element-plus/es/components/focus-trap/src/focus-trap.mjs.map

A Component Library for Vue 3

{"version":3,"file":"focus-trap.mjs","sources":["../../../../../../packages/components/focus-trap/src/focus-trap.vue"],"sourcesContent":["<template>\n  <slot :handle-keydown=\"onKeydown\" />\n</template>\n\n<script lang=\"ts\">\nimport {\n  defineComponent,\n  nextTick,\n  onBeforeUnmount,\n  onMounted,\n  provide,\n  ref,\n  unref,\n  watch,\n} from 'vue'\nimport { isNil } from 'lodash-unified'\nimport { EVENT_CODE } from '@element-plus/constants'\nimport { useEscapeKeydown } from '@element-plus/hooks'\nimport { isString } from '@element-plus/utils'\nimport {\n  createFocusOutPreventedEvent,\n  focusFirstDescendant,\n  focusableStack,\n  getEdges,\n  isFocusCausedByUserEvent,\n  obtainAllFocusableElements,\n  tryFocus,\n  useFocusReason,\n} from './utils'\nimport {\n  FOCUS_AFTER_RELEASED,\n  FOCUS_AFTER_TRAPPED,\n  FOCUS_AFTER_TRAPPED_OPTS,\n  FOCUS_TRAP_INJECTION_KEY,\n  ON_RELEASE_FOCUS_EVT,\n  ON_TRAP_FOCUS_EVT,\n} from './tokens'\n\nimport type { PropType } from 'vue'\nimport type { FocusLayer } from './utils'\n\nexport default defineComponent({\n  name: 'ElFocusTrap',\n  inheritAttrs: false,\n  props: {\n    loop: Boolean,\n    trapped: Boolean,\n    focusTrapEl: Object as PropType<HTMLElement>,\n    focusStartEl: {\n      type: [Object, String] as PropType<'container' | 'first' | HTMLElement>,\n      default: 'first',\n    },\n  },\n  emits: [\n    ON_TRAP_FOCUS_EVT,\n    ON_RELEASE_FOCUS_EVT,\n    'focusin',\n    'focusout',\n    'focusout-prevented',\n    'release-requested',\n  ],\n  setup(props, { emit }) {\n    const forwardRef = ref<HTMLElement | undefined>()\n    let lastFocusBeforeTrapped: HTMLElement | null\n    let lastFocusAfterTrapped: HTMLElement | null\n\n    const { focusReason } = useFocusReason()\n\n    useEscapeKeydown((event) => {\n      if (props.trapped && !focusLayer.paused) {\n        emit('release-requested', event)\n      }\n    })\n\n    const focusLayer: FocusLayer = {\n      paused: false,\n      pause() {\n        this.paused = true\n      },\n      resume() {\n        this.paused = false\n      },\n    }\n\n    const onKeydown = (e: KeyboardEvent) => {\n      if (!props.loop && !props.trapped) return\n      if (focusLayer.paused) return\n\n      const { code, altKey, ctrlKey, metaKey, currentTarget, shiftKey } = e\n      const { loop } = props\n      const isTabbing =\n        code === EVENT_CODE.tab && !altKey && !ctrlKey && !metaKey\n\n      const currentFocusingEl = document.activeElement\n      if (isTabbing && currentFocusingEl) {\n        const container = currentTarget as HTMLElement\n        const [first, last] = getEdges(container)\n        const isTabbable = first && last\n        if (!isTabbable) {\n          if (currentFocusingEl === container) {\n            const focusoutPreventedEvent = createFocusOutPreventedEvent({\n              focusReason: focusReason.value,\n            })\n            emit('focusout-prevented', focusoutPreventedEvent)\n            if (!focusoutPreventedEvent.defaultPrevented) {\n              e.preventDefault()\n            }\n          }\n        } else {\n          if (!shiftKey && currentFocusingEl === last) {\n            const focusoutPreventedEvent = createFocusOutPreventedEvent({\n              focusReason: focusReason.value,\n            })\n            emit('focusout-prevented', focusoutPreventedEvent)\n            if (!focusoutPreventedEvent.defaultPrevented) {\n              e.preventDefault()\n              if (loop) tryFocus(first, true)\n            }\n          } else if (\n            shiftKey &&\n            [first, container].includes(currentFocusingEl as HTMLElement)\n          ) {\n            const focusoutPreventedEvent = createFocusOutPreventedEvent({\n              focusReason: focusReason.value,\n            })\n            emit('focusout-prevented', focusoutPreventedEvent)\n            if (!focusoutPreventedEvent.defaultPrevented) {\n              e.preventDefault()\n              if (loop) tryFocus(last, true)\n            }\n          }\n        }\n      }\n    }\n\n    provide(FOCUS_TRAP_INJECTION_KEY, {\n      focusTrapRef: forwardRef,\n      onKeydown,\n    })\n\n    watch(\n      () => props.focusTrapEl,\n      (focusTrapEl) => {\n        if (focusTrapEl) {\n          forwardRef.value = focusTrapEl\n        }\n      },\n      { immediate: true }\n    )\n\n    watch([forwardRef], ([forwardRef], [oldForwardRef]) => {\n      if (forwardRef) {\n        forwardRef.addEventListener('keydown', onKeydown)\n        forwardRef.addEventListener('focusin', onFocusIn)\n        forwardRef.addEventListener('focusout', onFocusOut)\n      }\n      if (oldForwardRef) {\n        oldForwardRef.removeEventListener('keydown', onKeydown)\n        oldForwardRef.removeEventListener('focusin', onFocusIn)\n        oldForwardRef.removeEventListener('focusout', onFocusOut)\n      }\n    })\n\n    const trapOnFocus = (e: Event) => {\n      emit(ON_TRAP_FOCUS_EVT, e)\n    }\n    const