feat: migrate ThinPaddingTextField to BasicTextField(TextFieldState) for GIF keyboard support

Migrates all new post screens from the old BasicTextField(TextFieldValue)
to the new BasicTextField(TextFieldState) API, which properly sets
EditorInfo.contentMimeTypes to enable GIF keyboard input.

Key changes:
- Add TextFieldState-based ThinPaddingTextField overload (keep old for readonly dropdowns)
- Create UrlUserTagOutputTransformation for the new OutputTransformation API
- Create TextFieldState extension functions (insertUrlAtCursor, replaceCurrentWord, currentWord)
- Update IMessageField interface to use TextFieldState + onMessageChanged()
- Migrate all IMessageField implementors: ChannelNewMessageViewModel,
  ChatNewMessageViewModel, NewProductViewModel, NewPublicMessageViewModel,
  CommentPostViewModel, ShortNotePostViewModel, LongFormPostViewModel
- Update PreviewState to accept String instead of TextFieldValue
- Add TextFieldState overload to UserSuggestionState.replaceCurrentWord()
- Update all post screen call sites

https://claude.ai/code/session_01FDGf1Zi1pVvzFi3JY5agnJ

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/actions/UrlUserTagOutputTransformation.kt

@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.amethyst.ui.actions
+
+import androidx.compose.foundation.text.input.OutputTransformation
+import androidx.compose.foundation.text.input.TextFieldBuffer
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.text.SpanStyle
+import androidx.compose.ui.text.style.TextDecoration
+import com.vitorpamplona.amethyst.model.LocalCache
+import com.vitorpamplona.quartz.nip01Core.core.toHexKey
+import com.vitorpamplona.quartz.nip19Bech32.decodePublicKey
+import kotlin.coroutines.cancellation.CancellationException
+
+class UrlUserTagOutputTransformation(
+    val color: Color,
+) : OutputTransformation {
+    override fun TextFieldBuffer.transformOutput() {
+        val text = asCharSequence().toString()
+
+        // Find all @npub mentions using regex and replace in reverse order
+        // so that earlier indices remain valid after replacements.
+        val npubRegex = Regex("@npub1[a-z0-9]{58}")
+        val matches = npubRegex.findAll(text).toList().reversed()
+
+        for (match in matches) {
+            try {
+                val key = decodePublicKey(match.value.removePrefix("@"))
+                val user = LocalCache.getOrCreateUser(key.toHexKey())
+                val displayName = "@${user.toBestDisplayName()}"
+
+                replace(match.range.first, match.range.last + 1, displayName)
+
+                // Apply color styling to the replaced display name
+                addAnnotation(
+                    SpanStyle(color = color, textDecoration = TextDecoration.None),
+                    match.range.first,
+                    match.range.first + displayName.length,
+                )
+            } catch (e: Exception) {
+                if (e is CancellationException) throw e
+            }
+        }
+
+        // Highlight URLs in remaining text
+        highlightUrls(color)
+    }
+}
+
+private fun TextFieldBuffer.highlightUrls(color: Color) {
+    val text = asCharSequence().toString()
+    val urlPattern = android.util.Patterns.WEB_URL
+
+    val matcher = urlPattern.matcher(text)
+    while (matcher.find()) {
+        addAnnotation(
+            SpanStyle(color = color, textDecoration = TextDecoration.None),
+            matcher.start(),
+            matcher.end(),
+        )
+    }
+}

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/components/ThinPaddingTextField.kt

@@ -27,6 +27,10 @@ import androidx.compose.foundation.layout.defaultMinSize
 import androidx.compose.foundation.text.BasicTextField
 import androidx.compose.foundation.text.KeyboardActions
 import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.foundation.text.input.InputTransformation
+import androidx.compose.foundation.text.input.OutputTransformation
+import androidx.compose.foundation.text.input.TextFieldLineLimits
+import androidx.compose.foundation.text.input.TextFieldState
 import androidx.compose.foundation.text.selection.LocalTextSelectionColors
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.LocalTextStyle
@@ -35,8 +39,11 @@ import androidx.compose.material3.TextFieldColors
 import androidx.compose.material3.TextFieldDefaults
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.CompositionLocalProvider
+import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberUpdatedState
+import androidx.compose.runtime.snapshotFlow
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Shape
 import androidx.compose.ui.graphics.SolidColor
@@ -50,6 +57,124 @@ import com.vitorpamplona.amethyst.ui.theme.placeholderText
 // COPIED FROM TEXT FIELD
 // The only change is the contentPadding below
 
+// New TextFieldState-based overload for GIF keyboard support
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun ThinPaddingTextField(
+    state: TextFieldState,
+    modifier: Modifier = Modifier,
+    onTextChanged: (() -> Unit)? = null,
+    enabled: Boolean = true,
+    readOnly: Boolean = false,
+    textStyle: TextStyle = LocalTextStyle.current,
+    inputTransformation: InputTransformation? = null,
+    outputTransformation: OutputTransformation? = null,
+    label: @Composable (() -> Unit)? = null,
+    placeholder: @Composable (() -> Unit)? = null,
+    leadingIcon: @Composable (() -> Unit)? = null,
+    trailingIcon: @Composable (() -> Unit)? = null,
+    prefix: @Composable (() -> Unit)? = null,
+    suffix: @Composable (() -> Unit)? = null,
+    supportingText: @Composable (() -> Unit)? = null,
+    isError: Boolean = false,
+    keyboardOptions: KeyboardOptions = KeyboardOptions.Default,
+    singleLine: Boolean = false,
+    maxLines: Int = if (singleLine) 1 else Int.MAX_VALUE,
+    minLines: Int = 1,
+    interactionSource: MutableInteractionSource? = null,
+    shape: Shape = TextFieldDefaults.shape,
+    colors: TextFieldColors = TextFieldDefaults.colors(),
+    contentPadding: PaddingValues =
+        if (label == null) {
+            TextFieldDefaults.contentPaddingWithoutLabel(
+                start = 10.dp,
+                top = 12.dp,
+                end = 10.dp,
+                bottom = 12.dp,
+            )
+        } else {
+            TextFieldDefaults.contentPaddingWithLabel(
+                start = 10.dp,
+                top = 12.dp,
+                end = 10.dp,
+                bottom = 12.dp,
+            )
+        },
+) {
+    @Suppress("NAME_SHADOWING")
+    val interactionSource = interactionSource ?: remember { MutableInteractionSource() }
+
+    if (onTextChanged != null) {
+        val callback by rememberUpdatedState(onTextChanged)
+        LaunchedEffect(state) {
+            snapshotFlow { state.text }
+                .collect { callback() }
+        }
+    }
+
+    val textColor =
+        textStyle.color.takeOrElse {
+            val focused by interactionSource.collectIsFocusedAsState()
+            when {
+                !enabled -> MaterialTheme.colorScheme.placeholderText
+                isError -> MaterialTheme.colorScheme.onSurface
+                focused -> MaterialTheme.colorScheme.onSurface
+                else -> MaterialTheme.colorScheme.onSurface
+            }
+        }
+    val mergedTextStyle = textStyle.merge(TextStyle(color = textColor))
+
+    val lineLimits =
+        if (singleLine) {
+            TextFieldLineLimits.SingleLine
+        } else {
+            TextFieldLineLimits.MultiLine(minLines, maxLines)
+        }
+
+    CompositionLocalProvider(LocalTextSelectionColors provides colors.textSelectionColors) {
+        BasicTextField(
+            state = state,
+            modifier =
+                modifier
+                    .defaultMinSize(
+                        minWidth = TextFieldDefaults.MinWidth,
+                        minHeight = 36.dp,
+                    ),
+            enabled = enabled,
+            readOnly = readOnly,
+            textStyle = mergedTextStyle,
+            cursorBrush = SolidColor(MaterialTheme.colorScheme.primary),
+            keyboardOptions = keyboardOptions,
+            lineLimits = lineLimits,
+            interactionSource = interactionSource,
+            inputTransformation = inputTransformation,
+            outputTransformation = outputTransformation,
+            decorator = { innerTextField ->
+                TextFieldDefaults.DecorationBox(
+                    value = state.text.toString(),
+                    visualTransformation = VisualTransformation.None,
+                    innerTextField = innerTextField,
+                    placeholder = placeholder,
+                    label = label,
+                    leadingIcon = leadingIcon,
+                    trailingIcon = trailingIcon,
+                    prefix = prefix,
+                    suffix = suffix,
+                    supportingText = supportingText,
+                    shape = shape,
+                    singleLine = singleLine,
+                    enabled = enabled,
+                    isError = isError,
+                    interactionSource = interactionSource,
+                    colors = colors,
+                    contentPadding = contentPadding,
+                )
+            },
+        )
+    }
+}
+
+// Legacy TextFieldValue-based overload (kept for readonly dropdown fields)
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun ThinPaddingTextField(
@@ -76,7 +201,6 @@ fun ThinPaddingTextField(
     interactionSource: MutableInteractionSource? = null,
     shape: Shape = TextFieldDefaults.shape,
     colors: TextFieldColors = TextFieldDefaults.colors(),
-    // new fields
     contentPadding: PaddingValues =
         if (label == null) {
             TextFieldDefaults.contentPaddingWithoutLabel(
@@ -113,6 +237,7 @@ fun ThinPaddingTextField(
     val mergedTextStyle = textStyle.merge(TextStyle(color = textColor))
 
     CompositionLocalProvider(LocalTextSelectionColors provides colors.textSelectionColors) {
+        @Suppress("DEPRECATION")
         BasicTextField(
             value = value,
             modifier =

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/creators/messagefield/IMessageField.kt

@@ -20,10 +20,10 @@
  */
 package com.vitorpamplona.amethyst.ui.note.creators.messagefield
 
-import androidx.compose.ui.text.input.TextFieldValue
+import androidx.compose.foundation.text.input.TextFieldState
 
 interface IMessageField {
-    var message: TextFieldValue
+    val message: TextFieldState
 
-    fun updateMessage(newMessage: TextFieldValue)
+    fun onMessageChanged()
 }

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/creators/messagefield/MessageField.kt

@@ -39,7 +39,7 @@ import androidx.compose.ui.platform.LocalSoftwareKeyboardController
 import androidx.compose.ui.text.input.KeyboardCapitalization
 import androidx.compose.ui.text.style.TextDirection
 import androidx.compose.ui.unit.dp
-import com.vitorpamplona.amethyst.ui.actions.UrlUserTagTransformation
+import com.vitorpamplona.amethyst.ui.actions.UrlUserTagOutputTransformation
 import com.vitorpamplona.amethyst.ui.components.ThinPaddingTextField
 import com.vitorpamplona.amethyst.ui.stringRes
 import com.vitorpamplona.amethyst.ui.theme.placeholderText
@@ -65,8 +65,8 @@ fun MessageField(
     }
 
     ThinPaddingTextField(
-        value = viewModel.message,
+        state = viewModel.message,
-        onValueChange = viewModel::updateMessage,
+        onTextChanged = viewModel::onMessageChanged,
         keyboardOptions =
             KeyboardOptions.Default.copy(
                 capitalization = KeyboardCapitalization.Sentences,
@@ -91,7 +91,7 @@ fun MessageField(
                 focusedBorderColor = Color.Transparent,
                 unfocusedBorderColor = Color.Transparent,
             ),
-        visualTransformation = UrlUserTagTransformation(MaterialTheme.colorScheme.primary),
+        outputTransformation = UrlUserTagOutputTransformation(MaterialTheme.colorScheme.primary),
         textStyle = LocalTextStyle.current.copy(textDirection = TextDirection.Content),
         contentPadding =
             TextFieldDefaults.contentPaddingWithoutLabel(

