private int GetNumInView(double scrollPos)
{
var last = (int)scrollPos;
RemoveOld();
if (RealizedIndex.TryGetValue((int)scrollPos, out var first))
{
var firstLocation = first.RelativeOffset;
foreach (var item in RealizedIndex)
{
var offset = item.Value.RelativeOffset - firstLocation;
var res = item.Value.Container.ContainerControl.TranslatePoint(new Point(0, 0), _panel);
if ((offset <= _scrollContentPresenter.DesiredSize.Height) && (last < item.Key))// Panel.DesiredSize.Height)
{
if (offset + item.Value.Container.ContainerControl.DesiredSize.Height <= _scrollContentPresenter.DesiredSize.Height)
{
last = item.Key;
}
else
{
last = item.Key - 1;
}
}
}
}
PdmLogger.Log(3, PdmLogger.IndentEnum.Nothing, $"LastInView02 {scrollPos} {last}");
return(last + 1 - (int)scrollPos);
}
/// <inheritdoc/>
protected override IControl CreateContainer(object item)
{
var container = item as GroupItem;
if (container != null)
{
return(container);
}
else
{
var itemsControl = Owner as ItemsControl;
var presenter = itemsControl.Presenter as ItemsPresenter;
var result = new GroupItem(itemsControl, (GroupingViewInternal)item);
PdmLogger.Log(4, PdmLogger.IndentEnum.Nothing, $"Create GroupItem {result.Id} from {Id} with {item}");
result.SetValue(GroupItem.TemplatedParentProperty, Owner, BindingPriority.TemplatedParent);
// result.GroupControl = _groupControl;
result.SetValue(GroupItem.ItemsPanelProperty, itemsControl.ItemsPanel);
result.ItemTemplate = itemsControl?.ItemTemplate;
if (presenter != null)
{
result.VirtualizationMode = presenter.VirtualizationMode;
result.VirtualizingCache = presenter.VirtualizingCache;
}
if (!(item is IControl))
{
result.DataContext = item;
}
return(result);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="GroupContainerGenerator"/> class.
/// </summary>
/// <param name="owner">The immediate owner of the control.</param>
public GroupContainerGenerator(ItemsControl owner)
: base(owner)
{
Contract.Requires <ArgumentNullException>(owner != null);
// _groupControl = new GroupController() { TemplatedParent = owner };
PdmLogger.Log(30, PdmLogger.IndentEnum.Nothing, $"Construct GroupContainerGenerator {Id} {_str} {++_gcount00}");
}
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);
}
public ItemVirtualizerSmooth(ItemsPresenter owner)
: base(owner)
{
Id = _idCount++;
_realizedChildren = new RealizedItems(Owner, GroupControl, Id);
PdmLogger.Log(30, PdmLogger.IndentEnum.Nothing, $"Constructing {Id}, {Items} {++_gcount}");
}
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);
}
public void RemoveChildren()
{
var toRemove = new List <ItemContainerInfo>();
foreach (var item in _generator.Containers)
{
if (_info.CheckForRemoval(item.Index))
{
toRemove.Add(item);
}
}
if (toRemove.Count != 0)
{
PdmLogger.Log(30, PdmLogger.IndentEnum.Nothing, $"RemoveChildren {this} Info {_info} {toRemove.Count}");
}
foreach (var toRem in toRemove)
{
foreach (var container in _generator.Dematerialize(toRem.Index, 1))
{
PdmLogger.Log(30, PdmLogger.IndentEnum.Nothing, $"Remove Child {container.ContainerControl}");
_panel.Children.Remove(container.ContainerControl);
_groupControl.RemoveItem(container.ContainerControl);
}
// _groupControl.RemoveGroup(toRem.Item);
}
}
public ItemVirtualizerLogical(ItemsPresenter owner)
: base(owner)
{
Id = _idCount++;
_realizedChildren = new RealizedItems(Owner, GroupControl, Id);
_scrollContentPresenter = Owner.FindAncestorOfType <ScrollContentPresenter>();
PdmLogger.Log(30, PdmLogger.IndentEnum.Nothing, $"Constructing {Id}, {Items} {++_gcount}");
}
public GroupItem(ItemsControl itemsControl, IGroupingView items)
{
if (itemsControl is GroupItem gi)
{
Level = gi.Level + 1;
}
Name = $"Level{Level,2:00}";
Id = _idCount++;
Items = items;
PdmLogger.Log(30, PdmLogger.IndentEnum.Nothing, $"Construct GroupItem {Id} {Items} {++_gcount}");
}
/// <summary>
/// Initializes a new instance of the <see cref="ItemContainerGenerator"/> class.
