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February 5, 2021 10:58
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Simple Swipe control util class with ts
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export interface TouchEventExt extends TouchEvent { | |
center: { | |
x: number; | |
y: number; | |
}; | |
} | |
class Swipe { | |
element: HTMLElement; | |
lastTouchEvent: TouchEventExt; | |
prevTouchEvent: TouchEventExt; | |
y: number; | |
x: number; | |
xDiff: number; | |
yDiff: number; | |
events: { [key: string]: Function[] }; | |
constructor(element: HTMLElement) { | |
this.events = {}; | |
this.x = null; | |
this.y = null; | |
this.prevTouchEvent = null; | |
this.lastTouchEvent = null; | |
this.element = element; | |
this._handleTouchStart = this._handleTouchStart.bind(this); | |
this._handleTouchMove = this._handleTouchMove.bind(this); | |
this._handleTouchEnd = this._handleTouchEnd.bind(this); | |
this._listenStart(); | |
} | |
static indexOf(store: Function[], target: Function) { | |
if (typeof Array.prototype.indexOf === 'function') { | |
return store.indexOf(target); | |
} | |
let i = 0; | |
const { length } = store; | |
let idx = -1; | |
let found = false; | |
while (i < length && !found) { | |
if (store[i] === target) { | |
idx = i; | |
found = true; | |
} | |
i += 1; | |
} | |
return idx; | |
} | |
_listenStart() { | |
if (!this.element) return; | |
this.element.addEventListener('touchstart', this._handleTouchStart); | |
} | |
_listenMove() { | |
if (!this.element) return; | |
this.element.addEventListener('touchmove', this._handleTouchMove); | |
} | |
_listenEnd() { | |
if (!this.element) return; | |
this.element.addEventListener('touchend', this._handleTouchEnd); | |
} | |
_handleTouchEnd() { | |
this.emit('end', this.lastTouchEvent); | |
this.element.removeEventListener('touchmove', this._handleTouchMove); | |
this.element.removeEventListener('touchend', this._handleTouchEnd); | |
} | |
_handleTouchStart(evt: TouchEvent) { | |
this.x = evt.touches[0].clientX; | |
this.y = evt.touches[0].clientY; | |
const { x, y } = this; | |
this.prevTouchEvent = Object.assign(evt, { center: { x, y } }); | |
this.lastTouchEvent = this.prevTouchEvent; | |
this.emit('start', this.lastTouchEvent); | |
this._listenMove(); | |
this._listenEnd(); | |
} | |
_handleTouchMove(evt: TouchEvent) { | |
if (!this.x || !this.y) { | |
return; | |
} | |
const xNew = evt.touches[0].clientX; | |
const yNew = evt.touches[0].clientY; | |
const event = Object.assign(evt, { center: { x: xNew, y: yNew } }); | |
this.prevTouchEvent = this.lastTouchEvent; | |
this.lastTouchEvent = event; | |
this.emit('move', event); | |
this.xDiff = this.x - xNew; | |
this.yDiff = this.y - yNew; | |
if (Math.abs(this.xDiff) > Math.abs(this.yDiff)) { | |
// Most significant. | |
if (this.xDiff > 0) { | |
this.emit('left', event); | |
} else { | |
this.emit('right', event); | |
} | |
} else if (this.yDiff > 0) { | |
this.emit('up', event); | |
} else { | |
this.emit('down', event); | |
} | |
// Reset values. | |
this.x = xNew; | |
this.y = yNew; | |
} | |
destroy() { | |
this.element.removeEventListener('touchstart', this._handleTouchStart); | |
this.element.removeEventListener('touchmove', this._handleTouchMove); | |
this.element.removeEventListener('touchend', this._handleTouchEnd); | |
} | |
on(event: string, listener: Function) { | |
if (typeof this.events[event] !== 'object') { | |
this.events[event] = []; | |
} | |
this.events[event].push(listener); | |
} | |
emit(event: string, args?: TouchEventExt) { | |
if (typeof this.events[event] === 'object') { | |
const listeners = this.events[event].slice(); | |
const { length } = listeners; | |
for (let i = 0; i < length; i += 1) { | |
const fn = listeners[i]; | |
fn(args); | |
} | |
} | |
} | |
removeListener(event: string, listener: Function) { | |
if (typeof this.events[event] === 'object') { | |
const idx = Swipe.indexOf(this.events[event], listener); | |
if (idx > -1) { | |
this.events[event].splice(idx, 1); | |
} | |
} | |
} | |
removeAllListener() { | |
this.events = {}; | |
} | |
} | |
export default Swipe; |
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