Created
January 11, 2024 17:13
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Showcase For Compose
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| class MainActivity : ComponentActivity() { | |
| override fun onCreate(savedInstanceState: Bundle?) { | |
| super.onCreate(savedInstanceState) | |
| enableEdgeToEdge() | |
| setContent { | |
| ShowcaseForComposeTheme { | |
| MyScreen() | |
| } | |
| } | |
| } | |
| } | |
| @Composable | |
| fun SpotlightEffect(targetRect: Rect, baseRadius: Float) { | |
| var targetRadius by remember { mutableStateOf(baseRadius) } | |
| val animatedRadius by animateFloatAsState( | |
| targetValue = targetRadius, | |
| animationSpec = infiniteRepeatable( | |
| animation = tween(durationMillis = 1000, easing = LinearEasing), | |
| repeatMode = RepeatMode.Reverse | |
| ) | |
| ) | |
| LaunchedEffect(Unit) { | |
| while (true) { | |
| targetRadius = if (targetRadius == baseRadius) baseRadius + 220F else baseRadius | |
| delay(1000) | |
| } | |
| } | |
| Canvas(modifier = Modifier.fillMaxSize()) { | |
| with(drawContext.canvas.nativeCanvas) { | |
| val checkPoint = saveLayer(null, null) | |
| drawRect(color = Color.Black.copy(alpha = 0.85f)) | |
| val maskPaint = Paint().apply { | |
| color = Color(0f, 0f, 0f, 0f) | |
| blendMode = BlendMode.Clear | |
| } | |
| val spotlightCenterX = targetRect.left + targetRect.width / 2 | |
| val spotlightCenterY = targetRect.top + targetRect.height / 2 | |
| drawCircle( | |
| spotlightCenterX, | |
| spotlightCenterY, | |
| animatedRadius, | |
| maskPaint.asFrameworkPaint() | |
| ) | |
| restoreToCount(checkPoint) | |
| } | |
| } | |
| } | |
| @Composable | |
| fun MyScreen() { | |
| var showSpotlight by remember { mutableStateOf(true) } | |
| var buttonRect by remember { mutableStateOf(Rect(0f, 0f, 0f, 0f)) } | |
| val spotlightRadius = maxOf(buttonRect.width, buttonRect.height) / 2 | |
| BoxWithConstraints(modifier = Modifier.fillMaxSize(), contentAlignment = Alignment.Center) { | |
| Button( | |
| onClick = { showSpotlight = !showSpotlight }, | |
| modifier = Modifier | |
| .onGloballyPositioned { layoutCoordinates -> | |
| val position = layoutCoordinates.positionInRoot() | |
| val size = IntSize(layoutCoordinates.size.width, layoutCoordinates.size.height) | |
| buttonRect = Rect(position.x, position.y, position.x + size.width, position.y + size.height) | |
| } | |
| ) { | |
| Text("Hello Linkedin") | |
| } | |
| if (showSpotlight) { | |
| SpotlightEffect(targetRect = buttonRect, baseRadius = spotlightRadius) | |
| } | |
| } | |
| } |
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