add support for PDF outlines #437
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@inthewaves Needs to be rebased. |
I wrote a lot of the JS code years ago with testing help from an anonymous contributor. We also discussed some UI parts, but planning to rewrite the UI from scratch.
Fragments also let us have easier scroll-state preservation.
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@thestinger Done |
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Closes #66
PDFs have an ability to hold an outline and pdfjs supports it (see 8.2.2 Document Outline of the PDF 1.7 spec).
The outlines are lazily loaded; they won't be parsed if the user doesn't open the outlines screen. The outlines are first parsed in JavaScript first to resolve page numbers, then a simplified tree is encoded into JSON and passed to JVM code. Finally, the tree is reconstructed and displayed in the UI. Outline parsing is cancellable just in case.
No outlines
outlinestest-1.mp4
Big outline tree
https://opensource.adobe.com/dc-acrobat-sdk-docs/pdfstandards/pdfreference1.7old.pdf
outlinestest-2.mp4