{"version":3,"file":"FocusScope.js","sources":["../../src/FocusScope/FocusScope.vue"],"sourcesContent":["<script lang=\"ts\">\nimport type { PrimitiveProps } from '@/Primitive'\nimport { getActiveElement, useForwardExpose } from '@/shared'\n\nexport type FocusScopeEmits = {\n  /**\n   * Event handler called when auto-focusing on mount.\n   * Can be prevented.\n   */\n  mountAutoFocus: [event: Event]\n\n  /**\n   * Event handler called when auto-focusing on unmount.\n   * Can be prevented.\n   */\n  unmountAutoFocus: [event: Event]\n}\n\nexport interface FocusScopeProps extends PrimitiveProps {\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</script>\n\n<script setup lang=\"ts\">\nimport { isClient } from '@vueuse/shared'\nimport { nextTick, reactive, ref, watchEffect } from 'vue'\nimport { Primitive } from '@/Primitive'\nimport { createFocusScopesStack, removeLinks } from './stack'\nimport {\n  AUTOFOCUS_ON_MOUNT,\n  AUTOFOCUS_ON_UNMOUNT,\n  EVENT_OPTIONS,\n  focus,\n  focusFirst,\n  getTabbableCandidates,\n  getTabbableEdges,\n} from './utils'\n\nconst props = withDefaults(defineProps<FocusScopeProps>(), {\n  loop: false,\n  trapped: false,\n})\nconst emits = defineEmits<FocusScopeEmits>()\n\nconst { currentRef, currentElement } = useForwardExpose()\nconst lastFocusedElementRef = ref<HTMLElement | null>(null)\nconst focusScopesStack = createFocusScopesStack()\n\nconst focusScope = reactive({\n  paused: false,\n  pause() {\n    this.paused = true\n  },\n  resume() {\n    this.paused = false\n  },\n})\n\nwatchEffect((cleanupFn) => {\n  if (!isClient)\n    return\n  const container = currentElement.value\n  if (!props.trapped)\n    return\n\n  function handleFocusIn(event: FocusEvent) {\n    if (focusScope.paused || !container)\n      return\n    const target = event.target as HTMLElement | null\n    if (container.contains(target))\n      lastFocusedElementRef.value = target\n    else focus(lastFocusedElementRef.value, { select: true })\n  }\n\n  function handleFocusOut(event: FocusEvent) {\n    if (focusScope.paused || !container)\n      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)\n      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.value, { select: true })\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  // -- related: https://github.com/unovue/reka-ui/issues/518\n  // Reka UI tentative solution:\n  // instead of leaning on document.activeElement, we use lastFocusedElementRef.value to check\n  // if the element still exist inside the container,\n  // if not then we focus to the container\n  function handleMutations(mutations: MutationRecord[]) {\n    const isLastFocusedElementExist = container.contains(lastFocusedElementRef.value)\n    if (!isLastFocusedElementExist)\n      focus(container)\n  }\n\n  document.addEventListener('focusin', handleFocusIn)\n  document.addEventListener('focusout', handleFocusOut)\n  const mutationObserver = new MutationObserver(handleMutations)\n  if (container)\n    mutationObserver.observe(container, { childList: true, subtree: true })\n\n  cleanupFn(() => {\n    document.removeEventListener('focusin', handleFocusIn)\n    document.removeEventListener('focusout', handleFocusOut)\n    mutationObserver.disconnect()\n  })\n})\n\nwatchEffect(async (cleanupFn) => {\n  const container = currentElement.value\n\n  await nextTick()\n  if (!container)\n    return\n  focusScopesStack.add(focusScope)\n  const previouslyFocusedElement = getActiveElement() 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, (ev: Event) =>\n      emits('mountAutoFocus', ev))\n    container.dispatchEvent(mountEvent)\n\n    if (!mountEvent.defaultPrevented) {\n      focusFirst(removeLinks(getTabbableCandidates(container)), {\n        select: true,\n      })\n      if (getActiveElement() === previouslyFocusedElement)\n        focus(container)\n    }\n  }\n\n  cleanupFn(() => {\n    container.removeEventListener(AUTOFOCUS_ON_MOUNT, (ev: Event) =>\n      emits('mountAutoFocus', ev))\n\n    const unmountEvent = new CustomEvent(AUTOFOCUS_ON_UNMOUNT, EVENT_OPTIONS)\n    const unmountEventHandler = (ev: Event) => {\n      emits('unmountAutoFocus', ev)\n    }\n    container.addEventListener(AUTOFOCUS_ON_UNMOUNT, unmountEventHandler)\n    container.dispatchEvent(unmountEvent)\n\n    setTimeout(() => {\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, unmountEventHandler)\n\n      focusScopesStack.remove(focusScope)\n    }, 0)\n  })\n})\n\nfunction handleKeyDown(event: KeyboardEvent) {\n  if (!props.loop && !props.trapped)\n    return\n  if (focusScope.paused)\n    return\n\n  const isTabKey\n    = event.key === 'Tab' && !event.altKey && !event.ctrlKey && !event.metaKey\n  const focusedElement = getActiveElement() 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)\n        event.preventDefault()\n    }\n    else {\n      if (!event.shiftKey && focusedElement === last) {\n        event.preventDefault()\n        if (props.loop)\n          focus(first, { select: true })\n      }\n      else if (event.shiftKey && focusedElement === first) {\n        event.preventDefault()\n        if (props.loop)\n          focus(last, { select: true })\n      }\n    }\n  }\n}\n</script>\n\n<template>\n  <Primitive\n    ref=\"currentRef\"\n    tabindex=\"-1\"\n    :as-child=\"asChild\"\n    :as=\"as\"\n    @keydown=\"handleKeyDown\"\n  >\n    <slot />\n  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