Unify sheets swipe-to-dismiss gating

2026-02-05 16:44:36 +08:00
parent 84dfd82ab8
commit 084317deac
5 changed files with 384 additions and 145 deletions
--- a/app/src/main/java/io/nekohasekai/sfa/compose/MainActivity.kt
+++ b/app/src/main/java/io/nekohasekai/sfa/compose/MainActivity.kt
@@ -1014,46 +1014,47 @@ class MainActivity :
                Column(
                    modifier = Modifier
                        .fillMaxWidth()
-                        .fillMaxHeight(0.9f),
+                        .fillMaxHeight(),
                ) {
-                    // Header
-                    Row(
-                        modifier = Modifier
-                            .fillMaxWidth()
-                            .padding(horizontal = 24.dp)
-                            .padding(bottom = 16.dp),
-                        horizontalArrangement = Arrangement.SpaceBetween,
-                        verticalAlignment = Alignment.CenterVertically,
-                    ) {
-                        Text(
-                            text = stringResource(R.string.title_groups),
-                            style = MaterialTheme.typography.headlineSmall,
-                            fontWeight = FontWeight.Medium,
-                            color = MaterialTheme.colorScheme.onSurface,
-                        )
-                        if (groupsUiState.groups.isNotEmpty()) {
-                            IconButton(onClick = { groupsViewModel.toggleAllGroups() }) {
-                                Icon(
-                                    imageVector = if (allCollapsed) {
-                                        Icons.Default.UnfoldMore
-                                    } else {
-                                        Icons.Default.UnfoldLess
-                                    },
-                                    contentDescription = if (allCollapsed) {
-                                        stringResource(R.string.expand_all)
-                                    } else {
-                                        stringResource(R.string.collapse_all)
-                                    },
-                                )
-                            }
-                        }
-                    }
-
                    // Groups content
                    GroupsCard(
                        serviceStatus = currentServiceStatus,
                        commandClient = dashboardViewModel.commandClient,
                        viewModel = groupsViewModel,
+                        listHeaderContent = {
+                            Row(
+                                modifier =
+                                Modifier
+                                    .fillMaxWidth()
+                                    .padding(horizontal = 8.dp),
+                                horizontalArrangement = Arrangement.SpaceBetween,
+                                verticalAlignment = Alignment.CenterVertically,
+                            ) {
+                                Text(
+                                    text = stringResource(R.string.title_groups),
+                                    style = MaterialTheme.typography.headlineSmall,
+                                    fontWeight = FontWeight.Medium,
+                                    color = MaterialTheme.colorScheme.onSurface,
+                                )
+                                if (groupsUiState.groups.isNotEmpty()) {
+                                    IconButton(onClick = { groupsViewModel.toggleAllGroups() }) {
+                                        Icon(
+                                            imageVector = if (allCollapsed) {
+                                                Icons.Default.UnfoldMore
+                                            } else {
+                                                Icons.Default.UnfoldLess
+                                            },
+                                            contentDescription = if (allCollapsed) {
+                                                stringResource(R.string.expand_all)
+                                            } else {
+                                                stringResource(R.string.collapse_all)
+                                            },
+                                        )
+                                    }
+                                }
+                            }
+                        },
+                        asSheet = true,
                        modifier = Modifier.fillMaxSize(),
                    )
                }
@@ -1097,7 +1098,7 @@ class MainActivity :
                Column(
                    modifier = Modifier
                        .fillMaxWidth()
-                        .fillMaxHeight(0.9f),
+                        .fillMaxHeight(),
                ) {
                    if (displayConnection != null) {
                        ConnectionDetailsScreen(
@@ -1106,11 +1107,13 @@ class MainActivity :
                            onClose = {
                                selectedConnectionId?.let { connectionsViewModel.closeConnection(it) }
                            },
+                            asSheet = true,
                        )
                    } else {
                        ConnectionsPage(
                            serviceStatus = currentServiceStatus,
                            viewModel = connectionsViewModel,
+                            asSheet = true,
                            showTitle = true,
                            onConnectionClick = { selectedConnectionId = it },
                            modifier = Modifier.fillMaxSize(),
--- a/app/src/main/java/io/nekohasekai/sfa/compose/screen/connections/ConnectionDetailsScreen.kt
+++ b/app/src/main/java/io/nekohasekai/sfa/compose/screen/connections/ConnectionDetailsScreen.kt
@@ -11,6 +11,7 @@ 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.rememberOverscrollEffect
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.text.selection.SelectionContainer
 import androidx.compose.foundation.verticalScroll
@@ -46,6 +47,7 @@ import androidx.compose.ui.unit.dp
 import io.nekohasekai.libbox.Libbox
 import io.nekohasekai.sfa.R
 import io.nekohasekai.sfa.compose.model.Connection
+import io.nekohasekai.sfa.compose.util.rememberSheetDismissFromContentOnlyIfGestureStartedAtTopModifier
 import java.text.SimpleDateFormat
 import java.util.Date
 import java.util.Locale
@@ -57,17 +59,25 @@ fun ConnectionDetailsScreen(
    onClose: () -> Unit,
    modifier: Modifier = Modifier,
    showHeader: Boolean = true,
+    asSheet: Boolean = false,
 ) {
    val dateTimeFormat = SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.getDefault())
    var showMenu by remember { mutableStateOf(false) }
    val scrollState = rememberScrollState()
-    val bounceBlockingConnection = rememberBounceBlockingNestedScrollConnection(scrollState)
+    val scrollModifier =
+        if (asSheet) {
+            rememberSheetDismissFromContentOnlyIfGestureStartedAtTopModifier {
+                scrollState.value == 0
+            }
+        } else {
+            Modifier.nestedScroll(rememberBounceBlockingNestedScrollConnection(scrollState))
+        }

