public override void Dispose()
{
MPF.TryCleanupAndDispose(Value);
if (_dataDescriptor != null)
{
_dataDescriptor.Detach(OnPropertyChanged);
}
base.Dispose();
}
void Detach()
{
if (!string.IsNullOrEmpty(Property))
{
if (_dataDescriptor != null)
{
_dataDescriptor.Detach(OnPropertyChanged);
_dataDescriptor = null;
}
}
else
{
_bindingProperty.Detach(OnBindingValueChanged);
}
}
/// <summary>
/// Initializes the <see cref="ItemsControl.ItemsSource"/> property with the <see cref="SubItemsProvider"/>.
/// </summary>
/// <returns><c>true</c>, if the <see cref="ItemsControl.ItemsSource"/> property was changed by this method, else <c>false</c>.</returns>
protected virtual bool InitializeSubItemsSource()
{
SubItemsProvider sip = SubItemsProvider;
IEnumerable oldItemsSource = ItemsSource;
if (!_contextChangedAttached)
{
ContextChanged += OnContextChanged;
_contextChangedAttached = true;
}
if (_attachedContextSource != null)
{
_attachedContextSource.Detach(OnDataContextValueChanged);
}
_attachedContextSource = DataContext.EvaluatedSourceValue;
_attachedContextSource.Attach(OnDataContextValueChanged);
object context = Context;
if (context == null)
{
return(false);
}
ItemsSource = sip == null ? null : sip.GetSubItems(context);
if (oldItemsSource == ItemsSource)
{
return(false);
}
MPF.TryCleanupAndDispose(oldItemsSource);
CheckExpandable();
return(true);
}
public void Detach()
{
if (_attachedToSource)
{
_sourceDd.Detach(OnSourceChanged);
}
_attachedToSource = false;
if (_attachedToTarget)
{
_targetDd.Detach(OnTargetChanged);
}
_attachedToTarget = false;
if (_attachedToLostFocus != null)
{
_attachedToLostFocus.EventOccured -= OnTargetElementEventOccured;
}
}
/// <summary>
/// Will reset all change handler attachments to source property and
/// source path properties. This should be called before the evaluation path
/// to the binding's source will be processed again.
/// </summary>
protected void ResetChangeHandlerAttachments()
{
foreach (AbstractProperty property in _attachedPropertiesCollection)
{
property.Detach(OnDataContextChanged);
}
_attachedPropertiesCollection.Clear();
if (_attachedSource != null)
{
_attachedSource.Detach(OnBindingSourceChange);
_attachedSource = null;
}
if (_attachedSourceObservable != null)
{
_attachedSourceObservable.ObjectChanged -= OnBindingSourceChange;
_attachedSourceObservable = null;
}
}