feat: join and create rooms

app/src/main/java/ru/risdeveau/pixeldragon/ui/activity/MainActivity.kt

@@ -23,6 +23,7 @@ import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.CenterAlignedTopAppBar
 import androidx.compose.material3.CircularProgressIndicator
 import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.FloatingActionButton
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
@@ -73,9 +74,13 @@ import ru.risdeveau.pixeldragon.push.MatrixUnifiedPushManager
 import ru.risdeveau.pixeldragon.ui.item.Avatar
 import ru.risdeveau.pixeldragon.ui.layout.AccountSettingsScreen
 import ru.risdeveau.pixeldragon.ui.layout.AppearanceSettingsScreen
+import ru.risdeveau.pixeldragon.ui.layout.CreateRoomScreen
 import ru.risdeveau.pixeldragon.ui.layout.DevicesSettingsScreen
+import ru.risdeveau.pixeldragon.ui.layout.JoinRoomScreen
 import ru.risdeveau.pixeldragon.ui.layout.NotificationsSettingsScreen
 import ru.risdeveau.pixeldragon.ui.layout.Room
+import ru.risdeveau.pixeldragon.ui.layout.RoomActionsRoutes
+import ru.risdeveau.pixeldragon.ui.layout.RoomActionsSheet
 import ru.risdeveau.pixeldragon.ui.layout.RoomList
 import ru.risdeveau.pixeldragon.ui.layout.SettingsMainScreen
 import ru.risdeveau.pixeldragon.ui.layout.SettingsRoutes
@@ -108,6 +113,18 @@ class MainActivity : ComponentActivity() {
                     val navController = rememberNavController()
                     val syncState by client!!.api.sync.currentSyncState
                         .collectAsState(initial = SyncState.STOPPED)
+                    val backStackEntry by navController.currentBackStackEntryAsState()
+                    val route = backStackEntry?.destination?.route
+                    var showRoomActionsSheet by remember { mutableStateOf(false) }
+
+                    if (showRoomActionsSheet) {
+                        RoomActionsSheet(
+                            onDismiss = { showRoomActionsSheet = false },
+                            onJoinRoom = { navController.navigate(RoomActionsRoutes.JoinRoom) },
+                            onCreateRoom = { navController.navigate(RoomActionsRoutes.CreateRoom) },
+                            onCreateSpace = { navController.navigate(RoomActionsRoutes.CreateSpace) },
+                        )
+                    }
 
                     Scaffold(
                         modifier = Modifier.fillMaxSize(),
@@ -117,9 +134,16 @@ class MainActivity : ComponentActivity() {
                                 syncState = syncState,
                             )
                         },
+                        floatingActionButton = {
+                            if (route == RoomActionsRoutes.Rooms) {
+                                FloatingActionButton(onClick = { showRoomActionsSheet = true }) {
+                                    Text("+")
+                                }
+                            }
+                        },
                     ) { innerPadding ->
-                        NavHost(navController = navController, startDestination = "rooms") {
+                        NavHost(navController = navController, startDestination = RoomActionsRoutes.Rooms) {
-                            composable("rooms") {
+                            composable(RoomActionsRoutes.Rooms) {
                                 RoomList(Modifier.padding(innerPadding), navController)
                             }
                             composable(
@@ -140,6 +164,41 @@ class MainActivity : ComponentActivity() {
                                 )
                             }
 
+                            composable(RoomActionsRoutes.JoinRoom) {
+                                JoinRoomScreen(
+                                    modifier = Modifier.padding(innerPadding),
+                                    onJoined = { roomId ->
+                                        navController.navigate("room/${roomId.full}") {
+                                            popUpTo(RoomActionsRoutes.Rooms)
+                                        }
+                                    },
+                                )
+                            }
+
+                            composable(RoomActionsRoutes.CreateRoom) {
+                                CreateRoomScreen(
+                                    modifier = Modifier.padding(innerPadding),
+                                    isSpace = false,
+                                    onCreated = { roomId ->
+                                        navController.navigate("room/${roomId.full}") {
+                                            popUpTo(RoomActionsRoutes.Rooms)
+                                        }
+                                    },
+                                )
+                            }
+
+                            composable(RoomActionsRoutes.CreateSpace) {
+                                CreateRoomScreen(
+                                    modifier = Modifier.padding(innerPadding),
+                                    isSpace = true,
+                                    onCreated = { roomId ->
+                                        navController.navigate("space/${roomId.full}") {
+                                            popUpTo(RoomActionsRoutes.Rooms)
+                                        }
+                                    },
+                                )
+                            }
+
                             navigation(
                                 route = SettingsRoutes.Graph,
                                 startDestination = SettingsRoutes.Main,
@@ -216,6 +275,7 @@ private fun PixelDragonTopBar(
     val route = backStackEntry?.destination?.route
     val rid = backStackEntry?.arguments?.getString("rid")
     val isRoomLikeScreen = route == "room/{rid}" || route == "space/{rid}"
+    val roomActionTitle = RoomActionsRoutes.titleFor(route)
     val isSettingsScreen = route == SettingsRoutes.Graph || route?.startsWith("settings/") == true
 
