546 lines
18 KiB
JavaScript
546 lines
18 KiB
JavaScript
/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
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/* Copyright 2012 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* globals RenderingStates, PDFJS, CustomStyle, CSS_UNITS, getOutputScale,
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TextLayerBuilder, AnnotationsLayerBuilder, Promise */
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'use strict';
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var TEXT_LAYER_RENDER_DELAY = 200; // ms
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/**
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* @typedef {Object} PDFPageViewOptions
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* @property {HTMLDivElement} container - The viewer element.
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* @property {number} id - The page unique ID (normally its number).
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* @property {number} scale - The page scale display.
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* @property {PageViewport} defaultViewport - The page viewport.
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* @property {PDFRenderingQueue} renderingQueue - The rendering queue object.
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* @property {IPDFTextLayerFactory} textLayerFactory
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* @property {IPDFAnnotationsLayerFactory} annotationsLayerFactory
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*/
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/**
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* @class
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* @implements {IRenderableView}
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*/
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var PDFPageView = (function PDFPageViewClosure() {
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/**
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* @constructs PDFPageView
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* @param {PDFPageViewOptions} options
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*/
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function PDFPageView(options) {
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var container = options.container;
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var id = options.id;
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var scale = options.scale;
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var defaultViewport = options.defaultViewport;
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var renderingQueue = options.renderingQueue;
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var textLayerFactory = options.textLayerFactory;
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var annotationsLayerFactory = options.annotationsLayerFactory;
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this.id = id;
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this.renderingId = 'page' + id;
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this.rotation = 0;
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this.scale = scale || 1.0;
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this.viewport = defaultViewport;
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this.pdfPageRotate = defaultViewport.rotation;
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this.hasRestrictedScaling = false;
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this.renderingQueue = renderingQueue;
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this.textLayerFactory = textLayerFactory;
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this.annotationsLayerFactory = annotationsLayerFactory;
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this.renderingState = RenderingStates.INITIAL;
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this.resume = null;
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this.onBeforeDraw = null;
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this.onAfterDraw = null;
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this.textLayer = null;
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this.zoomLayer = null;
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this.annotationLayer = null;
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var div = document.createElement('div');
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div.id = 'pageContainer' + this.id;
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div.className = 'page';
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div.style.width = Math.floor(this.viewport.width) + 'px';
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div.style.height = Math.floor(this.viewport.height) + 'px';
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this.div = div;
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container.appendChild(div);
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}
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PDFPageView.prototype = {
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setPdfPage: function PDFPageView_setPdfPage(pdfPage) {
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this.pdfPage = pdfPage;
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this.pdfPageRotate = pdfPage.rotate;
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var totalRotation = (this.rotation + this.pdfPageRotate) % 360;
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this.viewport = pdfPage.getViewport(this.scale * CSS_UNITS,
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totalRotation);
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this.stats = pdfPage.stats;
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this.reset();
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},
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destroy: function PDFPageView_destroy() {
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this.zoomLayer = null;
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this.reset();
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if (this.pdfPage) {
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this.pdfPage.destroy();
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}
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},
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reset: function PDFPageView_reset(keepAnnotations) {
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if (this.renderTask) {
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this.renderTask.cancel();
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}
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this.resume = null;
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this.renderingState = RenderingStates.INITIAL;
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var div = this.div;
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div.style.width = Math.floor(this.viewport.width) + 'px';
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div.style.height = Math.floor(this.viewport.height) + 'px';
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var childNodes = div.childNodes;
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var currentZoomLayer = this.zoomLayer || null;
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var currentAnnotationNode = (keepAnnotations && this.annotationLayer &&
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this.annotationLayer.div) || null;
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for (var i = childNodes.length - 1; i >= 0; i--) {
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var node = childNodes[i];
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if (currentZoomLayer === node || currentAnnotationNode === node) {
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continue;
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}
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div.removeChild(node);
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}
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div.removeAttribute('data-loaded');
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if (keepAnnotations) {
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if (this.annotationLayer) {
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// Hide annotationLayer until all elements are resized
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// so they are not displayed on the already-resized page
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this.annotationLayer.hide();
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}
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} else {
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this.annotationLayer = null;
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}
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if (this.canvas) {
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// Zeroing the width and height causes Firefox to release graphics
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// resources immediately, which can greatly reduce memory consumption.
