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Use css to initially scale on zoom.

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This commit is contained in:
Brendan Dahl 2013-10-02 09:05:46 -07:00
parent 0cd4874df6
commit df249da923
3 changed files with 131 additions and 29 deletions
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91
web/page_view.js
View file

@ -17,7 +17,7 @@
/* globals RenderingStates, PDFView, PDFHistory, PDFFindBar, PDFJS, mozL10n,
CustomStyle, PresentationMode, scrollIntoView, SCROLLBAR_PADDING,
CSS_UNITS, UNKNOWN_SCALE, DEFAULT_SCALE, getOutputScale,
TextLayerBuilder, cache, Stats */
TextLayerBuilder, cache, Stats, USE_ONLY_CSS_ZOOM */
'use strict';
@ -36,6 +36,8 @@ var PageView = function pageView(container, id, scale,
this.textContent = null;
this.textLayer = null;
this.zoomLayer = null;
this.annotationLayer = null;
var anchor = document.createElement('a');
@ -53,42 +55,36 @@ var PageView = function pageView(container, id, scale,
this.setPdfPage = function pageViewSetPdfPage(pdfPage) {
this.pdfPage = pdfPage;
this.pdfPageRotate = pdfPage.rotate;
this.viewport = pdfPage.getViewport(this.scale);
this.viewport = pdfPage.getViewport(this.scale * CSS_UNITS);
this.stats = pdfPage.stats;
this.update();
this.reset();
};
this.destroy = function pageViewDestroy() {
this.update();
this.zoomLayer = null;
this.reset();
if (this.pdfPage) {
this.pdfPage.destroy();
}
};
this.update = function pageViewUpdate(scale, rotation) {
this.reset = function pageViewReset() {
if (this.renderTask) {
this.renderTask.cancel();
}
this.resume = null;
this.renderingState = RenderingStates.INITIAL;
if (typeof rotation !== 'undefined') {
this.rotation = rotation;
}
this.scale = scale || this.scale;
var totalRotation = (this.rotation + this.pdfPageRotate) % 360;
this.viewport = this.viewport.clone({
scale: this.scale,
rotation: totalRotation
});
div.style.width = Math.floor(this.viewport.width) + 'px';
div.style.height = Math.floor(this.viewport.height) + 'px';
while (div.hasChildNodes()) {
div.removeChild(div.lastChild);
var childNodes = div.childNodes;
for (var i = div.childNodes.length - 1; i >= 0; i--) {
var node = childNodes[i];
if (this.zoomLayer && this.zoomLayer === node) {
continue;
}
div.removeChild(node);
}
div.removeAttribute('data-loaded');
@ -101,6 +97,47 @@ var PageView = function pageView(container, id, scale,
div.appendChild(this.loadingIconDiv);
};
this.update = function pageViewUpdate(scale, rotation) {
this.scale = scale || this.scale;
if (typeof rotation !== 'undefined') {
this.rotation = rotation;
}
var totalRotation = (this.rotation + this.pdfPageRotate) % 360;
this.viewport = this.viewport.clone({
scale: this.scale * CSS_UNITS,
rotation: totalRotation
});
if (USE_ONLY_CSS_ZOOM && this.canvas) {
this.cssZoom(this.canvas);
return;
} else if (this.canvas && !this.zoomLayer) {
this.zoomLayer = this.canvas.parentNode;
this.zoomLayer.style.position = 'absolute';
}
if (this.zoomLayer) {
this.cssZoom(this.zoomLayer.firstChild);
}
this.reset();
};
this.cssZoom = function pageViewRescale(canvas) {
// Need to adjust canvas, canvas wrapepr, and page container.
canvas.style.width = canvas.parentNode.style.width = div.style.width =
Math.floor(this.viewport.width) + 'px';
canvas.style.height = canvas.parentNode.style.height = div.style.height =
Math.floor(this.viewport.height) + 'px';
if (this.textLayer) {
var scale = (this.viewport.width / canvas.width);
var cssScale = 'scale(' + scale + ', ' + scale + ')';
var textLayerDiv = this.textLayer.textLayerDiv;
CustomStyle.setProp('transform', textLayerDiv, cssScale);
CustomStyle.setProp('transformOrigin', textLayerDiv, '0% 0%');
}
};
Object.defineProperty(this, 'width', {
get: function PageView_getWidth() {
return this.viewport.width;
@ -360,8 +397,15 @@ var PageView = function pageView(container, id, scale,
var ctx = canvas.getContext('2d');
var outputScale = getOutputScale(ctx);
canvas.width = Math.floor(viewport.width) * outputScale.sx;
canvas.height = Math.floor(viewport.height) * outputScale.sy;
if (USE_ONLY_CSS_ZOOM) {
// Use a scale that will give a 100% width canvas.
outputScale.sx *= 1 / (viewport.scale / CSS_UNITS);
outputScale.sy *= 1 / (viewport.scale / CSS_UNITS);
outputScale.scaled = true;
}
canvas.width = Math.floor(viewport.width * outputScale.sx);
canvas.height = Math.floor(viewport.height * outputScale.sy);
canvas.style.width = Math.floor(viewport.width) + 'px';
canvas.style.height = Math.floor(viewport.height) + 'px';
@ -421,6 +465,11 @@ var PageView = function pageView(container, id, scale,
delete self.loadingIconDiv;
}
if (self.zoomLayer) {
div.removeChild(self.zoomLayer);
self.zoomLayer = null;
}
//#if (FIREFOX || MOZCENTRAL)
// if (checkIfDocumentFontsUsed && PDFView.pdfDocument.embeddedFontsUsed &&
// PDFJS.disableFontFace) {

