Composeable modifier: Pinch-To-Zoom

pinch-to-zoom-modifier.kt

fun Modifier.pinchToZoom(
    minZoom: Float? = null,
    maxZoom: Float? = null,
): Modifier = composed {
    var zoom by remember { mutableStateOf(1f) }
    val state = rememberTransformableState { scaleChange, _, _ ->
        val newZoom = (zoom * scaleChange).coerceIn(minZoom ?: MIN_VALUE, maxZoom ?: MAX_VALUE)
        zoom = newZoom
    }

    Modifier.graphicsLayer(
        scaleX = zoom,
        scaleY = zoom,
    ).transformable(state)
}