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* --------------------------------------------------------------------------
* Bootstrap (v5.2.3): dom/event-handler.js
* Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
* --------------------------------------------------------------------------
*/
import { getjQuery } from '../util/index'
/**
* Constants
*/
const namespaceRegex = /[^.]*(?=\..*)\.|.*/
const stripNameRegex = /\..*/
const stripUidRegex = /::\d+$/
const eventRegistry = {} // Events storage
let uidEvent = 1
const customEvents = {
mouseenter: 'mouseover',
mouseleave: 'mouseout'
}
const nativeEvents = new Set([
'click',
'dblclick',
'mouseup',
'mousedown',
'contextmenu',
'mousewheel',
'DOMMouseScroll',
'mouseover',
'mouseout',
'mousemove',
'selectstart',
'selectend',
'keydown',
'keypress',
'keyup',
'orientationchange',
'touchstart',
'touchmove',
'touchend',
'touchcancel',
'pointerdown',
'pointermove',
'pointerup',
'pointerleave',
'pointercancel',
'gesturestart',
'gesturechange',
'gestureend',
'focus',
'blur',
'change',
'reset',
'select',
'submit',
'focusin',
'focusout',
'load',
'unload',
'beforeunload',
'resize',
'move',
'DOMContentLoaded',
'readystatechange',
'error',
'abort',
'scroll'
])
/**
* Private methods
*/
function makeEventUid(element, uid) {
return (uid && `${uid}::${uidEvent++}`) || element.uidEvent || uidEvent++
}
function getElementEvents(element) {
const uid = makeEventUid(element)
element.uidEvent = uid
eventRegistry[uid] = eventRegistry[uid] || {}
return eventRegistry[uid]
}
function bootstrapHandler(element, fn) {
return function handler(event) {
hydrateObj(event, { delegateTarget: element })
if (handler.oneOff) {
EventHandler.off(element, event.type, fn)
}
return fn.apply(element, [event])
}
}
function bootstrapDelegationHandler(element, selector, fn) {
return function handler(event) {
const domElements = element.querySelectorAll(selector)
for (let { target } = event; target && target !== this; target = target.parentNode) {
for (const domElement of domElements) {
if (domElement !== target) {
continue
}
hydrateObj(event, { delegateTarget: target })
if (handler.oneOff) {
EventHandler.off(element, event.type, selector, fn)
}
return fn.apply(target, [event])
}
}
}
}
function findHandler(events, callable, delegationSelector = null) {
return Object.values(events)
.find(event => event.callable === callable && event.delegationSelector === delegationSelector)
}
function normalizeParameters(originalTypeEvent, handler, delegationFunction) {
const isDelegated = typeof handler === 'string'
// todo: tooltip passes `false` instead of selector, so we need to check
const callable = isDelegated ? delegationFunction : (handler || delegationFunction)
let typeEvent = getTypeEvent(originalTypeEvent)
if (!nativeEvents.has(typeEvent)) {
typeEvent = originalTypeEvent
}
return [isDelegated, callable, typeEvent]
}
function addHandler(element, originalTypeEvent, handler, delegationFunction, oneOff) {
if (typeof originalTypeEvent !== 'string' || !element) {
return
}
let [isDelegated, callable, typeEvent] = normalizeParameters(originalTypeEvent, handler, delegationFunction)
// in case of mouseenter or mouseleave wrap the handler within a function that checks for its DOM position
// this prevents the handler from being dispatched the same way as mouseover or mouseout does
if (originalTypeEvent in customEvents) {
const wrapFunction = fn => {
return function (event) {
if (!event.relatedTarget || (event.relatedTarget !== event.delegateTarget && !event.delegateTarget.contains(event.relatedTarget))) {
return fn.call(this, event)
}
}
}
callable = wrapFunction(callable)
}
const events = getElementEvents(element)
const handlers = events[typeEvent] || (events[typeEvent] = {})
const previousFunction = findHandler(handlers, callable, isDelegated ? handler : null)
if (previousFunction) {
previousFunction.oneOff = previousFunction.oneOff && oneOff
return
}
const uid = makeEventUid(callable, originalTypeEvent.replace(namespaceRegex, ''))
const fn = isDelegated ?
