/// <summary>
/// Builds the list of pages
/// </summary>
private void BuildPageList()
{
Queue <DirmComponent> pageHeaders = new Queue <DirmComponent>(Directory.Components.Where(x => x.IsPage));
Queue <TH44Chunk> thumbnail = new Queue <TH44Chunk>(FormChunk.GetChildrenItems <TH44Chunk>());
DjviChunk[] sharedItems = FormChunk.GetChildrenItems <DjviChunk>();
List <DjvuPage> pages = new List <DjvuPage>();
int pageCount = 1;
foreach (IFFChunk child in FormChunk.Children)
{
if (child is FormChunk)
{
FormChunk form = (FormChunk)child;
if (form.Children.Any(x => x.ChunkType == ChunkTypes.Form_Djvu))
{
DirmComponent currentHeader = pageHeaders.Count() > 0 ? pageHeaders.Dequeue() : null;
TH44Chunk currentThumbnail = thumbnail.Count() > 0 ? thumbnail.Dequeue() : null;
DjvuPage newPage = new DjvuPage(pageCount++, this, currentHeader, currentThumbnail, sharedItems, form);
pages.Add(newPage);
}
}
}
Pages = pages.ToArray();
}
public DjvuPage(int pageNumber, DjvuDocument document, DirmComponent header, TH44Chunk thumbnail, DjviChunk[] includedItems, FormChunk form)
{
PageNumber = pageNumber;
Document = document;
Header = header;
Thumbnail = thumbnail;
IncludedItems = includedItems;
PageForm = form;
}
/// <summary>
/// Gets a chunk type by the given ID
/// </summary>
/// <typeparam name="TItem"></typeparam>
/// <param name="ID"></param>
/// <returns></returns>
public TItem GetChunkByID <TItem>(string ID) where TItem : IFFChunk
{
if (Directory == null)
{
return(null);
}
DirmComponent component = Directory.Components.FirstOrDefault(x => x.ID == ID);
if (component == null)
{
return(null);
}
TItem[] children = FormChunk.GetChildrenItems <TItem>().ToArray();
TItem child = children.Where(x => x.Offset - 8 == component.Offset).FirstOrDefault();
return(child);
}
public DjvuPage(int pageNumber, IDjvuDocument document, DirmComponent header,
ITH44Chunk thumbnail, IReadOnlyList<IDjviChunk> includedItems, DjvuFormElement form)
{
PageNumber = pageNumber;
Document = document;
Header = header;
Thumbnail = thumbnail;
IncludeFiles = includedItems;
PageForm = form;
_DjvuImage = new DjvuImage(this);
PropertyChanged += DjvuPage_PropertyChanged;
if (form.ChunkType != ChunkType.BM44Form && form.ChunkType != ChunkType.PM44Form && Info == null)
{
throw new DjvuFormatException(
$"Page {PageNumber} does not have associated Info chunk." +
"Page is invalid and can not be displayed");
}
else if (form.ChunkType == ChunkType.BM44Form || form.ChunkType == ChunkType.PM44Form)
{
// TODO: Debug log or assert
}
}
