Yury Delendik
11 years ago
6 changed files with 178 additions and 110 deletions
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@@ -0,0 +1,151 @@
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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 CLEANUP_TIMEOUT */ |
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'use strict'; |
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var RenderingStates = { |
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INITIAL: 0, |
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RUNNING: 1, |
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PAUSED: 2, |
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FINISHED: 3 |
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}; |
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var PDFRenderingQueue = (function PDFRenderingQueueClosure() { |
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function PDFRenderingQueue() { |
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this.pdfViewer = null; |
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this.pdfThumbnailViewer = null; |
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this.onIdle = null; |
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this.highestPriorityPage = null; |
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this.idleTimeout = null; |
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this.printing = false; |
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this.isThumbnailViewEnabled = false; |
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} |
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PDFRenderingQueue.prototype = { |
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setViewer: function PDFRenderingQueue_setViewer(pdfViewer) { |
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this.pdfViewer = pdfViewer; |
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}, |
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setThumbnailViewer: |
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function PDFRenderingQueue_setThumbnailViewer(pdfThumbnailViewer) { |
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this.pdfThumbnailViewer = pdfThumbnailViewer; |
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}, |
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isHighestPriority: function PDFRenderingQueue_isHighestPriority(view) { |
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return this.highestPriorityPage === view.renderingId; |
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}, |
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renderHighestPriority: function |
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PDFRenderingQueue_renderHighestPriority(currentlyVisiblePages) { |
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if (this.idleTimeout) { |
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clearTimeout(this.idleTimeout); |
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this.idleTimeout = null; |
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} |
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// Pages have a higher priority than thumbnails, so check them first.
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if (this.pdfViewer.forceRendering(currentlyVisiblePages)) { |
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return; |
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} |
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// No pages needed rendering so check thumbnails.
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if (this.pdfThumbnailViewer && this.isThumbnailViewEnabled) { |
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if (this.pdfThumbnailViewer.forceRendering()) { |
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return; |
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} |
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} |
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if (this.printing) { |
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// If printing is currently ongoing do not reschedule cleanup.
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return; |
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} |
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if (this.onIdle) { |
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this.idleTimeout = setTimeout(this.onIdle.bind(this), CLEANUP_TIMEOUT); |
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} |
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}, |
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getHighestPriority: function |
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PDFRenderingQueue_getHighestPriority(visible, views, scrolledDown) { |
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// The state has changed figure out which page has the highest priority to
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// render next (if any).
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// Priority:
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// 1 visible pages
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// 2 if last scrolled down page after the visible pages
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// 2 if last scrolled up page before the visible pages
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var visibleViews = visible.views; |
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var numVisible = visibleViews.length; |
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if (numVisible === 0) { |
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return false; |
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} |
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for (var i = 0; i < numVisible; ++i) { |
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var view = visibleViews[i].view; |
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if (!this.isViewFinished(view)) { |
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return view; |
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} |
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} |
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// All the visible views have rendered, try to render next/previous pages.
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if (scrolledDown) { |
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var nextPageIndex = visible.last.id; |
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// ID's start at 1 so no need to add 1.
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if (views[nextPageIndex] && |
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!this.isViewFinished(views[nextPageIndex])) { |
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return views[nextPageIndex]; |
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} |
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} else { |
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var previousPageIndex = visible.first.id - 2; |
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if (views[previousPageIndex] && |
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!this.isViewFinished(views[previousPageIndex])) { |
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return views[previousPageIndex]; |
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} |
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} |
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// Everything that needs to be rendered has been.
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return null; |
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}, |
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isViewFinished: function PDFRenderingQueue_isViewFinished(view) { |
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return view.renderingState === RenderingStates.FINISHED; |
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}, |
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// Render a page or thumbnail view. This calls the appropriate function
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// based on the views state. If the view is already rendered it will return
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// false.
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renderView: function PDFRenderingQueue_renderView(view) { |
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var state = view.renderingState; |
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switch (state) { |
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case RenderingStates.FINISHED: |
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return false; |
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case RenderingStates.PAUSED: |
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this.highestPriorityPage = view.renderingId; |
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view.resume(); |
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break; |
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case RenderingStates.RUNNING: |
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this.highestPriorityPage = view.renderingId; |
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break; |
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case RenderingStates.INITIAL: |
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this.highestPriorityPage = view.renderingId; |
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view.draw(this.renderHighestPriority.bind(this)); |
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break; |
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} |
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return true; |
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}, |
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}; |
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return PDFRenderingQueue; |
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})(); |
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