App navigation

App Flow

The app follows this general flow:

Launch → Scanner Screen → [Connect via BLE/USB/TCP] → Contacts Screen

After connecting, the three main screens (Contacts, Channels, Map) are accessible via a persistent bottom navigation bar called the QuickSwitchBar.

Quick Switch Bar

The QuickSwitchBar is a Material 3 NavigationBar with a frosted-glass visual treatment (blur backdrop, transparent theme, rounded corners). It appears at the bottom of all three main screens.

Index	Icon	Label	Screen
0	People	Contacts	ContactsScreen
1	Tag	Channels	ChannelsScreen
2	Map	Map	MapScreen

Tapping a tab replaces the current screen with a subtle fade + slight horizontal nudge transition (220ms forward, 200ms reverse). The back button is suppressed on all three main screens — navigation between them is flat, not stacked. All icons use outline variants (people_outline, tag, map_outlined) following Material 3 conventions.

Device Screen

The Device Screen is a transitional hub that shows after connection. In practice, the app navigates directly to Contacts after connecting, but the Device Screen is reachable via the QuickSwitchBar.

What the User Sees

App Bar:

• Left: Battery indicator chip (tappable — toggles between percentage and voltage display). Icon changes based on level: battery_unknown when data unavailable, battery_alert (orange) at 15% or below, battery_full otherwise
• Left-aligned title (centerTitle: false): Two-line layout — small grey “MeshCore” label above the device name in bold
• Right: Disconnect button (bluetooth_disabled crossed-out icon) and Settings button (tune icon)

Body:

• Connection Card: Device avatar, device name, device ID, “Connected” chip, and battery chip
• Quick Switch section: The QuickSwitchBar widget for navigating to Contacts/Channels/Map

Disconnection

• The disconnect button shows a confirmation dialog before disconnecting
• If the device disconnects unexpectedly, the app automatically navigates back to the Scanner screen (fires after the current frame completes via a post-frame callback)
• This auto-navigation behavior (DisconnectNavigationMixin) is shared across all main screens

Theme and Locale

• Theme mode is user-configurable in App Settings (System / Light / Dark) — not locked to system
• Language can be overridden to one of 15 supported languages, or follow the system locale
• On web, if a non-Chromium browser is detected, the app shows a ChromeRequiredScreen instead of the Scanner (Web Bluetooth requires Chromium)

Full Navigation Graph

ScannerScreen (root, always on stack)
  ├─ [BLE connect] → push → ContactsScreen
  ├─ [TCP FAB] → push → TcpScreen
  │     └─ [TCP connected] → pushReplacement → ContactsScreen
  └─ [USB FAB] → push → UsbScreen
        └─ [USB connected] → pushReplacement → ContactsScreen

ContactsScreen (selected=0)
  ├─ [quick-switch 1] → pushReplacement → ChannelsScreen
  ├─ [quick-switch 2] → pushReplacement → MapScreen
  ├─ [tap contact] → push → ChatScreen
  ├─ [overflow > Settings] → push → SettingsScreen
  └─ [overflow > Discovered] → push → DiscoveryScreen

ChannelsScreen (selected=1)
  ├─ [quick-switch 0] → pushReplacement → ContactsScreen
  ├─ [quick-switch 2] → pushReplacement → MapScreen
  ├─ [tap channel] → push → ChannelChatScreen
  └─ [overflow > Settings] → push → SettingsScreen

MapScreen (selected=2)
  ├─ [quick-switch 0] → pushReplacement → ContactsScreen
  ├─ [quick-switch 1] → pushReplacement → ChannelsScreen
  ├─ [radar button] → push → PathTraceMapScreen
  ├─ [terrain button] → push → LineOfSightMapScreen
  └─ [long-press] → share marker / set location

Settings (push from any main screen)
  └─ [App Settings] → push → AppSettingsScreen
        └─ [Offline Map Cache] → push → MapCacheScreen

Any disconnection from any screen triggers popUntil(route.isFirst), returning to the Scanner.