first commit

src/main/java/org/pubvm/a3270/MainActivity.kt

@@ -0,0 +1,348 @@
+package org.pubvm.a3270
+
+import android.content.pm.PackageManager
+import android.os.Build
+import android.os.Bundle
+import android.view.KeyEvent
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.activity.viewModels
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.text.BasicTextField
+import androidx.compose.foundation.text.KeyboardActions
+import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.focus.FocusRequester
+import androidx.compose.ui.focus.focusRequester
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.SolidColor
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.platform.LocalSoftwareKeyboardController
+import androidx.compose.ui.text.TextStyle
+import androidx.compose.ui.text.TextRange
+import androidx.compose.ui.text.input.ImeAction
+import androidx.compose.ui.text.input.KeyboardCapitalization
+import androidx.compose.ui.text.input.KeyboardType
+import androidx.compose.ui.text.input.TextFieldValue
+import androidx.compose.ui.unit.dp
+import androidx.core.view.WindowCompat
+import org.lib3270j.protocol.DS3270Constants.AID_ENTER
+import org.pubvm.a3270.service.TerminalService
+import org.pubvm.a3270.storage.HostStorage
+import org.pubvm.a3270.ui.ConnectDialog
+import org.pubvm.a3270.ui.FileTransferDialog
+import org.pubvm.a3270.ui.TwoRowKeyBar
+import org.pubvm.a3270.ui.OiaStatusBar
+import org.pubvm.a3270.ui.TerminalView
+
+import androidx.compose.foundation.layout.size
+import androidx.compose.ui.input.key.Key
+import androidx.compose.ui.input.key.KeyEventType
+import androidx.compose.ui.input.key.key
+import androidx.compose.ui.input.key.onPreviewKeyEvent
+import androidx.compose.ui.input.key.type
+import androidx.compose.ui.platform.LocalLifecycleOwner
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.LifecycleEventObserver
+
+class MainActivity : ComponentActivity() {
+
+    private val viewModel: TerminalViewModel by viewModels()
+    private val isShiftPressedState = mutableStateOf(false)
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        WindowCompat.setDecorFitsSystemWindows(window, false)
+        window.setSoftInputMode(
+            android.view.WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE or
+            android.view.WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE
+        )
+
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+            if (checkSelfPermission(android.Manifest.permission.POST_NOTIFICATIONS) != PackageManager.PERMISSION_GRANTED) {
+                requestPermissions(arrayOf(android.Manifest.permission.POST_NOTIFICATIONS), 101)
+            }
+        }
+
+        setContent {
+            MaterialTheme(
+                colorScheme = darkColorScheme(
+                    background = Color(0xFF000000),
+                    surface = Color(0xFF1E1E1E)
+                )
+            ) {
+                MainScreen(
+                    viewModel = viewModel,
+                    isShiftPressed = isShiftPressedState.value,
+                    onClearShift = { isShiftPressedState.value = false }
+                )
+            }
+        }
+    }
+
+    override fun dispatchKeyEvent(event: KeyEvent): Boolean {
+        val shift = event.isShiftPressed || (event.metaState and KeyEvent.META_SHIFT_ON != 0)
+        if (isShiftPressedState.value != shift) {
+            isShiftPressedState.value = shift
+        }
+
+        if (event.action == KeyEvent.ACTION_DOWN) {
+            val keyCode = event.keyCode
+            if (keyCode in KeyEvent.KEYCODE_F1..KeyEvent.KEYCODE_F12) {
+                val fNum = keyCode - KeyEvent.KEYCODE_F1 + 1
+                val pfNum = if (shift) fNum + 12 else fNum
+                val pfAids = intArrayOf(
+                    org.lib3270j.protocol.DS3270Constants.AID_PF1, org.lib3270j.protocol.DS3270Constants.AID_PF2,
+                    org.lib3270j.protocol.DS3270Constants.AID_PF3, org.lib3270j.protocol.DS3270Constants.AID_PF4,
+                    org.lib3270j.protocol.DS3270Constants.AID_PF5, org.lib3270j.protocol.DS3270Constants.AID_PF6,
+                    org.lib3270j.protocol.DS3270Constants.AID_PF7, org.lib3270j.protocol.DS3270Constants.AID_PF8,
+                    org.lib3270j.protocol.DS3270Constants.AID_PF9, org.lib3270j.protocol.DS3270Constants.AID_PF10,
+                    org.lib3270j.protocol.DS3270Constants.AID_PF11, org.lib3270j.protocol.DS3270Constants.AID_PF12,
+                    org.lib3270j.protocol.DS3270Constants.AID_PF13, org.lib3270j.protocol.DS3270Constants.AID_PF14,
+                    org.lib3270j.protocol.DS3270Constants.AID_PF15, org.lib3270j.protocol.DS3270Constants.AID_PF16,
+                    org.lib3270j.protocol.DS3270Constants.AID_PF17, org.lib3270j.protocol.DS3270Constants.AID_PF18,
+                    org.lib3270j.protocol.DS3270Constants.AID_PF19, org.lib3270j.protocol.DS3270Constants.AID_PF20,
+                    org.lib3270j.protocol.DS3270Constants.AID_PF21, org.lib3270j.protocol.DS3270Constants.AID_PF22,
+                    org.lib3270j.protocol.DS3270Constants.AID_PF23, org.lib3270j.protocol.DS3270Constants.AID_PF24
+                )
+                viewModel.sendAid(pfAids[pfNum - 1])
+                if (shift) {
+                    isShiftPressedState.value = false
+                }
+                return true
+            } else if (keyCode == KeyEvent.KEYCODE_DPAD_LEFT) {
+                viewModel.cursorLeft()
+                return true
+            } else if (keyCode == KeyEvent.KEYCODE_DPAD_UP) {
+                viewModel.cursorUp()
+                return true
+            } else if (keyCode == KeyEvent.KEYCODE_DPAD_DOWN) {
+                viewModel.cursorDown()
+                return true
+            } else if (keyCode == KeyEvent.KEYCODE_DPAD_RIGHT) {
+                viewModel.cursorRight()
+                return true
+            } else if (keyCode == KeyEvent.KEYCODE_ENTER || keyCode == KeyEvent.KEYCODE_NUMPAD_ENTER) {
+                viewModel.sendAid(AID_ENTER)
+                return true
+            } else if (keyCode == KeyEvent.KEYCODE_TAB) {
+                if (event.isShiftPressed) {
+                    viewModel.backTab()
+                } else {
+                    viewModel.tab()
+                }
+                return true
+            }
+        }
+        return super.dispatchKeyEvent(event)
+    }
+}
+
+@Composable
+fun MainScreen(
+    viewModel: TerminalViewModel,
+    isShiftPressed: Boolean = false,
+    onClearShift: () -> Unit = {}
+) {
+    val context = LocalContext.current
+    val connectionState by viewModel.connectionState.collectAsState()
+    val screenBuffer by viewModel.screenBuffer.collectAsState()
+    val rows by viewModel.rows.collectAsState()
+    val cols by viewModel.cols.collectAsState()
+    val cursorAddr by viewModel.cursorAddress.collectAsState()
+    val oiaText by viewModel.oiaText.collectAsState()
+    val isKeyboardLocked by viewModel.isKeyboardLocked.collectAsState()
+    val screenVersion by viewModel.screenVersion.collectAsState()
+
+    var showConnectDialog by remember { mutableStateOf(false) }
+    var showFtDialog by remember { mutableStateOf(false) }
+
+    val focusRequester = remember { FocusRequester() }
+    val keyboardController = LocalSoftwareKeyboardController.current
+
+    var textFieldValue by remember { mutableStateOf(TextFieldValue("")) }
+
+    val lifecycleOwner = LocalLifecycleOwner.current
+    DisposableEffect(lifecycleOwner) {
+        val observer = LifecycleEventObserver { _, event ->
+            if (event == Lifecycle.Event.ON_STOP) {
+                viewModel.isAppInBackground = true
+            } else if (event == Lifecycle.Event.ON_START) {
+                viewModel.isAppInBackground = false
+            }
+        }
+        lifecycleOwner.lifecycle.addObserver(observer)
+        onDispose {
+            lifecycleOwner.lifecycle.removeObserver(observer)
+        }
+    }
+
+    LaunchedEffect(Unit) {
+        val autoHost = HostStorage.getAutoConnectHost(context)
+        if (autoHost != null && !connectionState.isConnected()) {
+            viewModel.connect(autoHost.host, autoHost.port, autoHost.model, autoHost.luName)
+        }
+    }
+
+    LaunchedEffect(connectionState) {
+        if (connectionState.isConnected()) {
+            val activeHost = viewModel.currentHost.ifBlank { "Mainframe" }
+            TerminalService.start(context, activeHost)
+        } else {
+            TerminalService.stop(context)
+        }
+    }
+
+    Box(
+        modifier = Modifier
+            .fillMaxSize()
+            .background(Color.Black)
+            .windowInsetsPadding(WindowInsets.systemBars)
+            .imePadding()
+    ) {
+        Column(
+            modifier = Modifier.fillMaxSize()
+        ) {
+            // Main 3270 Terminal Screen View (100% clean top screen, zero overlays)
+            TerminalView(
+                screenBuffer = screenBuffer,
+                rows = rows,
+                cols = cols,
+                cursorAddr = cursorAddr,
+                screenVersion = screenVersion,
+                onTapAddress = { addr ->
+                    viewModel.setCursor(addr)
+                    focusRequester.requestFocus()
+                    keyboardController?.show()
+                },
+                onPasteText = { text ->
+                    viewModel.pasteString(text)
+                },
+                modifier = Modifier.weight(1f)
+            )
+
+            // Transparent BasicTextField maintaining active Android IME connection
+            BasicTextField(
+                value = textFieldValue,
+                onValueChange = { newValue ->
+                    val text = newValue.text
+                    if (text.isNotEmpty()) {
+                        for (ch in text) {
+                            if (ch == '\n' || ch == '\r') {
+                                viewModel.sendAid(AID_ENTER)
+                            } else {
+                                viewModel.typeChar(ch)
+                            }
+                        }
+                        textFieldValue = TextFieldValue("")
+                        onClearShift()
+                    }
+                },
+                textStyle = TextStyle(color = Color.Transparent),
+                cursorBrush = SolidColor(Color.Transparent),
+                keyboardOptions = KeyboardOptions(
+                    keyboardType = KeyboardType.Ascii,
+                    autoCorrect = false,
+                    capitalization = KeyboardCapitalization.None,
+                    imeAction = ImeAction.None
+                ),
+                keyboardActions = KeyboardActions(
+                    onDone = { viewModel.sendAid(AID_ENTER) },
+                    onGo = { viewModel.sendAid(AID_ENTER) },
+                    onSend = { viewModel.sendAid(AID_ENTER) },
+                    onNext = {
+                        // Stubbed for future form field navigation
+                    }
+                ),
+                modifier = Modifier
+                    .size(1.dp)
+                    .focusRequester(focusRequester)
+                    .onPreviewKeyEvent { keyEvent ->
+                        if (keyEvent.type == KeyEventType.KeyDown && keyEvent.key == androidx.compose.ui.input.key.Key.Backspace) {
+                            viewModel.backspace()
+                            onClearShift()
+                            true
+                        } else {
+                            false
+                        }
+                    }
+            )
+
+            // Two Button Rows at the bottom (Row 1: System/Actions/Nav, Row 2: PF1-PF24)
+            TwoRowKeyBar(
+                connectionState = connectionState,
+                isShiftPressed = isShiftPressed,
+                onClearShift = onClearShift,
+                onConnectClick = { showConnectDialog = true },
+                onDisconnectClick = { viewModel.disconnect() },
+                onFtClick = { showFtDialog = true },
+                onSendAid = { aid ->
+                    viewModel.sendAid(aid)
+                    focusRequester.requestFocus()
+                },
+                onReset = {
+                    viewModel.resetKeyboard()
+                    focusRequester.requestFocus()
+                },
+                onTab = {
+                    viewModel.tab()
+                    focusRequester.requestFocus()
+                },
+                onBackTab = {
+                    viewModel.backTab()
+                    focusRequester.requestFocus()
+                },
+                onCursorLeft = {
+                    viewModel.cursorLeft()
+                    focusRequester.requestFocus()
+                },
+                onCursorUp = {
+                    viewModel.cursorUp()
+                    focusRequester.requestFocus()
+                },
+                onCursorDown = {
+                    viewModel.cursorDown()
+                    focusRequester.requestFocus()
+                },
+                onCursorRight = {
+                    viewModel.cursorRight()
+                    focusRequester.requestFocus()
+                }
+            )
+
+            // OIA Status Bar
+            OiaStatusBar(
+                connectionState = connectionState,
+                currentHost = viewModel.currentHost,
+                isKeyboardLocked = isKeyboardLocked,
+                oiaText = oiaText,
+                cursorAddr = cursorAddr,
+                rows = rows,
+                cols = cols
+            )
+        }
+    }
+
+    if (showConnectDialog) {
+        ConnectDialog(
+            onDismiss = { showConnectDialog = false },
+            onConnect = { host, port, model, luName ->
+                showConnectDialog = false
+                viewModel.connect(host, port, model, luName)
+                focusRequester.requestFocus()
+            }
+        )
+    }
+
+    if (showFtDialog) {
+        FileTransferDialog(
+            onDismiss = { showFtDialog = false },
+            onStartTransfer = { config ->
+                showFtDialog = false
+            }
+        )
+    }
+}

