Integrate WYSIWYG editor (#7288)

* Add WYSIWYG lib dependency

* Replace EditText with RichTextEditor

* Add bold button, fix sending formatting messages issues

* Add missing inline formatting buttons, make scrollview horizontal

* Disable autocomplete for rich text editor

* Add formatted text to messages sent, replies, quotes and edited messages.

* Several fixes

* Add changelog

* Try to fix lint issues

* Address review comments.

* Exclude Epoxy KSP generated files from ktlint checks

build.gradle

@@ -148,6 +148,9 @@ allprojects {
             // To have XML report for Danger
             reporter(org.jlleitschuh.gradle.ktlint.reporter.ReporterType.CHECKSTYLE)
         }
+        filter {
+            exclude { element -> element.file.path.contains("$buildDir/generated/") }
+        }
         disabledRules = [
                 // TODO Re-enable these 4 rules after reformatting project
                 "indent",

changelog.d/7288.feature

@@ -0,0 +1 @@
+Add WYSIWYG editor.

changelog.d/7288.sdk

@@ -0,0 +1,10 @@
+Add `formattedText` or similar optional parameters in several methods:
+
+* RelationService:
+	* editTextMessage
+	* editReply
+	* replyToMessage
+* SendService:
+	* sendQuotedTextMessage
+
+This allows us to send any HTML formatted text message without needing to rely on automatic Markdown > HTML translation. All these new parameters have a `null` value by default, so previous calls to these API methods remain compatible.

dependencies.gradle

@@ -102,6 +102,7 @@ ext.libs = [
         ],
         element     : [
                 'opusencoder'             : "io.element.android:opusencoder:1.1.0",
+                'wysiwyg'                 : "io.element.android:wysiwyg:0.1.0"
         ],
         squareup    : [
                 'moshi'                  : "com.squareup.moshi:moshi:$moshi",

dependencies_groups.gradle

@@ -178,6 +178,7 @@ ext.groups = [
                         'org.apache.httpcomponents',
                         'org.apache.sanselan',
                         'org.bouncycastle',
+                        'org.ccil.cowan.tagsoup',
                         'org.checkerframework',
                         'org.codehaus',
                         'org.codehaus.groovy',

library/ui-strings/src/main/res/values/strings.xml

@@ -446,6 +446,9 @@
     <string name="labs_enable_deferred_dm_title">Enable deferred DMs</string>
     <string name="labs_enable_deferred_dm_summary">Create DM only on first message</string>
 
+    <string name="labs_enable_rich_text_editor_title">Enable rich text editor</string>
+    <string name="labs_enable_rich_text_editor_summary">Use a rich text editor to send formatted messages</string>
+
     <!-- Home fragment -->
     <string name="invitations_header">Invites</string>
     <string name="low_priority_header">Low priority</string>

matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/model/relation/RelationService.kt

@@ -91,7 +91,8 @@ interface RelationService {
      * Edit a text message body. Limited to "m.text" contentType.
      * @param targetEvent The event to edit
      * @param msgType the message type
-     * @param newBodyText The edited body
+     * @param newBodyText The edited body in plain text
+     * @param newFormattedBodyText The edited body with format
      * @param newBodyAutoMarkdown true to parse markdown on the new body
      * @param compatibilityBodyText The text that will appear on clients that don't support yet edition
      */
@@ -99,6 +100,7 @@ interface RelationService {
             targetEvent: TimelineEvent,
             msgType: String,
             newBodyText: CharSequence,
+            newFormattedBodyText: CharSequence? = null,
             newBodyAutoMarkdown: Boolean,
             compatibilityBodyText: String = "* $newBodyText"
     ): Cancelable
@@ -108,13 +110,15 @@ interface RelationService {
      * This method will take the new body (stripped from fallbacks) and re-add them before sending.
      * @param replyToEdit The event to edit
      * @param originalTimelineEvent the message that this reply (being edited) is relating to
-     * @param newBodyText The edited body (stripped from in reply to content)
+     * @param newBodyText The plain text edited body (stripped from in reply to content)
+     * @param newFormattedBodyText The formatted edited body (stripped from in reply to content)
      * @param compatibilityBodyText The text that will appear on clients that don't support yet edition
      */
     fun editReply(
             replyToEdit: TimelineEvent,
             originalTimelineEvent: TimelineEvent,
             newBodyText: String,
+            newFormattedBodyText: String? = null,
             compatibilityBodyText: String = "* $newBodyText"
     ): Cancelable
 
@@ -133,6 +137,7 @@ interface RelationService {
      * by the sdk into pills.
      * @param eventReplied the event referenced by the reply
      * @param replyText the reply text
+     * @param replyFormattedText the reply text, formatted
      * @param autoMarkdown If true, the SDK will generate a formatted HTML message from the body text if markdown syntax is present
      * @param showInThread If true, relation will be added to the reply in order to be visible from within threads
      * @param rootThreadEventId If show in thread is true then we need the rootThreadEventId to generate the relation
@@ -140,6 +145,7 @@ interface RelationService {
     fun replyToMessage(
             eventReplied: TimelineEvent,
             replyText: CharSequence,
+            replyFormattedText: CharSequence? = null,
             autoMarkdown: Boolean = false,
             showInThread: Boolean = false,
             rootThreadEventId: String? = null

matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/send/SendService.kt

@@ -60,12 +60,19 @@ interface SendService {
     /**
      * Method to quote an events content.
      * @param quotedEvent The event to which we will quote it's content.
-     * @param text the text message to send
+     * @param text the plain text message to send
+     * @param formattedText the formatted text message to send
      * @param autoMarkdown If true, the SDK will generate a formatted HTML message from the body text if markdown syntax is present
      * @param rootThreadEventId when this param is not null, the message will be sent in this specific thread
      * @return a [Cancelable]
      */
-    fun sendQuotedTextMessage(quotedEvent: TimelineEvent, text: String, autoMarkdown: Boolean, rootThreadEventId: String? = null): Cancelable
+    fun sendQuotedTextMessage(
+            quotedEvent: TimelineEvent,
+            text: String,
+            formattedText: String? = null,
+            autoMarkdown: Boolean,
+            rootThreadEventId: String? = null
+    ): Cancelable
 
     /**
      * Method to send a media asynchronously.

matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/timeline/TimelineEvent.kt

@@ -33,6 +33,7 @@ import org.matrix.android.sdk.api.session.room.model.ReadReceipt
 import org.matrix.android.sdk.api.session.room.model.message.MessageBeaconInfoContent
 import org.matrix.android.sdk.api.session.room.model.message.MessageBeaconLocationDataContent
 import org.matrix.android.sdk.api.session.room.model.message.MessageContent
+import org.matrix.android.sdk.api.session.room.model.message.MessageContentWithFormattedBody
 import org.matrix.android.sdk.api.session.room.model.message.MessagePollContent
 import org.matrix.android.sdk.api.session.room.model.message.MessageStickerContent
 import org.matrix.android.sdk.api.session.room.model.message.MessageTextContent
@@ -181,7 +182,8 @@ fun TimelineEvent.isRootThread(): Boolean {
  * Get the latest message body, after a possible edition, stripping the reply prefix if necessary.
  */
 fun TimelineEvent.getTextEditableContent(): String {
-    val lastContentBody = getLastMessageContent()?.body ?: return ""
+    val lastMessageContent = getLastMessageContent()
+    val lastContentBody = lastMessageContent.getFormattedBody() ?: return ""
     return if (isReply()) {
         extractUsefulTextFromReply(lastContentBody)
     } else {
@@ -199,3 +201,11 @@ fun MessageContent.getTextDisplayableContent(): String {
             ?: (this as MessageTextContent?)?.matrixFormattedBody?.let { ContentUtils.formatSpoilerTextFromHtml(it) }
             ?: body
 }
+
+fun MessageContent?.getFormattedBody(): String? {
+    return if (this is MessageContentWithFormattedBody) {
+        formattedBody
+    } else {
+        this?.body
+    }
+}

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/relation/DefaultRelationService.kt

@@ -105,19 +105,21 @@ internal class DefaultRelationService @AssistedInject constructor(
             targetEvent: TimelineEvent,
             msgType: String,
             newBodyText: CharSequence,
+            newFormattedBodyText: CharSequence?,
             newBodyAutoMarkdown: Boolean,
             compatibilityBodyText: String
     ): Cancelable {
-        return eventEditor.editTextMessage(targetEvent, msgType, newBodyText, newBodyAutoMarkdown, compatibilityBodyText)
+        return eventEditor.editTextMessage(targetEvent, msgType, newBodyText, newFormattedBodyText, newBodyAutoMarkdown, compatibilityBodyText)
     }
 
     override fun editReply(
             replyToEdit: TimelineEvent,
             originalTimelineEvent: TimelineEvent,
             newBodyText: String,
+            newFormattedBodyText: String?,
             compatibilityBodyText: String
     ): Cancelable {
-        return eventEditor.editReply(replyToEdit, originalTimelineEvent, newBodyText, compatibilityBodyText)
+        return eventEditor.editReply(replyToEdit, originalTimelineEvent, newBodyText, newFormattedBodyText, compatibilityBodyText)
     }
 
     override suspend fun fetchEditHistory(eventId: String): List<Event> {
@@ -127,6 +129,7 @@ internal class DefaultRelationService @AssistedInject constructor(
     override fun replyToMessage(
             eventReplied: TimelineEvent,
             replyText: CharSequence,
+            replyFormattedText: CharSequence?,
             autoMarkdown: Boolean,
             showInThread: Boolean,
             rootThreadEventId: String?
@@ -135,6 +138,7 @@ internal class DefaultRelationService @AssistedInject constructor(
                 roomId = roomId,
                 eventReplied = eventReplied,
                 replyText = replyText,
+                replyTextFormatted = replyFormattedText,
                 autoMarkdown = autoMarkdown,
                 rootThreadEventId = rootThreadEventId,
                 showInThread = showInThread
@@ -178,6 +182,7 @@ internal class DefaultRelationService @AssistedInject constructor(
                     roomId = roomId,
                     eventReplied = eventReplied,
                     replyText = replyInThreadText,
+                    replyTextFormatted = formattedText,
                     autoMarkdown = autoMarkdown,
                     rootThreadEventId = rootThreadEventId,
                     showInThread = false

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/relation/EventEditor.kt

@@ -23,6 +23,7 @@ import org.matrix.android.sdk.api.session.room.send.SendState
 import org.matrix.android.sdk.api.session.room.timeline.TimelineEvent
 import org.matrix.android.sdk.api.util.Cancelable
 import org.matrix.android.sdk.api.util.NoOpCancellable
+import org.matrix.android.sdk.api.util.TextContent
 import org.matrix.android.sdk.internal.database.mapper.toEntity
 import org.matrix.android.sdk.internal.session.room.send.LocalEchoEventFactory
 import org.matrix.android.sdk.internal.session.room.send.LocalEchoRepository
@@ -42,19 +43,25 @@ internal class EventEditor @Inject constructor(
             targetEvent: TimelineEvent,
             msgType: String,
             newBodyText: CharSequence,
+            newBodyFormattedText: CharSequence?,
             newBodyAutoMarkdown: Boolean,
             compatibilityBodyText: String
     ): Cancelable {
         val roomId = targetEvent.roomId
         if (targetEvent.root.sendState.hasFailed()) {
             // We create a new in memory event for the EventSenderProcessor but we keep the eventId of the failed event.
-            val editedEvent = eventFactory.createTextEvent(roomId, msgType, newBodyText, newBodyAutoMarkdown).copy(
+            val editedEvent = if (newBodyFormattedText != null) {
+                val content = TextContent(newBodyText.toString(), newBodyFormattedText.toString())
+                eventFactory.createFormattedTextEvent(roomId, content, msgType)
+            } else {
+                eventFactory.createTextEvent(roomId, msgType, newBodyText, newBodyAutoMarkdown)
+            }.copy(
                     eventId = targetEvent.eventId
             )
             return sendFailedEvent(targetEvent, editedEvent)
         } else if (targetEvent.root.sendState.isSent()) {
             val event = eventFactory
-                    .createReplaceTextEvent(roomId, targetEvent.eventId, newBodyText, newBodyAutoMarkdown, msgType, compatibilityBodyText)
+                    .createReplaceTextEvent(roomId, targetEvent.eventId, newBodyText, newBodyFormattedText, newBodyAutoMarkdown, msgType, compatibilityBodyText)
             return sendReplaceEvent(event)
         } else {
             // Should we throw?
@@ -100,6 +107,7 @@ internal class EventEditor @Inject constructor(
             replyToEdit: TimelineEvent,
             originalTimelineEvent: TimelineEvent,
             newBodyText: String,
+            newBodyFormattedText: String?,
             compatibilityBodyText: String
     ): Cancelable {
         val roomId = replyToEdit.roomId
@@ -109,6 +117,7 @@ internal class EventEditor @Inject constructor(
                     roomId = roomId,
                     eventReplied = originalTimelineEvent,
                     replyText = newBodyText,
+                    replyTextFormatted = newBodyFormattedText,
                     autoMarkdown = false,
                     showInThread = false
             )?.copy(

