8 lines
19 KiB
Plaintext
8 lines
19 KiB
Plaintext
{
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"version": 3,
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"sources": ["../src/FocusScope.tsx"],
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"sourcesContent": ["import * as React from 'react';\nimport { useComposedRefs } from '@radix-ui/react-compose-refs';\nimport { Primitive } from '@radix-ui/react-primitive';\nimport { useCallbackRef } from '@radix-ui/react-use-callback-ref';\n\nconst AUTOFOCUS_ON_MOUNT = 'focusScope.autoFocusOnMount';\nconst AUTOFOCUS_ON_UNMOUNT = 'focusScope.autoFocusOnUnmount';\nconst EVENT_OPTIONS = { bubbles: false, cancelable: true };\n\ntype FocusableTarget = HTMLElement | { focus(): void };\n\n/* -------------------------------------------------------------------------------------------------\n * FocusScope\n * -----------------------------------------------------------------------------------------------*/\n\nconst FOCUS_SCOPE_NAME = 'FocusScope';\n\ntype FocusScopeElement = React.ElementRef<typeof Primitive.div>;\ntype PrimitiveDivProps = React.ComponentPropsWithoutRef<typeof Primitive.div>;\ninterface FocusScopeProps extends PrimitiveDivProps {\n /**\n * When `true`, tabbing from last item will focus first tabbable\n * and shift+tab from first item will focus last tababble.\n * @defaultValue false\n */\n loop?: boolean;\n\n /**\n * When `true`, focus cannot escape the focus scope via keyboard,\n * pointer, or a programmatic focus.\n * @defaultValue false\n */\n trapped?: boolean;\n\n /**\n * Event handler called when auto-focusing on mount.\n * Can be prevented.\n */\n onMountAutoFocus?: (event: Event) => void;\n\n /**\n * Event handler called when auto-focusing on unmount.\n * Can be prevented.\n */\n onUnmountAutoFocus?: (event: Event) => void;\n}\n\nconst FocusScope = React.forwardRef<FocusScopeElement, FocusScopeProps>((props, forwardedRef) => {\n const {\n loop = false,\n trapped = false,\n onMountAutoFocus: onMountAutoFocusProp,\n onUnmountAutoFocus: onUnmountAutoFocusProp,\n ...scopeProps\n } = props;\n const [container, setContainer] = React.useState<HTMLElement | null>(null);\n const onMountAutoFocus = useCallbackRef(onMountAutoFocusProp);\n const onUnmountAutoFocus = useCallbackRef(onUnmountAutoFocusProp);\n const lastFocusedElementRef = React.useRef<HTMLElement | null>(null);\n const composedRefs = useComposedRefs(forwardedRef, (node) => setContainer(node));\n\n const focusScope = React.useRef({\n paused: false,\n pause() {\n this.paused = true;\n },\n resume() {\n this.paused = false;\n },\n }).current;\n\n // Takes care of trapping focus if focus is moved outside programmatically for example\n React.useEffect(() => {\n if (trapped) {\n function handleFocusIn(event: FocusEvent) {\n if (focusScope.paused || !container) return;\n const target = event.target as HTMLElement | null;\n if (container.contains(target)) {\n lastFocusedElementRef.current = target;\n } else {\n focus(lastFocusedElementRef.current, { select: true });\n }\n }\n\n function handleFocusOut(event: FocusEvent) {\n if (focusScope.paused || !container) return;\n const relatedTarget = event.relatedTarget as HTMLElement | null;\n\n // A `focusout` event with a `null` `relatedTarget` will happen in at least two cases:\n //\n // 1. When the user switches app/tabs/windows/the browser itself loses focus.\n // 2. In Google Chrome, when the focused element is removed from the DOM.\n //\n // We let the browser do its thing here because:\n //\n // 1. The browser already keeps a memory of what's focused for when the page gets refocused.\n // 2. In Google Chrome, if we try to focus the deleted focused element (as per below), it\n // throws the CPU to 100%, so we avoid doing anything for this reason here too.\n if (relatedTarget === null) return;\n\n // If the focus has moved to an actual legitimate element (`relatedTarget !== null`)\n // that is outside the container, we move focus to the last valid focused element inside.\n if (!container.contains(relatedTarget)) {\n focus(lastFocusedElementRef.current, { select: true });\n }\n }\n\n // When the focused element gets removed from the DOM, browsers move focus\n // back to the document.body. In this case, we move focus to the container\n // to keep focus trapped correctly.\n function handleMutations(mutations: MutationRecord[]) {\n const focusedElement = document.activeElement as HTMLElement | null;\n if (focusedElement !