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/**
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* --------------------------------------------------------------------------
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* Bootstrap util/swipe.js
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* Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
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* --------------------------------------------------------------------------
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*/
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import EventHandler from '../dom/event-handler'
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import Config from './config'
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import { execute } from './index'
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/**
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* Constants
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*/
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const NAME = 'swipe'
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const EVENT_KEY = '.bs.swipe'
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const EVENT_TOUCHSTART = `touchstart${EVENT_KEY}`
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const EVENT_TOUCHMOVE = `touchmove${EVENT_KEY}`
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const EVENT_TOUCHEND = `touchend${EVENT_KEY}`
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const EVENT_POINTERDOWN = `pointerdown${EVENT_KEY}`
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const EVENT_POINTERUP = `pointerup${EVENT_KEY}`
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const POINTER_TYPE_TOUCH = 'touch'
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const POINTER_TYPE_PEN = 'pen'
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const CLASS_NAME_POINTER_EVENT = 'pointer-event'
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const SWIPE_THRESHOLD = 40
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const Default = {
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endCallback: null,
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leftCallback: null,
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rightCallback: null
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}
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const DefaultType = {
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endCallback: '(function|null)',
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leftCallback: '(function|null)',
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rightCallback: '(function|null)'
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}
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/**
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* Class definition
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*/
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class Swipe extends Config {
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constructor(element, config) {
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super()
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this._element = element
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if (!element || !Swipe.isSupported()) {
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return
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}
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this._config = this._getConfig(config)
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this._deltaX = 0
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this._supportPointerEvents = Boolean(window.PointerEvent)
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this._initEvents()
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}
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// Getters
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static get Default() {
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return Default
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}
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static get DefaultType() {
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return DefaultType
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}
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static get NAME() {
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return NAME
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}
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// Public
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dispose() {
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EventHandler.off(this._element, EVENT_KEY)
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}
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// Private
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_start(event) {
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if (!this._supportPointerEvents) {
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this._deltaX = event.touches[0].clientX
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return
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}
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if (this._eventIsPointerPenTouch(event)) {
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this._deltaX = event.clientX
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}
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}
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_end(event) {
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if (this._eventIsPointerPenTouch(event)) {
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this._deltaX = event.clientX - this._deltaX
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}
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this._handleSwipe()
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execute(this._config.endCallback)
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}
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_move(event) {
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this._deltaX = event.touches && event.touches.length > 1 ?
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event.touches[0].clientX - this._deltaX
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}
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_handleSwipe() {
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const absDeltaX = Math.abs(this._deltaX)
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if (absDeltaX <= SWIPE_THRESHOLD) {
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return
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}
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const direction = absDeltaX / this._deltaX
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this._deltaX = 0
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if (!direction) {
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return
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}
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execute(direction > 0 ? this._config.rightCallback : this._config.leftCallback)
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}
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_initEvents() {
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if (this._supportPointerEvents) {
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EventHandler.on(this._element, EVENT_POINTERDOWN, event => this._start(event))
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EventHandler.on(this._element, EVENT_POINTERUP, event => this._end(event))
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this._element.classList.add(CLASS_NAME_POINTER_EVENT)
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} else {
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EventHandler.on(this._element, EVENT_TOUCHSTART, event => this._start(event))
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EventHandler.on(this._element, EVENT_TOUCHMOVE, event => this._move(event))
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EventHandler.on(this._element, EVENT_TOUCHEND, event => this._end(event))
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}
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}
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_eventIsPointerPenTouch(event) {
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return this._supportPointerEvents && (event.pointerType === POINTER_TYPE_PEN || event.pointerType === POINTER_TYPE_TOUCH)
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}
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// Static
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static isSupported() {
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return 'ontouchstart' in document.documentElement || navigator.maxTouchPoints > 0
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}
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}
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export default Swipe
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