public async void LoadImageAsync(int priority, EventHandler BitmapLoaded = null, CancellationTokenSource cancel = null)
{
if (BitmapLoaded != null)
{
_bitmapLoadedHandler = BitmapLoaded;
}
if ((IsImageLoaded && BitmapLoaded == null) || IsImageLoading)
{
if (_dataLoaderTask.Status == TaskStatus.RanToCompletion && BitmapLoaded != null)
{
try
{
Application.Current.Dispatcher.InvokeIfRequired(DispatcherPriority.Normal, new Action(() =>
{
if (_bitmapLoadedHandler != null)
{
_bitmapLoadedHandler(this, EventArgs.Empty);
}
}));
}
catch (Exception) { }
finally { _bitmapLoadedHandler = null; }
}
return;
}
lock (_lock) { _cancelImageLoad = (cancel != null) ? cancel : new CancellationTokenSource(); }
_dataLoaderTask = BblTask.Run(() => Book.LoadPageData(Index, _cancelImageLoad.Token), priority, _cancelImageLoad.Token);
try
{
await _dataLoaderTask;
if (_bitmapLoadedHandler != null)
{
try {
Application.Current.Dispatcher.InvokeIfRequired(DispatcherPriority.Normal, new Action(() =>
{
if (_bitmapLoadedHandler != null)
{
_bitmapLoadedHandler(this, EventArgs.Empty);
}
}));
}
catch (Exception) { }
finally { _bitmapLoadedHandler = null; }
}
try {
if (IsThumbnailLoaded == true && ThumbnailLoaded != null)
{
Application.Current.Dispatcher.InvokeIfRequired(DispatcherPriority.Normal, new Action(() =>
{
if (ThumbnailLoaded != null)
{
ThumbnailLoaded(this, new EventArgs());
}
}));
}
}
catch { }
}
catch
{
//if(!(e is InvalidOperationException && e.HResult == -2146233079))
lock (_lock)
{
if (Image != null)
{
Image.Dispose();
}
Image = null;
}
}
finally
{
lock (_lock)
{
_dataLoaderTask = null;
if (cancel == null)
{
_cancelImageLoad.Dispose();
_cancelImageLoad = null;
}
}
}
}
public async void PopulateAsync(int priority)
{
if (IsPopulating)
{
return;
}
if (IsPopulated && !IsPopulating)
{
if (IsThumbnailLoaded || IsThumbnailLoading)
{
Populated(this, new EventArgs());
}
else
{
LoadThumbnail(priority);
}
return;
}
_cancelPopulateTask = new CancellationTokenSource();
try
{
IProgress <bool> progress = new Progress <bool>((populated) =>
{
if (populated)
{
Populated(this, new EventArgs());
}
else
{
Root.OnBookOperation(new BookOperationData(this, BookOperations.Remove, null));
_demoted = true;
if (Demoted != null)
{
Demoted(this, new EventArgs());
}
}
});
await(_populateTask = BblTask.Run(() =>
{
try
{
_cancelPopulateTask.Token.ThrowIfCancellationRequested();
Populate();
_cancelPopulateTask.Token.ThrowIfCancellationRequested();
if (_pages != null && _pages.Count > 0)
{
DeserializeIVP();
progress.Report(true);
_pages[0].ThumbnailLoaded += OnThumbnailLoaded;
_pages[0].LoadImageAsync(priority);
}
else
{
UnPopulate();
progress.Report(false);
}
_cancelPopulateTask.Token.ThrowIfCancellationRequested();
}
catch /*(Exception e)*/ { UnPopulate(); }
finally
{
lock (_lock)
{
_populateTask = null;
if (_cancelPopulateTask != null)
{
_cancelPopulateTask.Dispose();
}
_cancelPopulateTask = null;
}
}
}
, priority, _cancelPopulateTask.Token));
}
catch
{
UnPopulate();
}
}