Finer build control with Selector
on Wednesday, 5th of August, 2020
In the last lesson, we looked at Consumer
. Before we move back to types of providers, we should look at Selector
. Selector is similar to consumer, but provides some fine control over when a widgets build
method is called. In a nutshell, selector
is a consumer that allows you to define exactly which properties from a model you care about.
For example, suppose you're working with a User
class that has 25 properties on it. You don't need to rebuild, or even pass in, a text widget that displays a user name when you update their phone numbers. Selector used for just that.
Because Selector
is so similar to Consumer
, we should just jump into a code example.
In my opinion, consumer is probably just fine for most use cases, unless you have an app that's so large that each build is a big deal. That said, this is all moot, because towards the end of this tutorial we will see even better ways to "consume" your models.