Menus

Two APIs coexist. Menus must be created before the first Window (enforced at runtime via MenuOrderException).

Declarative / Fluent Style

Menu::create('File')
    ->item('Open', fn (MenuItem $item) => /* ... */)
    ->separator()
    ->quitItem();

Menu::create('Edit')
    ->checkItem('Dark Mode', fn (MenuItem $item) => /* ... */);

Imperative Style

$help = new Menu('Help');
$about = $help->appendAboutItem();
$about->onClick(fn (MenuItem $item) => /* ... */);

Note

The patched MenuItem::onClick() replaces the handler on each call — it does NOT stack like most libui callbacks.