Refactoring of printing code and mozPrintCallback polyfill #7697
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,155 @@ | ||
| /* Copyright 2016 Mozilla Foundation | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
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| 'use strict'; | ||
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| (function (root, factory) { | ||
| if (typeof define === 'function' && define.amd) { | ||
| define('pdfjs-web/firefox_print_service', ['exports', 'pdfjs-web/ui_utils', | ||
| 'pdfjs-web/app', 'pdfjs-web/pdfjs'], factory); | ||
| } else if (typeof exports !== 'undefined') { | ||
| factory(exports, require('./ui_utils.js'), require('./app.js'), | ||
| require('./pdfjs.js')); | ||
| } else { | ||
| factory((root.pdfjsWebFirefoxPrintService = {}), root.pdfjsWebUIUtils, | ||
| root.pdfjsWebApp, root.pdfjsWebPDFJS); | ||
| } | ||
| }(this, function (exports, uiUtils, app, pdfjsLib) { | ||
| var CSS_UNITS = uiUtils.CSS_UNITS; | ||
| var PDFPrintServiceFactory = app.PDFPrintServiceFactory; | ||
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| // Creates a placeholder with div and canvas with right size for the page. | ||
| function composePage(pdfDocument, pageNumber, size, printContainer) { | ||
| var canvas = document.createElement('canvas'); | ||
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| // The size of the canvas in pixels for printing. | ||
| var PRINT_RESOLUTION = 150; | ||
| var PRINT_UNITS = PRINT_RESOLUTION / 72.0; | ||
| canvas.width = Math.floor(size.width * PRINT_UNITS); | ||
| canvas.height = Math.floor(size.height * PRINT_UNITS); | ||
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| // The physical size of the canvas as specified by the PDF document. | ||
| canvas.style.width = Math.floor(size.width * CSS_UNITS) + 'px'; | ||
| canvas.style.height = Math.floor(size.height * CSS_UNITS) + 'px'; | ||
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| var canvasWrapper = document.createElement('div'); | ||
| canvasWrapper.appendChild(canvas); | ||
| printContainer.appendChild(canvasWrapper); | ||
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| canvas.mozPrintCallback = function(obj) { | ||
| // Printing/rendering the page. | ||
| var ctx = obj.context; | ||
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| ctx.save(); | ||
| ctx.fillStyle = 'rgb(255, 255, 255)'; | ||
| ctx.fillRect(0, 0, canvas.width, canvas.height); | ||
| ctx.restore(); | ||
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| pdfDocument.getPage(pageNumber).then(function (pdfPage) { | ||
| var renderContext = { | ||
| canvasContext: ctx, | ||
| transform: [PRINT_UNITS, 0, 0, PRINT_UNITS, 0, 0], | ||
| viewport: pdfPage.getViewport(1), | ||
| intent: 'print' | ||
| }; | ||
| return pdfPage.render(renderContext).promise; | ||
| }).then(function() { | ||
| // Tell the printEngine that rendering this canvas/page has finished. | ||
| obj.done(); | ||
| }, function(error) { | ||
| console.error(error); | ||
| // Tell the printEngine that rendering this canvas/page has failed. | ||
| // This will make the print process stop. | ||
| if ('abort' in obj) { | ||
| obj.abort(); | ||
| } else { | ||
| obj.done(); | ||
| } | ||
| }); | ||
| }; | ||
| } | ||
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| function FirefoxPrintService(pdfDocument, pagesOverview, printContainer) { | ||
| this.pdfDocument = pdfDocument; | ||
| this.pagesOverview = pagesOverview; | ||
| this.printContainer = printContainer; | ||
| this.pageStyleSheet = null; | ||
| } | ||
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| FirefoxPrintService.prototype = { | ||
| layout: function () { | ||
| var pdfDocument = this.pdfDocument; | ||
| var printContainer = this.printContainer; | ||
| var body = document.querySelector('body'); | ||
| body.setAttribute('data-pdfjsprinting', true); | ||
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| var hasEqualPageSizes = this.pagesOverview.every(function (size) { | ||
| return size.width === this.pagesOverview[0].width && | ||
| size.height === this.pagesOverview[0].height; | ||
| }, this); | ||
| if (!hasEqualPageSizes) { | ||
| console.warn('Not all pages have the same size. The printed ' + | ||
| 'result may be incorrect!'); | ||
|
There was a problem hiding this comment. Nit: remove one space |
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| } | ||
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| // Insert a @page + size rule to make sure that the page size is correctly | ||
| // set. Note that we assume that all pages have the same size, because | ||
| // variable-size pages are not supported yet (e.g. in Chrome & Firefox). | ||
| // TODO(robwu): Use named pages when size calculation bugs get resolved | ||
| // (e.g. https://crbug.com/355116) AND when support for named pages is | ||
| // added (http://www.w3.org/TR/css3-page/#using-named-pages). | ||
| // In browsers where @page + size is not supported (such as Firefox, | ||
| // https://bugzil.la/851441), the next stylesheet will be ignored and the | ||
| // user has to select the correct paper size in the UI if wanted. | ||
| this.pageStyleSheet = document.createElement('style'); | ||
| var pageSize = this.pagesOverview[0]; | ||
| this.pageStyleSheet.textContent = | ||
| // "size:<width> <height>" is what we need. But also add "A4" because | ||
| // Firefox incorrectly reports support for the other value. | ||
| '@supports ((size:A4) and (size:1pt 1pt)) {' + | ||
| '@page { size: ' + pageSize.width + 'pt ' + pageSize.height + 'pt;}' + | ||
| '}'; | ||
| body.appendChild(this.pageStyleSheet); | ||
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| for (var i = 0, ii = this.pagesOverview.length; i < ii; ++i) { | ||
| composePage(pdfDocument, i + 1, this.pagesOverview[i], printContainer); | ||
| } | ||
| }, | ||
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| destroy: function () { | ||
| this.printContainer.textContent = ''; | ||
| if (this.pageStyleSheet && this.pageStyleSheet.parentNode) { | ||
| this.pageStyleSheet.parentNode.removeChild(this.pageStyleSheet); | ||
| this.pageStyleSheet = null; | ||
| } | ||
| } | ||
| }; | ||
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| PDFPrintServiceFactory.instance = { | ||
| get supportsPrinting() { | ||
| var canvas = document.createElement('canvas'); | ||
| var value = 'mozPrintCallback' in canvas; | ||
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| return pdfjsLib.shadow(this, 'supportsPrinting', value); | ||
| }, | ||
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| createPrintService: function (pdfDocument, pagesOverview, printContainer) { | ||
| return new FirefoxPrintService(pdfDocument, pagesOverview, | ||
| printContainer); | ||
| } | ||
| }; | ||
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| exports.FirefoxPrintService = FirefoxPrintService; | ||
| })); | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -540,59 +540,6 @@ var PDFPageView = (function PDFPageViewClosure() { | |
| } | ||
| return promise; | ||
| }, | ||
| }; | ||
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| return PDFPageView; | ||
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This is called
renderPageinpdf_print_service.js. Can we name itrenderPagehere too for consistency?There was a problem hiding this comment.
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Not really, I added a comments to pdf_print_service