     val roomsFlow = remember(client) {
@@ -240,6 +300,14 @@ private fun PixelDragonTopBar(
             )
         }
 
+        roomActionTitle != null -> {
+            RoomTopBar(
+                room = null,
+                fallbackTitle = roomActionTitle,
+                onBack = { navController.popBackStack() },
+            )
+        }
+
         isSettingsScreen -> {
             RoomTopBar(
                 room = null,

app/src/main/java/ru/risdeveau/pixeldragon/ui/layout/CreateRoom.kt

@@ -0,0 +1,195 @@
+/*
+ * Created by sweetbread
+ * Copyright (c) 2026. All rights reserved.
+ */
+
+package ru.risdeveau.pixeldragon.ui.layout
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material3.Button
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.Switch
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+import de.connect2x.trixnity.clientserverapi.model.room.CreateRoom
+import de.connect2x.trixnity.clientserverapi.model.room.DirectoryVisibility
+import de.connect2x.trixnity.core.model.RoomAliasId
+import de.connect2x.trixnity.core.model.RoomId
+import de.connect2x.trixnity.core.model.events.m.room.CreateEventContent
+import kotlinx.coroutines.launch
+import ru.risdeveau.pixeldragon.client
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun CreateRoomScreen(
+    modifier: Modifier = Modifier,
+    isSpace: Boolean,
+    onCreated: (RoomId) -> Unit,
+) {
+    val matrixClient = client!!
+    val scope = rememberCoroutineScope()
+
+    var name by remember { mutableStateOf("") }
+    var topic by remember { mutableStateOf("") }
+    var alias by remember { mutableStateOf("") }
+    var isPublic by remember { mutableStateOf(false) }
+    var isCreating by remember { mutableStateOf(false) }
+    var error by remember { mutableStateOf<String?>(null) }
+
+    Column(
+        modifier = modifier
+            .fillMaxSize()
+            .padding(16.dp),
+        verticalArrangement = Arrangement.spacedBy(14.dp),
+    ) {
+        Text(
+            text = if (isSpace) "New space" else "New room",
+            style = MaterialTheme.typography.headlineSmall,
+        )
+
+        Text(
+            text = if (isSpace) {
+                "Spaces are useful for grouping related rooms."
+            } else {
+                "Create a room, then invite people or publish it in the directory."
+            },
+            color = MaterialTheme.colorScheme.onSurfaceVariant,
+        )
+
+        OutlinedTextField(
+            modifier = Modifier.fillMaxWidth(),
+            value = name,
+            onValueChange = { name = it },
+            singleLine = true,
+            label = { Text(if (isSpace) "Space name" else "Room name") },
+        )
+
+        OutlinedTextField(
+            modifier = Modifier.fillMaxWidth(),
+            value = topic,
+            onValueChange = { topic = it },
+            minLines = 2,
+            label = { Text("Topic") },
+        )
+
+        OutlinedTextField(
+            modifier = Modifier.fillMaxWidth(),
+            value = alias,
+            onValueChange = { alias = it.trim() },
+            singleLine = true,
+            label = { Text("Local alias, optional") },
+            supportingText = {
+                Text("Example: pixeldragon creates #pixeldragon:${matrixClient.userId.domain}")
+            },
+        )
+
+        Row(
+            modifier = Modifier.fillMaxWidth(),
+            verticalAlignment = Alignment.CenterVertically,
+            horizontalArrangement = Arrangement.SpaceBetween,
+        ) {
+            Column(modifier = Modifier.weight(1f)) {
+                Text("Publish in room directory")
+                Text(
+                    text = "People can find it in public search. Join rules are still controlled by the server.",
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    style = MaterialTheme.typography.bodySmall,
+                )
+            }
+
+            Switch(
+                checked = isPublic,
+                onCheckedChange = { isPublic = it },
+            )
+        }
+
+        error?.let {
+            Text(
+                text = it,
+                color = MaterialTheme.colorScheme.error,
+            )
+        }
+
+        Spacer(Modifier.height(4.dp))
+
+        Button(
+            modifier = Modifier.fillMaxWidth(),
+            enabled = !isCreating && name.isNotBlank(),
+            onClick = {
+                isCreating = true
+                error = null
+
+                scope.launch {
+                    val aliasValue = alias.trim()
+                    val roomAliasId = aliasValue.toRoomAliasIdOrNull(matrixClient.userId.domain)
+
+                    if (aliasValue.isNotEmpty() && roomAliasId == null) {
+                        error = "Invalid alias"
+                        isCreating = false
+                        return@launch
+                    }
+
+                    val result = matrixClient.api.room.createRoom(
+                        visibility = if (isPublic) DirectoryVisibility.PUBLIC else DirectoryVisibility.PRIVATE,
+                        roomAliasId = roomAliasId,
+                        name = name.trim(),
+                        topic = topic.trim().takeIf { it.isNotEmpty() },
+                        preset = if (isPublic) CreateRoom.Request.Preset.PUBLIC else CreateRoom.Request.Preset.PRIVATE,
+                        creationContent = if (isSpace) {
+                            CreateEventContent(type = CreateEventContent.RoomType.Space)
+                        } else {
+                            null
+                        },
+                    )
+
+                    result.fold(
+                        onSuccess = { roomId -> onCreated(roomId) },
+                        onFailure = { throwable ->
+                            error = throwable.message ?: "Could not create ${if (isSpace) "space" else "room"}"
+                        },
+                    )
+
+                    isCreating = false
+                }
+            },
+        ) {
+            if (isCreating) {
+                CircularProgressIndicator()
+            } else {
+                Text(if (isSpace) "Create space" else "Create room")
+            }
+        }
+    }
+}
+
+private fun String.toRoomAliasIdOrNull(defaultDomain: String): RoomAliasId? {
+    val value = trim()
+    if (value.isEmpty()) return null
+
+    val fullAlias = when {
+        value.startsWith("#") && value.contains(":") -> value
+        value.startsWith("#") -> "$value:$defaultDomain"
+        value.contains(":") -> "#$value"
+        else -> "#$value:$defaultDomain"
+    }
+
+    return RoomAliasId(fullAlias).takeIf { it.isValid }
+}