src/main/java/org/pubvm/a3270/TerminalViewModel.kt

@@ -0,0 +1,420 @@
+package org.pubvm.a3270
+
+import android.app.Application
+import androidx.lifecycle.AndroidViewModel
+import androidx.lifecycle.viewModelScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.asCoroutineDispatcher
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.launch
+import org.lib3270j.ConnectionConfig
+import org.lib3270j.ConnectionState
+import org.lib3270j.Telnet3270Client
+import org.lib3270j.TerminalModel
+import org.lib3270j.listener.ConnectionListener
+import org.lib3270j.listener.ScreenUpdateListener
+import org.lib3270j.protocol.DS3270Constants.faIsProtected
+import org.lib3270j.screen.ScreenBuffer
+import org.pubvm.a3270.service.TerminalService
+import java.util.concurrent.Executors
+import java.util.logging.Logger
+
+class TerminalViewModel(application: Application) : AndroidViewModel(application) {
+
+    private val log = Logger.getLogger(TerminalViewModel::class.java.name)
+
+    var isAppInBackground: Boolean = false
+
+    // Dedicated single-thread FIFO queue for all local keyboard and cursor actions
+    private val inputExecutor = Executors.newSingleThreadExecutor()
+    private val inputDispatcher = inputExecutor.asCoroutineDispatcher()
+
+    private val _connectionState = MutableStateFlow(ConnectionState.NOT_CONNECTED)
+    val connectionState: StateFlow<ConnectionState> = _connectionState.asStateFlow()
+
+    private val _screenBuffer = MutableStateFlow<ScreenBuffer?>(null)
+    val screenBuffer: StateFlow<ScreenBuffer?> = _screenBuffer.asStateFlow()
+
+    private val _rows = MutableStateFlow(24)
+    val rows: StateFlow<Int> = _rows.asStateFlow()
+
+    private val _cols = MutableStateFlow(80)
+    val cols: StateFlow<Int> = _cols.asStateFlow()
+
+    private val _cursorAddress = MutableStateFlow(0)
+    val cursorAddress: StateFlow<Int> = _cursorAddress.asStateFlow()
+
+    private val _oiaText = MutableStateFlow("Disconnected")
+    val oiaText: StateFlow<String> = _oiaText.asStateFlow()
+
+    private val _screenVersion = MutableStateFlow(0L)
+    val screenVersion: StateFlow<Long> = _screenVersion.asStateFlow()
+
+    private val _isKeyboardLocked = MutableStateFlow(false)
+    val isKeyboardLocked: StateFlow<Boolean> = _isKeyboardLocked.asStateFlow()
+
+    private var client: Telnet3270Client? = null
+    var currentHost: String = ""
+        private set
+
+    private var lastScreenContentHash: Int = 0
+    private var hasInitialScreenLoaded: Boolean = false
+
+    fun connect(host: String, port: Int = 23, modelNum: Int = 2, luName: String = "") {
+        if (_connectionState.value.isConnected()) return
+        currentHost = host
+        lastScreenContentHash = 0
+        hasInitialScreenLoaded = false
+
+        viewModelScope.launch(Dispatchers.IO) {
+            try {
+                _oiaText.value = "Connecting to $host:$port..."
+
+                val model = when (modelNum) {
+                    3 -> TerminalModel.IBM_3279_3
+                    4 -> TerminalModel.IBM_3279_4
+                    5 -> TerminalModel.IBM_3279_5
+                    else -> TerminalModel.IBM_3279_2
+                }
+
+                val config = ConnectionConfig(host, port, model).apply {
+                    if (luName.isNotBlank()) {
+                        setLuName(luName)
+                    }
+                }
+
+                val newClient = Telnet3270Client(config)
+                this@TerminalViewModel.client = newClient
+
+                newClient.addConnectionListener(object : ConnectionListener {
+                    override fun onConnectionStateChanged(oldState: ConnectionState, newState: ConnectionState) {
+                        _connectionState.value = newState
+                        _oiaText.value = if (newState.isFullSession()) {
+                            "3270 Connected ($host)"
+                        } else if (newState.isHalfConnected()) {
+                            "Connecting..."
+                        } else {
+                            "Disconnected"
+                        }
+                    }
+
+                    override fun onConnectionError(message: String) {
+                        log.warning("Connection error: $message")
+                        _oiaText.value = "Error: $message"
+                    }
+                })
+
+                newClient.inputProcessor.setLockStateListener { locked ->
+                    _isKeyboardLocked.value = locked
+                }
+
+                newClient.addScreenUpdateListener(object : ScreenUpdateListener {
+                    override fun onScreenUpdated() {
+                        val buf = newClient.screenBuffer
+                        _screenBuffer.value = buf
+                        if (buf != null) {
+                            _rows.value = buf.rows
+                            _cols.value = buf.cols
+                            _cursorAddress.value = buf.cursorAddress
+                        }
+                        _isKeyboardLocked.value = newClient.inputProcessor.isKeyboardLocked
+                        _screenVersion.value = System.currentTimeMillis()
+
+                        val newHash = computeScreenContentHash(buf)
+                        val contentChanged = (newHash != lastScreenContentHash)
+
+                        if (!hasInitialScreenLoaded) {
+                            if (buf != null && newHash != 0) {
+                                hasInitialScreenLoaded = true
+                                lastScreenContentHash = newHash
+                            }
+                        } else if (contentChanged) {
+                            lastScreenContentHash = newHash
+                            if (isAppInBackground) {
+                                val snippet = extractScreenSnippet(buf)
+                                val activeHost = currentHost.ifBlank { "Mainframe" }
+                                TerminalService.notifyScreenUpdate(getApplication(), activeHost, snippet)
+                            }
+                        }
+                    }
+
+                    override fun onSoundAlarm() {
+                        log.fine("Sound Alarm")
+                    }
+                })
+
+                _rows.value = model.defaultRows
+                _cols.value = model.defaultCols
+                _screenBuffer.value = newClient.screenBuffer
+
+                newClient.connect()
+            } catch (e: Exception) {
+                log.severe("Failed to connect: ${e.message}")
+                _connectionState.value = ConnectionState.NOT_CONNECTED
+                _oiaText.value = "Failed: ${e.localizedMessage ?: e.message}"
+            }
+        }
+    }
+
+    fun disconnect() {
+        viewModelScope.launch(Dispatchers.IO) {
+            try {
+                client?.disconnect()
+                client = null
+                _connectionState.value = ConnectionState.NOT_CONNECTED
+                _oiaText.value = "Disconnected"
+            } catch (e: Exception) {
+                log.warning("Error disconnecting: ${e.message}")
+            }
+        }
+    }
+
+    fun typeChar(ch: Char) {
+        val c = client ?: return
+        viewModelScope.launch(inputDispatcher) {
+            try {
+                val ip = c.inputProcessor
+                ip.isKeyboardLocked = false // Ensure keyboard lock is cleared on user typing
+                val buf = c.screenBuffer
+                var curAddr = buf.cursorAddress
+                if (buf.isFormatted) {
+                    val faVal = buf.getFieldAttributeAt(curAddr)
+                    if (faIsProtected(faVal.toInt() and 0xFF) || buf.getCell(curAddr).isFieldAttribute) {
+                        curAddr = buf.findNextUnprotected(curAddr)
+                        buf.cursorAddress = curAddr
+                    }
+                }
+                ip.typeCharacter(ch)
+                _cursorAddress.value = c.screenBuffer.cursorAddress
+                _screenVersion.value = System.currentTimeMillis()
+            } catch (e: Exception) {
+                log.warning("Error typing char: ${e.message}")
+            }
+        }
+    }
+
+    fun pasteString(text: String) {
+        val c = client ?: return
+        viewModelScope.launch(inputDispatcher) {
+            try {
+                val ip = c.inputProcessor
+                ip.isKeyboardLocked = false
+                for (ch in text) {
+                    if (ch == '\n' || ch == '\r') {
+                        ip.tab()
+                    } else if (ch >= ' ') {
+                        ip.typeCharacter(ch)
+                    }
+                }
+                _cursorAddress.value = c.screenBuffer.cursorAddress
+                _screenVersion.value = System.currentTimeMillis()
+            } catch (e: Exception) {
+                log.warning("Error pasting text: ${e.message}")
+            }
+        }
+    }
+
+    fun backspace() {
+        val c = client ?: return
+        viewModelScope.launch(inputDispatcher) {
+            try {
+                c.inputProcessor.isKeyboardLocked = false
+                c.inputProcessor.backspace()
+                _cursorAddress.value = c.screenBuffer.cursorAddress
+                _screenVersion.value = System.currentTimeMillis()
+            } catch (e: Exception) {
+                log.warning("Error backspacing: ${e.message}")
+            }
+        }
+    }
+
+    fun tab() {
+        val c = client ?: return
+        viewModelScope.launch(inputDispatcher) {
+            try {
+                c.inputProcessor.tab()
+                _cursorAddress.value = c.screenBuffer.cursorAddress
+                _screenVersion.value = System.currentTimeMillis()
+            } catch (e: Exception) {
+                log.warning("Error tabbing: ${e.message}")
+            }
+        }
+    }
+
+    fun backTab() {
+        val c = client ?: return
+        viewModelScope.launch(inputDispatcher) {
+            try {
+                c.inputProcessor.backTab()
+                _cursorAddress.value = c.screenBuffer.cursorAddress
+                _screenVersion.value = System.currentTimeMillis()
+            } catch (e: Exception) {
+                log.warning("Error back-tabbing: ${e.message}")
+            }
+        }
+    }
+
+    fun resetKeyboard() {
+        val c = client ?: return
+        viewModelScope.launch(inputDispatcher) {
+            try {
+                c.inputProcessor.reset()
+                _screenVersion.value = System.currentTimeMillis()
+            } catch (e: Exception) {
+                log.warning("Error resetting keyboard: ${e.message}")
+            }
+        }
+    }
+
+    fun sendAid(aidCode: Int) {
+        val c = client ?: return
+        viewModelScope.launch(inputDispatcher) {
+            try {
+                c.inputProcessor.setKeyboardLocked(false)
+                c.inputProcessor.sendAid(aidCode)
+                _cursorAddress.value = c.screenBuffer.cursorAddress
+                _screenVersion.value = System.currentTimeMillis()
+            } catch (e: Exception) {
+                log.warning("Error sending AID: ${e.message}")
+            }
+        }
+    }
+
+    fun setCursor(baddr: Int) {
+        val buf = _screenBuffer.value ?: return
+        if (baddr in 0 until (buf.rows * buf.cols)) {
+            buf.cursorAddress = baddr
+            _cursorAddress.value = baddr
+            _screenVersion.value = System.currentTimeMillis()
+        }
+    }
+
+    fun cursorLeft() {
+        val c = client ?: return
+        viewModelScope.launch(inputDispatcher) {
+            try {
+                c.inputProcessor.cursorLeft()
+                _cursorAddress.value = c.screenBuffer.cursorAddress
+                _screenVersion.value = System.currentTimeMillis()
+            } catch (e: Exception) {
+                log.warning("Error cursorLeft: ${e.message}")
+            }
+        }
+    }
+
+    fun cursorUp() {
+        val c = client ?: return
+        viewModelScope.launch(inputDispatcher) {
+            try {
+                c.inputProcessor.cursorUp()
+                _cursorAddress.value = c.screenBuffer.cursorAddress
+                _screenVersion.value = System.currentTimeMillis()
+            } catch (e: Exception) {
+                log.warning("Error cursorUp: ${e.message}")
+            }
+        }
+    }
+
+    fun cursorDown() {
+        val c = client ?: return
+        viewModelScope.launch(inputDispatcher) {
+            try {
+                c.inputProcessor.cursorDown()
+                _cursorAddress.value = c.screenBuffer.cursorAddress
+                _screenVersion.value = System.currentTimeMillis()
+            } catch (e: Exception) {
+                log.warning("Error cursorDown: ${e.message}")
+            }
+        }
+    }
+
+    fun cursorRight() {
+        val c = client ?: return
+        viewModelScope.launch(inputDispatcher) {
+            try {
+                c.inputProcessor.cursorRight()
+                _cursorAddress.value = c.screenBuffer.cursorAddress
+                _screenVersion.value = System.currentTimeMillis()
+            } catch (e: Exception) {
+                log.warning("Error cursorRight: ${e.message}")
+            }
+        }
+    }
+
+    private fun extractScreenSnippet(buf: ScreenBuffer?): String {
+        if (buf == null) return "Mainframe screen update received"
+        val rows = buf.rows
+        val cols = buf.cols
+        if (rows <= 0 || cols <= 0) return "Mainframe screen update received"
+
+        val curAddr = _cursorAddress.value
+        val cursorRow = (curAddr / cols).coerceIn(0, rows - 1)
+
+        // 1. Check bottom 3 lines first (where 3270 status, errors, reader & I/S MSGs land)
+        val minBottomRow = (rows - 3).coerceAtLeast(1)
+        for (r in (rows - 1) downTo minBottomRow) {
+            val line = getLineText(buf, r, cols).trim()
+            if (line.length >= 4 && !line.startsWith("***") && !line.startsWith("===")) {
+                return line
+            }
+        }
+
+        // 2. Check cursor row if not row 0
+        if (cursorRow > 0) {
+            val cursorLine = getLineText(buf, cursorRow, cols).trim()
+            if (cursorLine.length >= 4) {
+                return cursorLine
+            }
+        }
+
+        // 3. Scan rows from bottom to top, skipping static header row 0
+        for (r in (rows - 1) downTo 1) {
+            val line = getLineText(buf, r, cols).trim()
+            if (line.length >= 4) {
+                return line
+            }
+        }
+
+        return getLineText(buf, 0, cols).trim().ifBlank { "Mainframe screen update received" }
+    }
+
+    private fun getLineText(buf: ScreenBuffer, row: Int, cols: Int): String {
+        val sb = StringBuilder()
+        for (c in 0 until cols) {
+            val addr = row * cols + c
+            val cell = buf.getCell(addr)
+            if (cell != null && !cell.isFieldAttribute) {
+                val ch = cell.ucs4
+                if (ch in '!'..'~' || ch.code > 127) {
+                    sb.append(ch)
+                } else {
+                    sb.append(' ')
+                }
+            } else {
+                sb.append(' ')
+            }
+        }
+        return sb.toString().replace(Regex("\\s+"), " ").trim()
+    }
+
+    private fun computeScreenContentHash(buf: ScreenBuffer?): Int {
+        if (buf == null) return 0
+        val sb = StringBuilder()
+        val total = buf.rows * buf.cols
+        for (i in 0 until total) {
+            val cell = buf.getCell(i)
+            if (cell != null && !cell.isFieldAttribute && cell.ucs4 > ' ' && cell.ucs4.code != 0xFFFF) {
+                sb.append(cell.ucs4)
+            }
+        }
+        return sb.toString().hashCode()
+    }
+
+    override fun onCleared() {
+        super.onCleared()
+        client?.disconnect()
+        inputExecutor.shutdown()
+    }
+}

