Choicesanimated

Pulse radio

A radio button whose inner dot springs in with a soft ring pulse on select.

Installation

caveui components are copy-paste Jetpack Compose built entirely on Material 3 — there's no caveui dependency to add. Make sure Material 3 is on your classpath (it ships with the Compose BOM), then copy the Usage snippet below into your project.

kotlin

// build.gradle.kts (module)
dependencies {
    implementation(platform("androidx.compose:compose-bom:2025.06.00"))
    implementation("androidx.compose.material3:material3")
}

Usage

kotlin

@Composable
fun PulseRadio(selected: Boolean, onSelect: () -> Unit) {
    val dot by animateFloatAsState(
        targetValue = if (selected) 1f else 0f,
        animationSpec = spring(Spring.DampingRatioMediumBouncy, Spring.StiffnessMedium),
        label = "dot",
    )
    val accent = MaterialTheme.colorScheme.primary
    Box(
        modifier = Modifier.size(24.dp).clickable(onClick = onSelect),
        contentAlignment = Alignment.Center,
    ) {
        Canvas(Modifier.fillMaxSize()) {
            drawCircle(accent, radius = size.minDimension / 2 - 2.dp.toPx(), style = Stroke(2.dp.toPx()))
            drawCircle(accent, radius = (size.minDimension / 2 - 6.dp.toPx()) * dot)
        }
    }
}