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Make PDFHistory optional in PDFLinkService

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Currently `PDFLinkService` requires access to a `PDFHistory` instance in order for it to work correctly (and to avoid errors). If we want `PDFLinkService` to be more useful in custom viewers, I don't think that we actually want to force it to have a `PDFHistory` instance.
Hence this patch, which contains a very simply approach to make `PDFHistory` optional.
This commit is contained in:
Jonas Jenwald 2015-05-29 13:37:28 +02:00
parent 189ef974b1
commit 20881dc99a
1 changed files with 20 additions and 10 deletions
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30
web/pdf_link_service.js
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@ -89,12 +89,14 @@ var PDFLinkService = (function () {
}
self.pdfViewer.scrollPageIntoView(pageNumber, dest);
// Update the browsing history.
self.pdfHistory.push({
dest: dest,
hash: destString,
page: pageNumber
});
if (self.pdfHistory) {
// Update the browsing history.
self.pdfHistory.push({
dest: dest,
hash: destString,
page: pageNumber
});
}
} else {
self.pdfDocument.getPageIndex(destRef).then(function (pageIndex) {
var pageNum = pageIndex + 1;
@ -173,7 +175,9 @@ var PDFLinkService = (function () {
var params = parseQueryString(hash);
// borrowing syntax from "Parameters for Opening PDF Files"
if ('nameddest' in params) {
this.pdfHistory.updateNextHashParam(params.nameddest);
if (this.pdfHistory) {
this.pdfHistory.updateNextHashParam(params.nameddest);
}
this.navigateTo(params.nameddest);
return;
}
@ -233,7 +237,9 @@ var PDFLinkService = (function () {
} else if (/^\d+$/.test(hash)) { // page number
this.page = hash;
} else { // named destination
this.pdfHistory.updateNextHashParam(unescape(hash));
if (this.pdfHistory) {
this.pdfHistory.updateNextHashParam(unescape(hash));
}
this.navigateTo(unescape(hash));
}
},
@ -245,11 +251,15 @@ var PDFLinkService = (function () {
// See PDF reference, table 8.45 - Named action
switch (action) {
case 'GoBack':
this.pdfHistory.back();
if (this.pdfHistory) {
this.pdfHistory.back();
}
break;
case 'GoForward':
this.pdfHistory.forward();
if (this.pdfHistory) {
this.pdfHistory.forward();
}
break;
case 'NextPage':