public PlaceholderReplaceWA(VirtualizingObservableCollection <T> voc, T oldValue, T newValue, int index)
: base(VirtualActionThreadModelEnum.UseUIThread)
{
_VOC = new WeakReference(voc);
_OldValue = oldValue;
_NewValue = newValue;
_Index = index;
}
private async void DoRealPageGet(Object voc, ISourcePage <T> page, int pageOffset, int index, CancellationTokenSource cts)
{
//Debug.WriteLine("DoRealPageGet: pageOffset=" + pageOffset + " index=" + index);
VirtualizingObservableCollection <T> realVOC = (VirtualizingObservableCollection <T>)voc;
List <PlaceholderReplaceWA <T> > listOfReplaces = new List <PlaceholderReplaceWA <T> >();
if (realVOC != null)
{
if (cts.IsCancellationRequested)
{
return;
}
var data = await ProviderAsync.GetItemsAtAsync(pageOffset, page.ItemsPerPage, false);
if (cts.IsCancellationRequested)
{
return;
}
page.WiredDateTime = data.LoadedAt;
int i = 0;
foreach (var item in data.Items)
{
if (cts.IsCancellationRequested)
{
RemovePageRequest(page.Page);
return;
}
ClearOptimizations();
if (page.ReplaceNeeded(i))
{
var old = page.GetAt(i);
if (old == null)
{
}
ClearOptimizations();
//Debug.WriteLine("Replacing:" + old.ToString() + " with " + item.ToString());
page.ReplaceAt(i, old, item, null, null);
//VirtualizationManager.Instance.RunOnUI(new PlaceholderReplaceWA<T>(realVOC, old, item, pageOffset+i));
listOfReplaces.Add(new PlaceholderReplaceWA <T>(realVOC, old, item, pageOffset + i));
}
else
{
page.ReplaceAt(i, default(T), item, null, null);
}
i++;
}
}
page.PageFetchState = PageFetchStateEnum.Fetched;
ClearOptimizations();
foreach (var replace in listOfReplaces)
{
if (cts.IsCancellationRequested)
{
RemovePageRequest(page.Page);
return;
}
VirtualizationManager.Instance.RunOnUI(replace);
}
RemovePageRequest(page.Page);
}
/// <summary>
/// Initializes a new instance of the <see cref="T:System.Object"/> class.
/// </summary>
public Enumerator(VirtualizingObservableCollection <TT> baseCollection)
{
this.BaseCollection = baseCollection;
}
public BulkMode(VirtualizingObservableCollection <T> voc)
{
_voc = voc;
}
public ExecuteResetWA(VirtualizingObservableCollection <T> voc)
: base(VirtualActionThreadModelEnum.UseUIThread)
{
_VOC = new WeakReference(voc);
}