Module kinds 

The built-in piece keys as plain strings, for the registry and the PieceKind seam.

Constants

BUTTON

CANVAS

CONTAINER

A dumb native panel (the column/row/stack backing).

COVER

A fullscreen cover (docs/cover.md): a modal surface presented over the whole window, edge-to-edge, driven by CoverPatch::{Present,Dismiss}. The handle is the cover’s CONTENT container; its frame is native-owned while presented (the backend sizes it to the safe area and reports it via Event::FrameChanged).

DIVIDER

IMAGE

LABEL

LIST

Native recycling list (docs/list.md): NSTableView / UITableView / RecyclerView / GtkListView / QListView. Owns scrolling + cell reuse; Day binds row content on demand.

LIST_CELL

A recycled row’s content anchor inside a LIST; Day adopts the native cell as its handle. ADOPTED, never realized — Toolkit::adopt wraps the native cell, so backends’ realize never sees this kind.

NAV

Navigation host (docs/navigation.md): stack on mobile, split panes on desktop.

NAV_MENU

Native navigation item list (docs/navigation.md): NSOutlineView source list / GtkListBox navigation-sidebar / QListWidget / UITableView rows with chevrons.

NAV_PAGE

One destination’s native container inside a NAV host.

PICKER

A native option picker with menu/segmented/inline stylings (docs/picker.md). Built-in since 2026-07 (previously the satellite day-piece-picker).

PROGRESS

Progress indicator: determinate bar (fraction) or indeterminate spinner.

SCROLL

SLIDER

TABS

Native tabbed container (docs/tabs.md): NSTabView / GtkNotebook / QTabWidget / UITabBarController / Android tab strip. Holds TABS_PAGE children, one visible.

TABS_PAGE

One tab’s content container inside a TABS host; its frame is native-owned.

TEXT_AREA

A native multi-line text editor (docs/textarea.md). Built-in since 2026-07 (previously the satellite day-piece-textarea).

TEXT_FIELD

TOGGLE