Merge pull request #5673 from Snuffleupagus/thumbnail-refactor
Refactor the thumbnail code
This commit is contained in:
Tim van der Meij
commit
a544aed2b0
314
web/pdf_thumbnail_view.js
Normal file
314
web/pdf_thumbnail_view.js
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@ -0,0 +1,314 @@
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/* -*- 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 mozL10n, RenderingStates, Promise */
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'use strict';
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var THUMBNAIL_WIDTH = 98; // px
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var THUMBNAIL_CANVAS_BORDER_WIDTH = 1; // px
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/**
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* @typedef {Object} PDFThumbnailViewOptions
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* @property {HTMLDivElement} container - The viewer element.
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* @property {number} id - The thumbnail's unique ID (normally its number).
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* @property {PageViewport} defaultViewport - The page viewport.
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* @property {IPDFLinkService} linkService - The navigation/linking service.
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* @property {PDFRenderingQueue} renderingQueue - The rendering queue object.
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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 PDFThumbnailView = (function PDFThumbnailViewClosure() {
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function getTempCanvas(width, height) {
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var tempCanvas = PDFThumbnailView.tempImageCache;
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if (!tempCanvas) {
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tempCanvas = document.createElement('canvas');
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PDFThumbnailView.tempImageCache = tempCanvas;
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}
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tempCanvas.width = width;
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tempCanvas.height = height;
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// Since this is a temporary canvas, we need to fill the canvas with a white
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// background ourselves. |_getPageDrawContext| uses CSS rules for this.
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var ctx = tempCanvas.getContext('2d');
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ctx.save();
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ctx.fillStyle = 'rgb(255, 255, 255)';
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ctx.fillRect(0, 0, width, height);
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ctx.restore();
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return tempCanvas;
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}
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/**
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* @constructs PDFThumbnailView
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* @param {PDFThumbnailViewOptions} options
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*/
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function PDFThumbnailView(options) {
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var container = options.container;
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var id = options.id;
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var defaultViewport = options.defaultViewport;
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var linkService = options.linkService;
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var renderingQueue = options.renderingQueue;
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this.id = id;
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this.renderingId = 'thumbnail' + id;
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this.pdfPage = null;
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this.rotation = 0;
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this.viewport = defaultViewport;
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this.pdfPageRotate = defaultViewport.rotation;
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this.linkService = linkService;
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this.renderingQueue = renderingQueue;
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this.hasImage = false;
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this.resume = null;
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this.renderingState = RenderingStates.INITIAL;
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this.pageWidth = this.viewport.width;
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this.pageHeight = this.viewport.height;
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this.pageRatio = this.pageWidth / this.pageHeight;
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this.canvasWidth = THUMBNAIL_WIDTH;
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this.canvasHeight = (this.canvasWidth / this.pageRatio) | 0;
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this.scale = this.canvasWidth / this.pageWidth;
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var anchor = document.createElement('a');
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anchor.href = linkService.getAnchorUrl('#page=' + id);
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anchor.title = mozL10n.get('thumb_page_title', {page: id}, 'Page {{page}}');
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anchor.onclick = function stopNavigation() {
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linkService.page = id;
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return false;
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};
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var div = document.createElement('div');
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div.id = 'thumbnailContainer' + id;
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div.className = 'thumbnail';
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this.el = div; // TODO: replace 'el' property usage.
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this.div = div;
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if (id === 1) {
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// Highlight the thumbnail of the first page when no page number is
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// specified (or exists in cache) when the document is loaded.