src/main/java/org/pubvm/a3270/service/TerminalService.kt

@@ -0,0 +1,176 @@
+package org.pubvm.a3270.service
+
+import android.app.Notification
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.app.PendingIntent
+import android.app.Service
+import android.content.Context
+import android.content.Intent
+import android.os.Build
+import android.os.IBinder
+import androidx.core.app.NotificationCompat
+import org.pubvm.a3270.MainActivity
+import org.pubvm.a3270.R
+
+class TerminalService : Service() {
+
+    override fun onBind(intent: Intent?): IBinder? = null
+
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        val action = intent?.action
+        if (action == ACTION_STOP) {
+            try {
+                stopForeground(STOP_FOREGROUND_REMOVE)
+                val manager = getSystemService(Context.NOTIFICATION_SERVICE) as? NotificationManager
+                manager?.cancel(NOTIFICATION_ID)
+            } catch (e: Exception) {
+                e.printStackTrace()
+            }
+            stopSelf()
+            return START_NOT_STICKY
+        }
+
+        val host = intent?.getStringExtra(EXTRA_HOST) ?: "Mainframe"
+        createNotificationChannels()
+
+        val notificationIntent = Intent(this, MainActivity::class.java).apply {
+            addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP)
+        }
+        val pendingIntent = PendingIntent.getActivity(
+            this, 0, notificationIntent,
+            PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE
+        )
+
+        val notification: Notification = NotificationCompat.Builder(this, SERVICE_CHANNEL_ID)
+            .setContentTitle("a3270 Active Session")
+            .setContentText("Connected to $host (Socket Active)")
+            .setSmallIcon(R.drawable.ic_notification)
+            .setOngoing(true)
+            .setCategory(NotificationCompat.CATEGORY_SERVICE)
+            .setContentIntent(pendingIntent)
+            .setPriority(NotificationCompat.PRIORITY_DEFAULT)
+            .setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
+            .build()
+
+        try {
+            if (Build.VERSION.SDK_INT >= 34) {
+                startForeground(
+                    NOTIFICATION_ID,
+                    notification,
+                    android.content.pm.ServiceInfo.FOREGROUND_SERVICE_TYPE_SPECIAL_USE
+                )
+            } else {
+                startForeground(NOTIFICATION_ID, notification)
+            }
+            val manager = getSystemService(Context.NOTIFICATION_SERVICE) as? NotificationManager
+            manager?.notify(NOTIFICATION_ID, notification)
+        } catch (e: Exception) {
+            e.printStackTrace()
+        }
+        return START_STICKY
+    }
+
+    private fun createNotificationChannels() {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            try {
+                val manager = getSystemService(NotificationManager::class.java) ?: return
+
+                // Delete obsolete channels so system settings reset cleanly
+                try {
+                    manager.deleteNotificationChannel("a3270_connection_channel")
+                    manager.deleteNotificationChannel("a3270_connection_v2")
+                } catch (_: Exception) {}
+
+                // 1. Service Persistent Channel
+                val serviceChannel = NotificationChannel(
+                    SERVICE_CHANNEL_ID,
+                    "a3270 Terminal Connection",
+                    NotificationManager.IMPORTANCE_DEFAULT
+                ).apply {
+                    description = "Keeps the 3270 TCP socket connection alive in the background"
+                    setShowBadge(true)
+                }
+                manager.createNotificationChannel(serviceChannel)
+
+                // 2. Screen Update Notification Channel
+                val updateChannel = NotificationChannel(
+                    UPDATE_CHANNEL_ID,
+                    "a3270 Screen Updates",
+                    NotificationManager.IMPORTANCE_HIGH
+                ).apply {
+                    description = "Notifies when mainframe screen updates occur in the background"
+                    enableVibration(true)
+                }
+                manager.createNotificationChannel(updateChannel)
+            } catch (e: Exception) {
+                e.printStackTrace()
+            }
+        }
+    }
+
+    companion object {
+        private const val SERVICE_CHANNEL_ID = "a3270_connection_v3"
+        private const val UPDATE_CHANNEL_ID = "a3270_screen_updates"
+        private const val NOTIFICATION_ID = 32701
+        private const val UPDATE_NOTIFICATION_ID = 32702
+        const val EXTRA_HOST = "extra_host"
+        const val ACTION_STOP = "action_stop"
+
+        fun start(context: Context, host: String) {
+            try {
+                val intent = Intent(context, TerminalService::class.java).apply {
+                    putExtra(EXTRA_HOST, host)
+                }
+                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+                    context.startForegroundService(intent)
+                } else {
+                    context.startService(intent)
+                }
+            } catch (e: Exception) {
+                e.printStackTrace()
+            }
+        }
+
+        fun stop(context: Context) {
+            try {
+                val intent = Intent(context, TerminalService::class.java).apply {
+                    action = ACTION_STOP
+                }
+                context.startService(intent)
+            } catch (e: Exception) {
+                e.printStackTrace()
+            }
+        }
+
+        fun notifyScreenUpdate(context: Context, host: String, textSnippet: String) {
+            try {
+                val manager = context.getSystemService(Context.NOTIFICATION_SERVICE) as? NotificationManager ?: return
+
+                val intent = Intent(context, MainActivity::class.java).apply {
+                    addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP)
+                }
+                val pendingIntent = PendingIntent.getActivity(
+                    context, 0, intent,
+                    PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE
+                )
+
+                val displayHost = if (host.isNotBlank()) host else "Mainframe"
+                val notification = NotificationCompat.Builder(context, UPDATE_CHANNEL_ID)
+                    .setContentTitle("$displayHost has an alert.")
+                    .setContentText(textSnippet)
+                    .setStyle(NotificationCompat.BigTextStyle().bigText(textSnippet))
+                    .setSmallIcon(R.drawable.ic_notification)
+                    .setAutoCancel(true)
+                    .setPriority(NotificationCompat.PRIORITY_HIGH)
+                    .setDefaults(NotificationCompat.DEFAULT_ALL)
+                    .setContentIntent(pendingIntent)
+                    .build()
+
+                manager.notify(UPDATE_NOTIFICATION_ID, notification)
+            } catch (e: Exception) {
+                e.printStackTrace()
+            }
+        }
+    }
+}

src/main/java/org/pubvm/a3270/storage/HostStorage.kt

@@ -0,0 +1,105 @@
+package org.pubvm.a3270.storage
+
+import android.content.Context
+import android.content.SharedPreferences
+import org.json.JSONArray
+import org.json.JSONObject
+import java.util.UUID
+
+data class SavedHost(
+    val id: String = UUID.randomUUID().toString(),
+    val name: String,
+    val host: String,
+    val port: Int = 23,
+    val model: Int = 2,
+    val luName: String = "",
+    val autoConnect: Boolean = false
+) {
+    fun toJson(): JSONObject {
+        return JSONObject().apply {
+            put("id", id)
+            put("name", name)
+            put("host", host)
+            put("port", port)
+            put("model", model)
+            put("luName", luName)
+            put("autoConnect", autoConnect)
+        }
+    }
+
+    companion object {
+        fun fromJson(json: JSONObject): SavedHost {
+            return SavedHost(
+                id = json.optString("id", UUID.randomUUID().toString()),
+                name = json.optString("name", "Mainframe"),
+                host = json.optString("host", "127.0.0.1"),
+                port = json.optInt("port", 23),
+                model = json.optInt("model", 2),
+                luName = json.optString("luName", ""),
+                autoConnect = json.optBoolean("autoConnect", false)
+            )
+        }
+    }
+}
+
+object HostStorage {
+    private const val PREFS_NAME = "a3270_host_prefs"
+    private const val KEY_SAVED_HOSTS = "saved_hosts"
+
+    private fun getPrefs(context: Context): SharedPreferences {
+        return context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
+    }
+
+    fun getSavedHosts(context: Context): List<SavedHost> {
+        val jsonStr = getPrefs(context).getString(KEY_SAVED_HOSTS, null) ?: return emptyList()
+        val list = mutableListOf<SavedHost>()
+        try {
+            val jsonArray = JSONArray(jsonStr)
+            for (i in 0 until jsonArray.length()) {
+                val obj = jsonArray.getJSONObject(i)
+                list.add(SavedHost.fromJson(obj))
+            }
+        } catch (e: Exception) {
+            e.printStackTrace()
+        }
+        return list
+    }
+
+    fun saveHost(context: Context, host: SavedHost) {
+        val currentHosts = getSavedHosts(context).toMutableList()
+        val index = currentHosts.indexOfFirst { it.id == host.id }
+
+        // If this host is set to autoConnect, unset autoConnect on all others
+        val updatedHost = if (host.autoConnect) {
+            currentHosts.indices.forEach { i ->
+                currentHosts[i] = currentHosts[i].copy(autoConnect = false)
+            }
+            host
+        } else {
+            host
+        }
+
+        if (index >= 0) {
+            currentHosts[index] = updatedHost
+        } else {
+            currentHosts.add(updatedHost)
+        }
+
+        saveAll(context, currentHosts)
+    }
+
+    fun deleteHost(context: Context, hostId: String) {
+        val currentHosts = getSavedHosts(context).filter { it.id != hostId }
+        saveAll(context, currentHosts)
+    }
+
+    fun getAutoConnectHost(context: Context): SavedHost? {
+        return getSavedHosts(context).firstOrNull { it.autoConnect }
+    }
+
+    private fun saveAll(context: Context, hosts: List<SavedHost>) {
+        val array = JSONArray()
+        hosts.forEach { array.put(it.toJson()) }
+        getPrefs(context).edit().putString(KEY_SAVED_HOSTS, array.toString()).apply()
+    }
+}

