Merge pull request #2040 from vitorpamplona/claude/migrate-textfield-state-6ezEZ

Migrate text fields from TextFieldValue to TextFieldState

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

@@ -21,6 +21,8 @@
 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.runtime.getValue
 import androidx.compose.runtime.mutableLongStateOf
@@ -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

@@ -34,6 +34,7 @@ import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.imePadding
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.text.input.setTextAndPlaceCursorAtEnd
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.Icon
@@ -46,7 +47,6 @@ 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.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

@@ -24,11 +24,11 @@ import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.text.input.setTextAndPlaceCursorAtEnd
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.text.input.TextFieldValue
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.viewmodel.compose.viewModel
 import com.vitorpamplona.amethyst.service.relayClient.reqCommand.event.EventFinderFilterAssemblerSubscription
@@ -108,7 +108,8 @@ 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

@@ -21,6 +21,7 @@
 package com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.privateDM.send
 
 import android.content.Context
+import androidx.compose.foundation.text.input.TextFieldState
 import androidx.compose.runtime.Stable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableLongStateOf
@@ -203,7 +204,7 @@ class ChatNewMessageViewModel :
 
     var uploadsWaitingToBeSent by mutableStateOf<List<SuccessfulUploads>>(emptyList())
 
-    override var message by mutableStateOf(TextFieldValue(""))
+    override val message = TextFieldState()
 
     val urlPreviews = PreviewState()
 
@@ -215,8 +216,8 @@ 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)
@@ -273,8 +274,7 @@ 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" },
         )
     }
@@ -290,8 +290,8 @@ 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
@@ -371,12 +371,11 @@ 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" },
             )
 
@@ -392,7 +391,7 @@ 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) {
@@ -400,13 +399,14 @@ 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())
     }
@@ -421,7 +421,7 @@ class ChatNewMessageViewModel :
     }
 
     suspend fun sendDraftSync() {
-        if (message.text.isBlank()) {
+        if (message.text.toString().isBlank()) {
             account.deleteDraftIgnoreErrors(draftTag.current)
         } else {
             innerSendPost(draftTag.current)
@@ -563,11 +563,12 @@ 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
@@ -633,8 +634,8 @@ class ChatNewMessageViewModel :
     fun cancel() {
         draftTag.rotate()
 
-        message = TextFieldValue("")
+        message.setTextAndPlaceCursorAtEnd("")
-        subject = TextFieldValue("")
+        subject.setTextAndPlaceCursorAtEnd("")
 
         replyTo.value = null
 
@@ -667,15 +668,15 @@ 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)
@@ -689,11 +690,9 @@ 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)
         }
@@ -706,7 +705,7 @@ 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 }
@@ -720,8 +719,7 @@ class ChatNewMessageViewModel :
         }
     }
 
-    fun updateSubject(it: TextFieldValue) {
+    fun onSubjectChanged() {
-        subject = it
         draftTag.newVersion()
     }
 
@@ -738,14 +736,14 @@ 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()
             }
 
@@ -759,8 +757,8 @@ 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()
 
@@ -776,8 +774,8 @@ class ChatNewMessageViewModel :
             }
         }
 
-        message = message.replaceCurrentWord(wordToInsert)
+        message.replaceCurrentWord(wordToInsert)
-        urlPreviews.update(message)
+        urlPreviews.update(message.text.toString())
 
         emojiSuggestions?.reset()
 
@@ -794,8 +792,8 @@ 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() {
@@ -816,7 +814,7 @@ 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

@@ -37,6 +37,7 @@ import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.lazy.LazyRow
 import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.text.input.setTextAndPlaceCursorAtEnd
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.AddPhotoAlternate
@@ -67,7 +68,6 @@ 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.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

@@ -54,7 +54,7 @@ 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
@@ -201,8 +201,8 @@ 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(),
@@ -231,7 +231,7 @@ 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

@@ -21,6 +21,7 @@
 package com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.publicChannels.send
 
 import android.content.Context
+import androidx.compose.foundation.text.input.TextFieldState
 import androidx.compose.runtime.Stable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableLongStateOf
@@ -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/LongFormPostScreen.kt