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/send/DefaultSendService.kt

@@ -99,11 +99,18 @@ internal class DefaultSendService @AssistedInject constructor(
                 .let { sendEvent(it) }
     }
 
-    override fun sendQuotedTextMessage(quotedEvent: TimelineEvent, text: String, autoMarkdown: Boolean, rootThreadEventId: String?): Cancelable {
+    override fun sendQuotedTextMessage(
+            quotedEvent: TimelineEvent,
+            text: String,
+            formattedText: String?,
+            autoMarkdown: Boolean,
+            rootThreadEventId: String?
+    ): Cancelable {
         return localEchoEventFactory.createQuotedTextEvent(
                 roomId = roomId,
                 quotedEvent = quotedEvent,
                 text = text,
+                formattedText = formattedText,
                 autoMarkdown = autoMarkdown,
                 rootThreadEventId = rootThreadEventId
         )

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/send/LocalEchoEventFactory.kt

@@ -124,19 +124,23 @@ internal class LocalEchoEventFactory @Inject constructor(
             roomId: String,
             targetEventId: String,
             newBodyText: CharSequence,
+            newBodyFormattedText: CharSequence?,
             newBodyAutoMarkdown: Boolean,
             msgType: String,
             compatibilityText: String
     ): Event {
+        val content = if (newBodyFormattedText != null) {
+            TextContent(newBodyText.toString(), newBodyFormattedText.toString()).toMessageTextContent(msgType)
+        } else {
+            createTextContent(newBodyText, newBodyAutoMarkdown).toMessageTextContent(msgType)
+        }.toContent()
         return createMessageEvent(
                 roomId,
                 MessageTextContent(
                         msgType = msgType,
                         body = compatibilityText,
                         relatesTo = RelationDefaultContent(RelationType.REPLACE, targetEventId),
-                        newContent = createTextContent(newBodyText, newBodyAutoMarkdown)
+                        newContent = content,
-                                .toMessageTextContent(msgType)
-                                .toContent()
                 )
         )
     }
@@ -581,6 +585,7 @@ internal class LocalEchoEventFactory @Inject constructor(
             roomId: String,
             eventReplied: TimelineEvent,
             replyText: CharSequence,
+            replyTextFormatted: CharSequence?,
             autoMarkdown: Boolean,
             rootThreadEventId: String? = null,
             showInThread: Boolean
@@ -594,7 +599,7 @@ internal class LocalEchoEventFactory @Inject constructor(
         val body = bodyForReply(eventReplied.getLastMessageContent(), eventReplied.isReply())
 
         // As we always supply formatted body for replies we should force the MarkdownParser to produce html.
-        val replyTextFormatted = markdownParser.parse(replyText, force = true, advanced = autoMarkdown).takeFormatted()
+        val finalReplyTextFormatted = replyTextFormatted?.toString() ?: markdownParser.parse(replyText, force = true, advanced = autoMarkdown).takeFormatted()
         // Body of the original message may not have formatted version, so may also have to convert to html.
         val bodyFormatted = body.formattedText ?: markdownParser.parse(body.text, force = true, advanced = autoMarkdown).takeFormatted()
         val replyFormatted = buildFormattedReply(
@@ -602,7 +607,7 @@ internal class LocalEchoEventFactory @Inject constructor(
                 userLink,
                 userId,
                 bodyFormatted,
-                replyTextFormatted
+                finalReplyTextFormatted
         )
         //
         // > <@alice:example.org> This is the original body
@@ -765,18 +770,20 @@ internal class LocalEchoEventFactory @Inject constructor(
             roomId: String,
             quotedEvent: TimelineEvent,
             text: String,
+            formattedText: String?,
             autoMarkdown: Boolean,
             rootThreadEventId: String?
     ): Event {
         val messageContent = quotedEvent.getLastMessageContent()
-        val textMsg = messageContent?.body
+        val textMsg = if (messageContent is MessageContentWithFormattedBody) { messageContent.formattedBody } else { messageContent?.body }
         val quoteText = legacyRiotQuoteText(textMsg, text)
+        val quoteFormattedText = "<blockquote>$textMsg</blockquote>$formattedText"
 
         return if (rootThreadEventId != null) {
             createMessageEvent(
                     roomId,
                     markdownParser
-                            .parse(quoteText, force = true, advanced = autoMarkdown)
+                            .parse(quoteText, force = true, advanced = autoMarkdown).copy(formattedText = quoteFormattedText)
                             .toThreadTextContent(
                                     rootThreadEventId = rootThreadEventId,
                                     latestThreadEventId = localEchoRepository.getLatestThreadEvent(rootThreadEventId),
@@ -786,7 +793,7 @@ internal class LocalEchoEventFactory @Inject constructor(
         } else {
             createFormattedTextEvent(
                     roomId,
-                    markdownParser.parse(quoteText, force = true, advanced = autoMarkdown),
+                    markdownParser.parse(quoteText, force = true, advanced = autoMarkdown).copy(formattedText = quoteFormattedText),
                     MessageType.MSGTYPE_TEXT
             )
         }

vector-config/src/main/res/values/config-settings.xml

@@ -43,6 +43,8 @@
     <bool name="settings_labs_new_app_layout_default">true</bool>
     <bool name="settings_timeline_show_live_sender_info_visible">true</bool>
     <bool name="settings_timeline_show_live_sender_info_default">false</bool>
+    <bool name="settings_labs_rich_text_editor_visible">true</bool>
+    <bool name="settings_labs_rich_text_editor_default">false</bool>
     <!-- Level 1: Advanced settings -->
 
     <!-- Level 1: Help and about -->

vector/build.gradle

@@ -104,6 +104,7 @@ android {
     }
 }
 dependencies {
+
     implementation project(":vector-config")
     api project(":matrix-sdk-android")
     implementation project(":matrix-sdk-android-flow")
@@ -143,6 +144,9 @@ dependencies {
     // Opus Encoder
     implementation libs.element.opusencoder
 
+    // WYSIWYG Editor
+    implementation libs.element.wysiwyg
+
     // Log
     api libs.jakewharton.timber
 

vector/src/main/java/im/vector/app/features/command/CommandParser.kt

@@ -18,6 +18,7 @@ package im.vector.app.features.command
 
 import im.vector.app.core.extensions.isEmail
 import im.vector.app.core.extensions.isMsisdn
+import im.vector.app.core.extensions.orEmpty
 import im.vector.app.features.home.room.detail.ChatEffect
 import org.matrix.android.sdk.api.MatrixPatterns
 import org.matrix.android.sdk.api.MatrixUrls.isMxcUrl
@@ -30,39 +31,30 @@ class CommandParser @Inject constructor() {
     /**
      * Convert the text message into a Slash command.
      *
-     * @param textMessage the text message
+     * @param textMessage the text message in plain text
+     * @param formattedMessage the text messaged in HTML format
      * @param isInThreadTimeline true if the user is currently typing in a thread
      * @return a parsed slash command (ok or error)
      */
-    fun parseSlashCommand(textMessage: CharSequence, isInThreadTimeline: Boolean): ParsedCommand {
+    @Suppress("NAME_SHADOWING")
+    fun parseSlashCommand(textMessage: CharSequence, formattedMessage: String?, isInThreadTimeline: Boolean): ParsedCommand {
         // check if it has the Slash marker
-        return if (!textMessage.startsWith("/")) {
+        val message = formattedMessage ?: textMessage
+        return if (!message.startsWith("/")) {
             ParsedCommand.ErrorNotACommand
         } else {
             // "/" only
-            if (textMessage.length == 1) {
+            if (message.length == 1) {
                 return ParsedCommand.ErrorEmptySlashCommand
             }
 
             // Exclude "//"
-            if ("/" == textMessage.substring(1, 2)) {
+            if ("/" == message.substring(1, 2)) {
                 return ParsedCommand.ErrorNotACommand
             }
 
-            val messageParts = try {
+            val (messageParts, message) = extractMessage(message.toString()) ?: return ParsedCommand.ErrorEmptySlashCommand
-                textMessage.split("\\s+".toRegex()).dropLastWhile { it.isEmpty() }
-            } catch (e: Exception) {
-                Timber.e(e, "## parseSlashCommand() : split failed")
-                null
-            }
-
-            // test if the string cut fails
-            if (messageParts.isNullOrEmpty()) {
-                return ParsedCommand.ErrorEmptySlashCommand
-            }
-
             val slashCommand = messageParts.first()
-            val message = textMessage.substring(slashCommand.length).trim()
 
             getNotSupportedByThreads(isInThreadTimeline, slashCommand)?.let {
                 return ParsedCommand.ErrorCommandNotSupportedInThreads(it)
@@ -71,7 +63,12 @@ class CommandParser @Inject constructor() {
             when {
                 Command.PLAIN.matches(slashCommand) -> {
                     if (message.isNotEmpty()) {
+                        if (formattedMessage != null) {
+                            val trimmedPlainTextMessage = extractMessage(textMessage.toString())?.second.orEmpty()
+                            ParsedCommand.SendFormattedText(message = trimmedPlainTextMessage, formattedMessage = message)
+                        } else {
                             ParsedCommand.SendPlainText(message = message)
+                        }
                     } else {
                         ParsedCommand.ErrorSyntax(Command.PLAIN)
                     }
@@ -415,6 +412,25 @@ class CommandParser @Inject constructor() {
         }
     }
 
+    private fun extractMessage(message: String): Pair<List<String>, String>? {
+        val messageParts = try {
+            message.split("\\s+".toRegex()).dropLastWhile { it.isEmpty() }
+        } catch (e: Exception) {
+            Timber.e(e, "## parseSlashCommand() : split failed")
+            null
+        }
+
+        // test if the string cut fails
+        if (messageParts.isNullOrEmpty()) {
+            return null
+        }
+
+        val slashCommand = messageParts.first()
+        val trimmedMessage = message.substring(slashCommand.length).trim()
+
+        return messageParts to trimmedMessage
+    }
+
     private val notSupportedThreadsCommands: List<Command> by lazy {
         Command.values().filter {
             !it.isThreadCommand

vector/src/main/java/im/vector/app/features/command/ParsedCommand.kt

@@ -39,6 +39,7 @@ sealed interface ParsedCommand {
     // Valid commands:
 
     data class SendPlainText(val message: CharSequence) : ParsedCommand
+    data class SendFormattedText(val message: CharSequence, val formattedMessage: String) : ParsedCommand
     data class SendEmote(val message: CharSequence) : ParsedCommand
     data class SendRainbow(val message: CharSequence) : ParsedCommand
     data class SendRainbowEmote(val message: CharSequence) : ParsedCommand

vector/src/main/java/im/vector/app/features/home/room/detail/composer/MessageComposerAction.kt

