I have a vague memory that it used to be possible to have a composable as an extension function, but...

# compose

[enighma]

I have a vague memory that it used to be possible to have a composable as an extension function, but now I get a warning that it's not(might've never worked).

Here's a sample situation of what I naively want: @Composable LazyGridScope.myFun() = ...
Is there a workaround or suggested solution for this? I guess I can pass it as a param and run scope.apply{}.

[Alex Vanyo]

I think this might be a case of needing to know more what you’re trying to achieve?

Specifically for the `Lazy*Scope`s, extensions on those probably shouldn’t be composable directly.

[enighma]

I have a LazyGrid and I want to encapsulate each row into a composable, but maybe I'm thinking of it the wrong way and each item instead should be extracted.

[enighma]

I can get what I want with a regular function that looks like this LazyGridScope.myFun() I just feel I have to jump through a few more hoops than I expected

[enighma]

What is interesting is that it works with some scopes but not others. For instance I can do exactly what I want above with a Column

[Alex Vanyo]

Lazy is a bit of a special case:

// @Composable
LazyColumn {
    // not @Composable
    item {
        // @Composable
        Text(...)
    }
}

The nice lambdas hide the types and obscure what’s going on a bit. Right inside LazyColumn is setting up a DSL for which items to (potentially) emit. So each item is defining a part of the lazy content, but since it’s lazy, it may not actually get executed.

So when you define an extension on LazyGridScope, you’re saying “here’s a portion of content to contribute to the DSL of items to show,” as opposed to saying “here’s content to directly place into the scope”

The latter case makes sense with a ColumnScope, since you are directly adding normal composables.

[enighma]

I see, so it's a special case then.

On the topic of LazyGrid is there a mechanism to align content of a cell?

I did not find any info in the doc nor looking at the API itself.

[enighma]

To put it in other words: If I call fillMaxSize() the composable is still not not filling up its cell, and that is fine if I at least could align it, within it.

[Stylianos Gakis]

Does something like this https://kotlinlang.slack.com/archives/CJLTWPH7S/p1660831694887379?thread_ts=1660823965.926509&cid=CJLTWPH7S fit your needs by any chance?