== document.body) return;\n for (const mutation of mutations) {\n if (mutation.removedNodes.length > 0) focus(container);\n }\n }\n\n document.addEventListener('focusin', handleFocusIn);\n document.addEventListener('focusout', handleFocusOut);\n const mutationObserver = new MutationObserver(handleMutations);\n if (container) mutationObserver.observe(container, { childList: true, subtree: true });\n\n return () => {\n document.removeEventListener('focusin', handleFocusIn);\n document.removeEventListener('focusout', handleFocusOut);\n mutationObserver.disconnect();\n };\n }\n }, [trapped, container, focusScope.paused]);\n\n React.useEffect(() => {\n if (container) {\n focusScopesStack.add(focusScope);\n const previouslyFocusedElement = document.activeElement as HTMLElement | null;\n const hasFocusedCandidate = container.contains(previouslyFocusedElement);\n\n if (!hasFocusedCandidate) {\n const mountEvent = new CustomEvent(AUTOFOCUS_ON_MOUNT, EVENT_OPTIONS);\n container.addEventListener(AUTOFOCUS_ON_MOUNT, onMountAutoFocus);\n container.dispatchEvent(mountEvent);\n if (!mountEvent.defaultPrevented) {\n focusFirst(removeLinks(getTabbableCandidates(container)), { select: true });\n if (document.activeElement === previouslyFocusedElement) {\n focus(container);\n }\n }\n }\n\n return () => {\n container.removeEventListener(AUTOFOCUS_ON_MOUNT, onMountAutoFocus);\n\n // We hit a react bug (fixed in v17) with focusing in unmount.\n // We need to delay the focus a little to get around it for now.\n // See: https://github.com/facebook/react/issues/17894\n setTimeout(() => {\n const unmountEvent = new CustomEvent(AUTOFOCUS_ON_UNMOUNT, EVENT_OPTIONS);\n container.addEventListener(AUTOFOCUS_ON_UNMOUNT, onUnmountAutoFocus);\n container.dispatchEvent(unmountEvent);\n if (!unmountEvent.defaultPrevented) {\n focus(previouslyFocusedElement ?? document.body, { select: true });\n }\n // we need to remove the listener after we `dispatchEvent`\n container.removeEventListener(AUTOFOCUS_ON_UNMOUNT, onUnmountAutoFocus);\n\n focusScopesStack.remove(focusScope);\n }, 0);\n };\n }\n }, [container, onMountAutoFocus, onUnmountAutoFocus, focusScope]);\n\n // Takes care of looping focus (when tabbing whilst at the edges)\n const handleKeyDown = React.useCallback(\n (event: React.KeyboardEvent) => {\n if (!loop && !trapped) return;\n if (focusScope.paused) return;\n\n const isTabKey = event.key === 'Tab' && !event.altKey && !event.ctrlKey && !event.metaKey;\n const focusedElement = document.activeElement as HTMLElement | null;\n\n if (isTabKey && focusedElement) {\n const container = event.currentTarget as HTMLElement;\n const [first, last] = getTabbableEdges(container);\n const hasTabbableElementsInside = first && last;\n\n // we can only wrap focus if we have tabbable edges\n if (!hasTabbableElementsInside) {\n if (focusedElement === container) event.preventDefault();\n } else {\n if (!event.shiftKey && focusedElement === last) {\n event.preventDefault();\n if (loop) focus(first, { select: true });\n } else if (event.shiftKey && focusedElement === first) {\n event.preventDefault();\n if (loop) focus(last, { select: true });\n }\n }\n }\n },\n [loop, trapped, focusScope.paused]\n );\n\n return (\n <Primitive.div tabIndex={-1} {...scopeProps} ref={composedRefs} onKeyDown={handleKeyDown} />\n );\n});\n\nFocusScope.displayName = FOCUS_SCOPE_NAME;\n\n/* -------------------------------------------------------------------------------------------------\n * Utils\n * -----------------------------------------------------------------------------------------------*/\n\n/**\n * Attempts focusing the first element in a list of candidates.\n * Stops when focus has actually moved.\n */\nfunction focusFirst(candidates: HTMLElement[], { select = false } = {}) {\n const previouslyFocusedElement = document.activeElement;\n for (const candidate of candidates) {\n focus(candidate, { select });\n if (document.activeElement !== previouslyFocusedElement) return;\n }\n}\n\n/**\n * Returns the first and last tabbable elements inside a container.\n */\nfunction getTabbableEdges(container: HTMLElement) {\n const candidates = getTabbableCandidates(container);\n const first = findVisible(candidates, container);\n const last = findVisible(candidates.reverse(), container);\n return [first, last] as const;\n}\n\n/**\n * Returns a list of potential tabbable candidates.