/**
|
* @licstart The following is the entire license notice for the
|
* JavaScript code in this page
|
*
|
* Copyright 2022 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.
|
*
|
* @licend The above is the entire license notice for the
|
* JavaScript code in this page
|
*/
|
"use strict";
|
|
Object.defineProperty(exports, "__esModule", {
|
value: true
|
});
|
exports.PDFRenderingQueue = void 0;
|
|
var _pdf = require("../pdf");
|
|
var _ui_utils = require("./ui_utils.js");
|
|
const CLEANUP_TIMEOUT = 30000;
|
|
class PDFRenderingQueue {
|
constructor() {
|
this.pdfViewer = null;
|
this.pdfThumbnailViewer = null;
|
this.onIdle = null;
|
this.highestPriorityPage = null;
|
this.idleTimeout = null;
|
this.printing = false;
|
this.isThumbnailViewEnabled = false;
|
}
|
|
setViewer(pdfViewer) {
|
this.pdfViewer = pdfViewer;
|
}
|
|
setThumbnailViewer(pdfThumbnailViewer) {
|
this.pdfThumbnailViewer = pdfThumbnailViewer;
|
}
|
|
isHighestPriority(view) {
|
return this.highestPriorityPage === view.renderingId;
|
}
|
|
hasViewer() {
|
return !!this.pdfViewer;
|
}
|
|
renderHighestPriority(currentlyVisiblePages) {
|
if (this.idleTimeout) {
|
clearTimeout(this.idleTimeout);
|
this.idleTimeout = null;
|
}
|
|
if (this.pdfViewer.forceRendering(currentlyVisiblePages)) {
|
return;
|
}
|
|
if (this.isThumbnailViewEnabled && this.pdfThumbnailViewer?.forceRendering()) {
|
return;
|
}
|
|
if (this.printing) {
|
return;
|
}
|
|
if (this.onIdle) {
|
this.idleTimeout = setTimeout(this.onIdle.bind(this), CLEANUP_TIMEOUT);
|
}
|
}
|
|
getHighestPriority(visible, views, scrolledDown, preRenderExtra = false) {
|
const visibleViews = visible.views,
|
numVisible = visibleViews.length;
|
|
if (numVisible === 0) {
|
return null;
|
}
|
|
for (let i = 0; i < numVisible; i++) {
|
const view = visibleViews[i].view;
|
|
if (!this.isViewFinished(view)) {
|
return view;
|
}
|
}
|
|
const firstId = visible.first.id,
|
lastId = visible.last.id;
|
|
if (lastId - firstId + 1 > numVisible) {
|
const visibleIds = visible.ids;
|
|
for (let i = 1, ii = lastId - firstId; i < ii; i++) {
|
const holeId = scrolledDown ? firstId + i : lastId - i;
|
|
if (visibleIds.has(holeId)) {
|
continue;
|
}
|
|
const holeView = views[holeId - 1];
|
|
if (!this.isViewFinished(holeView)) {
|
return holeView;
|
}
|
}
|
}
|
|
let preRenderIndex = scrolledDown ? lastId : firstId - 2;
|
let preRenderView = views[preRenderIndex];
|
|
if (preRenderView && !this.isViewFinished(preRenderView)) {
|
return preRenderView;
|
}
|
|
if (preRenderExtra) {
|
preRenderIndex += scrolledDown ? 1 : -1;
|
preRenderView = views[preRenderIndex];
|
|
if (preRenderView && !this.isViewFinished(preRenderView)) {
|
return preRenderView;
|
}
|
}
|
|
return null;
|
}
|
|
isViewFinished(view) {
|
return view.renderingState === _ui_utils.RenderingStates.FINISHED;
|
}
|
|
renderView(view) {
|
switch (view.renderingState) {
|
case _ui_utils.RenderingStates.FINISHED:
|
return false;
|
|
case _ui_utils.RenderingStates.PAUSED:
|
this.highestPriorityPage = view.renderingId;
|
view.resume();
|
break;
|
|
case _ui_utils.RenderingStates.RUNNING:
|
this.highestPriorityPage = view.renderingId;
|
break;
|
|
case _ui_utils.RenderingStates.INITIAL:
|
this.highestPriorityPage = view.renderingId;
|
view.draw().finally(() => {
|
this.renderHighestPriority();
|
}).catch(reason => {
|
if (reason instanceof _pdf.RenderingCancelledException) {
|
return;
|
}
|
|
console.error(`renderView: "${reason}"`);
|
});
|
break;
|
}
|
|
return true;
|
}
|
|
}
|
|
exports.PDFRenderingQueue = PDFRenderingQueue;
|
