//// 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;using GrapeCity.Documents.Drawing;
namespace DsPdfWeb.Demos.Basics{    // Demonstrates how paragraphs of text can be rendered as a numbered list in DsPdf.    // The method of rendering pages of text in this sample is taken from the PaginatedText    // sample. See also TextRendering.    public class NumberedList    {        // Encapsulate page layout constants used in the sample:        private struct Layout        {            public static float Margin => 72;            public static float ListOffset => 24;        };
        // Utility method which pre-pends numbers to all paragraphs in a TextLayout.        private void AddBullets(GcGraphics g, PointF pt, TextLayout tl, ref int itemNo)        {            var tlBullet = g.CreateTextLayout();            tlBullet.DefaultFormat.Font = StandardFonts.Times;            tlBullet.DefaultFormat.FontSize = 12;            foreach (var line in tl.Lines)            {                if (line.FirstLineInParagraph)                {                    tlBullet.Clear();                    tlBullet.Append($"{itemNo++})");                    tlBullet.PerformLayout(true);                    g.DrawTextLayout(tlBullet, new PointF(pt.X, pt.Y + line.Position + line.LineGap));                }            }        }
        // Main entry point:        public int CreatePDF(Stream stream)        {            var doc = new GcPdfDocument();            var ip = new PointF(Layout.Margin, Layout.Margin);            // Use TextLayout.MarginLeft to reserve space for list numbers/bullets:            var tl = new TextLayout(72)            {                MaxWidth = doc.PageSize.Width - Layout.Margin * 2,                MaxHeight = doc.PageSize.Height - Layout.Margin * 2,                ParagraphSpacing = 8,                MarginLeft = Layout.ListOffset,            };            tl.DefaultFormat.Font = StandardFonts.Times;
            // Add 20 paragraphs of text that will render as a numbered list of 20 items:            tl.Append(Common.Util.LoremIpsum(20, 1, 6));            // Perform layout:            tl.PerformLayout(true);            // Use split options to provide widow/orphan control:            var to = new TextSplitOptions(tl);            to.MinLinesInFirstParagraph = 2;            to.MinLinesInLastParagraph = 2;            // In a loop, split and render the text (see PaginatedText),            // and add list numbers:            int itemNo = 1;            while (true)            {                // 'rest' will accept the text that did not fit:                var splitResult = tl.Split(to, out TextLayout rest);                var g = doc.Pages.Add().Graphics;                g.DrawTextLayout(tl, ip);                AddBullets(g, ip, tl, ref itemNo);                if (splitResult != SplitResult.Split)                    break;                tl = rest;            }            // Done:            doc.Save(stream);            return doc.Pages.Count;        }    }}