@@ -62,12 +62,13 @@ import androidx.lifecycle.viewmodel.compose.viewModel
 import com.vitorpamplona.amethyst.R
 import com.vitorpamplona.amethyst.commons.model.EmptyTagList
 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.SelectSingleFromGallery
 import com.vitorpamplona.amethyst.ui.actions.uploads.TakePictureButton
 import com.vitorpamplona.amethyst.ui.actions.uploads.TakeVideoButton
+import com.vitorpamplona.amethyst.ui.components.ThinPaddingTextField
 import com.vitorpamplona.amethyst.ui.components.markdown.RenderContentAsMarkdown
 import com.vitorpamplona.amethyst.ui.navigation.navs.Nav
 import com.vitorpamplona.amethyst.ui.navigation.topbars.PostingTopBar
@@ -293,7 +294,7 @@ private fun MarkdownPostScreenBody(
                                 .padding(Size10dp),
                     ) {
                         RenderContentAsMarkdown(
-                            content = postViewModel.message.text,
+                            content = postViewModel.message.text.toString(),
                             tags = EmptyTagList,
                             canPreview = true,
                             quotesLeft = 1,
@@ -304,9 +305,9 @@ private fun MarkdownPostScreenBody(
                     }
                 } else {
                     // Markdown editor
-                    OutlinedTextField(
+                    ThinPaddingTextField(
-                        value = postViewModel.message,
+                        state = postViewModel.message,
-                        onValueChange = postViewModel::updateMessage,
+                        onTextChanged = postViewModel::onMessageChanged,
                         modifier =
                             Modifier
                                 .fillMaxWidth()
@@ -328,7 +329,7 @@ private fun MarkdownPostScreenBody(
                                 focusedBorderColor = Color.Transparent,
                                 unfocusedBorderColor = Color.Transparent,
                             ),
-                        visualTransformation = UrlUserTagTransformation(MaterialTheme.colorScheme.primary),
+                        outputTransformation = UrlUserTagOutputTransformation(MaterialTheme.colorScheme.primary),
                         keyboardOptions =
                             KeyboardOptions.Default.copy(
                                 capitalization = KeyboardCapitalization.Sentences,

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

@@ -21,6 +21,8 @@
 package com.vitorpamplona.amethyst.ui.screen.loggedIn.discover.nip23LongForm
 
 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.runtime.getValue
 import androidx.compose.runtime.mutableLongStateOf
@@ -147,7 +149,7 @@ class LongFormPostViewModel :
 
     var isUploadingCoverImage by mutableStateOf(false)
 
-    override var message by mutableStateOf(TextFieldValue(""))
+    override val message = TextFieldState()
 
     var showPreview by mutableStateOf(false)
 
@@ -241,7 +243,7 @@ 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()
             }
 
@@ -265,7 +267,7 @@ 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
@@ -335,7 +337,7 @@ 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
@@ -349,7 +351,7 @@ class LongFormPostViewModel :
 
         val tagger =
             NewMessageTagger(
-                message.text,
+                message.text.toString(),
                 null,
                 null,
                 accountViewModel,
@@ -539,7 +541,7 @@ class LongFormPostViewModel :
                         iMetaAttachments.replace(iMeta.url, iMeta)
 
                         val markdownImage = "![${alt ?: ""}](${state.result.url})"
-                        message = message.insertUrlAtCursor(markdownImage)
+                        message.insertUrlAtCursor(markdownImage)
                     }
                 }
 
@@ -559,7 +561,7 @@ class LongFormPostViewModel :
         title = TextFieldValue("")
         summary = TextFieldValue("")
         coverImageUrl = ""
-        message = TextFieldValue("")
+        message.setTextAndPlaceCursorAtEnd("")
         publishedAt = TimeUtils.now()
         showPreview = false
 
@@ -594,11 +596,9 @@ 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)
@@ -626,7 +626,7 @@ 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("")
@@ -641,7 +641,7 @@ class LongFormPostViewModel :
 
     fun autocompleteWithEmoji(item: EmojiMedia) {
         val wordToInsert = ":${item.code}:"
-        message = message.replaceCurrentWord(wordToInsert)
+        message.replaceCurrentWord(wordToInsert)
         emojiSuggestions?.reset()
         draftTag.newVersion()
     }
@@ -655,21 +655,21 @@ 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>) {
@@ -699,7 +699,7 @@ class LongFormPostViewModel :
     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/discover/nip99Classifieds/NewProductScreen.kt

@@ -31,6 +31,7 @@ import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.imePadding
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.text.input.setTextAndPlaceCursorAtEnd
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.MaterialTheme
@@ -41,7 +42,6 @@ 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.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

@@ -21,6 +21,7 @@
 package com.vitorpamplona.amethyst.ui.screen.loggedIn.discover.nip99Classifieds
 
 import android.content.Context
+import androidx.compose.foundation.text.input.TextFieldState
 import androidx.compose.runtime.Stable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableLongStateOf
@@ -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/geohash/GeoHashPostScreen.kt

