Refactor the chat page

app/src/main/java/eu/m724/chatapp/activity/chat/ChatActivity.kt

@@ -4,9 +4,12 @@ import android.os.Bundle
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
+import androidx.activity.viewModels
 import androidx.compose.animation.animateColorAsState
 import androidx.compose.animation.core.animateDpAsState
+import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxSize
@@ -21,17 +24,16 @@ import androidx.compose.foundation.lazy.rememberLazyListState
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.Send
+import androidx.compose.material3.CenterAlignedTopAppBar
 import androidx.compose.material3.ElevatedCard
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
 import androidx.compose.material3.IconButtonDefaults
-import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Text
 import androidx.compose.material3.TextField
 import androidx.compose.material3.TextFieldDefaults
-import androidx.compose.material3.TopAppBar
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
@@ -43,48 +45,62 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.focus.FocusRequester
 import androidx.compose.ui.focus.focusRequester
 import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.platform.LocalSoftwareKeyboardController
 import androidx.compose.ui.unit.dp
-import androidx.compose.ui.unit.sp
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
-import androidx.lifecycle.viewmodel.compose.viewModel
 import dagger.hilt.android.AndroidEntryPoint
 import eu.m724.chatapp.activity.chat.compose.AnimatedChangingText
+import eu.m724.chatapp.activity.chat.compose.LanguageModelMistakeWarning
 import eu.m724.chatapp.activity.ui.theme.ChatAppTheme
 
 @AndroidEntryPoint
 class ChatActivity : ComponentActivity() {
+    private val viewModel: ChatActivityViewModel by viewModels()
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
         enableEdgeToEdge()
         setContent {
-            Content()
+            Content(viewModel)
         }
     }
 }
 
 @Composable
 fun Content(
-    viewModel: ChatActivityViewModel = viewModel()
+    viewModel: ChatActivityViewModel // = viewModel() doesn't work
 ) {
     val uiState by viewModel.uiState.collectAsStateWithLifecycle()
+    val localSoftwareKeyboardController = LocalSoftwareKeyboardController.current
 
     var composerValue by remember { mutableStateOf("") }
+    val composerFocusRequester = remember { FocusRequester() }
+
+    val lazyListState = rememberLazyListState()
+
+    LaunchedEffect(uiState.requestInProgress) { // TODO probably not the best way
+        if (!uiState.requestInProgress) {
+            composerValue = ""
+            composerFocusRequester.requestFocus() // TODO maybe make toggleable? or smart?
+        } else {
+            if (!uiState.messageHistory.isEmpty()) {
+                lazyListState.animateScrollToItem(uiState.messageHistory.size)
+            }
+        }
+    }
 
     ChatAppTheme {
         Scaffold(
-            modifier = Modifier.fillMaxSize(),
+            modifier = Modifier.fillMaxSize().imePadding(),
             topBar = {
                 ChatTopAppBar(uiState.chatTitle ?: "Start a new conversation")
             }
         ) { innerPadding ->
             Column(
-                modifier = Modifier.fillMaxSize().padding(innerPadding).imePadding(),
+                modifier = Modifier.fillMaxSize().padding(innerPadding),
                 horizontalAlignment = Alignment.CenterHorizontally
             ) {
-                val lazyListState = rememberLazyListState()
-
                 LazyColumn(
                     modifier = Modifier.fillMaxSize().weight(1f),
                     state = lazyListState
@@ -104,33 +120,34 @@ fun Content(
                             isComposing = !uiState.requestInProgress,
                             composerValue = composerValue,
                             onComposerValueChange = { composerValue = it },
+                            composerFocusRequester = composerFocusRequester,
                             responseValue = uiState.currentMessageResponse // TODO animate this
                         )
                     }
                 }
 
-                ComposerToolBar(
+                Box(
-                    modifier = Modifier.width(500.dp).padding(horizontal = 10.dp),
+                    modifier = Modifier.fillMaxWidth(),
-                    canSend = composerValue.isNotBlank() && !uiState.requestInProgress,
+                    contentAlignment = Alignment.CenterEnd
-                    onSend = {
+                ) {
-                        viewModel.sendMessage(composerValue)
+                    Column(
-                    }
+                        horizontalAlignment = Alignment.CenterHorizontally
-                )
+                    ) {
+                        ComposerToolBar(
+                            modifier = Modifier.width(500.dp).padding(horizontal = 10.dp),
+                            canSend = composerValue.isNotBlank() && !uiState.requestInProgress,
+                            onSend = {
+                                viewModel.sendMessage(composerValue)
+                            },
+                            onEmptySpaceClick = {
+                                composerFocusRequester.requestFocus()
+                                localSoftwareKeyboardController?.show()
+                            }
+                        )
 
-                Text(
+                        LanguageModelMistakeWarning(
-                    text = "AI can make mistakes, double-check.",
+                            modifier = Modifier.padding(vertical = 10.dp)
-                    modifier = Modifier.padding(vertical = 10.dp),
+                        )
-                    color = MaterialTheme.colorScheme.secondary.copy(alpha = 0.6f),
-                    fontSize = 12.sp,
-                    lineHeight = 14.sp
-                )
-
-                LaunchedEffect(uiState.requestInProgress) { // TODO probably not the best way
-                    if (!uiState.requestInProgress) {
-                        composerValue = ""
-                        if (!uiState.messageHistory.isEmpty()) {
-                            lazyListState.animateScrollToItem(uiState.messageHistory.size - 1)
-                        }
                     }
                 }
             }
@@ -143,9 +160,16 @@ fun Content(
 fun ChatTopAppBar(
     title: String
 ) {
-    TopAppBar(
+    CenterAlignedTopAppBar(
         title = {
-            AnimatedChangingText(title)
+            Box(
+                contentAlignment = Alignment.Center,
+                modifier = Modifier.fillMaxWidth(0.8f)
+            ) {
+                AnimatedChangingText(
+                    text = title,
+                )
+            }
         }
     )
 }
@@ -156,6 +180,7 @@ fun MessageExchange(
     isComposing: Boolean,
     composerValue: String,
     onComposerValueChange: (String) -> Unit = {},
+    composerFocusRequester: FocusRequester = FocusRequester(),
     responseValue: String = "",
 ) {
 
