@modoki/engine / index / UIAction

Variable: UIAction

const UIAction: Trait<() => object>

UIAction — event handlers for interactive UI elements.

A single flat list of bindings. Each binding fires on one event (click / change / submit) and either writes a property declaratively (kind:'set') or dispatches a named action (kind:'call'). This unifies what used to be six separate fields (onClick/onClickPayload/onClickTarget/onClickSet/onChange/ onSubmit) into one honest model — see runtime/ui/bindings.ts.

• A button that opens Credits and closes Settings = two set bindings on click.
• A slider that drives a system = one call binding on change.
• A slider that writes a field directly = one set binding on change with value:'$value' (the live slider number), no game code.

koota note: this is an AoS trait (callback form) because bindings is an array — koota forbids array fields in the plain object (SoA) form. The callback runs per entity, so each element gets its OWN fresh bindings array (no shared default). applyBindings only reads it and the editor replaces it immutably, so never mutate the live array in place. .schema is undefined for AoS traits; serialize/prefab snapshot fall back to the registered field list.