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/creators/previews/PreviewState.kt

@@ -21,7 +21,6 @@
 package com.vitorpamplona.amethyst.ui.note.creators.previews
 
 import androidx.compose.runtime.Stable
-import androidx.compose.ui.text.input.TextFieldValue
 import com.vitorpamplona.amethyst.service.CachedUrlParser
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.FlowPreview
@@ -33,22 +32,22 @@ import kotlinx.coroutines.flow.map
 
 @Stable
 class PreviewState {
-    var source = MutableStateFlow(TextFieldValue(""))
+    var source = MutableStateFlow("")
 
     @OptIn(FlowPreview::class)
     val results =
         source
             .debounce(500)
             .map {
-                CachedUrlParser.parseValidUrls(it.text)
+                CachedUrlParser.parseValidUrls(it)
             }.distinctUntilChanged()
             .flowOn(Dispatchers.IO)
 
     fun reset() {
-        source.tryEmit(TextFieldValue(""))
+        source.tryEmit("")
     }
 
-    fun update(text: TextFieldValue) {
+    fun update(text: String) {
         source.tryEmit(text)
     }
 }

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/creators/userSuggestions/UserSuggestionState.kt

@@ -20,6 +20,7 @@
  */
 package com.vitorpamplona.amethyst.ui.note.creators.userSuggestions
 
+import androidx.compose.foundation.text.input.TextFieldState
 import androidx.compose.runtime.Stable
 import androidx.compose.ui.text.TextRange
 import androidx.compose.ui.text.input.TextFieldValue
@@ -199,4 +200,17 @@ class UserSuggestionState(
             TextRange(lastWordStart + wordToInsert.length, lastWordStart + wordToInsert.length),
         )
     }
+
+    fun replaceCurrentWord(
+        state: TextFieldState,
+        word: String,
+        item: User,
+    ) {
+        val wordToInsert = "@${item.pubkeyNpub()}"
+        state.edit {
+            val lastWordStart = selection.end - word.length
+            replace(lastWordStart, selection.end, wordToInsert)
+            selection = TextRange(lastWordStart + wordToInsert.length, lastWordStart + wordToInsert.length)
+        }
+    }
 }

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/nip22Comments/CommentPostViewModel.kt

@@ -21,12 +21,14 @@
 package com.vitorpamplona.amethyst.ui.note.nip22Comments
 
 import android.content.Context
+import androidx.compose.foundation.text.input.TextFieldState
+import androidx.compose.foundation.text.input.setTextAndPlaceCursorAtEnd
 import androidx.compose.runtime.Stable
+import androidx.compose.ui.text.input.TextFieldValue
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableLongStateOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
-import androidx.compose.ui.text.input.TextFieldValue
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import com.vitorpamplona.amethyst.Amethyst
@@ -147,7 +149,7 @@ open class CommentPostViewModel :
 
     var notifying by mutableStateOf<List<User>?>(null)
 
-    override var message by mutableStateOf(TextFieldValue(""))
+    override val message = TextFieldState()
 
     val urlPreviews = PreviewState()
 
@@ -242,7 +244,7 @@ open class CommentPostViewModel :
     }
 
     open fun quote(quote: Note) {
-        message = TextFieldValue(message.text + "\nnostr:${quote.toNEvent()}")
+        message.setTextAndPlaceCursorAtEnd(message.text.toString() + "\nnostr:${quote.toNEvent()}")
 
         quote.author?.let { quotedUser ->
             if (quotedUser.pubkeyHex != accountViewModel.userProfile().pubkeyHex) {
@@ -262,7 +264,7 @@ open class CommentPostViewModel :
             wantsForwardZapTo = true
         }
 
-        urlPreviews.update(message)
+        urlPreviews.update(message.text.toString())
     }
 
     private fun loadFromDraft(draft: Note) {
@@ -322,11 +324,11 @@ open class CommentPostViewModel :
             wantsForwardZapTo = true
         }
 
-        message = TextFieldValue(draftEvent.content)
+        message.setTextAndPlaceCursorAtEnd(draftEvent.content)
 
         iMetaAttachments.addAll(draftEvent.imetas())
 
-        urlPreviews.update(message)
+        urlPreviews.update(message.text.toString())
     }
 
     suspend fun sendPostSync() {
@@ -359,7 +361,7 @@ open class CommentPostViewModel :
     }
 
     suspend fun sendDraftSync() {
-        if (message.text.isBlank()) {
+        if (message.text.toString().isBlank()) {
             accountViewModel.account.deleteDraftIgnoreErrors(draftTag.current)
         } else {
             val attachments = mutableSetOf<Event>()
@@ -376,7 +378,7 @@ open class CommentPostViewModel :
     private suspend fun createTemplate(): EventTemplate<out Event>? {
         val tagger =
             NewMessageTagger(
-                message = message.text,
+                message = message.text.toString(),
                 dao = accountViewModel,
             )
         tagger.run()
@@ -525,8 +527,8 @@ open class CommentPostViewModel :
                         val note = nip95.let { it1 -> account.consumeNip95(it1.first, it1.second) }
 
                         note?.let {
-                            message = message.insertUrlAtCursor("nostr:" + it.toNEvent())
+                            message.insertUrlAtCursor("nostr:" + it.toNEvent())
-                            urlPreviews.update(message)
+                            urlPreviews.update(message.text.toString())
                         }
                     } else if (state.result is UploadOrchestrator.OrchestratorResult.ServerResult) {
                         val iMeta =
@@ -549,8 +551,8 @@ open class CommentPostViewModel :
 
                         iMetaAttachments.replace(iMeta.url, iMeta)
 
-                        message = message.insertUrlAtCursor(state.result.url)
+                        message.insertUrlAtCursor(state.result.url)
-                        urlPreviews.update(message)
+                        urlPreviews.update(message.text.toString())
                     }
                 }
 
@@ -576,7 +578,7 @@ open class CommentPostViewModel :
     open fun cancel() {
         draftTag.rotate()
 
-        message = TextFieldValue("")
+        message.setTextAndPlaceCursorAtEnd("")
 
         replyingTo = null
         externalIdentity = null
@@ -618,9 +620,8 @@ open class CommentPostViewModel :
         notifying = notifying?.filter { it != userToRemove }
     }
 
-    override fun updateMessage(newMessage: TextFieldValue) {
+    override fun onMessageChanged() {
-        message = newMessage
+        urlPreviews.update(message.text.toString())
-        urlPreviews.update(message)
 
         if (message.selection.collapsed) {
             val lastWord = message.currentWord()
@@ -651,8 +652,8 @@ open class CommentPostViewModel :
         userSuggestions?.let { userSuggestions ->
             if (userSuggestionsMainMessage == UserSuggestionAnchor.MAIN_MESSAGE) {
                 val lastWord = message.currentWord()
-                message = userSuggestions.replaceCurrentWord(message, lastWord, item)
+                userSuggestions.replaceCurrentWord(message, lastWord, item)
-                urlPreviews.update(message)
+                urlPreviews.update(message.text.toString())
             } else if (userSuggestionsMainMessage == UserSuggestionAnchor.FORWARD_ZAPS) {
                 forwardZapTo.value.addItem(item)
                 forwardZapToEditting.value = TextFieldValue("")
@@ -668,8 +669,8 @@ open class CommentPostViewModel :
     open fun autocompleteWithEmoji(item: EmojiPackState.EmojiMedia) {
         val wordToInsert = ":${item.code}:"
 
-        message = message.replaceCurrentWord(wordToInsert)
+        message.replaceCurrentWord(wordToInsert)
-        urlPreviews.update(message)
+        urlPreviews.update(message.text.toString())
 
         emojiSuggestions?.reset()
 
@@ -685,8 +686,8 @@ open class CommentPostViewModel :
             }
         }
 
-        message = message.replaceCurrentWord(wordToInsert)
+        message.replaceCurrentWord(wordToInsert)
-        urlPreviews.update(message)
+        urlPreviews.update(message.text.toString())
 
         emojiSuggestions?.reset()
 
@@ -694,14 +695,14 @@ open class CommentPostViewModel :
     }
 
     fun canPost(): Boolean =
-        message.text.isNotBlank() &&
+        message.text.toString().isNotBlank() &&
             !mediaUploadTracker.isUploading &&
             !wantsInvoice &&
             (!wantsZapraiser || zapRaiserAmount.value != null) &&
             multiOrchestrator == null
 
     fun insertAtCursor(newElement: String) {
-        message = message.insertUrlAtCursor(newElement)
+        message.insertUrlAtCursor(newElement)
     }
 
     fun selectImage(uris: ImmutableList<SelectedMedia>) {
@@ -718,7 +719,7 @@ open class CommentPostViewModel :
     override fun updateZapFromText() {
         viewModelScope.launch(Dispatchers.IO) {
             val tagger =
-                NewMessageTagger(message.text, emptyList(), emptyList(), accountViewModel)
+                NewMessageTagger(message.text.toString(), emptyList(), emptyList(), accountViewModel)
             tagger.run()
             tagger.pTags?.forEach { taggedUser ->
                 if (!forwardZapTo.value.items.any { it.key == taggedUser }) {

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/nip22Comments/GenericCommentPostScreen.kt

@@ -46,7 +46,7 @@ import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.ui.Alignment.Companion.CenterVertically
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
-import androidx.compose.ui.text.input.TextFieldValue
+import androidx.compose.foundation.text.input.setTextAndPlaceCursorAtEnd
 import androidx.compose.ui.unit.dp
 import androidx.core.net.toUri
 import androidx.lifecycle.viewmodel.compose.viewModel
@@ -125,7 +125,8 @@ fun ReplyCommentPostScreen(
             postViewModel.quote(it)
         }
         message?.ifBlank { null }?.let {
-            postViewModel.updateMessage(TextFieldValue(it))
+            postViewModel.message.setTextAndPlaceCursorAtEnd(it)
+            postViewModel.onMessageChanged()
         }
         attachment?.ifBlank { null }?.toUri()?.let {
             withContext(Dispatchers.IO) {

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/privateDM/ChatroomView.kt

@@ -29,7 +29,7 @@ import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.text.input.TextFieldValue
+import androidx.compose.foundation.text.input.setTextAndPlaceCursorAtEnd
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.viewmodel.compose.viewModel
 import com.vitorpamplona.amethyst.service.relayClient.reqCommand.event.EventFinderFilterAssemblerSubscription
@@ -109,7 +109,8 @@ fun ChatroomView(
 
     if (draftMessage != null) {
         LaunchedEffect(key1 = draftMessage) {
-            newPostModel.updateMessage(TextFieldValue(draftMessage))
+            newPostModel.message.setTextAndPlaceCursorAtEnd(draftMessage)
+            newPostModel.onMessageChanged()
         }
     }
 

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/privateDM/send/ChatNewMessageViewModel.kt

