Module theme 

Theming: the Theme surface, where it comes from (ThemeSource), the per-popup MenuOptions, and the pure resolution of a semantic Color into a concrete Rgba.

A ThemeSource chooses the look: System(..) matches the host OS (and alone receives the backend’s live accent/color/font injection), MacOs/Windows/Gnome force a specific platform look on any host, Preset is a built-in skin, and Custom is fully hand-built. This pure layer resolves a source to a concrete Theme, fully unit-testable without any GUI.

Structs

MenuOptions

Tunable popup options layered on top of the Theme.

Theme

The full visual theme. Every semantic Color resolves against one of these, and spacing/radius/row-height are tunable so a consumer can fully restyle.

Enums

GutterPolicy

How the popup reserves the leading (checkmark/icon) gutter (#43).

OsFamily

A platform’s native menu look. Selected by ThemeSource and built by Theme::for_family. The host family is supplied by the platform backend (no cfg crosses the seam), so a caller can also request a foreign family — e.g. a macOS app asking for the Windows look.

Preset

A built-in non-OS theme skin, selectable via ThemeSource::Preset. These render as-authored on every platform (no live OS accent/color/font injection).

ThemeMode

Light/dark selection for a themed OS look. Auto follows the host OS appearance; Light/Dark force it.

ThemeSource

Where the theme comes from.

TrailingGutterPolicy

How the popup reserves the trailing (submenu chevron / trailing accessory) gutter (#60). Symmetric to the leading GutterPolicy.