public void Children(int folderRequestId,
string folder,
Dispatcher dispatch,
Func <int, FileEntry, int, bool> addEntry)
{
numFilesBeingFetched = 0;
ChildrenResource.ListRequest request = _service.Children.List(folder);
do
{
try
{
ChildList children = request.Fetch();
var expectedCount = children.Items.Count();
foreach (ChildReference child in children.Items)
{
do
{
lock (_thumbDownloaders)
{
if (_thumbDownloaders.Count < 12)
{
break;
}
}
System.Threading.Thread.Sleep(100);
} while (true);
var doContinue = true;
dispatch.Invoke(
new Action(() => { doContinue = addEntry(expectedCount, null, folderRequestId); }));
if (!doContinue)
{
break;
}
do
{
lock (this)
{
if (numFilesBeingFetched < 20)
{
break;
}
}
System.Threading.Thread.Sleep(100);
} while (true);
FilesResource.GetRequest getReq = _service.Files.Get(child.Id);
++numFilesBeingFetched;
getReq.FetchAsync((LazyResult <Google.Apis.Drive.v2.Data.File> response) =>
{
--numFilesBeingFetched;
Google.Apis.Drive.v2.Data.File file = response.GetResult();
doContinue = true;
dispatch.Invoke(
new Action(() => { doContinue = addEntry(expectedCount, null, folderRequestId); }));
if (!doContinue)
{
return;
}
//download thumbnail
if (file.ThumbnailLink != null)
{
if (_thumbCache.ContainsKey(file.Id))
{
dispatch.BeginInvoke(new Action(() =>
{
addEntry(expectedCount,
new FileEntry(file, _thumbCache[file.Id], file.AlternateLink),
folderRequestId);
}));
}
else
{
TaskCompletionSource <byte[]> thumbTaskSrc = null;
lock (_thumbDownloaders)
{
thumbTaskSrc = DownloadThumb(file.ThumbnailLink);
_thumbDownloaders.Add(thumbTaskSrc);
}
thumbTaskSrc.Task.ContinueWith(
(Task <byte[]> thumbTask) =>
{
if (thumbTask.Result != null)
{
dispatch.BeginInvoke(new Action(() =>
{
var thumb = new BitmapImage();
thumb.BeginInit();
thumb.StreamSource = new MemoryStream(thumbTask.Result);
thumb.EndInit();
if (!_thumbCache.ContainsKey(file.Id))
{
_thumbCache.Add(file.Id, thumb);
}
addEntry(expectedCount,
new FileEntry(file, thumb, file.AlternateLink),
folderRequestId);
}));
}
else
{
//thumbnails may be absent
dispatch.BeginInvoke(new Action(() =>
{
addEntry(expectedCount,
new FileEntry(file, GetFileIcon(file),
file.AlternateLink),
folderRequestId);
}));
}
lock (_thumbDownloaders)
_thumbDownloaders.Remove(thumbTaskSrc);
});
}
}
else
{
dispatch.BeginInvoke(new Action(() =>
{
addEntry(expectedCount,
new FileEntry(file, GetFileIcon(file), file.AlternateLink),
folderRequestId);
}));
}
});
}
request.PageToken = children.NextPageToken;
}
catch (Exception e)
{
Console.WriteLine("An error occurred: " + e.Message);
request.PageToken = null;
}
var doContinue2 = true;
dispatch.Invoke(new Action(() => { doContinue2 = addEntry(1, null, folderRequestId); //1 anything != 0
}));
if (!doContinue2)
{
break;
}
} while (!String.IsNullOrEmpty(request.PageToken));
}
