[scrollable_positioned_list] Added ItemScrollController.jumpToPixel and .currentScrollControllerOffset

packages/scrollable_positioned_list/lib/src/scrollable_positioned_list.dart

@@ -180,9 +180,15 @@ class ScrollablePositionedList extends StatefulWidget {
 class ItemScrollController {
   /// Whether any ScrollablePositionedList objects are attached this object.
   ///
-  /// If `false`, then [jumpTo] and [scrollTo] must not be called.
+  /// If `false`, then [jumpTo], [scrollTo] and [jumpToPixel] must not be called.
   bool get isAttached => _scrollableListState != null;
 
+  /// Returns the current [scrollController.offset].
+  /// Also see [jumpToPixel].
+  double get currentScrollControllerOffset {
+    return _scrollableListState!.primary.scrollController.offset;
+  }
+
   _ScrollablePositionedListState? _scrollableListState;
 
   /// Immediately, without animation, reconfigure the list so that the item at
@@ -245,6 +251,23 @@ class ItemScrollController {
     );
   }
 
+  /// Immediately jump the list to the provided [value] via [scrollController.jumpTo].
+  /// Also see [currentScrollControllerOffset].
+  void jumpToPixel(double value) {
+    _scrollableListState!.primary.scrollController.jumpTo(value);
+  }
+
+  /// Calls [primary.scrollController.animateTo] with the given values.
+  /// See [currentScrollControllerOffset] to get the current offset.
+  void scrollToPixel({
+    required double offset,
+    required Duration duration,
+    required Curve curve,
+  }) {
+    _scrollableListState!.primary.scrollController
+        .animateTo(offset, duration: duration, curve: curve);
+  }
+
   void _attach(_ScrollablePositionedListState scrollableListState) {
     assert(_scrollableListState == null);
     _scrollableListState = scrollableListState;