Support dart entrypoint

[xiaowei-guan]

Typically, a Flutter app begins execution at the Dart method called main(), however this is not required. Developers can specify a different Dart entrypoint

[swift-kim]

The plugin build system (https://github.com/flutter-tizen/flutter-tizen/blob/20007aa24f83ff21ff3f5314410f16e448b0d75c/lib/tizen_plugins.dart#L194) should be a current blocker for this. I'll check if there's any way to work around if you give me some example of how to test this. (You're not referring to named routes, right?)

[swift-kim]

For those who are interested:

Custom entry points can be specified in Dart code using @pragma("vm:entry-point"): https://github.com/dart-lang/sdk/blob/master/runtime/docs/compiler/aot/entry_point_pragma.md

The Android embedder supports starting an engine from a custom entry point:

if (dartEntrypoint == null) {
  dartEntrypoint = DartEntrypoint.createDefault(); // main()
}

if (activeEngines.size() == 0) {
  engine = createEngine(context);
  engine.getDartExecutor().executeDartEntrypoint(dartEntrypoint);
} else {
  engine = activeEngines.get(0).spawn(context, dartEntrypoint);
}

What you are trying to do is to set different entry points for spawned engine instances, right?

If so, there's another approach to achieve a similar goal without creating multiple entry points by using Navigator. However, it will result in additional complexity as described here:

Developers who would like to use the same FlutterEngine between different Activitys and Fragments and switch the route between those displays need to setup a method channel and explicitly instruct their Dart code to change Navigator routes.

[bwikbs]

@xiaowei-guan
Is the purpose of this preparation for the FlutterEngineGroup API? If so, thanks! 😄

[xiaowei-guan]

For those who are interested:

Custom entry points can be specified in Dart code using @pragma("vm:entry-point"): https://github.com/dart-lang/sdk/blob/master/runtime/docs/compiler/aot/entry_point_pragma.md

The Android embedder supports starting an engine from a custom entry point:

if (dartEntrypoint == null) {
  dartEntrypoint = DartEntrypoint.createDefault(); // main()
}

if (activeEngines.size() == 0) {
  engine = createEngine(context);
  engine.getDartExecutor().executeDartEntrypoint(dartEntrypoint);
} else {
  engine = activeEngines.get(0).spawn(context, dartEntrypoint);
}

What you are trying to do is to set different entry points for spawned engine instances, right?

If so, there's another approach to achieve a similar goal without creating multiple entry points by using Navigator. However, it will result in additional complexity as described here:

Developers who would like to use the same FlutterEngine between different Activitys and Fragments and switch the route between those displays need to setup a method channel and explicitly instruct their Dart code to change Navigator routes.

Yes, we try set entry point for flutter engine on Tizen.

FlutterProjectArgs args = {};
args.custom_dart_entrypoint = 

I tested it today, if we set custom_dart_entrypoint , we can run this entrypoint successful.

[xiaowei-guan]

@xiaowei-guan
Is the purpose of this preparation for the FlutterEngineGroup API? If so, thanks! 😄
we

@xiaowei-guan
Is the purpose of this preparation for the FlutterEngineGroup API? If so, thanks! 😄

we add this for multiple screen based on EOM, run two engines, not share memeory.
and I find if we want implement FlutterEngineGroup, Entrypoint is required.

[swift-kim]

This feature may be needed by flutter-tizen/flutter-tizen#143.

Maybe we can implement this when #133 is merged (to avoid conflicts).

[xiaowei-guan]

Dart entrypoint for engine(xiaowei-guan@163bb68)

[swift-kim]

Implemented by #149.

[swift-kim]

We need to update the tool side as well in order to be able to use this feature.