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| 1 | +using Syncfusion.Drawing; |
| 2 | +using Syncfusion.Pdf; |
| 3 | +using Syncfusion.Pdf.Graphics; |
| 4 | +using Syncfusion.Pdf.Interactive; |
| 5 | +using Syncfusion.Pdf.Parsing; |
| 6 | +using System.Collections.Generic; |
| 7 | + |
| 8 | +class Program |
| 9 | +{ |
| 10 | + public static PdfDocument document; |
| 11 | + public static PdfFont font; |
| 12 | + |
| 13 | + static void Main(string[] args) |
| 14 | + { |
| 15 | + // Load source PDFs using file streams |
| 16 | + using (FileStream fsharpStream = new FileStream(Path.GetFullPath(@"Data/Fsharp_Succinctly.pdf"), FileMode.Open, FileAccess.Read)) |
| 17 | + using (PdfLoadedDocument fsharpDoc = new PdfLoadedDocument(fsharpStream)) |
| 18 | + |
| 19 | + using (FileStream httpStream = new FileStream(Path.GetFullPath(@"Data/HTTP_Succinctly.pdf"), FileMode.Open, FileAccess.Read)) |
| 20 | + using (PdfLoadedDocument httpDoc = new PdfLoadedDocument(httpStream)) |
| 21 | + |
| 22 | + using (FileStream windowsStoreStream = new FileStream(Path.GetFullPath(@"Data/WindowsStoreApps_Succinctly.pdf"), FileMode.Open, FileAccess.Read)) |
| 23 | + using (PdfLoadedDocument windowsStoreDoc = new PdfLoadedDocument(windowsStoreStream)) |
| 24 | + { |
| 25 | + |
| 26 | + // Store all loaded documents in an array |
| 27 | + PdfLoadedDocument[] docs = { fsharpDoc, httpDoc, windowsStoreDoc }; |
| 28 | + |
| 29 | + |
| 30 | + // Create new document |
| 31 | + document = new PdfDocument(); |
| 32 | + document.PageSettings.Size = fsharpDoc.Pages[0].Size; |
| 33 | + |
| 34 | + // Estimate TOC pages needed |
| 35 | + int totalEntries = 60; |
| 36 | + int entriesPerPage = 30; |
| 37 | + int tocPages = (int)Math.Ceiling(totalEntries / (double)entriesPerPage); |
| 38 | + |
| 39 | + // Add TOC pages |
| 40 | + List<PdfPage> tocPagesList = new List<PdfPage>(); |
| 41 | + for (int i = 0; i < tocPages; i++) |
| 42 | + { |
| 43 | + PdfPage tocPage = document.Pages.Add(); |
| 44 | + tocPagesList.Add(tocPage); |
| 45 | + if (i == 0) |
| 46 | + { |
| 47 | + font = new PdfStandardFont(PdfFontFamily.Helvetica, 10f); |
| 48 | + PdfStringFormat format = new PdfStringFormat(PdfTextAlignment.Center, PdfVerticalAlignment.Middle); |
| 49 | + tocPage.Graphics.DrawString("Table Of Contents", font, PdfBrushes.Black, |
| 50 | + new RectangleF(PointF.Empty, new SizeF(tocPage.Graphics.ClientSize.Width, 20)), format); |
| 51 | + } |
| 52 | + } |
| 53 | + |
| 54 | + // Merge PDFs after TOC pages |
| 55 | + PdfDocument.Merge(document, docs); |
| 56 | + |
| 57 | + // Define TOC entries (title and corresponding page index) |
| 58 | + List<(string Title, int PageIndex)> tocEntries = GetTocEntries(); |
| 59 | + |
| 60 | + // Adjust TOC entries |
| 61 | + tocEntries = AdjustTOCEntriesWithOffset(tocEntries, tocPages); |
| 62 | + // Draw TOC entries |
| 63 | + float currentY = 30; |
| 64 | + int tocPageIndex = 0; |
| 65 | + PdfPage currentTocPage = tocPagesList[tocPageIndex]; |
| 66 | + foreach (var (title, pageIndex) in tocEntries) |
| 67 | + { |
| 68 | + if (currentY > currentTocPage.Graphics.ClientSize.Height - 50) |
| 69 | + { |
| 70 | + tocPageIndex++; |
| 71 | + currentTocPage = tocPagesList[tocPageIndex]; |
| 72 | + currentY = 30; |
| 73 | + } |
| 74 | + |
| 75 | + currentY = AddBookmark(document.Pages[pageIndex], currentTocPage, title, currentY); |
| 76 | + } |
| 77 | + |
| 78 | + //Create file stream. |
| 79 | + using (FileStream outputFileStream = new FileStream(Path.GetFullPath(@"Output/Output.pdf"), FileMode.Create, FileAccess.ReadWrite)) |
| 80 | + { |
| 81 | + //Save the PDF document to file stream. |
| 82 | + document.Save(outputFileStream); |
| 83 | + } |
| 84 | + //Close the document |
| 85 | + document.Close(true); |
| 86 | + } |
| 87 | + } |
| 88 | + |
| 89 | + // Generates a list of Table of Contents (TOC) entries with titles and corresponding page indices. |
| 90 | + static List<(string Title, int PageIndex)> GetTocEntries() |
| 91 | + { |
| 92 | + List<(string Title, int PageIndex)> entries = new List<(string, int)>(); |
| 93 | + |
| 94 | + for (int i = 1; i <= 60; i++) |
| 95 | + { |
| 96 | + // Pages 1–20: F# document |
| 97 | + if (i <= 20) |
| 98 | + { |
| 99 | + entries.Add(($"F# - This is first document {i}", i)); |
| 100 | + } |
| 101 | + // Pages 21–40: HTTP document |
| 102 | + else if (i > 20 && i <= 40) |
| 103 | + { |
| 104 | + entries.Add(($"HTTP - This is second document {i}", i)); |
| 105 | + } |
| 106 | + // Pages 41–60: Windows Store Apps document |
| 107 | + else |
| 108 | + { |
| 109 | + entries.Add(($"Windows Store Apps - This is third document {i}", i)); |
| 110 | + } |
