public CalendarItemList(Func <List <DateTime>, CancellationToken, Task <ICalendarItem[]> > fetchDataCallback)
{
// Setup the dispatcher for the UI thread
_dispatcher = Microsoft.UI.Xaml.Window.Current.Dispatcher;
_fetchDataCallback = (range, c) => fetchDataCallback(ConvertIndexRangeToDateTimeRange(range), c);
_pivotDay = DateTimeOffset.Now.Date;
// The ItemCacheManager does most of the heavy lifting. We pass it a callback that it will use to actually fetch data, and the max size of a request
itemCache = new ItemCacheManager <ICalendarItem>(_fetchDataCallback, 50);
itemCache.CacheChanged += ItemCache_CacheChanged;
}
private void ResetCollection()
{
// Unhook the old change notification
if (itemCache != null)
{
itemCache.CacheChanged -= ItemCache_CacheChanged;
}
// Create a new instance of the cache manager
itemCache = new ItemCacheManager <ICalendarItem>(_fetchDataCallback, 50);
itemCache.CacheChanged += ItemCache_CacheChanged;
if (CollectionChanged != null)
{
CollectionChanged(this, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset, null, null, 0, 0));
}
}