app/src/main/java/ru/risdeveau/pixeldragon/ui/layout/JoinRoom.kt

@@ -0,0 +1,450 @@
+/*
+ * Created by sweetbread
+ * Copyright (c) 2026. All rights reserved.
+ */
+
+package ru.risdeveau.pixeldragon.ui.layout
+
+import android.net.Uri
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.AssistChip
+import androidx.compose.material3.Button
+import androidx.compose.material3.CardDefaults
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.ElevatedCard
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedButton
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.dp
+import de.connect2x.trixnity.clientserverapi.model.room.GetPublicRoomsResponse
+import de.connect2x.trixnity.clientserverapi.model.room.GetPublicRoomsWithFilter
+import de.connect2x.trixnity.core.model.RoomAliasId
+import de.connect2x.trixnity.core.model.RoomId
+import de.connect2x.trixnity.core.model.events.m.room.CreateEventContent
+import de.connect2x.trixnity.core.model.events.m.room.JoinRulesEventContent
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
+import ru.risdeveau.pixeldragon.client
+import ru.risdeveau.pixeldragon.ui.item.Avatar
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun JoinRoomScreen(
+    modifier: Modifier = Modifier,
+    onJoined: (RoomId) -> Unit,
+) {
+    val matrixClient = client!!
+    val scope = rememberCoroutineScope()
+
+    var query by remember { mutableStateOf("") }
+    var server by remember { mutableStateOf(matrixClient.userId.domain) }
+    var results by remember { mutableStateOf<List<GetPublicRoomsResponse.PublicRoomsChunk>>(emptyList()) }
+    var nextBatch by remember { mutableStateOf<String?>(null) }
+    var isSearching by remember { mutableStateOf(false) }
+    var isJoining by remember { mutableStateOf(false) }
+    var error by remember { mutableStateOf<String?>(null) }
+
+    val directTarget = remember(query) { query.parseJoinTarget() }
+
+    fun searchPublicRooms(since: String? = null) {
+        isSearching = true
+        error = null
+
+        scope.launch {
+            val searchTerm = query.trim().takeUnless { directTarget != null }
+            val result = matrixClient.api.room.getPublicRooms(
+                limit = 30,
+                server = server.trim().ifEmpty { null },
+                since = since,
+                filter = GetPublicRoomsWithFilter.Request.Filter(
+                    genericSearchTerm = searchTerm?.takeIf { it.isNotBlank() },
+                ),
+            )
+
+            result.fold(
+                onSuccess = { response ->
+                    results = if (since == null) response.chunk else results + response.chunk
+                    nextBatch = response.nextBatch
+                },
+                onFailure = { throwable ->
+                    if (since == null) results = emptyList()
+                    nextBatch = null
+                    error = throwable.message ?: "Could not search rooms"
+                },
+            )
+
+            isSearching = false
+        }
+    }
+
+    fun joinTarget(target: JoinTarget) {
+        isJoining = true
+        error = null
+
+        scope.launch {
+            val result = when (target) {
+                is JoinTarget.Alias -> matrixClient.api.room.joinRoom(
+                    roomAliasId = RoomAliasId(target.alias),
+                    via = target.via.takeIf { it.isNotEmpty() },
+                )
+                is JoinTarget.Room -> matrixClient.api.room.joinRoom(
+                    roomId = RoomId(target.roomId),
+                    via = target.via.takeIf { it.isNotEmpty() },
+                )
+            }
+
+            result.fold(
+                onSuccess = { roomId -> onJoined(roomId) },
+                onFailure = { throwable ->
+                    error = throwable.message ?: "Could not join room"
+                },
+            )
+
+            isJoining = false
+        }
+    }
+
+    LaunchedEffect(query, server) {
+        delay(450)
+        if (query.parseJoinTarget() == null) {
+            searchPublicRooms()
+        } else {
+            results = emptyList()
+            nextBatch = null
+        }
+    }
+
+    LazyColumn(
+        modifier = modifier.fillMaxSize(),
+        contentPadding = PaddingValues(16.dp),
+        verticalArrangement = Arrangement.spacedBy(12.dp),
+    ) {
+        item {
+            Column(verticalArrangement = Arrangement.spacedBy(12.dp)) {
+                Text(
+                    text = "Join room or space",
+                    style = MaterialTheme.typography.headlineSmall,
+                )
+
+                Text(
+                    text = "Search a public room directory, paste #alias:server, !roomId:server or a matrix.to link.",
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                )
+
+                OutlinedTextField(
+                    modifier = Modifier.fillMaxWidth(),
+                    value = query,
+                    onValueChange = { query = it },