/// </summary>
/// <param name="owner">The owner control.</param>
public ItemContainerGenerator(IControl owner)
{
Contract.Requires <ArgumentNullException>(owner != null);
Owner = owner;
Id = _count++;
if (Owner is ItemsControl ic)
{
_str = $"{ic.Items}";
}
PdmLogger.Log(30, PdmLogger.IndentEnum.Nothing, $"Construct ItemContainerGenerator {Id} {_str} {++_gcount}");
}
/// <inheritdoc/>
public override void ItemsChanged(IEnumerable items, NotifyCollectionChangedEventArgs e)
{
PdmLogger.Log(2, PdmLogger.IndentEnum.Nothing, $"ItemsChanged {Id} Current Items {Items} New Items {items} ");
base.ItemsChanged(items, e);
if (e.Action != NotifyCollectionChangedAction.Add)
{
ItemContainerSync.ItemsChanged(Owner, null, e);
}
else
{
Owner.InvalidateMeasure();
}
}
/// <inheritdoc/>
public override Size MeasureOverride(Size availableSize)
{
PdmLogger.Log(0, PdmLogger.IndentEnum.In, $"Measure Realized {_realizedChildren} {availableSize} {++_measureCount} {!Owner.Bounds.Size.IsDefault}");
UpdateControls();
if (!_scrollViewer.Bounds.Size.IsDefault)
{
_realizedChildren.RemoveChildren();
}
PdmLogger.Log(1, PdmLogger.IndentEnum.Out, $"Measured Realized {_realizedChildren} {_estimatedSize} {_measureCount} {!Owner.Bounds.Size.IsDefault}");
if (VirtualizingPanel.ScrollDirection == Layout.Orientation.Vertical)
{
return(_estimatedSize);
}
return(_estimatedSize);
}
public void AddChildren()
{
// _groupControl.RemoveGroup(_items);
var numItems = _items.Count();
_info.SetPanelRelative(-_panel.TranslatePoint(new Point(0, 0), _scrollViewer).Value, _scrollViewer.Bounds.Size);
_info.SetFirst(_scrollViewer.Offset);
PdmLogger.Log(3, PdmLogger.IndentEnum.Nothing, $"BeforeAdd {this} {_info}");
while (_info.RealizeNeeded(numItems))
{
_info.AddOffset(AddOneChild(_info));
PdmLogger.Log(3, PdmLogger.IndentEnum.Nothing, $"Add Item {this} {_info}");
}
PdmLogger.Log(2, PdmLogger.IndentEnum.Nothing, $"AddChildren Realized {this} Info {_info} Scroller Height {_scrollViewer.Bounds.Height:0.00}");
// _groupControl.AddGroup(_info, _items, _generator);
}
private void RemoveOld()
{
// PdmLogger.Log(3, PdmLogger.IndentEnum.Nothing, $"Rem Group");
var toRemove = new List <int>();
foreach (var item in RealizedIndex)
{
if ((item.Value.Container == null) || (item.Value.Container.ContainerControl.Parent == null))
{
toRemove.Add(item.Key);
}
}
foreach (var item in toRemove)
{
PdmLogger.Log(3, PdmLogger.IndentEnum.Nothing, $"Rem Item02 {RealizedIndex[item].Container.ContainerControl.DataContext}");
RealizedIndex.Remove(item);
}
}
public void RemoveItem(IControl control)
{
PdmLogger.Log(3, PdmLogger.IndentEnum.Nothing, $"Rem Item");
var toRemove = new List <int>();
foreach (var item in RealizedIndex)
{
if (item.Value.Container.ContainerControl == control)
{
toRemove.Add(item.Key);
}
}
foreach (var item in toRemove)
{
PdmLogger.Log(3, PdmLogger.IndentEnum.Nothing, $"Rem Item00 {RealizedIndex[item].Container.ContainerControl.DataContext}");
RealizedIndex.Remove(item);
}
}
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);
}
internal void RemoveItems(IItemContainerGenerator itemContainerGenerator)
{
var toRemove = new List <int>();
foreach (var container in itemContainerGenerator.Containers)
{
foreach (var item in RealizedIndex)
{
if (item.Value.Container == container)
{
toRemove.Add(item.Key);
}
}
}
foreach (var item in toRemove)
{
PdmLogger.Log(3, PdmLogger.IndentEnum.Nothing, $"Rem Item01 {RealizedIndex[item].Container.ContainerControl.DataContext}");
RealizedIndex.Remove(item);
}
}
public ItemsPresenter()
{
Id = _idCount++;
PdmLogger.Log(30, PdmLogger.IndentEnum.Nothing, $"Constructing ItemsPresenter, {Id} {Items} {++_gcount}");
}
public ListBoxItem()
{
Id = _idCount++;
PdmLogger.Log(30, PdmLogger.IndentEnum.Nothing, $"Constructing ListBoxItem, {Id} {++_gcount}");
}
