/// <summary>
/// Gets the Orientation which will be used for the drag drop action.
/// Normally it will be look up to find the correct orientaion of the inner ItemsPanel,
/// but sometimes it's necessary to force the oreintation, if the look up is wrong.
/// If so, the ItemsPanelOrientation value is taken.
/// </summary>
/// <param name="itemsControl">The ItemsControl for the look up.</param>
/// <returns>Orientation for the given ItemsControl.</returns>
public static Orientation GetItemsPanelOrientation(this ItemsControl itemsControl)
{
var itemsPanelOrientation = DragDrop.GetItemsPanelOrientation(itemsControl);
if (itemsPanelOrientation.HasValue)
{
return(itemsPanelOrientation.Value);
}
if (itemsControl is TabControl)
{
//HitTestUtilities.HitTest4Type<TabPanel>(sender, elementPosition)
//var tabPanel = itemsControl.GetVisualDescendent<TabPanel>();
var tabControl = (TabControl)itemsControl;
return(tabControl.TabStripPlacement == Dock.Left || tabControl.TabStripPlacement == Dock.Right ? Orientation.Vertical : Orientation.Horizontal);
}
var itemsPresenter = itemsControl.GetVisualDescendent <ItemsPresenter>() ?? itemsControl.GetVisualDescendent <ScrollContentPresenter>() as UIElement;
if (itemsPresenter != null && VisualTreeHelper.GetChildrenCount(itemsPresenter) > 0)
{
var itemsPanel = VisualTreeHelper.GetChild(itemsPresenter, 0);
var orientationProperty = itemsPanel.GetType().GetProperty("Orientation", typeof(Orientation));
if (orientationProperty != null)
{
return((Orientation)orientationProperty.GetValue(itemsPanel, null));
}
}
// Make a guess!
return(Orientation.Vertical);
}
