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import EventHandler from '../dom/event-handler'
import { execute, typeCheckConfig } from './index'
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 = {
leftCallback: null,
rightCallback: null,
endCallback: null
}
const DefaultType = {
leftCallback: '(function|null)',
rightCallback: '(function|null)',
endCallback: '(function|null)'
}
class Swipe {
constructor(element, config) {
this._element = element
if (!element || !Swipe.isSupported()) {
return
}
this._config = this._getConfig(config)
this._deltaX = 0
this._supportPointerEvents = Boolean(window.PointerEvent)
this._initEvents()
}
dispose() {
EventHandler.off(this._element, EVENT_KEY)
}
_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))
}
}
_getConfig(config) {
config = {
...Default,
...(typeof config === 'object' ? config : {})
}
typeCheckConfig(NAME, config, DefaultType)
return config
}
_eventIsPointerPenTouch(event) {
return this._supportPointerEvents && (event.pointerType === POINTER_TYPE_PEN || event.pointerType === POINTER_TYPE_TOUCH)
}
static isSupported() {
return 'ontouchstart' in document.documentElement || navigator.maxTouchPoints > 0
}
}
export default Swipe
|
