Question 225169 in Flutter Question posted in
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Flutter – Riverpod 2.0 – How to access onDispose callback?

I have this class

class EntryController {
  final TabController? tabController;
  final List<DictionaryEntry> history;

  EntryController({
    required this.history,
    this.tabController,
  });

  EntryController copyWith({
    TabController? tabController,
    List<DictionaryEntry>? history,
  }) {
    return EntryController(
      history: history ?? this.history,
      tabController: tabController ?? this.tabController,
    );
  }
}

And i have this Riverpod notifier

@riverpod
class ExpandedEntryController extends _$ExpandedEntryController {
  @override
  EntryController build() {
    return EntryController(
      history: [],
    );
  }

  void updateState(EntryController controller) => state = controller;

  void seeRelatedWord(DictionaryEntry relatedWord) {
    state.history.add(relatedWord);
    state.tabController!.animateTo(0);
  }

  void onDispose() {
    state.tabController!.dispose();
  }
}

I know that by default it has de autoDispose( ) method, but when it disposes i suppose i should dispose the tabController right? How should i do it?

Thanks

Tags:

2

Answers


  1. 0

    Don’t override this.onDispose()!. Add

    ref.onDispose(() => state.tabController?.dispose());

    to your build(). That should take care of disposing that controller when this controller goes away.

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  2. 0

    Correct your code like this:

    @riverpod
class ExpandedEntryController extends _$ExpandedEntryController {
  @override
  EntryController build() {

    ref.onDispose(() {
      state.tabController?.dispose();
    });

    return EntryController(
      history: [],
    );
  }

    You can also use ref.watch or ref.listen safely in the build method of your notifier.

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