public async Task LoadFolderContents(int imageSize, IProgress <int> progress, ICollection <MediaData> mediaDatas = null)
{
if (!StorageApplicationPermissions.FutureAccessList.ContainsItem("gallery"))
{
return;
}
ImageSize = imageSize;
_folder = await StorageApplicationPermissions.FutureAccessList.GetFolderAsync("gallery");
if (_folder != null)
{
// Time and log file query.
using (new DisposableLogger(GalleryLog.FileQueryBegin, (sw) => GalleryLog.FileQueryEnd(sw, FilesFound)))
{
var queryOptions = new QueryOptions(CommonFileQuery.DefaultQuery, FileTypes.Extensions)
{
FolderDepth = FolderDepth.Deep,
IndexerOption = IndexerOption.UseIndexerWhenAvailable,
};
// Sort results.
queryOptions.SortOrder.Clear();
var sortEntry = QueryUtils.GetSortEntryFromSettings();
queryOptions.SortOrder.Add(sortEntry);
// Prefetch thumbnails.
queryOptions.SetThumbnailPrefetch(ThumbnailMode.SingleItem, (uint)imageSize, ThumbnailOptions.UseCurrentScale);
queryOptions.SetPropertyPrefetch(PropertyPrefetchOptions.ImageProperties, new[] { "System.DateModified" });
// Create query.
_query = _folder.CreateFileQueryWithOptions(queryOptions);
// Register tracker.
_query.ContentsChanged += Query_ContentsChanged;
FilesFound = (int)await _query.GetItemCountAsync();
}
// Time and log file parsing.
using (new DisposableLogger(GalleryLog.FileParseBegin, (sw) => GalleryLog.FileParseEnd(sw, FilesFound)))
{
uint index = 0, stepSize = SettingsService.Instance.MediaLoadBatchSize;
var files = await _query.GetFilesAsync(index, stepSize);
index += stepSize;
while (files.Count != 0)
{
var fileTask = _query.GetFilesAsync(index, stepSize).AsTask();
for (var i = 0; i < files.Count; i++)
{
var mediaFile = files[i];
// Don't bother with files not supported by MIME.
if (!FileTypes.IsSupportedExtension(mediaFile.FileType))
{
continue;
}
if (mediaDatas == null)
{
await AddFileAsync(imageSize, mediaFile, false);
}
else
{
// Find mediaData in mediaDatas based on path of mediaFile.
var matchingMediaDatas = mediaDatas.Where(data => data?.Meta?.MediaFilePath?.Equals(mediaFile?.Path) ?? false).ToList();
var mediaData = matchingMediaDatas.FirstOrDefault();
if (mediaData is null)
{
// Track the lost media files.
_lostMediaFiles.Add(mediaFile);
continue;
}
if (mediaData.Meta is null)
{
continue;
}
if (string.IsNullOrEmpty(mediaData.Meta.MediaFilePath))
{
continue;
}
// Tell the mediaData which file belongs to it.
mediaData.MediaFile = mediaFile;
await AddFileAsync(imageSize, mediaFile, false, mediaData);
}
}
files = await fileTask;
index += stepSize;
// Report progress to UI.
progress?.Report(MediaDatas.Count);
}
}
// Register tracker.
RegisterFolderContentTracker();
// Run tracker once to pick up on any file changes since last application boot.
Query_ContentsChanged(_query, null);
}
}