src/main/java/org/pubvm/a3270/ui/ConnectDialog.kt

@@ -0,0 +1,312 @@
+package org.pubvm.a3270.ui
+
+import androidx.compose.foundation.border
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import androidx.compose.ui.window.Dialog
+import androidx.compose.ui.focus.FocusRequester
+import androidx.compose.ui.focus.focusRequester
+import androidx.compose.ui.platform.LocalSoftwareKeyboardController
+import org.pubvm.a3270.storage.HostStorage
+import org.pubvm.a3270.storage.SavedHost
+
+@Composable
+fun ConnectDialog(
+    onDismiss: () -> Unit,
+    onConnect: (host: String, port: Int, model: Int, luName: String) -> Unit
+) {
+    val context = LocalContext.current
+    var savedHosts by remember { mutableStateOf(HostStorage.getSavedHosts(context)) }
+    var selectedHostId by remember { mutableStateOf<String?>(null) }
+
+    var profileName by remember { mutableStateOf("") }
+    var host by remember { mutableStateOf("127.0.0.1") }
+    var portStr by remember { mutableStateOf("23") }
+    var modelNum by remember { mutableIntStateOf(2) }
+    var luName by remember { mutableStateOf("") }
+    var autoConnect by remember { mutableStateOf(false) }
+
+    fun loadProfile(saved: SavedHost) {
+        selectedHostId = saved.id
+        profileName = saved.name
+        host = saved.host
+        portStr = saved.port.toString()
+        modelNum = saved.model
+        luName = saved.luName
+        autoConnect = saved.autoConnect
+    }
+
+    fun clearFields() {
+        selectedHostId = null
+        profileName = ""
+        host = "127.0.0.1"
+        portStr = "23"
+        modelNum = 2
+        luName = ""
+        autoConnect = false
+    }
+
+    fun saveCurrentProfile(): SavedHost? {
+        val port = portStr.toIntOrNull() ?: 23
+        if (host.isBlank()) return null
+        val nameToSave = profileName.ifBlank { "${host.trim()}:$port" }
+        val hostToSave = SavedHost(
+            id = selectedHostId ?: java.util.UUID.randomUUID().toString(),
+            name = nameToSave,
+            host = host.trim(),
+            port = port,
+            model = modelNum,
+            luName = luName.trim(),
+            autoConnect = autoConnect
+        )
+        HostStorage.saveHost(context, hostToSave)
+        savedHosts = HostStorage.getSavedHosts(context)
+        selectedHostId = hostToSave.id
+        return hostToSave
+    }
+
+    val focusRequester = remember { FocusRequester() }
+    val keyboardController = LocalSoftwareKeyboardController.current
+
+    LaunchedEffect(Unit) {
+        kotlinx.coroutines.delay(150)
+        focusRequester.requestFocus()
+        keyboardController?.show()
+    }
+
+    Dialog(onDismissRequest = onDismiss) {
+        Surface(
+            shape = RoundedCornerShape(12.dp),
+            color = Color(0xFF1E1E1E),
+            tonalElevation = 6.dp,
+            modifier = Modifier
+                .fillMaxWidth(0.96f)
+                .wrapContentHeight()
+        ) {
+            Column(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(14.dp),
+                verticalArrangement = Arrangement.spacedBy(6.dp)
+            ) {
+                // Title Row
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.SpaceBetween,
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    Text("Connect / Manage Hosts", fontWeight = FontWeight.Bold, fontSize = 15.sp, color = Color.White)
+                    TextButton(
+                        onClick = { clearFields() },
+                        contentPadding = PaddingValues(horizontal = 6.dp, vertical = 2.dp)
+                    ) {
+                        Text("+ New Profile", fontSize = 12.sp)
+                    }
+                }
+
+                // Scrollable Content Container
+                Box(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .heightIn(max = 300.dp)
+                        .verticalScroll(rememberScrollState())
+                ) {
+                    Column(
+                        modifier = Modifier.fillMaxWidth(),
+                        verticalArrangement = Arrangement.spacedBy(6.dp)
+                    ) {
+                        // Saved Profiles List
+                        if (savedHosts.isNotEmpty()) {
+                            Text("Saved Host Profiles:", fontSize = 11.sp, fontWeight = FontWeight.Bold, color = Color.Gray)
+                            Box(
+                                modifier = Modifier
+                                    .fillMaxWidth()
+                                    .heightIn(max = 95.dp)
+                                    .verticalScroll(rememberScrollState())
+                            ) {
+                                Column(
+                                    verticalArrangement = Arrangement.spacedBy(4.dp),
+                                    modifier = Modifier.fillMaxWidth()
+                                ) {
+                                    savedHosts.forEach { profile ->
+                                        val isSelected = profile.id == selectedHostId
+                                        Surface(
+                                            shape = RoundedCornerShape(6.dp),
+                                            color = if (isSelected) Color(0xFF2C2D30) else Color(0xFF161719),
+                                            modifier = Modifier
+                                                .fillMaxWidth()
+                                                .border(
+                                                    width = if (isSelected) 1.dp else 0.dp,
+                                                    color = if (isSelected) Color(0xFF4DABF7) else Color.Transparent,
+                                                    shape = RoundedCornerShape(6.dp)
+                                                )
+                                                .clickable { loadProfile(profile) }
+                                        ) {
+                                            Row(
+                                                modifier = Modifier
+                                                    .fillMaxWidth()
+                                                    .padding(horizontal = 8.dp, vertical = 4.dp),
+                                                horizontalArrangement = Arrangement.SpaceBetween,
+                                                verticalAlignment = Alignment.CenterVertically
+                                            ) {
+                                                Column(modifier = Modifier.weight(1f)) {
+                                                    Row(verticalAlignment = Alignment.CenterVertically) {
+                                                        Text(profile.name, fontWeight = FontWeight.Bold, fontSize = 12.sp, color = Color.White)
+                                                        if (profile.autoConnect) {
+                                                            Spacer(modifier = Modifier.width(6.dp))
+                                                            Surface(
+                                                                color = Color(0xFF2B8A3E),
+                                                                shape = RoundedCornerShape(4.dp)
+                                                            ) {
+                                                                Text(
+                                                                    "AUTO",
+                                                                    fontSize = 9.sp,
+                                                                    fontWeight = FontWeight.Bold,
+                                                                    color = Color.White,
+                                                                    modifier = Modifier.padding(horizontal = 4.dp, vertical = 1.dp)
+                                                                )
+                                                            }
+                                                        }
+                                                    }
+                                                    Text("${profile.host}:${profile.port} (M${profile.model})", fontSize = 11.sp, color = Color.Gray)
+                                                }
+
+                                                Row {
+                                                    TextButton(onClick = { loadProfile(profile) }, contentPadding = PaddingValues(horizontal = 4.dp)) {
+                                                        Text("Edit", fontSize = 11.sp)
+                                                    }
+                                                    TextButton(
+                                                        onClick = {
+                                                            HostStorage.deleteHost(context, profile.id)
+                                                            savedHosts = HostStorage.getSavedHosts(context)
+                                                            if (selectedHostId == profile.id) {
+                                                                clearFields()
+                                                            }
+                                                        },
+                                                        contentPadding = PaddingValues(horizontal = 4.dp),
+                                                        colors = ButtonDefaults.textButtonColors(contentColor = Color(0xFFFF6B6B))
+                                                    ) {
+                                                        Text("Delete", fontSize = 11.sp)
+                                                    }
+                                                }
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+                        }
+
+                        Text(
+                            text = if (selectedHostId != null) "Editing Profile:" else "New Profile Details:",
+                            fontSize = 11.sp,
+                            fontWeight = FontWeight.Bold,
+                            color = Color.Gray
+                        )
+
+                        OutlinedTextField(
+                            value = profileName,
+                            onValueChange = { profileName = it },
+                            label = { Text("Profile Name (Optional)") },
+                            singleLine = true,
+                            modifier = Modifier.fillMaxWidth()
+                        )
+
+                        OutlinedTextField(
+                            value = host,
+                            onValueChange = { host = it },
+                            label = { Text("Host / IP Address") },
+                            singleLine = true,
+                            modifier = Modifier
+                                .fillMaxWidth()
+                                .focusRequester(focusRequester)
+                        )
+
+                        OutlinedTextField(
+                            value = portStr,
+                            onValueChange = { portStr = it },
+                            label = { Text("Port (default 23)") },
+                            singleLine = true,
+                            modifier = Modifier.fillMaxWidth()
+                        )
+
+                        Row(
+                            horizontalArrangement = Arrangement.spacedBy(6.dp),
+                            verticalAlignment = Alignment.CenterVertically
+                        ) {
+                            Text("Model:", fontSize = 11.sp, color = Color.Gray)
+                            listOf(2, 3, 4, 5).forEach { m ->
+                                FilterChip(
+                                    selected = (modelNum == m),
+                                    onClick = { modelNum = m },
+                                    label = { Text("M$m", fontSize = 11.sp) }
+                                )
+                            }
+                        }
+
+                        OutlinedTextField(
+                            value = luName,
+                            onValueChange = { luName = it },
+                            label = { Text("LU Name (Optional)") },
+                            singleLine = true,
+                            modifier = Modifier.fillMaxWidth()
+                        )
+
+                        Row(
+                            verticalAlignment = Alignment.CenterVertically,
+                            modifier = Modifier
+                                .fillMaxWidth()
+                                .clickable { autoConnect = !autoConnect }
+                        ) {
+                            Checkbox(
+                                checked = autoConnect,
+                                onCheckedChange = { autoConnect = it }
+                            )
+                            Spacer(modifier = Modifier.width(4.dp))
+                            Text("Auto-connect on app startup", fontSize = 12.sp)
+                        }
+                    }
+                }
+
+                // Action Buttons Row
+                Row(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .padding(top = 4.dp),
+                    horizontalArrangement = Arrangement.End,
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    TextButton(onClick = onDismiss) {
+                        Text("Cancel")
+                    }
+                    Spacer(modifier = Modifier.width(4.dp))
+                    OutlinedButton(onClick = { saveCurrentProfile() }) {
+                        Text("Save")
+                    }
+                    Spacer(modifier = Modifier.width(4.dp))
+                    Button(
+                        onClick = {
+                            val saved = saveCurrentProfile()
+                            if (saved != null) {
+                                onConnect(saved.host, saved.port, saved.model, saved.luName)
+                            }
+                        }
+                    ) {
+                        Text("Connect")
+                    }
+                }
+            }
+        }
+    }
+}

