public static void InitDragDrop(this IOnDragDropListener listener,
InputElement element)
{
element.PointerPressed += async(_, e)
=> await DragDrop.DoDragDrop(e, new DataObject(), DragDropEffects.Copy);
element.AddHandler(DragDrop.DropEvent, Drop);
element.AddHandler(DragDrop.DragOverEvent, DragOver);
void DragOver(object?s, DragEventArgs?e)
{
if (e?.Data == null)
{
return;
}
listener.DragOver(s is InputElement el ? el : element, e);
}
void Drop(object?s, DragEventArgs?e)
{
if (e?.Data == null)
{
return;
}
listener.Drop(s is InputElement el ? el : element, e);
}
}