private void View_MultiDrawingItemAdding(object sender, MultiDrawingItemEventArgs e)
{
HistoryMemento memento = new HistoryMementoAddMultiDrawingItem(frameServer.Metadata, e.Manager, e.Item.Id);
frameServer.Metadata.AddMultidrawingItem(e.Manager, e.Item);
historyStack.PushNewCommand(memento);
}
public override HistoryMemento PerformUndo()
{
HistoryMemento redoMemento = new HistoryMementoAddMultiDrawingItem(metadata, manager, itemId);
redoMemento.CommandName = commandName;
AbstractMultiDrawingItem item = MultiDrawingItemSerializer.DeserializeMemento(data, metadata);
metadata.AddMultidrawingItem(manager, item);
// TODO: re instate the associated trackable drawing.
return(redoMemento);
}