void _listCollectionView_CurrentChanged(object sender, EventArgs e)
{
var item = ListCollectionView.CurrentItem as ItemViewModel;
CurrentItemIndex = item == null ? -1 : _listItems.IndexOf(item) + 1;
if (EnableBackdropsForCurrentItem)
{
if (item != null)
{
_presentationManager.SetBackdrops(item.Item);
}
}
lock (_syncLock)
{
if (_selectionChangeTimer == null)
{
_selectionChangeTimer = new Timer(OnSelectionTimerFired, null, 300, Timeout.Infinite);
}
else
{
_selectionChangeTimer.Change(300, Timeout.Infinite);
}
}
}
private void EnsureActiveStreamIsVisible()
{
var xxx = _listItems.FirstOrDefault(i => i.IsActive);
var activeItemIndex = _listItems.IndexOf(_listItems.FirstOrDefault(i => i.IsActive));
Debug.WriteLine(String.Format("Ensure Active Stream is Visible {0} {1}", xxx.Name, activeItemIndex));
_presentationManager.Window.Dispatcher.InvokeAsync(() => ListCollectionView.MoveCurrentToPosition(activeItemIndex));
}
private IObservable <bool> CanMoveupObservable()
{
return(_right.ObserveCollectionChanged()
.SelectMany(ObserveColumnProperties(_right))
.Select(x =>
{
var selectedItems = _right.Where(y => y.IsSelected)
.ToArray();
if (selectedItems.Length == 1)
{
var selectedIndex = _right.IndexOf(selectedItems[0]);
return selectedIndex != 0;
}
return false;
}));
}
public int IndexOf(ICanvasObject child) => children.IndexOf(child);