#316 viewer: use fling gesture from edge to yield to outer scrollable when zoomed in

lib/widgets/viewer/entry_viewer_stack.dart

@@ -466,14 +466,16 @@ class _EntryViewerStackState extends State<EntryViewerStack> with EntryViewContr
       if (!_overlayVisible.value) {
         _overlayVisible.value = true;
       }
+    } else if (notification is PopVisualNotification) {
+      _popVisual();
     } else if (notification is ShowInfoPageNotification) {
       _goToVerticalPage(infoPage);
-    } else if (notification is JumpToPreviousEntryNotification) {
-      _jumpToHorizontalPageByDelta(-1);
-    } else if (notification is JumpToNextEntryNotification) {
-      _jumpToHorizontalPageByDelta(1);
-    } else if (notification is JumpToEntryNotification) {
-      _jumpToHorizontalPageByIndex(notification.index);
+    } else if (notification is ShowPreviousEntryNotification) {
+      _goToHorizontalPageByDelta(delta: -1, animate: notification.animate);
+    } else if (notification is ShowNextEntryNotification) {
+      _goToHorizontalPageByDelta(delta: 1, animate: notification.animate);
+    } else if (notification is ShowEntryNotification) {
+      _goToHorizontalPageByIndex(page: notification.index, animate: notification.animate);
     } else if (notification is VideoActionNotification) {
       final controller = notification.controller;
       final action = notification.action;
@@ -545,23 +547,33 @@ class _EntryViewerStackState extends State<EntryViewerStack> with EntryViewContr
     }
   }
 
-  void _jumpToHorizontalPageByDelta(int delta) {
+  void _goToHorizontalPageByDelta({required int delta, required bool animate}) {
     if (_horizontalPager.positions.isEmpty) return;
 
     final page = _horizontalPager.page?.round();
     if (page != null) {
-      _jumpToHorizontalPageByIndex(page + delta);
+      _goToHorizontalPageByIndex(page: page + delta, animate: animate);
     }
   }
 
-  void _jumpToHorizontalPageByIndex(int target) {
+  Future<void> _goToHorizontalPageByIndex({required int page, required bool animate}) async {
     final _collection = collection;
     if (_collection != null) {
       if (!widget.viewerController.repeat) {
-        target = target.clamp(0, _collection.entryCount - 1);
+        page = page.clamp(0, _collection.entryCount - 1);
+      }
+      if (_currentEntryIndex != page) {
+        final animationDuration = animate ? context.read<DurationsData>().viewerVerticalPageScrollAnimation : Duration.zero;
+        if (animationDuration > Duration.zero) {
+          // duration & curve should feel similar to changing page by vertical fling
+          await _horizontalPager.animateToPage(
+            page,
+            duration: animationDuration,
+            curve: Curves.easeOutQuart,
+          );
+        } else {
+          _horizontalPager.jumpToPage(page);
         }
-      if (_currentEntryIndex != target) {
-        _horizontalPager.jumpToPage(target);
       }
     }
   }

lib/widgets/viewer/notifications.dart

@@ -6,6 +6,9 @@ import 'package:aves/widgets/viewer/video/controller.dart';
 import 'package:equatable/equatable.dart';
 import 'package:flutter/widgets.dart';
 
+@immutable
+class PopVisualNotification extends Notification {}
+
 @immutable
 class ShowImageNotification extends Notification {}
 
@@ -13,10 +16,29 @@ class ShowImageNotification extends Notification {}
 class ShowInfoPageNotification extends Notification {}
 
 @immutable
-class TvShowLessInfoNotification extends Notification {}
+class ShowPreviousEntryNotification extends Notification {
+  final bool animate;
+
+  const ShowPreviousEntryNotification({required this.animate});
+}
 
 @immutable
-class TvShowMoreInfoNotification extends Notification {}
+class ShowNextEntryNotification extends Notification {
+  final bool animate;
+
+  const ShowNextEntryNotification({required this.animate});
+}
+
+@immutable
+class ShowEntryNotification extends Notification {
+  final bool animate;
+  final int index;
+
+  const ShowEntryNotification({
+    required this.animate,
+    required this.index,
+  });
+}
 
