I'm having problems importing weight function for Column ```Column( modifier = modifier.weight(1...

# compose

[Pablo]

I'm having problems importing weight function for Column

Column(
    modifier = modifier.weight(1f),

It gives me this error: Unresolved reference: weight
It gives me 4 import possibilities but none of them do work

[Caleb Cook]

Is the column in a scope where weight applies, such as another column or a row?

[Pablo]

good point, not, is a composable function with a column

[Pablo]

that composable function is used in some other composables

[Pablo]

those composables do have box, column etc...

[Pablo]

how to resolve this?

[Zach Klippenstein (he/him) [MOD]]

One way is to give your composable a RowScope or ColumnScope receiver.

[Zach Klippenstein (he/him) [MOD]]

Another way is to pass the weight in from wherever you’re calling your composable, where the row/column scope is available.

[Pablo]

can I see samples of that somewhere?

[Pablo]

didn't learnt that in the codelabs

[Alex Styl]

@Pablo

@Composable
@Sampled
fun SimpleColumn() {
    Column {
        // The child with no weight will have the specified size.
        Box(Modifier.size(40.dp, 80.dp).background(Color.Magenta))
        // Has weight, the child will occupy half of the remaining height.
        Box(Modifier.width(40.dp).weight(1f).background(Color.Yellow))
        // Has weight and does not fill, the child will occupy at most half of the remaining height.
        // Therefore it will occupy 80.dp (its preferred height) if the assigned height is larger.
        Box(
            Modifier.size(40.dp, 80.dp)
                .weight(1f, fill = false)
                .background(Color.Green)
        )
    }
}

You can find other examples @ https://www.composables.com/foundation-layout/column

[Pablo]

well there you are simply putting composables inside other composables

[Pablo]

I was trying to add unnecessary parent compossables

[Alex Styl]

the parent is the one who is deciding where the children will be placed. the weight() modifier comes with column/row

[Alex Styl]

Do i understand this right that you want to have a composable that takes the remaining space wherever it is used?

[Pablo]

no, I just have another fun that calls this fun, and this fun generates a composable that needs to specify a weight, but It can't because it doesn't know who is containing him

[romainguy]

You can use one of the two solutions @Zach Klippenstein (he/him) [MOD] mentioned above, They are the canonical way of doing this

[Pablo]

maybe can someone give some samples of that?

[romainguy]

@Composable
fun RowScope.MyComposable(modifier: Modifier = Modifier) {
    Column(modifier = modifier.weight(1f), …) {
        …
    }
}

[romainguy]

Or you don't use the RowScope (or ColumnScope) receiver, remove the weight(1f) from inside MyComposable and let the caller pass the weight modifier

[Pablo]

thank you