added keyguard to qr code encrypted key export

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

@@ -342,6 +342,54 @@ private fun QrCodeButton(accountViewModel: AccountViewModel) {
     }
 }
 
+@Composable
+private fun QrCodeButtonEncrypted(
+    accountViewModel: AccountViewModel,
+    password: MutableState<TextFieldValue>,
+) {
+    val context = LocalContext.current
+
+    // store the dialog open or close state
+    var dialogOpen by remember { mutableStateOf(false) }
+
+    val keyguardLauncher =
+        rememberLauncherForActivityResult(ActivityResultContracts.StartActivityForResult()) { result: ActivityResult ->
+            if (result.resultCode == Activity.RESULT_OK) {
+                dialogOpen = true
+            }
+        }
+
+    IconButton(
+        enabled = password.value.text.isNotBlank(),
+        onClick = {
+            authenticate(
+                title = stringRes(context, R.string.copy_my_secret_key),
+                context = context,
+                keyguardLauncher = keyguardLauncher,
+                onApproved = { dialogOpen = true },
+                onError = { title, message -> accountViewModel.toast(title, message) },
+            )
+        },
+    ) {
+        Icon(
+            painter = painterResource(R.drawable.ic_qrcode),
+            contentDescription = stringRes(id = R.string.show_npub_as_a_qr_code),
+            modifier = Modifier.size(24.dp),
+        )
+    }
+
+    if (dialogOpen) {
+        val key =
+            accountViewModel.account.settings.keyPair.privKey
+                ?.toHexKey()
+                ?.let { CryptoUtils.encryptNIP49(it, password.value.text) }
+        ShowKeyQRDialog(
+            key,
+            onClose = { dialogOpen = false },
+        )
+    }
+}
+
 @Composable
 private fun NSecCopyButton(accountViewModel: AccountViewModel) {
     val clipboardManager = LocalClipboardManager.current
@@ -403,6 +451,8 @@ private fun EncryptNSecCopyButton(
             }
         }
 
+    Row {
+        Column {
             OutlinedButton(
                 modifier = Modifier.padding(horizontal = 3.dp),
                 onClick = {
@@ -430,6 +480,12 @@ private fun EncryptNSecCopyButton(
             }
         }
 
+        Column {
+            QrCodeButtonEncrypted(accountViewModel, password)
+        }
+    }
+}
+
 fun Context.getFragmentActivity(): FragmentActivity? {
     var currentContext = this
     while (currentContext is ContextWrapper) {