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
   

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2. Hiroki Matsue (@macs_6)
   

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3. IIJmio޲͚ʮΈ͓εΠονʯ
   (Flutter੡)
   

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4. analysis͸࢝Ίʹઃఆ͠Α͏
   omit_local_variable_types༗ޮʹ͠·͠ΐ͏
   https://www.dartlang.org/guides/language/effective-dart/design#avoid-type-annotating-
   initialized-local-variables
   

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5. લճ͸Dart೉ಡԽͷ࿩
   

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6. ࠓճ͸BLoCͷ࿩
   

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7. BLoCͷ͓͞Β͍
   

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8. Business Logic
   Componentsύλʔϯ
   

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9. Google I/O '18: https://www.youtube.com/watch?
   v=RS36gBEp8OI
   

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10. Google I/O '18: https://www.youtube.com/watch?
    v=RS36gBEp8OI
    

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11. Google I/O '18: https://www.youtube.com/watch?
    v=RS36gBEp8OI
    

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12. ϓϩτλΠϓҎ߱ͷϑΣʔζ͸ɺBLoC
    ΍Reduxಋೖ͓ͯ͘͠ͱ҆৺
    

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13. ը໘1ͭʹBLoC1ͭͷγϯϓϧͳ
    ঢ়ଶ؅ཧͷ৔߹
    

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14. buttonͦΕͧΕʹLoading΍ErrorΛ
    දݱ͍ͨ͠
    (ΞΠςϜҰཡ͔Β1ͭΛ͓ؾʹೖΓɺΧʔυʹೖΕΔɺetc)
    

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15. ͜Μͳ࣌
    

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16. αϯϓϧ࣮૷Ͱͷ૝ఆσʔλߏ଄
    - ܖ໿1
    - sim1
    - sim2
    - ...
    - ܖ໿2
    - ...
    - ...
    

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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);
    

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18. ܨ͍ͩΒ2ͭ໨ͷBLoC಺ʹࢦఆͨ͠
    SIMΛॲཧ͢ΔϩδοΫΛॻ͘
    

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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(),
    ));
    ...
    

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20. ࢀߟ: filiph/state_experiments@github
    (ಛʹbloc_complexपΓ)
    

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21. BLoCಋೖͯ͠ྑ͔ͬͨ͜ͱ
    • ϘλϯͷΑ͏ͳ୯ҐͰͷঢ়ଶΛ؅ཧ͠΍͘͢ͳͬͨ
    • ςετ͕ॻ͖΍͘͢ͳͬͨ
    

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22. Έ͓εΠονɺੋඇ͝ར༻͍ͩ͘͞
    

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23. Thanks
    

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