Revert "Use custom gesture detector"

This reverts commit f57c276ab1.

lib/viewer/single.dart

@@ -1,8 +1,6 @@
-import 'dart:ui';
 import 'package:dio/dio.dart';
 import 'package:dio_image_provider/dio_image_provider.dart';
 import 'package:flutter/foundation.dart';
-import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/scheduler.dart';
 import 'package:flutter/services.dart';
@@ -18,12 +16,6 @@ import '../globals.dart';
 
 final _log = Logger("SinglePageViewer");
 
-enum DoubleTapScaleMode {
-  fitScreen,
-  orignal,
-  twice,
-}
-
 class SinglePageViewerExtra {
   const SinglePageViewerExtra({this.data, this.files});
   final GalleryData? data;
@@ -52,8 +44,6 @@ class _SinglePageViewer extends State<SinglePageViewer>
   late List<ExtendedPMeta>? _pages;
   late EhFiles? _files;
   late String _back;
-  late PhotoViewController _photoViewController;
-  late DoubleTapScaleMode _doubleTapScaleMode;
   CancelToken? _cancel;
   bool _isLoading = false;
   bool _pageChanged = false;
@@ -79,8 +69,6 @@ class _SinglePageViewer extends State<SinglePageViewer>
     _updatePages();
     _files = widget.files;
     _back = "/gallery/${widget.gid}";
-    _photoViewController = PhotoViewController();
-    _doubleTapScaleMode = DoubleTapScaleMode.fitScreen;
     super.initState();
   }
 
@@ -88,7 +76,6 @@ class _SinglePageViewer extends State<SinglePageViewer>
   void dispose() {
     _cancel?.cancel();
     _pageController.dispose();
-    _photoViewController.dispose();
     super.dispose();
   }
 
@@ -137,10 +124,6 @@ class _SinglePageViewer extends State<SinglePageViewer>
       builder: (BuildContext context, int index) {
         final data = _pages![index];
         final f = _files!.files[data.token]!.first;
-        if (_index != index) {
-          _photoViewController.reset();
-          _doubleTapScaleMode = DoubleTapScaleMode.fitScreen;
-        }
         return PhotoViewGalleryPageOptions(
           imageProvider: DioImage.string(
             api.getFileUrl(f.id),
@@ -152,8 +135,6 @@ class _SinglePageViewer extends State<SinglePageViewer>
             transitionOnUserGestures: true,
           ),
           filterQuality: FilterQuality.high,
-          controller: _photoViewController,
-          disableGestures: true,
         );
       },
       onPageChanged: (index) {
@@ -198,73 +179,14 @@ class _SinglePageViewer extends State<SinglePageViewer>
           _showMenu = !_showMenu;
         });
       },
-      onDoubleTap: () {
-        setState(() {
-          switch (_doubleTapScaleMode) {
-            case DoubleTapScaleMode.fitScreen:
-              _doubleTapScaleMode = DoubleTapScaleMode.orignal;
-              _photoViewController.scale = 1.0;
-              break;
-            case DoubleTapScaleMode.orignal:
-              _doubleTapScaleMode = DoubleTapScaleMode.twice;
-              _photoViewController.scale = 2.0;
-              break;
-            case DoubleTapScaleMode.twice:
-              _doubleTapScaleMode = DoubleTapScaleMode.fitScreen;
-              _photoViewController.scale = null;
-              break;
-          }
-        });
-      },
-      child: child,
-    );
-  }
-
-  Widget _buildWithDragSupport(BuildContext context, {required Widget child}) {
-    return RawGestureDetector(
-      gestures: {
-        PanGestureRecognizer:
-            GestureRecognizerFactoryWithHandlers<PanGestureRecognizer>(
-          () => PanGestureRecognizer(
-            allowedButtonsFilter: (buttons) => buttons == kPrimaryMouseButton,
-          ),
-          (instance) {
-            instance.onUpdate = (details) {
-              final position = _photoViewController.position;
-              _photoViewController.position = Offset(
-                  position.dx + details.delta.dx,
-                  position.dy + details.delta.dy);
-              setState(() {});
-            };
-          },
-        ),
-      },
-      child: child,
-    );
-  }
-
-  Widget _buildWithScrollSupport(BuildContext context,
-      {required Widget child}) {
-    return Listener(
-      onPointerSignal: (event) {
-        if (event is PointerScrollEvent &&
-            event.kind == PointerDeviceKind.mouse) {
-          if (_photoViewController.scale != null) {
-            _photoViewController.scale = _photoViewController.scale! *
-                (1 - event.scrollDelta.dy / MediaQuery.of(context).size.height);
-          }
-        }
-      },
       child: child,
     );
   }
 
   Widget _buildViewer(BuildContext context) {
-    return _buildWithDragSupport(context,
-        child: _buildWithScrollSupport(context,
-            child: _buildWithTap(context,
-                child: _buildWithKeyboardSupport(context,
-                    child: _buildGallery(context)))));
+    return _buildWithTap(context,
+        child:
+            _buildWithKeyboardSupport(context, child: _buildGallery(context)));
   }
 
   Widget _buildTopAppBar(BuildContext context) {