protected override DataTemplate SelectTemplateCore(object item, DependencyObject container) { var boh = DataTemplate.GetExtensionInstance(container as FrameworkElement); var presenter = container as ContentControl; if (presenter != null && item is TLDocument doc) { presenter.Content = new TLMessage { Media = new TLMessageMediaDocument { Document = doc } }; } if (item is TLMessage message) { item = message.Media; } if (item is TLMessageMediaEmpty) { return(EmptyTemplate); } else if (item is TLMessageMediaContact) { return(ContactTemplate); } else if (item is TLMessageMediaPhoto) { return(PhotoTemplate); } else if (item is TLMessageMediaGame) { return(GameTemplate); } else if (item is TLMessageMediaVenue) { return(VenueTemplate); } else if (item is TLMessageMediaGeo) { return(GeoPointTemplate); } else if (item is TLMessageMediaInvoice invoiceMedia) { if (invoiceMedia.HasPhoto && invoiceMedia.Photo != null) { return(InvoicePhotoTemplate); } return(InvoiceTemplate); } else if (item is TLMessageMediaDocument || item is TLDocument) { if (item is TLMessageMediaDocument documentMedia) { item = documentMedia.Document; } if (item is TLDocument document) { if (TLMessage.IsVoice(document)) { return(AudioTemplate); } else if (TLMessage.IsVideo(document)) { return(VideoTemplate); } else if (TLMessage.IsRoundVideo(document)) { return(RoundVideoTemplate); } else if (TLMessage.IsGif(document)) { return(GifTemplate); } else if (TLMessage.IsSticker(document)) { return(StickerTemplate); } else if (TLMessage.IsMusic(document)) { return(MusicTemplate); } // TODO: ??? //var externalDocument = documentMedia.Document as TLDocumentExternal; //if (externalDocument != null && TLMessage.IsGif(externalDocument)) //{ // return GifTemplate; //} if (document.Thumb != null && !(document.Thumb is TLPhotoSizeEmpty)) { return(DocumentThumbTemplate); } } return(DocumentTemplate); } else if (item is TLMessageMediaWebPage webpageMedia) { if (webpageMedia.WebPage is TLWebPageEmpty) { return(EmptyTemplate); } else if (webpageMedia.WebPage is TLWebPagePending) { return(EmptyTemplate); } else if (webpageMedia.WebPage is TLWebPage webpage) { /*if (TLMessage.IsGif(webpage.Document)) * { * return WebPageGifTemplate; * } * else * if (webpage.Document != null && webpage.Type.Equals("document", StringComparison.OrdinalIgnoreCase)) * { * return WebPageDocumentTemplate; * }*/ if (webpage.Document != null) { return(WebPageDocumentTemplate); } if (webpage.Photo != null && webpage.Type != null) { if (IsWebPagePhotoTemplate(webpage)) { return(WebPagePhotoTemplate); } return(WebPageSmallPhotoTemplate); } } return(WebPageTemplate); } else if (item is TLMessageMediaUnsupported) { return(UnsupportedTemplate); } return(null); }