    Column(
        modifier = modifier
            .fillMaxSize()
-            .nestedScroll(bounceBlockingConnection)
-            .verticalScroll(scrollState),
+            .then(scrollModifier)
+            .verticalScroll(scrollState, overscrollEffect = if (asSheet) null else rememberOverscrollEffect()),
    ) {
        if (showHeader) {
            Row(
--- a/app/src/main/java/io/nekohasekai/sfa/compose/screen/connections/ConnectionsScreen.kt
+++ b/app/src/main/java/io/nekohasekai/sfa/compose/screen/connections/ConnectionsScreen.kt
@@ -17,7 +17,7 @@ import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.LazyListState
 import androidx.compose.foundation.lazy.items
-import androidx.compose.foundation.lazy.rememberLazyListState
+import androidx.compose.foundation.rememberOverscrollEffect
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.ArrowBack
 import androidx.compose.material.icons.filled.Check
@@ -44,6 +44,7 @@ import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
@@ -62,6 +63,7 @@ import io.nekohasekai.sfa.compose.model.Connection
 import io.nekohasekai.sfa.compose.model.ConnectionSort
 import io.nekohasekai.sfa.compose.model.ConnectionStateFilter
 import io.nekohasekai.sfa.compose.topbar.OverrideTopBar
+import io.nekohasekai.sfa.compose.util.rememberSheetDismissFromContentOnlyIfGestureStartedAtTopModifier
 import io.nekohasekai.sfa.constant.Status

@OptIn(ExperimentalMaterial3Api::class)
@@ -69,6 +71,7 @@ import io.nekohasekai.sfa.constant.Status
 fun ConnectionsPage(
    serviceStatus: Status,
    viewModel: ConnectionsViewModel = viewModel(),
+    asSheet: Boolean = false,
    showTitle: Boolean = true,
    showTopBar: Boolean = false,
    onConnectionClick: (String) -> Unit = {},
@@ -87,14 +90,21 @@ fun ConnectionsPage(
        }
    }

-    Column(
-        modifier = modifier.fillMaxSize(),
-    ) {
-        Row(
-            modifier = Modifier
+    val headerRowModifier =
+        if (asSheet) {
+            Modifier
+                .fillMaxWidth()
+                .padding(bottom = 16.dp)
+        } else {
+            Modifier
                .fillMaxWidth()
                .padding(horizontal = 16.dp)
-                .padding(bottom = 16.dp),
+                .padding(bottom = 16.dp)
+        }
+
+    val headerContent: @Composable () -> Unit = {
+        Row(
+            modifier = headerRowModifier,
            horizontalArrangement = Arrangement.spacedBy(8.dp),
            verticalAlignment = Alignment.CenterVertically,
        ) {
@@ -258,13 +268,29 @@ fun ConnectionsPage(
                }
            }
        }
+    }

