screen.kt

Column(modifier = Modifier.padding(16.dp)) {
      var approved by remember { mutableStateOf(false) }
      var frontCamera by remember { mutableStateOf(false) }
      val color = if (approved) Color.Green else Color.Red
      val image = if (frontCamera) Icons.Filled.AccountCircle else Icons.Filled.ShoppingCart
      
      Button(modifier = Modifier.width(120.dp), onClick = { approved = !approved }) {
          Text("Click me!")
      }
      Box {
          // Switch camera
          IconButton(
              onClick = { frontCamera = !frontCamera },
              modifier = Modifier
                  .align(Alignment.TopEnd)
                  .size(48.dp)
                  .offset((-16).dp, 16.dp)
          ) {
              Icon(
                  modifier = Modifier.fillMaxSize(),
                  imageVector = Icons.Filled.PlayArrow,
                  tint = Color.White,
                  contentDescription = null
              )
          }
          // Camera preview
          val largeRadialGradient = object : ShaderBrush() {
              override fun createShader(size: Size): Shader {
                  val biggerDimension = maxOf(size.height, size.width)
                  return RadialGradientShader(
                      colors = listOf(color, Color.Transparent),
                      center = size.center,
                      radius = biggerDimension / 2f,
                      colorStops = listOf(0f, 0.95f)
                  )
              }
          }
          Box(
              modifier = Modifier
                  .aspectRatio(1f)
                  .border(32.dp, largeRadialGradient, CircleShape)
                  .padding(32.dp)
                  .border(8.dp, color, CircleShape)
                  .clip(CircleShape)
          ) {
              Surface(
                  modifier = Modifier.fillMaxSize(),
                  color = Color.Black
              ) {
                  Icon(
                      imageVector = image,
                      contentDescription = null,
                      tint = Color.White
                  )
              }
          }
      }
  }