8 lines
3.2 KiB
Plaintext
8 lines
3.2 KiB
Plaintext
{
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"version": 3,
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"sources": ["../src/focus-guards.tsx"],
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"sourcesContent": ["import * as React from 'react';\n\n/** Number of components which have requested interest to have focus guards */\nlet count = 0;\n\n/**\n * Cached references to the single shared pair of edge guards. Keeping these at\n * module scope lets us avoid scanning the whole document (`querySelectorAll`)\n * and re-inserting the guards on every overlay mount.\n */\nlet guards: { start: HTMLSpanElement; end: HTMLSpanElement } | null = null;\n\ninterface FocusGuardsProps {\n children?: React.ReactNode;\n}\n\nfunction FocusGuards(props: FocusGuardsProps) {\n useFocusGuards();\n return props.children;\n}\n\n/**\n * Injects a pair of focus guards at the edges of the whole DOM tree\n * to ensure `focusin` & `focusout` events can be caught consistently.\n */\nfunction useFocusGuards() {\n React.useEffect(() => {\n if (!guards) {\n guards = { start: createFocusGuard(), end: createFocusGuard() };\n }\n const { start, end } = guards;\n\n // Only mutate the DOM when the edge invariant is actually broken. Writing\n // to `document.body` dirties layout and forces a synchronous reflow once\n // sibling effects read layout (Popper measuring, react-remove-scroll,\n // aria-hidden, FocusScope), so skipping no-op moves avoids that cost on\n // every mount. The trailing guard still gets re-asserted to last whenever a\n // newly portaled node lands after it (portals append to the end of\n // `document.body`). See https://github.com/radix-ui/primitives/issues/2812\n if (document.body.firstElementChild !== start) {\n document.body.insertAdjacentElement('afterbegin', start);\n }\n if (document.body.lastElementChild !== end) {\n document.body.insertAdjacentElement('beforeend', end);\n }\n count++;\n\n return () => {\n if (count === 1) {\n guards?.start.remove();\n guards?.end.remove();\n guards = null;\n }\n count = Math.max(0, count - 1);\n };\n }, []);\n}\n\nfunction createFocusGuard() {\n const element = document.createElement('span');\n element.setAttribute('data-radix-focus-guard', '');\n element.tabIndex = 0;\n element.style.outline = 'none';\n element.style.opacity = '0';\n element.style.position = 'fixed';\n element.style.pointerEvents = 'none';\n return element;\n}\n\nexport {\n FocusGuards,\n //\n FocusGuards as Root,\n //\n useFocusGuards,\n};\n"],
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"names": []
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}
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