 @immutable
 class ToggleOverlayNotification extends Notification {
@@ -26,17 +48,10 @@ class ToggleOverlayNotification extends Notification {
 }
 
 @immutable
-class JumpToPreviousEntryNotification extends Notification {}
+class TvShowLessInfoNotification extends Notification {}
 
 @immutable
-class JumpToNextEntryNotification extends Notification {}
-
-@immutable
-class JumpToEntryNotification extends Notification {
-  final int index;
-
-  const JumpToEntryNotification({required this.index});
-}
+class TvShowMoreInfoNotification extends Notification {}
 
 @immutable
 class VideoActionNotification extends Notification {

lib/widgets/viewer/overlay/thumbnail_preview.dart

@@ -60,13 +60,13 @@ class _ViewerThumbnailPreviewState extends State<ViewerThumbnailPreview> {
       entryCount: entryCount,
       entryBuilder: (index) => 0 <= index && index < entryCount ? entries[index] : null,
       indexNotifier: _entryIndexNotifier,
-      onTap: (index) => JumpToEntryNotification(index: index).dispatch(context),
+      onTap: (index) => ShowEntryNotification(animate: false, index: index).dispatch(context),
     );
   }
 
   void _onScrollerIndexChanged() => _debouncer(() {
         if (mounted) {
-          JumpToEntryNotification(index: _entryIndexNotifier.value).dispatch(context);
+          ShowEntryNotification(animate: false, index: _entryIndexNotifier.value).dispatch(context);
         }
       });
 }

lib/widgets/viewer/visual/entry_page_view.dart

@@ -401,20 +401,38 @@ class _EntryPageViewState extends State<EntryPageView> with SingleTickerProvider
       onScaleStart: onScaleStart,
       onScaleUpdate: onScaleUpdate,
       onScaleEnd: onScaleEnd,
+      onFling: _onFling,
       onTap: (c, s, a, p) => _onTap(alignment: a),
       onDoubleTap: onDoubleTap,
       child: child,
     );
   }
 
+  void _onFling(AxisDirection direction) {
+    switch (direction) {
+      case AxisDirection.left:
+        const ShowPreviousEntryNotification(animate: true).dispatch(context);
+        break;
+      case AxisDirection.right:
+        const ShowNextEntryNotification(animate: true).dispatch(context);
+        break;
+      case AxisDirection.up:
+        PopVisualNotification().dispatch(context);
+        break;
+      case AxisDirection.down:
+        ShowInfoPageNotification().dispatch(context);
+        break;
+    }
+  }
+
   void _onTap({Alignment? alignment}) {
     if (settings.viewerGestureSideTapNext && alignment != null) {
       final x = alignment.x;
       if (x < sideRatio) {
-        JumpToPreviousEntryNotification().dispatch(context);
+        const ShowPreviousEntryNotification(animate: false).dispatch(context);
         return;
       } else if (x > 1 - sideRatio) {
-        JumpToNextEntryNotification().dispatch(context);
+        const ShowNextEntryNotification(animate: false).dispatch(context);
         return;
       }
     }

plugins/aves_magnifier/lib/src/controller/controller_delegate.dart

@@ -138,9 +138,9 @@ mixin AvesMagnifierControllerDelegate on State<MagnifierCore> {
     controller.setScaleState(nextScaleState, source, childFocalPoint: childFocalPoint);
   }
 
-  CornersRange cornersX({double? scale}) {
+  EdgeRange getXEdges({double? scale}) {
     final boundaries = scaleBoundaries;
-    if (boundaries == null) return const CornersRange(0, 0);
+    if (boundaries == null) return const EdgeRange(0, 0);
 
     final _scale = scale ?? this.scale!;
 
@@ -152,12 +152,12 @@ mixin AvesMagnifierControllerDelegate on State<MagnifierCore> {
 
     final minX = ((positionX - 1).abs() / 2) * widthDiff * -1;
     final maxX = ((positionX + 1).abs() / 2) * widthDiff;
-    return CornersRange(minX, maxX);
+    return EdgeRange(minX, maxX);
   }
 
