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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\nimport {chain, getScrollParent, isIOS, isScrollable, useLayoutEffect, willOpenKeyboard} from '@react-aria/utils';\n\ninterface PreventScrollOptions {\n  /** Whether the scroll lock is disabled. */\n  isDisabled?: boolean\n}\n\nconst visualViewport = typeof document !== 'undefined' && window.visualViewport;\n\n// The number of active usePreventScroll calls. Used to determine whether to revert back to the original page style/scroll position\nlet preventScrollCount = 0;\nlet restore;\n\n/**\n * Prevents scrolling on the document body on mount, and\n * restores it on unmount. Also ensures that content does not\n * shift due to the scrollbars disappearing.\n */\nexport function usePreventScroll(options: PreventScrollOptions = {}): void {\n  let {isDisabled} = options;\n\n  useLayoutEffect(() => {\n    if (isDisabled) {\n      return;\n    }\n\n    preventScrollCount++;\n    if (preventScrollCount === 1) {\n      if (isIOS()) {\n        restore = preventScrollMobileSafari();\n      } else {\n        restore = preventScrollStandard();\n      }\n    }\n\n    return () => {\n      preventScrollCount--;\n      if (preventScrollCount === 0) {\n        restore();\n      }\n    };\n  }, [isDisabled]);\n}\n\n// For most browsers, all we need to do is set `overflow: hidden` on the root element, and\n// add some padding to prevent the page from shifting when the scrollbar is hidden.\nfunction preventScrollStandard() {\n  let scrollbarWidth = window.innerWidth - document.documentElement.clientWidth;\n  return chain(\n    scrollbarWidth > 0 &&\n      // Use scrollbar-gutter when supported because it also works for fixed positioned elements.\n      ('scrollbarGutter' in document.documentElement.style\n        ? setStyle(document.documentElement, 'scrollbarGutter', 'stable')\n        : setStyle(document.documentElement, 'paddingRight', `${scrollbarWidth}px`)),\n    setStyle(document.documentElement, 'overflow', 'hidden')\n  );\n}\n\n// Mobile Safari is a whole different beast. Even with overflow: hidden,\n// it still scrolls the page in many situations:\n//\n// 1. When the bottom toolbar and address bar are collapsed, page scrolling is always allowed.\n// 2. When the keyboard is visible, the viewport does not resize. Instead, the keyboard covers part of\n//    it, so it becomes scrollable.\n// 3. When tapping on an input, the page always scrolls so that the input is centered in the visual viewport.\n//    This may cause even fixed position elements to scroll off the screen.\n// 4. When using the next/previous buttons in the keyboard to navigate between inputs, the whole page always\n//    scrolls, even if the input is inside a nested scrollable element that could be scrolled instead.\n//\n// In order to work around these cases, and prevent scrolling without jankiness, we do a few things:\n//\n// 1. Prevent default on `touchmove` events that are not in a scrollable element. This prevents touch scrolling\n//    on the window.\n// 2. Set `overscroll-behavior: contain` on nested scrollable regions so they do not scroll the page when at\n//    the top or bottom. Work around a bug where this does not work when the element does not actually overflow\n//    by preventing default in a `touchmove` event. This is best effort: we can't prevent default when pinch\n//    zooming or when an element contains text selection, which may allow scrolling in some cases.\n// 3. Prevent default on `touchend` events on input elements and handle focusing the element ourselves.\n// 4. When focus moves to an input, create an off screen input and focus that temporarily. This prevents \n//    Safari from scrolling the page. After a small delay, focus the real input and scroll it into view\n//    ourselves, without scrolling the whole page.\nfunction preventScrollMobileSafari() {\n  let scrollable: Element;\n  let allowTouchMove = false;\n  let onTouchStart = (e: TouchEvent) => {\n    // Store the nearest scrollable parent element from the element that the user touched.\n    let target = e.target as Element;\n    scrollable = isScrollable(target) ? target : getScrollParent(target, true);\n    allowTouchMove = false;\n    \n    // If the target is selected, don't preventDefault in touchmove to allow user to adjust selection.\n    let selection = target.ownerDocument.defaultView!.getSelection();\n    if (selection && !selection.isCollapsed && selection.containsNode(target, true)) {\n      allowTouchMove = true;\n    }\n\n    // If this is a focused input element with a selected range, allow user to drag the selection handles.\n    if (\n      'selectionStart' in target && \n      'selectionEnd' in target &&\n      (target.selectionStart as number) < (target.selectionEnd as number) &&\n      target.ownerDocument.activeElement === target\n    ) {\n      allowTouchMove = true;\n    }\n  };\n\n  // Prevent scrolling up when at the top and scrolling down when at the bottom\n  // of a nested scrollable area, otherwise mobile Safari will start scrolling\n  // the window instead.\n  // This must be applied before the touchstart event as of iOS 26, so inject it as a <style> element.\n  let style = document.createElement('style');\n  style.textContent = `\n@layer {\n  * {\n    overscroll-behavior: contain;\n  }\n}`.trim();\n  document.head.prepend(style);\n\n  let onTouchMove = (e: TouchEvent) => {\n    // Allow pinch-zooming.\n    if (e.touches.length === 2 || allowTouchMove) {\n      return;\n    }\n\n    // Prevent scrolling the window.