src/main/java/org/pubvm/a3270/ui/FileTransferDialog.kt

@@ -0,0 +1,147 @@
+package org.pubvm.a3270.ui
+
+import androidx.compose.foundation.layout.*
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.focus.FocusRequester
+import androidx.compose.ui.focus.focusRequester
+import androidx.compose.ui.platform.LocalSoftwareKeyboardController
+import androidx.compose.ui.unit.dp
+import org.lib3270j.ft.FTConfig
+
+@Composable
+fun FileTransferDialog(
+    onDismiss: () -> Unit,
+    onStartTransfer: (FTConfig) -> Unit
+) {
+    var hostFile by remember { mutableStateOf("") }
+    var localFile by remember { mutableStateOf("") }
+    var isReceive by remember { mutableStateOf(true) }
+    var isAscii by remember { mutableStateOf(true) }
+    var hostType by remember { mutableStateOf(FTConfig.HostType.TSO) }
+
+    val focusRequester = remember { FocusRequester() }
+    val keyboardController = LocalSoftwareKeyboardController.current
+
+    LaunchedEffect(Unit) {
+        kotlinx.coroutines.delay(150)
+        focusRequester.requestFocus()
+        keyboardController?.show()
+    }
+
+    AlertDialog(
+        onDismissRequest = onDismiss,
+        title = { Text("IND\$FILE File Transfer") },
+        text = {
+            Column(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(vertical = 4.dp),
+                verticalArrangement = Arrangement.spacedBy(8.dp)
+            ) {
+                OutlinedTextField(
+                    value = hostFile,
+                    onValueChange = { hostFile = it },
+                    label = { Text("Host File Name") },
+                    singleLine = true,
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .focusRequester(focusRequester)
+                )
+
+                OutlinedTextField(
+                    value = localFile,
+                    onValueChange = { localFile = it },
+                    label = { Text("Local File Path") },
+                    singleLine = true,
+                    modifier = Modifier.fillMaxWidth()
+                )
+
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.SpaceBetween,
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    Text("Direction:")
+                    Row {
+                        FilterChip(
+                            selected = isReceive,
+                            onClick = { isReceive = true },
+                            label = { Text("Receive (GET)") }
+                        )
+                        Spacer(modifier = Modifier.width(4.dp))
+                        FilterChip(
+                            selected = !isReceive,
+                            onClick = { isReceive = false },
+                            label = { Text("Send (PUT)") }
+                        )
+                    }
+                }
+
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.SpaceBetween,
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    Text("Mode:")
+                    Row {
+                        FilterChip(
+                            selected = isAscii,
+                            onClick = { isAscii = true },
+                            label = { Text("ASCII") }
+                        )
+                        Spacer(modifier = Modifier.width(4.dp))
+                        FilterChip(
+                            selected = !isAscii,
+                            onClick = { isAscii = false },
+                            label = { Text("Binary") }
+                        )
+                    }
+                }
+
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.SpaceBetween,
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    Text("Host:")
+                    Row {
+                        FTConfig.HostType.values().forEach { ht ->
+                            FilterChip(
+                                selected = (hostType == ht),
+                                onClick = { hostType = ht },
+                                label = { Text(ht.name) }
+                            )
+                            Spacer(modifier = Modifier.width(4.dp))
+                        }
+                    }
+                }
+            }
+        },
+        confirmButton = {
+            Button(
+                onClick = {
+                    if (hostFile.isNotBlank() && localFile.isNotBlank()) {
+                        val config = FTConfig().apply {
+                            setHostFilename(hostFile.trim())
+                            setLocalFilename(localFile.trim())
+                            setReceive(isReceive)
+                            setAscii(isAscii)
+                            setHostType(hostType)
+                        }
+                        onStartTransfer(config)
+                    }
+                }
+            ) {
+                Text("Start Transfer")
+            }
+        },
+        dismissButton = {
+            TextButton(onClick = onDismiss) {
+                Text("Cancel")
+            }
+        }
+    )
+}

src/main/java/org/pubvm/a3270/ui/FunctionKeyBar.kt

@@ -0,0 +1,213 @@
+package org.pubvm.a3270.ui
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.horizontalScroll
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import androidx.compose.ui.focus.focusProperties
+import org.lib3270j.ConnectionState
+import org.lib3270j.protocol.DS3270Constants.*
+
+@Composable
+fun TwoRowKeyBar(
+    connectionState: ConnectionState,
+    isShiftPressed: Boolean = false,
+    onClearShift: () -> Unit = {},
+    onConnectClick: () -> Unit,
+    onDisconnectClick: () -> Unit,
+    onFtClick: () -> Unit,
+    onSendAid: (Int) -> Unit,
+    onReset: () -> Unit,
+    onTab: () -> Unit,
+    onBackTab: () -> Unit,
+    onCursorLeft: () -> Unit = {},
+    onCursorUp: () -> Unit = {},
+    onCursorDown: () -> Unit = {},
+    onCursorRight: () -> Unit = {},
+    modifier: Modifier = Modifier
+) {
+    var menuExpanded by remember { mutableStateOf(false) }
+
+    Column(
+        modifier = modifier
+            .fillMaxWidth()
+            .background(Color(0xFF161719))
+    ) {
+        // Row 1: System & Quick Action Keys (Static 12-key row matching Row 2 columns)
+        Row(
+            modifier = Modifier
+                .fillMaxWidth()
+                .height(35.dp)
+                .padding(horizontal = 1.dp, vertical = 1.dp),
+            verticalAlignment = Alignment.CenterVertically
+        ) {
+            // 1. Menu Dropdown Button (Connect/Disconnect/FT)
+            Box(modifier = Modifier.weight(1f)) {
+                KeyButton(
+                    label = "⋮",
+                    color = Color(0xFF343A40),
+                    modifier = Modifier.fillMaxWidth(),
+                    innerPaddingHorizontal = 0.dp,
+                    onClick = { menuExpanded = true }
+                )
+                DropdownMenu(
+                    expanded = menuExpanded,
+                    onDismissRequest = { menuExpanded = false },
+                    modifier = Modifier.background(Color(0xFF2C2D30))
+                ) {
+                    if (!connectionState.isConnected()) {
+                        DropdownMenuItem(
+                            text = { Text("Connect", color = Color.White, fontWeight = FontWeight.SemiBold) },
+                            onClick = {
+                                menuExpanded = false
+                                onConnectClick()
+                            }
+                        )
+                    } else {
+                        DropdownMenuItem(
+                            text = { Text("Disconnect", color = Color(0xFFFF6B6B), fontWeight = FontWeight.SemiBold) },
+                            onClick = {
+                                menuExpanded = false
+                                onDisconnectClick()
+                            }
+                        )
+                        DropdownMenuItem(
+                            text = { Text("File Transfer (FT)", color = Color.White, fontWeight = FontWeight.SemiBold) },
+                            onClick = {
+                                menuExpanded = false
+                                onFtClick()
+                            }
+                        )
+                    }
+                }
+            }
+
+            // 2. TAB / BTAB depending on Shift state
+            val tabLabel = if (isShiftPressed) "BTAB" else "TAB"
+            KeyButton(
+                label = tabLabel,
+                color = Color(0xFF1C7ED6),
+                modifier = Modifier.weight(1f),
+                innerPaddingHorizontal = 0.dp,
+                onClick = {
+                    if (isShiftPressed) {
+                        onBackTab()
+                        onClearShift()
+                    } else {
+                        onTab()
+                    }
+                }
+            )
+
+            // 3. RESET
+            KeyButton("RESET", Color(0xFFE67700), modifier = Modifier.weight(1f), innerPaddingHorizontal = 0.dp, onClick = onReset)
+
+            // 4. ENTER
+            KeyButton("ENTER", Color(0xFF2B8A3E), modifier = Modifier.weight(1f), innerPaddingHorizontal = 0.dp, onClick = { onSendAid(AID_ENTER) })
+
+            // 5. CLEAR
+            KeyButton("CLEAR", Color(0xFFC92A2A), modifier = Modifier.weight(1f), innerPaddingHorizontal = 0.dp, onClick = { onSendAid(AID_CLEAR) })
+
+            // 6. PA1
+            KeyButton("PA1", Color(0xFF495057), modifier = Modifier.weight(1f), innerPaddingHorizontal = 0.dp, onClick = { onSendAid(AID_PA1) })
+
+            // 7. PA2
+            KeyButton("PA2", Color(0xFF495057), modifier = Modifier.weight(1f), innerPaddingHorizontal = 0.dp, onClick = { onSendAid(AID_PA2) })
+
+            // 8. PA3
+            KeyButton("PA3", Color(0xFF495057), modifier = Modifier.weight(1f), innerPaddingHorizontal = 0.dp, onClick = { onSendAid(AID_PA3) })
+
+            // 9. Left Navigation
+            KeyButton("←", Color(0xFF343A40), modifier = Modifier.weight(1f), innerPaddingHorizontal = 0.dp, onClick = onCursorLeft)
+
+            // 10. Up Navigation
+            KeyButton("↑", Color(0xFF343A40), modifier = Modifier.weight(1f), innerPaddingHorizontal = 0.dp, onClick = onCursorUp)
+
+            // 11. Down Navigation
+            KeyButton("↓", Color(0xFF343A40), modifier = Modifier.weight(1f), innerPaddingHorizontal = 0.dp, onClick = onCursorDown)
+
+            // 12. Right Navigation
+            KeyButton("→", Color(0xFF343A40), modifier = Modifier.weight(1f), innerPaddingHorizontal = 0.dp, onClick = onCursorRight)
+        }
+
+        Spacer(modifier = Modifier.height(1.dp).fillMaxWidth().background(Color(0xFF2C2D30)))
+
+        // Row 2: PF Keys (F1-F12 when Shift is off; F13-F24 when Shift is down) - Non-scrolling, full width
+        Row(
+            modifier = Modifier
+                .fillMaxWidth()
+                .height(35.dp)
+                .padding(horizontal = 1.dp, vertical = 1.dp),
+            verticalAlignment = Alignment.CenterVertically
+        ) {
+            val pfAids = intArrayOf(
+                AID_PF1, AID_PF2, AID_PF3, AID_PF4, AID_PF5, AID_PF6,
+                AID_PF7, AID_PF8, AID_PF9, AID_PF10, AID_PF11, AID_PF12,
+                AID_PF13, AID_PF14, AID_PF15, AID_PF16, AID_PF17, AID_PF18,
+                AID_PF19, AID_PF20, AID_PF21, AID_PF22, AID_PF23, AID_PF24
+            )
+
+            val startPf = if (isShiftPressed) 13 else 1
+            val endPf = if (isShiftPressed) 24 else 12
+
+            for (i in startPf..endPf) {
+                val aid = pfAids[i - 1]
+                KeyButton(
+                    label = "F$i",
+                    color = Color(0xFF364FC7),
+                    modifier = Modifier.weight(1f),
+                    innerPaddingHorizontal = 0.dp,
+                    onClick = {
+                        onSendAid(aid)
+                        if (isShiftPressed) {
+                            onClearShift()
+                        }
+                    }
+                )
+            }
+        }
+    }
+}
+@Composable
+private fun KeyButton(
+    label: String,
+    color: Color,
+    onClick: () -> Unit,
+    modifier: Modifier = Modifier,
+    innerPaddingHorizontal: androidx.compose.ui.unit.Dp = 0.dp
+) {
+    Surface(
+        onClick = onClick,
+        shape = RoundedCornerShape(4.dp),
+        color = color,
+        shadowElevation = 1.dp,
+        modifier = modifier
+            .padding(horizontal = 1.dp, vertical = 1.dp)
+            .height(31.dp)
+            .focusProperties { canFocus = false }
+    ) {
+        Box(
+            contentAlignment = Alignment.Center,
+            modifier = Modifier.padding(horizontal = innerPaddingHorizontal)
+        ) {
+            Text(
+                text = label,
+                color = Color.White,
+                fontSize = 10.sp,
+                fontFamily = FontFamily.Monospace,
+                fontWeight = FontWeight.Bold,
+                maxLines = 1
+            )
+        }
+    }
+}

