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November 22, 2022 15:17
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import android.os.Bundle | |
import androidx.activity.ComponentActivity | |
import androidx.activity.compose.setContent | |
import androidx.compose.animation.core.Animatable | |
import androidx.compose.animation.core.Spring | |
import androidx.compose.animation.core.VectorConverter | |
import androidx.compose.animation.core.spring | |
import androidx.compose.foundation.BorderStroke | |
import androidx.compose.foundation.gestures.awaitFirstDown | |
import androidx.compose.foundation.gestures.forEachGesture | |
import androidx.compose.foundation.layout.Box | |
import androidx.compose.foundation.layout.fillMaxSize | |
import androidx.compose.foundation.layout.size | |
import androidx.compose.foundation.shape.RoundedCornerShape | |
import androidx.compose.material3.Card | |
import androidx.compose.material3.MaterialTheme | |
import androidx.compose.material3.Surface | |
import androidx.compose.runtime.Composable | |
import androidx.compose.runtime.remember | |
import androidx.compose.runtime.rememberCoroutineScope | |
import androidx.compose.ui.Alignment | |
import androidx.compose.ui.Modifier | |
import androidx.compose.ui.composed | |
import androidx.compose.ui.geometry.Offset | |
import androidx.compose.ui.graphics.Color | |
import androidx.compose.ui.graphics.graphicsLayer | |
import androidx.compose.ui.input.pointer.changedToUp | |
import androidx.compose.ui.input.pointer.pointerInput | |
import androidx.compose.ui.layout.ContentScale | |
import androidx.compose.ui.unit.IntSize | |
import androidx.compose.ui.unit.dp | |
import coil.compose.AsyncImage | |
import de.apuri.tilt.ui.theme.TiltTheme | |
import kotlinx.coroutines.launch | |
class MainActivity : ComponentActivity() { | |
override fun onCreate(savedInstanceState: Bundle?) { | |
super.onCreate(savedInstanceState) | |
setContent { | |
TiltTheme { | |
// A surface container using the 'background' color from the theme | |
Surface( | |
modifier = Modifier.fillMaxSize(), | |
color = MaterialTheme.colorScheme.background | |
) { | |
Box( | |
contentAlignment = Alignment.Center | |
) { | |
Card( | |
modifier = Modifier | |
.size(width = 300.dp, height = 400.dp) | |
.tiltOnTouch(), | |
shape = RoundedCornerShape(24.dp), | |
border = BorderStroke(2.dp, Color.Black) | |
) { | |
// Some content | |
} | |
} | |
} | |
} | |
} | |
} | |
} | |
fun Modifier.tiltOnTouch( | |
maxTiltDegrees: Float = DEF_MAX_TILT_DEGREES | |
) = this.then( | |
composed { | |
val scope = rememberCoroutineScope() | |
val offset = remember { Animatable(Offset.Zero, Offset.VectorConverter) } | |
pointerInput(Unit) { | |
forEachGesture { | |
awaitPointerEventScope { | |
var newOffset = awaitFirstDown().position.normalize(size) | |
scope.launch { | |
offset.animateTo(newOffset, spring) | |
} | |
do { | |
val event = awaitPointerEvent() | |
newOffset = event.changes.last().position.normalize(size) | |
scope.launch { | |
offset.animateTo(newOffset, spring) | |
} | |
} while (event.changes.none { it.changedToUp() }) | |
scope.launch { | |
offset.animateTo(Offset.Zero, releaseSpring) | |
} | |
} | |
} | |
}.tilt( | |
offset = offset.value, | |
maxTiltDegrees = maxTiltDegrees | |
) | |
} | |
) | |
private val spring = spring<Offset>(stiffness = Spring.StiffnessMediumLow) | |
private val releaseSpring = spring<Offset>(dampingRatio = Spring.DampingRatioHighBouncy, stiffness = 300f) | |
private fun Offset.normalize(size: IntSize) = Offset( | |
((x - (size.width / 2)) / (size.width / 2)).coerceIn(-1f..1f), | |
((y - (size.height / 2)) / (size.height / 2)).coerceIn(-1f..1f) | |
) | |
fun Modifier.tilt( | |
offset: Offset = Offset.Zero, | |
maxTiltDegrees: Float = DEF_MAX_TILT_DEGREES | |
) = this.graphicsLayer( | |
rotationY = offset.x * maxTiltDegrees, | |
rotationX = -offset.y * maxTiltDegrees, | |
cameraDistance = 20f | |
) | |
const val DEF_MAX_TILT_DEGREES = 15f |
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