-  CornersRange cornersY({double? scale}) {
+  EdgeRange getYEdges({double? scale}) {
     final boundaries = scaleBoundaries;
-    if (boundaries == null) return const CornersRange(0, 0);
+    if (boundaries == null) return const EdgeRange(0, 0);
 
     final _scale = scale ?? this.scale!;
 
@@ -169,7 +169,7 @@ mixin AvesMagnifierControllerDelegate on State<MagnifierCore> {
 
     final minY = ((positionY - 1).abs() / 2) * heightDiff * -1;
     final maxY = ((positionY + 1).abs() / 2) * heightDiff;
-    return CornersRange(minY, maxY);
+    return EdgeRange(minY, maxY);
   }
 
   Offset clampPosition({Offset? position, double? scale}) {
@@ -187,14 +187,14 @@ mixin AvesMagnifierControllerDelegate on State<MagnifierCore> {
 
     var finalX = 0.0;
     if (screenWidth < computedWidth) {
-      final cornersX = this.cornersX(scale: _scale);
-      finalX = _position.dx.clamp(cornersX.min, cornersX.max);
+      final range = getXEdges(scale: _scale);
+      finalX = _position.dx.clamp(range.min, range.max);
     }
 
     var finalY = 0.0;
     if (screenHeight < computedHeight) {
-      final cornersY = this.cornersY(scale: _scale);
-      finalY = _position.dy.clamp(cornersY.min, cornersY.max);
+      final range = getYEdges(scale: _scale);
+      finalY = _position.dy.clamp(range.min, range.max);
     }
 
     return Offset(finalX, finalY);
@@ -202,8 +202,8 @@ mixin AvesMagnifierControllerDelegate on State<MagnifierCore> {
 }
 
 /// Simple class to store a min and a max value
-class CornersRange {
-  const CornersRange(this.min, this.max);
+class EdgeRange {
+  const EdgeRange(this.min, this.max);
 
   final double min;
   final double max;

plugins/aves_magnifier/lib/src/core/core.dart

@@ -5,11 +5,14 @@ import 'package:aves_magnifier/src/controller/controller_delegate.dart';
 import 'package:aves_magnifier/src/controller/state.dart';
 import 'package:aves_magnifier/src/core/gesture_detector.dart';
 import 'package:aves_magnifier/src/magnifier.dart';
-import 'package:aves_magnifier/src/pan/corner_hit_detector.dart';
+import 'package:aves_magnifier/src/pan/edge_hit_detector.dart';
 import 'package:aves_magnifier/src/scale/scale_boundaries.dart';
 import 'package:aves_magnifier/src/scale/state.dart';
 import 'package:equatable/equatable.dart';
+import 'package:flutter/gestures.dart';
 import 'package:flutter/widgets.dart';
+import 'package:provider/provider.dart';
+import 'package:tuple/tuple.dart';
 
 /// Internal widget in which controls all animations lifecycle, core responses
 /// to user gestures, updates to the controller state and mounts the entire Layout
@@ -21,6 +24,7 @@ class MagnifierCore extends StatefulWidget {
   final MagnifierGestureScaleStartCallback? onScaleStart;
   final MagnifierGestureScaleUpdateCallback? onScaleUpdate;
   final MagnifierGestureScaleEndCallback? onScaleEnd;
+  final MagnifierGestureFlingCallback? onFling;
   final MagnifierTapCallback? onTap;
   final MagnifierDoubleTapCallback? onDoubleTap;
   final Widget child;
@@ -34,6 +38,7 @@ class MagnifierCore extends StatefulWidget {
     this.onScaleStart,
     this.onScaleUpdate,
     this.onScaleEnd,
+    this.onFling,
     this.onTap,
     this.onDoubleTap,
     required this.child,
@@ -43,7 +48,7 @@ class MagnifierCore extends StatefulWidget {
   State<StatefulWidget> createState() => _MagnifierCoreState();
 }
 
-class _MagnifierCoreState extends State<MagnifierCore> with TickerProviderStateMixin, AvesMagnifierControllerDelegate, CornerHitDetector {
+class _MagnifierCoreState extends State<MagnifierCore> with TickerProviderStateMixin, AvesMagnifierControllerDelegate, EdgeHitDetector {
   Offset? _startFocalPoint, _lastViewportFocalPosition;
   double? _startScale, _quickScaleLastY, _quickScaleLastDistance;
   late bool _dropped, _doubleTap, _quickScaleMoved;
@@ -57,6 +62,8 @@ class _MagnifierCoreState extends State<MagnifierCore> with TickerProviderStateM
 
