Rename ThumbnailView to PDFThumbnailView and refactor it to be more class-like
This commit is contained in:
Jonas Jenwald
parent
64ba38008f
commit
7f8f404536
@ -21,175 +21,24 @@
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var THUMBNAIL_CANVAS_BORDER_WIDTH = 1;
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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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*
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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 ThumbnailView = function thumbnailView(container, id, defaultViewport,
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linkService, renderingQueue) {
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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.pageRatio) | 0;
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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 + 2 * THUMBNAIL_CANVAS_BORDER_WIDTH +
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'px';
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ring.style.height = this.canvasHeight + 2 * THUMBNAIL_CANVAS_BORDER_WIDTH +
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'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.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.pageRatio) | 0;
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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 + 2 * THUMBNAIL_CANVAS_BORDER_WIDTH +
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'px';
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ring.style.height = this.canvasHeight + 2 * THUMBNAIL_CANVAS_BORDER_WIDTH +
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'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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return canvas.getContext('2d');
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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() {
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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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return Promise.resolve(undefined);
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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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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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resolveRenderPromise(undefined);
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},
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function pdfPageRenderError(error) {
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self.renderingState = RenderingStates.FINISHED;
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rejectRenderPromise(error);
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}
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);
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this.hasImage = true;
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return promise;
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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 = ThumbnailView.tempImageCache;
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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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ThumbnailView.tempImageCache = tempCanvas;
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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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@ -205,48 +54,221 @@ var ThumbnailView = function thumbnailView(container, id, defaultViewport,
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return tempCanvas;
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}
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this.setImage = function thumbnailViewSetImage(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.renderingState = RenderingStates.FINISHED;
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var ctx = this.getPageDrawContext();
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var canvas = ctx.canvas;
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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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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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} else {
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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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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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while (reducedWidth > img.width || reducedHeight > img.height) {
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reducedWidth >>= 1;
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reducedHeight >>= 1;
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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.pageRatio) | 0;
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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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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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ring.style.width =
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this.canvasWidth + 2 * THUMBNAIL_CANVAS_BORDER_WIDTH + 'px';
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ring.style.height =
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this.canvasHeight + 2 * THUMBNAIL_CANVAS_BORDER_WIDTH + '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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this.hasImage = false;
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this.renderingState = RenderingStates.INITIAL;
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this.renderingQueue = renderingQueue;
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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.update();
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},
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update: function PDFThumbnailView_update(rotation) {
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if (rotation !== undefined) {
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this.rotation = rotation;
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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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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.hasImage = true;
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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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this.ring.textContent = '';
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this.ring.style.width =
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this.canvasWidth + 2 * THUMBNAIL_CANVAS_BORDER_WIDTH + 'px';
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this.ring.style.height =
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this.canvasHeight + 2 * THUMBNAIL_CANVAS_BORDER_WIDTH + '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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getPageDrawContext: function PDFThumbnailView_getPageDrawContext() {
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var canvas = document.createElement('canvas');
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canvas.id = 'thumbnail' + this.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: this.id}, 'Thumbnail of Page {{page}}'));
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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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drawingRequired: function PDFThumbnailView_drawingRequired() {
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return !this.hasImage;
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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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this.renderingState = RenderingStates.RUNNING;
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if (this.hasImage) {
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return Promise.resolve(undefined);
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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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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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resolveRenderPromise(undefined);
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},
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function pdfPageRenderError(error) {
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self.renderingState = RenderingStates.FINISHED;
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rejectRenderPromise(error);
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}
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);
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this.hasImage = true;
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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.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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} else {
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// drawImage does an awful job of rescaling the image,
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// 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,
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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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this.hasImage = true;
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}
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};
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};
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ThumbnailView.tempImageCache = null;
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return PDFThumbnailView;
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})();
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PDFThumbnailView.tempImageCache = null;
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@ -14,7 +14,7 @@
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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, ThumbnailView,
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/* globals watchScroll, getVisibleElements, scrollIntoView, PDFThumbnailView,
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Promise */
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'use strict';
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@ -104,7 +104,7 @@ var PDFThumbnailViewer = (function PDFThumbnailViewerClosure() {
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},
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cleanup: function PDFThumbnailViewer_cleanup() {
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ThumbnailView.tempImageCache = null;
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PDFThumbnailView.tempImageCache = null;
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},
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/**
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@ -135,9 +135,13 @@ var PDFThumbnailViewer = (function PDFThumbnailViewerClosure() {
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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 ThumbnailView(this.container, pageNum,
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viewport.clone(), this.linkService,
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this.renderingQueue);
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var thumbnail = new PDFThumbnailView({
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container: this.container,
|
||||
id: pageNum,
|
||||
defaultViewport: viewport.clone(),
|
||||
linkService: this.linkService,
|
||||
renderingQueue: this.renderingQueue
|
||||
});
|
||||
this.thumbnails.push(thumbnail);
|
||||
}
|
||||
}.bind(this));
|
||||
|
||||
Loading…
Reference in New Issue
Block a user