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div.classList.add('selected');
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}
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var ring = document.createElement('div');
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ring.className = 'thumbnailSelectionRing';
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var borderAdjustment = 2 * THUMBNAIL_CANVAS_BORDER_WIDTH;
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ring.style.width = this.canvasWidth + borderAdjustment + 'px';
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ring.style.height = this.canvasHeight + borderAdjustment + 'px';
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this.ring = ring;
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div.appendChild(ring);
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anchor.appendChild(div);
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container.appendChild(anchor);
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}
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PDFThumbnailView.prototype = {
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setPdfPage: function PDFThumbnailView_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(1, totalRotation);
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this.reset();
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},
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reset: function PDFThumbnailView_reset() {
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if (this.renderTask) {
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this.renderTask.cancel();
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}
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this.hasImage = false;
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this.resume = null;
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this.renderingState = RenderingStates.INITIAL;
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this.pageWidth = this.viewport.width;
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this.pageHeight = this.viewport.height;
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this.pageRatio = this.pageWidth / this.pageHeight;
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this.canvasHeight = (this.canvasWidth / this.pageRatio) | 0;
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this.scale = (this.canvasWidth / this.pageWidth);
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this.div.removeAttribute('data-loaded');
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var ring = this.ring;
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var childNodes = ring.childNodes;
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for (var i = childNodes.length - 1; i >= 0; i--) {
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ring.removeChild(childNodes[i]);
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}
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var borderAdjustment = 2 * THUMBNAIL_CANVAS_BORDER_WIDTH;
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ring.style.width = this.canvasWidth + borderAdjustment + 'px';
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ring.style.height = this.canvasHeight + borderAdjustment + 'px';
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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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},
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update: function PDFThumbnailView_update(rotation) {
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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: 1,
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rotation: totalRotation
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});
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this.reset();
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},
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/**
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* @private
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*/
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_getPageDrawContext: function PDFThumbnailView_getPageDrawContext() {
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var canvas = document.createElement('canvas');
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canvas.id = this.renderingId;
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canvas.width = this.canvasWidth;
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canvas.height = this.canvasHeight;
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canvas.className = 'thumbnailImage';
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canvas.setAttribute('aria-label', mozL10n.get('thumb_page_canvas',
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{page: this.id}, 'Thumbnail of Page {{page}}'));
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this.canvas = canvas;
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this.div.setAttribute('data-loaded', true);
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this.ring.appendChild(canvas);
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return canvas.getContext('2d');
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},
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draw: function PDFThumbnailView_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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if (this.hasImage) {
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return Promise.resolve(undefined);
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}
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this.hasImage = true;
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this.renderingState = RenderingStates.RUNNING;
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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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var self = this;
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function thumbnailDrawCallback(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 (!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 ctx = this._getPageDrawContext();
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var drawViewport = this.viewport.clone({ scale: this.scale });
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var 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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var renderContext = {
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canvasContext: ctx,
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viewport: drawViewport,
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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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renderTask.promise.then(
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function pdfPageRenderCallback() {
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thumbnailDrawCallback(null);
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},
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function pdfPageRenderError(error) {
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thumbnailDrawCallback(error);
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}
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);
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return promise;
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},
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setImage: function PDFThumbnailView_setImage(pageView) {
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var img = pageView.canvas;
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if (this.hasImage || !img) {
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return;
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}
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if (!this.pdfPage) {
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this.setPdfPage(pageView.pdfPage);
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}
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this.hasImage = true;
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this.renderingState = RenderingStates.FINISHED;
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var ctx = this._getPageDrawContext();
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var canvas = ctx.canvas;
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if (img.width <= 2 * canvas.width) {
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ctx.drawImage(img, 0, 0, img.width, img.height,
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0, 0, canvas.width, canvas.height);
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return;
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}
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// drawImage does an awful job of rescaling the image, doing it gradually.
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var MAX_NUM_SCALING_STEPS = 3;
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var reducedWidth = canvas.width << MAX_NUM_SCALING_STEPS;
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var reducedHeight = canvas.height << MAX_NUM_SCALING_STEPS;
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var reducedImage = getTempCanvas(reducedWidth, reducedHeight);
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var reducedImageCtx = reducedImage.getContext('2d');
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while (reducedWidth > img.width || reducedHeight > img.height) {
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reducedWidth >>= 1;
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reducedHeight >>= 1;
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}
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reducedImageCtx.drawImage(img, 0, 0, img.width, img.height,
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0, 0, reducedWidth, reducedHeight);
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while (reducedWidth > 2 * canvas.width) {
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reducedImageCtx.drawImage(reducedImage,
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0, 0, reducedWidth, reducedHeight,
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0, 0, reducedWidth >> 1, reducedHeight >> 1);
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reducedWidth >>= 1;
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reducedHeight >>= 1;
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}
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ctx.drawImage(reducedImage, 0, 0, reducedWidth, reducedHeight,
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0, 0, canvas.width, canvas.height);
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}
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};
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return PDFThumbnailView;
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})();
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PDFThumbnailView.tempImageCache = null;
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204
web/pdf_thumbnail_viewer.js
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204
web/pdf_thumbnail_viewer.js
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@ -0,0 +1,204 @@
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/* -*- 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 watchScroll, getVisibleElements, scrollIntoView, PDFThumbnailView,
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Promise */
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'use strict';
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var THUMBNAIL_SCROLL_MARGIN = -19;
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//#include pdf_thumbnail_view.js
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/**
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* @typedef {Object} PDFThumbnailViewerOptions
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* @property {HTMLDivElement} container - The container for the thumbnail
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* elements.
