Get named destinations to ignore zoom in destination.

[farling42]

There is a pdfjs flag ignoreDestinationZoom which will ignore the zoom level in named destinations.

We should set this flag to true if an explicit zoom has been set in the module settings.

Unfortunately this flag needs to be set BEFORE the PdfLinkService is created, but AFTER the viewer.html has got far enough to create the preferences object.

[farling42]

In pdfjs, app.js creates a single PDFLinkService object, and passes ignoreDestinationZoom from AppOptions.get("ignoreDestinationZoom")

But the problem is setting the value in AppOptions between AppOptions being created and the PDFLinkService being created.

[farling42]

We need to call AppOptions.set("ignoreDestinationZoom", true) very early.

[farling42]

Some notes: see

document.addEventListener("webviewerloaded", function() {
  PDFViewerApplication.initializedPromise.then(function() {
    // The viewer has now been initialized.
  })
});

from https://github.com/mozilla/pdf.js/wiki/Third-party-viewer-usage

[farling42]

Note that updatePdfView could probably just call linkService.setHash(anchor)

[farling42]

Note that AppOptions might be available at event.target.contentWindow.PDFViewerApplicationOptions when processing the 'webviewerloaded' event

[farling42]

Implemented in 0.40.0