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Slightly improve the BaseViewer.{firstPagePromise, onePageRendered, pagesPromise} functionality

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There's a couple of issues with this functionality:
 - The respective `PromiseCapability` instances are not being reset, in `BaseViewer._resetView`, when the document is closed which is inconsistent with all other state.
 - While the default viewer depends on these promises, and they thus ought to be considered part of e.g. the `PDFViewer` API-surface, they're not really defined in a particularily user-visible way (being that they're attached to the `BaseViewer` instance *inline* in `BaseViewer.setDocument`).
 - There's some internal `BaseViewer` state, e.g. `BaseViewer._pageViewsReady`, which is tracked manually and could instead be tracked indirectly via the relevant `PromiseCapability`, thus reducing the need to track state *twice* since that's always best to avoid.

*Please note:* In the existing implementation, these promises are not defined *until* the `BaseViewer.setDocument` method has been called.
While it would've been simple to lift that restriction in this patch, I'm purposely choosing *not* to do so since this ensures that any Promise handlers added inside of `BaseViewer.setDocument` are always invoked *before* any external ones (and keeping that behaviour seems generally reasonable).
This commit is contained in:
Jonas Jenwald 2020-03-07 13:11:51 +01:00
parent 7b07b88e71
commit 1fac29d184
2 changed files with 32 additions and 24 deletions
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4
web/app.js
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@ -1057,9 +1057,7 @@ const PDFViewerApplication = {
const pdfViewer = this.pdfViewer;
pdfViewer.setDocument(pdfDocument);
const firstPagePromise = pdfViewer.firstPagePromise;
const pagesPromise = pdfViewer.pagesPromise;
const onePageRendered = pdfViewer.onePageRendered;
const { firstPagePromise, onePageRendered, pagesPromise } = pdfViewer;
const pdfThumbnailViewer = this.pdfThumbnailViewer;
pdfThumbnailViewer.setDocument(pdfDocument);