PDFsharp & MigraDoc Foundation

PDFsharp - A .NET library for processing PDF & MigraDoc Foundation - Creating documents on the fly
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PostPosted: Fri Nov 30, 2018 6:00 am 
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I'm using MigraDoc to build PDF documents. I want to mark certain areas of the document to add to the outline later. The MigraDoc API requires a PdfPage for the outline, but the pages aren't there until the document is rendered. After the document is rendered, I need to find the pages that have the bookmarks and add just those pages to the outline.

One of the responses on StackOverflow uses BookMarks, but I don't always have something I can add a bookmark too. For example, pages with only images. Another way mentioned was to add some tiny invisible text. Is there a generic way I can place identifiers in the document and find the pages later? I suppose I could add bookmarks to empty paragraphs, then later on find what page those bookmarks are on and add an Outline entries for those pages.

This is the idea, but I couldn't get it to work:
https://stackoverflow.com/questions/294 ... 3#29497223

Thanks,
Brian


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PostPosted: Fri Nov 30, 2018 7:42 am 
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Joined: Sat Mar 14, 2015 10:15 am
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Location: CCAA
Each MigraDoc document object has a Tag member that you can use to tag the element.

To have MigraDoc create the outlines, you can use "invisible" paragraphs - no tagging needed.

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Thomas
(Freelance Software Developer with several years of MigraDoc/PDFsharp experience)


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PostPosted: Fri Nov 30, 2018 3:56 pm 
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If I tag an element, how do I go back later and find what page it is on?

If I go the invisible text route, how would you recommend making paragraphs "invisible" so they don't affect the layout? Also, even though the text is not visible in the document, it will still be visible in the outline?

I believe I have somethign that works. I did this and the text is not shown and the layout seems to be the same as if the text wasn't even there. I am adding the code here to complete this post so if someone finds it later than can see the whole thing:

Code:
Style style = pdfDoc.Styles["Heading1"];  // will be used for the root entry of the outline
style.Font.Size = .001;
style.Font.Color = Colors.White;
style.ParagraphFormat.PageBreakBefore = false;
style.ParagraphFormat.SpaceBefore = 0;
style.ParagraphFormat.SpaceAfter = 0;

style = pdfDoc.Styles["Heading2"];    // will be used for the second level of the outline
style.Font.Size = .001;
style.Font.Color = Colors.White;
style.ParagraphFormat.PageBreakBefore = false;
style.ParagraphFormat.SpaceBefore = 0;
style.ParagraphFormat.SpaceAfter = 0;


So to add the root to the outline, I do:
section.AddParagraph("Outline Root", "Heading1");

and to add second level outline entries I do:
section.AddParagraph("Specifications", "Heading2");


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PostPosted: Sat Dec 01, 2018 8:25 am 
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Joined: Sat Mar 14, 2015 10:15 am
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That is more or less the trick I used.

You can invoke "Clone()" to create copies of "Heading1" under a different name, so you can still have visible headings on other pages.

To find which objects are on a specific page, use code like "docRenderer.GetDocumentObjectsFromPage(idx + 1)".
See also:
http://forum.pdfsharp.net/viewtopic.php?p=1904#p1904
Note: with PDFsharp 1.50 you no longer need the Internalsvisibleto trick, all you need is public.

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Thomas
(Freelance Software Developer with several years of MigraDoc/PDFsharp experience)


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