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The\n * panel lives on `body`, outside the contenteditable, so opening it never\n * moves the caret and the editor's clipping never crops it.\n */\n\nimport { useEffect, useId, useLayoutEffect, useRef, useState } from \"react\";\nimport { createPortal } from \"react-dom\";\nimport { CheckIcon, ChevronIcon } from \"@chopin/icons\";\n\nimport { usePopoverDismissal } from \"../popover-dismissal\";\nimport { jumpTo } from \"./code\";\nimport { useTransitionPresence } from \"../transition-presence\";\n\nimport type { CSSProperties, KeyboardEvent } from \"react\";\nimport type { LanguageOption } from \"./code\";\n\nconst GAP = 4;\nconst MARGIN = 8;\nconst MAX_HEIGHT = 288;\n\nexport function LanguageMenu(\n\t{ disabled, onChange, options, value }: {\n\t\tdisabled?: boolean;\n\t\tonChange: (value: string) => void;\n\t\toptions: readonly LanguageOption[];\n\t\tvalue: string;\n\t},\n) {\n\tlet [open, setOpen] = useState(false);\n\t// By id, not index: a collaborator can add or remove the unlisted-language row.\n\tlet [activeId, setActiveId] = useState(value);\n\tlet [position, setPosition] = useState({ visibility: \"hidden\" });\n\tlet trigger = useRef(null);\n\tlet panel = useRef(null);\n\tlet listId = useId();\n\tlet presence = useTransitionPresence(open ? true : undefined, 150, false);\n\tlet selected = Math.max(0, options.findIndex(([id]) => id === value));\n\tlet found = options.findIndex(([id]) => id === activeId);\n\tlet active = found < 0 ? selected : found;\n\tlet setActive = (next: number | ((index: number) => number)) => {\n\t\tlet index = typeof next === \"function\" ? next(active) : next;\n\t\tlet option = options[index];\n\t\tif (option) setActiveId(option[0]);\n\t};\n\tlet label = options[selected]?.[1] ?? value;\n\n\tuseLayoutEffect(() => {\n\t\tif (!open) return;\n\t\tlet place = (event?: Event) => {\n\t\t\t// The menu's own scrolling must not reposition it.\n\t\t\tif (event?.target instanceof Node && panel.current?.contains(event.target)) return;\n\t\t\tlet rect = trigger.current?.getBoundingClientRect();\n\t\t\tif (!rect) return;\n\t\t\tlet below = window.innerHeight - rect.bottom - GAP - MARGIN;\n\t\t\tlet above = rect.top - GAP - MARGIN;\n\t\t\tlet height = Math.min(MAX_HEIGHT, Math.max(below, above));\n\t\t\tlet flip = below < Math.min(MAX_HEIGHT, panel.current?.scrollHeight ?? MAX_HEIGHT)\n\t\t\t\t&& above > below;\n\t\t\tsetPosition({\n\t\t\t\tleft: Math.max(MARGIN, rect.left),\n\t\t\t\tmaxHeight: height,\n\t\t\t\ttop: flip ? undefined : rect.bottom + GAP,\n\t\t\t\tbottom: flip ? window.innerHeight - rect.top + GAP : undefined,\n\t\t\t\ttransformOrigin: flip ? \"bottom left\" : \"top left\",\n\t\t\t\tvisibility: \"visible\",\n\t\t\t});\n\t\t};\n\t\tplace();\n\t\twindow.addEventListener(\"resize\", place);\n\t\twindow.addEventListener(\"scroll\", place, true);\n\t\treturn () => {\n\t\t\twindow.removeEventListener(\"resize\", place);\n\t\t\twindow.removeEventListener(\"scroll\", place, true);\n\t\t};\n\t}, [open]);\n\n\tuseLayoutEffect(() => {\n\t\tif (open && position.visibility === \"visible\") panel.current?.focus({ preventScroll: true });\n\t}, [open, position.visibility]);\n\n\t// Keep the highlighted option in view as the keyboard moves through a long list.\n\tuseEffect(() => {\n\t\tif (!open) return;\n\t\tpanel.current?.querySelector(`[data-index=\"${active}\"]`)\n\t\t\t?.scrollIntoView({ block: \"nearest\" });\n\t}, [open, active]);\n\n\tusePopoverDismissal(\n\t\topen,\n\t\ttarget => panel.current?.contains(target) || trigger.current?.contains(target),\n\t\trestoreFocus => {\n\t\t\tsetOpen(false);\n\t\t\tif (restoreFocus) trigger.current?.focus();\n\t\t},\n\t);\n\n\tlet show = () => {\n\t\tsetActiveId(value);\n\t\tsetOpen(true);\n\t};\n\n\tlet close = () => {\n\t\tsetOpen(false);\n\t\ttrigger.current?.focus();\n\t};\n\n\tlet choose = (index: number) => {\n\t\tlet option = options[index];\n\t\tif (option && option[0] !== value) onChange(option[0]);\n\t\tclose();\n\t};\n\n\tlet onKey = (event: KeyboardEvent) => {\n\t\tlet last = options.length - 1;\n\t\tlet step: Record void> = {\n\t\t\tArrowDown: () => setActive(index => Math.min(last, index + 1)),\n\t\t\tArrowUp: () => setActive(index => Math.max(0, index - 1)),\n\t\t\tHome: () => setActive(0),\n\t\t\tEnd: () => 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