private ImageDataSource()
{
//Setup the dispatcher for the UI thread
_dispatcher = Windows.UI.Xaml.Window.Current.Dispatcher;
// 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
this.itemCache = new ItemCacheManager <ImageItem>(fetchDataCallback, 50);
this.itemCache.CacheChanged += ItemCache_CacheChanged;
}
// Handles a change notification for the list of files from the OS
private void ResetCollection()
{
// Unhook the old change notification
if (itemCache != null)
{
this.itemCache.CacheChanged -= ItemCache_CacheChanged;
}
// Create a new instance of the cache manager
this.itemCache = new ItemCacheManager <ImageItem>(fetchDataCallback, 50);
this.itemCache.CacheChanged += ItemCache_CacheChanged;
CollectionChanged?.Invoke(this, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
}
//Required for the IItemsRangeInfo interface
public void Dispose()
{
itemCache = null;
}
