observeFirstItem method
Observe the first child in sliver.
Note that the first child here is not the first child being displayed in sliver, and it may not be displayed.
Implementation
ListViewObserveDisplayingChildModel? observeFirstItem({
BuildContext? sliverContext,
}) {
final model = findCurrentFirstChildInfo(sliverContext: sliverContext);
if (model == null) return null;
return ListViewObserveDisplayingChildModel(
sliverList: model.sliver as RenderSliverMultiBoxAdaptor,
viewport: model.viewport,
index: model.index,
renderObject: model.renderObject,
);
}