How do you build a Reusable and Disposable Provider that shares state across widgets in Flutter?

Question

Problem

---

Im working on a Flutter app where I need a SelectableProvider that accepts a generic type <T>and manages a list of selected items. The provider is used to manage the state between the GridView and PageView pages.

This Provider should be disposable because this Flutter app will allow multiple scenarios for the user to make selections of item <T>.

What I've Tried

---

• While it's not the solution I want, I have it setup as a global ChangeNotifierProvider where I just clear the state when it's not in use.

  • However, I've also used this Provider to manage animationControllers and animations to allow me to use Stateless widgets. And I'm not sure how efficient it would be to allow a Provider as large as it is running in the background with other fairly large Providers I have defined.

• I've wrapped the PageView page with with ChangeNotifierProvider.value(value: selectableProvider, ... but in DevTools Provider tool, it's showing duplicate SelectableProviders. Clearly that's not effective either.

Code

---

SelectableProvider

class SelectableProvider<T> with ChangeNotifier implements TickerProvider {
 final List<T> _selectedItems = [];
 
 late AnimationController _gridAnimationController;
 late Animation<double> _gridAnimation;

 SelectableProvider() {
  _initAnimationControllers();
  _initAnimations();
 }

 /* rest of code */
}

GridView

ChangeNotifierProvider(
 create: (_) => SelectableProvider<MyItemType>(),
 child: GridView.builder(/* builder */),
)

onPressed To PageView

Navigator.push(
 context, 
 MaterialPageRoute(
  builder: (context) => ChangeNotifierProvider.value(
   value: selectableProvider,
   builder: (context, child) => PageView(),
  ),
 ),
)

Conclusion

So basically, is there any way I can initiate the SelectableProvider inside this specific scope instead of globally above MaterialApp? And how do I prevent the Provider from duplicating itself to cover both Widgets? Or is that completely normal?