Webprogrammierung/node_modules/bootstrap/js/dist/dom/event-handler.js

/*!
  * Bootstrap event-handler.js v5.1.3 (https://getbootstrap.com/)
  * Copyright 2011-2021 The Bootstrap Authors (https://github.com/twbs/bootstrap/graphs/contributors)
  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
  */
(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
  typeof define === 'function' && define.amd ? define(factory) :
  (global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.EventHandler = factory());
})(this, (function () { 'use strict';

  /**
   * --------------------------------------------------------------------------
   * Bootstrap (v5.1.3): util/index.js
   * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
   * --------------------------------------------------------------------------
   */

  const getjQuery = () => {
    const {
      jQuery
    } = window;

    if (jQuery && !document.body.hasAttribute('data-bs-no-jquery')) {
      return jQuery;
    }

    return null;
  };

  /**
   * --------------------------------------------------------------------------
   * Bootstrap (v5.1.3): dom/event-handler.js
   * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
   * --------------------------------------------------------------------------
   */
  /**
   * ------------------------------------------------------------------------
   * Constants
   * ------------------------------------------------------------------------
   */

  const namespaceRegex = /[^.]*(?=\..*)\.|.*/;
  const stripNameRegex = /\..*/;
  const stripUidRegex = /::\d+$/;
  const eventRegistry = {}; // Events storage

  let uidEvent = 1;
  const customEvents = {
    mouseenter: 'mouseover',
    mouseleave: 'mouseout'
  };
  const customEventsRegex = /^(mouseenter|mouseleave)/i;
  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) {
              EventHandler.off(element, event.type, selector, 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;
    let typeEvent = getTypeEvent(originalTypeEvent);
    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;
    } // 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 (customEventsRegex.test(originalTypeEvent)) {
      const wrapFn = fn => {
        return function (event) {
          if (!event.relatedTarget || event.relatedTarget !== event.delegateTarget && !event.delegateTarget.contains(event.relatedTarget)) {
            return fn.call(this, event);
          }
        };
      };

      if (delegationFn) {
        delegationFn = wrapFn(delegationFn);
      } else {
        handler = wrapFn(handler);
      }
    }

    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);
      }
    });
  }

  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, 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 = getTypeEvent(event);
      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;
    }

  };

  return EventHandler;

}));
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