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* @property {IPDFLinkService} linkService - The navigation/linking service.
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* @property {PDFRenderingQueue} renderingQueue - The rendering queue object.
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*/
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/**
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* Simple viewer control to display thumbnails for pages.
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* @class
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* @implements {IRenderableView}
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*/
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var PDFThumbnailViewer = (function PDFThumbnailViewerClosure() {
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/**
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* @constructs PDFThumbnailViewer
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* @param {PDFThumbnailViewerOptions} options
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*/
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function PDFThumbnailViewer(options) {
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this.container = options.container;
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this.renderingQueue = options.renderingQueue;
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this.linkService = options.linkService;
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this.scroll = watchScroll(this.container, this._scrollUpdated.bind(this));
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this._resetView();
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}
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PDFThumbnailViewer.prototype = {
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/**
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* @private
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*/
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_scrollUpdated: function PDFThumbnailViewer_scrollUpdated() {
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this.renderingQueue.renderHighestPriority();
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},
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getThumbnail: function PDFThumbnailViewer_getThumbnail(index) {
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return this.thumbnails[index];
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},
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/**
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* @private
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*/
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_getVisibleThumbs: function PDFThumbnailViewer_getVisibleThumbs() {
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return getVisibleElements(this.container, this.thumbnails);
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},
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scrollThumbnailIntoView:
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function PDFThumbnailViewer_scrollThumbnailIntoView(page) {
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var selected = document.querySelector('.thumbnail.selected');
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if (selected) {
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selected.classList.remove('selected');
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}
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var thumbnail = document.getElementById('thumbnailContainer' + page);
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thumbnail.classList.add('selected');
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var visibleThumbs = this._getVisibleThumbs();
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var numVisibleThumbs = visibleThumbs.views.length;
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// If the thumbnail isn't currently visible, scroll it into view.
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if (numVisibleThumbs > 0) {
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var first = visibleThumbs.first.id;
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// Account for only one thumbnail being visible.
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var last = (numVisibleThumbs > 1 ? visibleThumbs.last.id : first);
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if (page <= first || page >= last) {
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scrollIntoView(thumbnail, { top: THUMBNAIL_SCROLL_MARGIN });
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}
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}
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},
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get pagesRotation() {
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return this._pagesRotation;
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},
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set pagesRotation(rotation) {
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this._pagesRotation = rotation;
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for (var i = 0, l = this.thumbnails.length; i < l; i++) {
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var thumb = this.thumbnails[i];
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thumb.update(rotation);
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}
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},
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cleanup: function PDFThumbnailViewer_cleanup() {
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var tempCanvas = PDFThumbnailView.tempImageCache;
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if (tempCanvas) {
|
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// Zeroing the width and height causes Firefox to release graphics
|
||||
// resources immediately, which can greatly reduce memory consumption.
