Crate day_piece_activity 

day-piece-activity — an EXTERNAL Day Piece (DESIGN.md §15) wrapping each toolkit’s NATIVE indeterminate activity/loading spinner: NSProgressIndicator (Spinning style) on AppKit, UIActivityIndicatorView on UIKit, GtkSpinner on GTK, a busy QProgressBar (range 0..0) on Qt, android.widget.ProgressBar on Android, and ProgressRing on XAML. One Rust API registered link-time into each backend’s renderer slice without touching day, carrying both a front-end AND its own native backends (including an Android Java shim), see docs/extending.md.

Unlike a media player, a spinner has an intrinsic size — the piece is a natural-size leaf (no fill_measure; each backend’s default measure returns the native indicator’s fitting size), so it does not need a .frame(w, h) to be visible (though one gives it a stable region). .animating(_) accepts a bool, a Signal<bool>, or a closure (default true): a reactive source starts/stops the animation through an ActivityPatch::Animating write. .large(true) selects the platform’s large control size.

Structs

Activity

A native activity/loading spinner. Bind its running state with .animating(_) and pick the large control size with .large(true).

ActivityProps

Full props (realize). Both are set at build; only animating patches thereafter.

Enums

ActivityPatch

The one sparse update the spinner takes after creation.

Constants

KIND

Functions

activity

activity() — a native indeterminate spinner, animating by default. Configure with .animating(_) (a bool, Signal<bool>, or closure) and .large(bool).