   ScaleBoundaries? cachedScaleBoundaries;
 
+  static const _flingPointerKind = PointerDeviceKind.unknown;
+
   @override
   void initState() {
     super.initState();
@@ -104,12 +111,21 @@ class _MagnifierCoreState extends State<MagnifierCore> with TickerProviderStateM
     controller.update(position: _positionAnimation.value, source: ChangeSource.animation);
   }
 
+  Stopwatch? _scaleStopwatch;
+  VelocityTracker? _velocityTracker;
+  var _mayFlingLTRB = const Tuple4(false, false, false, false);
+
   void onScaleStart(ScaleStartDetails details, bool doubleTap) {
     final boundaries = scaleBoundaries;
     if (boundaries == null) return;
 
     widget.onScaleStart?.call(details, doubleTap, boundaries);
 
+    _scaleStopwatch = Stopwatch()..start();
+    _velocityTracker = VelocityTracker.withKind(_flingPointerKind);
+    _mayFlingLTRB = const Tuple4(true, true, true, true);
+    _updateMayFling();
+
     _startScale = scale;
     _startFocalPoint = details.localFocalPoint;
     _lastViewportFocalPosition = _startFocalPoint;
@@ -130,6 +146,12 @@ class _MagnifierCoreState extends State<MagnifierCore> with TickerProviderStateM
     _dropped |= widget.onScaleUpdate?.call(details) ?? false;
     if (_dropped) return;
 
+    final elapsed = _scaleStopwatch?.elapsed;
+    if (elapsed != null) {
+      _velocityTracker?.addPosition(elapsed, details.focalPoint);
+    }
+    _updateMayFling();
+
     double newScale;
     if (_doubleTap) {
       // quick scale, aka one finger zoom
@@ -168,6 +190,29 @@ class _MagnifierCoreState extends State<MagnifierCore> with TickerProviderStateM
 
     widget.onScaleEnd?.call(details);
 
+    _updateMayFling();
+    final estimate = _velocityTracker?.getVelocityEstimate();
+    final onFling = widget.onFling;
+    if (estimate != null && onFling != null) {
+      if (_isFlingGesture(estimate, _flingPointerKind, Axis.horizontal)) {
+        final left = _mayFlingLTRB.item1;
+        final right = _mayFlingLTRB.item3;
+        if (left) {
+          onFling(AxisDirection.left);
+        } else if (right) {
+          onFling(AxisDirection.right);
+        }
+      } else if (_isFlingGesture(estimate, _flingPointerKind, Axis.vertical)) {
+        final up = _mayFlingLTRB.item2;
+        final down = _mayFlingLTRB.item4;
+        if (up) {
+          onFling(AxisDirection.up);
+        } else if (down) {
+          onFling(AxisDirection.down);
+        }
+      }
+    }
+
     final _position = controller.position;
     final _scale = controller.scale!;
     final maxScale = boundaries.maxScale;
@@ -208,6 +253,31 @@ class _MagnifierCoreState extends State<MagnifierCore> with TickerProviderStateM
     }
   }
 
+  void _updateMayFling() {
+    final xHit = getXEdgeHit();
+    final yHit = getYEdgeHit();
+    _mayFlingLTRB = Tuple4(
+      _mayFlingLTRB.item1 && xHit.hasHitMin,
+      _mayFlingLTRB.item2 && yHit.hasHitMin,
+      _mayFlingLTRB.item3 && xHit.hasHitMax,
+      _mayFlingLTRB.item4 && yHit.hasHitMax,
+    );
+  }
+
+  bool _isFlingGesture(VelocityEstimate estimate, PointerDeviceKind kind, Axis axis) {
+    final gestureSettings = context.read<MediaQueryData>().gestureSettings;
+    const minVelocity = kMinFlingVelocity;
+    final minDistance = computeHitSlop(kind, gestureSettings);
+
+    final pps = estimate.pixelsPerSecond;
+    final offset = estimate.offset;
+    if (axis == Axis.horizontal) {
+      return pps.dx.abs() > minVelocity && offset.dx.abs() > minDistance;
+    } else {
+      return pps.dy.abs() > minVelocity && offset.dy.abs() > minDistance;
+    }
+  }
+
   Duration _getAnimationDurationForVelocity({
     required Cubic curve,
     required Tween<Offset> tween,

