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8.6 KiB
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8.6 KiB
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All rights reserved.\n * This file is licensed to you under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License. You may obtain a copy\n * of the License at http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software distributed under\n * the License is distributed on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS\n * OF ANY KIND, either express or implied. See the License for the specific language\n * governing permissions and limitations under the License.\n */\n\n// Keeps a ref count of all hidden elements. Added to when hiding an element, and\n// subtracted from when showing it again. When it reaches zero, aria-hidden is removed.\nlet refCountMap = new WeakMap<Element, number>();\ninterface ObserverWrapper {\n observe: () => void,\n disconnect: () => void\n}\nlet observerStack: Array<ObserverWrapper> = [];\n\n/**\n * Hides all elements in the DOM outside the given targets from screen readers using aria-hidden,\n * and returns a function to revert these changes. In addition, changes to the DOM are watched\n * and new elements outside the targets are automatically hidden.\n * @param targets - The elements that should remain visible.\n * @param root - Nothing will be hidden above this element.\n * @returns - A function to restore all hidden elements.\n */\nexport function ariaHideOutside(targets: Element[], root = document.body) {\n let visibleNodes = new Set<Element>(targets);\n let hiddenNodes = new Set<Element>();\n\n let walk = (root: Element) => {\n // Keep live announcer and top layer elements (e.g. toasts) visible.\n for (let element of root.querySelectorAll('[data-live-announcer], [data-react-aria-top-layer]')) {\n visibleNodes.add(element);\n }\n\n let acceptNode = (node: Element) => {\n // Skip this node and its children if it is one of the target nodes, or a live announcer.\n // Also skip children of already hidden nodes, as aria-hidden is recursive. An exception is\n // made for elements with role=\"row\" since VoiceOver on iOS has issues hiding elements with role=\"row\".\n // For that case we want to hide the cells inside as well (https://bugs.webkit.org/show_bug.cgi?id=222623).\n if (\n visibleNodes.has(node) ||\n (node.parentElement && hiddenNodes.has(node.parentElement) && node.parentElement.getAttribute('role') !== 'row')\n ) {\n return NodeFilter.FILTER_REJECT;\n }\n\n // Skip this node but continue to children if one of the targets is inside the node.\n for (let target of visibleNodes) {\n if (node.contains(target)) {\n return NodeFilter.FILTER_SKIP;\n }\n }\n\n return NodeFilter.FILTER_ACCEPT;\n };\n\n let walker = document.createTreeWalker(\n root,\n NodeFilter.SHOW_ELEMENT,\n {acceptNode}\n );\n\n // TreeWalker does not include the root.\n let acceptRoot = acceptNode(root);\n if (acceptRoot === NodeFilter.FILTER_ACCEPT) {\n hide(root);\n }\n\n if (acceptRoot !== NodeFilter.FILTER_REJECT) {\n let node = walker.nextNode() as Element;\n while (node != null) {\n hide(node);\n node = walker.nextNode() as Element;\n }\n }\n };\n\n let hide = (node: Element) => {\n let refCount = refCountMap.get(node) ?? 0;\n\n // If already aria-hidden, and the ref count is zero, then this element\n // was already hidden and there's nothing for us to do.\n if (node.getAttribute('aria-hidden') === 'true' && refCount === 0) {\n return;\n }\n\n if (refCount === 0) {\n node.setAttribute('aria-hidden', 'true');\n }\n\n hiddenNodes.add(node);\n refCountMap.set(node, refCount + 1);\n };\n\n // If there is already a MutationObserver listening from a previous call,\n // disconnect it so the new on takes over.\n if (observerStack.length) {\n observerStack[observerStack.length - 1].disconnect();\n }\n\n walk(root);\n\n let observer = new MutationObserver(changes => {\n for (let change of changes) {\n if (change.type !== 'childList' || change.addedNodes.length === 0) {\n continue;\n }\n\n // If the parent element of the added nodes is not within one of the targets,\n // and not already inside a hidden node, hide all of the new children.\n if (![...visibleNodes, ...hiddenNodes].some(node => node.contains(change.target))) {\n for (let node of change.removedNodes) {\n if (node instanceof Element) {\n visibleNodes.delete(node);\n hiddenNodes.delete(node);\n }\n }\n\n for (let node of change.addedNodes) {\n if (\n (node instanceof HTMLElement || node instanceof SVGElement) &&\n (node.dataset.liveAnnouncer === 'true' || node.dataset.reactAriaTopLayer === 'true')\n ) {\n visibleNodes.add(node);\n } else if (node instanceof Element) {\n walk(node);\n }\n }\n }\n }\n });\n\n observer.observe(root, {childList: true, subtree: true});\n\n let observerWrapper: ObserverWrapper = {\n observe() {\n observer.observe(root, {childList: true, subtree: true});\n },\n disconnect() {\n observer.disconnect();\n }\n };\n\n observerStack.push(observerWrapper);\n\n return () => {\n observer.disconnect();\n\n for (let node of hiddenNodes) {\n let count = refCountMap.get(node);\n if (count == null) {\n continue;\n }\n if (count === 1) {\n node.removeAttribute('aria-hidden');\n refCountMap.delete(node);\n } else {\n refCountMap.set(node, count - 1);\n }\n }\n\n // Remove this observer from the stack, and start the previous one.\n if (observerWrapper === observerStack[observerStack.length - 1]) {\n observerStack.pop();\n if (observerStack.length) {\n observerStack[observerStack.length - 1].observe();\n }\n } else {\n observerStack.splice(observerStack.indexOf(observerWrapper), 1);\n }\n };\n}\n"],"names":[],"version":3,"file":"ariaHideOutside.main.js.map"} |