yetangitu/pdf.js
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Moves pdfDocument.getPage/getTextContent requests out of PDFView

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This commit is contained in:
Yury Delendik 2014-09-15 09:49:24 -05:00
parent 7af8748151
commit 7642c39734
5 changed files with 204 additions and 134 deletions
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149
web/pdf_viewer.js
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@ -17,7 +17,7 @@
/*globals watchScroll, Cache, DEFAULT_CACHE_SIZE, PageView, UNKNOWN_SCALE,
IGNORE_CURRENT_POSITION_ON_ZOOM, SCROLLBAR_PADDING, VERTICAL_PADDING,
MAX_AUTO_SCALE, getVisibleElements, PresentationMode,
RenderingStates */
RenderingStates, Promise, CSS_UNITS, PDFJS */
'use strict';
@ -29,11 +29,7 @@ var PDFViewer = (function pdfViewer() {
this.linkService = options.linkService;
this.scroll = watchScroll(this.container, this._scrollUpdate.bind(this));
this.pages = [];
this.cache = new Cache(DEFAULT_CACHE_SIZE);
this.currentPageNumber = 1;
this.previousPageNumber = 1;
this.updateInProgress = true;
this.updateInProgress = false;
this.resetView();
}
@ -42,6 +38,10 @@ var PDFViewer = (function pdfViewer() {
return this.pages.length;
},
getPageView: function (index) {
return this.pages[index];
},
setCurrentPageNumber: function (val) {
var event = document.createEvent('UIEvents');
event.initUIEvent('pagechange', true, true, window, 0);
@ -61,18 +61,114 @@ var PDFViewer = (function pdfViewer() {
this.container.dispatchEvent(event);
},
addPage: function (pageNum, scale, viewport) {
var pageView = new PageView(this.viewer, pageNum, scale, viewport,
this.linkService, this.renderingQueue,
this.cache, this);
this.pages.push(pageView);
return pageView;
setDocument: function (pdfDocument) {
if (this.pdfDocument) {
this.resetView();
}
this.pdfDocument = pdfDocument;
if (!pdfDocument) {
return;
}
var pagesCount = pdfDocument.numPages;
var pagesRefMap = this.pagesRefMap = {};
var self = this;
var resolvePagesPromise;
var pagesPromise = new Promise(function (resolve) {
resolvePagesPromise = resolve;
});
this.pagesPromise = pagesPromise;
pagesPromise.then(function () {
var event = document.createEvent('CustomEvent');
event.initCustomEvent('pagesloaded', true, true, {
pagesCount: pagesCount
});
self.container.dispatchEvent(event);
});
var isOnePageRenderedResolved = false;
var resolveOnePageRendered = null;
var onePageRendered = new Promise(function (resolve) {
resolveOnePageRendered = resolve;
});
this.onePageRendered = onePageRendered;
var bindOnAfterDraw = function (pageView) {
// when page is painted, using the image as thumbnail base
pageView.onAfterDraw = function pdfViewLoadOnAfterDraw() {
if (!isOnePageRenderedResolved) {
isOnePageRenderedResolved = true;
resolveOnePageRendered();
}
var event = document.createEvent('CustomEvent');
event.initCustomEvent('pagerendered', true, true, {
pageNumber: pageView.id
});
self.container.dispatchEvent(event);
};
};
var firstPagePromise = pdfDocument.getPage(1);
this.firstPagePromise = firstPagePromise;
// Fetch a single page so we can get a viewport that will be the default
// viewport for all pages
return firstPagePromise.then(function(pdfPage) {
var scale = this.currentScale || 1.0;
var viewport = pdfPage.getViewport(scale * CSS_UNITS);
for (var pageNum = 1; pageNum <= pagesCount; ++pageNum) {
var pageSource = new PDFPageSource(pdfDocument, pageNum);
var pageView = new PageView(this.viewer, pageNum, scale,
viewport.clone(), this.linkService,
this.renderingQueue, this.cache,
pageSource, this);
bindOnAfterDraw(pageView);
this.pages.push(pageView);
}
// Fetch all the pages since the viewport is needed before printing
// starts to create the correct size canvas. Wait until one page is
// rendered so we don't tie up too many resources early on.
onePageRendered.then(function () {
if (!PDFJS.disableAutoFetch) {
var getPagesLeft = pagesCount;
for (var pageNum = 1; pageNum <= pagesCount; ++pageNum) {
pdfDocument.getPage(pageNum).then(function (pageNum, pdfPage) {
var pageView = self.pages[pageNum - 1];
if (!pageView.pdfPage) {
pageView.setPdfPage(pdfPage);
}
var refStr = pdfPage.ref.num + ' ' + pdfPage.ref.gen + ' R';
pagesRefMap[refStr] = pageNum;
getPagesLeft--;
if (!getPagesLeft) {
resolvePagesPromise();
}
}.bind(null, pageNum));
}
} else {
// XXX: Printing is semi-broken with auto fetch disabled.
resolvePagesPromise();
}
});
}.bind(this));
},
resetView: function () {
this.cache = new Cache(DEFAULT_CACHE_SIZE);
this.pages = [];
this.currentPageNumber = 1;
this.previousPageNumber = 1;
this.currentScale = UNKNOWN_SCALE;
this.currentScaleValue = null;
this.location = null;
var container = this.viewer;
while (container.hasChildNodes()) {
container.removeChild(container.lastChild);
}
},
_scrollUpdate: function () {
@ -171,14 +267,6 @@ var PDFViewer = (function pdfViewer() {
this.setScale(this.currentScaleValue, true, true);
},
removeAllPages: function () {
var container = this.viewer;
while (container.hasChildNodes()) {
container.removeChild(container.lastChild);
}
this.pages = [];
},
updateLocation: function (firstPage) {
var currentScale = this.currentScale;
var currentScaleValue = this.currentScaleValue;
@ -308,7 +396,28 @@ var PDFViewer = (function pdfViewer() {
return;
}
},
getPageTextContent: function (pageIndex) {
return this.pdfDocument.getPage(pageIndex + 1).then(function (page) {
return page.getTextContent();
});
},
};
return PDFViewer;
})();
var PDFPageSource = (function PDFPageSourceClosure() {
function PDFPageSource(pdfDocument, pageNumber) {
this.pdfDocument = pdfDocument;
this.pageNumber = pageNumber;
}
PDFPageSource.prototype = {
getPage: function () {
return this.pdfDocument.getPage(this.pageNumber);
}
};
return PDFPageSource;
})();