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April 22, 2024 13:26
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| import android.os.Bundle | |
| import androidx.activity.ComponentActivity | |
| import androidx.activity.compose.setContent | |
| import androidx.activity.enableEdgeToEdge | |
| import androidx.compose.animation.ExperimentalSharedTransitionApi | |
| import androidx.compose.animation.SharedTransitionLayout | |
| import androidx.compose.foundation.background | |
| import androidx.compose.foundation.clickable | |
| import androidx.compose.foundation.layout.Box | |
| import androidx.compose.foundation.layout.Row | |
| import androidx.compose.foundation.layout.aspectRatio | |
| import androidx.compose.foundation.layout.fillMaxSize | |
| import androidx.compose.foundation.layout.fillMaxWidth | |
| import androidx.compose.foundation.layout.height | |
| import androidx.compose.foundation.layout.padding | |
| import androidx.compose.foundation.layout.size | |
| import androidx.compose.foundation.lazy.LazyColumn | |
| import androidx.compose.foundation.lazy.items | |
| import androidx.compose.foundation.shape.CircleShape | |
| import androidx.compose.material.icons.Icons | |
| import androidx.compose.material.icons.rounded.CheckCircle | |
| import androidx.compose.material3.HorizontalDivider | |
| import androidx.compose.material3.Icon | |
| import androidx.compose.material3.ListItem | |
| import androidx.compose.material3.MaterialTheme | |
| import androidx.compose.material3.Scaffold | |
| import androidx.compose.material3.Text | |
| import androidx.compose.runtime.getValue | |
| import androidx.compose.runtime.mutableStateOf | |
| import androidx.compose.runtime.remember | |
| import androidx.compose.runtime.setValue | |
| import androidx.compose.ui.Alignment | |
| import androidx.compose.ui.Modifier | |
| import androidx.compose.ui.draw.clip | |
| import androidx.compose.ui.graphics.Color | |
| import androidx.compose.ui.unit.dp | |
| import de.kuno.disappearingitems.ui.theme.DisappearingItemsTheme | |
| import kotlin.random.Random | |
| @OptIn(ExperimentalSharedTransitionApi::class) | |
| class MainActivity : ComponentActivity() { | |
| override fun onCreate(savedInstanceState: Bundle?) { | |
| super.onCreate(savedInstanceState) | |
| enableEdgeToEdge() | |
| setContent { | |
| TheTheme { | |
| SharedTransitionLayout { // Remove this -> no crash | |
| var expandedHeaders by remember { mutableStateOf(setOf<String>()) } | |
| val items = buildList { | |
| repeat(5) { header -> | |
| add(Element.Header(header.toString())) | |
| if (expandedHeaders.contains(header.toString())) { | |
| repeat(100) { | |
| add(Element.Item(header.toString(), it.toString(), Random.nextBoolean())) | |
| } | |
| } | |
| add(Element.Divider("$header-divider")) | |
| } | |
| } | |
| Scaffold( | |
| modifier = Modifier.fillMaxSize(), | |
| topBar = { | |
| Box(modifier = Modifier | |
| .fillMaxWidth() | |
| .height(100.dp)) | |
| } | |
| ) { innerPadding -> | |
| LazyColumn( | |
| Modifier.padding(innerPadding) | |
| ) { | |
| items(items, key = { it.id }, contentType = { it.javaClass.simpleName }) { element -> | |
| when (element) { | |
| is Element.Header -> ListItem( | |
| modifier = Modifier | |
| .animateItem() | |
| .clickable { | |
| if (expandedHeaders.contains(element.title)) { | |
| expandedHeaders = expandedHeaders | |
| .filter { it != element.title } | |
| .toSet() | |
| } else { | |
| expandedHeaders = expandedHeaders + element.title | |
| } | |
| }, | |
| headlineContent = { Text(text = "Header ${element.title}") } | |
| ) | |
| is Element.Item -> { | |
| Row( | |
| Modifier | |
| .animateItem() | |
| .padding(16.dp) | |
| ) { | |
| Box( | |
| modifier = Modifier | |
| .padding(16.dp) | |
| .height(48.dp) | |
| .aspectRatio(1f, true) | |
| .background(Color.Red, CircleShape) | |
| ) { | |
| Text( | |
| modifier = Modifier.align(Alignment.Center), | |
| text = "A" | |
| ) | |
| if (element.hasCheckmark) { | |
| Box( | |
| modifier = Modifier | |
| .align(Alignment.BottomEnd) | |
| .clip(CircleShape) | |
| .background(MaterialTheme.colorScheme.surface), | |
| ) { | |
| Icon( | |
| modifier = Modifier.size(16.dp), | |
| imageVector = Icons.Rounded.CheckCircle, | |
| contentDescription = null, | |
| ) | |
| } | |
| } | |
| } | |
| Text(text = element.text) | |
| } | |
| } | |
| is Element.Divider -> { | |
| HorizontalDivider(Modifier.animateItem()) | |
| } | |
| } | |
| } | |
| } | |
| } | |
| } | |
| } | |
| } | |
| } | |
| } | |
| sealed interface Element { | |
| val id: String | |
| data class Header( | |
| val title: String, | |
| ) : Element { | |
| override val id = title | |
| } | |
| data class Divider( | |
| override val id: String, | |
| ) : Element | |
| data class Item( | |
| private val headerId: String, | |
| val text: String, | |
| val hasCheckmark: Boolean, | |
| ) : Element { | |
| override val id = "$headerId-$text" | |
| } | |
| } |
Author
KlassenKonstantin
commented
Apr 22, 2024
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