bootstrapDelegationHandler(element, handler, callable) :
bootstrapHandler(element, callable)
fn.delegationSelector = isDelegated ? handler : null
fn.callable = callable
fn.oneOff = oneOff
fn.uidEvent = uid
handlers[uid] = fn
element.addEventListener(typeEvent, fn, isDelegated)
}
function removeHandler(element, events, typeEvent, handler, delegationSelector) {
const fn = findHandler(events[typeEvent], handler, delegationSelector)
Iif (!fn) {
return
}
element.removeEventListener(typeEvent, fn, Boolean(delegationSelector))
delete events[typeEvent][fn.uidEvent]
}
function removeNamespacedHandlers(element, events, typeEvent, namespace) {
const storeElementEvent = events[typeEvent] || {}
for (const handlerKey of Object.keys(storeElementEvent)) {
if (handlerKey.includes(namespace)) {
const event = storeElementEvent[handlerKey]
removeHandler(element, events, typeEvent, event.callable, event.delegationSelector)
}
}
}
function getTypeEvent(event) {
// allow to get the native events from namespaced events ('click.bs.button' --> 'click')
event = event.replace(stripNameRegex, '')
return customEvents[event] || event
}
const EventHandler = {
on(element, event, handler, delegationFunction) {
addHandler(element, event, handler, delegationFunction, false)
},
one(element, event, handler, delegationFunction) {
addHandler(element, event, handler, delegationFunction, true)
},
off(element, originalTypeEvent, handler, delegationFunction) {
if (typeof originalTypeEvent !== 'string' || !element) {
return
}
const [isDelegated, callable, typeEvent] = normalizeParameters(originalTypeEvent, handler, delegationFunction)
const inNamespace = typeEvent !== originalTypeEvent
const events = getElementEvents(element)
const storeElementEvent = events[typeEvent] || {}
const isNamespace = originalTypeEvent.startsWith('.')
if (typeof callable !== 'undefined') {
// Simplest case: handler is passed, remove that listener ONLY.
if (!Object.keys(storeElementEvent).length) {
return
}
removeHandler(element, events, typeEvent, callable, isDelegated ? handler : null)
return
}
if (isNamespace) {
for (const elementEvent of Object.keys(events)) {
removeNamespacedHandlers(element, events, elementEvent, originalTypeEvent.slice(1))
}
}
for (const keyHandlers of Object.keys(storeElementEvent)) {
const handlerKey = keyHandlers.replace(stripUidRegex, '')
if (!inNamespace || originalTypeEvent.includes(handlerKey)) {
const event = storeElementEvent[keyHandlers]
removeHandler(element, events, typeEvent, event.callable, event.delegationSelector)
}
}
},
trigger(element, event, args) {
Iif (typeof event !== 'string' || !element) {
return null
}
const $ = getjQuery()
const typeEvent = getTypeEvent(event)
const inNamespace = event !== typeEvent
let jQueryEvent = null
let bubbles = true
let nativeDispatch = true
let defaultPrevented = false
Iif (inNamespace && $) {
jQueryEvent = $.Event(event, args)
$(element).trigger(jQueryEvent)
bubbles = !jQueryEvent.isPropagationStopped()
nativeDispatch = !jQueryEvent.isImmediatePropagationStopped()
defaultPrevented = jQueryEvent.isDefaultPrevented()
}
let evt = new Event(event, { bubbles, cancelable: true })
evt = hydrateObj(evt, args)
Iif (defaultPrevented) {
evt.preventDefault()
}
Eif (nativeDispatch) {
element.dispatchEvent(evt)
}
Iif (evt.defaultPrevented && jQueryEvent) {
jQueryEvent.preventDefault()
}
return evt
}
}
function hydrateObj(obj, meta) {
for (const [key, value] of Object.entries(meta || {})) {
try {
obj[key] = value
} catch {
Object.defineProperty(obj, key, {
configurable: true,
get() {
return value
}
})
}
}
return obj
}
export default EventHandler
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