@@ -23,7 +23,7 @@ import org.matrix.android.sdk.api.session.content.ContentAttachmentData
 import org.matrix.android.sdk.api.session.room.model.message.MessageAudioContent
 
 sealed class MessageComposerAction : VectorViewModelAction {
-    data class SendMessage(val text: CharSequence, val autoMarkdown: Boolean) : MessageComposerAction()
+    data class SendMessage(val text: CharSequence, val formattedText: String?, val autoMarkdown: Boolean) : MessageComposerAction()
     data class EnterEditMode(val eventId: String) : MessageComposerAction()
     data class EnterQuoteMode(val eventId: String) : MessageComposerAction()
     data class EnterReplyMode(val eventId: String) : MessageComposerAction()

vector/src/main/java/im/vector/app/features/home/room/detail/composer/MessageComposerFragment.kt

@@ -37,6 +37,7 @@ import androidx.annotation.RequiresApi
 import androidx.annotation.StringRes
 import androidx.core.content.ContextCompat
 import androidx.core.text.buildSpannedString
+import androidx.core.view.isGone
 import androidx.core.view.isInvisible
 import androidx.core.view.isVisible
 import androidx.lifecycle.Lifecycle
@@ -161,6 +162,14 @@ class MessageComposerFragment : VectorBaseFragment<FragmentComposerBinding>(), A
     private val messageComposerViewModel: MessageComposerViewModel by parentFragmentViewModel()
     private lateinit var sharedActionViewModel: MessageSharedActionViewModel
 
+    private val composer: MessageComposerView get() {
+        return if (vectorPreferences.isRichTextEditorEnabled()) {
+            views.richTextComposerLayout
+        } else {
+            views.composerLayout
+        }
+    }
+
     override fun getBinding(inflater: LayoutInflater, container: ViewGroup?): FragmentComposerBinding {
         return FragmentComposerBinding.inflate(inflater, container, false)
     }
@@ -175,6 +184,9 @@ class MessageComposerFragment : VectorBaseFragment<FragmentComposerBinding>(), A
         setupComposer()
         setupEmojiButton()
 
+        views.composerLayout.isGone = vectorPreferences.isRichTextEditorEnabled()
+        views.richTextComposerLayout.isVisible = vectorPreferences.isRichTextEditorEnabled()
+
         messageComposerViewModel.observeViewEvents {
             when (it) {
                 is MessageComposerViewEvents.JoinRoomCommandSuccess -> handleJoinedToAnotherRoom(it)
@@ -218,29 +230,33 @@ class MessageComposerFragment : VectorBaseFragment<FragmentComposerBinding>(), A
         if (withState(messageComposerViewModel) { it.isVoiceRecording } && requireActivity().isChangingConfigurations) {
             // we're rotating, maintain any active recordings
         } else {
-            messageComposerViewModel.handle(MessageComposerAction.OnEntersBackground(views.composerLayout.text.toString()))
+            messageComposerViewModel.handle(MessageComposerAction.OnEntersBackground(composer.text.toString()))
         }
     }
 
     override fun onDestroyView() {
         super.onDestroyView()
 
+        if (!vectorPreferences.isRichTextEditorEnabled()) {
             autoCompleter.clear()
+        }
         messageComposerViewModel.endAllVoiceActions()
     }
 
     override fun invalidate() = withState(timelineViewModel, messageComposerViewModel) { mainState, messageComposerState ->
         if (mainState.tombstoneEvent != null) return@withState
 
-        views.root.isInvisible = !messageComposerState.isComposerVisible
+        composer.setInvisible(!messageComposerState.isComposerVisible)
-        views.composerLayout.views.sendButton.isInvisible = !messageComposerState.isSendButtonVisible
+        composer.sendButton.isInvisible = !messageComposerState.isSendButtonVisible
     }
 
     private fun setupComposer() {
-        val composerEditText = views.composerLayout.views.composerEditText
+        val composerEditText = composer.editText
         composerEditText.setHint(R.string.room_message_placeholder)
 
+        if (!vectorPreferences.isRichTextEditorEnabled()) {
             autoCompleter.setup(composerEditText)
+        }
 
         observerUserTyping()
 
@@ -257,20 +273,22 @@ class MessageComposerFragment : VectorBaseFragment<FragmentComposerBinding>(), A
                     !keyEvent.isShiftPressed &&
                     keyEvent.keyCode == KeyEvent.KEYCODE_ENTER &&
                     resources.configuration.keyboard != Configuration.KEYBOARD_NOKEYS
-            if (isSendAction || externalKeyboardPressedEnter) {
+            val result = if (isSendAction || externalKeyboardPressedEnter) {
                 sendTextMessage(v.text)
                 true
             } else false
+            composer.setTextIfDifferent(null)
+            result
         }
 
-        views.composerLayout.views.composerEmojiButton.isVisible = vectorPreferences.showEmojiKeyboard()
+        composer.emojiButton?.isVisible = vectorPreferences.showEmojiKeyboard()
 
         val showKeyboard = withState(timelineViewModel) { it.showKeyboardWhenPresented }
         if (isThreadTimeLine() && showKeyboard) {
             // Show keyboard when the user started a thread
-            views.composerLayout.views.composerEditText.showKeyboard(andRequestFocus = true)
+            composerEditText.showKeyboard(andRequestFocus = true)
         }
-        views.composerLayout.callback = object : MessageComposerView.Callback {
+        composer.callback = object : PlainTextComposerLayout.Callback {
             override fun onAddAttachment() {
                 if (!::attachmentTypeSelector.isInitialized) {
                     attachmentTypeSelector = AttachmentTypeSelectorView(vectorBaseActivity, vectorBaseActivity.layoutInflater, this@MessageComposerFragment)
@@ -286,15 +304,15 @@ class MessageComposerFragment : VectorBaseFragment<FragmentComposerBinding>(), A
                             vectorFeatures.isVoiceBroadcastEnabled(), // TODO check user permission
                     )
                 }
-                attachmentTypeSelector.show(views.composerLayout.views.attachmentButton)
+                attachmentTypeSelector.show(composer.attachmentButton)
             }
 
             override fun onExpandOrCompactChange() {
-                views.composerLayout.views.composerEmojiButton.isVisible = isEmojiKeyboardVisible
+                composer.emojiButton?.isVisible = isEmojiKeyboardVisible
             }
 
             override fun onSendMessage(text: CharSequence) {
-                sendTextMessage(text)
+                sendTextMessage(text, composer.formattedText)
             }
 
             override fun onCloseRelatedMessage() {
@@ -311,16 +329,20 @@ class MessageComposerFragment : VectorBaseFragment<FragmentComposerBinding>(), A
         }
     }
 
-    private fun sendTextMessage(text: CharSequence) {
+    private fun sendTextMessage(text: CharSequence, formattedText: String? = null) {
         if (lockSendButton) {
             Timber.w("Send button is locked")
             return
         }
         if (text.isNotBlank()) {
             // We collapse ASAP, if not there will be a slight annoying delay
-            views.composerLayout.collapse(true)
+            composer.collapse(true)
             lockSendButton = true
-            messageComposerViewModel.handle(MessageComposerAction.SendMessage(text, vectorPreferences.isMarkdownEnabled()))
+            if (formattedText != null) {
+                messageComposerViewModel.handle(MessageComposerAction.SendMessage(text, formattedText, false))
+            } else {
+                messageComposerViewModel.handle(MessageComposerAction.SendMessage(text, null, vectorPreferences.isMarkdownEnabled()))
+            }
             emojiPopup.dismiss()
         }
     }
@@ -336,22 +358,22 @@ class MessageComposerFragment : VectorBaseFragment<FragmentComposerBinding>(), A
         return isHandled
     }
 
-    private fun renderRegularMode(content: String) {
+    private fun renderRegularMode(content: CharSequence) {
         autoCompleter.exitSpecialMode()
-        views.composerLayout.collapse()
+        composer.collapse()
-        views.composerLayout.setTextIfDifferent(content)
+        composer.setTextIfDifferent(content)
-        views.composerLayout.views.sendButton.contentDescription = getString(R.string.action_send)
+        composer.sendButton.contentDescription = getString(R.string.action_send)
     }
 
     private fun renderSpecialMode(
             event: TimelineEvent,
             @DrawableRes iconRes: Int,
             @StringRes descriptionRes: Int,
-            defaultContent: String
+            defaultContent: CharSequence,
     ) {
         autoCompleter.enterSpecialMode()
         // switch to expanded bar
-        views.composerLayout.views.composerRelatedMessageTitle.apply {
+        composer.composerRelatedMessageTitle.apply {
             text = event.senderInfo.disambiguatedDisplayName
             setTextColor(matrixItemColorProvider.getColor(MatrixItem.UserItem(event.root.senderId ?: "@")))
         }
@@ -369,32 +391,32 @@ class MessageComposerFragment : VectorBaseFragment<FragmentComposerBinding>(), A
             val document = parser.parse(messageContent.formattedBody ?: messageContent.body)
             formattedBody = eventHtmlRenderer.render(document, pillsPostProcessor)
         }
-        views.composerLayout.views.composerRelatedMessageContent.text = (formattedBody ?: nonFormattedBody)
+        composer.composerRelatedMessageContent.text = (formattedBody ?: nonFormattedBody)
 
         // Image Event
         val data = event.buildImageContentRendererData(dimensionConverter.dpToPx(66))
         val isImageVisible = if (data != null) {
-            imageContentRenderer.render(data, ImageContentRenderer.Mode.THUMBNAIL, views.composerLayout.views.composerRelatedMessageImage)
+            imageContentRenderer.render(data, ImageContentRenderer.Mode.THUMBNAIL, composer.composerRelatedMessageImage)
             true
         } else {
-            imageContentRenderer.clear(views.composerLayout.views.composerRelatedMessageImage)
+            imageContentRenderer.clear(composer.composerRelatedMessageImage)
             false
         }
 
-        views.composerLayout.views.composerRelatedMessageImage.isVisible = isImageVisible
+        composer.composerRelatedMessageImage.isVisible = isImageVisible
 
-        views.composerLayout.setTextIfDifferent(defaultContent)
+        composer.replaceFormattedContent(defaultContent)
 
-        views.composerLayout.views.composerRelatedMessageActionIcon.setImageDrawable(ContextCompat.getDrawable(requireContext(), iconRes))
+        composer.composerRelatedMessageActionIcon.setImageDrawable(ContextCompat.getDrawable(requireContext(), iconRes))
-        views.composerLayout.views.sendButton.contentDescription = getString(descriptionRes)
+        composer.sendButton.contentDescription = getString(descriptionRes)
 
-        avatarRenderer.render(event.senderInfo.toMatrixItem(), views.composerLayout.views.composerRelatedMessageAvatar)
+        avatarRenderer.render(event.senderInfo.toMatrixItem(), composer.composerRelatedMessageAvatar)
 
-        views.composerLayout.expand {
+        composer.expand {
             if (isAdded) {
                 // need to do it here also when not using quick reply
                 focusComposerAndShowKeyboard()
-                views.composerLayout.views.composerRelatedMessageImage.isVisible = isImageVisible
+                composer.composerRelatedMessageImage.isVisible = isImageVisible
             }
         }
         focusComposerAndShowKeyboard()
@@ -402,7 +424,7 @@ class MessageComposerFragment : VectorBaseFragment<FragmentComposerBinding>(), A
 
     private fun observerUserTyping() {
         if (isThreadTimeLine()) return
-        views.composerLayout.views.composerEditText.textChanges()
+        composer.editText.textChanges()
                 .skipInitialValue()
                 .debounce(300)
                 .map { it.isNotEmpty() }
@@ -412,7 +434,7 @@ class MessageComposerFragment : VectorBaseFragment<FragmentComposerBinding>(), A
                 }
                 .launchIn(viewLifecycleOwner.lifecycleScope)
 
