Sakurai/pdf.js
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Modify key events for horizontal scrolling

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Specifically, when there is no vertical scrollbar, let up, down, page
up, and page down all trigger moving to the next or previous page.
This commit is contained in:
Ryan Hendrickson 2018-05-14 23:10:32 -04:00
parent 3d83c646c6
commit eaf14e5d47
2 changed files with 47 additions and 22 deletions

64
web/app.js

@ -2229,28 +2229,31 @@ function webViewerKeyDown(evt) {
}
if (cmd === 0) { // no control key pressed at all.
let turnPage = 0, turnOnlyIfPageFit = false;
switch (evt.keyCode) {
case 38: // up arrow
case 33: // pg up
case 8: // backspace
if (!isViewerInPresentationMode &&
pdfViewer.currentScaleValue !== 'page-fit') {
break;
// vertical scrolling using arrow/pg keys
if (pdfViewer.isVerticalScrollbarEnabled) {
turnOnlyIfPageFit = true;
}
/* in presentation mode */
/* falls through */
turnPage = -1;
break;
case 8: // backspace
if (!isViewerInPresentationMode) {
turnOnlyIfPageFit = true;
}
turnPage = -1;
break;
case 37: // left arrow
// horizontal scrolling using arrow keys
if (pdfViewer.isHorizontalScrollbarEnabled) {
break;
turnOnlyIfPageFit = true;
}
/* falls through */
case 75: // 'k'
case 80: // 'p'
if (PDFViewerApplication.page > 1) {
PDFViewerApplication.page--;
}
handled = true;
turnPage = -1;
break;
case 27: // esc key
if (PDFViewerApplication.secondaryToolbar.isOpen) {
@ -2263,27 +2266,30 @@ function webViewerKeyDown(evt) {
handled = true;
}
break;
case 13: // enter key
case 40: // down arrow
case 34: // pg down
case 32: // spacebar
if (!isViewerInPresentationMode &&
pdfViewer.currentScaleValue !== 'page-fit') {
break;
// vertical scrolling using arrow/pg keys
if (pdfViewer.isVerticalScrollbarEnabled) {
turnOnlyIfPageFit = true;
}
/* falls through */
turnPage = 1;
break;
case 13: // enter key
case 32: // spacebar
if (!isViewerInPresentationMode) {
turnOnlyIfPageFit = true;
}
turnPage = 1;
break;
case 39: // right arrow
// horizontal scrolling using arrow keys
if (pdfViewer.isHorizontalScrollbarEnabled) {
break;
turnOnlyIfPageFit = true;
}
/* falls through */
case 74: // 'j'
case 78: // 'n'
if (PDFViewerApplication.page < PDFViewerApplication.pagesCount) {
PDFViewerApplication.page++;
}
handled = true;
turnPage = 1;
break;
case 36: // home
@ -2313,6 +2319,20 @@ function webViewerKeyDown(evt) {
PDFViewerApplication.rotatePages(90);
break;
}
if (turnPage !== 0 &&
(!turnOnlyIfPageFit || pdfViewer.currentScaleValue === 'page-fit')) {
if (turnPage > 0) {
if (PDFViewerApplication.page < PDFViewerApplication.pagesCount) {
PDFViewerApplication.page++;
}
} else {
if (PDFViewerApplication.page > 1) {
PDFViewerApplication.page--;
}
}
handled = true;
}
}
if (cmd === 4) { // shift-key

5
web/base_viewer.js

@ -845,6 +845,11 @@ class BaseViewer {
false : (this.container.scrollWidth > this.container.clientWidth));
}
get isVerticalScrollbarEnabled() {
return (this.isInPresentationMode ?
false : (this.container.scrollHeight > this.container.clientHeight));
}
_getVisiblePages() {
throw new Error('Not implemented: _getVisiblePages');
}