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✏️ Editing: focustrap.js

/**
 * --------------------------------------------------------------------------
 * Bootstrap util/focustrap.js
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
 * --------------------------------------------------------------------------
 */

import EventHandler from '../dom/event-handler.js'
import SelectorEngine from '../dom/selector-engine.js'
import Config from './config.js'

/**
 * Constants
 */

const NAME = 'focustrap'
const DATA_KEY = 'bs.focustrap'
const EVENT_KEY = `.${DATA_KEY}`
const EVENT_FOCUSIN = `focusin${EVENT_KEY}`
const EVENT_KEYDOWN_TAB = `keydown.tab${EVENT_KEY}`

const TAB_KEY = 'Tab'
const TAB_NAV_FORWARD = 'forward'
const TAB_NAV_BACKWARD = 'backward'

const Default = {
  autofocus: true,
  trapElement: null // The element to trap focus inside of
}

const DefaultType = {
  autofocus: 'boolean',
  trapElement: 'element'
}

/**
 * Class definition
 */

class FocusTrap extends Config {
  constructor(config) {
    super()
    this._config = this._getConfig(config)
    this._isActive = false
    this._lastTabNavDirection = null
  }

// Getters
  static get Default() {
    return Default
  }

static get DefaultType() {
    return DefaultType
  }

static get NAME() {
    return NAME
  }

// Public
  activate() {
    if (this._isActive) {
      return
    }

if (this._config.autofocus) {
      this._config.trapElement.focus()
    }

EventHandler.off(document, EVENT_KEY) // guard against infinite focus loop
    EventHandler.on(document, EVENT_FOCUSIN, event => this._handleFocusin(event))
    EventHandler.on(document, EVENT_KEYDOWN_TAB, event => this._handleKeydown(event))

this._isActive = true
  }

deactivate() {
    if (!this._isActive) {
      return
    }

this._isActive = false
    EventHandler.off(document, EVENT_KEY)
  }

// Private
  _handleFocusin(event) {
    const { trapElement } = this._config

if (event.target === document || event.target === trapElement || trapElement.contains(event.target)) {
      return
    }

const elements = SelectorEngine.focusableChildren(trapElement)

if (elements.length === 0) {
      trapElement.focus()
    } else if (this._lastTabNavDirection === TAB_NAV_BACKWARD) {
      elements[elements.length - 1].focus()
    } else {
      elements[0].focus()
    }
  }

_handleKeydown(event) {
    if (event.key !== TAB_KEY) {
      return
    }

this._lastTabNavDirection = event.shiftKey ? TAB_NAV_BACKWARD : TAB_NAV_FORWARD
  }
}

export default FocusTrap

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