-        views.composerLayout.views.composerEditText.focusChanges()
+        composer.editText.focusChanges()
                 .onEach {
                     timelineViewModel.handle(RoomDetailAction.ComposerFocusChange(it))
                 }
@@ -420,18 +442,18 @@ class MessageComposerFragment : VectorBaseFragment<FragmentComposerBinding>(), A
     }
 
     private fun focusComposerAndShowKeyboard() {
-        if (views.composerLayout.isVisible) {
+        if (composer.isVisible) {
-            views.composerLayout.views.composerEditText.showKeyboard(andRequestFocus = true)
+            composer.editText.showKeyboard(andRequestFocus = true)
         }
     }
 
     private fun handleSendButtonVisibilityChanged(event: MessageComposerViewEvents.AnimateSendButtonVisibility) {
         if (event.isVisible) {
-            views.root.views.sendButton.alpha = 0f
+            composer.sendButton.alpha = 0f
-            views.root.views.sendButton.isVisible = true
+            composer.sendButton.isVisible = true
-            views.root.views.sendButton.animate().alpha(1f).setDuration(150).start()
+            composer.sendButton.animate().alpha(1f).setDuration(150).start()
         } else {
-            views.root.views.sendButton.isInvisible = true
+            composer.sendButton.isInvisible = true
         }
     }
 
@@ -455,18 +477,18 @@ class MessageComposerFragment : VectorBaseFragment<FragmentComposerBinding>(), A
                 rootView = views.root,
                 keyboardAnimationStyle = R.style.emoji_fade_animation_style,
                 onEmojiPopupShownListener = {
-                    views.composerLayout.views.composerEmojiButton.apply {
+                    composer.emojiButton?.apply {
                         contentDescription = getString(R.string.a11y_close_emoji_picker)
                         setImageResource(R.drawable.ic_keyboard)
                     }
                 },
                 onEmojiPopupDismissListener = lifecycleAwareDismissAction {
-                    views.composerLayout.views.composerEmojiButton.apply {
+                    composer.emojiButton?.apply {
                         contentDescription = getString(R.string.a11y_open_emoji_picker)
                         setImageResource(R.drawable.ic_insert_emoji)
                     }
                 },
-                editText = views.composerLayout.views.composerEditText
+                editText = composer.editText
         )
     }
 
@@ -483,7 +505,7 @@ class MessageComposerFragment : VectorBaseFragment<FragmentComposerBinding>(), A
     }
 
     private fun setupEmojiButton() {
-        views.composerLayout.views.composerEmojiButton.debouncedClicks {
+        composer.emojiButton?.debouncedClicks {
             emojiPopup.toggle()
         }
     }
@@ -494,7 +516,7 @@ class MessageComposerFragment : VectorBaseFragment<FragmentComposerBinding>(), A
     }
 
     private fun handleJoinedToAnotherRoom(action: MessageComposerViewEvents.JoinRoomCommandSuccess) {
-        views.composerLayout.setTextIfDifferent("")
+        composer.setTextIfDifferent("")
         lockSendButton = false
         navigator.openRoom(vectorBaseActivity, action.roomId)
     }
@@ -549,7 +571,7 @@ class MessageComposerFragment : VectorBaseFragment<FragmentComposerBinding>(), A
 
     private fun handleSlashCommandResultOk(parsedCommand: ParsedCommand) {
         dismissLoadingDialog()
-        views.composerLayout.setTextIfDifferent("")
+        composer.setTextIfDifferent("")
         when (parsedCommand) {
             is ParsedCommand.DevTools -> {
                 navigator.openDevTools(requireContext(), roomId)
@@ -608,7 +630,7 @@ class MessageComposerFragment : VectorBaseFragment<FragmentComposerBinding>(), A
 
     override fun onContactAttachmentReady(contactAttachment: ContactAttachment) {
         val formattedContact = contactAttachment.toHumanReadable()
-        messageComposerViewModel.handle(MessageComposerAction.SendMessage(formattedContact, false))
+        messageComposerViewModel.handle(MessageComposerAction.SendMessage(formattedContact, null, false))
     }
 
     override fun onAttachmentError(throwable: Throwable) {
@@ -718,13 +740,13 @@ class MessageComposerFragment : VectorBaseFragment<FragmentComposerBinding>(), A
 
     @SuppressLint("SetTextI18n")
     private fun insertUserDisplayNameInTextEditor(userId: String) {
-        val startToCompose = views.composerLayout.text.isNullOrBlank()
+        val startToCompose = composer.text.isNullOrBlank()
 
         if (startToCompose &&
                 userId == session.myUserId) {
             // Empty composer, current user: start an emote
-            views.composerLayout.views.composerEditText.setText("${Command.EMOTE.command} ")
+            composer.editText.setText("${Command.EMOTE.command} ")
-            views.composerLayout.views.composerEditText.setSelection(Command.EMOTE.command.length + 1)
+            composer.editText.setSelection(Command.EMOTE.command.length + 1)
         } else {
             val roomMember = timelineViewModel.getMember(userId)
             val displayName = sanitizeDisplayName(roomMember?.displayName ?: userId)
@@ -737,7 +759,7 @@ class MessageComposerFragment : VectorBaseFragment<FragmentComposerBinding>(), A
                                 requireContext(),
                                 MatrixItem.UserItem(userId, displayName, roomMember?.avatarUrl)
                         )
-                                .also { it.bind(views.composerLayout.views.composerEditText) },
+                                .also { it.bind(composer.editText) },
                         0,
                         displayName.length,
                         Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
@@ -747,11 +769,11 @@ class MessageComposerFragment : VectorBaseFragment<FragmentComposerBinding>(), A
             if (startToCompose) {
                 if (displayName.startsWith("/")) {
                     // Ensure displayName will not be interpreted as a Slash command
-                    views.composerLayout.views.composerEditText.append("\\")
+                    composer.editText.append("\\")
                 }
-                views.composerLayout.views.composerEditText.append(pill)
+                composer.editText.append(pill)
             } else {
-                views.composerLayout.views.composerEditText.text?.insert(views.composerLayout.views.composerEditText.selectionStart, pill)
+                composer.editText.text?.insert(composer.editText.selectionStart, pill)
             }
         }
         focusComposerAndShowKeyboard()

vector/src/main/java/im/vector/app/features/home/room/detail/composer/MessageComposerView.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2019 New Vector Ltd
+ * Copyright (c) 2022 New Vector Ltd
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,137 +16,34 @@
 
 package im.vector.app.features.home.room.detail.composer
 
-import android.content.Context
-import android.net.Uri
 import android.text.Editable
-import android.util.AttributeSet
+import android.widget.EditText
-import android.view.ViewGroup
+import android.widget.ImageButton
-import androidx.constraintlayout.widget.ConstraintLayout
+import android.widget.ImageView
-import androidx.constraintlayout.widget.ConstraintSet
+import android.widget.TextView
-import androidx.core.text.toSpannable
-import androidx.transition.ChangeBounds
-import androidx.transition.Fade
-import androidx.transition.Transition
-import androidx.transition.TransitionManager
-import androidx.transition.TransitionSet
-import im.vector.app.R
-import im.vector.app.core.extensions.setTextIfDifferent
-import im.vector.app.databinding.ComposerLayoutBinding
 
-/**
+interface MessageComposerView {
- * Encapsulate the timeline composer UX.
- */
-class MessageComposerView @JvmOverloads constructor(
-        context: Context,
-        attrs: AttributeSet? = null,
-        defStyleAttr: Int = 0
-) : ConstraintLayout(context, attrs, defStyleAttr) {
-
-    interface Callback : ComposerEditText.Callback {
-        fun onCloseRelatedMessage()
-        fun onSendMessage(text: CharSequence)
-        fun onAddAttachment()
-        fun onExpandOrCompactChange()
-    }
-
-    val views: ComposerLayoutBinding
-
-    var callback: Callback? = null
-
-    private var currentConstraintSetId: Int = -1
-
-    private val animationDuration = 100L
 
     val text: Editable?
-        get() = views.composerEditText.text
+    val formattedText: String?
+    val editText: EditText
+    val emojiButton: ImageButton?
+    val sendButton: ImageButton
+    val attachmentButton: ImageButton
+    val composerRelatedMessageTitle: TextView
+    val composerRelatedMessageContent: TextView
+    val composerRelatedMessageImage: ImageView
+    val composerRelatedMessageActionIcon: ImageView
+    val composerRelatedMessageAvatar: ImageView
 
-    init {
+    var callback: PlainTextComposerLayout.Callback?
-        inflate(context, R.layout.composer_layout, this)
-        views = ComposerLayoutBinding.bind(this)
 
-        collapse(false)
+    var isVisible: Boolean
 
-        views.composerEditText.callback = object : ComposerEditText.Callback {
+    fun collapse(animate: Boolean = true, transitionComplete: (() -> Unit)? = null)
-            override fun onRichContentSelected(contentUri: Uri): Boolean {
+    fun expand(animate: Boolean = true, transitionComplete: (() -> Unit)? = null)
-                return callback?.onRichContentSelected(contentUri) ?: false
+    fun setTextIfDifferent(text: CharSequence?): Boolean
-            }
+    fun replaceFormattedContent(text: CharSequence)
 
-            override fun onTextChanged(text: CharSequence) {
+    fun setInvisible(isInvisible: Boolean)
-                callback?.onTextChanged(text)
-            }
-        }
-        views.composerRelatedMessageCloseButton.setOnClickListener {
-            collapse()
-            callback?.onCloseRelatedMessage()
-        }
-
-        views.sendButton.setOnClickListener {
-            val textMessage = text?.toSpannable() ?: ""
-            callback?.onSendMessage(textMessage)
-        }
-
-        views.attachmentButton.setOnClickListener {
-            callback?.onAddAttachment()
-        }
-    }
-
-    fun collapse(animate: Boolean = true, transitionComplete: (() -> Unit)? = null) {
-        if (currentConstraintSetId == R.layout.composer_layout_constraint_set_compact) {
-            // ignore we good
-            return
-        }
-        currentConstraintSetId = R.layout.composer_layout_constraint_set_compact
-        applyNewConstraintSet(animate, transitionComplete)
-        callback?.onExpandOrCompactChange()
-    }
-
-    fun expand(animate: Boolean = true, transitionComplete: (() -> Unit)? = null) {
-        if (currentConstraintSetId == R.layout.composer_layout_constraint_set_expanded) {
-            // ignore we good
-            return
-        }
-        currentConstraintSetId = R.layout.composer_layout_constraint_set_expanded
-        applyNewConstraintSet(animate, transitionComplete)
-        callback?.onExpandOrCompactChange()
-    }
-
-    fun setTextIfDifferent(text: CharSequence?): Boolean {
-        return views.composerEditText.setTextIfDifferent(text)
-    }
-
-    private fun applyNewConstraintSet(animate: Boolean, transitionComplete: (() -> Unit)?) {
-        // val wasSendButtonInvisible = views.sendButton.isInvisible
-        if (animate) {
-            configureAndBeginTransition(transitionComplete)
-        }
-        ConstraintSet().also {
-            it.clone(context, currentConstraintSetId)
-            it.applyTo(this)
-        }
-        // Might be updated by view state just after, but avoid blinks
-        // views.sendButton.isInvisible = wasSendButtonInvisible
-    }
-
-    private fun configureAndBeginTransition(transitionComplete: (() -> Unit)? = null) {
-        val transition = TransitionSet().apply {
-            ordering = TransitionSet.ORDERING_SEQUENTIAL
-            addTransition(ChangeBounds())
-            addTransition(Fade(Fade.IN))
-            duration = animationDuration
-            addListener(object : Transition.TransitionListener {
-                override fun onTransitionEnd(transition: Transition) {
-                    transitionComplete?.invoke()
-                }
-
-                override fun onTransitionResume(transition: Transition) {}
-
-                override fun onTransitionPause(transition: Transition) {}
-
-                override fun onTransitionCancel(transition: Transition) {}
-
-                override fun onTransitionStart(transition: Transition) {}
-            })
-        }
-        TransitionManager.beginDelayedTransition((parent as? ViewGroup ?: this), transition)
-    }
 }

vector/src/main/java/im/vector/app/features/home/room/detail/composer/MessageComposerViewModel.kt

