internal virtual void SetFirst(Vector scrollPos)
{
FirstInCache = VirtualizingAverages.GetStartIndex(_templatedParent, _panelOffset - _cache.GetBackCacheSize(_tempViewport, _tempAverageItem), _items, Vert);
_firstInView = VirtualizingAverages.GetStartIndex(_templatedParent, _panelOffset, _items, Vert);
_currentOffset = VirtualizingAverages.GetOffsetForIndex(_templatedParent, FirstInCache, _items, Vert);
_numInView = 0;
_numInCache = 0;
NumInFullView = 0;
var av = VirtualizingAverages.GetEstimatedAverage(_templatedParent, _items, Vert);
_tempAverageItem = Vert ? av.Height : av.Width;
}
internal override void SetFirst(Vector scrollPos)
{
_firstInView = (int)(Vert ? scrollPos.Y : scrollPos.X);
if (_items is IGroupingView gv)
{
_firstInView = gv.GetLocalItemPosition(_firstInView);
}
ScrollOffset = (int)(Vert ? scrollPos.Y : scrollPos.X) - _firstInView;
_currentOffset = VirtualizingAverages.GetOffsetForIndex(_templatedParent, _firstInView, _items, Vert);
FirstInCache = VirtualizingAverages.GetStartIndex(_templatedParent, _currentOffset - _cache.GetBackCacheSize(_tempViewport, _tempAverageItem), _items, Vert);
_currentOffset = VirtualizingAverages.GetOffsetForIndex(_templatedParent, FirstInCache, _items, Vert);
_numInView = 0;
_numInCache = 0;
NumInFullView = 0;
var av = VirtualizingAverages.GetEstimatedAverage(_templatedParent, _items, Vert);
_tempAverageItem = Vert ? av.Height : av.Width;
}
public override Size ArrangeOverride(Size finalSize)
{
PdmLogger.Log(0, PdmLogger.IndentEnum.In, $"Arrange Realized {_realizedChildren} {finalSize} {++_overrideCount} {Owner.Bounds}");
foreach (var container in _realizedChildren)
{
var control = container.ContainerControl;
var startOffset = VirtualizingAverages.GetOffsetForIndex(GroupControl.TemplatedParent, container.Index, Items, Vertical);
if (Vertical)
{
control.Arrange(new Rect(new Point(0, startOffset), new Size(finalSize.Width, control.DesiredSize.Height)));
}
else
{
control.Arrange(new Rect(new Point(startOffset, 0), new Size(control.DesiredSize.Width, finalSize.Height)));
}
}
Owner.Panel.Arrange(new Rect(finalSize));
PdmLogger.Log(1, PdmLogger.IndentEnum.Out, $"Arranged Realized {_realizedChildren} {finalSize} {_overrideCount} {Owner.Bounds}");
return(finalSize);
}