disable file manager if no root, tap to request for root

app/src/main/java/sh/sar/isodroid/ui/screens/MainScreen.kt

@@ -27,6 +27,7 @@ import androidx.compose.material3.Scaffold
 import androidx.compose.material3.SnackbarHost
 import androidx.compose.material3.SnackbarHostState
 import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
 import androidx.compose.material3.TopAppBar
 import androidx.compose.material3.TopAppBarDefaults
 import androidx.compose.runtime.Composable
@@ -183,6 +184,31 @@ fun MainScreen(
                     canNavigateUp = viewModel.canNavigateUp(),
                     modifier = Modifier.weight(1f)
                 )
+            } else if (uiState.hasRoot != true) {
+                Box(
+                    modifier = Modifier.fillMaxSize(),
+                    contentAlignment = Alignment.Center
+                ) {
+                    Column(
+                        horizontalAlignment = Alignment.CenterHorizontally
+                    ) {
+                        Text(
+                            text = "Root Access Required",
+                            style = MaterialTheme.typography.titleLarge,
+                            color = MaterialTheme.colorScheme.onSurface
+                        )
+                        Spacer(modifier = Modifier.height(8.dp))
+                        Text(
+                            text = "Grant root access to use ISO Droid",
+                            style = MaterialTheme.typography.bodyMedium,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant
+                        )
+                        Spacer(modifier = Modifier.height(16.dp))
+                        TextButton(onClick = { viewModel.requestRootAccess() }) {
+                            Text("Grant Root Access")
+                        }
+                    }
+                }
             }
         }
     }

app/src/main/java/sh/sar/isodroid/ui/screens/SettingsScreen.kt

@@ -172,11 +172,20 @@ fun SettingsScreen(
             // Storage section
             SectionHeader(title = "Storage")
 
+            val hasRootForStorage = uiState.hasRoot ?: false
             SettingsItem(
                 icon = Icons.Default.Folder,
                 title = "ISO Directory",
                 subtitle = uiState.isoDirectory,
-                onClick = { showPathDialog = true }
+                enabled = hasRootForStorage,
+                disabledHint = "Tap to grant root access",
+                onClick = {
+                    if (hasRootForStorage) {
+                        showPathDialog = true
+                    } else {
+                        viewModel.requestRootAccess()
+                    }
+                }
             )
 
             HorizontalDivider(modifier = Modifier.padding(horizontal = 16.dp))
@@ -814,8 +823,12 @@ private fun SettingsItem(
     icon: ImageVector,
     title: String,
     subtitle: String,
+    enabled: Boolean = true,
+    disabledHint: String? = null,
     onClick: () -> Unit
 ) {
+    val contentAlpha = if (enabled) 1f else 0.38f
+
     Row(
         modifier = Modifier
             .fillMaxWidth()
@@ -826,19 +839,28 @@ private fun SettingsItem(
         Icon(
             imageVector = icon,
             contentDescription = null,
-            tint = MaterialTheme.colorScheme.onSurfaceVariant
+            tint = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = contentAlpha)
         )
         Spacer(modifier = Modifier.width(16.dp))
         Column(modifier = Modifier.weight(1f)) {
             Text(
                 text = title,
-                style = MaterialTheme.typography.bodyLarge
+                style = MaterialTheme.typography.bodyLarge,
+                color = MaterialTheme.colorScheme.onSurface.copy(alpha = contentAlpha)
             )
             Text(
                 text = subtitle,
                 style = MaterialTheme.typography.bodySmall,
-                color = MaterialTheme.colorScheme.onSurfaceVariant
+                color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = contentAlpha)
             )
+            if (!enabled && disabledHint != null) {
+                Spacer(modifier = Modifier.height(4.dp))
+                Text(
+                    text = disabledHint,
+                    style = MaterialTheme.typography.bodySmall,
+                    color = MaterialTheme.colorScheme.error.copy(alpha = 0.7f)
+                )
+            }
         }
     }
 }