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this.canvas.width = 0;
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this.canvas.height = 0;
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delete this.canvas;
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}
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this.loadingIconDiv = document.createElement('div');
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this.loadingIconDiv.className = 'loadingIcon';
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div.appendChild(this.loadingIconDiv);
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},
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update: function PDFPageView_update(scale, rotation) {
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this.scale = scale || this.scale;
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if (typeof rotation !== 'undefined') {
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this.rotation = rotation;
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}
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var totalRotation = (this.rotation + this.pdfPageRotate) % 360;
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this.viewport = this.viewport.clone({
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scale: this.scale * CSS_UNITS,
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rotation: totalRotation
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});
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var isScalingRestricted = false;
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if (this.canvas && PDFJS.maxCanvasPixels > 0) {
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var ctx = this.canvas.getContext('2d');
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var outputScale = getOutputScale(ctx);
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var pixelsInViewport = this.viewport.width * this.viewport.height;
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var maxScale = Math.sqrt(PDFJS.maxCanvasPixels / pixelsInViewport);
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if (((Math.floor(this.viewport.width) * outputScale.sx) | 0) *
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((Math.floor(this.viewport.height) * outputScale.sy) | 0) >
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PDFJS.maxCanvasPixels) {
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isScalingRestricted = true;
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}
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}
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if (this.canvas &&
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(PDFJS.useOnlyCssZoom ||
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(this.hasRestrictedScaling && isScalingRestricted))) {
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this.cssTransform(this.canvas, true);
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return;
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} else if (this.canvas && !this.zoomLayer) {
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this.zoomLayer = this.canvas.parentNode;
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this.zoomLayer.style.position = 'absolute';
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}
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if (this.zoomLayer) {
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this.cssTransform(this.zoomLayer.firstChild);
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}
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this.reset(true);
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},
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/**
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* Called when moved in the parent's container.
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*/
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updatePosition: function PDFPageView_updatePosition() {
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if (this.textLayer) {
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this.textLayer.render(TEXT_LAYER_RENDER_DELAY);
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}
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},
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cssTransform: function PDFPageView_transform(canvas, redrawAnnotations) {
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// Scale canvas, canvas wrapper, and page container.
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var width = this.viewport.width;
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var height = this.viewport.height;
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var div = this.div;
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canvas.style.width = canvas.parentNode.style.width = div.style.width =
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Math.floor(width) + 'px';
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canvas.style.height = canvas.parentNode.style.height = div.style.height =
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Math.floor(height) + 'px';
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// The canvas may have been originally rotated, rotate relative to that.
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var relativeRotation = this.viewport.rotation - canvas._viewport.rotation;
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var absRotation = Math.abs(relativeRotation);
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var scaleX = 1, scaleY = 1;
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if (absRotation === 90 || absRotation === 270) {
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// Scale x and y because of the rotation.
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scaleX = height / width;
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scaleY = width / height;
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}
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var cssTransform = 'rotate(' + relativeRotation + 'deg) ' +
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'scale(' + scaleX + ',' + scaleY + ')';
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CustomStyle.setProp('transform', canvas, cssTransform);
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if (this.textLayer) {
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// Rotating the text layer is more complicated since the divs inside the
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// the text layer are rotated.
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// TODO: This could probably be simplified by drawing the text layer in
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// one orientation then rotating overall.
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var textLayerViewport = this.textLayer.viewport;
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var textRelativeRotation = this.viewport.rotation -
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textLayerViewport.rotation;
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var textAbsRotation = Math.abs(textRelativeRotation);
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var scale = width / textLayerViewport.width;
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if (textAbsRotation === 90 || textAbsRotation === 270) {
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scale = width / textLayerViewport.height;
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}
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var textLayerDiv = this.textLayer.textLayerDiv;
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var transX, transY;
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switch (textAbsRotation) {
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case 0:
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transX = transY = 0;
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break;
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case 90:
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transX = 0;
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transY = '-' + textLayerDiv.style.height;
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break;
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case 180:
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transX = '-' + textLayerDiv.style.width;
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transY = '-' + textLayerDiv.style.height;
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break;
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case 270:
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transX = '-' + textLayerDiv.style.width;
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transY = 0;
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break;
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default:
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console.error('Bad rotation value.');
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break;
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}
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CustomStyle.setProp('transform', textLayerDiv,
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'rotate(' + textAbsRotation + 'deg) ' +
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'scale(' + scale + ', ' + scale + ') ' +
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'translate(' + transX + ', ' + transY + ')');
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CustomStyle.setProp('transformOrigin', textLayerDiv, '0% 0%');
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}
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if (redrawAnnotations && this.annotationLayer) {
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this.annotationLayer.setupAnnotations(this.viewport);
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}
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},
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get width() {
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return this.viewport.width;
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},
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get height() {
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return this.viewport.height;
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},
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getPagePoint: function PDFPageView_getPagePoint(x, y) {
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return this.viewport.convertToPdfPoint(x, y);
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},
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draw: function PDFPageView_draw() {
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if (this.renderingState !== RenderingStates.INITIAL) {
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console.error('Must be in new state before drawing');
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}
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this.renderingState = RenderingStates.RUNNING;
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var pdfPage = this.pdfPage;
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var viewport = this.viewport;
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var div = this.div;
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// Wrap the canvas so if it has a css transform for highdpi the overflow
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// will be hidden in FF.
