Add an experimental rememberGlidePainter API

[sjudd]

A separate painter can be used outside of GlideImage with other composables. It can also be used for crossfades or custom animations.

This is very similar in concept to Coil's implementation but the details are a bit different.

[arriolac]

This API is a bit unusual for Compose code. Typically a remember* method will return the direct mutable state object, rather than something wrapper in another type such as a Pair. For example, I'd expect that this would return a GlidePainter object instead. Might be good to create a class like that?

EDIT: Looks like lhs of the Pair is already a GlidePainter - might as well return that directly

[sjudd]

I think the disadvantage is that you expose a broader API surface, you get all of GlidePainter when all you need is a state.

I could extract an interface to avoid that:
[

GlidePainter extends Painter(public val state: GlidePainterState) { }

val painter = rememberGlidePainter(model)
match (painter.state) {
...
}

It feels slightly less nice to return a Painter interface that's just Painter + State? That is the way that Coil does this though.

[sjudd]

Done

[arriolac]

Typically, modifiers are used for UI elements and not in remember functions. I don't have a good suggestion here though on how to accomplish what you are trying to do however as I understand that the modifier is the mechanism for determining the image size.

[sjudd]

One other option is extracting a method that deals with modifiers and then having people pass in ResolvableGlideSize to rememberGlidePainter instead:

  val (size, updatedModifier) = waitForSizeFromModifier(modifier);
  val painter = rememberGlidePainter(model, size);
  Image(painter, contentDescription, updatedModifier)

Maybe that's a bit nicer?

[sjudd]

Done

[sjudd]

Replaced with #5230