|
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tempCanvas.width = 0;
|
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tempCanvas.height = 0;
|
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}
|
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PDFThumbnailView.tempImageCache = null;
|
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},
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|
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/**
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* @private
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*/
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_resetView: function PDFThumbnailViewer_resetView() {
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this.thumbnails = [];
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this._pagesRotation = 0;
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this._pagesRequests = [];
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},
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setDocument: function PDFThumbnailViewer_setDocument(pdfDocument) {
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if (this.pdfDocument) {
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// cleanup of the elements and views
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var thumbsView = this.container;
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while (thumbsView.hasChildNodes()) {
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thumbsView.removeChild(thumbsView.lastChild);
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}
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this._resetView();
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}
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this.pdfDocument = pdfDocument;
|
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if (!pdfDocument) {
|
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return Promise.resolve();
|
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}
|
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|
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return pdfDocument.getPage(1).then(function (firstPage) {
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var pagesCount = pdfDocument.numPages;
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var viewport = firstPage.getViewport(1.0);
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for (var pageNum = 1; pageNum <= pagesCount; ++pageNum) {
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var thumbnail = new PDFThumbnailView({
|
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container: this.container,
|
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id: pageNum,
|
||||
defaultViewport: viewport.clone(),
|
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linkService: this.linkService,
|
||||
renderingQueue: this.renderingQueue
|
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});
|
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this.thumbnails.push(thumbnail);
|
||||
}
|
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}.bind(this));
|
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},
|
||||
|
||||
/**
|
||||
* @param {PDFPageView} pageView
|
||||
* @returns {PDFPage}
|
||||
* @private
|
||||
*/
|
||||
_ensurePdfPageLoaded:
|
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function PDFThumbnailViewer_ensurePdfPageLoaded(thumbView) {
|
||||
if (thumbView.pdfPage) {
|
||||
return Promise.resolve(thumbView.pdfPage);
|
||||
}
|
||||
var pageNumber = thumbView.id;
|
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if (this._pagesRequests[pageNumber]) {
|
||||
return this._pagesRequests[pageNumber];
|
||||
}
|
||||
var promise = this.pdfDocument.getPage(pageNumber).then(
|
||||
function (pdfPage) {
|
||||
thumbView.setPdfPage(pdfPage);
|
||||
this._pagesRequests[pageNumber] = null;
|
||||
return pdfPage;
|
||||
}.bind(this));
|
||||
this._pagesRequests[pageNumber] = promise;
|
||||
return promise;
|
||||
},
|
||||
|
||||
ensureThumbnailVisible:
|
||||
function PDFThumbnailViewer_ensureThumbnailVisible(page) {
|
||||
// Ensure that the thumbnail of the current page is visible
|
||||
// when switching from another view.
|
||||
scrollIntoView(document.getElementById('thumbnailContainer' + page));
|
||||
},
|
||||
|
||||
forceRendering: function () {
|
||||
var visibleThumbs = this._getVisibleThumbs();
|
||||
var thumbView = this.renderingQueue.getHighestPriority(visibleThumbs,
|
||||
this.thumbnails,
|
||||
this.scroll.down);
|
||||
if (thumbView) {
|
||||
this._ensurePdfPageLoaded(thumbView).then(function () {
|
||||
this.renderingQueue.renderView(thumbView);
|
||||
}.bind(this));
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
};
|
||||
|
||||
return PDFThumbnailViewer;
|
||||
})();
|
||||
@ -1,410 +0,0 @@
|
||||
/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
||||
/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
|
||||
/* Copyright 2012 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.
|
||||
*/
|
||||
/* globals mozL10n, RenderingStates, Promise, scrollIntoView,
|
||||
watchScroll, getVisibleElements */
|
||||
|
||||
'use strict';
|
||||
|
||||
var THUMBNAIL_SCROLL_MARGIN = -19;
|
||||
var THUMBNAIL_CANVAS_BORDER_WIDTH = 1;
|
||||
|
||||
/**
|
||||
* @constructor
|
||||
* @param container
|
||||
* @param id
|
||||
* @param defaultViewport
|
||||
* @param linkService
|
||||
* @param renderingQueue
|
||||
*
|
||||
* @implements {IRenderableView}
|
||||
*/
|
||||
var ThumbnailView = function thumbnailView(container, id, defaultViewport,
|
||||
linkService, renderingQueue) {
|
||||
var anchor = document.createElement('a');
|
||||
anchor.href = linkService.getAnchorUrl('#page=' + id);
|
||||
anchor.title = mozL10n.get('thumb_page_title', {page: id}, 'Page {{page}}');
|
||||
anchor.onclick = function stopNavigation() {
|
||||
linkService.page = id;
|
||||
return false;
|
||||
};
|
||||
|
||||
this.pdfPage = undefined;
|
||||
this.viewport = defaultViewport;
|
||||
this.pdfPageRotate = defaultViewport.rotation;
|
||||
|
||||
this.rotation = 0;
|
||||
this.pageWidth = this.viewport.width;
|
||||
this.pageHeight = this.viewport.height;
|
||||
this.pageRatio = this.pageWidth / this.pageHeight;
|
||||
this.id = id;
|
||||
this.renderingId = 'thumbnail' + id;
|
||||
|
||||
this.canvasWidth = 98;
|
||||
this.canvasHeight = (this.canvasWidth / this.pageRatio) | 0;
|
||||
this.scale = this.canvasWidth / this.pageWidth;
|
||||
|
||||
var div = this.el = document.createElement('div');
|
||||
div.id = 'thumbnailContainer' + id;
|
||||
div.className = 'thumbnail';
|
||||
|
||||
if (id === 1) {
|
||||
// Highlight the thumbnail of the first page when no page number is
|
||||
// specified (or exists in cache) when the document is loaded.
