/// <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 the <see cref="Children"/> collection changes.
/// </summary>
/// <param name="sender">The event sender.</param>
/// <param name="e">The event args.</param>
protected virtual void ChildrenChanged(object sender, NotifyCollectionChangedEventArgs e)
{
List <Control> controls;
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
controls = e.NewItems.OfType <Control>().ToList();
LogicalChildren.InsertRange(e.NewStartingIndex, controls);
VisualChildren.AddRange(e.NewItems.OfType <Visual>());
break;
case NotifyCollectionChangedAction.Move:
LogicalChildren.MoveRange(e.OldStartingIndex, e.OldItems.Count, e.NewStartingIndex);
VisualChildren.MoveRange(e.OldStartingIndex, e.OldItems.Count, e.NewStartingIndex);
break;
case NotifyCollectionChangedAction.Remove:
controls = e.OldItems.OfType <Control>().ToList();
LogicalChildren.RemoveAll(controls);
VisualChildren.RemoveAll(e.OldItems.OfType <Visual>());
break;
case NotifyCollectionChangedAction.Replace:
for (var i = 0; i < e.OldItems.Count; ++i)
{
var index = i + e.OldStartingIndex;
var child = (IControl)e.NewItems[i];
LogicalChildren[index] = child;
VisualChildren[index] = child;
}
break;
case NotifyCollectionChangedAction.Reset:
throw new NotSupportedException();
}
InvalidateMeasure();
}
public void AddChildren(IEnumerable <Visual> v)
{
VisualChildren.AddRange(v);
}
