Bootstrap/js/dist/util/swipe.js

/*!
  * Bootstrap swipe.js v5.3.0-alpha1 (https://getbootstrap.com/)
  * Copyright 2011-2022 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(require('./config.js'), require('../dom/event-handler.js'), require('./index.js')) :
  typeof define === 'function' && define.amd ? define(['./config', '../dom/event-handler', './index'], factory) :
  (global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.Swipe = factory(global.Config, global.EventHandler, global.Index));
})(this, (function (Config, EventHandler, index_js) { 'use strict';

  /**
   * --------------------------------------------------------------------------
   * Bootstrap (v5.3.0-alpha1): util/swipe.js
   * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
   * --------------------------------------------------------------------------
   */

  /**
   * Constants
   */

  const NAME = 'swipe';
  const EVENT_KEY = '.bs.swipe';
  const EVENT_TOUCHSTART = `touchstart${EVENT_KEY}`;
  const EVENT_TOUCHMOVE = `touchmove${EVENT_KEY}`;
  const EVENT_TOUCHEND = `touchend${EVENT_KEY}`;
  const EVENT_POINTERDOWN = `pointerdown${EVENT_KEY}`;
  const EVENT_POINTERUP = `pointerup${EVENT_KEY}`;
  const POINTER_TYPE_TOUCH = 'touch';
  const POINTER_TYPE_PEN = 'pen';
  const CLASS_NAME_POINTER_EVENT = 'pointer-event';
  const SWIPE_THRESHOLD = 40;
  const Default = {
    endCallback: null,
    leftCallback: null,
    rightCallback: null
  };
  const DefaultType = {
    endCallback: '(function|null)',
    leftCallback: '(function|null)',
    rightCallback: '(function|null)'
  };

  /**
   * Class definition
   */

  class Swipe extends Config {
    constructor(element, config) {
      super();
      this._element = element;
      if (!element || !Swipe.isSupported()) {
        return;
      }
      this._config = this._getConfig(config);
      this._deltaX = 0;
      this._supportPointerEvents = Boolean(window.PointerEvent);
      this._initEvents();
    }

    // Getters
    static get Default() {
      return Default;
    }
    static get DefaultType() {
      return DefaultType;
    }
    static get NAME() {
      return NAME;
    }

    // Public
    dispose() {
      EventHandler.off(this._element, EVENT_KEY);
    }

    // Private
    _start(event) {
      if (!this._supportPointerEvents) {
        this._deltaX = event.touches[0].clientX;
        return;
      }
      if (this._eventIsPointerPenTouch(event)) {
        this._deltaX = event.clientX;
      }
    }
    _end(event) {
      if (this._eventIsPointerPenTouch(event)) {
        this._deltaX = event.clientX - this._deltaX;
      }
      this._handleSwipe();
      index_js.execute(this._config.endCallback);
    }
    _move(event) {
      this._deltaX = event.touches && event.touches.length > 1 ? 0 : event.touches[0].clientX - this._deltaX;
    }
    _handleSwipe() {
      const absDeltaX = Math.abs(this._deltaX);
      if (absDeltaX <= SWIPE_THRESHOLD) {
        return;
      }
      const direction = absDeltaX / this._deltaX;
      this._deltaX = 0;
      if (!direction) {
        return;
      }
      index_js.execute(direction > 0 ? this._config.rightCallback : this._config.leftCallback);
    }
    _initEvents() {
      if (this._supportPointerEvents) {
        EventHandler.on(this._element, EVENT_POINTERDOWN, event => this._start(event));
        EventHandler.on(this._element, EVENT_POINTERUP, event => this._end(event));
        this._element.classList.add(CLASS_NAME_POINTER_EVENT);
      } else {
        EventHandler.on(this._element, EVENT_TOUCHSTART, event => this._start(event));
        EventHandler.on(this._element, EVENT_TOUCHMOVE, event => this._move(event));
        EventHandler.on(this._element, EVENT_TOUCHEND, event => this._end(event));
      }
    }
    _eventIsPointerPenTouch(event) {
      return this._supportPointerEvents && (event.pointerType === POINTER_TYPE_PEN || event.pointerType === POINTER_TYPE_TOUCH);
    }

    // Static
    static isSupported() {
      return 'ontouchstart' in document.documentElement || navigator.maxTouchPoints > 0;
    }
  }

  return Swipe;

}));
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