|
||||
div.classList.add('selected');
|
||||
}
|
||||
|
||||
var ring = document.createElement('div');
|
||||
ring.className = 'thumbnailSelectionRing';
|
||||
ring.style.width = this.canvasWidth + 2 * THUMBNAIL_CANVAS_BORDER_WIDTH +
|
||||
'px';
|
||||
ring.style.height = this.canvasHeight + 2 * THUMBNAIL_CANVAS_BORDER_WIDTH +
|
||||
'px';
|
||||
|
||||
div.appendChild(ring);
|
||||
anchor.appendChild(div);
|
||||
container.appendChild(anchor);
|
||||
|
||||
this.hasImage = false;
|
||||
this.renderingState = RenderingStates.INITIAL;
|
||||
this.renderingQueue = renderingQueue;
|
||||
|
||||
this.setPdfPage = function thumbnailViewSetPdfPage(pdfPage) {
|
||||
this.pdfPage = pdfPage;
|
||||
this.pdfPageRotate = pdfPage.rotate;
|
||||
var totalRotation = (this.rotation + this.pdfPageRotate) % 360;
|
||||
this.viewport = pdfPage.getViewport(1, totalRotation);
|
||||
this.update();
|
||||
};
|
||||
|
||||
this.update = function thumbnailViewUpdate(rotation) {
|
||||
if (rotation !== undefined) {
|
||||
this.rotation = rotation;
|
||||
}
|
||||
var totalRotation = (this.rotation + this.pdfPageRotate) % 360;
|
||||
this.viewport = this.viewport.clone({
|
||||
scale: 1,
|
||||
rotation: totalRotation
|
||||
});
|
||||
this.pageWidth = this.viewport.width;
|
||||
this.pageHeight = this.viewport.height;
|
||||
this.pageRatio = this.pageWidth / this.pageHeight;
|
||||
|
||||
this.canvasHeight = (this.canvasWidth / this.pageRatio) | 0;
|
||||
this.scale = (this.canvasWidth / this.pageWidth);
|
||||
|
||||
div.removeAttribute('data-loaded');
|
||||
ring.textContent = '';
|
||||
ring.style.width = this.canvasWidth + 2 * THUMBNAIL_CANVAS_BORDER_WIDTH +
|
||||
'px';
|
||||
ring.style.height = this.canvasHeight + 2 * THUMBNAIL_CANVAS_BORDER_WIDTH +
|
||||
'px';
|
||||
|
||||
this.hasImage = false;
|
||||
this.renderingState = RenderingStates.INITIAL;
|
||||
this.resume = null;
|
||||
};
|
||||
|
||||
this.getPageDrawContext = function thumbnailViewGetPageDrawContext() {
|
||||
var canvas = document.createElement('canvas');
|
||||
canvas.id = 'thumbnail' + id;
|
||||
|
||||
canvas.width = this.canvasWidth;
|
||||
canvas.height = this.canvasHeight;
|
||||
canvas.className = 'thumbnailImage';
|
||||
canvas.setAttribute('aria-label', mozL10n.get('thumb_page_canvas',
|
||||
{page: id}, 'Thumbnail of Page {{page}}'));
|
||||
|
||||
div.setAttribute('data-loaded', true);
|
||||
|
||||
ring.appendChild(canvas);
|
||||
|
||||
return canvas.getContext('2d');
|
||||
};
|
||||
|
||||
this.drawingRequired = function thumbnailViewDrawingRequired() {
|
||||
return !this.hasImage;
|
||||
};
|
||||
|
||||
this.draw = function thumbnailViewDraw() {
|
||||
if (this.renderingState !== RenderingStates.INITIAL) {
|
||||
console.error('Must be in new state before drawing');
|
||||
}
|
||||
|
||||
this.renderingState = RenderingStates.RUNNING;
|
||||
if (this.hasImage) {
|
||||
return Promise.resolve(undefined);
|
||||
}
|
||||
|
||||
var resolveRenderPromise, rejectRenderPromise;
|
||||
var promise = new Promise(function (resolve, reject) {
|
||||
resolveRenderPromise = resolve;
|
||||
rejectRenderPromise = reject;
|
||||
});
|
||||
|
||||
var self = this;
|
||||
var ctx = this.getPageDrawContext();
|
||||
var drawViewport = this.viewport.clone({ scale: this.scale });
|
||||
var renderContext = {