+                    singleLine = true,
+                    label = { Text("Search, alias or Matrix link") },
+                )
+
+                OutlinedTextField(
+                    modifier = Modifier.fillMaxWidth(),
+                    value = server,
+                    onValueChange = { server = it.trim() },
+                    singleLine = true,
+                    label = { Text("Directory server") },
+                    supportingText = { Text("Leave current homeserver or enter another server, for example matrix.org") },
+                )
+            }
+        }
+
+        directTarget?.let { target ->
+            item {
+                ElevatedCard(
+                    modifier = Modifier.fillMaxWidth(),
+                    colors = CardDefaults.elevatedCardColors(
+                        containerColor = MaterialTheme.colorScheme.primaryContainer,
+                    ),
+                ) {
+                    Column(
+                        modifier = Modifier.padding(16.dp),
+                        verticalArrangement = Arrangement.spacedBy(10.dp),
+                    ) {
+                        Text(
+                            text = "Direct join",
+                            style = MaterialTheme.typography.titleMedium,
+                        )
+                        Text(
+                            text = target.id,
+                            maxLines = 2,
+                            overflow = TextOverflow.Ellipsis,
+                        )
+                        if (target.via.isNotEmpty()) {
+                            Text(
+                                text = "via ${target.via.joinToString()}",
+                                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                            )
+                        }
+                        Button(
+                            enabled = !isJoining,
+                            onClick = { joinTarget(target) },
+                        ) {
+                            if (isJoining) {
+                                CircularProgressIndicator()
+                            } else {
+                                Text("Join")
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+        error?.let {
+            item {
+                Text(
+                    text = it,
+                    color = MaterialTheme.colorScheme.error,
+                )
+            }
+        }
+
+        if (directTarget == null) {
+            item {
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    verticalAlignment = Alignment.CenterVertically,
+                    horizontalArrangement = Arrangement.SpaceBetween,
+                ) {
+                    Text(
+                        text = if (query.isBlank()) "Public directory" else "Search results",
+                        style = MaterialTheme.typography.titleMedium,
+                    )
+
+                    if (isSearching) {
+                        CircularProgressIndicator(modifier = Modifier.size(24.dp))
+                    }
+                }
+            }
+
+            if (!isSearching && results.isEmpty()) {
+                item {
+                    Text(
+                        text = "No rooms found",
+                        color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    )
+                }
+            }
+
+            items(
+                items = results,
+                key = { it.roomId.full },
+            ) { room ->
+                PublicRoomItem(
+                    room = room,
+                    isJoining = isJoining,
+                    onJoin = {
+                        joinTarget(
+                            JoinTarget.Room(
+                                roomId = room.roomId.full,
+                                via = room.canonicalAlias?.domain?.let { setOf(it) }.orEmpty(),
+                            ),
+                        )
+                    },
+                    onKnock = {
+                        isJoining = true
+                        error = null
+                        scope.launch {
+                            val result = matrixClient.api.room.knockRoom(room.roomId)
+                            result.fold(
+                                onSuccess = { roomId -> onJoined(roomId) },
+                                onFailure = { throwable -> error = throwable.message ?: "Could not knock room" },
+                            )
+                            isJoining = false
+                        }
+                    },
+                )
+            }
+
+            nextBatch?.let { since ->
+                item {
+                    OutlinedButton(
+                        modifier = Modifier.fillMaxWidth(),
+                        enabled = !isSearching,
+                        onClick = { searchPublicRooms(since) },
+                    ) {
+                        Text("Load more")
+                    }
+                }