@@ -26,6 +26,7 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableLongStateOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
+import androidx.compose.foundation.text.input.TextFieldState
 import androidx.compose.ui.text.input.TextFieldValue
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
@@ -204,7 +205,7 @@ class ChatNewMessageViewModel :
 
     var uploadsWaitingToBeSent by mutableStateOf<List<SuccessfulUploads>>(emptyList())
 
-    override var message by mutableStateOf(TextFieldValue(""))
+    override val message = TextFieldState()
 
     val urlPreviews = PreviewState()
 
@@ -216,8 +217,8 @@ class ChatNewMessageViewModel :
 
     var emojiSuggestions: EmojiSuggestionState? = null
 
-    var toUsers by mutableStateOf(TextFieldValue(""))
+    val toUsers = TextFieldState()
-    var subject by mutableStateOf(TextFieldValue(""))
+    val subject = TextFieldState()
 
     // Invoices
     var canAddInvoice by mutableStateOf(false)
@@ -274,10 +275,9 @@ class ChatNewMessageViewModel :
 
     fun load(room: ChatroomKey) {
         this.room.tryEmit(room)
-        this.toUsers =
+        this.toUsers.setTextAndPlaceCursorAtEnd(
-            TextFieldValue(
+            room.users.mapNotNull { runCatching { Hex.decode(it).toNpub() }.getOrNull() }.joinToString(", ") { "@$it" },
-                room.users.mapNotNull { runCatching { Hex.decode(it).toNpub() }.getOrNull() }.joinToString(", ") { "@$it" },
+        )
-            )
     }
 
     fun reply(replyNote: Note) {
@@ -291,8 +291,8 @@ class ChatNewMessageViewModel :
     }
 
     fun quote(quote: Note) {
-        message = TextFieldValue(message.text + "\nnostr:${quote.toNEvent()}")
+        message.setTextAndPlaceCursorAtEnd(message.text.toString() + "\nnostr:${quote.toNEvent()}")
-        urlPreviews.update(message)
+        urlPreviews.update(message.text.toString())
 
         // creates a split with that author.
         val quotedAuthor = quote.author ?: return
@@ -372,14 +372,13 @@ class ChatNewMessageViewModel :
         }
 
         draftEvent.subject()?.let {
-            subject = TextFieldValue()
+            subject.setTextAndPlaceCursorAtEnd("")
         }
 
         if (draftEvent is NIP17Group) {
-            toUsers =
+            toUsers.setTextAndPlaceCursorAtEnd(
-                TextFieldValue(
+                draftEvent.groupMembers().mapNotNull { runCatching { Hex.decode(it).toNpub() }.getOrNull() }.joinToString(", ") { "@$it" },
-                    draftEvent.groupMembers().mapNotNull { runCatching { Hex.decode(it).toNpub() }.getOrNull() }.joinToString(", ") { "@$it" },
+            )
-                )
 
             val replyId =
                 when (draftEvent) {
@@ -393,7 +392,7 @@ class ChatNewMessageViewModel :
             }
         } else if (draftEvent is PrivateDmEvent) {
             val recipientNPub = draftEvent.verifiedRecipientPubKey()?.let { Hex.decode(it).toNpub() }
-            toUsers = TextFieldValue("@$recipientNPub")
+            toUsers.setTextAndPlaceCursorAtEnd("@$recipientNPub")
 
             val replyId = draftEvent.replyTo()
             if (replyId != null) {
@@ -401,13 +400,14 @@ class ChatNewMessageViewModel :
             }
         }
 
-        message =
+        val draftText =
             if (draftEvent is PrivateDmEvent) {
-                TextFieldValue(accountViewModel.account.privateDMDecryptionCache.cachedDM(draftEvent) ?: "")
+                accountViewModel.account.privateDMDecryptionCache.cachedDM(draftEvent) ?: ""
             } else {
-                TextFieldValue(draftEvent.content)
+                draftEvent.content
             }
-        urlPreviews.update(message)
+        message.setTextAndPlaceCursorAtEnd(draftText)
+        urlPreviews.update(message.text.toString())
 
         iMetaAttachments.addAll(draftEvent.imetas())
     }
@@ -422,7 +422,7 @@ class ChatNewMessageViewModel :
     }
 
     suspend fun sendDraftSync() {
-        if (message.text.isBlank()) {
+        if (message.text.toString().isBlank()) {
             account.deleteDraftIgnoreErrors(draftTag.current)
         } else {
             innerSendPost(draftTag.current)
@@ -564,11 +564,12 @@ class ChatNewMessageViewModel :
     private suspend fun innerSendPost(draftTag: String?) {
         val room = room.value ?: return
 
-        val urls = findURLs(message.text)
+        val messageText = message.text.toString()
+        val urls = findURLs(messageText)
         val usedAttachments = iMetaAttachments.filterIsIn(urls.toSet())
-        val emojis = findEmoji(message.text, accountViewModel.account.emoji.myEmojis.value)
+        val emojis = findEmoji(messageText, accountViewModel.account.emoji.myEmojis.value)
         val geoHash = if (wantsToAddGeoHash) (location?.value as? LocationState.LocationResult.Success)?.geoHash?.toString() else null
-        val message = message.text
+        val message = messageText
 
         val contentWarningReason = if (wantsToMarkAsSensitive) contentWarningDescription else null
         val localExpirationDate = if (wantsExpirationDate) expirationDate else null
@@ -634,8 +635,8 @@ class ChatNewMessageViewModel :
     fun cancel() {
         draftTag.rotate()
 
-        message = TextFieldValue("")
+        message.setTextAndPlaceCursorAtEnd("")
-        subject = TextFieldValue("")
+        subject.setTextAndPlaceCursorAtEnd("")
 
         replyTo.value = null
 
@@ -668,15 +669,15 @@ class ChatNewMessageViewModel :
     }
 
     fun addToMessage(it: String) {
-        updateMessage(TextFieldValue(message.text + " " + it))
+        message.setTextAndPlaceCursorAtEnd(message.text.toString() + " " + it)
+        onMessageChanged()
     }
 
-    override fun updateMessage(newMessage: TextFieldValue) {
+    override fun onMessageChanged() {
-        message = newMessage
+        urlPreviews.update(message.text.toString())
-        urlPreviews.update(newMessage)
 
         if (message.selection.collapsed) {
-            val lastWord = newMessage.currentWord()
+            val lastWord = message.currentWord()
             if (lastWord.startsWith("@")) {
                 userSuggestionsMainMessage = UserSuggestionAnchor.MAIN_MESSAGE
                 userSuggestions?.processCurrentWord(lastWord)
@@ -690,11 +691,9 @@ class ChatNewMessageViewModel :
         draftTag.newVersion()
     }
 
-    fun updateToUsers(newToUsersValue: TextFieldValue) {
+    fun onToUsersChanged() {
-        toUsers = newToUsersValue
+        if (toUsers.selection.collapsed) {
-
+            val lastWord = toUsers.currentWord()
-        if (newToUsersValue.selection.collapsed) {
-            val lastWord = newToUsersValue.currentWord()
             userSuggestionsMainMessage = UserSuggestionAnchor.TO_USERS
             userSuggestions?.processCurrentWord(lastWord)
         }
@@ -707,7 +706,7 @@ class ChatNewMessageViewModel :
     fun updateRoomFromUsersInput() {
         viewModelScope.launch(Dispatchers.IO) {
             delay(300)
-            val toUsersTagger = NewMessageTagger(toUsers.text, null, null, accountViewModel)
+            val toUsersTagger = NewMessageTagger(toUsers.text.toString(), null, null, accountViewModel)
             toUsersTagger.run()
 
             val users = toUsersTagger.pTags?.mapTo(mutableSetOf()) { it.pubkeyHex }
@@ -721,8 +720,7 @@ class ChatNewMessageViewModel :
         }
     }
 
-    fun updateSubject(it: TextFieldValue) {
+    fun onSubjectChanged() {
-        subject = it
         draftTag.newVersion()
     }
 
@@ -739,14 +737,14 @@ class ChatNewMessageViewModel :
         userSuggestions?.let { userSuggestions ->
             if (userSuggestionsMainMessage == UserSuggestionAnchor.MAIN_MESSAGE) {
                 val lastWord = message.currentWord()
-                message = userSuggestions.replaceCurrentWord(message, lastWord, item)
+                userSuggestions.replaceCurrentWord(message, lastWord, item)
-                urlPreviews.update(message)
+                urlPreviews.update(message.text.toString())
             } else if (userSuggestionsMainMessage == UserSuggestionAnchor.FORWARD_ZAPS) {
                 forwardZapTo.value.addItem(item)
                 forwardZapToEditting.value = TextFieldValue("")
             } else if (userSuggestionsMainMessage == UserSuggestionAnchor.TO_USERS) {
                 val lastWord = toUsers.currentWord()
-                toUsers = userSuggestions.replaceCurrentWord(toUsers, lastWord, item)
+                userSuggestions.replaceCurrentWord(toUsers, lastWord, item)
                 updateRoomFromUsersInput()
             }
 
@@ -760,8 +758,8 @@ class ChatNewMessageViewModel :
     fun autocompleteWithEmoji(item: EmojiPackState.EmojiMedia) {
         val wordToInsert = ":${item.code}:"
 
-        message = message.replaceCurrentWord(wordToInsert)
+        message.replaceCurrentWord(wordToInsert)
-        urlPreviews.update(message)
+        urlPreviews.update(message.text.toString())
 
         emojiSuggestions?.reset()
 
@@ -777,8 +775,8 @@ class ChatNewMessageViewModel :
             }
         }
 
-        message = message.replaceCurrentWord(wordToInsert)
+        message.replaceCurrentWord(wordToInsert)
-        urlPreviews.update(message)
+        urlPreviews.update(message.text.toString())
 
         emojiSuggestions?.reset()
 
@@ -795,8 +793,8 @@ class ChatNewMessageViewModel :
             recipientsMissingDmRelays.value.isEmpty()
 
     fun insertAtCursor(newElement: String) {
-        message = message.insertUrlAtCursor(newElement)
+        message.insertUrlAtCursor(newElement)
-        urlPreviews.update(message)
+        urlPreviews.update(message.text.toString())
     }
 
     override fun onCleared() {
@@ -817,7 +815,7 @@ class ChatNewMessageViewModel :
 
     override fun updateZapFromText() {
         viewModelScope.launch(Dispatchers.IO) {
-            val tagger = NewMessageTagger(message.text, emptyList(), emptyList(), accountViewModel)
+            val tagger = NewMessageTagger(message.text.toString(), emptyList(), emptyList(), accountViewModel)
             tagger.run()
             tagger.pTags?.forEach { taggedUser ->
                 if (!forwardZapTo.value.items.any { it.key == taggedUser }) {

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/privateDM/send/NewGroupDMScreen.kt

