1 // Copyright (c) 2012 The Chromium 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 // To make sure we can uniquely identify each screenshot tab, add an id as a 6 // query param to the url that displays the screenshot. 7 // Note: It's OK that this is a global variable (and not in localStorage), 8 // because the event page will stay open as long as any screenshot tabs are 9 // open. 10 var id = 100; 11 12 // Listen for a click on the camera icon. On that click, take a screenshot. 13 chrome.browserAction.onClicked.addListener(function() { 14 15 chrome.tabs.captureVisibleTab(function(screenshotUrl) { 16 var viewTabUrl = chrome.extension.getURL('screenshot.html?id=' + id++) 17 var targetId = null; 18 19 chrome.tabs.onUpdated.addListener(function listener(tabId, changedProps) { 20 // We are waiting for the tab we opened to finish loading. 21 // Check that the tab's id matches the tab we opened, 22 // and that the tab is done loading. 23 if (tabId != targetId || changedProps.status != "complete") 24 return; 25 26 // Passing the above test means this is the event we were waiting for. 27 // There is nothing we need to do for future onUpdated events, so we 28 // use removeListner to stop getting called when onUpdated events fire. 29 chrome.tabs.onUpdated.removeListener(listener); 30 31 // Look through all views to find the window which will display 32 // the screenshot. The url of the tab which will display the 33 // screenshot includes a query parameter with a unique id, which 34 // ensures that exactly one view will have the matching URL. 35 var views = chrome.extension.getViews(); 36 for (var i = 0; i < views.length; i++) { 37 var view = views[i]; 38 if (view.location.href == viewTabUrl) { 39 view.setScreenshotUrl(screenshotUrl); 40 break; 41 } 42 } 43 }); 44 45 chrome.tabs.create({url: viewTabUrl}, function(tab) { 46 targetId = tab.id; 47 }); 48 }); 49 }); 50
