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PointerEvent.js
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PointerEvent.js
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import { clock } from 'source/common/time'
import { getDist } from 'source/common/geometry/D2/Vector'
import { isContainPoint as isBoundingRectContainPoint } from 'source/common/geometry/D2/BoundingRect'
const POINTER_EVENT_TYPE = {
START: 'START',
MOVE: 'MOVE',
END: 'END',
CANCEL: 'CANCEL'
}
// TODO: currently single pointer only
const applyPointerEventListener = ({
element,
onEvent, // (type, event, calcState) => {}
isGlobal = false,
isCancel = true, // send cancel
isCancelOnOutOfBound = true, // send out of bound as cancel
isUseTouchEvent = true // TODO: when touch trigger browser scroll, pointer will be cancelled, so to still get a drag, both Pointer & Touch will be listened
}) => {
!window.getComputedStyle(element).touchAction && console.warn('[applyPointerEventListener] should set CSS "touch-action" to "none" to prevent browser defaults')
const eventSource = isGlobal ? window.document : element
isCancelOnOutOfBound = isCancel && isCancelOnOutOfBound
// TODO: add custom function to record start state
let timeStart
let pointStart // relative to client/viewport
let eventStart
let prevEvent // basic memorize
let prevState // basic memorize
const reset = () => {
timeStart = null
pointStart = null
eventStart = null
prevEvent = null
prevState = null
eventSource.removeEventListener('pointermove', onMove)
eventSource.removeEventListener('pointerup', onEnd)
isCancel && eventSource.removeEventListener('pointercancel', onCancel)
isCancelOnOutOfBound && eventSource.removeEventListener('pointerleave', onCancel)
isUseTouchEvent && eventSource.removeEventListener('touchmove', onMove, { passive: false })
isUseTouchEvent && eventSource.removeEventListener('touchend', onEnd)
isUseTouchEvent && isCancel && eventSource.removeEventListener('touchcancel', onCancel)
}
const getEventPointClient = (event) => ({ x: event.clientX, y: event.clientY })
const getEventPointTouch = (event) => {
if (!(event instanceof window.TouchEvent)) return { x: event.clientX, y: event.clientY }
return event.touches.length
? { x: event.touches[ 0 ].clientX, y: event.touches[ 0 ].clientY }
: { x: event.changedTouches[ 0 ].clientX, y: event.changedTouches[ 0 ].clientY }
}
const getEventPoint = (!isUseTouchEvent || !window.TouchEvent)
? getEventPointClient
: getEventPointTouch
const calcState = (event) => {
if (__DEV__ && !timeStart) throw new Error(`[calcState] expect timeStart, get event: ${event.type}`)
if (__DEV__ && !event) throw new Error('[calcState] expect event')
if (event !== prevEvent) {
const time = clock()
const point = getEventPoint(event)
prevEvent = event
prevState = {
timeStart,
pointStart,
eventStart,
time,
point,
event,
duration: time - timeStart,
distance: getDist(pointStart, point)
}
}
return prevState
}
const checkShouldPass = (!isUseTouchEvent || !window.TouchEvent)
? (event) => !event.isPrimary
: (event) => (event instanceof window.TouchEvent)
? (
(event.type === 'touchend' || event.type === 'touchcancel')
? event.touches.length !== 0
: event.touches.length !== 1
)
: (!event.isPrimary || event.pointerType === 'touch')
const onStart = (event) => {
if (checkShouldPass(event)) return
timeStart = clock()
pointStart = getEventPoint(event)
eventStart = event
eventSource.addEventListener('pointermove', onMove)
eventSource.addEventListener('pointerup', onEnd)
isCancel && eventSource.addEventListener('pointercancel', onCancel)
isCancelOnOutOfBound && eventSource.addEventListener('pointerleave', onCancel)
isUseTouchEvent && eventSource.addEventListener('touchmove', onMove, { passive: false })
isUseTouchEvent && eventSource.addEventListener('touchend', onEnd)
isUseTouchEvent && isCancel && eventSource.addEventListener('touchcancel', onCancel)
onEvent(POINTER_EVENT_TYPE.START, event, calcState)
}
const onMove = (event) => {
if (checkShouldPass(event)) return
const { point } = calcState(event)
if (
isCancelOnOutOfBound &&
!isBoundingRectContainPoint(element.getBoundingClientRect(), point)
) return onCancel(event)
onEvent(POINTER_EVENT_TYPE.MOVE, event, calcState)
}
const onEnd = (event) => {
if (checkShouldPass(event)) return
onEvent(POINTER_EVENT_TYPE.END, event, calcState)
reset()
}
const onCancel = (event) => {
if (checkShouldPass(event)) return
onEvent(POINTER_EVENT_TYPE.CANCEL, event, calcState)
reset()
}
element.addEventListener('pointerdown', onStart)
isUseTouchEvent && element.addEventListener('touchstart', onStart, { passive: false })
reset()
return () => {
element.removeEventListener('pointerdown', onStart)
isUseTouchEvent && element.removeEventListener('touchstart', onStart, { passive: false })
reset()
}
}
const ENHANCED_POINTER_EVENT_TYPE = {
TAP: 'TAP',
HOLD: 'HOLD',
DRAG_MOVE: 'DRAG_MOVE',
DRAG_END: 'DRAG_END',
DRAG_CANCEL: 'DRAG_CANCEL'
}
const applyEnhancedPointerEventListener = ({
onEnhancedEvent, // (type, eventState) => {}
onEvent, // (type, event, calcState) => {}, optional, for original PointerEvent
holdDurationThreshold = 500, // in msec
dragDistanceThreshold = 5, // in px
...extraOption
}) => {
let isDragging = false
const enhancedOnEvent = (name, event, calcState) => {
const eventState = calcState(event)
switch (name) {
case POINTER_EVENT_TYPE.START:
isDragging = false
break
case POINTER_EVENT_TYPE.MOVE:
isDragging |= eventState.distance >= dragDistanceThreshold
if (isDragging) onEnhancedEvent(ENHANCED_POINTER_EVENT_TYPE.DRAG_MOVE, eventState)
break
case POINTER_EVENT_TYPE.END:
if (isDragging) onEnhancedEvent(ENHANCED_POINTER_EVENT_TYPE.DRAG_END, eventState)
else if (eventState.duration >= holdDurationThreshold) onEnhancedEvent(ENHANCED_POINTER_EVENT_TYPE.HOLD, eventState)
else onEnhancedEvent(ENHANCED_POINTER_EVENT_TYPE.TAP, eventState)
break
case POINTER_EVENT_TYPE.CANCEL:
if (isDragging) onEnhancedEvent(ENHANCED_POINTER_EVENT_TYPE.DRAG_CANCEL, eventState)
break
}
onEvent && onEvent(name, event, calcState)
}
return applyPointerEventListener({ onEvent: enhancedOnEvent, ...extraOption })
}
export {
POINTER_EVENT_TYPE,
applyPointerEventListener,
ENHANCED_POINTER_EVENT_TYPE,
applyEnhancedPointerEventListener
}