private bool UpdateLayout()
{
HashSet <DataType> remain = new HashSet <DataType>();
foreach (var p in ChildrenInUse)
{
remain.Add(p.Key);
}
bool answer = false;
SVmain.BatchBegin();
treap.Query(treap.Count, new Action <Treap <DataType> .TreapNode>((o) =>
{
MyAbsoluteLayout.SetLayoutBounds(LBend, BarsLayoutMethod(o.QueryYOffset()).Item1);
ALmain.HeightRequest = o.QueryYOffset() + treap.itemHeight;
}));
if (treap.Count > 0)
{
double difference = 0;
int l = UponIndex(), r = DownIndex();
for (int i = l; i <= r; i++)
{
treap.Query(i, new Action <Treap <DataType> .TreapNode>((o) =>
{
var targetBound = BarsLayoutMethod(o.QueryYOffset());
GenericView view = null;
if (ChildrenInUse.ContainsKey(o.data))
{
view = ChildrenInUse[o.data];
remain.Remove(o.data);
if (i == (l + r) / 2 && view.Bounds != null)
{
difference = targetBound.Item1.Y - view.Bounds.Y;
}
}
else if (!answer)
{
answer = true;
view = GetGenericView();
view.Reset(o.data);
ChildrenInUse[o.data] = view;
}
if (view != null)
{
MyAbsoluteLayout.SetLayoutBounds(view, targetBound.Item1);
}
}));
}
if (difference != 0)
{
SVmain.MyScrollY += difference;
//SVmain.ScrollToAsync(SVmain.ScrollX, SVmain.ScrollY + difference /** 1.05*/, false);
}
}
foreach (var d in remain)
{
var v = ChildrenInUse[d];
ChildrenInUse.Remove(d);
v.Reset(null);
v.IsVisible = false;
AvaiableChildrenPool.Push(v);
}
SVmain.BatchCommit();
return(answer);
}