+    if (asSheet) {
        ConnectionsScreen(
            serviceStatus = serviceStatus,
            viewModel = viewModel,
            onConnectionClick = { connection -> onConnectionClick(connection.id) },
-            modifier = Modifier.fillMaxSize(),
+            listHeaderContent = headerContent,
+            asSheet = true,
+            modifier = modifier.fillMaxSize(),
        )
+    } else {
+        Column(
+            modifier = modifier.fillMaxSize(),
+        ) {
+            headerContent()
+            ConnectionsScreen(
+                serviceStatus = serviceStatus,
+                viewModel = viewModel,
+                onConnectionClick = { connection -> onConnectionClick(connection.id) },
+                modifier = Modifier.fillMaxSize(),
+            )
+        }
    }
 }

@@ -347,6 +373,8 @@ fun ConnectionsScreen(
    serviceStatus: Status,
    viewModel: ConnectionsViewModel = viewModel(),
    onConnectionClick: (Connection) -> Unit = {},
+    listHeaderContent: (@Composable () -> Unit)? = null,
+    asSheet: Boolean = false,
    modifier: Modifier = Modifier,
 ) {
    val uiState by viewModel.uiState.collectAsState()
@@ -365,73 +393,96 @@ fun ConnectionsScreen(
        viewModel.updateServiceStatus(serviceStatus)
    }

-    Column(modifier = modifier.fillMaxSize()) {
-        AnimatedVisibility(
-            visible = uiState.isSearchActive,
-            enter = expandVertically() + fadeIn(),
-            exit = shrinkVertically() + fadeOut(),
-        ) {
-            val focusRequester = remember { FocusRequester() }
+    val lazyListState = rememberSaveable(saver = LazyListState.Saver) { LazyListState() }

-            LaunchedEffect(Unit) {
-                focusRequester.requestFocus()
+    if (asSheet) {
+        val sheetSwipeToDismissModifier =
+            rememberSheetDismissFromContentOnlyIfGestureStartedAtTopModifier {
+                lazyListState.firstVisibleItemIndex == 0 &&
+                    lazyListState.firstVisibleItemScrollOffset == 0
            }
-
-            OutlinedTextField(
-                value = uiState.searchText,
-                onValueChange = { viewModel.setSearchText(it) },
-                modifier = Modifier
-                    .fillMaxWidth()
-                    .padding(horizontal = 16.dp)
-                    .padding(bottom = 8.dp)
-                    .focusRequester(focusRequester),
-                placeholder = { Text(stringResource(R.string.search_connections)) },
-                leadingIcon = { Icon(Icons.Default.Search, contentDescription = null) },
-                trailingIcon = {
-                    if (uiState.searchText.isNotEmpty()) {
-                        IconButton(onClick = { viewModel.setSearchText("") }) {
-                            Icon(Icons.Default.Clear, contentDescription = null)
-                        }
-                    }
-                },
-                singleLine = true,
-            )
-        }
-
-        when {
-            uiState.isLoading -> {
-                Box(
-                    modifier = Modifier.fillMaxSize(),
-                    contentAlignment = Alignment.Center,
-                ) {
-                    CircularProgressIndicator()
+        LazyColumn(
+            modifier =
+            modifier
+                .fillMaxSize()
+                .then(sheetSwipeToDismissModifier),
+            state = lazyListState,
+            contentPadding = PaddingValues(start = 16.dp, end = 16.dp, top = 8.dp, bottom = 16.dp),
+            verticalArrangement = Arrangement.spacedBy(8.dp),
+            overscrollEffect = null,
+        ) {
+            if (listHeaderContent != null) {
+                item(key = "connections_list_header") {
+                    listHeaderContent()
                }
            }

-            uiState.connections.isEmpty() -> {
-                Box(
-                    modifier = Modifier.fillMaxSize(),
-                    contentAlignment = Alignment.Center,
+            item(key = "connections_search") {
+                AnimatedVisibility(
+                    visible = uiState.isSearchActive,
+                    enter = expandVertically() + fadeIn(),
+                    exit = shrinkVertically() + fadeOut(),
                ) {
-                    Text(
-                        text = stringResource(R.string.empty_connections),
-                        style = MaterialTheme.typography.bodyLarge,
-                        color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    val focusRequester = remember { FocusRequester() }
+
+                    LaunchedEffect(Unit) {
+                        focusRequester.requestFocus()
+                    }
+
+                    OutlinedTextField(
+                        value = uiState.searchText,
+                        onValueChange = { viewModel.setSearchText(it) },
+                        modifier =
+                        Modifier
+                            .fillMaxWidth()
+                            .padding(bottom = 8.dp)
+                            .focusRequester(focusRequester),
+                        placeholder = { Text(stringResource(R.string.search_connections)) },
+                        leadingIcon = { Icon(Icons.Default.Search, contentDescription = null) },
+                        trailingIcon = {
+                            if (uiState.searchText.isNotEmpty()) {
+                                IconButton(onClick = { viewModel.setSearchText("") }) {
+                                    Icon(Icons.Default.Clear, contentDescription = null)
+                                }
+                            }
+                        },
+                        singleLine = true,
                    )
                }
            }

