public void Drop(FrameworkElement droppedElement, FrameworkElement dropContainer, Point mousePositionWithRespectToContainer)
{
// get the view model for the items that's being dropped.
NumberVm droppedVm = droppedElement.DataContext as NumberVm;
// get the view model into which we insert the dropped item.
TestVm testVm = dropContainer.DataContext as TestVm;
// get the insertion index
(_, int insertIdx) = dropContainer.GetVerticalOffsetAndInsertIdx(mousePositionWithRespectToContainer.Y);
// insert the item into the target view model.
testVm.TargetList.Insert(insertIdx, droppedVm);
}
public MainWindow()
{
InitializeComponent();
DataContext = new TestVm();
}
