onMouseWheel method

void onMouseWheel(dynamic event)

Implementation

void onMouseWheel(event) {
  if (scope.enabled == false ||
      scope.enableZoom == false ||
      state != OrbitState.none) return;

  //event.preventDefault();
  scope.dispatchEvent(_startEvent);
  handleMouseWheel(event);
  scope.dispatchEvent(_endEvent);
}