@@ -20,10 +20,10 @@
  */
 package com.vitorpamplona.amethyst.ui.screen.loggedIn.geohash
 
+import androidx.compose.foundation.text.input.setTextAndPlaceCursorAtEnd
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.ui.platform.LocalContext
-import androidx.compose.ui.text.input.TextFieldValue
 import androidx.core.net.toUri
 import androidx.lifecycle.viewmodel.compose.viewModel
 import com.vitorpamplona.amethyst.ui.actions.uploads.SelectedMedia
@@ -67,7 +67,8 @@ fun GeoHashPostScreen(
             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/hashtag/HashtagPostScreen.kt

@@ -20,10 +20,10 @@
  */
 package com.vitorpamplona.amethyst.ui.screen.loggedIn.hashtag
 
+import androidx.compose.foundation.text.input.setTextAndPlaceCursorAtEnd
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.ui.platform.LocalContext
-import androidx.compose.ui.text.input.TextFieldValue
 import androidx.core.net.toUri
 import androidx.lifecycle.viewmodel.compose.viewModel
 import com.vitorpamplona.amethyst.ui.actions.uploads.SelectedMedia
@@ -67,7 +67,8 @@ fun HashtagPostScreen(
             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/home/ShortNotePostScreen.kt

@@ -37,6 +37,7 @@ import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.imePadding
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.text.input.setTextAndPlaceCursorAtEnd
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.outlined.Poll
@@ -54,7 +55,6 @@ import androidx.compose.runtime.collectAsState
 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.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.core.content.IntentCompat
@@ -150,7 +150,8 @@ fun ShortNotePostScreen(
         val draft = draftId?.let { accountViewModel.getNoteIfExists(it) }
         postViewModel.load(baseReplyTo, quote, fork, version, draft)
         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/home/ShortNotePostViewModel.kt

@@ -21,6 +21,8 @@
 package com.vitorpamplona.amethyst.ui.screen.loggedIn.home
 
 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.runtime.getValue
 import androidx.compose.runtime.mutableLongStateOf
@@ -183,7 +185,7 @@ 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 +369,7 @@ 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 +387,7 @@ 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 +438,7 @@ open class ShortNotePostViewModel :
             }
         }
 
-        urlPreviews.update(message)
+        urlPreviews.update(message.text.toString())
     }
 
     private fun loadFromDraft(draft: Note) {
@@ -533,11 +535,11 @@ 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 +607,11 @@ 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 +681,11 @@ 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 +752,7 @@ 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 +813,7 @@ open class ShortNotePostViewModel :
 
         val tagger =
             NewMessageTagger(
-                message.text,
+                message.text.toString(),
                 pTags,
                 eTags,
                 accountViewModel,
@@ -1000,8 +1002,8 @@ 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 +1026,8 @@ 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 +1044,7 @@ open class ShortNotePostViewModel :
     open fun cancel() {
         draftTag.rotate()
 
-        message = TextFieldValue("")
+        message.setTextAndPlaceCursorAtEnd("")
 
         forkedFromNote = null
 
@@ -1104,15 +1106,15 @@ 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 +1142,8 @@ 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 +1159,8 @@ 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 +1176,8 @@ open class ShortNotePostViewModel :
             }
         }
 
-        message = message.replaceCurrentWord(wordToInsert)
+        message.replaceCurrentWord(wordToInsert)
-        urlPreviews.update(message)
+        urlPreviews.update(message.text.toString())
 
         emojiSuggestions?.reset()
 
@@ -1201,7 +1203,7 @@ open class ShortNotePostViewModel :
         }
 
         // Regular text/media posts require text
-        return message.text.isNotBlank() &&
+        return message.text.toString().isNotBlank() &&
             !mediaUploadTracker.isUploading &&
             !isUploadingVoice &&
             !wantsInvoice &&
@@ -1226,7 +1228,7 @@ open class ShortNotePostViewModel :
     }
 
     fun insertAtCursor(newElement: String) {
-        message = message.insertUrlAtCursor(newElement)
+        message.insertUrlAtCursor(newElement)
     }
 
     fun selectImage(uris: ImmutableList<SelectedMedia>) {
@@ -1378,7 +1380,7 @@ 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

@@ -21,6 +21,7 @@
 package com.vitorpamplona.amethyst.ui.screen.loggedIn.notifications.publicMessages
 
 import android.content.Context
+import androidx.compose.foundation.text.input.TextFieldState
 import androidx.compose.runtime.Stable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableLongStateOf
@@ -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)
@@ -218,8 +219,7 @@ 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" },
         )
     }
@@ -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" },
         )
 
-        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
+}