52 lines
1.6 KiB
JavaScript
52 lines
1.6 KiB
JavaScript
// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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'use strict';
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/**
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* Global PDFViewer object, accessible for testing.
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* @type Object
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*/
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var viewer;
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(function() {
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/**
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* Stores any pending messages received which should be passed to the
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* PDFViewer when it is created.
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* @type Array
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*/
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var pendingMessages = [];
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/**
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* Handles events that are received prior to the PDFViewer being created.
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* @param {Object} message A message event received.
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*/
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function handleScriptingMessage(message) {
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pendingMessages.push(message);
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}
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/**
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* Initialize the global PDFViewer and pass any outstanding messages to it.
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* @param {Object} browserApi An object providing an API to the browser.
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*/
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function initViewer(browserApi) {
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// PDFViewer will handle any messages after it is created.
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window.removeEventListener('message', handleScriptingMessage, false);
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viewer = new PDFViewer(browserApi);
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while (pendingMessages.length > 0)
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viewer.handleScriptingMessage(pendingMessages.shift());
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}
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/**
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* Entrypoint for starting the PDF viewer. This function obtains the browser
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* API for the PDF and constructs a PDFViewer object with it.
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*/
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cr.sendWithPromise('initialize').then(function(opts) {
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// Set up an event listener to catch scripting messages which are sent prior
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// to the PDFViewer being created.
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window.addEventListener('message', handleScriptingMessage, false);
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createBrowserApi(opts).then(initViewer);
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});
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})()
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