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var canvasWrapper = document.createElement('div');
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canvasWrapper.style.width = div.style.width;
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canvasWrapper.style.height = div.style.height;
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canvasWrapper.classList.add('canvasWrapper');
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var canvas = document.createElement('canvas');
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canvas.id = 'page' + this.id;
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canvasWrapper.appendChild(canvas);
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if (this.annotationLayer) {
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// annotationLayer needs to stay on top
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div.insertBefore(canvasWrapper, this.annotationLayer.div);
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} else {
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div.appendChild(canvasWrapper);
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}
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this.canvas = canvas;
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var ctx = canvas.getContext('2d');
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var outputScale = getOutputScale(ctx);
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if (PDFJS.useOnlyCssZoom) {
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var actualSizeViewport = viewport.clone({ scale: CSS_UNITS });
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// Use a scale that will make the canvas be the original intended size
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// of the page.
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outputScale.sx *= actualSizeViewport.width / viewport.width;
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outputScale.sy *= actualSizeViewport.height / viewport.height;
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outputScale.scaled = true;
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}
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if (PDFJS.maxCanvasPixels > 0) {
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var pixelsInViewport = viewport.width * viewport.height;
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var maxScale = Math.sqrt(PDFJS.maxCanvasPixels / pixelsInViewport);
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if (outputScale.sx > maxScale || outputScale.sy > maxScale) {
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outputScale.sx = maxScale;
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outputScale.sy = maxScale;
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outputScale.scaled = true;
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this.hasRestrictedScaling = true;
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} else {
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this.hasRestrictedScaling = false;
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}
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}
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canvas.width = (Math.floor(viewport.width) * outputScale.sx) | 0;
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canvas.height = (Math.floor(viewport.height) * outputScale.sy) | 0;
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canvas.style.width = Math.floor(viewport.width) + 'px';
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canvas.style.height = Math.floor(viewport.height) + 'px';
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// Add the viewport so it's known what it was originally drawn with.
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canvas._viewport = viewport;
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var textLayerDiv = null;
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var textLayer = null;
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if (this.textLayerFactory) {
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textLayerDiv = document.createElement('div');
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textLayerDiv.className = 'textLayer';
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textLayerDiv.style.width = canvas.style.width;
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textLayerDiv.style.height = canvas.style.height;
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if (this.annotationLayer) {
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// annotationLayer needs to stay on top
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div.insertBefore(textLayerDiv, this.annotationLayer.div);
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} else {
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div.appendChild(textLayerDiv);
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}
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textLayer = this.textLayerFactory.createTextLayerBuilder(textLayerDiv,
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this.id - 1,
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this.viewport);
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}
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this.textLayer = textLayer;
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// TODO(mack): use data attributes to store these
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ctx._scaleX = outputScale.sx;
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ctx._scaleY = outputScale.sy;
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if (outputScale.scaled) {
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ctx.scale(outputScale.sx, outputScale.sy);
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}
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var resolveRenderPromise, rejectRenderPromise;
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var promise = new Promise(function (resolve, reject) {
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resolveRenderPromise = resolve;
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rejectRenderPromise = reject;
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});
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// Rendering area
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var self = this;
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function pageViewDrawCallback(error) {
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// The renderTask may have been replaced by a new one, so only remove
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// the reference to the renderTask if it matches the one that is
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// triggering this callback.
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if (renderTask === self.renderTask) {
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self.renderTask = null;
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}
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if (error === 'cancelled') {
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rejectRenderPromise(error);
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return;
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}
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self.renderingState = RenderingStates.FINISHED;
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if (self.loadingIconDiv) {
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div.removeChild(self.loadingIconDiv);
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delete self.loadingIconDiv;
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}
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if (self.zoomLayer) {
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div.removeChild(self.zoomLayer);
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self.zoomLayer = null;
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}
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self.error = error;
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self.stats = pdfPage.stats;
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if (self.onAfterDraw) {
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self.onAfterDraw();
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}
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var event = document.createEvent('CustomEvent');
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event.initCustomEvent('pagerendered', true, true, {
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pageNumber: self.id
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});
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div.dispatchEvent(event);
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//#if GENERIC
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// This custom event is deprecated, and will be removed in the future,
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// please use the |pagerendered| event instead.
