private void DragLeave(object sender, DragEventArgs e)
{
if (sender is FrameworkElement fe)
{
DropBinding.ClearAdorners();
}
}
private void Drop(object sender, DragEventArgs e)
{
if (sender is FrameworkElement fe)
{
DropBinding.ClearAdorners();
var draggedItem = e.Data.GetData(instanceType);
if (draggedItem == null)
{
return;
}
var target = fe.DataContext;
if (target == null || !items.Contains(target))
{
return;
}
if (items.Contains(draggedItem))
{
items.Remove(draggedItem);
}
e.Effects = DragDropEffects.Copy;
var index = items.IndexOf(target) + (DropTypeByPosition(e, fe) == DropAdornerKind.Bottom ? 1 : 0);
items.Insert(index, draggedItem);
}
}
private void DragOver(object sender, DragEventArgs e)
{
if (sender is FrameworkElement fe)
{
DropBinding.ClearAdorners();
if (e.Data.GetData(instanceType) == null)
{
e.Effects = DragDropEffects.None;
e.Handled = true;
return;
}
;
var dropAdornerKind = DropTypeByPosition(e, fe);
fe.Adorn(dropAdornerKind);
e.Effects = DragDropEffects.Copy;
e.Handled = true;
}
}