/// <summary>
/// Performs preview loading on images.
/// </summary>
/// <param name="ownerViewModel">The owner view model.</param>
/// <param name="cancelToken">The cancel token.</param>
private async Task LoadPreviewContentImagesAsync(FolderViewModel ownerViewModel, CancellationToken cancelToken)
{
// Load all details
Dictionary<string, object> loadedFiles = new Dictionary<string, object>();
// Load all thumbnails
int loadedThumbnailCount = 0;
foreach (string actFileName in Directory.GetFiles(ownerViewModel.BasePath, Constants.BROWSING_SEARCH_PATTERN_THUMBNAIL))
{
// Do only load supported formats
if (Array.IndexOf(Constants.SUPPORTED_IMAGE_FORMATS, Path.GetExtension(actFileName)) < 0)
{
continue;
}
// Load the bitmap
ImageViewModel actThumbnailVM = new ImageViewModel();
actThumbnailVM.FilePath = actFileName;
ownerViewModel.ThumbnailViewModels.Add(actThumbnailVM);
loadedThumbnailCount++;
// Register currently loaded file
loadedFiles[actFileName] = null;
}
// Handle all remaining files
foreach (string actFileName in
Directory.GetFiles(ownerViewModel.BasePath)
.OrderBy((actPath) => actPath))
{
if (loadedFiles.ContainsKey(actFileName)) { continue; }
// Handle images
if (Array.IndexOf(Constants.SUPPORTED_IMAGE_FORMATS, Path.GetExtension(actFileName)) >= 0)
{
// Load the bitmap
m_fullViewsPreview.Add(new ImageViewModel() { FilePath = actFileName });
continue;
}
}
// Take some images from full-size collection if there are no explicit thumbnails
if ((loadedThumbnailCount == 0) &&
(m_fullViewsPreview.Count > 0))
{
ImageViewModel[] fullImages = m_fullViewsPreview.OfType<ImageViewModel>().ToArray();
if (fullImages.Length > 0)
{
List<int> takenRandomValues = new List<int>();
for (int loop = 0; loop < 5 && loop < fullImages.Length; loop++)
{
int nextRandom = Constants.UI_RANDOMIZER.Next(0, fullImages.Length);
while(takenRandomValues.Contains(nextRandom))
{
nextRandom = Constants.UI_RANDOMIZER.Next(0, fullImages.Length);
}
ownerViewModel.ThumbnailViewModels.Add(
fullImages[nextRandom]);
}
}
}
// Preload thumbnail images
foreach (ImageViewModel actThumbnailVM in ownerViewModel.ThumbnailViewModels.OfType<ImageViewModel>())
{
await actThumbnailVM.PreloadAsync(Constants.THUMBNAIL_WDITH, Constants.THUMBNAIL_HEIGHT);
// Cancel here if cancellation is requested
if (cancelToken.IsCancellationRequested) { return; }
}
}
/// <summary>
/// Performs preview loading on videos.
/// </summary>
/// <param name="ownerViewModel">The owner view model.</param>
private void LoadPreviewContentVideos(FolderViewModel ownerViewModel)
{
// Load all thumbnails
foreach (string actFileName in Directory.GetFiles(ownerViewModel.BasePath))
{
// Do only load supported formats
if (Array.IndexOf(Constants.SUPPORTED_VIDEO_FORMATS, Path.GetExtension(actFileName)) < 0)
{
continue;
}
// Load the bitmap
VideoViewModel videoVM = new VideoViewModel();
videoVM.VideoUri = new Uri(actFileName, UriKind.Absolute);
// Register currently loaded file
m_fullViewsPreview.Add(videoVM);
}
}
/// <summary>
/// Loads all folder contents.
/// </summary>
/// <param name="cancelToken">The cancellation token.</param>
protected override async Task LoadDetailContentInternalAsync(CancellationToken cancelToken)
{
if (string.IsNullOrEmpty(m_basePath)) { return; }
string[] subdirectories = Directory.Exists(m_basePath) ? Directory.GetDirectories(m_basePath) : new string[0];
base.HasBigSizeChildren = subdirectories.Length <= Constants.MAX_SUBITEM_COUNT_FOR_BIG_TILES;
// Load all subfolders folder-by-folder
// Trigger loading of the description (image, displayname, ...) before coninuing with next one
List<FolderViewModel> foundSubdirectories = new List<FolderViewModel>();
foreach (string actSubdirectory in subdirectories)
{
FolderViewModel actSubdirVM = new FolderViewModel(this, actSubdirectory);
foundSubdirectories.Add(actSubdirVM);
await actSubdirVM.LoadPreviewContentAsync(cancelToken);
await Task.Delay(Constants.BROWSING_DELAY_TIME_PER_FOLDER_LOAD_MS);
base.SubViewModels.Add(actSubdirVM);
// Return here if cancellation is requested
if (cancelToken.IsCancellationRequested) { return; }
}
}