Sakurai/pdf.js
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Keep current scroll position when zooming the document

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This commit is contained in:
Jonas 2013-07-31 19:43:03 +02:00
parent f7d2a09bf8
commit edf3163fa6
1 changed files with 56 additions and 30 deletions
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86
web/viewer.js
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@ -251,28 +251,45 @@ var PDFView = {
}, true);
},
setScale: function pdfViewSetScale(val, resetAutoSettings, noScroll) {
if (val == this.currentScale)
getPageTop: function pdfViewGetPageTop(id) {
return (this.pages[id - 1].el.offsetTop + this.pages[id - 1].el.clientTop);
},
setScale: function pdfViewSetScale(value, resetAutoSettings, noScroll) {
if (this.currentScale === value) {
return;
}
var pages = this.pages;
for (var i = 0; i < pages.length; i++)
pages[i].update(val * CSS_UNITS);
var pages = this.pages, page = this.page;
var currentPage = pages[page - 1], dest = null;
if (!noScroll && !this.isPresentationMode) {
// Obtain the current scroll position before resizing the pages.
var topLeft = currentPage.getPagePoint(this.container.scrollLeft,
(this.container.scrollTop - this.getPageTop(page)));
dest = [null, { name: 'XYZ' }, Math.round(topLeft[0]),
Math.round(topLeft[1]), null];
}
if (!noScroll && this.currentScale != val)
this.pages[this.page - 1].scrollIntoView();
this.currentScale = val;
for (var i = 0; i < pages.length; i++) {
pages[i].update(value * CSS_UNITS);
}
this.currentScale = value;
if (!noScroll) {
currentPage.scrollIntoView(dest);
}
var event = document.createEvent('UIEvents');
event.initUIEvent('scalechange', false, false, window, 0);
event.scale = val;
event.scale = value;
event.resetAutoSettings = resetAutoSettings;
window.dispatchEvent(event);
},
parseScale: function pdfViewParseScale(value, resetAutoSettings, noScroll) {
if ('custom' == value)
if ('custom' === value) {
return;
}
var scale = parseFloat(value);
this.currentScaleValue = value;
@ -1040,14 +1057,14 @@ var PDFView = {
} else if (storedHash) {
this.setHash(storedHash);
} else if (scale) {
this.parseScale(scale, true);
this.parseScale(scale, true, true);
this.page = 1;
}
if (PDFView.currentScale === UNKNOWN_SCALE) {
// Scale was not initialized: invalid bookmark or scale was not specified.
// Setting the default one.
this.parseScale(DEFAULT_SCALE, true);
this.parseScale(DEFAULT_SCALE, true, true);
}
},
@ -1372,15 +1389,28 @@ var PDFView = {
enterPresentationMode: function pdfViewEnterPresentationMode() {
this.isPresentationMode = true;
this.page = this.presentationModeArgs.page;
this.parseScale('page-fit', true);
// Since 'resize' events are fired when entering presentation mode,
// add this call to the end of the rendering queue to prevent
// the page from being scrolled partially out of view.
setTimeout(function() {
this.page = this.presentationModeArgs.page;
}.bind(this), 0);
this.showPresentationControls();
},
exitPresentationMode: function pdfViewExitPresentationMode() {
this.isPresentationMode = false;
this.parseScale(this.presentationModeArgs.previousScale);
this.page = this.page;
var currentPage = this.pages[this.page - 1];
this.parseScale(this.presentationModeArgs.previousScale, true, true);
// Since 'resize' events are fired when exiting from presentation mode,
// add this call to the end of the rendering queue to make sure
// that the current page is scrolled into view properly.
setTimeout(function() {
currentPage.scrollIntoView();
}, 0);
this.clearMouseScrollState();
this.hidePresentationControls();
this.presentationModeArgs = null;
@ -1434,14 +1464,9 @@ var PDFView = {
this.renderHighestPriority();
var currentPage = this.pages[this.page - 1];
if (!currentPage) {
return;
}
// Wait for presentation mode to take effect
setTimeout(function() {
if (currentPage) {
currentPage.scrollIntoView();
}, 0);
}
},
/**
@ -2490,9 +2515,10 @@ function updateViewarea() {
window.addEventListener('resize', function webViewerResize(evt) {
if (PDFView.initialized &&
(document.getElementById('pageWidthOption').selected ||
document.getElementById('pageFitOption').selected ||
document.getElementById('pageAutoOption').selected))
PDFView.parseScale(document.getElementById('scaleSelect').value);
document.getElementById('pageFitOption').selected ||
document.getElementById('pageAutoOption').selected)) {
PDFView.parseScale(document.getElementById('scaleSelect').value);
}
updateViewarea();
});
@ -2567,11 +2593,11 @@ window.addEventListener('scalechange', function scalechange(evt) {
customScaleOption.selected = false;
if (!evt.resetAutoSettings &&
(document.getElementById('pageWidthOption').selected ||
document.getElementById('pageFitOption').selected ||
document.getElementById('pageAutoOption').selected)) {
updateViewarea();
return;
(document.getElementById('pageWidthOption').selected ||
document.getElementById('pageFitOption').selected ||
document.getElementById('pageAutoOption').selected)) {
updateViewarea();
return;
}
var predefinedValueFound = selectScaleOption('' + evt.scale);