//// This code is part of Document Solutions for PDF .NET demos.// Copyright (c) MESCIUS inc. All rights reserved.//using System.IO;using System.Drawing;using GrapeCity.Documents.Pdf;using GrapeCity.Documents.Text;
namespace DsPdfWeb.Demos.Basics{    // Demonstrates a simple way to generate left/centered/right aligned page headers and footers.    public class PageHeaders    {        // The document being generated:        private GcPdfDocument _doc;
        // Utility method to draw a part of a page header or footer.        // Parameters:        // - text: The part's text.        // - tf: The text format to use.        // - pageIdx: The page index.        // - header: True if this is a header, false if a footer.        // - horzAlign: Horizontal alignment (left/center/right).        private void RenderHeader(string text, TextFormat tf, int pageIdx, bool header, TextAlignment horzAlign)        {            var page = _doc.Pages[pageIdx];            var tl = page.Graphics.CreateTextLayout();            tl.MaxWidth = page.Size.Width;            tl.MaxHeight = page.Size.Height;            // 1" margins, adjust as needed:            tl.MarginLeft = tl.MarginRight = tl.Resolution;            // 1/3" spacing above top/below bottom header, adjust as needed:            tl.MarginTop = tl.MarginBottom = tl.Resolution / 3;            // Vertical alignment:            tl.ParagraphAlignment = header ? ParagraphAlignment.Near : ParagraphAlignment.Far;            // Horizontal alignment:            tl.TextAlignment = horzAlign;            tl.Append(text, tf);            // NOTE: if some part of a header or footer is static, we could cache the corresponding TextLayout            // object and save some cycles by just drawing that cached TextLayout on each page w/out anything else:            tl.PerformLayout(true);            // Draw the header at (0,0) (header located by margins and alignment):            page.Graphics.DrawTextLayout(tl, PointF.Empty);        }
        // The main program.        public int CreatePDF(Stream stream)        {            _doc = new GcPdfDocument();            var page = _doc.NewPage();            // Add a note about flipping landscape:            var noteRect = Common.Util.AddNote(                "We flip page orientation in this sample only to show that these page headers can adapt to the changing page size.",                page);            // Prepare a TextLayout with some long text and print it (see PaginatedText for details):            var tl = page.Graphics.CreateTextLayout();            tl.DefaultFormat.Font = StandardFonts.Times;            tl.DefaultFormat.FontSize = 12;            tl.MaxWidth = _doc.PageSize.Width;            tl.MaxHeight = _doc.PageSize.Height;            tl.MarginAll = tl.Resolution;            tl.MarginTop = noteRect.Bottom + 18;            // Add sample text:            tl.Append(Common.Util.LoremIpsum(20));            // Calculate glyphs and perform layout (see also PerformLayout call in the loop below):            tl.PerformLayout(true);            // In a loop, split and render the text:            while (true)            {                var splitResult = tl.Split(null, out TextLayout rest);                page.Graphics.DrawTextLayout(tl, PointF.Empty);                if (splitResult != SplitResult.Split)                    break;                tl = rest;                tl.MarginTop = tl.Resolution;                page = _doc.Pages.Add();                // For sample sake, toggle page orientation:                page.Landscape = !_doc.Pages[_doc.Pages.Count - 2].Landscape;                // Update layout size to reflect the new page orientation:                tl.MaxWidth = page.Size.Width;                tl.MaxHeight = page.Size.Height;                // Because we changed layout size, we must perform layout again -                // but can do it without recalculating glyphs:                tl.PerformLayout(false);            }            // Render the headers in a separate loop (so that we can provide 'Page X of Y' header):            var tf = new TextFormat() { Font = StandardFonts.Helvetica, FontSize = 10, ForeColor = Color.Gray };            var now = Common.Util.TimeNow().ToString("u");            for (int pageIdx = 0; pageIdx < _doc.Pages.Count; ++pageIdx)            {                RenderHeader(now, tf, pageIdx, true, TextAlignment.Leading);                RenderHeader("Easy Page Headers Sample", tf, pageIdx, true, TextAlignment.Center);                RenderHeader($"Page {pageIdx + 1} of {_doc.Pages.Count}", tf, pageIdx, true, TextAlignment.Trailing);                RenderHeader("Page footer - left", tf, pageIdx, false, TextAlignment.Leading);                RenderHeader("DsPdf", tf, pageIdx, false, TextAlignment.Center);                RenderHeader("Page footer - right", tf, pageIdx, false, TextAlignment.Trailing);            }            // Done:            _doc.Save(stream);            return _doc.Pages.Count;        }    }}