LayoutAwareModifierNode

import androidx.compose.material.Text import androidx.compose.ui.Modifier import androidx.compose.ui.layout.onSizeChanged // Use onSizeChanged() for diagnostics. Use Layout or SubcomposeLayout if you want // to use the size of one component to affect the size of another component. Text(  "Hello $name",  Modifier.onSizeChanged { size -> println("The size of the Text in pixels is $size") }, )

import androidx.compose.animation.core.Animatable import androidx.compose.animation.core.AnimationVector2D import androidx.compose.animation.core.Spring.StiffnessMediumLow import androidx.compose.animation.core.VectorConverter import androidx.compose.animation.core.spring import androidx.compose.foundation.background import androidx.compose.foundation.border import androidx.compose.foundation.layout.Box import androidx.compose.foundation.layout.fillMaxSize import androidx.compose.foundation.layout.offset import androidx.compose.foundation.layout.padding import androidx.compose.foundation.layout.size import androidx.compose.runtime.Composable import androidx.compose.runtime.getValue import androidx.compose.runtime.mutableStateOf 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.graphics.Color import androidx.compose.ui.layout.onPlaced import androidx.compose.ui.layout.positionInParent import androidx.compose.ui.unit.IntOffset import androidx.compose.ui.unit.dp import androidx.compose.ui.unit.round fun Modifier.animatePlacement(): Modifier = composed {  val scope = rememberCoroutineScope()  var targetOffset by remember { mutableStateOf(IntOffset.Zero) }  var animatable by remember {  mutableStateOf<Animatable<IntOffset, AnimationVector2D>?>(null)  }  this.onPlaced {  // Calculate the position in the parent layout  targetOffset = it.positionInParent().round()  }  .offset {  // Animate to the new target offset when alignment changes.  val anim =  animatable  ?: Animatable(targetOffset, IntOffset.VectorConverter).also {  animatable = it  }  if (anim.targetValue != targetOffset) {  scope.launch {  anim.animateTo(targetOffset, spring(stiffness = StiffnessMediumLow))  }  }  // Offset the child in the opposite direction to the targetOffset, and slowly catch  // up to zero offset via an animation to achieve an overall animated movement.  animatable?.let { it.value - targetOffset } ?: IntOffset.Zero  } } @Composable fun AnimatedChildAlignment(alignment: Alignment) {  Box(Modifier.fillMaxSize().padding(4.dp).border(1.dp, Color.Red)) {  Box(  modifier =  Modifier.animatePlacement().align(alignment).size(100.dp).background(Color.Red)  )  } }

import androidx.compose.ui.Modifier import androidx.compose.ui.node.LayoutAwareModifierNode import androidx.compose.ui.node.ModifierNodeElement import androidx.compose.ui.platform.InspectorInfo import androidx.compose.ui.unit.IntSize class SizeLoggerNode(var id: String) : LayoutAwareModifierNode, Modifier.Node() {  override fun onRemeasured(size: IntSize) {  println("The size of $id was $size")  } } data class LogSizeElement(val id: String) : ModifierNodeElement<SizeLoggerNode>() {  override fun create(): SizeLoggerNode = SizeLoggerNode(id)  override fun update(node: SizeLoggerNode) {  node.id = id  }  override fun InspectorInfo.inspectableProperties() {  name = "logSize"  properties["id"] = id  } } fun Modifier.logSize(id: String) = this then LogSizeElement(id)