@@ -67,7 +67,7 @@ import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.LocalSoftwareKeyboardController
 import androidx.compose.ui.text.font.FontWeight
-import androidx.compose.ui.text.input.TextFieldValue
+import androidx.compose.foundation.text.input.setTextAndPlaceCursorAtEnd
 import androidx.compose.ui.unit.dp
 import androidx.core.net.toUri
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
@@ -80,7 +80,7 @@ import com.vitorpamplona.amethyst.commons.richtext.EncryptedMediaUrlVideo
 import com.vitorpamplona.amethyst.commons.richtext.MediaUrlImage
 import com.vitorpamplona.amethyst.commons.richtext.MediaUrlVideo
 import com.vitorpamplona.amethyst.commons.richtext.RichTextParser
-import com.vitorpamplona.amethyst.ui.actions.UrlUserTagTransformation
+import com.vitorpamplona.amethyst.ui.actions.UrlUserTagOutputTransformation
 import com.vitorpamplona.amethyst.ui.actions.uploads.SelectFromFiles
 import com.vitorpamplona.amethyst.ui.actions.uploads.SelectFromGallery
 import com.vitorpamplona.amethyst.ui.actions.uploads.SelectedMedia
@@ -158,7 +158,8 @@ fun NewGroupDMScreen(
 
     LaunchedEffect(postViewModel, accountViewModel) {
         message?.ifBlank { null }?.let {
-            postViewModel.updateMessage(TextFieldValue(it))
+            postViewModel.message.setTextAndPlaceCursorAtEnd(it)
+            postViewModel.onMessageChanged()
         }
         attachment?.let {
             withContext(Dispatchers.IO) {
@@ -530,8 +531,8 @@ fun SendDirectMessageTo(
             )
 
             ThinPaddingTextField(
-                value = postViewModel.toUsers,
+                state = postViewModel.toUsers,
-                onValueChange = postViewModel::updateToUsers,
+                onTextChanged = postViewModel::onToUsersChanged,
                 modifier =
                     Modifier
                         .weight(1f)
@@ -547,8 +548,8 @@ fun SendDirectMessageTo(
                         color = MaterialTheme.colorScheme.placeholderText,
                     )
                 },
-                visualTransformation =
+                outputTransformation =
-                    UrlUserTagTransformation(
+                    UrlUserTagOutputTransformation(
                         MaterialTheme.colorScheme.primary,
                     ),
                 colors =
@@ -572,8 +573,8 @@ fun SendDirectMessageTo(
             )
 
             ThinPaddingTextField(
-                value = postViewModel.subject,
+                state = postViewModel.subject,
-                onValueChange = { postViewModel.updateSubject(it) },
+                onTextChanged = { postViewModel.onSubjectChanged() },
                 modifier = Modifier.fillMaxWidth(),
                 placeholder = {
                     Text(
@@ -581,8 +582,8 @@ fun SendDirectMessageTo(
                         color = MaterialTheme.colorScheme.placeholderText,
                     )
                 },
-                visualTransformation =
+                outputTransformation =
-                    UrlUserTagTransformation(
+                    UrlUserTagOutputTransformation(
                         MaterialTheme.colorScheme.primary,
                     ),
                 colors =

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/privateDM/send/PrivateMessageEditFieldRow.kt

@@ -55,7 +55,7 @@ import com.vitorpamplona.amethyst.R
 import com.vitorpamplona.amethyst.model.LocalCache
 import com.vitorpamplona.amethyst.model.User
 import com.vitorpamplona.amethyst.ui.actions.StrippingFailureDialog
-import com.vitorpamplona.amethyst.ui.actions.UrlUserTagTransformation
+import com.vitorpamplona.amethyst.ui.actions.UrlUserTagOutputTransformation
 import com.vitorpamplona.amethyst.ui.actions.uploads.SelectFromGallery
 import com.vitorpamplona.amethyst.ui.components.ThinPaddingTextField
 import com.vitorpamplona.amethyst.ui.navigation.navs.EmptyNav
@@ -202,8 +202,8 @@ fun EditField(
     accountViewModel: AccountViewModel,
 ) {
     ThinPaddingTextField(
-        value = channelScreenModel.message,
+        state = channelScreenModel.message,
-        onValueChange = { channelScreenModel.updateMessage(it) },
+        onTextChanged = { channelScreenModel.onMessageChanged() },
         keyboardOptions = PostKeyboard,
         shape = EditFieldBorder,
         modifier = Modifier.fillMaxWidth(),
@@ -232,7 +232,7 @@ fun EditField(
                 focusedIndicatorColor = Color.Transparent,
                 unfocusedIndicatorColor = Color.Transparent,
             ),
-        visualTransformation = UrlUserTagTransformation(MaterialTheme.colorScheme.primary),
+        outputTransformation = UrlUserTagOutputTransformation(MaterialTheme.colorScheme.primary),
     )
 }
 

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/publicChannels/send/ChannelNewMessageViewModel.kt

@@ -26,6 +26,7 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableLongStateOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
+import androidx.compose.foundation.text.input.TextFieldState
 import androidx.compose.ui.text.input.TextFieldValue
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
@@ -137,7 +138,7 @@ open class ChannelNewMessageViewModel :
     val iMetaAttachments = IMetaAttachments()
     var nip95attachments by mutableStateOf<List<Pair<FileStorageEvent, FileStorageHeaderEvent>>>(emptyList())
 
-    var message by mutableStateOf(TextFieldValue(""))
+    val message = TextFieldState()
     var urlPreview by mutableStateOf<String?>(null)
     val isUploadingImage: Boolean get() = uploadState?.isUploadingImage ?: false
     val isUploadingFile: Boolean get() = uploadState?.isUploadingFile ?: false
@@ -274,7 +275,7 @@ open class ChannelNewMessageViewModel :
             }
         }
 
-        message = TextFieldValue(draftEvent.content)
+        message.setTextAndPlaceCursorAtEnd(draftEvent.content)
 
         iMetaAttachments.addAll(draftEvent.imetas())
 
@@ -302,7 +303,7 @@ open class ChannelNewMessageViewModel :
     }
 
     suspend fun sendDraftSync() {
-        if (message.text.isBlank()) {
+        if (message.text.toString().isBlank()) {
             account.deleteDraftIgnoreErrors(draftTag.current)
         } else {
             val attachments = mutableSetOf<Event>()
@@ -365,14 +366,14 @@ open class ChannelNewMessageViewModel :
                         val note = nip95.let { it1 -> account.consumeNip95(it1.first, it1.second) }
 
                         note?.let {
-                            message = message.insertUrlAtCursor(it.toNostrUri())
+                            message.insertUrlAtCursor(it.toNostrUri())
                         }
 
                         urlPreview = findUrlInMessage()
                     } else if (upload.result is UploadOrchestrator.OrchestratorResult.ServerResult) {
                         iMetaAttachments.add(upload.result, uploadState.caption, uploadState.contentWarningReason)
 
-                        message = message.insertUrlAtCursor(upload.result.url)
+                        message.insertUrlAtCursor(upload.result.url)
                         urlPreview = findUrlInMessage()
                     }
                 }
@@ -392,18 +393,19 @@ open class ChannelNewMessageViewModel :
 
     private suspend fun createTemplate(): EventTemplate<out Event>? {
         val channel = channel ?: return null
+        val messageText = message.text.toString()
         val tagger =
             NewMessageTagger(
-                message = message.text,
+                message = messageText,
                 pTags = listOfNotNull(replyTo.value?.author),
                 eTags = listOfNotNull(replyTo.value),
                 dao = accountViewModel,
             )
         tagger.run()
 
-        val urls = findURLs(message.text)
+        val urls = findURLs(messageText)
         val usedAttachments = iMetaAttachments.filterIsIn(urls.toSet())
-        val emojis = findEmoji(message.text, accountViewModel.account.emoji.myEmojis.value)
+        val emojis = findEmoji(messageText, accountViewModel.account.emoji.myEmojis.value)
 
         val channelRelays = channel.relays()
         val geoHash = if (wantsToAddGeoHash) (location?.value as? LocationState.LocationResult.Success)?.geoHash?.toString() else null
@@ -533,7 +535,7 @@ open class ChannelNewMessageViewModel :
     open fun cancel() {
         draftTag.rotate()
 
-        message = TextFieldValue("")
+        message.setTextAndPlaceCursorAtEnd("")
 
         replyTo.value = null
 
@@ -561,18 +563,18 @@ open class ChannelNewMessageViewModel :
         emojiSuggestions?.reset()
     }
 
-    open fun findUrlInMessage(): String? = UrlParser().parseValidUrls(message.text).withScheme.firstOrNull()
+    open fun findUrlInMessage(): String? = UrlParser().parseValidUrls(message.text.toString()).withScheme.firstOrNull()
 
     open fun addToMessage(it: String) {
-        updateMessage(TextFieldValue(message.text + " " + it))
+        message.setTextAndPlaceCursorAtEnd(message.text.toString() + " " + it)
+        onMessageChanged()
     }
 
-    open fun updateMessage(newMessage: TextFieldValue) {
+    open fun onMessageChanged() {
-        message = newMessage
         urlPreview = findUrlInMessage()
 
-        if (newMessage.selection.collapsed) {
+        if (message.selection.collapsed) {
-            val lastWord = newMessage.currentWord()
+            val lastWord = message.currentWord()
             if (lastWord.startsWith("@")) {
                 userSuggestionsMainMessage = UserSuggestionAnchor.MAIN_MESSAGE
                 userSuggestions?.processCurrentWord(lastWord)
@@ -600,7 +602,7 @@ open class ChannelNewMessageViewModel :
         userSuggestions?.let {
             if (userSuggestionsMainMessage == UserSuggestionAnchor.MAIN_MESSAGE) {
                 val lastWord = message.currentWord()
-                message = it.replaceCurrentWord(message, lastWord, item)
+                it.replaceCurrentWord(message, lastWord, item)
             } else if (userSuggestionsMainMessage == UserSuggestionAnchor.FORWARD_ZAPS) {
                 forwardZapTo.addItem(item)
                 forwardZapToEditting = TextFieldValue("")
@@ -615,7 +617,7 @@ open class ChannelNewMessageViewModel :
 
     open fun autocompleteWithEmoji(item: EmojiPackState.EmojiMedia) {
         val wordToInsert = ":${item.code}:"
-        message = message.replaceCurrentWord(wordToInsert)
+        message.replaceCurrentWord(wordToInsert)
 
         emojiSuggestions?.reset()
 
@@ -631,7 +633,7 @@ open class ChannelNewMessageViewModel :
             }
         }
 
-        message = message.replaceCurrentWord(wordToInsert)
+        message.replaceCurrentWord(wordToInsert)
 
         emojiSuggestions?.reset()
 
@@ -648,7 +650,7 @@ open class ChannelNewMessageViewModel :
             uploadState?.multiOrchestrator == null
 
     fun insertAtCursor(newElement: String) {
-        message = message.insertUrlAtCursor(newElement)
+        message.insertUrlAtCursor(newElement)
     }
 
     override fun locationManager(): LocationState = Amethyst.instance.locationManager
@@ -675,7 +677,7 @@ open class ChannelNewMessageViewModel :
 
     fun updateZapFromText() {
         viewModelScope.launch(Dispatchers.IO) {
-            val tagger = NewMessageTagger(message.text, emptyList(), emptyList(), accountViewModel)
+            val tagger = NewMessageTagger(message.text.toString(), emptyList(), emptyList(), accountViewModel)
             tagger.run()
             tagger.pTags?.forEach { taggedUser ->
                 if (!forwardZapTo.items.any { it.key == taggedUser }) {

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/publicChannels/send/EditFieldRow.kt