-            else -> {
-                val lazyListState = rememberLazyListState()
-                val bounceBlockingConnection = rememberBounceBlockingNestedScrollConnection(lazyListState)
-                LazyColumn(
-                    modifier = Modifier
-                        .fillMaxSize()
-                        .nestedScroll(bounceBlockingConnection),
-                    state = lazyListState,
-                    contentPadding = PaddingValues(start = 16.dp, end = 16.dp, bottom = 16.dp),
-                    verticalArrangement = Arrangement.spacedBy(8.dp),
-                ) {
+            when {
+                uiState.isLoading -> {
+                    item(key = "connections_loading") {
+                        Box(
+                            modifier = Modifier
+                                .fillMaxWidth()
+                                .padding(vertical = 48.dp),
+                            contentAlignment = Alignment.Center,
+                        ) {
+                            CircularProgressIndicator()
+                        }
+                    }
+                }
+
+                uiState.connections.isEmpty() -> {
+                    item(key = "connections_empty") {
+                        Box(
+                            modifier = Modifier
+                                .fillMaxWidth()
+                                .padding(vertical = 48.dp),
+                            contentAlignment = Alignment.Center,
+                        ) {
+                            Text(
+                                text = stringResource(R.string.empty_connections),
+                                style = MaterialTheme.typography.bodyLarge,
+                                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                            )
+                        }
+                    }
+                }
+
+                else -> {
                    items(
                        items = uiState.connections,
                        key = { it.id },
@@ -445,6 +496,90 @@ fun ConnectionsScreen(
                }
            }
        }
+    } else {
+        Column(modifier = modifier.fillMaxSize()) {
+            AnimatedVisibility(
+                visible = uiState.isSearchActive,
+                enter = expandVertically() + fadeIn(),
+                exit = shrinkVertically() + fadeOut(),
+            ) {
+                val focusRequester = remember { FocusRequester() }
+
+                LaunchedEffect(Unit) {
+                    focusRequester.requestFocus()
+                }
+
+                OutlinedTextField(
+                    value = uiState.searchText,
+                    onValueChange = { viewModel.setSearchText(it) },
+                    modifier =
+                    Modifier
+                        .fillMaxWidth()
+                        .padding(horizontal = 16.dp)
+                        .padding(bottom = 8.dp)
+                        .focusRequester(focusRequester),
+                    placeholder = { Text(stringResource(R.string.search_connections)) },
+                    leadingIcon = { Icon(Icons.Default.Search, contentDescription = null) },
+                    trailingIcon = {
+                        if (uiState.searchText.isNotEmpty()) {
+                            IconButton(onClick = { viewModel.setSearchText("") }) {
+                                Icon(Icons.Default.Clear, contentDescription = null)
+                            }
+                        }
+                    },
+                    singleLine = true,
+                )
+            }
+
+            when {
+                uiState.isLoading -> {
+                    Box(
+                        modifier = Modifier.fillMaxSize(),
+                        contentAlignment = Alignment.Center,
+                    ) {
+                        CircularProgressIndicator()
+                    }
+                }
+
+                uiState.connections.isEmpty() -> {
+                    Box(
+                        modifier = Modifier.fillMaxSize(),
+                        contentAlignment = Alignment.Center,
+                    ) {
+                        Text(
+                            text = stringResource(R.string.empty_connections),
+                            style = MaterialTheme.typography.bodyLarge,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant,
+                        )
+                    }
+                }
+
+                else -> {
+                    val bounceBlockingConnection = rememberBounceBlockingNestedScrollConnection(lazyListState)
+                    LazyColumn(
+                        modifier =
+                        Modifier
+                            .fillMaxSize()
+                            .nestedScroll(bounceBlockingConnection),
+                        state = lazyListState,
+                        contentPadding = PaddingValues(start = 16.dp, end = 16.dp, bottom = 16.dp),
+                        verticalArrangement = Arrangement.spacedBy(8.dp),
+                        overscrollEffect = rememberOverscrollEffect(),
+                    ) {
+                        items(
+                            items = uiState.connections,
+                            key = { it.id },
+                        ) { connection ->
+                            ConnectionItem(
+                                connection = connection,
+                                onClick = { onConnectionClick(connection) },
+                                onClose = { viewModel.closeConnection(connection.id) },
+                            )
+                        }
+                    }
+                }
+            }
+        }
    }
 }

