improve reader; fix #21

assets/translation.json

@@ -171,7 +171,9 @@
     "Long press to zoom": "长按缩放",
     "Updates Available": "更新可用",
     "Unselected": "未选择",
-    "Long press and drag to reorder.": "长按并拖动以重新排序。"
+    "Long press and drag to reorder.": "长按并拖动以重新排序。",
+    "Limit image width": "限制图片宽度",
+    "When using Continuous(Top to Bottom) mode": "当使用连续（从上到下）模式"
   },
   "zh_TW": {
     "Home": "首頁",
@@ -345,6 +347,8 @@
     "Long press to zoom": "長按縮放",
     "Updates Available": "更新可用",
     "Unselected": "未選擇",
-    "Long press and drag to reorder.": "長按並拖動以重新排序。"
+    "Long press and drag to reorder.": "長按並拖動以重新排序。",
+    "Limit image width": "限制圖片寬度",
+    "When using Continuous(Top to Bottom) mode": "當使用連續（從上到下）模式"
   }
 }

lib/foundation/appdata.dart

@@ -113,6 +113,7 @@ class _Settings with ChangeNotifier {
     'downloadThreads': 5,
     'enableLongPressToZoom': true,
     'checkUpdateOnStart': true,
+    'limitImageWidth': true,
   };
 
   operator [](String key) {

lib/pages/reader/gesture.dart

@@ -22,6 +22,8 @@ class _ReaderGestureDetectorState extends State<_ReaderGestureDetector> {
 
   _DragListener? dragListener;
 
+  int fingers = 0;
+
   @override
   void initState() {
     _tapGestureRecognizer = TapGestureRecognizer()
@@ -38,6 +40,7 @@ class _ReaderGestureDetectorState extends State<_ReaderGestureDetector> {
     return Listener(
       behavior: HitTestBehavior.translucent,
       onPointerDown: (event) {
+        fingers++;
         _lastTapPointer = event.pointer;
         _lastTapMoveDistance = Offset.zero;
         _tapGestureRecognizer.addPointer(event);
@@ -46,7 +49,7 @@ class _ReaderGestureDetectorState extends State<_ReaderGestureDetector> {
           _dragInProgress = false;
         }
         Future.delayed(_kLongPressMinTime, () {
-          if (_lastTapPointer == event.pointer) {
+          if (_lastTapPointer == event.pointer && fingers == 1) {
             if(_lastTapMoveDistance!.distanceSquared < 20.0 * 20.0) {
               onLongPressedDown(event.position);
               _longPressInProgress = true;
@@ -67,6 +70,19 @@ class _ReaderGestureDetectorState extends State<_ReaderGestureDetector> {
         }
       },
       onPointerUp: (event) {
+        fingers--;
+        if (_longPressInProgress) {
+          onLongPressedUp(event.position);
+        }
+        if(_dragInProgress) {
+          dragListener?.onEnd?.call();
+          _dragInProgress = false;
+        }
+        _lastTapPointer = null;
+        _lastTapMoveDistance = null;
+      },
+      onPointerCancel: (event) {
+        fingers--;
         if (_longPressInProgress) {
           onLongPressedUp(event.position);
         }

lib/pages/reader/images.dart

@@ -471,18 +471,24 @@ class _ContinuousModeState extends State<_ContinuousMode>
       },
       child: widget,
     );
+    var width = MediaQuery.of(context).size.width;
+    var height = MediaQuery.of(context).size.height;
+    if(appdata.settings['limitImageWidth'] && width / height > 0.7) {
+      width = height * 0.7;
+    }
 
     return PhotoView.customChild(
       backgroundDecoration: BoxDecoration(
         color: context.colorScheme.surface,
       ),
+      childSize: Size(width, height),
       minScale: 1.0,
       maxScale: 2.5,
       strictScale: true,
       controller: photoViewController,
       child: SizedBox(
-        width: MediaQuery.of(context).size.width,
-        height: MediaQuery.of(context).size.height,
+        width: width,
+        height: height,
         child: widget,
       ),
     );

lib/pages/settings/reader.dart

@@ -61,6 +61,14 @@ class _ReaderSettingsState extends State<ReaderSettings> {
             widget.onChanged?.call('enableLongPressToZoom');
           },
         ).toSliver(),
+        _SwitchSetting(
+          title: 'Limit image width'.tl,
+          subtitle: 'When using Continuous(Top to Bottom) mode'.tl,
+          settingKey: 'limitImageWidth',
+          onChanged: () {
+            widget.onChanged?.call('limitImageWidth');
+          },
+        ).toSliver(),
       ],
     );
   }

lib/pages/settings/setting_components.dart

@@ -5,6 +5,7 @@ class _SwitchSetting extends StatefulWidget {
     required this.title,
     required this.settingKey,
     this.onChanged,
+    this.subtitle,
   });
 
   final String title;
@@ -13,6 +14,8 @@ class _SwitchSetting extends StatefulWidget {
 
   final VoidCallback? onChanged;
 
+  final String? subtitle;
+
   @override
   State<_SwitchSetting> createState() => _SwitchSettingState();
 }
@@ -24,6 +27,7 @@ class _SwitchSettingState extends State<_SwitchSetting> {
 
     return ListTile(
       title: Text(widget.title),
+      subtitle: widget.subtitle == null ? null : Text(widget.subtitle!),
       trailing: Switch(
         value: appdata.settings[widget.settingKey],
         onChanged: (value) {