Function: GeoVisLayerControl()

GeoVisLayerControl(__namedParameters?): Element | null

Defined in: ui/GeoVisLayerControl.tsx:142

Floating panel of layer-visibility toggles, driven entirely by spec.control and auto-mounted by <GeoVisProvider> — consumers never place it manually.

It renders a collapsed trigger button anchored to a map corner; expanding it (on hover or click, per control.trigger) reveals one button per control.items entry. Clicking an item flips the visibility of its referenced layers via dispatch({ type: 'toggle-layer' }).

Each item has three visual states: active (its layers are shown), inactive (its layers are hidden), and disabled (none of its layers exist in the current spec — the button is greyed and non-interactive). The on/off choice is remembered by item.id and re-applied whenever the spec changes, so hiding a layer persists across spec rebuilds (e.g. map-mode switches) as long as the control remains present.

With control.maxVisibleItems set and more items than that, the panel shows only the first ones plus a "Ver mais" card; clicking it swaps in a larger panel with every item, which stays open until closed (its close button, Escape, a click outside, or the trigger) — even for the 'hover' trigger.

Renders null when spec.control is absent.

Parameters

Parameter	Type	Description
__namedParameters	{ expanded?: boolean; onExpandedChange?: (expanded) => void; trailing?: ReactNode; }	-
__namedParameters.expanded?	boolean	Whether the panel is open. Omit to let the control own that state — the default. Pass it (with onExpandedChange) to coordinate the panel with a sibling overlay: below the compact breakpoint <GeoVisProvider> does exactly that, so opening the legend closes this panel and vice versa, since both claim the space above the trigger row.
__namedParameters.onExpandedChange?	(expanded) => void	Called with the requested open state. Required for expanded to take effect.
__namedParameters.trailing?	ReactNode	Extra control rendered beside the trigger, inside the same anchored row. Used below the compact breakpoint to sit the legend button next to this one; the two then share a single corner anchor instead of each computing its own offset and colliding when this control's panel opens sideways.

Returns

Element | null