Halogen.Widgets.HAccordion

component :: forall m. MonadAff m => Component Query Input Output m

type Slot = Slot Query Output

data Query a

Imperative escape hatch. Rarely needed — Input is the main channel — but present so every widget's Slot has the same shape. SetOpen requests a value just as a click would.

Constructors

• SetOpen Boolean a

data Output

A request, not a fact: the user asked for this new open value.

Constructors

• Toggled Boolean

type Input = { debounce :: Milliseconds, disabled :: Boolean, label :: String, motion :: Motion, open :: Boolean, sub :: Maybe String }

Controlled input. The parent owns open; everything else is config.

defaultInput :: String -> Input

A sensible starting Input; override the fields you care about. The 120 ms default coalesces a double-dispatched click into one Toggled. motion defaults to NoMotion — the header snaps, as it always has; opt into eased chevron rotation by overriding it (and pair with Accordion.body for an eased body reveal).

body :: forall w i. { motion :: Motion, open :: Boolean } -> Array (HTML w i) -> HTML w i

Tier-2 chrome (CONTRACT.md rule 5): an OPTIONAL animated wrapper for the panel body the parent renders. The accordion component is only the header; the body has always been the parent's, written if open then [body] else []. That form unmounts the body when collapsed, which is exactly why it cannot animate. body keeps the content mounted and eases its height with the CSS grid-rows 0fr↔1fr trick, so it slides.

The trade-off, made explicit: the body stays in the DOM while collapsed (at height 0). For a presentational body that costs nothing; for a body of live, expensive children, weigh it — the plain if open then … unmount is still the right call when you want the collapsed body genuinely gone, and is lighter when you are not animating at all. Reach for body when you want the reveal eased (pass the same motion you gave the header).

It is action-polymorphic, like Panel/Modal: your body content threads straight through, so it carries your interactive children untouched.