releaseOnFocus = (e: Event) => emit(ON_RELEASE_FOCUS_EVT, e)\n\n    const onFocusIn = (e: FocusEvent) => {\n      const trapContainer = unref(forwardRef)\n      if (!trapContainer) return\n\n      const target = e.target as HTMLElement | null\n      const relatedTarget = e.relatedTarget as HTMLElement | null\n      const isFocusedInTrap = target && trapContainer.contains(target)\n\n      if (!props.trapped) {\n        const isPrevFocusedInTrap =\n          relatedTarget && trapContainer.contains(relatedTarget)\n        if (!isPrevFocusedInTrap) {\n          lastFocusBeforeTrapped = relatedTarget\n        }\n      }\n\n      if (isFocusedInTrap) emit('focusin', e)\n\n      if (focusLayer.paused) return\n\n      if (props.trapped) {\n        if (isFocusedInTrap) {\n          lastFocusAfterTrapped = target\n        } else {\n          tryFocus(lastFocusAfterTrapped, true)\n        }\n      }\n    }\n\n    const onFocusOut = (e: Event) => {\n      const trapContainer = unref(forwardRef)\n      if (focusLayer.paused || !trapContainer) return\n\n      if (props.trapped) {\n        const relatedTarget = (e as FocusEvent)\n          .relatedTarget as HTMLElement | null\n        if (!isNil(relatedTarget) && !trapContainer.contains(relatedTarget)) {\n          // Give embedded focus layer time to pause this layer before reclaiming focus\n          // And only reclaim focus if it should currently be trapping\n          setTimeout(() => {\n            if (!focusLayer.paused && props.trapped) {\n              const focusoutPreventedEvent = createFocusOutPreventedEvent({\n                focusReason: focusReason.value,\n              })\n              emit('focusout-prevented', focusoutPreventedEvent)\n              if (!focusoutPreventedEvent.defaultPrevented) {\n                tryFocus(lastFocusAfterTrapped, true)\n              }\n            }\n          }, 0)\n        }\n      } else {\n        const target = e.target as HTMLElement | null\n        const isFocusedInTrap = target && trapContainer.contains(target)\n        if (!isFocusedInTrap) emit('focusout', e)\n      }\n    }\n\n    async function startTrap() {\n      // Wait for forwardRef to resolve\n      await nextTick()\n      const trapContainer = unref(forwardRef)\n      if (trapContainer) {\n        focusableStack.push(focusLayer)\n        const prevFocusedElement = trapContainer.contains(\n          document.activeElement\n        )\n          ? lastFocusBeforeTrapped\n          : document.activeElement\n        lastFocusBeforeTrapped = prevFocusedElement as HTMLElement | null\n        const isPrevFocusContained = trapContainer.contains(prevFocusedElement)\n        if (!isPrevFocusContained) {\n          const focusEvent = new Event(\n            FOCUS_AFTER_TRAPPED,\n            FOCUS_AFTER_TRAPPED_OPTS\n          )\n          trapContainer.addEventListener(FOCUS_AFTER_TRAPPED, trapOnFocus)\n          trapContainer.dispatchEvent(focusEvent)\n          if (!focusEvent.defaultPrevented) {\n            nextTick(() => {\n              let focusStartEl = props.focusStartEl\n              if (!isString(focusStartEl)) {\n                tryFocus(focusStartEl)\n                if (document.activeElement !== focusStartEl) {\n                  focusStartEl = 'first'\n                }\n              }\n              if (focusStartEl === 'first') {\n                focusFirstDescendant(\n                  obtainAllFocusableElements(trapContainer),\n                  true\n                )\n              }\n              if (\n                document.activeElement === prevFocusedElement ||\n                focusStartEl === 'container'\n              ) {\n                tryFocus(trapContainer)\n              }\n            })\n          }\n        }\n      }\n    }\n\n    function stopTrap() {\n      const trapContainer = unref(forwardRef)\n\n      if (trapContainer) {\n        trapContainer.removeEventListener(FOCUS_AFTER_TRAPPED, trapOnFocus)\n\n        const releasedEvent = new CustomEvent(FOCUS_AFTER_RELEASED, {\n          ...FOCUS_AFTER_TRAPPED_OPTS,\n          detail: {\n            focusReason: focusReason.value,\n          },\n        })\n        trapContainer.addEventListener(FOCUS_AFTER_RELEASED, releaseOnFocus)\n        trapContainer.dispatchEvent(releasedEvent)\n        if (\n          !releasedEvent.defaultPrevented &&\n          (focusReason.value == 'keyboard' ||\n            !isFocusCausedByUserEvent() ||\n            trapContainer.contains(document.activeElement))\n        ) {\n          tryFocus(lastFocusBeforeTrapped ?? document.body)\n        }\n\n        trapContainer.removeEventListener(FOCUS_AFTER_RELEASED, releaseOnFocus)\n        focusableStack.remove(focusLayer)\n      }\n    }\n\n    onMounted(() => {\n      if (props.trapped) {\n        startTrap()\n      }\n\n      watch(\n        () => props.trapped,\n        (trapped) => {\n          if (trapped) {\n            startTrap()\n          } else {\n            stopTrap()\n          }\n  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