| 111 | + } |
| 112 | + |
| 113 | + return entries; |
| 114 | + } |
| 115 | + |
| 116 | + //Adjusts the page indices of the Table of Contents (TOC) entries by adding an offset. |
| 117 | + public static List<(string Title, int PageIndex)> AdjustTOCEntriesWithOffset(List<(string Title, int PageIndex)> tocEntries, int tocPages) |
| 118 | + { |
| 119 | + List<(string, int)> adjustedList = new List<(string, int)>(); |
| 120 | + |
| 121 | + // Loop through each TOC entry and add the TOC page count to its page index |
| 122 | + foreach (var (title, pageIndex) in tocEntries) |
| 123 | + { |
| 124 | + adjustedList.Add((title, pageIndex + tocPages)); |
| 125 | + } |
| 126 | + |
| 127 | + return adjustedList; |
| 128 | + } |
| 129 | + |
| 130 | + // Adding bookmarks and drawing TOC entries |
| 131 | + private static float AddBookmark(PdfPage page, PdfPage toc, string content, float currentY) |
| 132 | + { |
| 133 | + // Add a new bookmark to the document with the given title |
| 134 | + PdfBookmark bookmark = document.Bookmarks.Add(content); |
| 135 | + |
| 136 | + // Draw the TOC entry text on the TOC page and get the updated Y-position |
| 137 | + float newY = AddTableOfContent(page, toc, content, new PointF(0, currentY)); |
| 138 | + |
| 139 | + // Create a named destination pointing to the specified page and location |
| 140 | + PdfNamedDestination namedDestination = new PdfNamedDestination(content) |
| 141 | + { |
| 142 | + Destination = new PdfDestination(page, new PointF(0, currentY)) |
| 143 | + { |
| 144 | + Mode = PdfDestinationMode.FitToPage // Ensures the destination fits the entire page in view |
| 145 | + } |
| 146 | + }; |
| 147 | + |
| 148 | + // Add the named destination to the document's collection |
| 149 | + document.NamedDestinationCollection.Add(namedDestination); |
| 150 | + |
| 151 | + // Link the bookmark to the named destination |
| 152 | + bookmark.NamedDestination = namedDestination; |
| 153 | + |
| 154 | + // Return the updated Y-position for the next TOC entry |
| 155 | + return newY; |
| 156 | + } |
| 157 | + |
| 158 | + //Draws a TOC entry on the specified page, adds the corresponding page number, and creates a clickable link that navigates to the target content page. |
| 159 | + private static float AddTableOfContent(PdfPage page, PdfPage toc, string content, PointF point) |
| 160 | + { |
| 161 | + // Define the width available for the TOC entry text |
| 162 | + float textWidth = toc.Graphics.ClientSize.Width - 60; |
| 163 | + |
| 164 | + // Define the bounds where the TOC entry will be drawn |
| 165 | + RectangleF textBounds = new RectangleF(point.X, point.Y, textWidth, 100); |
| 166 | + |
| 167 | + // Create a text element for the TOC entry |
| 168 | + PdfTextElement element = new PdfTextElement(content, font, PdfBrushes.Blue); |
| 169 | + |
| 170 | + // Set layout format to fit within the page and allow pagination if needed |
| 171 | + PdfLayoutFormat format = new PdfLayoutFormat |
| 172 | + { |
| 173 | + Break = PdfLayoutBreakType.FitPage, |
| 174 | + Layout = PdfLayoutType.Paginate |
| 175 | + }; |
| 176 | + |
| 177 | + // Draw the TOC entry text and get the layout result |
| 178 | + PdfLayoutResult result = element.Draw(toc, textBounds, format); |
| 179 | + |
| 180 | + // Draw the corresponding page number on the right side of the TOC page |
| 181 | + string pageNum = (document.Pages.IndexOf(page) + 1).ToString(); |
| 182 | + PdfTextElement pageNumber = new PdfTextElement(pageNum, font, PdfBrushes.Black); |
| 183 | + pageNumber.Draw(toc, new PointF(toc.Graphics.ClientSize.Width - 40, point.Y)); |
| 184 | + |
| 185 | + // Create a clickable link annotation over the TOC entry text |
| 186 | + RectangleF bounds = result.Bounds; |
| 187 | + bounds.Width = textWidth; |
| 188 | + |
| 189 | + PdfDocumentLinkAnnotation documentLinkAnnotation = new PdfDocumentLinkAnnotation(bounds) |
| 190 | + { |
| 191 | + AnnotationFlags = PdfAnnotationFlags.NoRotate, |
| 192 | + Text = content, |
| 193 | + Color = Color.Transparent, // Invisible clickable area |
| 194 | + Destination = new PdfDestination(page), |
| 195 | + Border = new PdfAnnotationBorder(0) // No visible border |
| 196 | + }; |
| 197 | + |
| 198 | + // Set the destination location on the target page |
| 199 | + documentLinkAnnotation.Destination.Location = point; |
| 200 | + |
| 201 | + // Add the link annotation to the TOC page |
| 202 | + toc.Annotations.Add(documentLinkAnnotation); |
| 203 | + |
| 204 | + // Return the updated Y-position for the next TOC entry |
| 205 | + return result.Bounds.Bottom + 10; |
| 206 | + } |
| 207 | +} |
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