void AssociatedObject_DragOver(object sender, DragEventArgs e)
{
var update = false;
var isAboveElement = false;
UIElement droppedOverItem = null;
try
{
e.Handled = true;
if (_dataType == null)
{
return;
}
if (!e.Data.GetDataPresent(_dataType))
{
return;
}
SetDragDropEffects(e);
if (_insertAdornerManager == null)
{
return;
}
var dropContainer = sender as DataGrid;
if (dropContainer == null)
{
return;
}
droppedOverItem = UIHelper.GetUIElement(dropContainer, e.GetPosition(dropContainer));
if (droppedOverItem == null)
{
return;
}
isAboveElement = UIHelper.IsPositionAboveElement(droppedOverItem, e.GetPosition(droppedOverItem));
update = true;
}
finally
{
if (_insertAdornerManager != null)
{
if (update)
{
_insertAdornerManager.Update(droppedOverItem, isAboveElement);
}
else
{
_insertAdornerManager.Clear();
}
}
}
}
private void AtDragOver(object sender, DragEventArgs e)
{
if (_dataType != null)
{
if (e.Data.GetDataPresent(_dataType))
{
SetDragDropEffects(e);
if (_insertAdornerManager != null)
{
var dropContainer = (ItemsControl)sender;
var droppedOverItem = UIHelper.GetUIElement(dropContainer, e.GetPosition(dropContainer));
var isAboveElement = UIHelper.IsPositionAboveElement(droppedOverItem, e.GetPosition(droppedOverItem));
_insertAdornerManager.Update(droppedOverItem, isAboveElement);
}
}
}
e.Handled = true;
}
