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Update BaseViewer.scrollPageIntoView to always validate the pageNumber parameter

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Note that when e.g. presentation mode is active, we fail[1] to ensure that the `pageNumber` parameter is actually an integer before calling `_setCurrentPageNumber` (that method expects the argument be an integer).
Also changes the method signature, of `scrollPageIntoView`, to use object destructuring instead.

---
[1] Most likely, this is actually *my* oversight :-)
This commit is contained in:
Jonas Jenwald 2018-11-09 09:45:09 +01:00
parent 2194aef03e
commit 2e38b7d00b
1 changed files with 22 additions and 24 deletions
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46
web/base_viewer.js
View File

@ -660,25 +660,23 @@ class BaseViewer {
* Scrolls page into view.
* @param {ScrollPageIntoViewParameters} params
*/
scrollPageIntoView(params) {
scrollPageIntoView({ pageNumber, destArray = null,
allowNegativeOffset = false, }) {
if (!this.pdfDocument) {
return;
}
let pageNumber = params.pageNumber || 0;
let dest = params.destArray || null;
let allowNegativeOffset = params.allowNegativeOffset || false;
if (this.isInPresentationMode || !dest) {
this._setCurrentPageNumber(pageNumber, /* resetCurrentPageView = */ true);
return;
}
let pageView = this._pages[pageNumber - 1];
const pageView = (Number.isInteger(pageNumber) &&
this._pages[pageNumber - 1]);
if (!pageView) {
console.error(
`${this._name}.scrollPageIntoView: Invalid "pageNumber" parameter.`);
return;
}
if (this.isInPresentationMode || !destArray) {
this._setCurrentPageNumber(pageNumber, /* resetCurrentPageView = */ true);
return;
}
let x = 0, y = 0;
let width = 0, height = 0, widthScale, heightScale;
let changeOrientation = (pageView.rotation % 180 === 0 ? false : true);
@ -687,11 +685,11 @@ class BaseViewer {
let pageHeight = (changeOrientation ? pageView.width : pageView.height) /
pageView.scale / CSS_UNITS;
let scale = 0;
switch (dest[1].name) {
switch (destArray[1].name) {
case 'XYZ':
x = dest[2];
y = dest[3];
scale = dest[4];
x = destArray[2];
y = destArray[3];
scale = destArray[4];
// If x and/or y coordinates are not supplied, default to
// _top_ left of the page (not the obvious bottom left,
// since aligning the bottom of the intended page with the
@ -705,7 +703,7 @@ class BaseViewer {
break;
case 'FitH':
case 'FitBH':
y = dest[2];
y = destArray[2];
scale = 'page-width';
// According to the PDF spec, section 12.3.2.2, a `null` value in the
// parameter should maintain the position relative to the new page.
@ -716,16 +714,16 @@ class BaseViewer {
break;
case 'FitV':
case 'FitBV':
x = dest[2];
x = destArray[2];
width = pageWidth;
height = pageHeight;
scale = 'page-height';
break;
case 'FitR':
x = dest[2];
y = dest[3];
width = dest[4] - x;
height = dest[5] - y;
x = destArray[2];
y = destArray[3];
width = destArray[4] - x;
height = destArray[5] - y;
let hPadding = this.removePageBorders ? 0 : SCROLLBAR_PADDING;
let vPadding = this.removePageBorders ? 0 : VERTICAL_PADDING;
@ -736,8 +734,8 @@ class BaseViewer {
scale = Math.min(Math.abs(widthScale), Math.abs(heightScale));
break;
default:
console.error(`${this._name}.scrollPageIntoView: "${dest[1].name}" ` +
'is not a valid destination type.');
console.error(`${this._name}.scrollPageIntoView: ` +
`"${destArray[1].name}" is not a valid destination type.`);
return;
}
@ -747,7 +745,7 @@ class BaseViewer {
this.currentScaleValue = DEFAULT_SCALE_VALUE;
}
if (scale === 'page-fit' && !dest[4]) {
if (scale === 'page-fit' && !destArray[4]) {
this._scrollIntoView({
pageDiv: pageView.div,
pageNumber,