//// 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{    // This sample shows how to add page labels to a document.    // Page labels allow you to subdivide the document into sequences of    // logically related page ranges (e.g. preface, main body, postface).    // In this sample consisting of 'chapters', we add a separate    // page labeling range for each chapter.    // The code in this sample is similar to the Outlines sample.    public class PageLabels    {        public int CreatePDF(Stream stream)        {            var doc = new GcPdfDocument();            // Text layout for main text (default DsPdf resolution is 72dpi):            var tl = new TextLayout(72);            tl.DefaultFormat.Font = StandardFonts.Times;            tl.DefaultFormat.FontSize = 12;            tl.FirstLineIndent = 72 / 2;            tl.MaxWidth = doc.PageSize.Width;            tl.MaxHeight = doc.PageSize.Height;            tl.MarginAll = tl.Resolution;            // Text layout for chapter headers:            var tlCaption = new TextLayout(72);            tlCaption.DefaultFormat.Font = StandardFonts.TimesBold;            tlCaption.DefaultFormat.FontSize = tl.DefaultFormat.FontSize + 4;            tlCaption.DefaultFormat.Underline = true;            tlCaption.MaxWidth = tl.MaxWidth;            tlCaption.MarginAll = tlCaption.Resolution;            // Split options to control splitting of text between pages:            var to = new TextSplitOptions(tl)            {                RestMarginTop = tl.Resolution,                MinLinesInFirstParagraph = 2,                MinLinesInLastParagraph = 2            };            // Generate a number of "chapters", provide outline entry for each:            const int NChapters = 20;            for (int i = 0; i < NChapters; ++i)            {                // Chapter title - print as chapter header and add as outline node:                string chapter = $"Chapter {i + 1}";
                // All it takes to add page labels is to add a PageLabelingRange                // associated with the index of the first page in the range,                // and the range prefix and numbering style:                doc.PageLabelingRanges.Add(doc.Pages.Count, new PageLabelingRange($"{chapter}, p. ", NumberingStyle.DecimalArabic, 1));
                doc.Pages.Add();                tlCaption.Clear();                tlCaption.Append(chapter);                tlCaption.PerformLayout(true);                // Add outline node for the chapter:                doc.Outlines.Add(new OutlineNode(chapter, new DestinationFitH(doc.Pages.Last, tlCaption.MarginTop)));                // Print the caption:                doc.Pages.Last.Graphics.DrawTextLayout(tlCaption, PointF.Empty);                // Chapter text:                tl.Clear();                tl.FirstLineIsStartOfParagraph = true;                tl.LastLineIsEndOfParagraph = true;                tl.Append(Common.Util.LoremIpsum(7));                // Account for chapter header in the main text layout:                tl.MarginTop = tlCaption.ContentRectangle.Bottom + 12;                tl.PerformLayout(true);                // Print the chapter:                while (true)                {                    // 'rest' will accept the text that did not fit:                    var splitResult = tl.Split(to, out TextLayout rest);                    doc.Pages.Last.Graphics.DrawTextLayout(tl, PointF.Empty);                    if (splitResult != SplitResult.Split)                        break;                    tl = rest;                    var p = doc.Pages.Add();                }            }            // Done:            doc.Save(stream);            return doc.Pages.Count;        }    }}