void RecalculatePositionsAndScroll()
{
_updateScrollPosition = new Point((int)_scrollingService.ScrollPositionX, (int)_scrollingService.ScrollPositionY);
Point position = new Point(-_updateScrollPosition.X, -_updateScrollPosition.Y);
for (int idx = 0; idx < _itemViews.Count; ++idx)
{
UiView view = _itemViews[idx];
bool shouldRecalc = view.ShouldRecalc(false, false);
Rectangle bounds = shouldRecalc ? CalculateItemBounds(view) : view.Bounds;
Point size = bounds.Size;
if (_vertical)
{
bounds.Height = size.Y;
bounds.Y = position.Y + view.PositionParameters.Margin.Top;
position.Y = bounds.Bottom + view.PositionParameters.Margin.Bottom;
}
else
{
bounds.Width = size.X;
bounds.X = position.X + view.PositionParameters.Margin.Left;
position.X = bounds.Right + view.PositionParameters.Margin.Right;
}
if (shouldRecalc)
{
view.Bounds = bounds;
view.ViewUpdate(0);
}
else
{
Point offset = bounds.Location - view.Bounds.Location;
view.Move(offset);
}
_maxScroll = new Point(_updateScrollPosition.X + position.X, _updateScrollPosition.Y + position.Y);
}
}
void Recalculate()
{
_newItems.Clear();
lock (_items)
{
int count = _items.Count;
int added = 0;
int numberOfElements = 0;
int maxAdd = count == 0 ? _maxAddFirstTime : _maxAddOneTime;
for (int idx = 0; idx < count; ++idx)
{
object bind = _items.ElementAt(_reverse ? count - idx - 1 : idx);
UiView view;
_bindingToElement.TryGetValue(bind, out view);
if (view == null)
{
if (added < maxAdd)
{
DefinitionFile template;
if (_additionalTemplates == null || !_additionalTemplates.TryGetValue(bind.GetType(), out template))
{
template = _template;
}
view = (UiView)template.CreateInstance(Controller, bind);
_newItems.Add(view);
added++;
}
else
{
continue;
}
}
if (numberOfElements < _itemViews.Count)
{
_itemViews[numberOfElements] = view;
}
else
{
_itemViews.Add(view);
}
numberOfElements++;
}
if (_itemViews.Count > numberOfElements)
{
_itemViews.RemoveRange(numberOfElements, _itemViews.Count - numberOfElements);
}
}
for (int idx = 0; idx < _newItems.Count; ++idx)
{
UiView view = _newItems[idx];
lock (_childrenLock)
{
_bindingToElement.Add(view.Binding, view);
_children.Add(view);
}
view.Parent = this;
view.RegisterView();
view.ViewAdded();
view.ViewUpdate(0);
}
RecalculatePositionsAndScroll();
}