private void CreateContainers()
{
var generator = Owner.ItemContainerGenerator;
if (Owner.Bounds.Size.IsDefault)
{
if ((Items.Count() > 0) && !_estimated)
{
PdmLogger.Log(0, PdmLogger.IndentEnum.In, $"Estimate {Id} Items:{Items} ");
var materialized = generator.Materialize(0, Items.ElementAt(0));
VirtualizingPanel.Children.Insert(0, materialized.ContainerControl);
materialized.ContainerControl.Measure(Size.Infinity);
VirtualizingAverages.AddContainerSize(GroupControl.TemplatedParent, Items.ElementAt(0), materialized.ContainerControl);
//VirtualizingPanel.Children.RemoveAt(0);
//generator.Dematerialize(0, 1);
//ItemsPresenter.InvalidateMeasure();
_estimated = true;
PdmLogger.Log(1, PdmLogger.IndentEnum.Out, $"Estimated {Id} Items:{Items} ");
}
}
else if (Items != null && VirtualizingPanel.IsAttachedToVisualTree)
{
_realizedChildren.AddChildren();
}
_estimatedSize = VirtualizingAverages.GetEstimatedExtent(GroupControl.TemplatedParent, Items, Vertical);
}
internal double AddOneChild(RealizedItemsInfo info)
{
var child = _generator.ContainerFromIndex(_info.Next);
if (child == null)
{
var materialized = _generator.Materialize(_info.Next, _items.ElementAt(_info.Next));
child = materialized.ContainerControl;
_panel.Children.Add(child);
child.Measure(Size.Infinity);
PdmLogger.Log(2, PdmLogger.IndentEnum.Nothing, $"Add new Item {child.DataContext} to {this} {_info._currentOffset:0.00}");
if (VirtualizingAverages.AddContainerSize(_groupControl.TemplatedParent, _items.ElementAt(_info.Next), child))
{
_owner.InvalidateMeasure();
}
}
else
{
if (child is GroupItem gi)
{
gi.Presenter?.InvalidateMeasure();
}
if (_id == 402)
{
}
child.Measure(Size.Infinity);
PdmLogger.Log(2, PdmLogger.IndentEnum.Nothing, $"Add old Item {child.DataContext} to {this} {_info._currentOffset:0.00}");
if (VirtualizingAverages.AddContainerSize(_groupControl.TemplatedParent, _items.ElementAt(_info.Next), child))
{
_owner.InvalidateMeasure();
}
}
return(_info.Vert ? child.DesiredSize.Height : child.DesiredSize.Width);
}
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);
}