plugins/aves_magnifier/lib/src/core/gesture_detector.dart

@@ -1,5 +1,5 @@
 import 'package:aves_magnifier/src/core/scale_gesture_recognizer.dart';
-import 'package:aves_magnifier/src/pan/corner_hit_detector.dart';
+import 'package:aves_magnifier/src/pan/edge_hit_detector.dart';
 import 'package:aves_magnifier/src/pan/gesture_detector_scope.dart';
 import 'package:flutter/gestures.dart';
 import 'package:flutter/widgets.dart';
@@ -19,7 +19,7 @@ class MagnifierGestureDetector extends StatefulWidget {
     this.child,
   });
 
-  final CornerHitDetector hitDetector;
+  final EdgeHitDetector hitDetector;
   final void Function(ScaleStartDetails details, bool doubleTap)? onScaleStart;
   final GestureScaleUpdateCallback? onScaleUpdate;
   final GestureScaleEndCallback? onScaleEnd;

plugins/aves_magnifier/lib/src/core/scale_gesture_recognizer.dart

@@ -1,12 +1,12 @@
 import 'dart:math';
 
 import 'package:aves_magnifier/aves_magnifier.dart';
-import 'package:aves_magnifier/src/pan/corner_hit_detector.dart';
+import 'package:aves_magnifier/src/pan/edge_hit_detector.dart';
 import 'package:flutter/gestures.dart';
 import 'package:flutter/widgets.dart';
 
 class MagnifierGestureRecognizer extends ScaleGestureRecognizer {
-  final CornerHitDetector hitDetector;
+  final EdgeHitDetector hitDetector;
   final MagnifierGestureDetectorScope scope;
   final ValueNotifier<TapDownDetails?> doubleTapDetails;
 
@@ -104,14 +104,15 @@ class MagnifierGestureRecognizer extends ScaleGestureRecognizer {
     }
 
     final validateAxis = scope.axis;
+    final canFling = scope.escapeByFling;
     final move = _initialFocalPoint! - _currentFocalPoint!;
     bool shouldMove = scope.acceptPointerEvent?.call(move) ?? false;
 
     if (!shouldMove) {
       if (validateAxis.length == 2) {
         // the image is the descendant of gesture detector(s) handling drag in both directions
-        final shouldMoveX = validateAxis.contains(Axis.horizontal) && hitDetector.shouldMoveX(move);
-        final shouldMoveY = validateAxis.contains(Axis.vertical) && hitDetector.shouldMoveY(move);
+        final shouldMoveX = validateAxis.contains(Axis.horizontal) && hitDetector.shouldMoveX(move, canFling);
+        final shouldMoveY = validateAxis.contains(Axis.vertical) && hitDetector.shouldMoveY(move, canFling);
         if (shouldMoveX == shouldMoveY) {
           // consistently can/cannot pan the image in both direction the same way
           shouldMove = shouldMoveX;
@@ -122,7 +123,7 @@ class MagnifierGestureRecognizer extends ScaleGestureRecognizer {
         }
       } else {
         // the image is the descendant of a gesture detector handling drag in one direction
-        shouldMove = validateAxis.contains(Axis.vertical) ? hitDetector.shouldMoveY(move) : hitDetector.shouldMoveX(move);
+        shouldMove = validateAxis.contains(Axis.vertical) ? hitDetector.shouldMoveY(move, canFling) : hitDetector.shouldMoveX(move, canFling);
       }
     }
 

