This option is old enough that it predates e.g. the introduction of AppOptions, so it probably cannot hurt to re-factor this a little bit now.
- In development-mode we can just set this directly in AppOptions.
- In the extension-builds we still need to set it dynamically, however by moving this code we get the benefit of being able to avoid storing a data-URL in that case; note how [the API ignores those anyway](98e772727e/src/display/api.js (L256-L262)).
To avoid introducing any inline "hacks" in the viewer-code this meant adding `useSystemFonts` to the AppOptions, which thus required some new functionality since the default value should be `undefined` given how the option is handled in the API; note [this code](ed83d7c5e1/src/display/api.js (L298-L301)).
Finally, also moves the definition of the development-mode `window.isGECKOVIEW` property to the HTML file such that it's guaranteed to be set regardless of how and when it's accessed.
The old implementation in `PDFViewerApplication.download` means that if the `getDocument`-call hasn't yet downloaded the *entire* PDF document it will be re-downloaded. This seems generally undesirable since:
- In some (probably rare) cases a URL may not be valid an arbitrary number of times, which means that the download may fail.
- It will lead to wasted resources, since we'll end up fetching the same PDF document *twice* in that case (once via the `getDocument`-call and once to allow the user to save it).
Hence this patch suggests that we change this very old code to instead always call the `PDFDocumentProxy.getData` method, since that'll trigger immediate downloading of the remaining document via the existing `getDocument`-call.
Finally, the patch removes the `PDFViewerApplication.downloadComplete` property since it's now unused.
This was only necessary to prevent (unlikely) visual glitches when `disableAutoFetch = true` is being used.
However, it turns out that we can move this functionality into the `ProgressBar` class instead by checking if the entire PDF document has loaded. This works since the API is always reporting 100% loading progress regardless of how the document was loaded; see [this code](ed83d7c5e1/src/display/api.js (L2735-L2740)).
After the changes in PR 18413 we're now relying even more on `AppOptions` and it thus seems like a good idea to ensure that no invalid values can be added.
Hence the `AppOptions.{set, setAll}` methods will now *unconditionally* validate that the type of the values agree with the default-options.
According to the PDF specification these destinations should have a zoom parameter, which may however be `null`, but it shouldn't be omitted; please see https://opensource.adobe.com/dc-acrobat-sdk-docs/pdfstandards/PDF32000_2008.pdf#G11.2095870
Hence we try to work-around bad PDF generators by making the zoom parameter optional when validating explicit destinations in both the worker and the viewer.
To avoid having to request and await various browser data early during the PDF Viewer initialization, we can include that data in the existing preference fetching instead. With other planned changes to the PDF Viewer, the current situation would only become worse over time.
*Note:* Technically this data aren't preference-values, however we're already including other non-prefs in this list (e.g. `isInAutomation`) and doing it this way simplifies the overall implementation.
As far as I can tell `Outliner` is only exposed in the API because we need to access it when running some of the reference-tests, but is otherwise not used.
Hence this seems like something that should be kept *internal* and thus only exposed in TESTING-builds.
Switching to an editing mode can be asynchronous (e.g. if an editable annotation exists on a
visible page), so we must add a new editor only when the page rendering is done.
When the mouse was hovering an existing highlight, all the text in the page
was selected.
So when the user is selecting some text or drawing a free highlight, the mouse
is disabled for the existing editors.
Because of editor z-index, the toolbar belonging to an highlight created
before a second adjacent one, can be overlapped by this new one.
So when the user select an editor we just show it on front of all the other
ones to make sure that it can be used normally.
According to the PDF specification these destinations should have a coordinate parameter, which may however be `null`, but it shouldn't be omitted; please see https://opensource.adobe.com/dc-acrobat-sdk-docs/pdfstandards/PDF32000_2008.pdf#G11.2095870
Hence we try to work-around bad PDF generators by making the coordinate parameter optional when validating explicit destinations in both the worker and the viewer.
In the MOZCENTRAL build the `BasePreferences` class is almost unused, since it's only being used to initialize and update the `AppOptions` which means that theoretically we could move the relevant code there.
However for the other build targets (e.g. GENERIC and CHROME) we still need to keep the `BasePreferences` class, although we can re-factor things to move the necessary validation inside of `AppOptions` and thus simplify the code and reduce duplication.
The patch also moves the event dispatching, for changed preference values, into `AppOptions` instead.
This patch fixes a situation that'll probably never happen, but nonetheless seems like something that we should address.
Currently the "updatedPreference" listener isn't registered *until after* the preferences have been read and initialized, which leaves a very short window of time where a preference change could theoretically be skipped.
Right now, editable annotations are using their own canvas when they're drawn, but
it induces several issues:
- if the annotation has to be composed with the page then the canvas must be correctly
composed with its parent. That means we should move the canvas under canvasWrapper
and we should extract composing info from the drawing instructions...
Currently it's the case with highlight annotations.
- we use some extra memory for those canvas even if the user will never edit them, which
the case for example when opening a pdf in Fenix.
So with this patch, all the editable annotations are drawn on the canvas. When the
user switches to editing mode, then the pages with some editable annotations are redrawn but
without them: they'll be replaced by their counterpart in the annotation editor layer.
While the event listener is removed during testing, the `requestAnimationFrame` isn't cancelled and that occasionally shows up when the integration-tests are run on the bots.
