private IncrementalUpdater FindUpdater()
{
if (this.updater != null)
{
return(this.updater);
}
DependencyObject ancestor = this.associatedObject;
while (ancestor != null)
{
DependencyObject parent = VisualTreeHelper.GetParent(ancestor);
ListViewBase listView = parent as ListViewBase;
if (listView != null)
{
IncrementalUpdater currentUpdater = IncrementalUpdateBehavior.GetIncrementalUpdater(listView);
if (currentUpdater == null)
{
currentUpdater = new IncrementalUpdater();
IncrementalUpdateBehavior.SetIncrementalUpdater(listView, currentUpdater);
}
return(currentUpdater);
}
ancestor = parent;
}
return(null);
}
private static void OnPhaseChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
{
IncrementalUpdateBehavior behavior = (IncrementalUpdateBehavior)sender;
IncrementalUpdater incrementalUpdater = behavior.FindUpdater();
FrameworkElement frameworkElement = behavior.associatedObject as FrameworkElement;
if (incrementalUpdater != null && frameworkElement != null)
{
incrementalUpdater.UncachePhaseElement(frameworkElement, (int)args.OldValue);
incrementalUpdater.CachePhaseElement(frameworkElement, (int)args.NewValue);
}
}
