Build when method

[MaldonadoAndres]

Is there any way to tell my build method to only do a rebuild when certain states are issued?

[rrousselGit]

You can use ref.watch(provider.select((value) => value.someProperty)) to only rebuild when someProperty changes

[MaldonadoAndres]

Nvm I find an answer on stackoverflow that explain how to do it and it works perfectly.
Thanks a lot for your help with this you literally just save my job 🤣

[cbenhagen]

@MaldonadoAndres would you mind sharing your solution for others who stumble upon your question?

[dleurs]

Possible to also get the previous state value inside .select((value) ?
Because we also want to rebuild only if the previous state argument is different that the current state argument

[gdurandrexel]

Isn't it the behavior of select() already? It checks the equality of the values returned by the selector. Of course you need a proper implementation of == for the returned value. And note that you are not forced to return a field of your state: it can be any object.

[dleurs]

No for example :
0 : ref.watch(provider.select((state) => state.variableA == true)

1. MyState(variableA: false, variableB: false) -> No rebuild
2. MyState(variableA: true, variableB: false) -> Rebuild
3. MyState(variableA: true, variableB: true) -> Rebuild again but it was not necessary

I would like ref.watch(provider.select((previous, current) => previous.variableA != current.variableA && current.variableA == true)