src/main/java/org/pubvm/a3270/ui/OiaStatusBar.kt

@@ -0,0 +1,106 @@
+package org.pubvm.a3270.ui
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import org.lib3270j.ConnectionState
+
+@Composable
+fun OiaStatusBar(
+    connectionState: ConnectionState,
+    currentHost: String,
+    isKeyboardLocked: Boolean,
+    oiaText: String,
+    cursorAddr: Int,
+    rows: Int,
+    cols: Int,
+    modifier: Modifier = Modifier
+) {
+    val row = if (cols > 0) (cursorAddr / cols) + 1 else 1
+    val col = if (cols > 0) (cursorAddr % cols) + 1 else 1
+    val posStr = String.format("%02d/%02d", row, col)
+
+    val hostText = if (currentHost.isNotBlank()) currentHost else oiaText
+
+    val lockStatusText = if (!connectionState.isConnected()) {
+        "OFFLINE"
+    } else if (isKeyboardLocked) {
+        "X SYSTEM"
+    } else {
+        "READY"
+    }
+
+    val lockStatusColor = if (!connectionState.isConnected()) {
+        Color(0xFF868E96)
+    } else if (isKeyboardLocked) {
+        Color(0xFFFF6B6B) // Red for locked
+    } else {
+        Color(0xFF51CF66) // Green for ready
+    }
+
+    Row(
+        modifier = modifier
+            .fillMaxWidth()
+            .height(26.dp)
+            .background(Color(0xFF161719))
+            .padding(horizontal = 8.dp),
+        verticalAlignment = Alignment.CenterVertically,
+        horizontalArrangement = Arrangement.SpaceBetween
+    ) {
+        // Connected Host & Status Indicator
+        Row(
+            verticalAlignment = Alignment.CenterVertically,
+            modifier = Modifier.weight(1f)
+        ) {
+            Box(
+                modifier = Modifier
+                    .size(8.dp)
+                    .background(if (connectionState.isConnected()) Color(0xFF51CF66) else Color(0xFF868E96))
+            )
+            Spacer(modifier = Modifier.width(6.dp))
+            Text(
+                text = hostText,
+                color = Color.White,
+                fontSize = 11.sp,
+                fontFamily = FontFamily.Monospace,
+                fontWeight = FontWeight.Bold,
+                maxLines = 1
+            )
+        }
+
+        // Terminal Keyboard Lock Status Badge (X SYSTEM vs READY)
+        Surface(
+            color = lockStatusColor.copy(alpha = 0.2f),
+            shape = RoundedCornerShape(4.dp),
+            modifier = Modifier.padding(horizontal = 4.dp)
+        ) {
+            Text(
+                text = lockStatusText,
+                color = lockStatusColor,
+                fontSize = 10.sp,
+                fontFamily = FontFamily.Monospace,
+                fontWeight = FontWeight.Bold,
+                modifier = Modifier.padding(horizontal = 6.dp, vertical = 2.dp)
+            )
+        }
+
+        // Cursor Position
+        Text(
+            text = "R$posStr",
+            color = Color(0xFF22B8CF),
+            fontSize = 11.sp,
+            fontFamily = FontFamily.Monospace,
+            fontWeight = FontWeight.Bold
+        )
+    }
+}