plugins/aves_magnifier/lib/src/magnifier.dart

@@ -32,6 +32,7 @@ class AvesMagnifier extends StatelessWidget {
     this.onScaleStart,
     this.onScaleUpdate,
     this.onScaleEnd,
+    this.onFling,
     this.onTap,
     this.onDoubleTap,
     required this.child,
@@ -58,6 +59,7 @@ class AvesMagnifier extends StatelessWidget {
   final MagnifierGestureScaleStartCallback? onScaleStart;
   final MagnifierGestureScaleUpdateCallback? onScaleUpdate;
   final MagnifierGestureScaleEndCallback? onScaleEnd;
+  final MagnifierGestureFlingCallback? onFling;
   final MagnifierTapCallback? onTap;
   final MagnifierDoubleTapCallback? onDoubleTap;
   final Widget child;
@@ -82,6 +84,7 @@ class AvesMagnifier extends StatelessWidget {
           onScaleStart: onScaleStart,
           onScaleUpdate: onScaleUpdate,
           onScaleEnd: onScaleEnd,
+          onFling: onFling,
           onTap: onTap,
           onDoubleTap: onDoubleTap,
           child: child,
@@ -101,3 +104,4 @@ typedef MagnifierDoubleTapCallback = bool Function(Alignment alignment);
 typedef MagnifierGestureScaleStartCallback = void Function(ScaleStartDetails details, bool doubleTap, ScaleBoundaries boundaries);
 typedef MagnifierGestureScaleUpdateCallback = bool Function(ScaleUpdateDetails details);
 typedef MagnifierGestureScaleEndCallback = void Function(ScaleEndDetails details);
+typedef MagnifierGestureFlingCallback = void Function(AxisDirection direction);

plugins/aves_magnifier/lib/src/pan/corner_hit_detector.dart

@@ -1,69 +0,0 @@
-import 'package:aves_magnifier/src/controller/controller_delegate.dart';
-import 'package:flutter/foundation.dart';
-import 'package:flutter/widgets.dart';
-
-mixin CornerHitDetector on AvesMagnifierControllerDelegate {
-  // the child width/height is not accurate for some image size & scale combos
-  // e.g. 3580.0 * 0.1005586592178771 yields 360.0
-  // but 4764.0 * 0.07556675062972293 yields 360.00000000000006
-  // so be sure to compare with `precisionErrorTolerance`
-
-  _CornerHit _hitCornersX() {
-    final boundaries = scaleBoundaries;
-    if (boundaries == null) return const _CornerHit(false, false);
-
-    final childWidth = boundaries.childSize.width * scale!;
-    final viewportWidth = boundaries.viewportSize.width;
-    if (viewportWidth + precisionErrorTolerance >= childWidth) {
-      return const _CornerHit(true, true);
-    }
-    final x = -position.dx;
-    final cornersX = this.cornersX();
-    return _CornerHit(x <= cornersX.min, x >= cornersX.max);
-  }
-
-  _CornerHit _hitCornersY() {
-    final boundaries = scaleBoundaries;
-    if (boundaries == null) return const _CornerHit(false, false);
-
-    final childHeight = boundaries.childSize.height * scale!;
-    final viewportHeight = boundaries.viewportSize.height;
-    if (viewportHeight + precisionErrorTolerance >= childHeight) {
-      return const _CornerHit(true, true);
-    }
-    final y = -position.dy;
-    final cornersY = this.cornersY();
-    return _CornerHit(y <= cornersY.min, y >= cornersY.max);
-  }
-
-  bool shouldMoveX(Offset move) {
-    final hitCornersX = _hitCornersX();
-    if (hitCornersX.hasHitAny && move != Offset.zero) {
-      if (hitCornersX.hasHitBoth) return false;
-      if (hitCornersX.hasHitMax) return move.dx < 0;
-      return move.dx > 0;
-    }
-    return true;
-  }
-
-  bool shouldMoveY(Offset move) {
-    final hitCornersY = _hitCornersY();
-    if (hitCornersY.hasHitAny && move != Offset.zero) {
-      if (hitCornersY.hasHitBoth) return false;
-      if (hitCornersY.hasHitMax) return move.dy < 0;
-      return move.dy > 0;
-    }
-    return true;
-  }
-}
-
-class _CornerHit {
-  const _CornerHit(this.hasHitMin, this.hasHitMax);
-
-  final bool hasHitMin;
-  final bool hasHitMax;
-
-  bool get hasHitAny => hasHitMin || hasHitMax;
-
-  bool get hasHitBoth => hasHitMin && hasHitMax;
-}