\n *\n * NOTE: This is only a close approximation. For example it doesn't take into account cases like when\n * elements are not visible. This cannot be worked out easily by just reading a property, but rather\n * necessitate runtime knowledge (computed styles, etc). We deal with these cases separately.\n *\n * See: https://developer.mozilla.org/en-US/docs/Web/API/TreeWalker\n * Credit: https://github.com/discord/focus-layers/blob/master/src/util/wrapFocus.tsx#L1\n */\nfunction getTabbableCandidates(container: HTMLElement) {\n const nodes: HTMLElement[] = [];\n const walker = document.createTreeWalker(container, NodeFilter.SHOW_ELEMENT, {\n acceptNode: (node: any) => {\n const isHiddenInput = node.tagName === 'INPUT' && node.type === 'hidden';\n if (node.disabled || node.hidden || isHiddenInput) return NodeFilter.FILTER_SKIP;\n // `.tabIndex` is not the same as the `tabindex` attribute. It works on the\n // runtime's understanding of tabbability, so this automatically accounts\n // for any kind of element that could be tabbed to.\n return node.tabIndex >= 0 ? NodeFilter.FILTER_ACCEPT : NodeFilter.FILTER_SKIP;\n },\n });\n while (walker.nextNode()) nodes.push(walker.currentNode as HTMLElement);\n // we do not take into account the order of nodes with positive `tabIndex` as it\n // hinders accessibility to have tab order different from visual order.\n return nodes;\n}\n\n/**\n * Returns the first visible element in a list.\n * NOTE: Only checks visibility up to the `container`.\n */\nfunction findVisible(elements: HTMLElement[], container: HTMLElement) {\n for (const element of elements) {\n // we stop checking if it's hidden at the `container` level (excluding)\n if (!isHidden(element, { upTo: container })) return element;\n }\n}\n\nfunction isHidden(node: HTMLElement, { upTo }: { upTo?: HTMLElement }) {\n if (getComputedStyle(node).visibility === 'hidden') return true;\n while (node) {\n // we stop at `upTo` (excluding it)\n if (upTo !== undefined && node === upTo) return false;\n if (getComputedStyle(node).display === 'none') return true;\n node = node.parentElement as HTMLElement;\n }\n return false;\n}\n\nfunction isSelectableInput(element: any): element is FocusableTarget & { select: () => void } {\n return element instanceof HTMLInputElement && 'select' in element;\n}\n\nfunction focus(element?: FocusableTarget | null, { select = false } = {}) {\n // only focus if that element is focusable\n if (element && element.focus) {\n const previouslyFocusedElement = document.activeElement;\n // NOTE: we prevent scrolling on focus, to minimize jarring transitions for users\n element.focus({ preventScroll: true });\n // only select if its not the same element, it supports selection and we need to select\n if (element !== previouslyFocusedElement && isSelectableInput(element) && select)\n element.select();\n }\n}\n\n/* -------------------------------------------------------------------------------------------------\n * FocusScope stack\n * -----------------------------------------------------------------------------------------------*/\n\ntype FocusScopeAPI = { paused: boolean; pause(): void; resume(): void };\nconst focusScopesStack = createFocusScopesStack();\n\nfunction createFocusScopesStack() {\n /** A stack of focus scopes, with the active one at the top */\n let stack: FocusScopeAPI[] = [];\n\n return {\n add(focusScope: FocusScopeAPI) {\n // pause the currently active focus scope (at the top of the stack)\n const activeFocusScope = stack[0];\n if (focusScope !== activeFocusScope) {\n activeFocusScope?.pause();\n }\n // remove in case it already exists (because we'll re-add it at the top of the stack)\n stack = arrayRemove(stack, focusScope);\n stack.unshift(focusScope);\n },\n\n remove(focusScope: FocusScopeAPI) {\n stack = arrayRemove(stack, focusScope);\n stack[0]?.resume();\n },\n };\n}\n\nfunction arrayRemove<T>(array: T[], item: T) {\n const updatedArray = [...array];\n const index = updatedArray.indexOf(item);\n if (index !== -1) {\n updatedArray.splice(index, 1);\n }\n return updatedArray;\n}\n\nfunction removeLinks(items: HTMLElement[]) {\n return items.filter((item) => item.tagName !== 'A');\n}\n\nconst Root = FocusScope;\n\nexport {\n FocusScope,\n //\n Root,\n};\nexport type { FocusScopeProps };\n"],
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"names": ["handleFocusIn", "handleFocusOut", "handleMutations", "container"]
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}
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