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EDITING: quiz_taking_police.js

/*
 * Copyright (C) 2017 - present Instructure, Inc.
 *
 * This file is part of Canvas.
 *
 * Canvas is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Affero General Public License as published by the Free
 * Software Foundation, version 3 of the License.
 *
 * Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Affero General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */

/*
The quiz taking police has arrived.

Spawn this worker and ask it (politely) to provide you with a reliable
 "stopwatch" which you can use to do interval-based tasks such as
 auto-submitting the quiz, or saving answers, in a consistent manner regardless
 of whether the window/tab currently has focus.

Example usage of the "startStopwatch" event:

var quizTakingPolice = require('path/to/quiz_taking_police');

if (!quizTakingPolice) {
        //browser doesn't support web workers
     } else {

// Notify me every 1.5 seconds:
       quizTakingPolice.postMessage({
         code: 'startStopwatch',
         frequency: 1500
       });

// Play a very loud siren every 1.5 seconds, even if the user has navigated
       // away from our website, for maximum annoyance
       quizTakingPolice.addEventListener('message', function(evt) {
         if (evt.data === 'stopwatchTick') {
           policeSiren.play();
         }
       });
     }
*/

/* eslint-disable no-restricted-globals, import/no-amd */

define([], function () {
  if (!window.Worker) {
    // if this browser doesn't support web workers, this module does nothing
    return
  }

function worker() {
    let stopwatch

self.addEventListener(
      'message',
      function (e) {
        const message = e.data || {}
        switch (message.code) {
          case 'startStopwatch':
            stopwatch = setInterval(function () {
              self.postMessage('stopwatchTick')
            }, message.frequency || 1000)
            break
          case 'stop':
            clearInterval(stopwatch)
            break
        }
      },
      false
    )
  }
  let code = worker.toString()
  code = code.substring(code.indexOf('{') + 1, code.lastIndexOf('}'))

const blob = new Blob([code], {type: 'application/javascript'})
  const quizTakingPolice = new Worker(URL.createObjectURL(blob))
  return quizTakingPolice
})

CANCEL

Name	Type	Size	Modified	Actions
↩ ..	DIR	—	—
📁 behaviors/	DIR	—	2023-09-24 03:36
📄 index.js	JS	34.8 KB	2023-09-24 03:39	EDIT
📄 quiz_taking_police.js	JS	2.6 KB	2023-09-24 03:36	EDIT