ややcomplexなBLoCへの対応

"Flutter Meetup Tokyo #7"でのLT資料です。
https://flutter-jp.connpass.com/event/115645/

Transcript

1. ΍΍complexͳBLoC΁ͷରԠ Hiroki Matsue Jan 30th, 2019 Flutter Meetup Tokyo #7
2. Hiroki Matsue (@macs_6)
3. IIJmio޲͚ʮΈ͓εΠονʯ (Flutter੡)
4. analysis͸࢝Ίʹઃఆ͠Α͏ omit_local_variable_types༗ޮʹ͠·͠ΐ͏ https://www.dartlang.org/guides/language/effective-dart/design#avoid-type-annotating- initialized-local-variables
5. લճ͸Dart೉ಡԽͷ࿩
6. ࠓճ͸BLoCͷ࿩
7. BLoCͷ͓͞Β͍
8. Business Logic Componentsύλʔϯ
9. Google I/O '18: https://www.youtube.com/watch? v=RS36gBEp8OI
10. Google I/O '18: https://www.youtube.com/watch? v=RS36gBEp8OI
11. Google I/O '18: https://www.youtube.com/watch? v=RS36gBEp8OI
12. ϓϩτλΠϓҎ߱ͷϑΣʔζ͸ɺBLoC ΍Reduxಋೖ͓ͯ͘͠ͱ҆৺
13. ը໘1ͭʹBLoC1ͭͷγϯϓϧͳ ঢ়ଶ؅ཧͷ৔߹
14. buttonͦΕͧΕʹLoading΍ErrorΛ දݱ͍ͨ͠ (ΞΠςϜҰཡ͔Β1ͭΛ͓ؾʹೖΓɺΧʔυʹೖΕΔɺetc)
15. ͜Μͳ࣌
16. αϯϓϧ࣮૷Ͱͷ૝ఆσʔλߏ଄ - ܖ໿1 - sim1 - sim2 - ... - ܖ໿2 - ... - ...
17. ·ͣܖ໿ͱSIM2ͭͷBLoCΛܨ͙ You should avoid having one BLoC as a parameter of another BLoC. Instead, plug only the required outputs to the applicable inputs. This helps avoid tight coupling. https://medium.com/flutter-io/build-reactive-mobile-apps-in-flutter-companion- article-13950959e381 _bloc = SimBloc(widget.sim); // ܖ໿BLoCͷstreamΛSIMBLoC͕listen _subscription = widget.simsStream.listen(_bloc.sims.add);
18. ܨ͍ͩΒ2ͭ໨ͷBLoC಺ʹࢦఆͨ͠ SIMΛॲཧ͢ΔϩδοΫΛॻ͘
19. class SimBloc { SimBloc(Sim sim) { _simController.stream .map((list) => list.firstWhere((s) => s == sim, orElse: () => null)) .listen((sim) { if (sim == null) { log(errorMessage); // print log and send error to Sentry return; } _simSubject.add(SimState( switchingStatus: SimSwitchingStatus.fulfilled, isEnabled: sim.isEnabled, usage: sim.inMonthUsage(), )); ...
20. ࢀߟ: filiph/state_experiments@github (ಛʹbloc_complexपΓ)
21. BLoCಋೖͯ͠ྑ͔ͬͨ͜ͱ • ϘλϯͷΑ͏ͳ୯ҐͰͷঢ়ଶΛ؅ཧ͠΍͘͢ͳͬͨ • ςετ͕ॻ͖΍͘͢ͳͬͨ
22. Έ͓εΠονɺੋඇ͝ར༻͍ͩ͘͞
23. Thanks