src/main/java/org/pubvm/a3270/ui/TerminalView.kt

@@ -0,0 +1,433 @@
+package org.pubvm.a3270.ui
+
+import android.graphics.Paint
+import android.graphics.Typeface
+import android.widget.Toast
+import androidx.compose.foundation.Canvas
+import androidx.compose.foundation.background
+import androidx.compose.foundation.gestures.awaitFirstDown
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.material3.DropdownMenu
+import androidx.compose.material3.DropdownMenuItem
+import androidx.compose.material3.Text
+import androidx.compose.runtime.*
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.geometry.Size
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.nativeCanvas
+import androidx.compose.ui.input.pointer.pointerInput
+import androidx.compose.ui.platform.LocalClipboardManager
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.platform.LocalDensity
+import androidx.compose.ui.text.AnnotatedString
+import androidx.compose.ui.unit.DpOffset
+import androidx.compose.ui.unit.dp
+import org.lib3270j.protocol.DS3270Constants.*
+import org.lib3270j.screen.ExtendedAttribute
+import org.lib3270j.screen.ScreenBuffer
+
+// Standard 3279 Host Colors (16-color palette)
+private val HOST_COLORS = arrayOf(
+    Color(0xFF000000), // 0: Neutral Black
+    Color(0xFF5078FF), // 1: Blue
+    Color(0xFFFF3232), // 2: Red
+    Color(0xFFFF82B4), // 3: Pink
+    Color(0xFF32CD32), // 4: Green
+    Color(0xFF40E0D0), // 5: Turquoise
+    Color(0xFFFFFF50), // 6: Yellow
+    Color(0xFFFFFFFF), // 7: Neutral White
+    Color(0xFF000000), // 8: Black
+    Color(0xFF1E3CB4), // 9: Deep Blue
+    Color(0xFFFFA500), // 10: Orange
+    Color(0xFFB482FF), // 11: Purple
+    Color(0xFF90EE90), // 12: Pale Green
+    Color(0xFFAFEEEE), // 13: Pale Turquoise
+    Color(0xFFAAAAAA), // 14: Grey
+    Color(0xFFFFFFFF)  // 15: White
+)
+
+private val COLOR_BLACK = Color(0xFF0A0A0A)
+
+@Composable
+fun TerminalView(
+    screenBuffer: ScreenBuffer?,
+    rows: Int,
+    cols: Int,
+    cursorAddr: Int,
+    screenVersion: Long,
+    onTapAddress: (Int) -> Unit,
+    onPasteText: (String) -> Unit = {},
+    modifier: Modifier = Modifier
+) {
+    val context = LocalContext.current
+    val clipboardManager = LocalClipboardManager.current
+    val density = LocalDensity.current
+
+    var selectionStart by remember { mutableStateOf<Offset?>(null) }
+    var selectionEnd by remember { mutableStateOf<Offset?>(null) }
+    var showContextMenu by remember { mutableStateOf(false) }
+    var contextMenuOffset by remember { mutableStateOf(Offset.Zero) }
+
+    Box(modifier = modifier.fillMaxSize()) {
+        Canvas(
+            modifier = Modifier
+                .fillMaxSize()
+                .background(COLOR_BLACK)
+                .pointerInput(cols, rows) {
+                    awaitPointerEventScope {
+                        while (true) {
+                            val down = awaitFirstDown(requireUnconsumed = false)
+                            val startTime = System.currentTimeMillis()
+                            val startPos = down.position
+                            var currentPos = startPos
+                            var isDragStarted = false
+                            val slop = viewConfiguration.touchSlop
+
+                            while (true) {
+                                val event = awaitPointerEvent()
+                                val change = event.changes.firstOrNull { it.id == down.id } ?: break
+                                if (!change.pressed) {
+                                    break
+                                }
+                                currentPos = change.position
+                                val distance = (currentPos - startPos).getDistance()
+
+                                if (distance > slop) {
+                                    if (!isDragStarted) {
+                                        isDragStarted = true
+                                        selectionStart = startPos
+                                        showContextMenu = false
+                                    }
+                                    selectionEnd = currentPos
+                                    change.consume()
+                                }
+                            }
+
+                            val duration = System.currentTimeMillis() - startTime
+                            val totalDistance = (currentPos - startPos).getDistance()
+
+                            if (isDragStarted) {
+                                // Drag completed: Keep selection box highlighted, DO NOT open context menu
+                                showContextMenu = false
+                            } else if (duration >= 600L && totalDistance <= slop) {
+                                // Stationary Long Press (held >= 600ms without dragging)
+                                contextMenuOffset = startPos
+                                showContextMenu = true
+                            } else if (totalDistance <= slop) {
+                                // Short Tap (Move Cursor)
+                                showContextMenu = false
+                                selectionStart = null
+                                selectionEnd = null
+                                val cellWidth = size.width / cols
+                                val cellHeight = size.height / rows
+                                if (cellWidth > 0 && cellHeight > 0) {
+                                    val col = (startPos.x / cellWidth).toInt().coerceIn(0, cols - 1)
+                                    val row = (startPos.y / cellHeight).toInt().coerceIn(0, rows - 1)
+                                    var addr = row * cols + col
+
+                                    val buf = screenBuffer
+                                    if (buf != null && buf.isFormatted) {
+                                        val faVal = buf.getFieldAttributeAt(addr)
+                                        if (faIsProtected(faVal.toInt() and 0xFF) || buf.getCell(addr).isFieldAttribute) {
+                                            addr = buf.findNextUnprotected(addr)
+                                        }
+                                    }
+                                    onTapAddress(addr)
+                                }
+                            }
+                        }
+                    }
+                }
+        ) {
+            val width = size.width
+            val height = size.height
+            val cellWidth = width / cols
+            val cellHeight = height / rows
+
+            if (cellWidth <= 0 || cellHeight <= 0) return@Canvas
+
+            val paint = Paint().apply {
+                isAntiAlias = true
+                typeface = Typeface.MONOSPACE
+                textSize = cellHeight * 0.85f
+            }
+
+            val buf = screenBuffer
+            val totalCells = rows * cols
+
+            var currentFA: Byte = 0
+            var currentFieldEa: ExtendedAttribute? = null
+
+            // Calculate selected cell rectangle range if drag selection active
+            var selMinRow = -1
+            var selMaxRow = -1
+            var selMinCol = -1
+            var selMaxCol = -1
+
+            val start = selectionStart
+            val end = selectionEnd
+            if (start != null && end != null) {
+                val startCol = (start.x / cellWidth).toInt().coerceIn(0, cols - 1)
+                val startRow = (start.y / cellHeight).toInt().coerceIn(0, rows - 1)
+                val endCol = (end.x / cellWidth).toInt().coerceIn(0, cols - 1)
+                val endRow = (end.y / cellHeight).toInt().coerceIn(0, rows - 1)
+
+                selMinRow = minOf(startRow, endRow)
+                selMaxRow = maxOf(startRow, endRow)
+                selMinCol = minOf(startCol, endCol)
+                selMaxCol = maxOf(startCol, endCol)
+            }
+
+            for (r in 0 until rows) {
+                for (c in 0 until cols) {
+                    val addr = r * cols + c
+                    if (addr >= totalCells) break
+
+                    val left = c * cellWidth
+                    val top = r * cellHeight
+
+                    var charVal = ' '
+                    var fgColor: Color
+                    var bgColor = COLOR_BLACK
+                    var isBold = false
+                    var isUnderline = false
+                    var isReverse = false
+
+                    if (buf != null) {
+                        val ea = buf.getCell(addr)
+
+                        if (ea.isFieldAttribute) {
+                            currentFA = ea.fa
+                            currentFieldEa = ea
+                            continue
+                        }
+
+                        // Compute 3270 color and field intensity
+                        fgColor = getFgColorForAttribute(ea, currentFieldEa, currentFA)
+                        bgColor = getBgColorForAttribute(ea, currentFieldEa)
+