plugins/aves_magnifier/lib/src/pan/edge_hit_detector.dart

@@ -0,0 +1,68 @@
+import 'package:aves_magnifier/src/controller/controller_delegate.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/widgets.dart';
+
+mixin EdgeHitDetector on AvesMagnifierControllerDelegate {
+  // the child width/height is not accurate for some image size & scale combos
+  // e.g. 3580.0 * 0.1005586592178771 yields 360.0
+  // but 4764.0 * 0.07556675062972293 yields 360.00000000000006
+  // so be sure to compare with `precisionErrorTolerance`
+
+  EdgeHit getXEdgeHit() {
+    final boundaries = scaleBoundaries;
+    if (boundaries == null) return const EdgeHit(false, false);
+
+    final childWidth = boundaries.childSize.width * scale!;
+    final viewportWidth = boundaries.viewportSize.width;
+    if (viewportWidth + precisionErrorTolerance >= childWidth) {
+      return const EdgeHit(true, true);
+    }
+    final x = -position.dx;
+    final range = getXEdges();
+    return EdgeHit(x <= range.min, x >= range.max);
+  }
+
+  EdgeHit getYEdgeHit() {
+    final boundaries = scaleBoundaries;
+    if (boundaries == null) return const EdgeHit(false, false);
+
+    final childHeight = boundaries.childSize.height * scale!;
+    final viewportHeight = boundaries.viewportSize.height;
+    if (viewportHeight + precisionErrorTolerance >= childHeight) {
+      return const EdgeHit(true, true);
+    }
+    final y = -position.dy;
+    final range = getYEdges();
+    return EdgeHit(y <= range.min, y >= range.max);
+  }
+
+  bool shouldMoveX(Offset move, bool canFling) {
+    final hit = getXEdgeHit();
+    return _shouldMove(hit, move.dx) || (canFling && !hit.hasHitBoth);
+  }
+
+  bool shouldMoveY(Offset move, bool canFling) {
+    final hit = getYEdgeHit();
+    return _shouldMove(hit, move.dy) || (canFling && !hit.hasHitBoth);
+  }
+
+  bool _shouldMove(EdgeHit hit, double move) {
+    if (hit.hasHitAny && move != 0) {
+      if (hit.hasHitBoth) return false;
+      if (hit.hasHitMax) return move < 0;
+      return move > 0;
+    }
+    return true;
+  }
+}
+
+class EdgeHit {
+  const EdgeHit(this.hasHitMin, this.hasHitMax);
+
+  final bool hasHitMin;
+  final bool hasHitMax;
+
+  bool get hasHitAny => hasHitMin || hasHitMax;
+
+  bool get hasHitBoth => hasHitMin && hasHitMax;
+}

plugins/aves_magnifier/lib/src/pan/gesture_detector_scope.dart

@@ -14,12 +14,18 @@ class MagnifierGestureDetectorScope extends InheritedWidget {
   // <1: less reactive but gives the most leeway to other recognizers
   // 1: will not be able to compete with a `HorizontalDragGestureRecognizer` up the widget tree
   final double touchSlopFactor;
+
+  // when zoomed in and hitting an edge, allow using a fling gesture to go to the previous/next page,
+  // instead of yielding to the outer scrollable right away
+  final bool escapeByFling;
+
   final bool? Function(Offset move)? acceptPointerEvent;
 
   const MagnifierGestureDetectorScope({
     super.key,
     required this.axis,
     this.touchSlopFactor = .8,
+    this.escapeByFling = true,
     this.acceptPointerEvent,
     required Widget child,
   }) : super(child: child);

plugins/aves_magnifier/pubspec.lock

@@ -91,6 +91,14 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.99"
+  tuple:
+    dependency: "direct main"
+    description:
+      name: tuple
+      sha256: "0ea99cd2f9352b2586583ab2ce6489d1f95a5f6de6fb9492faaf97ae2060f0aa"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.1"
   vector_math:
     dependency: transitive
     description:

plugins/aves_magnifier/pubspec.yaml

@@ -10,6 +10,7 @@ dependencies:
     sdk: flutter
   equatable:
   provider:
+  tuple:
 
 dev_dependencies:
   flutter_lints: