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Filename : event-handler.js
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/**
 * --------------------------------------------------------------------------
 * Bootstrap (v5.0.0-beta2): 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 getUidEvent(element, uid) {
    return (uid && `${uid}::${uidEvent++}`) || element.uidEvent || uidEvent++
}

function getEvent(element) {
    const uid = getUidEvent(element)

    element.uidEvent = uid
    eventRegistry[uid] = eventRegistry[uid] || {}

    return eventRegistry[uid]
}

function bootstrapHandler(element, fn) {
    return function handler(event) {
        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 (let i = domElements.length; i--;) {
                if (domElements[i] === target) {
                    event.delegateTarget = target

                    if (handler.oneOff) {
                        // eslint-disable-next-line unicorn/consistent-destructuring
                        EventHandler.off(element, event.type, fn)
                    }

                    return fn.apply(target, [event])
                }
            }
        }

        // To please ESLint
        return null
    }
}

function findHandler(events, handler, delegationSelector = null) {
    const uidEventList = Object.keys(events)

    for (let i = 0, len = uidEventList.length; i < len; i++) {
        const event = events[uidEventList[i]]

        if (event.originalHandler === handler && event.delegationSelector === delegationSelector) {
            return event
        }
    }

    return null
}

function normalizeParams(originalTypeEvent, handler, delegationFn) {
    const delegation = typeof handler === 'string'
    const originalHandler = delegation ? delegationFn : handler

    // allow to get the native events from namespaced events ('click.bs.button' --> 'click')
    let typeEvent = originalTypeEvent.replace(stripNameRegex, '')
    const custom = customEvents[typeEvent]

    if (custom) {
        typeEvent = custom
    }

    const isNative = nativeEvents.has(typeEvent)

    if (!isNative) {
        typeEvent = originalTypeEvent
    }

    return [delegation, originalHandler, typeEvent]
}

function addHandler(element, originalTypeEvent, handler, delegationFn, oneOff) {
    if (typeof originalTypeEvent !== 'string' || !element) {
        return
    }

    if (!handler) {
        handler = delegationFn
        delegationFn = null
    }

    const [delegation, originalHandler, typeEvent] = normalizeParams(originalTypeEvent, handler, delegationFn)
    const events = getEvent(element)
    const handlers = events[typeEvent] || (events[typeEvent] = {})
    const previousFn = findHandler(handlers, originalHandler, delegation ? handler : null)

    if (previousFn) {
        previousFn.oneOff = previousFn.oneOff && oneOff

        return
    }

    const uid = getUidEvent(originalHandler, originalTypeEvent.replace(namespaceRegex, ''))
    const fn = delegation ?
        bootstrapDelegationHandler(element, handler, delegationFn) :
        bootstrapHandler(element, handler)

    fn.delegationSelector = delegation ? handler : null
    fn.originalHandler = originalHandler
    fn.oneOff = oneOff
    fn.uidEvent = uid
    handlers[uid] = fn

    element.addEventListener(typeEvent, fn, delegation)
}

function removeHandler(element, events, typeEvent, handler, delegationSelector) {
    const fn = findHandler(events[typeEvent], handler, delegationSelector)

    if (!fn) {
        return
    }

    element.removeEventListener(typeEvent, fn, Boolean(delegationSelector))
    delete events[typeEvent][fn.uidEvent]
}

function removeNamespacedHandlers(element, events, typeEvent, namespace) {
    const storeElementEvent = events[typeEvent] || {}

    Object.keys(storeElementEvent).forEach(handlerKey => {
        if (handlerKey.includes(namespace)) {
            const event = storeElementEvent[handlerKey]

            removeHandler(element, events, typeEvent, event.originalHandler, event.delegationSelector)
        }
    })
}

const EventHandler = {
    on(element, event, handler, delegationFn) {
        addHandler(element, event, handler, delegationFn, false)
    },

    one(element, event, handler, delegationFn) {
        addHandler(element, event, handler, delegationFn, true)
    },

    off(element, originalTypeEvent, handler, delegationFn) {
        if (typeof originalTypeEvent !== 'string' || !element) {
            return
        }

        const [delegation, originalHandler, typeEvent] = normalizeParams(originalTypeEvent, handler, delegationFn)
        const inNamespace = typeEvent !== originalTypeEvent
        const events = getEvent(element)
        const isNamespace = originalTypeEvent.startsWith('.')

        if (typeof originalHandler !== 'undefined') {
            // Simplest case: handler is passed, remove that listener ONLY.
            if (!events || !events[typeEvent]) {
                return
            }

            removeHandler(element, events, typeEvent, originalHandler, delegation ? handler : null)
            return
        }

        if (isNamespace) {
            Object.keys(events).forEach(elementEvent => {
                removeNamespacedHandlers(element, events, elementEvent, originalTypeEvent.slice(1))
            })
        }

        const storeElementEvent = events[typeEvent] || {}
        Object.keys(storeElementEvent).forEach(keyHandlers => {
            const handlerKey = keyHandlers.replace(stripUidRegex, '')

            if (!inNamespace || originalTypeEvent.includes(handlerKey)) {
                const event = storeElementEvent[keyHandlers]

                removeHandler(element, events, typeEvent, event.originalHandler, event.delegationSelector)
            }
        })
    },

    trigger(element, event, args) {
        if (typeof event !== 'string' || !element) {
            return null
        }

        const $ = getjQuery()
        const typeEvent = event.replace(stripNameRegex, '')
        const inNamespace = event !== typeEvent
        const isNative = nativeEvents.has(typeEvent)

        let jQueryEvent
        let bubbles = true
        let nativeDispatch = true
        let defaultPrevented = false
        let evt = null

        if (inNamespace && $) {
            jQueryEvent = $.Event(event, args)

            $(element).trigger(jQueryEvent)
            bubbles = !jQueryEvent.isPropagationStopped()
            nativeDispatch = !jQueryEvent.isImmediatePropagationStopped()
            defaultPrevented = jQueryEvent.isDefaultPrevented()
        }

        if (isNative) {
            evt = document.createEvent('HTMLEvents')
            evt.initEvent(typeEvent, bubbles, true)
        } else {
            evt = new CustomEvent(event, {
                bubbles,
                cancelable: true
            })
        }

        // merge custom information in our event
        if (typeof args !== 'undefined') {
            Object.keys(args).forEach(key => {
                Object.defineProperty(evt, key, {
                    get() {
                        return args[key]
                    }
                })
            })
        }

        if (defaultPrevented) {
            evt.preventDefault()
        }

        if (nativeDispatch) {
            element.dispatchEvent(evt)
        }

        if (evt.defaultPrevented && typeof jQueryEvent !== 'undefined') {
            jQueryEvent.preventDefault()
        }

        return evt
    }
}

export default EventHandler