@@ -165,7 +190,8 @@ fun MessageExchange(
         MessageComposer(
             value = composerValue,
             onValueChange = onComposerValueChange,
-            enabled = isComposing
+            enabled = isComposing,
+            focusRequester = composerFocusRequester
         )
 
         if (!isComposing) {
@@ -184,6 +210,7 @@ fun MessageComposer(
     value: String,
     onValueChange: (String) -> Unit,
     enabled: Boolean,
+    focusRequester: FocusRequester,
     modifier: Modifier = Modifier
 ) {
     val textFieldPadding by animateDpAsState(
@@ -202,14 +229,6 @@ fun MessageComposer(
         }
     )
 
-    val focusRequester = remember { FocusRequester() }
-
-    LaunchedEffect(enabled) {
-        if (enabled) {
-            focusRequester.requestFocus()
-        }
-    }
-
     TextField(
         value = value,
         onValueChange = onValueChange,
@@ -238,7 +257,8 @@ fun MessageComposer(
 fun ComposerToolBar(
     modifier: Modifier = Modifier,
     canSend: Boolean,
-    onSend: () -> Unit
+    onSend: () -> Unit,
+    onEmptySpaceClick: () -> Unit
 ) {
     val sendButtonColor by animateColorAsState(
         targetValue = if (canSend) {
@@ -249,7 +269,9 @@ fun ComposerToolBar(
     )
 
     ElevatedCard(
-        modifier = modifier,
+        modifier = modifier.clickable(
+            onClick = onEmptySpaceClick
+        ),
         shape = RoundedCornerShape(100)
     ) {
         Row(
@@ -279,9 +301,3 @@ fun ComposerToolBar(
         }
     }
 }
-
-@Preview(showBackground = true)
-@Composable
-fun ContentPreview() {
-    Content()
-}

app/src/main/java/eu/m724/chatapp/activity/chat/ChatActivityViewModel.kt

@@ -35,7 +35,7 @@ class ChatActivityViewModel @Inject constructor(
 
         if (_uiState.value.chatTitle == null) {
             _uiState.update {
-                it.copy(chatTitle = message) // TODO
+                it.copy(chatTitle = "User says \"$message\"") // TODO
             }
         }
 

app/src/main/java/eu/m724/chatapp/activity/chat/compose/AnimatedChangingText.kt

@@ -6,36 +6,31 @@ import androidx.compose.animation.fadeIn
 import androidx.compose.animation.fadeOut
 import androidx.compose.animation.shrinkHorizontally
 import androidx.compose.animation.togetherWith
-import androidx.compose.foundation.layout.Arrangement
-import androidx.compose.foundation.layout.Row
-import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.text.style.TextOverflow
 
 @Composable
 fun AnimatedChangingText(
     text: String,
     modifier: Modifier = Modifier
 ) {
-    Row(
+    AnimatedContent(
-        modifier = modifier.fillMaxWidth(),
+        targetState = text,
-        horizontalArrangement = Arrangement.Center
+        modifier = modifier,
-    ) {
+        transitionSpec = {
-        AnimatedContent(
+            val enter = fadeIn() //  + expandHorizontally()
-            targetState = text,
+            val exit = fadeOut() + shrinkHorizontally(animationSpec = tween(800))
-            transitionSpec = {
-                val enter = fadeIn() //  + expandHorizontally()
-                val exit = fadeOut() + shrinkHorizontally(animationSpec = tween(800))
 
-                enter.togetherWith(exit)
+            enter.togetherWith(exit)
-            },
+        },
-            label = "Animated horizontal text"
+        label = "Animated horizontal text"
-        ) { targetText ->
+    ) { targetText ->
-            Text(
+        Text(
-                text = targetText,
+            text = targetText,
-                softWrap = false
+            softWrap = false,
-            )
+            overflow = TextOverflow.Ellipsis
-        }
+        )
     }
 }

app/src/main/java/eu/m724/chatapp/activity/chat/compose/LanguageModelMistakeWarning.kt

@@ -0,0 +1,20 @@
+package eu.m724.chatapp.activity.chat.compose
+
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.sp
+
+@Composable
+fun LanguageModelMistakeWarning(
+    modifier: Modifier = Modifier
+) {
+    Text(
+        text = "AI can make mistakes, double-check.",
+        modifier = modifier,
+        color = MaterialTheme.colorScheme.secondary.copy(alpha = 0.6f),
+        fontSize = 12.sp,
+        lineHeight = 14.sp
+    )
+}

gradle/libs.versions.toml

@@ -1,5 +1,5 @@
 [versions]
-agp = "8.9.3"
+agp = "8.10.1"
 kotlin = "2.1.21"
 coreKtx = "1.16.0"
 junit = "4.13.2"
@@ -9,7 +9,7 @@ appcompat = "1.7.1"
 material = "1.12.0"
 lifecycleRuntimeKtx = "2.9.1"
 activityCompose = "1.10.1"
-composeBom = "2025.06.00"
+composeBom = "2025.06.01"
 hilt = "2.56.2"
 ksp = "2.1.21-2.0.2"
 retrofit = "3.0.0"