--- a/app/src/main/java/io/nekohasekai/sfa/compose/screen/dashboard/GroupsCard.kt
+++ b/app/src/main/java/io/nekohasekai/sfa/compose/screen/dashboard/GroupsCard.kt
@@ -23,7 +23,7 @@ import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.LazyListState
 import androidx.compose.foundation.lazy.items
-import androidx.compose.foundation.lazy.rememberLazyListState
+import androidx.compose.foundation.rememberOverscrollEffect
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.ExpandMore
@@ -49,6 +49,7 @@ import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.key
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.geometry.Offset
@@ -70,6 +71,7 @@ import io.nekohasekai.sfa.compose.model.Group
 import io.nekohasekai.sfa.compose.model.GroupItem
 import io.nekohasekai.sfa.compose.screen.dashboard.groups.GroupsViewModel
 import io.nekohasekai.sfa.compose.topbar.OverrideTopBar
+import io.nekohasekai.sfa.compose.util.rememberSheetDismissFromContentOnlyIfGestureStartedAtTopModifier
 import io.nekohasekai.sfa.constant.Status
 import io.nekohasekai.sfa.utils.CommandClient

@@ -80,6 +82,8 @@ fun GroupsCard(
    commandClient: CommandClient? = null,
    viewModel: GroupsViewModel? = null,
    showTopBar: Boolean = false,
+    listHeaderContent: (@Composable () -> Unit)? = null,
+    asSheet: Boolean = false,
    modifier: Modifier = Modifier,
 ) {
    val actualViewModel: GroupsViewModel = viewModel ?: viewModel(
@@ -169,6 +173,8 @@ fun GroupsCard(
        onToggleExpanded = onToggleExpanded,
        onItemSelected = onItemSelected,
        onUrlTest = onUrlTest,
+        listHeaderContent = listHeaderContent,
+        asSheet = asSheet,
        modifier = modifier,
    )
 }
@@ -179,51 +185,78 @@ private fun GroupsCardContent(
    onToggleExpanded: (String) -> Unit,
    onItemSelected: (String, String) -> Unit,
    onUrlTest: (String) -> Unit,
+    listHeaderContent: (@Composable () -> Unit)? = null,
+    asSheet: Boolean = false,
    modifier: Modifier = Modifier,
 ) {
-    Column(modifier = modifier.fillMaxWidth()) {
-        // Groups content
-        if (uiState.isLoading) {
-            Box(
-                modifier =
-                Modifier
-                    .fillMaxWidth()
-                    .height(200.dp),
-                contentAlignment = Alignment.Center,
-            ) {
-                CircularProgressIndicator()
-            }
-        } else if (uiState.groups.isEmpty()) {
-            Box(
-                modifier =
-                Modifier
-                    .fillMaxWidth()
-                    .height(100.dp),
-                contentAlignment = Alignment.Center,
-            ) {
-                Text(
-                    text = "No groups available",
-                    style = MaterialTheme.typography.bodyMedium,
-                    color = MaterialTheme.colorScheme.onSurfaceVariant,
-                )
+    val lazyListState = rememberSaveable(saver = LazyListState.Saver) { LazyListState() }
+    val scrollModifier =
+        if (asSheet) {
+            rememberSheetDismissFromContentOnlyIfGestureStartedAtTopModifier {
+                lazyListState.firstVisibleItemIndex == 0 &&
+                    lazyListState.firstVisibleItemScrollOffset == 0
            }
        } else {
-            val lazyListState = rememberLazyListState()
-            val bounceBlockingConnection = rememberBounceBlockingNestedScrollConnection(lazyListState)
-            LazyColumn(
-                modifier = Modifier
-                    .fillMaxSize()
-                    .nestedScroll(bounceBlockingConnection),
-                state = lazyListState,
-                contentPadding =
-                PaddingValues(
-                    start = 16.dp,
-                    end = 16.dp,
-                    top = 8.dp,
-                    bottom = 16.dp,
-                ),
-                verticalArrangement = Arrangement.spacedBy(12.dp),
-            ) {
+            Modifier.nestedScroll(rememberBounceBlockingNestedScrollConnection(lazyListState))
+        }
+    val overscrollEffect = if (asSheet) null else rememberOverscrollEffect()
+
+    LazyColumn(
+        modifier =
+        modifier
+            .fillMaxSize()
+            .then(scrollModifier),
