feat: don't allow sending too long messages

Signed-off-by: Infi <infi@infi.sh>

app/src/main/java/chat/revolt/components/chat/NativeMessageField.kt

@@ -158,6 +158,7 @@ fun NativeMessageField(
     forceSendButton: Boolean = false,
     canAttach: Boolean = true,
     disabled: Boolean = false,
+    failedValidation: Boolean = false,
     serverId: String? = null,
     channelId: String? = null,
     editMode: Boolean = false,
@@ -176,7 +177,8 @@ fun NativeMessageField(
     var requestFocus by remember { mutableStateOf({}) }
     var clearFocus by remember { mutableStateOf({}) }
 
-    val sendButtonVisible = (value.isNotBlank() || forceSendButton) && !disabled
+    val sendButtonVisible =
+        (value.isNotBlank() || forceSendButton) && !disabled && !failedValidation
 
     val density = LocalDensity.current
 
@@ -184,6 +186,7 @@ fun NativeMessageField(
 
     val selectionColour = MaterialTheme.colorScheme.primary.copy(alpha = 0.2f).toArgb()
     val cursorColour = MaterialTheme.colorScheme.primary.toArgb()
+    val failedValidationColour = MaterialTheme.colorScheme.error.toArgb()
     val contentColour = LocalContentColor.current.toArgb()
     val placeholderColour = LocalContentColor.current.copy(alpha = 0.5f).toArgb()
 
@@ -524,6 +527,11 @@ fun NativeMessageField(
                     }
                     it.hint = it.context.getString(placeholderResource, channelName)
                     it.serverId = serverId
+                    if (failedValidation) {
+                        it.setTextColor(failedValidationColour)
+                    } else {
+                        it.setTextColor(contentColour)
+                    }
                 },
                 modifier = Modifier
                     .weight(1f)

app/src/main/java/chat/revolt/screens/chat/views/channel/ChannelScreen.kt

@@ -5,7 +5,6 @@ import android.net.Uri
 import android.os.Build
 import android.os.Environment
 import android.provider.MediaStore
-import android.util.Log
 import android.widget.Toast
 import androidx.activity.compose.BackHandler
 import androidx.activity.compose.rememberLauncherForActivityResult
@@ -73,8 +72,6 @@ import chat.revolt.api.routes.channel.react
 import chat.revolt.api.routes.microservices.autumn.FileArgs
 import chat.revolt.api.schemas.Channel
 import chat.revolt.api.schemas.ChannelType
-import chat.revolt.callbacks.Action
-import chat.revolt.callbacks.ActionChannel
 import chat.revolt.components.chat.Message
 import chat.revolt.components.chat.NativeMessageField
 import chat.revolt.components.chat.SystemMessage
@@ -288,6 +285,12 @@ fun ChannelScreen(
             }
         }
 
+        val isMessageTooLong by remember(viewModel.pendingMessageContent) {
+            derivedStateOf {
+                viewModel.pendingMessageContent.length > MAX_MESSAGE_LENGTH
+            }
+        }
+
         LaunchedEffect(isScrolledToTop) {
             snapshotFlow { isScrolledToTop.value }
                 .distinctUntilChanged()
@@ -530,6 +533,7 @@ fun ChannelScreen(
                         serverId = channel?.server,
                         editMode = viewModel.editingMessage != null,
                         cancelEdit = viewModel::cancelEditingMessage,
+                        failedValidation = isMessageTooLong,
                         onFocusChange = { nowFocused ->
                             if (nowFocused && viewModel.currentBottomPane != BottomPane.None) {
                                 viewModel.currentBottomPane = BottomPane.None

app/src/main/java/chat/revolt/screens/chat/views/channel/ChannelScreenViewModel.kt

@@ -59,6 +59,8 @@ import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import kotlinx.datetime.Instant
 
+const val MAX_MESSAGE_LENGTH = 2000
+
 sealed class BottomPane {
     data object None : BottomPane()
     data object InbuiltMediaPicker : BottomPane()