blockly/demos/codelab/app/scripts/main.js

/**
 * @license
 * Copyright 2017 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
 (function() {

  let currentButton;

  function handlePlay(event) {
    // Add code for playing sound.
  }

  function save(button) {
    // Add code for saving the behavior of a button.
  }

  function handleSave() {
    document.body.setAttribute('mode', 'edit');
    save(currentButton);
  }

  function enableEditMode() {
    document.body.setAttribute('mode', 'edit');
    document.querySelectorAll('.button').forEach(btn => {
      btn.removeEventListener('click', handlePlay);
      btn.addEventListener('click', enableBlocklyMode);
    });
  }

  function enableMakerMode() {
    document.body.setAttribute('mode', 'maker');
    document.querySelectorAll('.button').forEach(btn => {
      btn.addEventListener('click', handlePlay);
      btn.removeEventListener('click', enableBlocklyMode);
    });
  }

  function enableBlocklyMode(e) {
    document.body.setAttribute('mode', 'blockly');
    currentButton = e.target;
  }

  document.querySelector('#edit').addEventListener('click', enableEditMode);
  document.querySelector('#done').addEventListener('click', enableMakerMode);
  document.querySelector('#save').addEventListener('click', handleSave);

  enableMakerMode();

})();