|
||||
canvasContext: ctx,
|
||||
viewport: drawViewport,
|
||||
continueCallback: function(cont) {
|
||||
if (!self.renderingQueue.isHighestPriority(self)) {
|
||||
self.renderingState = RenderingStates.PAUSED;
|
||||
self.resume = function() {
|
||||
self.renderingState = RenderingStates.RUNNING;
|
||||
cont();
|
||||
};
|
||||
return;
|
||||
}
|
||||
cont();
|
||||
}
|
||||
};
|
||||
this.pdfPage.render(renderContext).promise.then(
|
||||
function pdfPageRenderCallback() {
|
||||
self.renderingState = RenderingStates.FINISHED;
|
||||
resolveRenderPromise(undefined);
|
||||
},
|
||||
function pdfPageRenderError(error) {
|
||||
self.renderingState = RenderingStates.FINISHED;
|
||||
rejectRenderPromise(error);
|
||||
}
|
||||
);
|
||||
this.hasImage = true;
|
||||
return promise;
|
||||
};
|
||||
|
||||
function getTempCanvas(width, height) {
|
||||
var tempCanvas = ThumbnailView.tempImageCache;
|
||||
if (!tempCanvas) {
|
||||
tempCanvas = document.createElement('canvas');
|
||||
ThumbnailView.tempImageCache = tempCanvas;
|
||||
}
|
||||
tempCanvas.width = width;
|
||||
tempCanvas.height = height;
|
||||
|
||||
// Since this is a temporary canvas, we need to fill
|
||||
// the canvas with a white background ourselves.
|
||||
// |getPageDrawContext| uses CSS rules for this.
|
||||
var ctx = tempCanvas.getContext('2d');
|
||||
ctx.save();
|
||||
ctx.fillStyle = 'rgb(255, 255, 255)';
|
||||
ctx.fillRect(0, 0, width, height);
|
||||
ctx.restore();
|
||||
return tempCanvas;
|
||||
}
|
||||
|
||||
this.setImage = function thumbnailViewSetImage(pageView) {
|
||||
var img = pageView.canvas;
|
||||
if (this.hasImage || !img) {
|
||||
return;
|
||||
}
|
||||
if (!this.pdfPage) {
|
||||
this.setPdfPage(pageView.pdfPage);
|
||||
}
|
||||
this.renderingState = RenderingStates.FINISHED;
|
||||
var ctx = this.getPageDrawContext();
|
||||
var canvas = ctx.canvas;
|
||||
|
||||
if (img.width <= 2 * canvas.width) {
|
||||
ctx.drawImage(img, 0, 0, img.width, img.height,
|
||||
0, 0, canvas.width, canvas.height);
|
||||
} else {
|
||||
// drawImage does an awful job of rescaling the image, doing it gradually
|
||||
var MAX_NUM_SCALING_STEPS = 3;
|
||||
var reducedWidth = canvas.width << MAX_NUM_SCALING_STEPS;
|
||||
var reducedHeight = canvas.height << MAX_NUM_SCALING_STEPS;
|
||||
var reducedImage = getTempCanvas(reducedWidth, reducedHeight);
|
||||
var reducedImageCtx = reducedImage.getContext('2d');
|
||||
|
||||
while (reducedWidth > img.width || reducedHeight > img.height) {
|
||||
reducedWidth >>= 1;
|
||||
reducedHeight >>= 1;
|
||||
}
|
||||
reducedImageCtx.drawImage(img, 0, 0, img.width, img.height,
|
||||
0, 0, reducedWidth, reducedHeight);
|
||||
while (reducedWidth > 2 * canvas.width) {
|
||||
reducedImageCtx.drawImage(reducedImage,
|
||||
0, 0, reducedWidth, reducedHeight,
|
||||
0, 0, reducedWidth >> 1, reducedHeight >> 1);
|
||||
reducedWidth >>= 1;
|
||||
reducedHeight >>= 1;
|
||||
}
|
||||
ctx.drawImage(reducedImage, 0, 0, reducedWidth, reducedHeight,
|
||||
0, 0, canvas.width, canvas.height);
|
||||
}
|
||||
|
||||
this.hasImage = true;
|
||||
};
|
||||
};
|
||||
|
||||
ThumbnailView.tempImageCache = null;
|
||||
|
||||
/**
|
||||
* @typedef {Object} PDFThumbnailViewerOptions
|
||||
* @property {HTMLDivElement} container - The container for the thumbs elements.
