internal bool IsVerticalOrientation()
{
if (_isVerticalOrientation.HasValue)
{
return(_isVerticalOrientation.Value);
}
Helpers.ItemsControlHelper ich = new Helpers.ItemsControlHelper(ListBox);
StackPanel itemsHost = ich.ItemsHost as StackPanel;
if (itemsHost != null)
{
_isVerticalOrientation = (itemsHost.Orientation == System.Windows.Controls.Orientation.Vertical);
return(_isVerticalOrientation.Value);
}
VirtualizingStackPanel panel2 = ich.ItemsHost as VirtualizingStackPanel;
_isVerticalOrientation = ((panel2 == null) || (panel2.Orientation == System.Windows.Controls.Orientation.Vertical));
return(_isVerticalOrientation.Value);
}
internal bool IsOnCurrentPage(ListBoxItem item)
{
var itemsHostRect = Rect.Empty;
var listBoxItemRect = Rect.Empty;
if (_visual == null)
{
Helpers.ItemsControlHelper ich = new Helpers.ItemsControlHelper(ListBox);
ScrollContentPresenter scp = ich.ScrollHost == null ? null : ich.ScrollHost.GetVisualDescendants().OfType <ScrollContentPresenter>().FirstOrDefault();
_visual = (ich.ScrollHost == null) ? null : ((scp == null) ? ((FrameworkElement)ich.ScrollHost) : ((FrameworkElement)scp));
}
if (_visual == null)
{
return(true);
}
itemsHostRect = new Rect(0.0, 0.0, _visual.ActualWidth, _visual.ActualHeight);
//ListBoxItem item = ListBox.ItemContainerGenerator.ContainerFromIndex(index) as ListBoxItem;
if (item == null)
{
listBoxItemRect = Rect.Empty;
return(false);
}
GeneralTransform transform = item.TransformToVisual(_visual);
listBoxItemRect = new Rect(transform.Transform(new Point()), transform.Transform(new Point(item.ActualWidth, item.ActualHeight)));
if (!this.IsVerticalOrientation())
{
return((itemsHostRect.Left <= listBoxItemRect.Left) && (listBoxItemRect.Right <= itemsHostRect.Right));
}
return((listBoxItemRect.Bottom + 100 >= itemsHostRect.Top) && (listBoxItemRect.Top - 100 <= itemsHostRect.Bottom));
//return ((itemsHostRect.Top <= listBoxItemRect.Bottom) && (listBoxItemRect.Top <= itemsHostRect.Bottom));
}