/// <summary>
/// Synchronizes the logical tree.
/// </summary>
/// <param name="e">The <see cref="System.Collections.Specialized.NotifyCollectionChangedEventArgs" /> instance containing the event data.</param>
private void SyncLogicalTree(NotifyCollectionChangedEventArgs e)
{
// In order to get DataContext and binding to work with the series, axes and annotations
// we add the items to the logical tree
if (e.NewItems != null)
{
foreach (var item in e.NewItems.OfType <ISetLogicalParent>())
{
item.SetParent(this);
}
LogicalChildren.AddRange(e.NewItems.OfType <ILogical>());
VisualChildren.AddRange(e.NewItems.OfType <IVisual>());
}
if (e.OldItems != null)
{
foreach (var item in e.OldItems.OfType <ISetLogicalParent>())
{
item.SetParent(null);
}
foreach (var item in e.OldItems)
{
LogicalChildren.Remove((ILogical)item);
VisualChildren.Remove((IVisual)item);
}
}
}
/// <summary>
/// Called when new containers are materialized for the <see cref="ItemsControl"/> by its
/// <see cref="ItemContainerGenerator"/>.
/// </summary>
/// <param name="e">The details of the containers.</param>
protected virtual void OnContainersMaterialized(ItemContainerEventArgs e)
{
var toAdd = new List <ILogical>();
foreach (var container in e.Containers)
{
// If the item is its own container, then it will be added to the logical tree when
// it was added to the Items collection.
if (container.ContainerControl != null && container.ContainerControl != container.Item)
{
toAdd.Add(container.ContainerControl);
}
}
LogicalChildren.AddRange(toAdd);
}
/// <summary>
/// Given a collection of items, adds those that are controls to the logical children.
/// </summary>
/// <param name="items">The items.</param>
private void AddControlItemsToLogicalChildren(IEnumerable items)
{
var toAdd = new List <ILogical>();
if (items != null)
{
foreach (var i in items)
{
var control = i as IControl;
if (control != null && !LogicalChildren.Contains(control))
{
toAdd.Add(control);
}
}
}
LogicalChildren.AddRange(toAdd);
}