Support events

[nuc134r]

libzt provides a way to pass a callback method that is called from background thread when an event happens.

The problem is that Dart and Flutter do not support invoking into isolate thread.

The ways to work that around:

• Fork libzt and use Dart_Port as explained here

• Wait for Dart team to implement calls from background threads

• Platform channels can be used as well but must be implemented for each platform separately which is not ideal. Also Java API passes a limited set of events and data

In first two scenarios libzt must be built with ZTS_C_API_ONLY defined (build script needs a fix for that) or else Android build will use JNI callback which is just two ints.

[cbenhagen]

Asynchronous callbacks with void returns can now be done with NativeCallable.listener from Dart 3.1.

[nuc134r]

Asynchronous callbacks with void returns can now be done with NativeCallable.listener from Dart 3.1.

This is great news, thank you. I hope I will find some time to finally implement it. For now I personally just poll network statuses every 50 ms or so.