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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 | 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 112x 112x 112x 112x 112x 112x 66x 66x 65x 66x 205x 66x 66x 28x 5x 23x 23x 205x 205x 2x 203x 203x 200x 3x 1x 2x 10x 6x 4x | /**
* --------------------------------------------------------------------------
* Bootstrap (v5.2.3): util/focustrap.js
* Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
* --------------------------------------------------------------------------
*/
import EventHandler from '../dom/event-handler'
import SelectorEngine from '../dom/selector-engine'
import Config from './config'
/**
* 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() {
Iif (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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