16
web/viewer.js
View file

@ -35,6 +35,10 @@ var MAX_SCALE = 4.0;
var SETTINGS_MEMORY = 20;
var SCALE_SELECT_CONTAINER_PADDING = 8;
var SCALE_SELECT_PADDING = 22;
var USE_ONLY_CSS_ZOOM = false;
//#if B2G
//USE_ONLY_CSS_ZOOM = true;
//#endif
var RenderingStates = {
INITIAL: 0,
RUNNING: 1,
@ -181,7 +185,7 @@ var PDFView = {
var pages = this.pages;
for (var i = 0; i < pages.length; i++)
pages[i].update(val * CSS_UNITS);
pages[i].update(val);
if (!noScroll && this.currentScale != val)
this.pages[this.page - 1].scrollIntoView();
@ -212,9 +216,9 @@ var PDFView = {
}
var pageWidthScale = (container.clientWidth - SCROLLBAR_PADDING) /
currentPage.width * currentPage.scale / CSS_UNITS;
currentPage.width * currentPage.scale;
var pageHeightScale = (container.clientHeight - VERTICAL_PADDING) /
currentPage.height * currentPage.scale / CSS_UNITS;
currentPage.height * currentPage.scale;
switch (value) {
case 'page-actual':
scale = 1;
@ -803,7 +807,7 @@ var PDFView = {
// Fetch a single page so we can get a viewport that will be the default
// viewport for all pages
firstPagePromise.then(function(pdfPage) {
var viewport = pdfPage.getViewport(scale || 1.0);
var viewport = pdfPage.getViewport((scale || 1.0) * CSS_UNITS);
var pagePromises = [];
for (var pageNum = 1; pageNum <= pagesCount; ++pageNum) {
var viewportClone = viewport.clone();
@ -1500,6 +1504,10 @@ document.addEventListener('DOMContentLoaded', function webViewerLoad(evt) {
PDFJS.disableHistory = (hashParams['disableHistory'] === 'true');
}
if ('useOnlyCssZoom' in hashParams) {
USE_ONLY_CSS_ZOOM = (hashParams['useOnlyCssZoom'] === 'true');
}
//#if !(FIREFOX || MOZCENTRAL)
var locale = navigator.language;
if ('locale' in hashParams)