+            }
+        }
+    }
+}
+
+@Composable
+private fun PublicRoomItem(
+    room: GetPublicRoomsResponse.PublicRoomsChunk,
+    isJoining: Boolean,
+    onJoin: () -> Unit,
+    onKnock: () -> Unit,
+) {
+    val isSpace = room.roomType == CreateEventContent.RoomType.Space
+    val title = room.name ?: room.canonicalAlias?.full ?: room.roomId.full
+    val avatarShape = if (isSpace) RoundedCornerShape(12.dp) else CircleShape
+    val canKnock = room.joinRule == JoinRulesEventContent.JoinRule.Knock ||
+            room.joinRule == JoinRulesEventContent.JoinRule.KnockRestricted
+
+    ElevatedCard(modifier = Modifier.fillMaxWidth()) {
+        Column(
+            modifier = Modifier.padding(16.dp),
+            verticalArrangement = Arrangement.spacedBy(12.dp),
+        ) {
+            Row(
+                horizontalArrangement = Arrangement.spacedBy(12.dp),
+                verticalAlignment = Alignment.CenterVertically,
+            ) {
+                Avatar(
+                    modifier = Modifier
+                        .size(48.dp)
+                        .clip(avatarShape),
+                    url = room.avatarUrl,
+                    fallbackName = title,
+                )
+
+                Column(modifier = Modifier.weight(1f)) {
+                    Text(
+                        text = title,
+                        maxLines = 1,
+                        overflow = TextOverflow.Ellipsis,
+                        style = MaterialTheme.typography.titleMedium,
+                    )
+                    room.canonicalAlias?.let {
+                        Text(
+                            text = it.full,
+                            maxLines = 1,
+                            overflow = TextOverflow.Ellipsis,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant,
+                        )
+                    }
+                }
+            }
+
+            room.topic?.takeIf { it.isNotBlank() }?.let {
+                Text(
+                    text = it,
+                    maxLines = 3,
+                    overflow = TextOverflow.Ellipsis,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                )
+            }
+
+            Row(
+                horizontalArrangement = Arrangement.spacedBy(8.dp),
+            ) {
+                AssistChip(
+                    onClick = {},
+                    label = { Text(if (isSpace) "space" else "room") },
+                )
+                AssistChip(
+                    onClick = {},
+                    label = { Text(room.joinRule.name) },
+                )
+                AssistChip(
+                    onClick = {},
+                    label = { Text("${room.joinedMembersCount} members") },
+                )
+            }
+
+            Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+                Button(
+                    enabled = !isJoining,
+                    onClick = onJoin,
+                ) {
+                    Text("Join")
+                }
+
+                if (canKnock) {
+                    OutlinedButton(
+                        enabled = !isJoining,
+                        onClick = onKnock,
+                    ) {
+                        Text("Knock")
+                    }
+                }
+            }
+        }
+    }
+}
+
+private sealed interface JoinTarget {
+    val id: String
+    val via: Set<String>
+
+    data class Alias(
+        val alias: String,
+        override val via: Set<String> = emptySet(),
+    ) : JoinTarget {
+        override val id: String = alias
+    }
+
+    data class Room(
+        val roomId: String,
+        override val via: Set<String> = emptySet(),
+    ) : JoinTarget {
+        override val id: String = roomId
+    }
+}
+
+private fun String.parseJoinTarget(): JoinTarget? {
+    val value = trim()
+    if (value.isEmpty()) return null
+
+    if (value.startsWith("https://matrix.to/#/") || value.startsWith("http://matrix.to/#/")) {
+        return value.parseMatrixToTarget()
+    }
+
+    if (value.startsWith("#") && RoomAliasId(value).isValid) {
+        return JoinTarget.Alias(value)
+    }
+
+    if (value.startsWith("!") && RoomId(value).isReasonable) {
+        return JoinTarget.Room(value)
+    }
+
+    return null
+}
+
+private fun String.parseMatrixToTarget(): JoinTarget? {
+    val fragment = Uri.parse(this).fragment.orEmpty().removePrefix("/")
+    if (fragment.isBlank()) return null
+
+    val idPart = fragment.substringBefore('?')
+    val queryPart = fragment.substringAfter('?', missingDelimiterValue = "")
+    val id = Uri.decode(idPart)
+    val via = Uri.parse("https://matrix.to/?$queryPart")
+        .getQueryParameters("via")
+        .filter { it.isNotBlank() }
+        .toSet()
+
+    return when {
+        id.startsWith("#") && RoomAliasId(id).isValid -> JoinTarget.Alias(id, via)
+        id.startsWith("!") && RoomId(id).isReasonable -> JoinTarget.Room(id, via)
+        else -> null
+    }
+}

