/// <summary>
/// This produces effectively the same display and automatic updating as AddObjSeq, but instead of immediately
/// building the display, it creates a LazyBox and LazyHookup which between them manage the process of
/// building the item displays only when they are needed.
/// </summary>
private ViewBuilder AddLazyObjSeq <T>(object target, Func <IEnumerable <T> > fetcher, Action <IReceivePropChanged> hookEventAction,
Action <IReceivePropChanged> unhookEventAction, Action <ViewBuilder, T> displayOneT, int tag) where T : class
{
var hookup = new LazyHookup <T>(target, m_destination, fetcher, hookEventAction, unhookEventAction,
displayOneT);
CurrentHookup = hookup;
hookup.Tag = tag;
var currentTs = fetcher();
if (currentTs.FirstOrDefault() == null)
{
return(this); // no need to insert anything, currently no items.
}
InsertBox(new LazyBox <T>(NestedBoxStyles, hookup, fetcher()));
return(this);
}
public LazyBox(AssembledStyles style, LazyHookup <T> hookup, IEnumerable <T> items) : base(style)
{
m_hookup = hookup;
m_items = new List <T>(items);
}
