wait_block.js

/**
 * @license
 * Copyright 2017 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */

/**
 * @fileoverview Example "wait" block that will pause the interpreter for a
 * number of seconds. Because wait is a blocking behaviour, such blocks will
 * only work in interpreted environments.
 *
 * See https://neil.fraser.name/software/JS-Interpreter/docs.html
 */

Blockly.defineBlocksWithJsonArray([
  {
    type: 'wait_seconds',
    message0: ' wait %1 seconds',
    args0: [
      {
        type: 'field_number',
        name: 'SECONDS',
        min: 0,
        max: 600,
        value: 1,
      },
    ],
    previousStatement: null,
    nextStatement: null,
    colour: '%{BKY_LOOPS_HUE}',
  },
]);

/**
 * Generator for wait block creates call to new method
 * <code>waitForSeconds()</code>.
 */
javascript.javascriptGenerator.forBlock['wait_seconds'] = function (block) {
  const seconds = Number(block.getFieldValue('SECONDS'));
  const code = 'waitForSeconds(' + seconds + ');\n';
  return code;
};

/**
 * Register the interpreter asynchronous function
 * <code>waitForSeconds()</code>.
 */
function initInterpreterWaitForSeconds(interpreter, globalObject) {
  // Ensure function name does not conflict with variable names.
  javascript.javascriptGenerator.addReservedWords('waitForSeconds');

  const wrapper = interpreter.createAsyncFunction(
    function (timeInSeconds, callback) {
      // Delay the call to the callback.
      setTimeout(callback, timeInSeconds * 1000);
    },
  );
  interpreter.setProperty(globalObject, 'waitForSeconds', wrapper);
}