// extension method to the outlines
// in the itext package
public static int GetPageNumber(this PdfOutline outline, PdfDocument doc)
{
try
{
PdfDictionary dict = outline.GetContent().GetAsDictionary(PdfName.A);
if (dict == null)
{
PdfArray array = outline.GetContent().GetAsArray(PdfName.Dest);
if (array != null)
{
PdfObject obj = array.SubList(0, 1)[0];
if (obj is PdfNumber)
{
return(((PdfNumber)obj).IntValue() + 1);
}
else if (obj is PdfDictionary)
{
return(doc.GetPageNumber((PdfDictionary)obj));
}
else
{
return(-3);
}
}
else
{
return(-1);
}
}
dict = dict.GetAsArray(PdfName.D).GetAsDictionary(0);
return(doc.GetPageNumber(dict));
}
#pragma warning disable CS0168 // The variable 'e' is declared but never used
catch (Exception e)
#pragma warning restore CS0168 // The variable 'e' is declared but never used
{
return(-2);
}
}
/// <summary>the next element in the entire hierarchy</summary>
/// <param name="outline"></param>
/// <exception cref="iText.Kernel.PdfException"/>
private PdfOutline GetAbsoluteTreeNextOutline(PdfOutline outline)
{
PdfObject nextPdfObject = outline.GetContent().Get(PdfName.Next);
PdfOutline nextPdfOutline = null;
if (outline.GetParent() != null && nextPdfObject != null)
{
foreach (PdfOutline pdfOutline in outline.GetParent().GetAllChildren())
{
if (pdfOutline.GetContent().GetIndirectReference().Equals(nextPdfObject.GetIndirectReference()))
{
nextPdfOutline = pdfOutline;
break;
}
}
}
if (nextPdfOutline == null && outline.GetParent() != null)
{
nextPdfOutline = GetAbsoluteTreeNextOutline(outline.GetParent());
}
return(nextPdfOutline);
}
