opt scroll view

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

lib/common/widgets/gesture/vertical_drag_gesture_recognizer.dart

@@ -0,0 +1,39 @@
+import 'package:flutter/gestures.dart'
+    show VerticalDragGestureRecognizer, PointerEvent, RecognizerCallback;
+
+typedef IsDyAllowed = bool Function(double dy);
+
+class CustomVerticalDragGestureRecognizer
+    extends VerticalDragGestureRecognizer {
+  CustomVerticalDragGestureRecognizer({
+    super.debugOwner,
+    super.supportedDevices,
+    super.allowedButtonsFilter,
+  });
+
+  IsDyAllowed? isDyAllowed;
+
+  bool _isDyAllowed = false;
+
+  @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();
+  }
+}