\n    if (!scrollable || scrollable === document.documentElement || scrollable === document.body) {\n      e.preventDefault();\n      return;\n    }\n\n    // overscroll-behavior should prevent scroll chaining, but currently does not\n    // if the element doesn't actually overflow. https://bugs.webkit.org/show_bug.cgi?id=243452\n    // This checks that both the width and height do not overflow, otherwise we might\n    // block horizontal scrolling too. In that case, adding `touch-action: pan-x` to\n    // the element will prevent vertical page scrolling. We can't add that automatically\n    // because it must be set before the touchstart event.\n    if (scrollable.scrollHeight === scrollable.clientHeight && scrollable.scrollWidth === scrollable.clientWidth) {\n      e.preventDefault();\n    }\n  };\n\n  let onBlur = (e: FocusEvent) => {\n    let target = e.target as HTMLElement;\n    let relatedTarget = e.relatedTarget as HTMLElement | null;\n    if (relatedTarget && willOpenKeyboard(relatedTarget)) {\n      // Focus without scrolling the whole page, and then scroll into view manually.\n      relatedTarget.focus({preventScroll: true});\n      scrollIntoViewWhenReady(relatedTarget, willOpenKeyboard(target));\n    } else if (!relatedTarget) {\n      // When tapping the Done button on the keyboard, focus moves to the body.\n      // FocusScope will then restore focus back to the input. Later when tapping\n      // the same input again, it is already focused, so no blur event will fire,\n      // resulting in the flow above never running and Safari's native scrolling occurring.\n      // Instead, move focus to the parent focusable element (e.g. the dialog).\n      let focusable = target.parentElement?.closest('[tabindex]') as HTMLElement | null;\n      focusable?.focus({preventScroll: true});\n    }\n  };\n\n  // Override programmatic focus to scroll into view without scrolling the whole page.\n  let focus = HTMLElement.prototype.focus;\n  HTMLElement.prototype.focus = function (opts) {\n    // Track whether the keyboard was already visible before.\n    let wasKeyboardVisible = document.activeElement != null && willOpenKeyboard(document.activeElement);\n\n    // Focus the element without scrolling the page.\n    focus.call(this, {...opts, preventScroll: true});\n\n    if (!opts || !opts.preventScroll) {\n      scrollIntoViewWhenReady(this, wasKeyboardVisible);\n    }\n  };\n\n  let removeEvents = chain(\n    addEvent(document, 'touchstart', onTouchStart, {passive: false, capture: true}),\n    addEvent(document, 'touchmove', onTouchMove, {passive: false, capture: true}),\n    addEvent(document, 'blur', onBlur, true)\n  );\n\n  return () => {\n    removeEvents();\n    style.remove();\n    HTMLElement.prototype.focus = focus;\n  };\n}\n\n// Sets a CSS property on an element, and returns a function to revert it to the previous value.\nfunction setStyle(element: HTMLElement, style: string, value: string) {\n  let cur = element.style[style];\n  element.style[style] = value;\n\n  return () => {\n    element.style[style] = cur;\n  };\n}\n\n// Adds an event listener to an element, and returns a function to remove it.\nfunction addEvent<K extends keyof GlobalEventHandlersEventMap>(\n  target: Document | Window,\n  event: K,\n  handler: (this: Document | Window, ev: GlobalEventHandlersEventMap[K]) => any,\n  options?: boolean | AddEventListenerOptions\n) {\n  // internal function, so it's ok to ignore the difficult to fix type error\n  // @ts-ignore\n  target.addEventListener(event, handler, options);\n  return () => {\n    // @ts-ignore\n    target.removeEventListener(event, handler, options);\n  };\n}\n\nfunction scrollIntoViewWhenReady(target: Element, wasKeyboardVisible: boolean) {\n  if (wasKeyboardVisible || !visualViewport) {\n    // If the keyboard was already visible, scroll the target into view immediately.\n    scrollIntoView(target);\n  } else {\n    // Otherwise, wait for the visual viewport to resize before scrolling so we can\n    // measure the correct position to scroll to.\n    visualViewport.addEventListener('resize', () => scrollIntoView(target), {once: true});\n  }\n}\n\nfunction scrollIntoView(target: Element) {\n  let root = document.scrollingElement || document.documentElement;\n  let nextTarget: Element | null = target;\n  while (nextTarget && nextTarget !== root) {\n    // Find the parent scrollable element and adjust the scroll position if the target is not already in view.\n    let scrollable = getScrollParent(nextTarget);\n    if (scrollable !== document.documentElement && scrollable !== document.body && scrollable !== nextTarget) {\n      let scrollableRect = scrollable.getBoundingClientRect();\n      let targetRect = nextTarget.getBoundingClientRect();\n      if (targetRect.top < scrollableRect.top || targetRect.bottom > scrollableRect.top + nextTarget.clientHeight) {\n        let bottom = scrollableRect.bottom;\n        if (visualViewport) {\n          bottom = Math.min(bottom, visualViewport.offsetTop + visualViewport.height);\n        }\n\n        // Center within the viewport.\n        let adjustment = (targetRect.top - scrollableRect.top) - ((bottom - scrollableRect.top) / 2 - targetRect.height / 2);\n        scrollable.scrollTo({\n          // Clamp to the valid range to prevent over-scrolling.\n          top: Math.max(0, Math.min(scrollable.scrollHeight - scrollable.clientHeight, scrollable.scrollTop + adjustment)),\n          behavior: 'smooth'\n        });\n      }\n    }\n\n    nextTarget = scrollable.parentElement;\n  }\n}\n"],"names":[],"version":3,"file":"usePreventScroll.module.js.map"}