385 lines
12 KiB
JavaScript
385 lines
12 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 mozL10n, RenderingStates, Promise, scrollIntoView, PDFPageSource,
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watchScroll, getVisibleElements */
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'use strict';
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var THUMBNAIL_SCROLL_MARGIN = -19;
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/**
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* @constructor
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* @param container
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* @param id
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* @param defaultViewport
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* @param linkService
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* @param renderingQueue
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* @param pageSource
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*
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* @implements {IRenderableView}
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*/
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var ThumbnailView = function thumbnailView(container, id, defaultViewport,
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linkService, renderingQueue,
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pageSource) {
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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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this.pdfPage = undefined;
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this.viewport = defaultViewport;
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this.pdfPageRotate = defaultViewport.rotation;
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this.rotation = 0;
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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.id = id;
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this.renderingId = 'thumbnail' + id;
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this.canvasWidth = 98;
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this.canvasHeight = this.canvasWidth / this.pageWidth * this.pageHeight;
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this.scale = (this.canvasWidth / this.pageWidth);
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var div = this.el = document.createElement('div');
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div.id = 'thumbnailContainer' + id;
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div.className = 'thumbnail';
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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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ring.style.width = this.canvasWidth + 'px';
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ring.style.height = this.canvasHeight + 'px';
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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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this.hasImage = false;
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this.renderingState = RenderingStates.INITIAL;
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this.renderingQueue = renderingQueue;
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this.pageSource = pageSource;
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this.setPdfPage = function thumbnailViewSetPdfPage(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.update();
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};
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this.update = function thumbnailViewUpdate(rotation) {
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if (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.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.pageWidth * this.pageHeight;
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this.scale = (this.canvasWidth / this.pageWidth);
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div.removeAttribute('data-loaded');
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ring.textContent = '';
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ring.style.width = this.canvasWidth + 'px';
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ring.style.height = this.canvasHeight + 'px';
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this.hasImage = false;
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this.renderingState = RenderingStates.INITIAL;
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this.resume = null;
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};
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this.getPageDrawContext = function thumbnailViewGetPageDrawContext() {
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var canvas = document.createElement('canvas');
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canvas.id = 'thumbnail' + id;
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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: id}, 'Thumbnail of Page {{page}}'));
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div.setAttribute('data-loaded', true);
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ring.appendChild(canvas);
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var ctx = canvas.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, this.canvasWidth, this.canvasHeight);
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ctx.restore();
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return ctx;
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};
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this.drawingRequired = function thumbnailViewDrawingRequired() {
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return !this.hasImage;
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};
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this.draw = function thumbnailViewDraw(callback) {
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if (!this.pdfPage) {
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var promise = this.pageSource.getPage(this.id);
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promise.then(function(pdfPage) {
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this.setPdfPage(pdfPage);
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this.draw(callback);
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}.bind(this));
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return;
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}
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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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if (this.hasImage) {
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callback();
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return;
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}
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var self = this;
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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 renderContext = {
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canvasContext: ctx,
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viewport: drawViewport,
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continueCallback: function(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() {
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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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this.pdfPage.render(renderContext).promise.then(
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function pdfPageRenderCallback() {
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self.renderingState = RenderingStates.FINISHED;
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callback();
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},
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function pdfPageRenderError(error) {
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self.renderingState = RenderingStates.FINISHED;
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callback();
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}
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);
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this.hasImage = true;
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};
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function getTempCanvas(width, height) {
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var tempCanvas = ThumbnailView.tempImageCache;
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if (!tempCanvas) {
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tempCanvas = document.createElement('canvas');
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ThumbnailView.tempImageCache = tempCanvas;
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}
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tempCanvas.width = width;
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tempCanvas.height = height;
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return tempCanvas;
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}
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this.setImage = function thumbnailViewSetImage(img) {
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if (!this.pdfPage) {
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var promise = this.pageSource.getPage();
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promise.then(function(pdfPage) {
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this.setPdfPage(pdfPage);
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this.setImage(img);
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}.bind(this));
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return;
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}
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if (this.hasImage || !img) {
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return;
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}
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this.renderingState = RenderingStates.FINISHED;
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var ctx = this.getPageDrawContext();
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var reducedImage = img;
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var reducedWidth = img.width;
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var reducedHeight = img.height;
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// drawImage does an awful job of rescaling the image, doing it gradually
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var MAX_SCALE_FACTOR = 2.0;
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if (Math.max(img.width / ctx.canvas.width,
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img.height / ctx.canvas.height) > MAX_SCALE_FACTOR) {
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reducedWidth >>= 1;
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reducedHeight >>= 1;
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reducedImage = getTempCanvas(reducedWidth, reducedHeight);
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var reducedImageCtx = reducedImage.getContext('2d');
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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 (Math.max(reducedWidth / ctx.canvas.width,
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reducedHeight / ctx.canvas.height) > MAX_SCALE_FACTOR) {
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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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}
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ctx.drawImage(reducedImage, 0, 0, reducedWidth, reducedHeight,
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0, 0, ctx.canvas.width, ctx.canvas.height);
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this.hasImage = true;
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};
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};
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ThumbnailView.tempImageCache = null;
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/**
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* @typedef {Object} PDFThumbnailViewerOptions
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* @property {HTMLDivElement} container - The container for the thumbs 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 thumbs for pages.
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* @class
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*/
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var PDFThumbnailViewer = (function pdfThumbnailViewer() {
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/**
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* @constructs
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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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_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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_getVisibleThumbs: function PDFThumbnailViewer_getVisibleThumbs() {
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return getVisibleElements(this.container, this.thumbnails);
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},
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scrollThumbnailIntoView: function (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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ThumbnailView.tempImageCache = null;
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},
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_resetView: function () {
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this.thumbnails = [];
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this._pagesRotation = 0;
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},
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setDocument: function (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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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 pageSource = new PDFPageSource(pdfDocument, pageNum);
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var thumbnail = new ThumbnailView(this.container, pageNum,
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viewport.clone(), this.linkService,
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this.renderingQueue, pageSource);
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this.thumbnails.push(thumbnail);
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}
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}.bind(this));
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},
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ensureThumbnailVisible:
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function PDFThumbnailViewer_ensureThumbnailVisible(page) {
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// Ensure that the thumbnail of the current page is visible
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// when switching from another view.
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scrollIntoView(document.getElementById('thumbnailContainer' + page));
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},
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forceRendering: function () {
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var visibleThumbs = this._getVisibleThumbs();
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var thumbView = this.renderingQueue.getHighestPriority(visibleThumbs,
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this.thumbnails,
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this.scroll.down);
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if (thumbView) {
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this.renderingQueue.renderView(thumbView);
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return true;
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}
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return false;
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}
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};
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return PDFThumbnailViewer;
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})();
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