PhotoViewComputedScale.covered * 10.0,
diff --git a/lib/pages/reader/reader.dart b/lib/pages/reader/reader.dart
index a199948..6b732ba 100644
--- a/lib/pages/reader/reader.dart
+++ b/lib/pages/reader/reader.dart
@@ -112,6 +112,9 @@ class _ReaderState extends State<Reader>
 
   @override
   int get maxPage {
+    if (images == null) {
+      return 1;
+    }
     if (!showSingleImageOnFirstPage) {
       return (images!.length / imagesPerPage).ceil();
     } else {
diff --git a/lib/pages/settings/reader.dart b/lib/pages/settings/reader.dart
index cce23e6..3b5744d 100644
--- a/lib/pages/settings/reader.dart
+++ b/lib/pages/settings/reader.dart
@@ -113,6 +113,14 @@ class _ReaderSettingsState extends State<ReaderSettings> {
             },
           ),
         ),
+        _SwitchSetting(
+          title: 'Double tap to zoom'.tl,
+          settingKey: 'enableDoubleTapToZoom',
+          onChanged: () {
+            setState(() {});
+            widget.onChanged?.call('enableDoubleTapToZoom');
+          },
+        ).toSliver(),
         _SwitchSetting(
           title: 'Long press to zoom'.tl,
           settingKey: 'enableLongPressToZoom',