+        state = lazyListState,
+        contentPadding =
+        PaddingValues(
+            start = 16.dp,
+            end = 16.dp,
+            top = 8.dp,
+            bottom = 16.dp,
+        ),
+        verticalArrangement = Arrangement.spacedBy(12.dp),
+        overscrollEffect = overscrollEffect,
+    ) {
+        if (listHeaderContent != null) {
+            item(key = "groups_list_header") {
+                listHeaderContent()
+            }
+        }
+
+        when {
+            uiState.isLoading -> {
+                item(key = "groups_loading") {
+                    Box(
+                        modifier =
+                        Modifier
+                            .fillMaxWidth()
+                            .height(200.dp),
+                        contentAlignment = Alignment.Center,
+                    ) {
+                        CircularProgressIndicator()
+                    }
+                }
+            }
+
+            uiState.groups.isEmpty() -> {
+                item(key = "groups_empty") {
+                    Box(
+                        modifier =
+                        Modifier
+                            .fillMaxWidth()
+                            .height(100.dp),
+                        contentAlignment = Alignment.Center,
+                    ) {
+                        Text(
+                            text = "No groups available",
+                            style = MaterialTheme.typography.bodyMedium,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant,
+                        )
+                    }
+                }
+            }
+
+            else -> {
                items(
                    items = uiState.groups,
                    key = { it.tag },
--- a/app/src/main/java/io/nekohasekai/sfa/compose/util/SheetNestedScroll.kt
+++ b/app/src/main/java/io/nekohasekai/sfa/compose/util/SheetNestedScroll.kt
@@ -0,0 +1,58 @@
+package io.nekohasekai.sfa.compose.util
+
+import androidx.compose.foundation.gestures.awaitEachGesture
+import androidx.compose.foundation.gestures.awaitFirstDown
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberUpdatedState
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.input.nestedscroll.NestedScrollConnection
+import androidx.compose.ui.input.nestedscroll.NestedScrollSource
+import androidx.compose.ui.input.nestedscroll.nestedScroll
+import androidx.compose.ui.input.pointer.pointerInput
+import androidx.compose.ui.unit.Velocity
+
+@Composable
+fun rememberSheetDismissFromContentOnlyIfGestureStartedAtTopModifier(isAtTop: () -> Boolean): Modifier {
+    val isAtTopState = rememberUpdatedState(isAtTop)
+    val gestureStartedAtTop = remember { mutableStateOf(true) }
+
+    val nestedScrollConnection =
+        remember {
+            object : NestedScrollConnection {
+                override fun onPostScroll(consumed: Offset, available: Offset, source: NestedScrollSource): Offset {
+                    if (source != NestedScrollSource.UserInput) return Offset.Zero
+                    val startedAtTop = gestureStartedAtTop.value
+                    return when {
+                        available.y < 0 -> available
+                        available.y > 0 && !startedAtTop -> available
+                        else -> Offset.Zero
+                    }
+                }
+
+                override suspend fun onPostFling(consumed: Velocity, available: Velocity): Velocity {
+                    val startedAtTop = gestureStartedAtTop.value
+                    return when {
+                        available.y < 0 -> available
+                        available.y > 0 && !startedAtTop -> available
+                        else -> Velocity.Zero
+                    }
+                }
+            }
+        }
+
+    val gestureGateModifier =
+        Modifier.pointerInput(Unit) {
+            awaitEachGesture {
+                awaitFirstDown(requireUnconsumed = false)
+                gestureStartedAtTop.value = isAtTopState.value.invoke()
+                do {
+                    val event = awaitPointerEvent()
+                } while (event.changes.any { it.pressed })
+            }
+        }
+
+    return gestureGateModifier.nestedScroll(nestedScrollConnection)
+}