1 // Copyright (c) 2010 The Chromium OS Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 request = {action: 'should_scroll'} 6 7 var PLAY_MUSIC_HOSTNAME = 'play.google.com'; 8 9 function report_scrolling_to_test() { 10 //Sends message to PLT informing that user is scrolling on the browser. 11 var scroll_url = 'http://localhost:8001/scroll'; 12 var req = new XMLHttpRequest(); 13 req.open('GET', scroll_url, true); 14 req.send(""); 15 } 16 17 //Sends message to the test.js(background script). test.js on 18 //receiving a message from content script assumes the page has 19 //loaded successfully. It further responds with instructions on 20 //whether/how to scroll. 21 function sendSuccessToBGScript() { 22 chrome.runtime.sendMessage(request, function(response) { 23 if (response && response.should_scroll) { 24 window.focus(); 25 lastOffset = window.pageYOffset; 26 var start_interval = Math.max(1000, response.scroll_interval); 27 function smoothScrollDown() { 28 report_scrolling_to_test(); 29 window.scrollBy(0, response.scroll_by); 30 if (window.pageYOffset != lastOffset) { 31 lastOffset = window.pageYOffset; 32 setTimeout(smoothScrollDown, response.scroll_interval); 33 } else if (response.should_scroll_up) { 34 setTimeout(smoothScrollUp, start_interval); 35 } 36 } 37 function smoothScrollUp() { 38 report_scrolling_to_test(); 39 window.scrollBy(0, -1 * response.scroll_by); 40 if (window.pageYOffset != lastOffset) { 41 lastOffset = window.pageYOffset; 42 setTimeout(smoothScrollUp, response.scroll_interval); 43 } else if (response.scroll_loop) { 44 setTimeout(smoothScrollDown, start_interval); 45 } 46 } 47 setTimeout(smoothScrollDown, start_interval); 48 } 49 }); 50 } 51 52 function afterLoad() { 53 if (document.location.hostname !== PLAY_MUSIC_HOSTNAME) { 54 sendSuccessToBGScript(); 55 return; 56 } 57 58 var playButton = document.querySelector('[data-id="play"]'); 59 60 //If play music website, if we do not see a play button 61 //that effectively means the music is not loaded. So do not 62 //report success load to test.js. 63 if (playButton) { 64 sendSuccessToBGScript(); 65 playButton.click(); 66 } 67 } 68 69 window.addEventListener('load', afterLoad); 70
