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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
'use strict';
/**
* Global PDFViewer object, accessible for testing.
* @type Object
*/
var viewer;
(function() {
/**
* Stores any pending messages received which should be passed to the
* PDFViewer when it is created.
* @type Array
*/
var pendingMessages = [];
/**
* Handles events that are received prior to the PDFViewer being created.
* @param {Object} message A message event received.
*/
function handleScriptingMessage(message) {
pendingMessages.push(message);
}
/**
* Initialize the global PDFViewer and pass any outstanding messages to it.
* @param {Object} streamDetails The stream object which points to the data
* contained in the PDF.
*/
function initViewer(streamDetails) {
// PDFViewer will handle any messages after it is created.
window.removeEventListener('message', handleScriptingMessage, false);
viewer = new PDFViewer(streamDetails);
while (pendingMessages.length > 0)
viewer.handleScriptingMessage(pendingMessages.shift());
}
function generateStreamDetailsAndInitViewer() {
var url = window.location.search.substring(1);
var streamDetails = {
streamUrl: url,
originalUrl: url,
responseHeaders: '',
embedded: window.parent != window,
tabId: -1
};
if (!chrome.tabs) {
initViewer(streamDetails);
return;
}
chrome.tabs.getCurrent(function(tab) {
streamDetails.tabId = tab.id;
initViewer(streamDetails);
});
}
/**
* Entrypoint for starting the PDF viewer. This function obtains the details
* of the PDF 'stream' (the data that points to the PDF) and constructs a
* PDFViewer object with it.
*/
function main() {
// Set up an event listener to catch scripting messages which are sent prior
// to the PDFViewer being created.
window.addEventListener('message', handleScriptingMessage, false);
if (window.location.search) {
generateStreamDetailsAndInitViewer();
return;
}
// If the viewer is started from the browser plugin, getStreamInfo will
// return the details of the stream.
chrome.mimeHandlerPrivate.getStreamInfo(function(streamDetails) {
initViewer(streamDetails);
});
};
main();
})();
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