public static FrameworkElement GetItemContainer(ItemsControl ItemsControl,
Visual BottomMostVisual)
{
FrameworkElement itemContainer = null;
if (ItemsControl != null && BottomMostVisual != null && ItemsControl.Items.Count >= 1)
{
var firstContainer = ItemsControl.ItemContainerGenerator.ContainerFromIndex(0);
if (firstContainer == null)
{
return(itemContainer); // retyrn null;
}
itemContainer = DynamicFormUtilities.FindAncestor(firstContainer.GetType(),
BottomMostVisual);
if (itemContainer == null || itemContainer.DataContext == null)
{
return(itemContainer);
}
var itemContainerVerify = ItemsControl.ItemContainerGenerator.ContainerFromItem(itemContainer.
DataContext) as FrameworkElement;
if (itemContainer != itemContainerVerify)
{
return(null);
}
}
return(itemContainer);
}
private void DragSource_PreviewMouseLeftButtonDown(object sender,
MouseButtonEventArgs e)
{
var fe = DynamicFormUtilities.GetItemContainer(sender as ItemsControl,
e.OriginalSource as
Visual) as FrameworkElement;
if (fe != null && fe.DataContext is PropertyInformation &&
(fe.DataContext as PropertyInformation
).HasBeenUsed)
{
e.Handled = true;
return;
}
InitialMousePosition = e.GetPosition(TopWindow);
SourceItemsControl = (ItemsControl)sender;
TopWindow = DynamicFormUtilities.FindAncestor(typeof(Window),
SourceItemsControl) as Window;
SourceItemContainer = DynamicFormUtilities.GetItemContainer(
SourceItemsControl, e.OriginalSource
as Visual);
if (SourceItemContainer != null)
{
DraggedData = SourceItemContainer.DataContext;
}
}