@@ -38,7 +38,7 @@ import androidx.compose.ui.text.style.TextDirection
 import androidx.compose.ui.unit.dp
 import com.vitorpamplona.amethyst.R
 import com.vitorpamplona.amethyst.ui.actions.StrippingFailureDialog
-import com.vitorpamplona.amethyst.ui.actions.UrlUserTagTransformation
+import com.vitorpamplona.amethyst.ui.actions.UrlUserTagOutputTransformation
 import com.vitorpamplona.amethyst.ui.actions.uploads.SelectFromGallery
 import com.vitorpamplona.amethyst.ui.components.ThinPaddingTextField
 import com.vitorpamplona.amethyst.ui.navigation.navs.INav
@@ -114,8 +114,8 @@ fun EditFieldRow(
         }
 
         ThinPaddingTextField(
-            value = channelScreenModel.message,
+            state = channelScreenModel.message,
-            onValueChange = { channelScreenModel.updateMessage(it) },
+            onTextChanged = { channelScreenModel.onMessageChanged() },
             keyboardOptions =
                 KeyboardOptions.Default.copy(
                     capitalization = KeyboardCapitalization.Sentences,
@@ -151,7 +151,7 @@ fun EditFieldRow(
                     focusedIndicatorColor = Color.Transparent,
                     unfocusedIndicatorColor = Color.Transparent,
                 ),
-            visualTransformation = UrlUserTagTransformation(MaterialTheme.colorScheme.primary),
+            outputTransformation = UrlUserTagOutputTransformation(MaterialTheme.colorScheme.primary),
         )
     }
 }

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/discover/nip23LongForm/LongFormPostViewModel.kt

@@ -23,6 +23,8 @@ package com.vitorpamplona.amethyst.ui.screen.loggedIn.discover.nip23LongForm
 import android.R.attr.version
 import android.content.Context
 import androidx.compose.runtime.Stable
+import androidx.compose.foundation.text.input.TextFieldState
+import androidx.compose.foundation.text.input.setTextAndPlaceCursorAtEnd
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableLongStateOf
 import androidx.compose.runtime.mutableStateOf
@@ -148,7 +150,7 @@ class LongFormPostViewModel :
 
     var isUploadingCoverImage by mutableStateOf(false)
 
-    override var message by mutableStateOf(TextFieldValue(""))
+    override val message = TextFieldState()
 
     var showPreview by mutableStateOf(false)
 
@@ -242,7 +244,7 @@ class LongFormPostViewModel :
                 summary = TextFieldValue(noteEvent.summary() ?: "")
                 publishedAt = noteEvent.publishedAt() ?: noteEvent.createdAt
                 coverImageUrl = noteEvent.image() ?: ""
-                message = TextFieldValue(noteEvent.content)
+                message.setTextAndPlaceCursorAtEnd(noteEvent.content)
                 existingDTag = noteEvent.dTag()
             }
 
@@ -266,7 +268,7 @@ class LongFormPostViewModel :
         summary = TextFieldValue(draftEvent.summary() ?: "")
         publishedAt = draftEvent.publishedAt() ?: draftEvent.createdAt
         coverImageUrl = draftEvent.image() ?: ""
-        message = TextFieldValue(draftEvent.content)
+        message.setTextAndPlaceCursorAtEnd(draftEvent.content)
         existingDTag = draftEvent.dTag()
 
         canAddInvoice = accountViewModel.userProfile().lnAddress() != null
@@ -336,7 +338,7 @@ class LongFormPostViewModel :
     }
 
     suspend fun sendDraftSync() {
-        if (message.text.isBlank() && title.text.isBlank()) {
+        if (message.text.toString().isBlank() && title.text.isBlank()) {
             accountViewModel.account.deleteDraftIgnoreErrors(draftTag.current)
         } else {
             val template = createTemplate() ?: return
@@ -350,7 +352,7 @@ class LongFormPostViewModel :
 
         val tagger =
             NewMessageTagger(
-                message.text,
+                message.text.toString(),
                 null,
                 null,
                 accountViewModel,
@@ -540,7 +542,7 @@ class LongFormPostViewModel :
                         iMetaAttachments.replace(iMeta.url, iMeta)
 
                         val markdownImage = "![${alt ?: ""}](${state.result.url})"
-                        message = message.insertUrlAtCursor(markdownImage)
+                        message.insertUrlAtCursor(markdownImage)
                     }
                 }
 
@@ -560,7 +562,7 @@ class LongFormPostViewModel :
         title = TextFieldValue("")
         summary = TextFieldValue("")
         coverImageUrl = ""
-        message = TextFieldValue("")
+        message.setTextAndPlaceCursorAtEnd("")
         publishedAt = TimeUtils.now()
         showPreview = false
 
@@ -595,11 +597,9 @@ class LongFormPostViewModel :
         this.multiOrchestrator?.remove(selected)
     }
 
-    override fun updateMessage(newMessage: TextFieldValue) {
+    override fun onMessageChanged() {
-        message = newMessage
-
         if (message.selection.collapsed) {
-            val lastWord = newMessage.currentWord()
+            val lastWord = message.currentWord()
             if (lastWord.startsWith("@")) {
                 userSuggestionsMainMessage = UserSuggestionAnchor.MAIN_MESSAGE
                 userSuggestions?.processCurrentWord(lastWord)
@@ -627,7 +627,7 @@ class LongFormPostViewModel :
         userSuggestions?.let { userSuggestions ->
             if (userSuggestionsMainMessage == UserSuggestionAnchor.MAIN_MESSAGE) {
                 val lastWord = message.currentWord()
-                message = userSuggestions.replaceCurrentWord(message, lastWord, item)
+                userSuggestions.replaceCurrentWord(message, lastWord, item)
             } else if (userSuggestionsMainMessage == UserSuggestionAnchor.FORWARD_ZAPS) {
                 forwardZapTo.value.addItem(item)
                 forwardZapToEditting.value = TextFieldValue("")
@@ -642,7 +642,7 @@ class LongFormPostViewModel :
 
     fun autocompleteWithEmoji(item: EmojiMedia) {
         val wordToInsert = ":${item.code}:"
-        message = message.replaceCurrentWord(wordToInsert)
+        message.replaceCurrentWord(wordToInsert)
         emojiSuggestions?.reset()
         draftTag.newVersion()
     }
@@ -656,21 +656,21 @@ class LongFormPostViewModel :
             }
         }
 
-        message = message.replaceCurrentWord(wordToInsert)
+        message.replaceCurrentWord(wordToInsert)
         emojiSuggestions?.reset()
         draftTag.newVersion()
     }
 
     fun canPost(): Boolean =
         title.text.isNotBlank() &&
-            message.text.isNotBlank() &&
+            message.text.toString().isNotBlank() &&
             !isUploadingImage &&
             !wantsInvoice &&
             (!wantsZapRaiser || zapRaiserAmount.value != null) &&
             multiOrchestrator == null
 
     fun insertAtCursor(newElement: String) {
-        message = message.insertUrlAtCursor(newElement)
+        message.insertUrlAtCursor(newElement)
     }
 
     fun selectImage(uris: ImmutableList<SelectedMedia>) {

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/discover/nip99Classifieds/NewProductScreen.kt

@@ -41,7 +41,7 @@ import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.ui.Alignment.Companion.CenterVertically
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
-import androidx.compose.ui.text.input.TextFieldValue
+import androidx.compose.foundation.text.input.setTextAndPlaceCursorAtEnd
 import androidx.compose.ui.unit.dp
 import androidx.core.net.toUri
 import androidx.lifecycle.viewmodel.compose.viewModel
@@ -112,7 +112,8 @@ fun NewProductScreen(
             postViewModel.quote(it)
         }
         message?.ifBlank { null }?.let {
-            postViewModel.updateMessage(TextFieldValue(it))
+            postViewModel.message.setTextAndPlaceCursorAtEnd(it)
+            postViewModel.onMessageChanged()
         }
         attachment?.ifBlank { null }?.toUri()?.let {
             withContext(Dispatchers.IO) {

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/discover/nip99Classifieds/NewProductViewModel.kt

@@ -26,6 +26,7 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableLongStateOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
+import androidx.compose.foundation.text.input.TextFieldState
 import androidx.compose.ui.text.input.TextFieldValue
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
@@ -131,7 +132,7 @@ open class NewProductViewModel :
     var productImages by mutableStateOf<List<ProductImageMeta>>(emptyList())
     val iMetaDescription = IMetaAttachments()
 
-    override var message by mutableStateOf(TextFieldValue(""))
+    override val message = TextFieldState()
 
     val urlPreviews = PreviewState()
 
@@ -151,10 +152,10 @@ open class NewProductViewModel :
     val strippingFailureConfirmation = SuspendableConfirmation()
 
     // Classifieds
-    var title by mutableStateOf(TextFieldValue(""))
+    val title = TextFieldState()
-    var price by mutableStateOf(TextFieldValue(""))
+    val price = TextFieldState()
-    var locationText by mutableStateOf(TextFieldValue(""))
+    val locationText = TextFieldState()
-    var category by mutableStateOf(TextFieldValue(""))
+    val category = TextFieldState()
     var condition by mutableStateOf(ConditionTag.CONDITION.USED_LIKE_NEW)
 
     // Invoices
@@ -226,7 +227,7 @@ open class NewProductViewModel :
     open fun quote(quote: Note) {
         val accountViewModel = accountViewModel
 
-        message = TextFieldValue(message.text + "\nnostr:${quote.toNEvent()}")
+        message.setTextAndPlaceCursorAtEnd(message.text.toString() + "\nnostr:${quote.toNEvent()}")
 
         quote.author?.let { quotedUser ->
             if (quotedUser.pubkeyHex != accountViewModel.userProfile().pubkeyHex) {
@@ -246,7 +247,7 @@ open class NewProductViewModel :
             wantsForwardZapTo = true
         }
 
-        urlPreviews.update(message)
+        urlPreviews.update(message.text.toString())
     }
 
     private fun loadFromDraft(draft: Note) {
@@ -284,10 +285,10 @@ open class NewProductViewModel :
             zapRaiserAmount.value = zapraiser
         }
 
-        title = TextFieldValue(draftEvent.title() ?: "")
+        title.setTextAndPlaceCursorAtEnd(draftEvent.title() ?: "")
-        price = TextFieldValue(draftEvent.price()?.amount ?: "")
+        price.setTextAndPlaceCursorAtEnd(draftEvent.price()?.amount ?: "")
-        category = TextFieldValue(draftEvent.categories().firstOrNull() ?: "")
+        category.setTextAndPlaceCursorAtEnd(draftEvent.categories().firstOrNull() ?: "")
-        locationText = TextFieldValue(draftEvent.location() ?: "")
+        locationText.setTextAndPlaceCursorAtEnd(draftEvent.location() ?: "")
         condition = draftEvent.conditionValid() ?: ConditionTag.CONDITION.USED_LIKE_NEW
 
         val imageSet = draftEvent.images().toMutableSet()
@@ -305,9 +306,9 @@ open class NewProductViewModel :
             productImages = productImages + ProductImageMeta(it)
         }
 
-        message = TextFieldValue(draftEvent.content)
+        message.setTextAndPlaceCursorAtEnd(draftEvent.content)
 