app/src/main/java/ru/risdeveau/pixeldragon/ui/layout/RoomActions.kt

@@ -0,0 +1,110 @@
+/*
+ * Created by sweetbread
+ * Copyright (c) 2026. All rights reserved.
+ */
+
+package ru.risdeveau.pixeldragon.ui.layout
+
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.HorizontalDivider
+import androidx.compose.material3.ListItem
+import androidx.compose.material3.ModalBottomSheet
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+
+object RoomActionsRoutes {
+    const val Rooms = "rooms"
+    const val JoinRoom = "join-room"
+    const val CreateRoom = "create-room"
+    const val CreateSpace = "create-space"
+
+    fun titleFor(route: String?): String? {
+        return when (route) {
+            JoinRoom -> "Join room or space"
+            CreateRoom -> "Create room"
+            CreateSpace -> "Create space"
+            else -> null
+        }
+    }
+}
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun RoomActionsSheet(
+    onDismiss: () -> Unit,
+    onJoinRoom: () -> Unit,
+    onCreateRoom: () -> Unit,
+    onCreateSpace: () -> Unit,
+) {
+    ModalBottomSheet(onDismissRequest = onDismiss) {
+        Column(
+            modifier = Modifier
+                .fillMaxWidth()
+                .padding(horizontal = 16.dp),
+        ) {
+            Surface(
+                modifier = Modifier.fillMaxWidth(),
+                shape = RoundedCornerShape(24.dp),
+            ) {
+                Column {
+                    RoomActionItem(
+                        title = "Join room or space",
+                        subtitle = "Search public directories or paste a Matrix link",
+                        onClick = {
+                            onDismiss()
+                            onJoinRoom()
+                        },
+                    )
+
+                    HorizontalDivider(modifier = Modifier.padding(start = 16.dp))
+
+                    RoomActionItem(
+                        title = "Create room",
+                        subtitle = "Start a public or private room",
+                        onClick = {
+                            onDismiss()
+                            onCreateRoom()
+                        },
+                    )
+
+                    HorizontalDivider(modifier = Modifier.padding(start = 16.dp))
+
+                    RoomActionItem(
+                        title = "Create space",
+                        subtitle = "Group related rooms together",
+                        onClick = {
+                            onDismiss()
+                            onCreateSpace()
+                        },
+                    )
+                }
+            }
+
+            Spacer(Modifier.height(32.dp))
+        }
+    }
+}
+
+@Composable
+private fun RoomActionItem(
+    title: String,
+    subtitle: String,
+    onClick: () -> Unit,
+) {
+    ListItem(
+        modifier = Modifier.clickable(onClick = onClick),
+        headlineContent = { Text(title) },
+        supportingContent = { Text(subtitle) },
+        trailingContent = { Text("›") },
+    )
+}