|
||||
* @property {IPDFLinkService} linkService - The navigation/linking service.
|
||||
* @property {PDFRenderingQueue} renderingQueue - The rendering queue object.
|
||||
*/
|
||||
|
||||
/**
|
||||
* Simple viewer control to display thumbs for pages.
|
||||
* @class
|
||||
*/
|
||||
var PDFThumbnailViewer = (function pdfThumbnailViewer() {
|
||||
/**
|
||||
* @constructs
|
||||
* @param {PDFThumbnailViewerOptions} options
|
||||
*/
|
||||
function PDFThumbnailViewer(options) {
|
||||
this.container = options.container;
|
||||
this.renderingQueue = options.renderingQueue;
|
||||
this.linkService = options.linkService;
|
||||
|
||||
this.scroll = watchScroll(this.container, this._scrollUpdated.bind(this));
|
||||
this._resetView();
|
||||
}
|
||||
|
||||
PDFThumbnailViewer.prototype = {
|
||||
_scrollUpdated: function PDFThumbnailViewer_scrollUpdated() {
|
||||
this.renderingQueue.renderHighestPriority();
|
||||
},
|
||||
|
||||
getThumbnail: function PDFThumbnailViewer_getThumbnail(index) {
|
||||
return this.thumbnails[index];
|
||||
},
|
||||
|
||||
_getVisibleThumbs: function PDFThumbnailViewer_getVisibleThumbs() {
|
||||
return getVisibleElements(this.container, this.thumbnails);
|
||||
},
|
||||
|
||||
scrollThumbnailIntoView: function (page) {
|
||||
var selected = document.querySelector('.thumbnail.selected');
|
||||
if (selected) {
|
||||
selected.classList.remove('selected');
|
||||
}
|
||||
var thumbnail = document.getElementById('thumbnailContainer' + page);
|
||||
thumbnail.classList.add('selected');
|
||||
var visibleThumbs = this._getVisibleThumbs();
|
||||
var numVisibleThumbs = visibleThumbs.views.length;
|
||||
|
||||
// If the thumbnail isn't currently visible, scroll it into view.
|
||||
if (numVisibleThumbs > 0) {
|
||||
var first = visibleThumbs.first.id;
|
||||
// Account for only one thumbnail being visible.
|
||||
var last = (numVisibleThumbs > 1 ? visibleThumbs.last.id : first);
|
||||
if (page <= first || page >= last) {
|
||||
scrollIntoView(thumbnail, { top: THUMBNAIL_SCROLL_MARGIN });
|
||||
}
|
||||
}
|
||||
},
|
||||
|
||||
get pagesRotation() {
|
||||
return this._pagesRotation;
|
||||
},
|
||||
|
||||
set pagesRotation(rotation) {
|
||||
this._pagesRotation = rotation;
|
||||
for (var i = 0, l = this.thumbnails.length; i < l; i++) {
|
||||
var thumb = this.thumbnails[i];
|
||||
thumb.update(rotation);
|
||||
}
|
||||
},
|
||||
|
||||
cleanup: function PDFThumbnailViewer_cleanup() {
|
||||
ThumbnailView.tempImageCache = null;
|
||||
},
|
||||
|
||||
_resetView: function () {
|
||||
this.thumbnails = [];
|
||||
this._pagesRotation = 0;
|
||||
this._pagesRequests = [];
|
||||
},
|
||||
|
||||
setDocument: function (pdfDocument) {
|
||||
if (this.pdfDocument) {
|
||||
// cleanup of the elements and views
|
||||
var thumbsView = this.container;
|
||||
while (thumbsView.hasChildNodes()) {
|
||||
thumbsView.removeChild(thumbsView.lastChild);
|
||||
}
|
||||
this._resetView();
|
||||
}
|
||||
|
||||
this.pdfDocument = pdfDocument;
|
||||
if (!pdfDocument) {
|
||||
return Promise.resolve();
|
||||
}
|
||||
|
||||
return pdfDocument.getPage(1).then(function (firstPage) {