@@ -59,6 +59,7 @@ import org.matrix.android.sdk.api.session.room.model.PowerLevelsContent
 import org.matrix.android.sdk.api.session.room.model.RoomAvatarContent
 import org.matrix.android.sdk.api.session.room.model.RoomEncryptionAlgorithm
 import org.matrix.android.sdk.api.session.room.model.RoomMemberContent
+import org.matrix.android.sdk.api.session.room.model.message.MessageContentWithFormattedBody
 import org.matrix.android.sdk.api.session.room.model.message.MessageType
 import org.matrix.android.sdk.api.session.room.model.relation.shouldRenderInThread
 import org.matrix.android.sdk.api.session.room.powerlevels.PowerLevelsHelper
@@ -201,6 +202,7 @@ class MessageComposerViewModel @AssistedInject constructor(
                 is SendMode.Regular -> {
                     when (val parsedCommand = commandParser.parseSlashCommand(
                             textMessage = action.text,
+                            formattedMessage = action.formattedText,
                             isInThreadTimeline = state.isInThreadTimeline()
                     )) {
                         is ParsedCommand.ErrorNotACommand -> {
@@ -209,11 +211,16 @@ class MessageComposerViewModel @AssistedInject constructor(
                                 room.relationService().replyInThread(
                                         rootThreadEventId = state.rootThreadEventId,
                                         replyInThreadText = action.text,
+                                        formattedText = action.formattedText,
                                         autoMarkdown = action.autoMarkdown
                                 )
+                            } else {
+                                if (action.formattedText != null) {
+                                    room.sendService().sendFormattedTextMessage(action.text.toString(), action.formattedText)
                                 } else {
                                     room.sendService().sendTextMessage(action.text, autoMarkdown = action.autoMarkdown)
                                 }
+                            }
 
                             _viewEvents.post(MessageComposerViewEvents.MessageSent)
                             popDraft()
@@ -244,6 +251,24 @@ class MessageComposerViewModel @AssistedInject constructor(
                             _viewEvents.post(MessageComposerViewEvents.MessageSent)
                             popDraft()
                         }
+                        is ParsedCommand.SendFormattedText -> {
+                            // Send the text message to the room, without markdown
+                            if (state.rootThreadEventId != null) {
+                                room.relationService().replyInThread(
+                                        rootThreadEventId = state.rootThreadEventId,
+                                        replyInThreadText = parsedCommand.message,
+                                        formattedText = parsedCommand.formattedMessage,
+                                        autoMarkdown = false
+                                )
+                            } else {
+                                room.sendService().sendFormattedTextMessage(
+                                        text = parsedCommand.message.toString(),
+                                        formattedText = parsedCommand.formattedMessage
+                                )
+                            }
+                            _viewEvents.post(MessageComposerViewEvents.MessageSent)
+                            popDraft()
+                        }
                         is ParsedCommand.ChangeRoomName -> {
                             handleChangeRoomNameSlashCommand(parsedCommand)
                         }
@@ -510,16 +535,24 @@ class MessageComposerViewModel @AssistedInject constructor(
                     if (inReplyTo != null) {
                         // TODO check if same content?
                         room.getTimelineEvent(inReplyTo)?.let {
-                            room.relationService().editReply(state.sendMode.timelineEvent, it, action.text.toString())
+                            room.relationService().editReply(state.sendMode.timelineEvent, it, action.text.toString(), action.formattedText)
                         }
                     } else {
                         val messageContent = state.sendMode.timelineEvent.getVectorLastMessageContent()
-                        val existingBody = messageContent?.body ?: ""
+                        val existingBody: String
-                        if (existingBody != action.text) {
+                        val needsEdit = if (messageContent is MessageContentWithFormattedBody) {
+                            existingBody = messageContent.formattedBody ?: ""
+                            existingBody != action.formattedText
+                        } else {
+                            existingBody = messageContent?.body ?: ""
+                            existingBody != action.text
+                        }
+                        if (needsEdit) {
                             room.relationService().editTextMessage(
                                     state.sendMode.timelineEvent,
                                     messageContent?.msgType ?: MessageType.MSGTYPE_TEXT,
                                     action.text,
+                                    (messageContent as? MessageContentWithFormattedBody)?.formattedBody,
                                     action.autoMarkdown
                             )
                         } else {
@@ -533,6 +566,7 @@ class MessageComposerViewModel @AssistedInject constructor(
                     room.sendService().sendQuotedTextMessage(
                             quotedEvent = state.sendMode.timelineEvent,
                             text = action.text.toString(),
+                            formattedText = action.formattedText,
                             autoMarkdown = action.autoMarkdown,
                             rootThreadEventId = state.rootThreadEventId
                     )
@@ -549,11 +583,13 @@ class MessageComposerViewModel @AssistedInject constructor(
                                 rootThreadEventId = it,
                                 replyInThreadText = action.text.toString(),
                                 autoMarkdown = action.autoMarkdown,
+                                formattedText = action.formattedText,
                                 eventReplied = timelineEvent
                         )
                     } ?: room.relationService().replyToMessage(
                             eventReplied = timelineEvent,
                             replyText = action.text.toString(),
+                            replyFormattedText = action.formattedText,
                             autoMarkdown = action.autoMarkdown,
                             showInThread = showInThread,
                             rootThreadEventId = rootThreadEventId

vector/src/main/java/im/vector/app/features/home/room/detail/composer/PlainTextComposerLayout.kt

@@ -0,0 +1,185 @@
+/*
+ * Copyright 2019 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.app.features.home.room.detail.composer
+
+import android.content.Context
+import android.net.Uri
+import android.text.Editable
+import android.util.AttributeSet
+import android.view.ViewGroup
+import android.widget.EditText
+import android.widget.ImageButton
+import android.widget.ImageView
+import android.widget.TextView
+import androidx.constraintlayout.widget.ConstraintLayout
+import androidx.constraintlayout.widget.ConstraintSet
+import androidx.core.text.toSpannable
+import androidx.core.view.isInvisible
+import androidx.core.view.isVisible
+import androidx.transition.ChangeBounds
+import androidx.transition.Fade
+import androidx.transition.Transition
+import androidx.transition.TransitionManager
+import androidx.transition.TransitionSet
+import im.vector.app.R
+import im.vector.app.core.animations.SimpleTransitionListener
+import im.vector.app.core.extensions.setTextIfDifferent
+import im.vector.app.databinding.ComposerLayoutBinding
+
+/**
+ * Encapsulate the timeline composer UX.
+ */
+class PlainTextComposerLayout @JvmOverloads constructor(
+        context: Context,
+        attrs: AttributeSet? = null,
+        defStyleAttr: Int = 0
+) : ConstraintLayout(context, attrs, defStyleAttr), MessageComposerView {
+
+    interface Callback : ComposerEditText.Callback {
+        fun onCloseRelatedMessage()
+        fun onSendMessage(text: CharSequence)
+        fun onAddAttachment()
+        fun onExpandOrCompactChange()
+    }
+
+    private val views: ComposerLayoutBinding
+
+    override var callback: Callback? = null
+
+    private var currentConstraintSetId: Int = -1
+
+    private val animationDuration = 100L
+
+    override val text: Editable?
+        get() = views.composerEditText.text
+
+    override val formattedText: String? = null
+
+    override val editText: EditText
+        get() = views.composerEditText
+
+    override val emojiButton: ImageButton?
+        get() = views.composerEmojiButton
+
+    override val sendButton: ImageButton
+        get() = views.sendButton
+
+    override fun setInvisible(isInvisible: Boolean) {
+        this.isInvisible = isInvisible
+    }
+    override val attachmentButton: ImageButton
+        get() = views.attachmentButton
+    override val composerRelatedMessageActionIcon: ImageView
+        get() = views.composerRelatedMessageActionIcon
+    override val composerRelatedMessageAvatar: ImageView
+        get() = views.composerRelatedMessageAvatar
+    override val composerRelatedMessageContent: TextView
+        get() = views.composerRelatedMessageContent
+    override val composerRelatedMessageImage: ImageView
+        get() = views.composerRelatedMessageImage
+    override val composerRelatedMessageTitle: TextView
+        get() = views.composerRelatedMessageTitle
+    override var isVisible: Boolean
+        get() = views.root.isVisible
+        set(value) { views.root.isVisible = value }
+
+    init {
+        inflate(context, R.layout.composer_layout, this)
+        views = ComposerLayoutBinding.bind(this)
+
+        collapse(false)
+
+        views.composerEditText.callback = object : ComposerEditText.Callback {
+            override fun onRichContentSelected(contentUri: Uri): Boolean {
+                return callback?.onRichContentSelected(contentUri) ?: false
+            }
+
+            override fun onTextChanged(text: CharSequence) {
+                callback?.onTextChanged(text)
+            }
+        }
+        views.composerRelatedMessageCloseButton.setOnClickListener {
+            collapse()
+            callback?.onCloseRelatedMessage()
+        }
+
+        views.sendButton.setOnClickListener {
+            val textMessage = text?.toSpannable() ?: ""
+            callback?.onSendMessage(textMessage)
+        }
+
+        views.attachmentButton.setOnClickListener {
+            callback?.onAddAttachment()
+        }
+    }
+
+    override fun replaceFormattedContent(text: CharSequence) {
+        setTextIfDifferent(text)
+    }
+
+    override fun collapse(animate: Boolean, transitionComplete: (() -> Unit)?) {
+        if (currentConstraintSetId == R.layout.composer_layout_constraint_set_compact) {
+            // ignore we good
+            return
+        }
+        currentConstraintSetId = R.layout.composer_layout_constraint_set_compact
+        applyNewConstraintSet(animate, transitionComplete)
+        callback?.onExpandOrCompactChange()
+    }
+
+    override fun expand(animate: Boolean, transitionComplete: (() -> Unit)?) {
+        if (currentConstraintSetId == R.layout.composer_layout_constraint_set_expanded) {
+            // ignore we good
+            return
+        }
+        currentConstraintSetId = R.layout.composer_layout_constraint_set_expanded
+        applyNewConstraintSet(animate, transitionComplete)
+        callback?.onExpandOrCompactChange()
+    }
+
+    override fun setTextIfDifferent(text: CharSequence?): Boolean {
+        return views.composerEditText.setTextIfDifferent(text)
+    }
+
+    private fun applyNewConstraintSet(animate: Boolean, transitionComplete: (() -> Unit)?) {
+        // val wasSendButtonInvisible = views.sendButton.isInvisible
+        if (animate) {
+            configureAndBeginTransition(transitionComplete)
+        }
+        ConstraintSet().also {
+            it.clone(context, currentConstraintSetId)
+            it.applyTo(this)
+        }
+        // Might be updated by view state just after, but avoid blinks
+        // views.sendButton.isInvisible = wasSendButtonInvisible
+    }
+
+    private fun configureAndBeginTransition(transitionComplete: (() -> Unit)? = null) {
+        val transition = TransitionSet().apply {
+            ordering = TransitionSet.ORDERING_SEQUENTIAL
+            addTransition(ChangeBounds())
+            addTransition(Fade(Fade.IN))
+            duration = animationDuration
+            addListener(object : SimpleTransitionListener() {
+                override fun onTransitionEnd(transition: Transition) {
+                    transitionComplete?.invoke()
+                }
+            })
+        }
+        TransitionManager.beginDelayedTransition((parent as? ViewGroup ?: this), transition)
+    }
+}

vector/src/main/java/im/vector/app/features/home/room/detail/composer/RichTextComposerLayout.kt

