# All files / src/dom event-handler.js

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     /**
     * --------------------------------------------------------------------------
     * Bootstrap (v5.0.0-alpha1): dom/event-handler.js
     * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
     * --------------------------------------------------------------------------
     */

    import { getjQuery } from '../util/index'
    import { defaultPreventedPreservedOnDispatch } from './polyfill'

    /**
     * ------------------------------------------------------------------------
     * Constants
     * ------------------------------------------------------------------------
     */

    const $ = getjQuery()
    const namespaceRegex = /[^.]*(?=\..*)\.|.*/
    const stripNameRegex = /\..*/
    const stripUidRegex = /::\d+$/
    const eventRegistry = {} // Events storage
    let uidEvent = 1
    const customEvents = {
      mouseenter: 'mouseover',
      mouseleave: 'mouseout'
    }
    const nativeEvents = [
      '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

              Iif (handler.oneOff) {
                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.indexOf(typeEvent) > -1

      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)

      Iif (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.indexOf(namespace) > -1) {
          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.charAt(0) === '.'

        if (typeof originalHandler !== 'undefined') {
          // Simplest case: handler is passed, remove that listener ONLY.
          Iif (!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.indexOf(handlerKey) > -1) {
            const event = storeElementEvent[keyHandlers]

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

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

        const typeEvent = event.replace(stripNameRegex, '')
        const inNamespace = event !== typeEvent
        const isNative = nativeEvents.indexOf(typeEvent) > -1

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

        Iif (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]
              }
            })
          })
        }

        Iif (defaultPrevented) {
          evt.preventDefault()

          if (!defaultPreventedPreservedOnDispatch) {
            Object.defineProperty(evt, 'defaultPrevented', {
              get: () => true
            })
          }
        }

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

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

        return evt
      }
    }

    export default EventHandler