public override void OnApplyTemplate()
{
base.OnApplyTemplate();
this.AddValueChanged(TreeViewItemEx.IsDraggingOverProperty, (o, e) =>
{
TreeViewItemEx tvItem = o as TreeViewItemEx;
if (tvItem.IsDraggingOver && ExpandIfDragOver)
{
DispatcherTimer dispatcherTimer = new DispatcherTimer();
EventHandler onTick = null;
onTick = (o1, e1) =>
{
if (tvItem.IsDraggingOver)
{
tvItem.SetValue(TreeViewItem.IsExpandedProperty, true);
}
dispatcherTimer.Tick -= onTick;
dispatcherTimer.Stop();
};
dispatcherTimer.Tick += onTick;
dispatcherTimer.Interval = new TimeSpan(0, 0, 1);
dispatcherTimer.Start();
}
});
}
public TreeViewItemEx()
{
this.AddHandler(TreeViewItem.SelectedEvent, new RoutedEventHandler(
(RoutedEventHandler) delegate(object obj, RoutedEventArgs args)
{
if (args.OriginalSource is TreeViewItem)
{
(args.OriginalSource as TreeViewItem).BringIntoView();
}
}));
this.AddValueChanged(TreeViewItemEx.IsBringIntoViewProperty, (o, e) =>
{
TreeViewItemEx tvItem = o as TreeViewItemEx;
if (tvItem.IsBringIntoView)
{
this.BringIntoView();
tvItem.IsBringIntoView = false;
}
});
}