@@ -0,0 +1,202 @@
+/*
+ * Copyright (c) 2022 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.app.features.home.room.detail.composer
+
+import android.content.Context
+import android.text.Editable
+import android.text.TextWatcher
+import android.util.AttributeSet
+import android.view.LayoutInflater
+import android.view.ViewGroup
+import android.widget.EditText
+import android.widget.ImageButton
+import android.widget.ImageView
+import android.widget.TextView
+import androidx.annotation.DrawableRes
+import androidx.constraintlayout.widget.ConstraintLayout
+import androidx.constraintlayout.widget.ConstraintSet
+import androidx.core.text.toSpannable
+import androidx.core.view.isInvisible
+import androidx.core.view.isVisible
+import androidx.transition.ChangeBounds
+import androidx.transition.Fade
+import androidx.transition.Transition
+import androidx.transition.TransitionManager
+import androidx.transition.TransitionSet
+import im.vector.app.R
+import im.vector.app.core.animations.SimpleTransitionListener
+import im.vector.app.core.extensions.setTextIfDifferent
+import im.vector.app.databinding.ComposerRichTextLayoutBinding
+import im.vector.app.databinding.ViewRichTextMenuButtonBinding
+import io.element.android.wysiwyg.InlineFormat
+
+class RichTextComposerLayout @JvmOverloads constructor(
+        context: Context,
+        attrs: AttributeSet? = null,
+        defStyleAttr: Int = 0
+) : ConstraintLayout(context, attrs, defStyleAttr), MessageComposerView {
+
+    private val views: ComposerRichTextLayoutBinding
+
+    override var callback: PlainTextComposerLayout.Callback? = null
+
+    private var currentConstraintSetId: Int = -1
+
+    private val animationDuration = 100L
+
+    override val text: Editable?
+        get() = views.composerEditText.text
+    override val formattedText: String?
+        get() = views.composerEditText.getHtmlOutput()
+    override val editText: EditText
+        get() = views.composerEditText
+    override val emojiButton: ImageButton?
+        get() = null
+    override val sendButton: ImageButton
+        get() = views.sendButton
+    override val attachmentButton: ImageButton
+        get() = views.attachmentButton
+    override val composerRelatedMessageActionIcon: ImageView
+        get() = views.composerRelatedMessageActionIcon
+    override val composerRelatedMessageAvatar: ImageView
+        get() = views.composerRelatedMessageAvatar
+    override val composerRelatedMessageContent: TextView
+        get() = views.composerRelatedMessageContent
+    override val composerRelatedMessageImage: ImageView
+        get() = views.composerRelatedMessageImage
+    override val composerRelatedMessageTitle: TextView
+        get() = views.composerRelatedMessageTitle
+    override var isVisible: Boolean
+        get() = views.root.isVisible
+        set(value) { views.root.isVisible = value }
+
+    init {
+        inflate(context, R.layout.composer_rich_text_layout, this)
+        views = ComposerRichTextLayoutBinding.bind(this)
+
+        collapse(false)
+
+        views.composerEditText.addTextChangedListener(object : TextWatcher {
+            override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {}
+            override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {}
+            override fun afterTextChanged(s: Editable) {
+                callback?.onTextChanged(s)
+            }
+        })
+
+        views.composerRelatedMessageCloseButton.setOnClickListener {
+            collapse()
+            callback?.onCloseRelatedMessage()
+        }
+
+        views.sendButton.setOnClickListener {
+            val textMessage = text?.toSpannable() ?: ""
+            callback?.onSendMessage(textMessage)
+        }
+
+        views.attachmentButton.setOnClickListener {
+            callback?.onAddAttachment()
+        }
+
+        setupRichTextMenu()
+    }
+
+    private fun setupRichTextMenu() {
+        addRichTextMenuItem(R.drawable.ic_composer_bold, "Bold") {
+            views.composerEditText.toggleInlineFormat(InlineFormat.Bold)
+        }
+        addRichTextMenuItem(R.drawable.ic_composer_italic, "Italic") {
+            views.composerEditText.toggleInlineFormat(InlineFormat.Italic)
+        }
+        addRichTextMenuItem(R.drawable.ic_composer_underlined, "Underline") {
+            views.composerEditText.toggleInlineFormat(InlineFormat.Underline)
+        }
+        addRichTextMenuItem(R.drawable.ic_composer_strikethrough, "Strikethrough") {
+            views.composerEditText.toggleInlineFormat(InlineFormat.StrikeThrough)
+        }
+    }
+
+    private fun addRichTextMenuItem(@DrawableRes iconId: Int, description: String, action: () -> Unit) {
+        val inflater = LayoutInflater.from(context)
+        val button = ViewRichTextMenuButtonBinding.inflate(inflater, views.richTextMenu, true)
+        with(button.root) {
+            contentDescription = description
+            setImageResource(iconId)
+            setOnClickListener {
+                action()
+            }
+        }
+    }
+
+    override fun replaceFormattedContent(text: CharSequence) {
+        views.composerEditText.setHtml(text.toString())
+    }
+
+    override fun collapse(animate: Boolean, transitionComplete: (() -> Unit)?) {
+        if (currentConstraintSetId == R.layout.composer_rich_text_layout_constraint_set_compact) {
+            // ignore we good
+            return
+        }
+        currentConstraintSetId = R.layout.composer_rich_text_layout_constraint_set_compact
+        applyNewConstraintSet(animate, transitionComplete)
+    }
+
+    override fun expand(animate: Boolean, transitionComplete: (() -> Unit)?) {
+        if (currentConstraintSetId == R.layout.composer_rich_text_layout_constraint_set_expanded) {
+            // ignore we good
+            return
+        }
+        currentConstraintSetId = R.layout.composer_rich_text_layout_constraint_set_expanded
+        applyNewConstraintSet(animate, transitionComplete)
+    }
+
+    override fun setTextIfDifferent(text: CharSequence?): Boolean {
+        return views.composerEditText.setTextIfDifferent(text)
+    }
+
+    private fun applyNewConstraintSet(animate: Boolean, transitionComplete: (() -> Unit)?) {
+        // val wasSendButtonInvisible = views.sendButton.isInvisible
+        if (animate) {
+            configureAndBeginTransition(transitionComplete)
+        }
+        ConstraintSet().also {
+            it.clone(context, currentConstraintSetId)
+            it.applyTo(this)
+        }
+        // Might be updated by view state just after, but avoid blinks
+        // views.sendButton.isInvisible = wasSendButtonInvisible
+    }
+
+    private fun configureAndBeginTransition(transitionComplete: (() -> Unit)? = null) {
+        val transition = TransitionSet().apply {
+            ordering = TransitionSet.ORDERING_SEQUENTIAL
+            addTransition(ChangeBounds())
+            addTransition(Fade(Fade.IN))
+            duration = animationDuration
+            addListener(object : SimpleTransitionListener() {
+                override fun onTransitionEnd(transition: Transition) {
+                    transitionComplete?.invoke()
+                }
+            })
+        }
+        TransitionManager.beginDelayedTransition((parent as? ViewGroup ?: this), transition)
+    }
+
+    override fun setInvisible(isInvisible: Boolean) {
+        this.isInvisible = isInvisible
+    }
+}

vector/src/main/java/im/vector/app/features/home/room/detail/composer/voice/VoiceRecorderFragment.kt

@@ -37,6 +37,9 @@ import im.vector.app.features.home.room.detail.TimelineViewModel
 import im.vector.app.features.home.room.detail.composer.MessageComposerAction
 import im.vector.app.features.home.room.detail.composer.MessageComposerViewEvents
 import im.vector.app.features.home.room.detail.composer.MessageComposerViewModel
+import im.vector.app.features.home.room.detail.composer.MessageComposerViewState
+import im.vector.app.features.home.room.detail.composer.SendMode
+import im.vector.app.features.home.room.detail.composer.boolean
 import im.vector.app.features.home.room.detail.timeline.helper.AudioMessagePlaybackTracker
 import javax.inject.Inject
 
@@ -70,6 +73,15 @@ class VoiceRecorderFragment : VectorBaseFragment<FragmentVoiceRecorderBinding>()
                 else -> Unit
             }
         }
+
+        messageComposerViewModel.onEach(MessageComposerViewState::sendMode, MessageComposerViewState::canSendMessage) { mode, canSend ->
+            if (!canSend.boolean()) {
+                return@onEach
+            }
+            if (mode is SendMode.Voice) {
+                views.voiceMessageRecorderView.isVisible = true
+            }
+        }
     }
 
     override fun onResume() {

vector/src/main/java/im/vector/app/features/settings/VectorPreferences.kt

@@ -71,6 +71,7 @@ class VectorPreferences @Inject constructor(
         const val SETTINGS_LABS_PREFERENCE_KEY = "SETTINGS_LABS_PREFERENCE_KEY"
         const val SETTINGS_LABS_NEW_APP_LAYOUT_KEY = "SETTINGS_LABS_NEW_APP_LAYOUT_KEY"
         const val SETTINGS_LABS_DEFERRED_DM_KEY = "SETTINGS_LABS_DEFERRED_DM_KEY"
+        const val SETTINGS_LABS_RICH_TEXT_EDITOR_KEY = "SETTINGS_LABS_RICH_TEXT_EDITOR_KEY"
         const val SETTINGS_CRYPTOGRAPHY_PREFERENCE_KEY = "SETTINGS_CRYPTOGRAPHY_PREFERENCE_KEY"
         const val SETTINGS_CRYPTOGRAPHY_DIVIDER_PREFERENCE_KEY = "SETTINGS_CRYPTOGRAPHY_DIVIDER_PREFERENCE_KEY"
         const val SETTINGS_CRYPTOGRAPHY_MANAGE_PREFERENCE_KEY = "SETTINGS_CRYPTOGRAPHY_MANAGE_PREFERENCE_KEY"
@@ -1182,4 +1183,8 @@ class VectorPreferences @Inject constructor(
     fun showLiveSenderInfo(): Boolean {
         return defaultPrefs.getBoolean(SETTINGS_TIMELINE_SHOW_LIVE_SENDER_INFO, getDefault(R.bool.settings_timeline_show_live_sender_info_default))
     }
+
+    fun isRichTextEditorEnabled(): Boolean {
+        return defaultPrefs.getBoolean(SETTINGS_LABS_RICH_TEXT_EDITOR_KEY, getDefault(R.bool.settings_labs_rich_text_editor_default))
+    }
 }

vector/src/main/res/drawable/ic_composer_bold.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="44dp"
+    android:height="44dp"
+    android:viewportWidth="44"
+    android:viewportHeight="44">
+  <path
+      android:pathData="M16,14.5C16,13.672 16.672,13 17.5,13H22.288C25.139,13 27.25,15.466 27.25,18.25C27.25,19.38 26.902,20.458 26.298,21.34C27.765,22.268 28.75,23.882 28.75,25.75C28.75,28.689 26.311,31 23.393,31H17.5C16.672,31 16,30.328 16,29.5V14.5ZM19,16V20.5H22.288C23.261,20.5 24.25,19.608 24.25,18.25C24.25,16.892 23.261,16 22.288,16H19ZM19,23.5V28H23.393C24.735,28 25.75,26.953 25.75,25.75C25.75,24.547 24.735,23.5 23.393,23.5H19Z"
+      android:fillColor="#8D97A5"
+      android:fillType="evenOdd"/>
+</vector>

vector/src/main/res/drawable/ic_composer_italic.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="44dp"
+    android:height="44dp"
+    android:viewportWidth="44"
+    android:viewportHeight="44">
+  <path
+      android:pathData="M22.619,14.999L19.747,29.005H17.2C16.758,29.005 16.4,29.363 16.4,29.805C16.4,30.247 16.758,30.605 17.2,30.605H20.389C20.397,30.605 20.405,30.605 20.412,30.605H23.6C24.042,30.605 24.4,30.247 24.4,29.805C24.4,29.363 24.042,29.005 23.6,29.005H21.381L24.253,14.999H26.8C27.242,14.999 27.6,14.64 27.6,14.199C27.6,13.757 27.242,13.399 26.8,13.399H23.615C23.604,13.398 23.594,13.398 23.583,13.399H20.4C19.958,13.399 19.6,13.757 19.6,14.199C19.6,14.64 19.958,14.999 20.4,14.999H22.619Z"
+      android:fillColor="#8D97A5"
+      android:fillType="evenOdd"/>
+</vector>

