RGen_PdfPageEvent.cs

internal class ReleaseNotesPdfPageEvents : IPdfPageEvent
{
    private const float FooterYPos = 30;
    private const float HorizontalSpacer = 60;
    private const float FooterFontSize = 9;
    private const float HeadingFontSize = 18;

    private BaseFont _baseFont = null;
    private BaseFont _frontPageFont = null;

    private PdfContentByte _content;
    private readonly ReleaseNotesWriterSettings _settings;
    private bool _skipPageFooter;
    private PdfImportedPage _template;

    public ReleaseNotesPdfPageEvents(ReleaseNotesWriterSettings settings)
    {
        _settings = settings;
    }

    #region IPdfPageEvent Members

    public void OnChapter(PdfWriter writer, Document document, float paragraphPosition, Paragraph title)
    {
        Console.WriteLine("Chapter Start: " + title.Content);
    }

    public void OnChapterEnd(PdfWriter writer, Document document, float paragraphPosition)
    {
        Console.WriteLine("Chapter End:");
    }

    public void OnCloseDocument(PdfWriter writer, Document document)
    {
    }

    public void OnEndPage(PdfWriter writer, Document document)
    {
        WriterFooter(writer);
        WritePageTemplate(writer);
        _skipPageFooter = false;
    }

    public void OnGenericTag(PdfWriter writer, Document document, Rectangle rect, string text)
    {
    }

    public void OnOpenDocument(PdfWriter writer, Document document)
    {
        _baseFont = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.EMBEDDED);
        _frontPageFont = BaseFont.CreateFont(BaseFont.HELVETICA_BOLD, BaseFont.CP1252, BaseFont.EMBEDDED);
        _content = writer.DirectContent;

        if (!string.IsNullOrEmpty(_settings.PageTemplate))
        {
            var reader = new PdfReader(_settings.PageTemplate);
            _template = writer.GetImportedPage(reader, 1);
        }

        WriteFrontPage(writer, document);
    }

    public void OnParagraph(PdfWriter writer, Document document, float paragraphPosition)
    {
    }

    public void OnParagraphEnd(PdfWriter writer, Document document, float paragraphPosition)
    {
    }

    public void OnSection(PdfWriter writer, Document document, float paragraphPosition, int depth, Paragraph title)
    {
        Console.WriteLine("Section Start: " + title.Content);
    }

    public void OnSectionEnd(PdfWriter writer, Document document, float paragraphPosition)
    {
        Console.WriteLine("Section End:");
    }

    public void OnStartPage(PdfWriter writer, Document document)
    {
    }

    #endregion

    #region Methods

    private float GetFooterTextRightPosition(string text, PdfWriter writer)
    {
        return writer.PageSize.Width - HorizontalSpacer - _baseFont.GetWidthPoint(text, FooterFontSize)/2;
    }

    private float GetFrontPageTextYPosition(PdfWriter writer)
    {
        return writer.PageSize.Height / 2;
    }

    private float GetFrontPageTextXPosition(string text, PdfWriter writer)
    {
        return (writer.PageSize.Width - _frontPageFont.GetWidthPoint(text, HeadingFontSize)) / 2;
    }

    private void WriteFrontPage(PdfWriter writer, Document document)
    {
        if (!string.IsNullOrEmpty(_settings.FrontPageTemplate))
        {
            document.NewPage();

            // Write Generated On
            string title = _settings.GetDocumentTitle();

            _content.BeginText();
            _content.SetFontAndSize(_frontPageFont, HeadingFontSize);
            _content.SetTextMatrix(GetFrontPageTextXPosition(title, writer), GetFrontPageTextYPosition(writer));
            _content.ShowText(title);
            _content.EndText();

            var reader = new PdfReader(_settings.FrontPageTemplate);
            writer.DirectContentUnder.AddTemplate(writer.GetImportedPage(reader, 1), 0, 0);
            _skipPageFooter = true;
        }
    }

    private void WritePageTemplate(PdfWriter writer)
    {
        if (_template != null)
            writer.DirectContentUnder.AddTemplate(_template, 0, 0);
    }

    private void WriterFooter(PdfWriter writer)
    {
        if (_skipPageFooter)
            return;

        // Write footer text (page numbers)
        string text = writer.PageNumber.ToString(CultureInfo.InvariantCulture);
        _content.BeginText();
        _content.SetFontAndSize(_baseFont, FooterFontSize);
        _content.SetTextMatrix(GetFooterTextRightPosition(text, writer), FooterYPos);
        _content.ShowText(text);
        _content.EndText();

        // Write Generated On
        text = "Generated";
        if (!string.IsNullOrEmpty(_settings.BuildVersionNumber))
            text += " for Build " + _settings.BuildVersionNumber;

        text += " on " + _settings.GeneratedOn.ToString("G");

        _content.BeginText();
        _content.SetFontAndSize(_baseFont, FooterFontSize);
        _content.SetTextMatrix(HorizontalSpacer, FooterYPos);
        _content.ShowText(text);
        _content.EndText();
    }

    #endregion
}