protected virtual void InitializeIfNeeded()
{
if (isInitialized)
{
return;
}
scrollRect = this.GetComponent <ScrollRect>();
layoutRp.Subscribe(OnLayoutChanged);
scrollRect.OnValueChangedAsObservable()
.Select(pos => layoutRp.Value == Layout.Horizontal ? pos.x : pos.y)
.Pairwise()
.Subscribe(x =>
{
var val = x.Current - x.Previous;
if (val < 0)
{
OnScrollUp(-val);
}
else
{
OnScrollDown(val);
}
});
pool = new ListItemPool <T>(scrollRect.content, prototype.GetComponent <ListViewItem <T> >());
pool.AddTo(this);
pool.OnCreateItem
.Subscribe(x => items.Add(x));
pool.OnCreateItem
.Select(x => x.GetComponent <RectTransform>())
.Subscribe(SetItemLayout);
isInitialized = true;
}
