| /** |
| * -------------------------------------------------------------------------- |
| * Bootstrap (v5.2.1): util/swipe.js |
| * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE) |
| * -------------------------------------------------------------------------- |
| */ |
| |
| import Config from './config' |
| import EventHandler from '../dom/event-handler' |
| import { execute } from './index' |
| |
| /** |
| * 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() |
| 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 |
| } |
| |
| 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 |
| } |
| } |
| |
| export default Swipe |