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/wp-includes/js/dist/ -> priority-queue.js (source)

   1  this["wp"] = this["wp"] || {}; this["wp"]["priorityQueue"] =
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  87  /************************************************************************/
  88  /******/ ({
  89  
  90  /***/ 330:
  91  /***/ (function(module, __webpack_exports__, __webpack_require__) {
  92  
  93  "use strict";
  94  __webpack_require__.r(__webpack_exports__);
  95  /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "createQueue", function() { return createQueue; });
  96  var requestIdleCallback = window.requestIdleCallback ? window.requestIdleCallback : window.requestAnimationFrame;
  97  /**
  98   * Creates a context-aware queue that only executes
  99   * the last task of a given context.
 100   *
 101   * @example
 102   *```js
 103   * import { createQueue } from '@wordpress/priority-queue';
 104   *
 105   * const queue = createQueue();
 106   *
 107   * // Context objects.
 108   * const ctx1 = {};
 109   * const ctx2 = {};
 110   *
 111   * // For a given context in the queue, only the last callback is executed.
 112   * queue.add( ctx1, () => console.log( 'This will be printed first' ) );
 113   * queue.add( ctx2, () => console.log( 'This won\'t be printed' ) );
 114   * queue.add( ctx2, () => console.log( 'This will be printed second' ) );
 115   *```
 116   *
 117   * @return {Object} Queue object with `add` and `flush` methods.
 118   */
 119  
 120  var createQueue = function createQueue() {
 121    var waitingList = [];
 122    var elementsMap = new WeakMap();
 123    var isRunning = false;
 124  
 125    var runWaitingList = function runWaitingList(deadline) {
 126      do {
 127        if (waitingList.length === 0) {
 128          isRunning = false;
 129          return;
 130        }
 131  
 132        var nextElement = waitingList.shift();
 133        elementsMap.get(nextElement)();
 134        elementsMap.delete(nextElement);
 135      } while (deadline && deadline.timeRemaining && deadline.timeRemaining() > 0);
 136  
 137      requestIdleCallback(runWaitingList);
 138    };
 139  
 140    var add = function add(element, item) {
 141      if (!elementsMap.has(element)) {
 142        waitingList.push(element);
 143      }
 144  
 145      elementsMap.set(element, item);
 146  
 147      if (!isRunning) {
 148        isRunning = true;
 149        requestIdleCallback(runWaitingList);
 150      }
 151    };
 152  
 153    var flush = function flush(element) {
 154      if (!elementsMap.has(element)) {
 155        return false;
 156      }
 157  
 158      elementsMap.delete(element);
 159      var index = waitingList.indexOf(element);
 160      waitingList.splice(index, 1);
 161      return true;
 162    };
 163  
 164    return {
 165      add: add,
 166      flush: flush
 167    };
 168  };
 169  
 170  
 171  /***/ })
 172  
 173  /******/ });


Generated: Sat Nov 23 20:47:33 2019 Cross-referenced by PHPXref 0.7