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Allow listening to primary ScrollController #506

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Allow listening to primary ScrollController #506

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a4e185c
Allow listening to primary ScrollController
Lootwig Dec 12, 2023
a76bd71
fix: missing brace, remove redundant non-null assertion
Lootwig Dec 12, 2023
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10 changes: 10 additions & 0 deletions packages/scrollable_positioned_list/lib/src/scrollable_positioned_list.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,7 @@ class ScrollablePositionedList extends StatefulWidget {
this.addAutomaticKeepAlives = true,
this.addRepaintBoundaries = true,
this.minCacheExtent,
this.controllerListener,
}) : assert(itemCount != null),
assert(itemBuilder != null),
itemPositionsNotifier = itemPositionsListener as ItemPositionsNotifier?,
Expand Down Expand Up @@ -87,13 +88,18 @@ class ScrollablePositionedList extends StatefulWidget {
this.addAutomaticKeepAlives = true,
this.addRepaintBoundaries = true,
this.minCacheExtent,
this.controllerListener,
}) : assert(itemCount != null),
assert(itemBuilder != null),
assert(separatorBuilder != null),
itemPositionsNotifier = itemPositionsListener as ItemPositionsNotifier?,
scrollOffsetNotifier = scrollOffsetListener as ScrollOffsetNotifier?,
super(key: key);

/// Optional listener for the primary scroll controller.
/// Called once after first frame.
final void Function(ScrollController controller)? controllerListener;

/// Number of items the [itemBuilder] can produce.
final int itemCount;

Expand Down Expand Up @@ -345,8 +351,12 @@ class _ScrollablePositionedListState extends State<ScrollablePositionedList>
if (!_isTransitioning |
(widget.scrollOffsetNotifier?.recordProgrammaticScrolls ?? false)) {
widget.scrollOffsetNotifier?.changeController.add(offsetChange);
widget.controllerListener?.call(primary.scrollController);
}
});
WidgetsBinding.instance.addPostFrameCallback((_) {
widget.controllerListener?.call(primary.scrollController);
});
}

@override
Expand Down