Module shake 

Shake — wraps a child and plays a damped horizontal oscillation whenever an external trigger Signal<u32> is bumped. The classic invalid-input feedback: wrong password, failed form validation, “no more results” wall.

let shake_trigger = ctx.signal(0_u32);
ctx.add(
    Shake::new(shake_trigger.clone())
        .child(text_input_field),
);
// ...elsewhere, on validation failure:
shake_trigger.set(shake_trigger.get() + 1);

Layout semantics

Layout-stable: the wrapper reports the child’s full natural size and clips the oscillating-out-of-bounds excursions on each side. Siblings don’t reflow. The shake is a pure visual offset.

Reduced motion

Honours prefers-reduced-motion: the trigger no-ops. The widget is still focusable / interactive — the visual feedback just doesn’t play. Pair with another a11y-friendly cue (red border, error text) when error state must be communicated.

Structs

Shake

Wraps a child and plays a damped horizontal-oscillation shake each time the trigger signal value changes.