vector/src/main/res/drawable/ic_composer_strikethrough.xml

@@ -0,0 +1,12 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="44dp"
+    android:height="44dp"
+    android:viewportWidth="44"
+    android:viewportHeight="44">
+  <path
+      android:pathData="M24.897,17.154C24.235,15.821 22.876,15.21 21.374,15.372C19.05,15.622 18.44,17.423 18.722,18.592C19.032,19.872 20.046,20.37 21.839,20.826H29.92C30.517,20.826 31,21.351 31,22C31,22.648 30.517,23.174 29.92,23.174H14.08C13.483,23.174 13,22.648 13,22C13,21.351 13.483,20.826 14.08,20.826H17.355C17.041,20.377 16.791,19.839 16.633,19.189C16.003,16.581 17.554,13.424 21.16,13.036C23.285,12.807 25.615,13.661 26.798,16.038C27.081,16.608 26.886,17.32 26.361,17.629C25.836,17.937 25.181,17.725 24.897,17.154Z"
+      android:fillColor="#8D97A5"/>
+  <path
+      android:pathData="M25.427,25.13H27.67C27.888,26.306 27.721,27.56 27.05,28.632C26.114,30.125 24.37,31 21.985,31C18.076,31 16.279,28.584 15.912,26.986C15.768,26.357 16.12,25.72 16.698,25.563C17.277,25.406 17.863,25.788 18.008,26.417C18.119,26.902 19.002,28.652 21.985,28.652C23.907,28.652 24.854,27.965 25.264,27.31C25.642,26.707 25.708,25.909 25.427,25.13Z"
+      android:fillColor="#8D97A5"/>
+</vector>

vector/src/main/res/drawable/ic_composer_underlined.xml

@@ -0,0 +1,13 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="44dp"
+    android:height="44dp"
+    android:viewportWidth="44"
+    android:viewportHeight="44">
+  <group>
+    <clip-path
+        android:pathData="M10,10h24v24h-24z"/>
+    <path
+        android:pathData="M22.79,26.95C25.82,26.56 28,23.84 28,20.79V14.25C28,13.56 27.44,13 26.75,13C26.06,13 25.5,13.56 25.5,14.25V20.9C25.5,22.57 24.37,24.09 22.73,24.42C20.48,24.89 18.5,23.17 18.5,21V14.25C18.5,13.56 17.94,13 17.25,13C16.56,13 16,13.56 16,14.25V21C16,24.57 19.13,27.42 22.79,26.95ZM15,30C15,30.55 15.45,31 16,31H28C28.55,31 29,30.55 29,30C29,29.45 28.55,29 28,29H16C15.45,29 15,29.45 15,30Z"
+        android:fillColor="#8D97A5"/>
+  </group>
+</vector>

vector/src/main/res/layout/composer_rich_text_layout.xml

@@ -0,0 +1,156 @@
+<?xml version="1.0" encoding="utf-8"?>
+<merge xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    tools:constraintSet="@layout/composer_rich_text_layout_constraint_set_compact"
+    tools:parentTag="androidx.constraintlayout.widget.ConstraintLayout">
+
+    <!-- ========================
+        /!\ Constraints for this layout are defined in external layout files that are used as constraint set for animation.
+        /!\ These 3 files must be modified to stay coherent!
+    ======================== -->
+    <View
+        android:id="@+id/related_message_background"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:background="?colorSurface"
+        tools:ignore="MissingConstraints" />
+
+    <View
+        android:id="@+id/related_message_background_top_separator"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:background="?vctr_list_separator"
+        tools:ignore="MissingConstraints" />
+
+    <ImageView
+        android:id="@+id/composerRelatedMessageAvatar"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:importantForAccessibility="no"
+        tools:ignore="MissingConstraints" />
+
+    <TextView
+        android:id="@+id/composerRelatedMessageTitle"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:textStyle="bold"
+        tools:ignore="MissingConstraints"
+        tools:text="@tools:sample/first_names"
+        tools:visibility="gone" />
+
+    <TextView
+        android:id="@+id/composerRelatedMessageContent"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:ellipsize="end"
+        android:maxLines="3"
+        android:textColor="?vctr_message_text_color"
+        tools:ignore="MissingConstraints"
+        tools:text="@tools:sample/lorem"
+        tools:visibility="gone" />
+
+    <ImageView
+        android:id="@+id/composerRelatedMessageActionIcon"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:importantForAccessibility="no"
+        app:tint="?vctr_content_primary"
+        tools:ignore="MissingConstraints,MissingPrefix" />
+
+    <ImageView
+        android:id="@+id/composerRelatedMessageImage"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:importantForAccessibility="no"
+        tools:ignore="MissingPrefix" />
+
+    <ImageButton
+        android:id="@+id/composerRelatedMessageCloseButton"
+        android:layout_width="22dp"
+        android:layout_height="22dp"
+        android:background="?android:attr/selectableItemBackground"
+        android:contentDescription="@string/action_cancel"
+        android:src="@drawable/ic_close_round"
+        app:tint="?colorError"
+        tools:ignore="MissingConstraints,MissingPrefix" />
+
+    <androidx.constraintlayout.widget.Barrier
+        android:id="@+id/composer_preview_barrier"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        app:barrierDirection="bottom"
+        app:barrierMargin="8dp"
+        app:constraint_referenced_ids="composerRelatedMessageContent,composerRelatedMessageActionIcon"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent" />
+
+    <ImageButton
+        android:id="@+id/attachmentButton"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:background="?android:attr/selectableItemBackground"
+        android:contentDescription="@string/option_send_files"
+        android:src="@drawable/ic_attachment"
+        tools:ignore="MissingConstraints" />
+
+    <FrameLayout
+        android:id="@+id/composerEditTextOuterBorder"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:background="@drawable/bg_composer_edit_text" />
+
+    <io.element.android.wysiwyg.EditorEditText
+        android:id="@+id/composerEditText"
+        style="@style/Widget.Vector.EditText.Composer"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:nextFocusLeft="@id/composerEditText"
+        android:nextFocusUp="@id/composerEditText"
+        tools:hint="@string/room_message_placeholder"
+        tools:ignore="MissingConstraints" />
+
+    <ImageButton
+        android:id="@+id/sendButton"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:background="@drawable/bg_send"
+        android:contentDescription="@string/action_send"
+        android:src="@drawable/ic_send"
+        tools:ignore="MissingConstraints" />
+
+    <HorizontalScrollView android:id="@+id/richTextMenuScrollView"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:scrollbars="none"
+        app:layout_constraintTop_toTopOf="@id/sendButton"
+        app:layout_constraintStart_toEndOf="@id/attachmentButton"
+        app:layout_constraintEnd_toStartOf="@id/sendButton"
+        app:layout_constraintBottom_toBottomOf="parent"
+        android:fillViewport="true">
+
+        <LinearLayout
+            android:id="@+id/richTextMenu"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:orientation="horizontal">
+
+        </LinearLayout>
+
+    </HorizontalScrollView>
+
+    <!--
+    <ImageButton
+        android:id="@+id/voiceMessageMicButton"
+        android:layout_width="32dp"
+        android:layout_height="32dp"
+        android:layout_marginEnd="12dp"
+        android:layout_marginBottom="12dp"
+        android:background="?android:attr/selectableItemBackground"
+        android:contentDescription="@string/a11y_start_voice_message"
+        android:src="@drawable/ic_voice_mic" />
+    -->
+
+</merge>

vector/src/main/res/layout/composer_rich_text_layout_constraint_set_compact.xml

@@ -0,0 +1,200 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/composerLayout"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    app:layout_constraintBottom_toBottomOf="parent"
+    app:layout_constraintEnd_toEndOf="parent"
+    app:layout_constraintStart_toStartOf="parent">
+
+    <View
+        android:id="@+id/related_message_background"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:background="?colorSurface"
+        app:layout_constraintBottom_toTopOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        tools:layout_height="40dp" />
+
+    <View
+        android:id="@+id/related_message_background_top_separator"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:background="?vctr_list_separator"
+        app:layout_constraintBottom_toTopOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent" />
+
+    <ImageView
+        android:id="@+id/composerRelatedMessageAvatar"
+        android:layout_width="40dp"
+        android:layout_height="40dp"
+        android:importantForAccessibility="no"
+        android:visibility="invisible"
+        app:layout_constraintBottom_toTopOf="parent"
+        app:layout_constraintEnd_toStartOf="parent" />
+
+    <TextView
+        android:id="@+id/composerRelatedMessageTitle"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:textStyle="bold"
+        android:visibility="invisible"
+        app:layout_constraintBottom_toTopOf="@id/composerRelatedMessageContent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        tools:text="@tools:sample/first_names" />
+
+    <TextView
+        android:id="@+id/composerRelatedMessageContent"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:visibility="invisible"
+        app:layout_constraintBottom_toTopOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        tools:text="@tools:sample/lorem/random" />
+
+    <ImageView
+        android:id="@+id/composerRelatedMessageActionIcon"
+        android:layout_width="20dp"
+        android:layout_height="20dp"
+        android:layout_marginTop="8dp"
+        android:layout_marginBottom="38dp"
+        android:alpha="0"
+        android:importantForAccessibility="no"
+        app:layout_constraintEnd_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="parent"
+        app:tint="?vctr_content_primary"
+        tools:ignore="MissingConstraints,MissingPrefix"
+        tools:src="@drawable/ic_edit" />
+
+    <ImageView
+        android:id="@+id/composerRelatedMessageImage"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:importantForAccessibility="no"
+        app:layout_constraintBottom_toTopOf="parent"
+        app:layout_constraintStart_toEndOf="parent"
+        tools:ignore="MissingPrefix"
+        tools:src="@tools:sample/backgrounds/scenic" />
+
+    <ImageButton
+        android:id="@+id/composerRelatedMessageCloseButton"
+        android:layout_width="22dp"
+        android:layout_height="22dp"
+        android:background="?android:attr/selectableItemBackground"
+        android:contentDescription="@string/action_cancel"
+        android:src="@drawable/ic_close_round"
+        android:visibility="invisible"
+        app:layout_constraintBottom_toTopOf="parent"
+        app:layout_constraintStart_toEndOf="parent"
+        app:tint="?colorError"
+        tools:ignore="MissingPrefix"
+        tools:visibility="visible" />
+
+    <androidx.constraintlayout.widget.Barrier
+        android:id="@+id/composer_preview_barrier"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        app:barrierDirection="bottom"
+        app:barrierMargin="8dp"
+        app:constraint_referenced_ids="composerRelatedMessageContent,composerRelatedMessageActionIcon"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent" />
+
+    <ImageButton
+        android:id="@+id/attachmentButton"
+        android:layout_width="@dimen/composer_attachment_size"
+        android:layout_height="@dimen/composer_attachment_size"
+        android:layout_margin="@dimen/composer_attachment_margin"
+        android:background="?android:attr/selectableItemBackground"
+        android:contentDescription="@string/option_send_files"
+        android:src="@drawable/ic_attachment"
+        app:layout_constraintBottom_toBottomOf="@id/sendButton"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="@id/sendButton"
+        app:layout_goneMarginBottom="57dp"
+        tools:ignore="MissingPrefix" />
+
+    <FrameLayout
+        android:id="@+id/composerEditTextOuterBorder"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:layout_marginTop="8dp"
+        android:layout_marginBottom="8dp"
+        app:layout_constraintBottom_toBottomOf="@id/composerEditText"
+        app:layout_constraintStart_toStartOf="@id/composerEditText"
+        app:layout_constraintEnd_toEndOf="@id/composerEditText"
+        app:layout_constraintTop_toTopOf="@id/composerEditText"
+        app:layout_goneMarginEnd="12dp" />
+
+    <io.element.android.wysiwyg.EditorEditText
+        android:id="@+id/composerEditText"
+        style="@style/Widget.Vector.EditText.Composer"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:hint="@string/room_message_placeholder"
+        android:nextFocusLeft="@id/composerEditText"
+        android:nextFocusUp="@id/composerEditText"
+        android:layout_marginHorizontal="10dp"
+        app:layout_constraintVertical_bias="0"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        tools:text="@tools:sample/lorem/random" />
+
+    <ImageButton
+        android:id="@+id/sendButton"
+        android:layout_width="56dp"
+        android:layout_height="@dimen/composer_min_height"
+        android:layout_marginEnd="2dp"
+        android:background="@drawable/bg_send"
+        android:contentDescription="@string/action_send"
+        android:scaleType="center"
+        android:src="@drawable/ic_send"
+        android:visibility="invisible"
+        app:layout_constraintTop_toBottomOf="@id/composerEditText"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        tools:ignore="MissingPrefix"
+        tools:visibility="visible" />
+
+    <HorizontalScrollView android:id="@+id/richTextMenuScrollView"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        app:layout_constraintTop_toTopOf="@id/sendButton"
+        app:layout_constraintStart_toEndOf="@id/attachmentButton"
+        app:layout_constraintEnd_toStartOf="@id/sendButton"
+        app:layout_constraintBottom_toBottomOf="parent"
+        android:fillViewport="true">
+
+        <LinearLayout
+            android:id="@+id/richTextMenu"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:orientation="horizontal">
+
+        </LinearLayout>
+
+    </HorizontalScrollView>
+
+    <!--
+    <ImageButton
+        android:id="@+id/voiceMessageMicButton"
+        android:layout_width="32dp"
+        android:layout_height="32dp"
+        android:layout_marginEnd="12dp"
+        android:layout_marginBottom="12dp"
+        android:background="?android:attr/selectableItemBackground"
+        android:contentDescription="@string/a11y_start_voice_message"
+        android:src="@drawable/ic_voice_mic"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent" />
+    -->
+
+</androidx.constraintlayout.widget.ConstraintLayout>

