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   1  /**
   2   * Manage delayed and timed actions
   3   *
   4   * @license GPL2 (http://www.gnu.org/licenses/gpl.html)
   5   * @author  Adrian Lang <lang@cosmocode.de>
   6   */
   7  
   8  /**
   9   * Provide a global callback for window.setTimeout
  10   *
  11   * To get a timeout for non-global functions, just call
  12   * delay.add(func, timeout).
  13   */
  14  var timer = {
  15      _cur_id: 0,
  16      _handlers: {},
  17  
  18      execDispatch: function (id) {
  19          timer._handlers[id]();
  20      },
  21  
  22      add: function (func, timeout) {
  23          var id = ++timer._cur_id;
  24          timer._handlers[id] = func;
  25          return window.setTimeout('timer.execDispatch(' + id + ')', timeout);
  26      }
  27  };
  28  
  29  /**
  30   * Provide a delayed start
  31   *
  32   * To call a function with a delay, just create a new Delay(func, timeout) and
  33   * call that object’s method “start”.
  34   */
  35  function Delay (func, timeout) {
  36      this.func = func;
  37      if (timeout) {
  38          this.timeout = timeout;
  39      }
  40  }
  41  
  42  Delay.prototype = {
  43      func: null,
  44      timeout: 500,
  45  
  46      delTimer: function () {
  47          if (this.timer !== null) {
  48              window.clearTimeout(this.timer);
  49              this.timer = null;
  50          }
  51      },
  52  
  53      start: function () {
  54          DEPRECATED('don\'t use the Delay object, use window.timeout with a callback instead');
  55          this.delTimer();
  56          var _this = this;
  57          this.timer = timer.add(function () { _this.exec.call(_this); },
  58                                 this.timeout);
  59  
  60          this._data = {
  61              _this: arguments[0],
  62              _params: Array.prototype.slice.call(arguments, 2)
  63          };
  64      },
  65  
  66      exec: function () {
  67          this.delTimer();
  68          this.func.call(this._data._this, this._data._params);
  69      }
  70  };