public void OnItemsReset2()
{
if (SpatialIndex != null)
{
SpatialIndex.ExtentChanged -= OnSpatialExtentChanged;
SpatialIndex.QueryInvalidated -= OnSpatialQueryInvalidated;
}
RealizedItems = null;
SpatialIndex = null;
PrivateIndex = null;
if (base.IsVirtualizing && base.IsItemsHost && base.ItemsOwner != null)
{
RealizedItems = new LinkedList <int>();
SpatialIndex = (base.ItemsOwner.ItemsSource as ISpatialItemsSource);
if (SpatialIndex == null)
{
PrivateIndex = new PrivateSpatialIndex();
PrivateIndex.Reset((base.ItemsOwner.Items != null) ? base.ItemsOwner.Items.Count : 0);
SpatialIndex = PrivateIndex;
}
SpatialIndex.ExtentChanged += OnSpatialExtentChanged;
SpatialIndex.QueryInvalidated += OnSpatialQueryInvalidated;
}
InvalidateReality();
InvalidateExtent();
}
/// <summary>
/// Resets and initializes our spatial indices when the items source has changed.
/// </summary>
private void OnItemsReset()
{
if (SpatialIndex != null)
{
SpatialIndex.ExtentChanged -= OnSpatialExtentChanged;
SpatialIndex.QueryInvalidated -= OnSpatialQueryInvalidated;
}
RealizedItems = null;
SpatialIndex = null;
PrivateIndex = null;
if (IsVirtualizing && IsItemsHost && ItemsOwner != null)
{
RealizedItems = new LinkedList<int>();
SpatialIndex = ItemsOwner.ItemsSource as ISpatialItemsSource;
if (SpatialIndex == null)
{
PrivateIndex = new PrivateSpatialIndex();
PrivateIndex.Reset(ItemsOwner.Items != null ? ItemsOwner.Items.Count : 0);
SpatialIndex = PrivateIndex;
}
SpatialIndex.ExtentChanged += OnSpatialExtentChanged;
SpatialIndex.QueryInvalidated += OnSpatialQueryInvalidated;
}
InvalidateReality();
InvalidateExtent();
}