public void OnScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)
{
Console.WriteLine("on scrolll event");
if (psl.mDelegateOnScrollListener != null) // delegate
{
psl.mDelegateOnScrollListener.OnScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);
}
// get expected adapter or fail fast
IListAdapter adapter = psl.Adapter;
if (adapter == null || visibleItemCount == 0)
{
return; // nothing to do
}
Boolean isFirstVisibleItemSection =
isItemViewTypePinned(adapter, adapter.GetItemViewType(firstVisibleItem));
if (isFirstVisibleItemSection)
{
View sectionView = psl.GetChildAt(0);
if (sectionView.Top == psl.PaddingTop) // view sticks to the top, no need for pinned shadow
{
psl.destroyPinnedShadow();
}
else // section doesn't stick to the top, make sure we have a pinned shadow
{
psl.ensureShadowForPosition(firstVisibleItem, firstVisibleItem, visibleItemCount);
}
}
else // section is not at the first visible position
{
int sectionPosition = psl.findCurrentSectionPosition(firstVisibleItem);
if (sectionPosition > -1) // we have section position
{
psl.ensureShadowForPosition(sectionPosition, firstVisibleItem, visibleItemCount);
}
else // there is no section for the first visible item, destroy shadow
{
psl.destroyPinnedShadow();
}
}
}