-        urlPreviews.update(message)
+        urlPreviews.update(message.text.toString())
     }
 
     suspend fun sendPostSync() {
@@ -323,7 +324,7 @@ open class NewProductViewModel :
     }
 
     suspend fun sendDraftSync() {
-        if (message.text.isBlank()) {
+        if (message.text.toString().isBlank()) {
             accountViewModel.account.deleteDraftIgnoreErrors(draftTag.current)
         } else {
             val template = createTemplate() ?: return
@@ -336,7 +337,7 @@ open class NewProductViewModel :
 
         val tagger =
             NewMessageTagger(
-                message = message.text,
+                message = message.text.toString(),
                 dao = accountViewModel,
             )
         tagger.run()
@@ -356,15 +357,15 @@ open class NewProductViewModel :
 
         val template =
             ClassifiedsEvent.build(
-                title.text,
+                title.text.toString(),
-                PriceTag(price.text, "SATS", null),
+                PriceTag(price.text.toString(), "SATS", null),
                 tagger.message,
-                locationText.text.ifBlank { null },
+                locationText.text.toString().ifBlank { null },
                 condition,
             ) {
                 productImages.forEach { image(it.url) }
 
-                hashtags(listOfNotNull(category.text.ifBlank { null }) + findHashtags(tagger.message))
+                hashtags(listOfNotNull(category.text.toString().ifBlank { null }) + findHashtags(tagger.message))
                 quotes(quotes)
 
                 geoHash?.let { geohash(it) }
@@ -438,8 +439,8 @@ open class NewProductViewModel :
                         } else {
                             iMetaDescription.add(it.result, alt, contentWarningReason)
 
-                            message = message.insertUrlAtCursor(it.result.url)
+                            message.insertUrlAtCursor(it.result.url)
-                            urlPreviews.update(message)
+                            urlPreviews.update(message.text.toString())
                         }
                     }
                 }
@@ -458,7 +459,7 @@ open class NewProductViewModel :
     open fun cancel() {
         draftTag.rotate()
 
-        message = TextFieldValue("")
+        message.setTextAndPlaceCursorAtEnd("")
 
         multiOrchestrator = null
         mediaUploadTracker.finishUpload()
@@ -468,10 +469,10 @@ open class NewProductViewModel :
         zapRaiserAmount.value = null
 
         condition = ConditionTag.CONDITION.USED_LIKE_NEW
-        locationText = TextFieldValue("")
+        locationText.setTextAndPlaceCursorAtEnd("")
-        title = TextFieldValue("")
+        title.setTextAndPlaceCursorAtEnd("")
-        category = TextFieldValue("")
+        category.setTextAndPlaceCursorAtEnd("")
-        price = TextFieldValue("")
+        price.setTextAndPlaceCursorAtEnd("")
 
         wantsForwardZapTo = false
         wantsToMarkAsSensitive = false
@@ -505,9 +506,8 @@ open class NewProductViewModel :
         this.multiOrchestrator?.remove(selected)
     }
 
-    override fun updateMessage(newMessage: TextFieldValue) {
+    override fun onMessageChanged() {
-        message = newMessage
+        urlPreviews.update(message.text.toString())
-        urlPreviews.update(message)
 
         if (message.selection.collapsed) {
             val lastWord = message.currentWord()
@@ -538,8 +538,8 @@ open class NewProductViewModel :
         userSuggestions?.let { userSuggestions ->
             if (userSuggestionsMainMessage == UserSuggestionAnchor.MAIN_MESSAGE) {
                 val lastWord = message.currentWord()
-                message = userSuggestions.replaceCurrentWord(message, lastWord, item)
+                userSuggestions.replaceCurrentWord(message, lastWord, item)
-                urlPreviews.update(message)
+                urlPreviews.update(message.text.toString())
             } else if (userSuggestionsMainMessage == UserSuggestionAnchor.FORWARD_ZAPS) {
                 forwardZapTo.value.addItem(item)
                 forwardZapToEditting.value = TextFieldValue("")
@@ -555,8 +555,8 @@ open class NewProductViewModel :
     open fun autocompleteWithEmoji(item: EmojiPackState.EmojiMedia) {
         val wordToInsert = ":${item.code}:"
 
-        message = message.replaceCurrentWord(wordToInsert)
+        message.replaceCurrentWord(wordToInsert)
-        urlPreviews.update(message)
+        urlPreviews.update(message.text.toString())
 
         emojiSuggestions?.reset()
 
@@ -572,8 +572,8 @@ open class NewProductViewModel :
             }
         }
 
-        message = message.replaceCurrentWord(wordToInsert)
+        message.replaceCurrentWord(wordToInsert)
-        urlPreviews.update(message)
+        urlPreviews.update(message.text.toString())
 
         emojiSuggestions?.reset()
 
@@ -591,7 +591,7 @@ open class NewProductViewModel :
             multiOrchestrator == null
 
     fun insertAtCursor(newElement: String) {
-        message = message.insertUrlAtCursor(newElement)
+        message.insertUrlAtCursor(newElement)
     }
 
     fun selectImage(uris: ImmutableList<SelectedMedia>) {
@@ -620,7 +620,7 @@ open class NewProductViewModel :
 
     override fun updateZapFromText() {
         viewModelScope.launch(Dispatchers.IO) {
-            val tagger = NewMessageTagger(message.text, emptyList(), emptyList(), accountViewModel)
+            val tagger = NewMessageTagger(message.text.toString(), emptyList(), emptyList(), accountViewModel)
             tagger.run()
             tagger.pTags?.forEach { taggedUser ->
                 if (!forwardZapTo.value.items.any { it.key == taggedUser }) {
@@ -648,19 +648,11 @@ open class NewProductViewModel :
         draftTag.newVersion()
     }
 
-    fun updateTitle(it: TextFieldValue) {
+    fun onTitleChanged() {
-        title = it
         draftTag.newVersion()
     }
 
-    fun updatePrice(it: TextFieldValue) {
+    fun onPriceChanged() {
-        runCatching {
-            if (it.text.isEmpty()) {
-                price = TextFieldValue("")
-            } else if (it.text.toLongOrNull() != null) {
-                price = it
-            }
-        }
         draftTag.newVersion()
     }
 
@@ -669,13 +661,12 @@ open class NewProductViewModel :
         draftTag.newVersion()
     }
 
-    fun updateCategory(value: TextFieldValue) {
+    fun updateCategory(text: String) {
-        category = value
+        category.setTextAndPlaceCursorAtEnd(text)
         draftTag.newVersion()
     }
 
-    fun updateLocation(it: TextFieldValue) {
+    fun onLocationChanged() {
-        locationText = it
         draftTag.newVersion()
     }
 

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/discover/nip99Classifieds/SellProduct.kt

@@ -44,12 +44,12 @@ import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.input.KeyboardType
-import androidx.compose.ui.text.input.TextFieldValue
+import androidx.compose.ui.text.input.TextFieldValue  // kept for readonly dropdown ThinPaddingTextField
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import coil3.compose.AsyncImage
 import com.vitorpamplona.amethyst.R
-import com.vitorpamplona.amethyst.ui.actions.UrlUserTagTransformation
+import com.vitorpamplona.amethyst.ui.actions.UrlUserTagOutputTransformation
 import com.vitorpamplona.amethyst.ui.components.TextSpinner
 import com.vitorpamplona.amethyst.ui.components.ThinPaddingTextField
 import com.vitorpamplona.amethyst.ui.components.TitleExplainer
@@ -109,10 +109,8 @@ fun SellProduct(postViewModel: NewProductViewModel) {
             )
 
             ThinPaddingTextField(
-                value = postViewModel.title,
+                state = postViewModel.title,
-                onValueChange = {
+                onTextChanged = { postViewModel.onTitleChanged() },
-                    postViewModel.updateTitle(it)
-                },
                 modifier = Modifier.fillMaxWidth(),
                 placeholder = {
                     Text(
@@ -120,8 +118,8 @@ fun SellProduct(postViewModel: NewProductViewModel) {
                         color = MaterialTheme.colorScheme.placeholderText,
                     )
                 },
-                visualTransformation =
+                outputTransformation =
-                    UrlUserTagTransformation(
+                    UrlUserTagOutputTransformation(
                         MaterialTheme.colorScheme.primary,
                     ),
                 colors =
@@ -146,10 +144,8 @@ fun SellProduct(postViewModel: NewProductViewModel) {
 
             ThinPaddingTextField(
                 modifier = Modifier.fillMaxWidth(),
-                value = postViewModel.price,
+                state = postViewModel.price,
-                onValueChange = {
+                onTextChanged = { postViewModel.onPriceChanged() },
-                    postViewModel.updatePrice(it)
-                },
                 placeholder = {
                     Text(
                         text = "1000",
@@ -275,10 +271,10 @@ fun SellProduct(postViewModel: NewProductViewModel) {
                     categoryTypes.map { TitleExplainer(it.second, null) }.toImmutableList()
                 }
             TextSpinner(
-                placeholder = categoryTypes.firstOrNull { it.second == postViewModel.category.text }?.second ?: "",
+                placeholder = categoryTypes.firstOrNull { it.second == postViewModel.category.text.toString() }?.second ?: "",
                 options = categoryOptions,
                 onSelect = {
-                    postViewModel.updateCategory(TextFieldValue(categoryTypes[it].second))
+                    postViewModel.updateCategory(categoryTypes[it].second)
                 },
                 modifier =
                     Modifier
@@ -313,10 +309,8 @@ fun SellProduct(postViewModel: NewProductViewModel) {
             )
 
             ThinPaddingTextField(
-                value = postViewModel.locationText,
+                state = postViewModel.locationText,
-                onValueChange = {
+                onTextChanged = { postViewModel.onLocationChanged() },
-                    postViewModel.updateLocation(it)
-                },
                 modifier = Modifier.fillMaxWidth(),
                 placeholder = {
                     Text(
@@ -324,8 +318,8 @@ fun SellProduct(postViewModel: NewProductViewModel) {
                         color = MaterialTheme.colorScheme.placeholderText,
                     )
                 },
-                visualTransformation =
+                outputTransformation =
-                    UrlUserTagTransformation(
+                    UrlUserTagOutputTransformation(
                         MaterialTheme.colorScheme.primary,
                     ),
                 colors =

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/home/ShortNotePostViewModel.kt

@@ -28,7 +28,8 @@ import androidx.compose.runtime.mutableStateMapOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
 import androidx.compose.runtime.snapshots.SnapshotStateMap
-import androidx.compose.ui.text.input.TextFieldValue
+import androidx.compose.foundation.text.input.TextFieldState
+import androidx.compose.foundation.text.input.setTextAndPlaceCursorAtEnd
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import com.vitorpamplona.amethyst.Amethyst
@@ -183,7 +184,7 @@ open class ShortNotePostViewModel :
     val iMetaAttachments = IMetaAttachments()
     var nip95attachments by mutableStateOf<List<Pair<FileStorageEvent, FileStorageHeaderEvent>>>(emptyList())
 
-    override var message by mutableStateOf(TextFieldValue(""))
+    override val message = TextFieldState()
 
     val urlPreviews = PreviewState()
 
