private string GetFilename(TdApi.File file, long id, AvatarSize size)
{
var s = (int)size;
var name = file == null ? _colorMapper[id] : id.ToString();
return($"avatar_{s}x{s}_{name}.jpg");
}
public IObservable <TdApi.File> LoadFile(TdApi.File file, int priority = 16)
{
bool downloadingNeeded = file.Local == null ||
!file.Local.IsDownloadingCompleted ||
file.Local.Path == null ||
!File.Exists(file.Local.Path);
if (downloadingNeeded)
{
bool isNew = false;
var subject = _files.GetOrAdd(file.Id, id =>
{
isNew = true;
return(new Subject <TdApi.File>());
});
return(isNew
? _agent.Execute(new TdApi.DownloadFile {
FileId = file.Id, Priority = (int)priority
})
.SelectMany(o => subject)
: subject);
}
return(Observable.Return(file));
}
private bool IsDownloadingNeeded(TdApi.File file)
{
return(file.Local == null ||
!file.Local.IsDownloadingCompleted ||
file.Local.Path == null ||
!File.Exists(file.Local.Path));
}
public IObservable <TdApi.File> LoadFile(TdApi.File file, LoadPriority priority)
{
if (IsDownloadingNeeded(file))
{
return(_agent.Execute(new TdApi.DownloadFile
{
FileId = file.Id,
Priority = (int)priority
})
.SelectSeq(downloading =>
{
return _agent.Updates
.OfType <TdApi.Update.UpdateFile>()
.Select(u => u.File)
.Where(f => f.Id == downloading.Id)
.TakeWhile(f => IsDownloadingNeeded(f));
})
.Concat(Observable.Defer(() => _agent.Execute(new TdApi.GetFile
{
FileId = file.Id
}))));
}
return(Observable.Return(file));
}
private IBitmap GetBitmap(TdApi.File file)
{
if (file?.Local?.Path != null && _cache.TryGetValue(file.Local.Path, out var bitmap))
{
return((IBitmap)bitmap);
}
return(null);
}
private IObservable <IBitmap> LoadBitmap(TdApi.File file)
{
if (file != null)
{
return(_fileLoader.LoadFile(file, LoadPriority.Max)
.FirstAsync(f => f.Local != null && f.Local.IsDownloadingCompleted)
.Select(f => GetBitmap(f.Local.Path)));
}
return(Observable.Return <Bitmap>(null));
}
private IBitmap GetBitmap(TdApi.File file, long id, AvatarSize size)
{
var filename = GetFilename(file, id, size);
if (_cache.TryGetValue(filename, out var bitmap))
{
return((IBitmap)bitmap);
}
return(null);
}
private IBitmap GetBitmap(TdApi.File file, int size)
{
if (file?.Local?.Path != null)
{
var resizedFilePath = GetResizedPath(file.Local.Path, size);
if (_cache.TryGetValue(resizedFilePath, out var bitmap))
{
return((IBitmap)bitmap);
}
}
return(null);
}
private IObservable <IBitmap> LoadBitmap(TdApi.File file, long id, AvatarSize size)
{
var filename = GetFilename(file, id, size);
if (file != null)
{
return(_fileLoader.LoadFile(file, LoadPriority.Max)
.FirstAsync(f => f.Local != null && f.Local.IsDownloadingCompleted)
.SelectMany(f => PrepareAvatar(f.Local.Path, (int)size, filename).ToObservable())
.SelectMany(path => CreateBitmap(path).ToObservable())
.Do(bitmap =>
{
_cache.Set(filename, bitmap, new MemoryCacheEntryOptions
{
Size = 1
});
}));
}
return(Observable.Return <Bitmap>(null));
}
public IObservable <IBitmap> LoadFile(TdApi.File file, LoadPriority priority)
{
return(_fileLoader.LoadFile(file, priority)
.FirstAsync(f => f.Local != null && f.Local.IsDownloadingCompleted)
.Select(f => new Bitmap(f.Local.Path)));
}
