docs: function(evt) {
          if(this.passesTolerance(evt.xy)) {
              this.clearTimer();
              this.callback('move', [evt]);
              this.px = evt.xy;
              // clone the evt so original properties can be accessed even
              // if the browser deletes them during the delay
              evt = OpenLayers.Util.extend({}, evt);
              this.timerId = window.setTimeout(
                  OpenLayers.Function.bind(this.delayedCall, this, evt),
                  this.delay
              );
          }
          return !this.stopMove;
      }