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/* -*- 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, PDFPageSource,
watchScroll, getVisibleElements */
'use strict';
var THUMBNAIL_SCROLL_MARGIN = -19;
/**
* @constructor
* @param container
* @param id
* @param defaultViewport
* @param linkService
* @param renderingQueue
* @param pageSource
*
* @implements {IRenderableView}
*/
var ThumbnailView = function thumbnailView(container, id, defaultViewport,
linkService, renderingQueue,
pageSource) {
var anchor = document.createElement('a');
anchor.href = linkService.getAnchorUrl('#page=' + id);
anchor.title = mozL10n.get('thumb_page_title', {page: id}, 'Page {{page}}');
anchor. 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.pageWidth * this.pageHeight;
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 + 'px';
ring.style.height = this.canvasHeight + 'px';
div.appendChild(ring);
anchor.appendChild(div);
container.appendChild(anchor);
this.hasImage = false;
this.renderingState = RenderingStates.INITIAL;
this.renderingQueue = renderingQueue;
this.pageSource = pageSource;
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.pageWidth * this.pageHeight;
this.scale = (this.canvasWidth / this.pageWidth);
div.removeAttribute('data-loaded');
ring.textContent = '';
ring.style.width = this.canvasWidth + 'px';
ring.style.height = this.canvasHeight + '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);
var ctx = canvas.getContext('2d');
ctx.save();
ctx.fillStyle = 'rgb(255, 255, 255)';
ctx.fillRect(0, 0, this.canvasWidth, this.canvasHeight);
ctx.restore();
return ctx;
};
this.drawingRequired = function thumbnailViewDrawingRequired() {
return !this.hasImage;
};
this.draw = function thumbnailViewDraw(callback) {
if (!this.pdfPage) {
var promise = this.pageSource.getPage(this.id);
promise.then(function(pdfPage) {
this.setPdfPage(pdfPage);
this.draw(callback);
}.bind(this));
return;
}
if (this.renderingState !== RenderingStates.INITIAL) {
console.error('Must be in new state before drawing');
}
this.renderingState = RenderingStates.RUNNING;
if (this.hasImage) {
callback();
return;
}
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;
callback();
},
function pdfPageRenderError(error) {
self.renderingState = RenderingStates.FINISHED;
callback();
}
);
this.hasImage = true;
};
function getTempCanvas(width, height) {
var tempCanvas = ThumbnailView.tempImageCache;
if (!tempCanvas) {
tempCanvas = document.createElement('canvas');
ThumbnailView.tempImageCache = tempCanvas;
}
tempCanvas.width = width;
tempCanvas.height = height;
return tempCanvas;
}
this.setImage = function thumbnailViewSetImage(img) {
if (!this.pdfPage) {
var promise = this.pageSource.getPage();
promise.then(function(pdfPage) {
this.setPdfPage(pdfPage);
this.setImage(img);
}.bind(this));
return;
}
if (this.hasImage || !img) {
return;
}
this.renderingState = RenderingStates.FINISHED;
var ctx = this.getPageDrawContext();
var reducedImage = img;
var reducedWidth = img.width;
var reducedHeight = img.height;
// drawImage does an awful job of rescaling the image, doing it gradually
var MAX_SCALE_FACTOR = 2.0;
if (Math.max(img.width / ctx.canvas.width,
img.height / ctx.canvas.height) > MAX_SCALE_FACTOR) {
reducedWidth >>= 1;
reducedHeight >>= 1;
reducedImage = getTempCanvas(reducedWidth, reducedHeight);
var reducedImageCtx = reducedImage.getContext('2d');
reducedImageCtx.drawImage(img, 0, 0, img.width, img.height,
0, 0, reducedWidth, reducedHeight);
while (Math.max(reducedWidth / ctx.canvas.width,
reducedHeight / ctx.canvas.height) > MAX_SCALE_FACTOR) {
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, ctx.canvas.width, ctx.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;
},
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 pageSource = new PDFPageSource(pdfDocument, pageNum);
var thumbnail = new ThumbnailView(this.container, pageNum,
viewport.clone(), this.linkService,
this.renderingQueue, pageSource);
this.thumbnails.push(thumbnail);
}
}.bind(this));
},
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.renderingQueue.renderView(thumbView);
return true;
}
return false;
}
};
return PDFThumbnailViewer;
})();