@@ -367,7 +368,7 @@ open class ShortNotePostViewModel :
             multiOrchestrator = null
 
             quote?.let { quotedNote ->
-                message = TextFieldValue(message.text + "\nnostr:${quotedNote.toNEvent()}")
+                message.setTextAndPlaceCursorAtEnd(message.text.toString() + "\nnostr:${quotedNote.toNEvent()}")
 
                 quotedNote.author?.let { quotedUser ->
                     if (quotedUser.pubkeyHex != user.pubkeyHex) {
@@ -385,7 +386,7 @@ open class ShortNotePostViewModel :
             }
 
             fork?.let { forkedNoted ->
-                message = TextFieldValue(version?.event?.content ?: forkedNoted.event?.content ?: "")
+                message.setTextAndPlaceCursorAtEnd(version?.event?.content ?: forkedNoted.event?.content ?: "")
 
                 forkedNoted.event?.isSensitiveOrNSFW()?.let {
                     if (it) wantsToMarkAsSensitive = true
@@ -436,7 +437,7 @@ open class ShortNotePostViewModel :
             }
         }
 
-        urlPreviews.update(message)
+        urlPreviews.update(message.text.toString())
     }
 
     private fun loadFromDraft(draft: Note) {
@@ -533,11 +534,11 @@ open class ShortNotePostViewModel :
         wantsPoll = false
         wantsZapPoll = false
 
-        message = TextFieldValue(draftEvent.content)
+        message.setTextAndPlaceCursorAtEnd(draftEvent.content)
 
         iMetaAttachments.addAll(draftEvent.imetas())
 
-        urlPreviews.update(message)
+        urlPreviews.update(message.text.toString())
     }
 
     private fun loadFromDraft(draftEvent: PollEvent) {
@@ -605,11 +606,11 @@ open class ShortNotePostViewModel :
         pollType = draftEvent.pollType()
         closedAt = draftEvent.endsAt() ?: TimeUtils.oneDayAhead()
 
-        message = TextFieldValue(draftEvent.content)
+        message.setTextAndPlaceCursorAtEnd(draftEvent.content)
 
         iMetaAttachments.addAll(draftEvent.imetas())
 
-        urlPreviews.update(message)
+        urlPreviews.update(message.text.toString())
     }
 
     private fun loadFromDraft(draftEvent: ZapPollEvent) {
@@ -679,11 +680,11 @@ open class ShortNotePostViewModel :
         zapPollConsensusThreshold = draftEvent.consensusThreshold()?.let { (it * 100).toInt() }
         zapPollClosedAt = draftEvent.closedAt() ?: TimeUtils.oneDayAhead()
 
-        message = TextFieldValue(draftEvent.content)
+        message.setTextAndPlaceCursorAtEnd(draftEvent.content)
 
         iMetaAttachments.addAll(draftEvent.imetas())
 
-        urlPreviews.update(message)
+        urlPreviews.update(message.text.toString())
     }
 
     suspend fun sendPostSync() {
@@ -750,7 +751,7 @@ open class ShortNotePostViewModel :
     }
 
     suspend fun sendDraftSync() {
-        if (message.text.isBlank()) {
+        if (message.text.toString().isBlank()) {
             accountViewModel.account.deleteDraftIgnoreErrors(draftTag.current)
         } else {
             val attachments = mutableSetOf<Event>()
@@ -811,7 +812,7 @@ open class ShortNotePostViewModel :
 
         val tagger =
             NewMessageTagger(
-                message.text,
+                message.text.toString(),
                 pTags,
                 eTags,
                 accountViewModel,
@@ -1000,8 +1001,8 @@ open class ShortNotePostViewModel :
                         val note = nip95.let { it1 -> account.consumeNip95(it1.first, it1.second) }
 
                         note?.let {
-                            message = message.insertUrlAtCursor("nostr:" + it.toNEvent())
+                            message.insertUrlAtCursor("nostr:" + it.toNEvent())
-                            urlPreviews.update(message)
+                            urlPreviews.update(message.text.toString())
                         }
                     } else if (state.result is UploadOrchestrator.OrchestratorResult.ServerResult) {
                         val iMeta =
@@ -1024,8 +1025,8 @@ open class ShortNotePostViewModel :
 
                         iMetaAttachments.replace(iMeta.url, iMeta)
 
-                        message = message.insertUrlAtCursor(state.result.url)
+                        message.insertUrlAtCursor(state.result.url)
-                        urlPreviews.update(message)
+                        urlPreviews.update(message.text.toString())
                     }
                 }
 
@@ -1042,7 +1043,7 @@ open class ShortNotePostViewModel :
     open fun cancel() {
         draftTag.rotate()
 
-        message = TextFieldValue("")
+        message.setTextAndPlaceCursorAtEnd("")
 
         forkedFromNote = null
 
@@ -1104,15 +1105,15 @@ open class ShortNotePostViewModel :
     }
 
     open fun addToMessage(it: String) {
-        updateMessage(TextFieldValue(message.text + " " + it))
+        message.setTextAndPlaceCursorAtEnd(message.text.toString() + " " + it)
+        onMessageChanged()
     }
 
-    override fun updateMessage(newMessage: TextFieldValue) {
+    override fun onMessageChanged() {
-        message = newMessage
+        urlPreviews.update(message.text.toString())
-        urlPreviews.update(message)
 
         if (message.selection.collapsed) {
-            val lastWord = newMessage.currentWord()
+            val lastWord = message.currentWord()
             if (lastWord.startsWith("@")) {
                 userSuggestionsMainMessage = UserSuggestionAnchor.MAIN_MESSAGE
                 userSuggestions?.processCurrentWord(lastWord)
@@ -1140,8 +1141,8 @@ open class ShortNotePostViewModel :
         userSuggestions?.let { userSuggestions ->
             if (userSuggestionsMainMessage == UserSuggestionAnchor.MAIN_MESSAGE) {
                 val lastWord = message.currentWord()
-                message = userSuggestions.replaceCurrentWord(message, lastWord, item)
+                userSuggestions.replaceCurrentWord(message, lastWord, item)
-                urlPreviews.update(message)
+                urlPreviews.update(message.text.toString())
             } else if (userSuggestionsMainMessage == UserSuggestionAnchor.FORWARD_ZAPS) {
                 forwardZapTo.value.addItem(item)
                 forwardZapToEditting.value = TextFieldValue("")
@@ -1157,8 +1158,8 @@ open class ShortNotePostViewModel :
     open fun autocompleteWithEmoji(item: EmojiMedia) {
         val wordToInsert = ":${item.code}:"
 
-        message = message.replaceCurrentWord(wordToInsert)
+        message.replaceCurrentWord(wordToInsert)
-        urlPreviews.update(message)
+        urlPreviews.update(message.text.toString())
 
         emojiSuggestions?.reset()
 
@@ -1174,8 +1175,8 @@ open class ShortNotePostViewModel :
             }
         }
 
-        message = message.replaceCurrentWord(wordToInsert)
+        message.replaceCurrentWord(wordToInsert)
-        urlPreviews.update(message)
+        urlPreviews.update(message.text.toString())
 
         emojiSuggestions?.reset()
 
@@ -1201,7 +1202,7 @@ open class ShortNotePostViewModel :
         }
 
         // Regular text/media posts require text
-        return message.text.isNotBlank() &&
+        return message.text.toString().isNotBlank() &&
             !mediaUploadTracker.isUploading &&
             !isUploadingVoice &&
             !wantsInvoice &&
@@ -1226,7 +1227,7 @@ open class ShortNotePostViewModel :
     }
 
     fun insertAtCursor(newElement: String) {
-        message = message.insertUrlAtCursor(newElement)
+        message.insertUrlAtCursor(newElement)
     }
 
     fun selectImage(uris: ImmutableList<SelectedMedia>) {
@@ -1378,7 +1379,7 @@ open class ShortNotePostViewModel :
     override fun updateZapFromText() {
         viewModelScope.launch(Dispatchers.IO) {
             val tagger =
-                NewMessageTagger(message.text, emptyList(), emptyList(), accountViewModel)
+                NewMessageTagger(message.text.toString(), emptyList(), emptyList(), accountViewModel)
             tagger.run()
             tagger.pTags?.forEach { taggedUser ->
                 if (!forwardZapTo.value.items.any { it.key == taggedUser }) {

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/notifications/publicMessages/NewPublicMessageScreen.kt

@@ -56,7 +56,7 @@ import androidx.compose.ui.unit.dp
 import androidx.lifecycle.viewmodel.compose.viewModel
 import com.vitorpamplona.amethyst.R
 import com.vitorpamplona.amethyst.ui.actions.StrippingFailureDialog
-import com.vitorpamplona.amethyst.ui.actions.UrlUserTagTransformation
+import com.vitorpamplona.amethyst.ui.actions.UrlUserTagOutputTransformation
 import com.vitorpamplona.amethyst.ui.actions.uploads.SelectFromFiles
 import com.vitorpamplona.amethyst.ui.actions.uploads.SelectFromGallery
 import com.vitorpamplona.amethyst.ui.actions.uploads.TakePictureButton
@@ -415,8 +415,8 @@ fun SendDirectMessageTo(
             )
 
             ThinPaddingTextField(
-                value = postViewModel.toUsers,
+                state = postViewModel.toUsers,
-                onValueChange = postViewModel::updateToUsers,
+                onTextChanged = postViewModel::onToUsersChanged,
                 modifier =
                     Modifier
                         .weight(1f)
@@ -432,8 +432,8 @@ fun SendDirectMessageTo(
                         color = MaterialTheme.colorScheme.placeholderText,
                     )
                 },
-                visualTransformation =
+                outputTransformation =
-                    UrlUserTagTransformation(
+                    UrlUserTagOutputTransformation(
                         MaterialTheme.colorScheme.primary,
                     ),
                 colors =

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/notifications/publicMessages/NewPublicMessageViewModel.kt

@@ -26,6 +26,7 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableLongStateOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
+import androidx.compose.foundation.text.input.TextFieldState
 import androidx.compose.ui.text.input.TextFieldValue
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
@@ -147,7 +148,7 @@ class NewPublicMessageViewModel :
     val iMetaAttachments = IMetaAttachments()
     var nip95attachments by mutableStateOf<List<Pair<FileStorageEvent, FileStorageHeaderEvent>>>(emptyList())
 
-    override var message by mutableStateOf(TextFieldValue(""))
+    override val message = TextFieldState()
 
     val urlPreviews = PreviewState()
 
@@ -160,7 +161,7 @@ class NewPublicMessageViewModel :
 
     var emojiSuggestions: EmojiSuggestionState? = null
 
-    var toUsers by mutableStateOf(TextFieldValue(""))
+    val toUsers = TextFieldState()
 
     // Images and Videos
     var multiOrchestrator by mutableStateOf<MultiOrchestrator?>(null)
@@ -218,10 +219,9 @@ class NewPublicMessageViewModel :
     fun load(users: Set<HexKey>) {
         val userSet = users - account.userProfile().pubkeyHex
 
-        toUsers =
+        toUsers.setTextAndPlaceCursorAtEnd(
-            TextFieldValue(
+            userSet.mapNotNull { runCatching { Hex.decode(it).toNpub() }.getOrNull() }.joinToString(", ") { "@$it" },
-                userSet.mapNotNull { runCatching { Hex.decode(it).toNpub() }.getOrNull() }.joinToString(", ") { "@$it" },
+        )
-            )
     }
 
     fun reply(post: Note) {
@@ -229,8 +229,8 @@ class NewPublicMessageViewModel :
     }
 
     fun quote(quote: Note) {
-        message = TextFieldValue(message.text + "\nnostr:${quote.toNEvent()}")
+        message.setTextAndPlaceCursorAtEnd(message.text.toString() + "\nnostr:${quote.toNEvent()}")
-        urlPreviews.update(message)
+        urlPreviews.update(message.text.toString())
 