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var deprecatedEvent = document.createEvent('CustomEvent');
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deprecatedEvent.initCustomEvent('pagerender', true, true, {
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pageNumber: pdfPage.pageNumber
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});
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div.dispatchEvent(deprecatedEvent);
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//#endif
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if (!error) {
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resolveRenderPromise(undefined);
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} else {
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rejectRenderPromise(error);
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}
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}
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var renderContinueCallback = null;
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if (this.renderingQueue) {
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renderContinueCallback = function renderContinueCallback(cont) {
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if (!self.renderingQueue.isHighestPriority(self)) {
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self.renderingState = RenderingStates.PAUSED;
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self.resume = function resumeCallback() {
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self.renderingState = RenderingStates.RUNNING;
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cont();
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};
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return;
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}
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cont();
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};
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}
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var renderContext = {
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canvasContext: ctx,
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viewport: this.viewport,
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// intent: 'default', // === 'display'
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continueCallback: renderContinueCallback
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};
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var renderTask = this.renderTask = this.pdfPage.render(renderContext);
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this.renderTask.promise.then(
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function pdfPageRenderCallback() {
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pageViewDrawCallback(null);
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if (textLayer) {
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self.pdfPage.getTextContent().then(
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function textContentResolved(textContent) {
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textLayer.setTextContent(textContent);
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textLayer.render(TEXT_LAYER_RENDER_DELAY);
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}
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);
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}
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},
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function pdfPageRenderError(error) {
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pageViewDrawCallback(error);
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}
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);
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if (this.annotationsLayerFactory) {
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if (!this.annotationLayer) {
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this.annotationLayer = this.annotationsLayerFactory.
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createAnnotationsLayerBuilder(div, this.pdfPage);
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}
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this.annotationLayer.setupAnnotations(this.viewport);
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}
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div.setAttribute('data-loaded', true);
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if (self.onBeforeDraw) {
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self.onBeforeDraw();
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}
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return promise;
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},
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beforePrint: function PDFPageView_beforePrint() {
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var pdfPage = this.pdfPage;
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var viewport = pdfPage.getViewport(1);
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// Use the same hack we use for high dpi displays for printing to get
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// better output until bug 811002 is fixed in FF.
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var PRINT_OUTPUT_SCALE = 2;
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var canvas = document.createElement('canvas');
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canvas.width = Math.floor(viewport.width) * PRINT_OUTPUT_SCALE;
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canvas.height = Math.floor(viewport.height) * PRINT_OUTPUT_SCALE;
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canvas.style.width = (PRINT_OUTPUT_SCALE * viewport.width) + 'pt';
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canvas.style.height = (PRINT_OUTPUT_SCALE * viewport.height) + 'pt';
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var cssScale = 'scale(' + (1 / PRINT_OUTPUT_SCALE) + ', ' +
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(1 / PRINT_OUTPUT_SCALE) + ')';
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CustomStyle.setProp('transform' , canvas, cssScale);
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CustomStyle.setProp('transformOrigin' , canvas, '0% 0%');
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var printContainer = document.getElementById('printContainer');
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var canvasWrapper = document.createElement('div');
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canvasWrapper.style.width = viewport.width + 'pt';
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canvasWrapper.style.height = viewport.height + 'pt';
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canvasWrapper.appendChild(canvas);
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printContainer.appendChild(canvasWrapper);
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canvas.mozPrintCallback = function(obj) {
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var ctx = obj.context;
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ctx.save();
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ctx.fillStyle = 'rgb(255, 255, 255)';
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ctx.fillRect(0, 0, canvas.width, canvas.height);
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ctx.restore();
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ctx.scale(PRINT_OUTPUT_SCALE, PRINT_OUTPUT_SCALE);
|
|
|
|
var renderContext = {
|
|
canvasContext: ctx,
|
|
viewport: viewport,
|
|
intent: 'print'
|
|
};
|
|
|
|
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 proces stop.
|
|
if ('abort' in obj) {
|
|
obj.abort();
|
|
} else {
|
|
obj.done();
|
|
}
|
|
});
|
|
};
|
|
},
|
|
};
|
|
|
|
return PDFPageView;
|
|
})();
|