Source: lib/util/timer.js

  1. /**
  2.  * @license
  3.  * Copyright 2016 Google Inc.
  4.  *
  5.  * Licensed under the Apache License, Version 2.0 (the "License");
  6.  * you may not use this file except in compliance with the License.
  7.  * You may obtain a copy of the License at
  8.  *
  9.  *     http://www.apache.org/licenses/LICENSE-2.0
  10.  *
  11.  * Unless required by applicable law or agreed to in writing, software
  12.  * distributed under the License is distributed on an "AS IS" BASIS,
  13.  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14.  * See the License for the specific language governing permissions and
  15.  * limitations under the License.
  16.  */
  18. goog.provide('shaka.util.Timer');
  21. /**
  22.  * A simple cancelable timer.
  23.  * @param {Function} callback
  24.  * @constructor
  25.  * @struct
  26.  */
  27. shaka.util.Timer = function(callback) {
  28.   /** @private {?number} */
  29.   this.id_ = null;
  31.   /** @private {Function} */
  32.   this.callback_ = (function() {
  33.     this.id_ = null;
  34.     callback();
  35.   }.bind(this));
  36. };
  39. /**
  40.  * Cancel the timer, if it's running.
  41.  */
  42. shaka.util.Timer.prototype.cancel = function() {
  43.   if (this.id_ != null) {
  44.     clearTimeout(this.id_);
  45.     this.id_ = null;
  46.   }
  47. };
  50. /**
  51.  * Schedule the timer, canceling any previous scheduling.
  52.  * @param {number} seconds
  53.  */
  54. shaka.util.Timer.prototype.schedule = function(seconds) {
  55.   this.cancel();
  56.   this.id_ = setTimeout(this.callback_, seconds * 1000);
  57. };
  60. /**
  61.  * Schedule the timer, canceling any previous scheduling. The timer will
  62.  * automatically reschedule after the callback fires.
  63.  * @param {number} seconds
  64.  */
  65. shaka.util.Timer.prototype.scheduleRepeated = function(seconds) {
  66.   this.cancel();
  67.   let repeat = (function() {
  68.     this.callback_();
  69.     this.id_ = setTimeout(repeat, seconds * 1000);
  70.   }.bind(this));
  71.   this.id_ = setTimeout(repeat, seconds * 1000);
  72. };