public void ContentDiggProviders()
{
var provider = new ContentDiggPool();
var digger = new ContentDigger((so, si) => si);
provider.Add(digger);
var content = new Content <Stream>();
provider.Use(content, content);
}
public virtual IVisual VisualOfTransferData(IGraph <IVisual, IVisualEdge> graph, ITransferData data)
{
var value = data.GetValue(TransferDataType.FromType(typeof(IVisual)));
var bytes = value as byte [];
if (bytes != null)
{
return(TransferDataSource.DeserializeValue(bytes) as IVisual);
}
#if TRACE
var dt = "";
data.DataTypes.ForEach(d => dt += d.Id + " | ");
Trace.WriteLine($"{nameof(DragDropViz)}.{nameof (VisualOfTransferData)}\t{dt}");
#endif
Stream stream = null;
Content <Stream> content = null;
string desc = null;
string source = null;
Func <ContentInfo, Stream, Content <Stream> > fillContent = (i, s) => {
bool newContent = content == null || s != content.Data;
var content1 = new Content <Stream> (content)
{
Data = newContent ? s : content.Data,
ContentType = newContent ? i.ContentType : content.ContentType,
Compression = newContent ? i.Compression : content.Compression,
};
content1 = ContentDiggPool.Use(content1);
desc = desc ?? content1?.Description?.ToString();
source = source ?? content1?.Source?.ToString();
return(content1);
};
if (data.Uris.Length > 0)
{
//TODO: handle more then one file
foreach (var uri in data.Uris.OrderBy(n => n.ToString()))
{
IContentIo <Stream> sink = null;
string uridesc = null;
if (uri.IsFile)
{
var fileName = IoUtils.UriToFileName(uri);
if (File.Exists(fileName)) // TODO: check if filename is directory
{
stream = File.OpenRead(fileName);
sink = DataManager.SinkOf(Path.GetExtension(fileName).TrimStart('.').ToLower());
uridesc = Path.GetFileNameWithoutExtension(fileName);
}
}
else if (uri.HostNameType == UriHostNameType.Dns)
{
try {
using (var cli = new WebClient()) {
bytes = cli.DownloadData(uri);
stream = new MemoryStream(bytes);
}
uridesc = uri.ToString();
} catch (Exception webEx) {
Registry.Pooled <IMessageBoxShow> ().Show("Download failed",
$"The uri \n{uri.ToString ()}\ncould not be loaded: {webEx.Message}", MessageBoxButtons.Ok);
}
}
if (stream != null)
{
ContentInfo info = null;
if (sink == null)
{
sink = DataManager.SinkOf(stream);
}
if (sink != null)
{
info = sink.Use(stream);
}
if (sink == null)
{
info = new ContentInfo("Unknown", ContentTypes.Unknown, "*", null, CompressionType.neverCompress);
}
content = fillContent(info, stream);
if (content.Description == null)
{
content.Description = uridesc;
}
content.Source = uridesc;
if (data.Uris.Length > 1)
{
Registry.Pooled <IMessageBoxShow> ().Show("DragDrop multiple files",
string.Format("Only one file {0} will be stored currently", uri.AbsolutePath), MessageBoxButtons.Ok);
}
break;
}
}
}
else
{
var dataTypes = data.DataTypes.ToArray();
if (data.Text != null)
{
using (var dr = new StringReader(data.Text))
desc = dr.ReadLine();
}
foreach (var s in DataManager.SinksOf(dataTypes).ToArray())
{
var transferType = s.Item1;
value = data.GetValue(transferType);
var sink = s.Item2;
stream = value as Stream;
bytes = value as byte [];
if (bytes != null)
{
stream = new MemoryStream(bytes);
}
var text = value as string;
if (text != null)
{
stream = text.AsUnicodeStream();
}
if (stream != null)
{
var info = sink.Use(stream);
var contentSpec = sink.Detector;
if (info == null && contentSpec != null)
{
info = contentSpec.FindMime(s.Item1.Id);
}
if (info == null)
{
info = DataManager.InfoOf(sink, dataTypes).FirstOrDefault();
}
if (info != null && content == null || content.Data == null)
{
content = fillContent(info, stream);
// TODO: find a better handling of preferences; maybe MimeFingerPrints does the job?
if (content.Data == null || desc == null || source == null)
{
continue;
}
}
else if (info != null)
{
fillContent(info, stream);
if (desc == null || source == null)
{
continue;
}
}
if (content != null)
{
if (content.Description == null)
{
content.Description = desc;
}
if (content.Source == null)
{
content.Source = source;
}
}
}
}
}
if (content != null)
{
#if TRACE
Trace.WriteLine($"{nameof (VisualOfTransferData)}\tDragged:\t{content.ContentType.MimeType ()}");
#endif
var result = VisualContentViz.VisualOfContent(graph, content);
if (stream is FileStream)
{
stream.Close();
}
return(result);
}
return(null);
}