scroll view patch

Signed-off-by: dom <githubaccount56556@proton.me>

lib/scripts/patch.ps1

@@ -11,9 +11,13 @@ $ToolTipFix = "56956c33ef102ac0b5fc46b62bd2dd9f50a86616";
 $NewOverScrollIndicator = "362b1de29974ffc1ed6faa826e1df870d7bec75f";
 
 $BottomSheetPatch = "lib/scripts/bottom_sheet.patch"
+
+$ScrollViewPatch = "lib/scripts/scroll_view.patch"
+
 # TODO: remove
 # https://github.com/flutter/flutter/issues/90223
 $ModalBarrierPatch = "lib/scripts/modal_barrier.patch"
+
 # TODO: remove
 # https://github.com/flutter/flutter/issues/182466
 $MouseCursorPatch = "lib/scripts/mouse_cursor.patch"
@@ -28,8 +32,11 @@ switch ($platform.ToLower()) {
     "android" {
         $reverts += $NewOverScrollIndicator
         $patches += $BottomSheetPatch
+        $patches += $ScrollViewPatch
+    }
+    "ios" {
+        $patches += $ScrollViewPatch
     }
-    "ios" {}
     "linux" {
         $picks += $ToolTipFix
     }

lib/scripts/scroll_view.patch

@@ -0,0 +1,73 @@
+diff --git a/packages/flutter/lib/src/widgets/scrollable.dart b/packages/flutter/lib/src/widgets/scrollable.dart
+index ac854f7de8f..fdeba1a88f5 100644
+--- a/packages/flutter/lib/src/widgets/scrollable.dart
++++ b/packages/flutter/lib/src/widgets/scrollable.dart
+@@ -786,11 +786,13 @@ class ScrollableState extends State<Scrollable>
+       switch (widget.axis) {
+         case Axis.vertical:
+           _gestureRecognizers = <Type, GestureRecognizerFactory>{
+-            VerticalDragGestureRecognizer:
+-                GestureRecognizerFactoryWithHandlers<VerticalDragGestureRecognizer>(
+-                  () => VerticalDragGestureRecognizer(supportedDevices: _configuration.dragDevices),
+-                  (VerticalDragGestureRecognizer instance) {
++            _VerticalDragGestureRecognizer:
++                GestureRecognizerFactoryWithHandlers<_VerticalDragGestureRecognizer>(
++                  () =>
++                      _VerticalDragGestureRecognizer(supportedDevices: _configuration.dragDevices),
++                  (_VerticalDragGestureRecognizer instance) {
+                     instance
++                      ..isDyAllowed = _isDyAllowed
+                       ..onDown = _handleDragDown
+                       ..onStart = _handleDragStart
+                       ..onUpdate = _handleDragUpdate
+@@ -859,6 +861,10 @@ class ScrollableState extends State<Scrollable>
+   Drag? _drag;
+   ScrollHoldController? _hold;
+ 
++  bool _isDyAllowed(double dy) {
++    return position.viewportDimension - dy > 30;
++  }
++
+   void _handleDragDown(DragDownDetails details) {
+     assert(_drag == null);
+     assert(_hold == null);
+@@ -2553,3 +2559,39 @@ class _HorizontalInnerDimensionState extends ScrollableState {
+     return _configuration.buildOverscrollIndicator(context, child, details);
+   }
+ }
++
++typedef IsDyAllowed = bool Function(double dy);
++
++class _VerticalDragGestureRecognizer extends VerticalDragGestureRecognizer {
++  _VerticalDragGestureRecognizer({
++    super.debugOwner,
++    super.supportedDevices,
++    super.allowedButtonsFilter,
++  });
++
++  IsDyAllowed? isDyAllowed;
++
++  bool _isDyAllowed = true;
++
++  @override
++  bool isPointerAllowed(PointerEvent event) {
++    _isDyAllowed = isDyAllowed?.call(event.localPosition.dy) ?? true;
++    return super.isPointerAllowed(event);
++  }
++
++  @override
++  T? invokeCallback<T>(
++    String name,
++    RecognizerCallback<T> callback, {
++    String Function()? debugReport,
++  }) {
++    if (!_isDyAllowed) return null;
++    return super.invokeCallback(name, callback, debugReport: debugReport);
++  }
++
++  @override
++  void dispose() {
++    isDyAllowed = null;
++    super.dispose();
++  }
++}