|
||||
var pagesCount = pdfDocument.numPages;
|
||||
var viewport = firstPage.getViewport(1.0);
|
||||
for (var pageNum = 1; pageNum <= pagesCount; ++pageNum) {
|
||||
var thumbnail = new ThumbnailView(this.container, pageNum,
|
||||
viewport.clone(), this.linkService,
|
||||
this.renderingQueue);
|
||||
this.thumbnails.push(thumbnail);
|
||||
}
|
||||
}.bind(this));
|
||||
},
|
||||
|
||||
/**
|
||||
* @param {PDFPageView} pageView
|
||||
* @returns {PDFPage}
|
||||
* @private
|
||||
*/
|
||||
_ensurePdfPageLoaded: function (thumbView) {
|
||||
if (thumbView.pdfPage) {
|
||||
return Promise.resolve(thumbView.pdfPage);
|
||||
}
|
||||
var pageNumber = thumbView.id;
|
||||
if (this._pagesRequests[pageNumber]) {
|
||||
return this._pagesRequests[pageNumber];
|
||||
}
|
||||
var promise = this.pdfDocument.getPage(pageNumber).then(
|
||||
function (pdfPage) {
|
||||
thumbView.setPdfPage(pdfPage);
|
||||
this._pagesRequests[pageNumber] = null;
|
||||
return pdfPage;
|
||||
}.bind(this));
|
||||
this._pagesRequests[pageNumber] = promise;
|
||||
return promise;
|
||||
},
|
||||
|
||||
ensureThumbnailVisible:
|
||||
function PDFThumbnailViewer_ensureThumbnailVisible(page) {
|
||||
// Ensure that the thumbnail of the current page is visible
|
||||
// when switching from another view.
|
||||
scrollIntoView(document.getElementById('thumbnailContainer' + page));
|
||||
},
|
||||
|
||||
forceRendering: function () {
|
||||
var visibleThumbs = this._getVisibleThumbs();
|
||||
var thumbView = this.renderingQueue.getHighestPriority(visibleThumbs,
|
||||
this.thumbnails,
|
||||
this.scroll.down);
|
||||
if (thumbView) {
|
||||
this._ensurePdfPageLoaded(thumbView).then(function () {
|
||||
this.renderingQueue.renderView(thumbView);
|
||||
}.bind(this));
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
};
|
||||
|
||||
return PDFThumbnailViewer;
|
||||
})();
|
||||
@ -73,7 +73,8 @@ http://sourceforge.net/adobe/cmap/wiki/License/
|
||||
<script src="text_layer_builder.js"></script>
|
||||
<script src="annotations_layer_builder.js"></script>
|
||||
<script src="pdf_viewer.js"></script>
|
||||
<script src="thumbnail_view.js"></script>
|
||||
<script src="pdf_thumbnail_view.js"></script>
|
||||
<script src="pdf_thumbnail_viewer.js"></script>
|
||||
<script src="document_outline_view.js"></script>
|
||||
<script src="document_attachments_view.js"></script>
|
||||
<script src="pdf_find_bar.js"></script>
|
||||
|
||||
@ -85,6 +85,7 @@ var mozL10n = document.mozL10n || document.webL10n;
|
||||
//#include password_prompt.js
|
||||
//#include document_properties.js
|
||||
//#include pdf_viewer.js
|
||||
//#include pdf_thumbnail_viewer.js
|
||||
|
||||
var PDFViewerApplication = {
|
||||
initialBookmark: document.location.hash.substring(1),
|
||||
@ -1389,7 +1390,6 @@ var PDFViewerApplication = {
|
||||
window.PDFView = PDFViewerApplication; // obsolete name, using it as an alias
|
||||
//#endif
|
||||
|
||||
//#include thumbnail_view.js
|
||||
//#include document_outline_view.js
|
||||
//#include document_attachments_view.js
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user