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feat: auto-scroll chat on new messages

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Scroll to bottom when sending a message, and conditionally scroll on
received messages when the user is already near the latest messages.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Kohei 2026-02-18 22:17:46 +09:00
parent d18b7c8a24
commit 96f559abbb
2 changed files with 22 additions and 0 deletions
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6
android/feature/chat/src/main/java/io/picoclaw/android/feature/chat/ChatViewModel.kt
View file

@ -8,8 +8,10 @@ import io.picoclaw.android.core.domain.usecase.LoadMoreMessagesUseCase
import io.picoclaw.android.core.domain.usecase.ObserveConnectionUseCase import io.picoclaw.android.core.domain.usecase.ObserveConnectionUseCase
import io.picoclaw.android.core.domain.usecase.ObserveMessagesUseCase import io.picoclaw.android.core.domain.usecase.ObserveMessagesUseCase
import io.picoclaw.android.core.domain.usecase.SendMessageUseCase import io.picoclaw.android.core.domain.usecase.SendMessageUseCase
import kotlinx.coroutines.flow.MutableSharedFlow
import kotlinx.coroutines.flow.MutableStateFlow import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asSharedFlow
import kotlinx.coroutines.flow.asStateFlow import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.flow.update import kotlinx.coroutines.flow.update
import kotlinx.coroutines.launch import kotlinx.coroutines.launch
@ -26,6 +28,9 @@ class ChatViewModel(
private val _uiState = MutableStateFlow(ChatUiState()) private val _uiState = MutableStateFlow(ChatUiState())
val uiState: StateFlow<ChatUiState> = _uiState.asStateFlow() val uiState: StateFlow<ChatUiState> = _uiState.asStateFlow()
private val _scrollToBottom = MutableSharedFlow<Unit>(extraBufferCapacity = 1)
val scrollToBottom = _scrollToBottom.asSharedFlow()
init { init {
connectChat() connectChat()
@ -51,6 +56,7 @@ class ChatViewModel(
val state = _uiState.value val state = _uiState.value
val text = state.inputText.trim() val text = state.inputText.trim()
if (text.isEmpty() && state.pendingImages.isEmpty()) return if (text.isEmpty() && state.pendingImages.isEmpty()) return
_scrollToBottom.tryEmit(Unit)
_uiState.update { it.copy(inputText = "", pendingImages = emptyList()) } _uiState.update { it.copy(inputText = "", pendingImages = emptyList()) }
viewModelScope.launch { viewModelScope.launch {
try { try {

16
android/feature/chat/src/main/java/io/picoclaw/android/feature/chat/screen/ChatScreen.kt
View file

@ -99,6 +99,22 @@ fun ChatScreen(
if (shouldLoadMore) viewModel.onEvent(ChatEvent.OnLoadMore) if (shouldLoadMore) viewModel.onEvent(ChatEvent.OnLoadMore)
} }
LaunchedEffect(Unit) {
viewModel.scrollToBottom.collect {
listState.animateScrollToItem(0)
}
}
val isNearBottom by remember {
derivedStateOf { listState.firstVisibleItemIndex <= 3 }
}
LaunchedEffect(uiState.messages.size) {
if (isNearBottom) {
listState.animateScrollToItem(0)
}
}
Scaffold( Scaffold(
topBar = { topBar = {
TopAppBar(title = { Text("PicoClaw") }) TopAppBar(title = { Text("PicoClaw") })