protected override void OnSelectedItemChanged(RoutedPropertyChangedEventArgs <object> e)
{
if (e.NewValue != null)
{
_selectItem = e.NewValue as TreeDateDemo;
}
else if (e.OldValue != null)
{
_selectItem = e.OldValue as TreeDateDemo;
}
else
{
_selectItem = null;
}
this.SelectText = _selectItem.Header;
foreach (var item in _coll)
{
if (item != _selectItem)
{
item.IsMouseLeftDown = true;
}
}
base.OnSelectedItemChanged(e);
}
protected override void OnMouseLeave(MouseEventArgs e)
{
if (_selectItem != null)
{
_selectItem.IsSelected = false;
this._selectItem = null;
}
_moveSnapshoot.Visibility = Visibility.Collapsed;
base.OnMouseLeave(e);
}
protected override void OnMouseLeftButtonUp(MouseButtonEventArgs e)
{
if (this._moveSnapshoot.Visibility == Visibility.Visible)
{
this._moveSnapshoot.Visibility = Visibility.Collapsed;
_selectItem.IsExpanded = false;
FrameworkElement viewItem = Mouse.DirectlyOver as FrameworkElement;
TreeViewItem it = null;
GetItemView(viewItem, ref it);
if (it == null)
{
return;
}
TreeDateDemo target = it.DataContext as TreeDateDemo;
if (target != null && target != _selectItem)
{
int odleIndex = _coll.IndexOf(_selectItem);
int newIndex = _coll.IndexOf(target);
_coll.Move(odleIndex, newIndex);
}
foreach (var item in _coll)
{
item.IsMouseLeftDown = false;
}
}
else
{
if (_selectItem.IsExpanded)
{
_selectItem.IsExpanded = false;
}
else
{
_selectItem.IsExpanded = true;
}
}
base.OnMouseLeftButtonUp(e);
}