text: // Copyright (c) 2012 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.
  
  // To make sure we can uniquely identify each screenshot tab, add an id as a
  // query param to the url that displays the screenshot.
  // Note: It's OK that this is a global variable (and not in localStorage),
  // because the event page will stay open as long as any screenshot tabs are
  // open.
  var id = 100;
  
  // Listen for a click on the camera icon. On that click, take a screenshot.
  chrome.browserAction.onClicked.addListener(function () {
    chrome.tabs.captureVisibleTab(function (screenshotUrl) {
      var viewTabUrl = chrome.extension.getURL("screenshot.html?id=" + id++);
      var targetId = null;
  
      console.log(screenshotUrl);
  
      chrome.tabs.onUpdated.addListener(function listener(tabId, changedProps) {
        // We are waiting for the tab we opened to finish loading.
        // Check that the tab's id matches the tab we opened,
        // and that the tab is done loading.
        if (tabId != targetId || changedProps.status != "complete") return;
  
        // Passing the above test means this is the event we were waiting for.
        // There is nothing we need to do for future onUpdated events, so we
        // use removeListner to stop getting called when onUpdated events fire.
        chrome.tabs.onUpdated.removeListener(listener);
  
        // Look through all views to find the window which will display
        // the screenshot.  The url of the tab which will display the
        // screenshot includes a query parameter with a unique id, which
        // ensures that exactly one view will have the matching URL.
        var views = chrome.extension.getViews();
        for (var i = 0; i < views.length; i++) {
          var view = views[i];
          if (view.location.href == viewTabUrl) {
            view.setScreenshotUrl(screenshotUrl);
            break;
          }
        }
      });
  
      chrome.tabs.create(
        {
          url: viewTabUrl,
        },
        function (tab) {
          targetId = tab.id;
        }
      );
    });
  });
  