# Host APP Rebuild

## Goal

Keep the APP layer suitable for teaching from simple to complex.

Teaching order:

1. one button
2. one keyboard page
3. two pages
4. one main window
5. one shared theme

## Completed Nodes

### Node 1: theme helpers

Files:

- `KeyBorad/KeyBorad/APP/AppTheme.h`
- `KeyBorad/KeyBorad/APP/AppTheme.cpp`

Design notes:

- centralize colors and style strings
- keep styling readable
- avoid mixing style text inside every widget

### Node 2: key button

Files:

- `KeyBorad/KeyBorad/APP/AppKeyButton.h`
- `KeyBorad/KeyBorad/APP/AppKeyButton.cpp`

Design notes:

- teach one custom button first
- keep state changes explicit
- let one widget own its own text and style refresh

### Node 3: keyboard page

Files:

- `KeyBorad/KeyBorad/APP/AppKeyboardPage.h`
- `KeyBorad/KeyBorad/APP/AppKeyboardPage.cpp`

Design notes:

- grow from one button to a full keypad
- keep layout data local and explicit

### Node 4: settings page

Files:

- `KeyBorad/KeyBorad/APP/AppSettingsPage.h`
- `KeyBorad/KeyBorad/APP/AppSettingsPage.cpp`

Design notes:

- use a second page early
- give transport status and action feedback one simple home

### Node 5: main window integration

Files updated in this step:

- `KeyBorad/KeyBorad/APP/AppMainWindow.h`
- `KeyBorad/KeyBorad/APP/AppMainWindow.cpp`
- `KeyBorad/KeyBorad/main.cpp`

Implemented behavior:

- create the two-page window
- own one `Lgc_Core`
- start handshake on launch
- poll the logic layer with a timer
- refresh settings page texts from logic state