lyblog/wp-includes/js/dist/priority-queue.js

this["wp"] = this["wp"] || {}; this["wp"]["priorityQueue"] =
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/***/ 330:
/***/ (function(module, __webpack_exports__, __webpack_require__) {

"use strict";
__webpack_require__.r(__webpack_exports__);
/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "createQueue", function() { return createQueue; });
var requestIdleCallback = window.requestIdleCallback ? window.requestIdleCallback : window.requestAnimationFrame;
/**
 * Creates a context-aware queue that only executes
 * the last task of a given context.
 *
 * @example
 *```js
 * import { createQueue } from '@wordpress/priority-queue';
 *
 * const queue = createQueue();
 *
 * // Context objects.
 * const ctx1 = {};
 * const ctx2 = {};
 *
 * // For a given context in the queue, only the last callback is executed.
 * queue.add( ctx1, () => console.log( 'This will be printed first' ) );
 * queue.add( ctx2, () => console.log( 'This won\'t be printed' ) );
 * queue.add( ctx2, () => console.log( 'This will be printed second' ) );
 *```
 *
 * @return {Object} Queue object with `add` and `flush` methods.
 */

var createQueue = function createQueue() {
  var waitingList = [];
  var elementsMap = new WeakMap();
  var isRunning = false;

  var runWaitingList = function runWaitingList(deadline) {
    do {
      if (waitingList.length === 0) {
        isRunning = false;
        return;
      }

      var nextElement = waitingList.shift();
      elementsMap.get(nextElement)();
      elementsMap.delete(nextElement);
    } while (deadline && deadline.timeRemaining && deadline.timeRemaining() > 0);

    requestIdleCallback(runWaitingList);
  };

  var add = function add(element, item) {
    if (!elementsMap.has(element)) {
      waitingList.push(element);
    }

    elementsMap.set(element, item);

    if (!isRunning) {
      isRunning = true;
      requestIdleCallback(runWaitingList);
    }
  };

  var flush = function flush(element) {
    if (!elementsMap.has(element)) {
      return false;
    }

    elementsMap.delete(element);
    var index = waitingList.indexOf(element);
    waitingList.splice(index, 1);
    return true;
  };

  return {
    add: add,
    flush: flush
  };
};


/***/ })

/******/ });