         // creates a split with that author.
         val quotedAuthor = quote.author ?: return
@@ -306,13 +306,12 @@ class NewPublicMessageViewModel :
 
         val userSet = draftEvent.groupKeys() - account.userProfile().pubkeyHex
 
-        toUsers =
+        toUsers.setTextAndPlaceCursorAtEnd(
-            TextFieldValue(
+            userSet.mapNotNull { runCatching { Hex.decode(it).toNpub() }.getOrNull() }.joinToString(", ") { "@$it" },
-                userSet.mapNotNull { runCatching { Hex.decode(it).toNpub() }.getOrNull() }.joinToString(", ") { "@$it" },
+        )
-            )
 
-        message = TextFieldValue(draftEvent.content)
+        message.setTextAndPlaceCursorAtEnd(draftEvent.content)
-        urlPreviews.update(message)
+        urlPreviews.update(message.text.toString())
 
         iMetaAttachments.addAll(draftEvent.imetas())
     }
@@ -349,7 +348,7 @@ class NewPublicMessageViewModel :
     }
 
     suspend fun sendDraftSync() {
-        if (message.text.isBlank()) {
+        if (message.text.toString().isBlank()) {
             accountViewModel.account.deleteDraftIgnoreErrors(draftTag.current)
         } else {
             val broadcast = mutableSetOf<Event>()
@@ -364,13 +363,14 @@ class NewPublicMessageViewModel :
     }
 
     private suspend fun createTemplate(): EventTemplate<PublicMessageEvent> {
-        val toUsersTagger = NewMessageTagger(this@NewPublicMessageViewModel.toUsers.text, null, null, accountViewModel)
+        val toUsersTagger = NewMessageTagger(this@NewPublicMessageViewModel.toUsers.text.toString(), null, null, accountViewModel)
         toUsersTagger.run()
 
+        val messageText = message.text.toString()
         val msg =
             replyingTo?.let {
-                it.toNostrUri() + "\n" + message.text
+                it.toNostrUri() + "\n" + messageText
-            } ?: message.text
+            } ?: messageText
 
         val tagger = NewMessageTagger(msg, null, null, accountViewModel)
         tagger.run()
@@ -470,8 +470,8 @@ class NewPublicMessageViewModel :
                         val note = nip95.let { it1 -> account.consumeNip95(it1.first, it1.second) }
 
                         note?.let {
-                            message = message.insertUrlAtCursor("nostr:" + it.toNEvent())
+                            message.insertUrlAtCursor("nostr:" + it.toNEvent())
-                            urlPreviews.update(message)
+                            urlPreviews.update(message.text.toString())
                         }
                     } else if (state.result is UploadOrchestrator.OrchestratorResult.ServerResult) {
                         val iMeta =
@@ -494,8 +494,8 @@ class NewPublicMessageViewModel :
 
                         iMetaAttachments.replace(iMeta.url, iMeta)
 
-                        message = message.insertUrlAtCursor(state.result.url)
+                        message.insertUrlAtCursor(state.result.url)
-                        urlPreviews.update(message)
+                        urlPreviews.update(message.text.toString())
                     }
                 }
 
@@ -512,8 +512,8 @@ class NewPublicMessageViewModel :
     fun cancel() {
         draftTag.rotate()
 
-        toUsers = TextFieldValue("")
+        toUsers.setTextAndPlaceCursorAtEnd("")
-        message = TextFieldValue("")
+        message.setTextAndPlaceCursorAtEnd("")
         multiOrchestrator = null
 
         wantsInvoice = false
@@ -546,15 +546,15 @@ class NewPublicMessageViewModel :
     }
 
     fun addToMessage(it: String) {
-        updateMessage(TextFieldValue(message.text + " " + it))
+        message.setTextAndPlaceCursorAtEnd(message.text.toString() + " " + it)
+        onMessageChanged()
     }
 
-    override fun updateMessage(newMessage: TextFieldValue) {
+    override fun onMessageChanged() {
-        message = newMessage
+        urlPreviews.update(message.text.toString())
-        urlPreviews.update(newMessage)
 
         if (message.selection.collapsed) {
-            val lastWord = newMessage.currentWord()
+            val lastWord = message.currentWord()
             if (lastWord.startsWith("@")) {
                 userSuggestionsMainMessage = UserSuggestionAnchor.MAIN_MESSAGE
                 userSuggestions?.processCurrentWord(lastWord)
@@ -569,11 +569,9 @@ class NewPublicMessageViewModel :
         draftTag.newVersion()
     }
 
-    fun updateToUsers(newToUsersValue: TextFieldValue) {
+    fun onToUsersChanged() {
-        toUsers = newToUsersValue
+        if (toUsers.selection.collapsed) {
-
+            val lastWord = toUsers.currentWord()
-        if (newToUsersValue.selection.collapsed) {
-            val lastWord = newToUsersValue.currentWord()
             userSuggestionsMainMessage = UserSuggestionAnchor.TO_USERS
             userSuggestions?.processCurrentWord(lastWord)
         }
@@ -594,14 +592,14 @@ class NewPublicMessageViewModel :
         userSuggestions?.let { userSuggestions ->
             if (userSuggestionsMainMessage == UserSuggestionAnchor.MAIN_MESSAGE) {
                 val lastWord = message.currentWord()
-                message = userSuggestions.replaceCurrentWord(message, lastWord, item)
+                userSuggestions.replaceCurrentWord(message, lastWord, item)
-                urlPreviews.update(message)
+                urlPreviews.update(message.text.toString())
             } else if (userSuggestionsMainMessage == UserSuggestionAnchor.FORWARD_ZAPS) {
                 forwardZapTo.value.addItem(item)
                 forwardZapToEditting.value = TextFieldValue("")
             } else if (userSuggestionsMainMessage == UserSuggestionAnchor.TO_USERS) {
                 val lastWord = toUsers.currentWord()
-                toUsers = userSuggestions.replaceCurrentWord(toUsers, lastWord, item)
+                userSuggestions.replaceCurrentWord(toUsers, lastWord, item)
             }
 
             userSuggestionsMainMessage = null
@@ -614,8 +612,8 @@ class NewPublicMessageViewModel :
     fun autocompleteWithEmoji(item: EmojiPackState.EmojiMedia) {
         val wordToInsert = ":${item.code}:"
 
-        message = message.replaceCurrentWord(wordToInsert)
+        message.replaceCurrentWord(wordToInsert)
-        urlPreviews.update(message)
+        urlPreviews.update(message.text.toString())
 
         emojiSuggestions?.reset()
 
@@ -631,8 +629,8 @@ class NewPublicMessageViewModel :
             }
         }
 
-        message = message.replaceCurrentWord(wordToInsert)
+        message.replaceCurrentWord(wordToInsert)
-        urlPreviews.update(message)
+        urlPreviews.update(message.text.toString())
 
         emojiSuggestions?.reset()
 
@@ -648,7 +646,7 @@ class NewPublicMessageViewModel :
             multiOrchestrator == null
 
     fun insertAtCursor(newElement: String) {
-        message = message.insertUrlAtCursor(newElement)
+        message.insertUrlAtCursor(newElement)
     }
 
     fun selectImage(uris: ImmutableList<SelectedMedia>) {
@@ -671,7 +669,7 @@ class NewPublicMessageViewModel :
 
     override fun updateZapFromText() {
         viewModelScope.launch(Dispatchers.IO) {
-            val tagger = NewMessageTagger(message.text, emptyList(), emptyList(), accountViewModel)
+            val tagger = NewMessageTagger(message.text.toString(), emptyList(), emptyList(), accountViewModel)
             tagger.run()
             tagger.pTags?.forEach { taggedUser ->
                 if (!forwardZapTo.value.items.any { it.key == taggedUser }) {

commons/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/compose/TextFieldStateExtensions.kt

@@ -0,0 +1,131 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.amethyst.commons.compose
+
+import androidx.compose.foundation.text.input.TextFieldState
+import androidx.compose.ui.text.TextRange
+import kotlin.math.max
+import kotlin.math.min
+
+fun TextFieldState.insertUrlAtCursor(url: String) {
+    edit {
+        var toInsert = url.trim()
+        val selStart = selection.start
+        val selEnd = selection.end
+        val text = asCharSequence()
+
+        if (selStart > 0 && text[selStart - 1] != ' ' && text[selStart - 1] != '\n') {
+            toInsert = " $toInsert"
+        }
+
+        // takes the position before adding an empty char after the url
+        val endOfUrlIndex = selStart + toInsert.length
+
+        if (selEnd < length && text[selEnd] != ' ' && text[selEnd] != '\n') {
+            toInsert = "$toInsert "
+        }
+
+        replace(selStart, selEnd, toInsert)
+        selection = TextRange(endOfUrlIndex, endOfUrlIndex)
+    }
+}
+
+fun TextFieldState.replaceCurrentWord(wordToInsert: String) {
+    edit {
+        val text = asCharSequence()
+        val selStart = selection.start
+        val selEnd = selection.end
+        val lastWordStart = currentWordStartIdx(text, selStart)
+        val lastWordEnd = currentWordEndIdx(text, selEnd, length)
+        val cursor = lastWordStart + wordToInsert.length
+        replace(lastWordStart, lastWordEnd, wordToInsert)
+        selection = TextRange(cursor, cursor)
+    }
+}
+
+fun TextFieldState.currentWord(): String {
+    val text = this.text
+    val selection = this.selection
+    if (selection.end != selection.start) return ""
+
+    val start = currentWordStartIdx(text, selection.start)
+    val end = currentWordEndIdx(text, selection.end, text.length)
+
+    return if (start < end) {
+        text.subSequence(start, end).toString()
+    } else {
+        ""
+    }
+}
+
+private fun currentWordStartIdx(
+    text: CharSequence,
+    selectionStart: Int,
+): Int {
+    val previousNewLine = text.lastIndexOf('\n', selectionStart - 1)
+    val previousSpace = text.lastIndexOf(' ', selectionStart - 1)
+
+    return max(
+        previousNewLine,
+        previousSpace,
+    ) + 1
+}
+
+private fun currentWordEndIdx(
+    text: CharSequence,
+    selectionEnd: Int,
+    textLength: Int,
+): Int {
+    val nextNewLine = text.indexOf('\n', selectionEnd)
+    val nextSpace = text.indexOf(' ', selectionEnd)
+
+    if (nextSpace < 0 && nextNewLine < 0) return selectionEnd
+    if (nextSpace > 0 && nextNewLine > 0) {
+        return min(
+            nextNewLine,
+            nextSpace,
+        )
+    }
+    if (nextSpace > 0) {
+        return nextSpace
+    }
+    return nextNewLine
+}
+
+private fun CharSequence.lastIndexOf(
+    char: Char,
+    startIndex: Int,
+): Int {
+    for (i in startIndex downTo 0) {
+        if (this[i] == char) return i
+    }
+    return -1
+}
+
+private fun CharSequence.indexOf(
+    char: Char,
+    startIndex: Int,
+): Int {
+    for (i in startIndex until length) {
+        if (this[i] == char) return i
+    }
+    return -1
+}