+                        // Intensity
+                        if (faIsHigh(currentFA.toInt() and 0xFF)) {
+                            isBold = true
+                        }
+
+                        // Invisible fields (passwords / hidden)
+                        if (faIsZero(currentFA.toInt() and 0xFF)) {
+                            continue
+                        }
+
+                        // Extended Graphic Rendition
+                        val gr = if (ea.gr != 0.toByte()) ea.gr else (currentFieldEa?.gr ?: 0)
+                        if (gr != 0.toByte()) {
+                            val grVal = gr.toInt() and 0xFF
+                            if ((grVal and GR_INTENSIFY) != 0) isBold = true
+                            if ((grVal and GR_UNDERLINE) != 0) isUnderline = true
+                            if ((grVal and GR_REVERSE) != 0) isReverse = true
+                        }
+
+                        if (ea.ucs4 > ' ' && ea.ucs4.code != 0xFFFF) {
+                            charVal = ea.ucs4
+                        }
+                    } else {
+                        fgColor = HOST_COLORS[HOST_COLOR_GREEN]
+                    }
+
+                    if (isReverse) {
+                        val tmp = fgColor
+                        fgColor = bgColor
+                        bgColor = tmp
+                    }
+
+                    if (bgColor != COLOR_BLACK) {
+                        drawRect(
+                            color = bgColor,
+                            topLeft = Offset(left, top),
+                            size = Size(cellWidth, cellHeight)
+                        )
+                    }
+
+                    // Highlight selected block range
+                    val isSelected = r in selMinRow..selMaxRow && c in selMinCol..selMaxCol
+                    if (isSelected) {
+                        drawRect(
+                            color = Color(0x773399FF),
+                            topLeft = Offset(left, top),
+                            size = Size(cellWidth, cellHeight)
+                        )
+                    }
+
+                    if (addr == cursorAddr && !isSelected) {
+                        drawRect(
+                            color = HOST_COLORS[HOST_COLOR_TURQUOISE].copy(alpha = 0.5f),
+                            topLeft = Offset(left, top),
+                            size = Size(cellWidth, cellHeight)
+                        )
+                    }
+
+                    if (charVal != ' ') {
+                        paint.color = fgColor.toArgb()
+                        paint.isFakeBoldText = isBold
+                        val fontMetrics = paint.fontMetrics
+                        val textY = top + (cellHeight - fontMetrics.bottom + fontMetrics.top) / 2 - fontMetrics.top
+
+                        drawContext.canvas.nativeCanvas.drawText(
+                            charVal.toString(),
+                            left + (cellWidth / 4),
+                            textY,
+                            paint
+                        )
+                    }
+
+                    if (isUnderline) {
+                        drawLine(
+                            color = fgColor,
+                            start = Offset(left, top + cellHeight - 2),
+                            end = Offset(left + cellWidth, top + cellHeight - 2),
+                            strokeWidth = 2f
+                        )
+                    }
+                }
+            }
+        }
+
+        // Context Menu Popup
+        DropdownMenu(
+            expanded = showContextMenu,
+            onDismissRequest = { showContextMenu = false },
+            offset = DpOffset(
+                x = (contextMenuOffset.x / density.density).dp,
+                y = (contextMenuOffset.y / density.density).dp
+            )
+        ) {
+            val hasSelection = selectionStart != null && selectionEnd != null
+            if (hasSelection) {
+                DropdownMenuItem(
+                    text = { Text("Copy Selection") },
+                    onClick = {
+                        showContextMenu = false
+                        copySelection(selectionStart, selectionEnd, screenBuffer, rows, cols, clipboardManager, context)
+                    }
+                )
+                DropdownMenuItem(
+                    text = { Text("Clear Selection") },
+                    onClick = {
+                        showContextMenu = false
+                        selectionStart = null
+                        selectionEnd = null
+                    }
+                )
+            } else {
+                DropdownMenuItem(
+                    text = { Text("Select All") },
+                    onClick = {
+                        showContextMenu = false
+                        selectionStart = Offset(0f, 0f)
+                        selectionEnd = Offset(100000f, 100000f)
+                    }
+                )
+            }
+
+            DropdownMenuItem(
+                text = { Text("Paste") },
+                onClick = {
+                    showContextMenu = false
+                    val clipText = clipboardManager.getText()?.text
+                    if (!clipText.isNullOrEmpty()) {
+                        onPasteText(clipText)
+                        Toast.makeText(context, "Pasted text from clipboard", Toast.LENGTH_SHORT).show()
+                    } else {
+                        Toast.makeText(context, "Clipboard is empty", Toast.LENGTH_SHORT).show()
+                    }
+                }
+            )
+        }
+    }
+}
+
+private fun copySelection(
+    start: Offset?,
+    end: Offset?,
+    screenBuffer: ScreenBuffer?,
+    rows: Int,
+    cols: Int,
+    clipboardManager: androidx.compose.ui.platform.ClipboardManager,
+    context: android.content.Context
+) {
+    if (start != null && end != null && screenBuffer != null && cols > 0 && rows > 0) {
+        val displayMetrics = context.resources.displayMetrics
+        val cellWidth = displayMetrics.widthPixels.toFloat() / cols
+        val cellHeight = displayMetrics.heightPixels.toFloat() / rows
+
+        val startCol = (start.x / cellWidth).toInt().coerceIn(0, cols - 1)
+        val startRow = (start.y / cellHeight).toInt().coerceIn(0, rows - 1)
+        val endCol = (end.x / cellWidth).toInt().coerceIn(0, cols - 1)
+        val endRow = (end.y / cellHeight).toInt().coerceIn(0, rows - 1)
+
+        val minRow = minOf(startRow, endRow)
+        val maxRow = maxOf(startRow, endRow)
+        val minCol = minOf(startCol, endCol)
+        val maxCol = maxOf(startCol, endCol)
+
+        val sb = StringBuilder()
+        for (r in minRow..maxRow) {
+            val line = StringBuilder()
+            for (c in minCol..maxCol) {
+                val addr = r * cols + c
+                if (addr < (rows * cols)) {
+                    val cell = screenBuffer.getCell(addr)
+                    if (cell != null && !cell.isFieldAttribute && cell.ucs4 > ' ' && cell.ucs4.code != 0xFFFF) {
+                        line.append(cell.ucs4)
+                    } else {
+                        line.append(' ')
+                    }
+                }
+            }
+            sb.append(line.toString().trimEnd()).append('\n')
+        }
+        val textToCopy = sb.toString().trimEnd()
+        if (textToCopy.isNotBlank()) {
+            clipboardManager.setText(AnnotatedString(textToCopy))
+            Toast.makeText(context, "Copied selected block to clipboard", Toast.LENGTH_SHORT).show()
+        }
+    }
+}
+
+private fun getFgColorForAttribute(ea: ExtendedAttribute, currentFieldEa: ExtendedAttribute?, currentFA: Byte): Color {
+    val fg = if (ea.fg != 0.toByte()) (ea.fg.toInt() and 0xFF)
+             else if (currentFieldEa != null && currentFieldEa.fg != 0.toByte()) (currentFieldEa.fg.toInt() and 0xFF)
+             else 0
+
+    if (fg in 0xf0..0xff) {
+        return HOST_COLORS[fg - 0xf0]
+    }
+    val fa = currentFA.toInt() and 0xFF
+    return if (faIsProtected(fa)) {
+        if (faIsHigh(fa)) HOST_COLORS[HOST_COLOR_WHITE] else HOST_COLORS[HOST_COLOR_BLUE]
+    } else {
+        if (faIsHigh(fa)) HOST_COLORS[HOST_COLOR_RED] else HOST_COLORS[HOST_COLOR_GREEN]
+    }
+}
+
+private fun getBgColorForAttribute(ea: ExtendedAttribute, currentFieldEa: ExtendedAttribute?): Color {
+    val bg = if (ea.bg != 0.toByte()) (ea.bg.toInt() and 0xFF)
+             else if (currentFieldEa != null && currentFieldEa.bg != 0.toByte()) (currentFieldEa.bg.toInt() and 0xFF)
+             else 0
+
+    if (bg in 0xf0..0xff) {
+        val idx = bg - 0xf0
+        if (idx == HOST_COLOR_NEUTRAL_BLACK || idx == HOST_COLOR_BLACK) {
+            return COLOR_BLACK
+        }
+        return HOST_COLORS[idx]
+    }
+    return COLOR_BLACK
+}
+
+private fun Color.toArgb(): Int {
+    return (alpha * 255).toInt() shl 24 or
+           ((red * 255).toInt() shl 16) or
+           ((green * 255).toInt() shl 8) or
+           (blue * 255).toInt()
+}