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Extract Carousel's swipe functionality to a separate Class (#32999)
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| Original file line number | Diff line number | Diff line change |
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@@ -54,7 +54,7 @@ | |
| }, | ||
| { | ||
| "path": "./dist/js/bootstrap.min.js", | ||
| "maxSize": "16 kB" | ||
| "maxSize": "16.25 kB" | ||
| } | ||
| ], | ||
| "ci": { | ||
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,122 @@ | ||
| import EventHandler from '../dom/event-handler' | ||
| import { execute, typeCheckConfig } from './index' | ||
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| 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 NAME = 'swipe' | ||
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| const Default = { | ||
| leftCallback: null, | ||
| rightCallback: null, | ||
| endCallback: null | ||
| } | ||
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| const DefaultType = { | ||
| leftCallback: '(function|null)', | ||
| rightCallback: '(function|null)', | ||
| endCallback: '(function|null)' | ||
| } | ||
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| class Swipe { | ||
| constructor(element, config) { | ||
| this._element = element | ||
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| if (!element || !Swipe.isSupported()) { | ||
| return | ||
| } | ||
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| this._config = this._getConfig(config) | ||
| this._deltaX = 0 | ||
| this._supportPointerEvents = Boolean(window.PointerEvent) | ||
| this._initEvents() | ||
| } | ||
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| dispose() { | ||
| EventHandler.off(this._element, EVENT_KEY) | ||
| } | ||
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| _start(event) { | ||
| if (!this._supportPointerEvents) { | ||
| this._deltaX = event.touches[0].clientX | ||
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| return | ||
| } | ||
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| if (this._eventIsPointerPenTouch(event)) { | ||
| this._deltaX = event.clientX | ||
| } | ||
| } | ||
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| _end(event) { | ||
| if (this._eventIsPointerPenTouch(event)) { | ||
| this._deltaX = event.clientX - this._deltaX | ||
| } | ||
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| this._handleSwipe() | ||
| execute(this._config.endCallback) | ||
| } | ||
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| _move(event) { | ||
| this._deltaX = event.touches && event.touches.length > 1 ? | ||
| 0 : | ||
| event.touches[0].clientX - this._deltaX | ||
| } | ||
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| _handleSwipe() { | ||
| const absDeltaX = Math.abs(this._deltaX) | ||
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| if (absDeltaX <= SWIPE_THRESHOLD) { | ||
| return | ||
| } | ||
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| const direction = absDeltaX / this._deltaX | ||
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| this._deltaX = 0 | ||
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| if (!direction) { | ||
| return | ||
| } | ||
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| execute(direction > 0 ? this._config.rightCallback : this._config.leftCallback) | ||
| } | ||
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| _initEvents() { | ||
| if (this._supportPointerEvents) { | ||
| EventHandler.on(this._element, EVENT_POINTERDOWN, event => this._start(event)) | ||
| EventHandler.on(this._element, EVENT_POINTERUP, event => this._end(event)) | ||
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| 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)) | ||
| } | ||
| } | ||
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| _getConfig(config) { | ||
| config = { | ||
| ...Default, | ||
| ...(typeof config === 'object' ? config : {}) | ||
| } | ||
| typeCheckConfig(NAME, config, DefaultType) | ||
| return config | ||
| } | ||
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| _eventIsPointerPenTouch(event) { | ||
| return this._supportPointerEvents && (event.pointerType === POINTER_TYPE_PEN || event.pointerType === POINTER_TYPE_TOUCH) | ||
| } | ||
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| static isSupported() { | ||
| return 'ontouchstart' in document.documentElement || navigator.maxTouchPoints > 0 | ||
| } | ||
| } | ||
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| export default Swipe |
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