vector/src/main/res/layout/composer_rich_text_layout_constraint_set_expanded.xml

@@ -0,0 +1,198 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/composerLayout"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    app:layout_constraintBottom_toBottomOf="parent"
+    app:layout_constraintEnd_toEndOf="parent"
+    app:layout_constraintStart_toStartOf="parent">
+
+    <View
+        android:id="@+id/related_message_background"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:background="?colorSurface"
+        app:layout_constraintBottom_toBottomOf="@id/composer_preview_barrier"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <View
+        android:id="@+id/related_message_background_top_separator"
+        android:layout_width="0dp"
+        android:layout_height="1dp"
+        android:background="?vctr_list_separator"
+        app:layout_constraintEnd_toEndOf="@id/related_message_background"
+        app:layout_constraintStart_toStartOf="@id/related_message_background"
+        app:layout_constraintTop_toTopOf="@id/related_message_background" />
+
+    <ImageView
+        android:id="@+id/composerRelatedMessageAvatar"
+        android:layout_width="40dp"
+        android:layout_height="40dp"
+        android:layout_marginStart="8dp"
+        android:layout_marginTop="8dp"
+        android:layout_marginBottom="8dp"
+        android:importantForAccessibility="no"
+        app:layout_constraintBottom_toTopOf="@id/composerRelatedMessageActionIcon"
+        app:layout_constraintEnd_toStartOf="@id/composerRelatedMessageTitle"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="@id/composerRelatedMessageTitle"
+        tools:src="@sample/user_round_avatars" />
+
+    <TextView
+        android:id="@+id/composerRelatedMessageTitle"
+        style="@style/Widget.Vector.TextView.Body"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_margin="8dp"
+        android:textStyle="bold"
+        app:layout_constraintEnd_toStartOf="@id/composerRelatedMessageCloseButton"
+        app:layout_constraintStart_toEndOf="@id/composerRelatedMessageAvatar"
+        app:layout_constraintTop_toTopOf="parent"
+        tools:text="@tools:sample/first_names" />
+
+    <ImageView
+        android:id="@+id/composerRelatedMessageImage"
+        android:layout_width="100dp"
+        android:layout_height="66dp"
+        android:layout_marginTop="6dp"
+        android:importantForAccessibility="no"
+        android:scaleType="centerCrop"
+        android:visibility="gone"
+        app:layout_constraintStart_toStartOf="@id/composerRelatedMessageTitle"
+        app:layout_constraintTop_toBottomOf="@id/composerRelatedMessageTitle"
+        tools:ignore="MissingPrefix"
+        tools:src="@tools:sample/backgrounds/scenic"
+        tools:visibility="visible" />
+
+    <TextView
+        android:id="@+id/composerRelatedMessageContent"
+        style="@style/Widget.Vector.TextView.Body"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:ellipsize="end"
+        android:maxLines="2"
+        android:textColor="?vctr_message_text_color"
+        app:layout_constrainedHeight="true"
+        app:layout_constraintEnd_toEndOf="@id/composerRelatedMessageTitle"
+        app:layout_constraintStart_toStartOf="@id/composerRelatedMessageTitle"
+        app:layout_constraintTop_toBottomOf="@id/composerRelatedMessageImage"
+        tools:text="@tools:sample/lorem/random" />
+
+    <ImageView
+        android:id="@+id/composerRelatedMessageActionIcon"
+        android:layout_width="10dp"
+        android:layout_height="10dp"
+        android:layout_marginTop="6dp"
+        android:layout_marginBottom="38dp"
+        android:alpha="1"
+        android:importantForAccessibility="no"
+        android:visibility="visible"
+        app:layout_constraintEnd_toEndOf="@id/composerRelatedMessageAvatar"
+        app:layout_constraintStart_toStartOf="@id/composerRelatedMessageAvatar"
+        app:layout_constraintTop_toBottomOf="@id/composerRelatedMessageAvatar"
+        app:tint="?vctr_content_primary"
+        tools:ignore="MissingPrefix"
+        tools:src="@drawable/ic_edit" />
+
+    <ImageButton
+        android:id="@+id/composerRelatedMessageCloseButton"
+        android:layout_width="48dp"
+        android:layout_height="48dp"
+        android:background="?android:attr/selectableItemBackground"
+        android:contentDescription="@string/action_cancel"
+        android:src="@drawable/ic_close_round"
+        app:layout_constraintBottom_toBottomOf="@id/composer_preview_barrier"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:tint="?colorError"
+        tools:ignore="MissingPrefix" />
+
+    <androidx.constraintlayout.widget.Barrier
+        android:id="@+id/composer_preview_barrier"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        app:barrierDirection="bottom"
+        app:barrierMargin="8dp"
+        app:constraint_referenced_ids="composerRelatedMessageContent,composerRelatedMessageActionIcon"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent" />
+
+    <ImageButton
+        android:id="@+id/attachmentButton"
+        android:layout_width="@dimen/composer_attachment_size"
+        android:layout_height="@dimen/composer_attachment_size"
+        android:layout_margin="@dimen/composer_attachment_margin"
+        android:background="?android:attr/selectableItemBackground"
+        android:contentDescription="@string/option_send_files"
+        android:src="@drawable/ic_attachment"
+        app:layout_constraintBottom_toBottomOf="@id/sendButton"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="@id/sendButton"
+        tools:ignore="MissingPrefix" />
+
+    <FrameLayout
+        android:id="@+id/composerEditTextOuterBorder"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:layout_marginStart="8dp"
+        android:layout_marginEnd="8dp"
+        android:layout_marginTop="8dp"
+        android:layout_marginBottom="8dp"
+        app:layout_constraintBottom_toTopOf="@id/sendButton"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/composer_preview_barrier"
+        app:layout_goneMarginEnd="12dp" />
+
+    <io.element.android.wysiwyg.EditorEditText
+        android:id="@+id/composerEditText"
+        style="@style/Widget.Vector.EditText.Composer"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:nextFocusLeft="@id/composerEditText"
+        android:nextFocusUp="@id/composerEditText"
+        app:layout_constraintBottom_toTopOf="@id/sendButton"
+        app:layout_constraintEnd_toEndOf="@id/composerEditTextOuterBorder"
+        app:layout_constraintStart_toStartOf="@id/composerEditTextOuterBorder"
+        app:layout_constraintTop_toBottomOf="@id/composer_preview_barrier"
+        tools:text="@tools:sample/lorem/random" />
+
+    <ImageButton
+        android:id="@+id/sendButton"
+        android:layout_width="56dp"
+        android:layout_height="@dimen/composer_min_height"
+        android:layout_marginEnd="2dp"
+        android:background="@drawable/bg_send"
+        android:contentDescription="@string/action_send"
+        android:scaleType="center"
+        android:src="@drawable/ic_send"
+        android:visibility="invisible"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/composerEditText"
+        app:layout_constraintVertical_bias="1"
+        tools:ignore="MissingPrefix"
+        tools:visibility="visible" />
+
+    <HorizontalScrollView android:id="@+id/richTextMenuScrollView"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        app:layout_constraintTop_toTopOf="@id/sendButton"
+        app:layout_constraintStart_toEndOf="@id/attachmentButton"
+        app:layout_constraintEnd_toStartOf="@id/sendButton"
+        app:layout_constraintBottom_toBottomOf="parent"
+        android:fillViewport="true">
+
+        <LinearLayout
+            android:id="@+id/richTextMenu"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:orientation="horizontal">
+
+        </LinearLayout>
+
+    </HorizontalScrollView>
+
+</androidx.constraintlayout.widget.ConstraintLayout>

vector/src/main/res/layout/fragment_composer.xml

@@ -1,8 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
-<im.vector.app.features.home.room.detail.composer.MessageComposerView
+<FrameLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content">
+
+    <im.vector.app.features.home.room.detail.composer.PlainTextComposerLayout
         android:id="@+id/composerLayout"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
@@ -10,4 +14,16 @@
         android:minHeight="56dp"
         android:transitionName="composer"
         android:visibility="gone"
+        tools:visibility="gone" />
+
+    <im.vector.app.features.home.room.detail.composer.RichTextComposerLayout
+        android:id="@+id/richTextComposerLayout"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:background="?android:colorBackground"
+        android:minHeight="56dp"
+        android:transitionName="composer"
+        android:visibility="gone"
         tools:visibility="visible" />
+
+</FrameLayout>

vector/src/main/res/layout/view_rich_text_menu_button.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ImageButton xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="48dp"
+    android:layout_height="48dp"
+    android:layout_marginHorizontal="2dp"
+    android:background="@android:color/transparent"
+    android:contentDescription="@string/app_name">
+    <!-- The contentDescription attr is populated programmatically. This is just to fix lint issues. -->
+
+</ImageButton>

vector/src/main/res/xml/vector_settings_labs.xml

@@ -96,4 +96,11 @@
         android:title="@string/labs_enable_deferred_dm_title"
         app:isPreferenceVisible="@bool/settings_labs_deferred_dm_visible" />
 
+    <im.vector.app.core.preference.VectorSwitchPreference
+        android:defaultValue="@bool/settings_labs_rich_text_editor_default"
+        android:key="SETTINGS_LABS_RICH_TEXT_EDITOR_KEY"
+        android:summary="@string/labs_enable_rich_text_editor_summary"
+        android:title="@string/labs_enable_rich_text_editor_title"
+        app:isPreferenceVisible="@bool/settings_labs_rich_text_editor_visible" />
+
 </androidx.preference.PreferenceScreen>

vector/src/test/java/im/vector/app/features/command/CommandParserTest.kt

@@ -71,7 +71,7 @@ class CommandParserTest {
 
     private fun test(message: String, expectedResult: ParsedCommand) {
         val commandParser = CommandParser()
-        val result = commandParser.parseSlashCommand(message, false)
+        val result = commandParser.parseSlashCommand(message, null, false)
         result shouldBeEqualTo expectedResult
     }
 }