resume method

bool? resume({ Object instanceId = 0, })

Resume (after a pause) the ongoing foreground download

It is not usually necessary to use the result. Returns null if there is no ongoing download or the download is already running. Returns true if the download was paused. Returns false if the download was pausing ( in which case the download will not be paused).

---

By default, only one download is allowed at any one time, across all stores.

However, if necessary, multiple can be started by setting methods' instanceId argument to a unique value on methods. Whatever object instanceId is, it must have a valid and useful equality and hashCode implementation, as it is used as the key in a Map. Note that this unique value must be known and remembered to control the state of the download. Note that instances are shared across all stores.

Warning

Starting multiple simultaneous downloads may lead to a noticeable performance loss. Ensure you thoroughly test and profile your application.

Implementation

bool? resume({Object instanceId = 0}) {
  final instance = DownloadInstance.get(instanceId);
  if (instance == null ||
      (!instance.isPaused && instance.resumingAfterPause == null) ||
      instance.requestResume == null) {
    return null;
  }

  if (instance.pausingCompleter.isCompleted) {
    instance.requestResume!();
    return true;
  }

  if (!instance.resumingAfterPause!.isCompleted) {
    instance
      ..resumingAfterPause!.complete(false)
      ..pausingCompleter.future.then((_) => instance.requestResume!());
  }
  return false;
}