IssueTracker

Note Posting in here as I did not have permissions to post to AndroidStudio > DesignTools > Compose Preview

Description:

The ability to have multiple @PreviewParameters in a Preview such that all combinations of said parameters are auto-generated.

Use Case:

A simple example has been shown below. However, in practice, these might be sequences of more complicated data classes:

class SampleTitleStrings: PreviewParameterProvider<String> {
    override val values = sequenceOf(
        "This is short title",
        "This is a very very very very very long title",
    )
}

class SampleBodyStrings: PreviewParameterProvider<String?> {
    override val values = sequenceOf(
        "This is short body",
        "This is a very very very very very long body",
        null
    )
}

@Preview
@Composable
private fun BodyPreview(
    @PreviewParameter(SampleTitleStrings::class) title: String,
    @PreviewParameter(SampleBodyStrings::class) body: String?,
) {
    MyCustomComponent(title = title, body = body)
}

The above would then spit out previews for MyCustomComponent containing all combinations of SampleTitleStrings & SampleBodyStrings. eg:

title = "This is short title", body = "This is short body"
title = "This is short title", body = "This is a very very very very very long body"
title = "This is short title", body = null

title = "This is a very very very very very long title", body = "This is short body"
title = "This is a very very very very very long title", body = "This is a very very very very very long body"
title = "This is a very very very very very long title", body = null