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[api-minor] Add basic support for PageLayout in the API and the viewer

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Please see the specification, https://www.adobe.com/content/dam/acom/en/devnet/acrobat/pdfs/PDF32000_2008.pdf#G6.2393749, and refer to the inline comments for additional details.
This commit is contained in:
Jonas Jenwald 2019-04-03 13:48:18 +02:00
parent 57abddc9ca
commit 7a999d1d67
5 changed files with 85 additions and 2 deletions
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32
web/app.js
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@ -889,6 +889,8 @@ let PDFViewerApplication = {
// Since the `setInitialView` call below depends on this being resolved,
// fetch it early to avoid delaying initial rendering of the PDF document.
const pageLayoutPromise = pdfDocument.getPageLayout().catch(
function() { /* Avoid breaking initial rendering; ignoring errors. */ });
const pageModePromise = pdfDocument.getPageMode().catch(
function() { /* Avoid breaking initial rendering; ignoring errors. */ });
const openActionDestPromise = pdfDocument.getOpenActionDestination().catch(
@ -934,8 +936,8 @@ let PDFViewerApplication = {
}).catch(() => { /* Unable to read from storage; ignoring errors. */ });
Promise.all([
storePromise, pageModePromise, openActionDestPromise,
]).then(async ([values = {}, pageMode, openActionDest]) => {
storePromise, pageLayoutPromise, pageModePromise, openActionDestPromise,
]).then(async ([values = {}, pageLayout, pageMode, openActionDest]) => {
const viewOnLoad = AppOptions.get('viewOnLoad');
this._initializePdfHistory({
@ -974,6 +976,9 @@ let PDFViewerApplication = {
if (pageMode && sidebarView === SidebarView.UNKNOWN) {
sidebarView = apiPageModeToSidebarView(pageMode);
}
if (pageLayout && spreadMode === SpreadMode.UNKNOWN) {
spreadMode = apiPageLayoutToSpreadMode(pageLayout);
}
this.setInitialView(hash, {
rotation, sidebarView, scrollMode, spreadMode,
@ -2434,6 +2439,29 @@ function webViewerKeyDown(evt) {
}
}
/**
* Converts API PageLayout values to the format used by `PDFViewer`.
* NOTE: This is supported to the extent that the viewer implements the
* necessary Scroll/Spread modes (since SinglePage, TwoPageLeft,
* and TwoPageRight all suggests using non-continuous scrolling).
* @param {string} mode - The API PageLayout value.
* @returns {number} A value from {SpreadMode}.
*/
function apiPageLayoutToSpreadMode(layout) {
switch (layout) {
case 'SinglePage':
case 'OneColumn':
return SpreadMode.NONE;
case 'TwoColumnLeft':
case 'TwoPageLeft':
return SpreadMode.ODD;
case 'TwoColumnRight':
case 'TwoPageRight':
return SpreadMode.EVEN;
}
return SpreadMode.NONE; // Default value.
}
/**
* Converts API PageMode values to the format used by `PDFSidebar`.
* NOTE: There's also a "FullScreen" parameter which is not possible to support,