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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,219 @@ | ||
| import { useCallback, useEffect, useRef } from 'react'; | ||
| import type { Transform, TransformAction, TransformType } from './useImageTransform'; | ||
|
|
||
| type Point = { | ||
| x: number; | ||
| y: number; | ||
| }; | ||
| type EventType = 'init' | 'zoom' | 'move'; | ||
|
|
||
| let lastTouchEnd = 0; | ||
| const initPoint = { x: 0, y: 0 }; | ||
|
|
||
| function getDistance(a: Point, b: Point) { | ||
| const x = a.x - b.x; | ||
| const y = a.y - b.y; | ||
| return Math.hypot(x, y); | ||
| } | ||
| function getCenter(a: Point, b: Point) { | ||
| const x = (a.x + b.x) / 2; | ||
| const y = (a.y + b.y) / 2; | ||
| return [x, y]; | ||
| } | ||
|
|
||
| /** Prohibit WeChat sliding & Prohibit browser scaling */ | ||
| function touchstart(event: TouchEvent) { | ||
| if (event.touches.length > 1) { | ||
| event.preventDefault(); | ||
| } | ||
| } | ||
| function touchmove(event: TouchEvent) { | ||
| event.preventDefault(); | ||
| } | ||
| function touchend(event: TouchEvent) { | ||
| const now = Date.now(); | ||
| if (now - lastTouchEnd <= 300) { | ||
| event.preventDefault(); | ||
| } | ||
| lastTouchEnd = now; | ||
| } | ||
| function slidingControl(stop: boolean, className: string) { | ||
| const containerEle = document.getElementsByClassName(className)?.[0] as HTMLElement; | ||
|
|
||
| if (stop) { | ||
| if (containerEle) { | ||
| containerEle.parentElement.addEventListener('touchmove', touchmove, { | ||
| passive: false, | ||
| }); | ||
| containerEle.addEventListener('touchmove', touchmove, { | ||
| passive: false, | ||
| }); | ||
| } | ||
|
|
||
| document.addEventListener('touchstart', touchstart, { | ||
| passive: false, | ||
| }); | ||
| document.addEventListener('touchend', touchend, { | ||
| passive: false, | ||
| }); | ||
| } else { | ||
| if (containerEle) { | ||
| containerEle.parentElement.removeEventListener('touchmove', touchmove); | ||
| containerEle.removeEventListener('touchmove', touchmove); | ||
| } | ||
|
|
||
| document.removeEventListener('touchstart', touchstart); | ||
| document.removeEventListener('touchend', touchend); | ||
| } | ||
| } | ||
|
|
||
| /** Pinch-to-zoom & Move image after zooming in */ | ||
| export default function useTouchZoom( | ||
| updateTransform: (newTransform: Partial<TransformType>, action: TransformAction) => void, | ||
| dispatchZoomChange: ( | ||
| ratio: number, | ||
| action: TransformAction, | ||
| clientX?: number, | ||
| clientY?: number, | ||
| ) => void, | ||
| transform: Transform, | ||
| visible: boolean, | ||
| imgRef: React.MutableRefObject<HTMLImageElement>, | ||
| prefixCls: string, | ||
| ) { | ||
| const { x: translateX, y: translateY, scale } = transform; | ||
| const { width: imgWidth, height: imgHeight } = imgRef.current || { width: 0, height: 0 }; | ||
|
|
||
| const getTranslateLimit = () => { | ||
| const offsetX = (imgWidth * scale - document.documentElement.clientWidth) / 2; | ||
| const offsetY = (imgHeight * scale - document.documentElement.clientHeight) / 2; | ||
| return [offsetX, offsetY]; | ||
| }; | ||
|
|
||
| const getOverflow = () => { | ||
| return [ | ||
| imgWidth * scale > document.documentElement.clientWidth, | ||
| imgHeight * scale > document.documentElement.clientHeight, | ||
| ]; | ||
| }; | ||
|
|
||
| const touchPointInfo = useRef<{ touchOne: Point; touchTwo: Point; eventType: EventType }>({ | ||
| touchOne: { ...initPoint }, | ||
| touchTwo: { ...initPoint }, | ||
| eventType: 'init', | ||
| }); | ||
|
|
||
| const setTouchPoint = useCallback((a: Point, b: Point, eventType: EventType) => { | ||
| touchPointInfo.current.touchOne = a; | ||
| touchPointInfo.current.touchTwo = b; | ||
| touchPointInfo.current.eventType = eventType; | ||
| }, []); | ||
|
|
||
| const restTouchPoint = (event: React.TouchEvent<HTMLImageElement>) => { | ||
| const { touches = [] } = event; | ||
| if (touches.length) return; | ||
|
|
||
| const [offsetX, offsetY] = getTranslateLimit(); | ||
| const [xOverflow, yOverflow] = getOverflow(); | ||
|
|
||
| let newX = translateX; | ||
| let newY = translateY; | ||
|
|
||
| if (xOverflow) { | ||
| if (translateX > offsetX) { | ||
| newX = offsetX; | ||
| } else if (translateX < -offsetX) { | ||
| newX = -offsetX; | ||
| } | ||
| } else { | ||
| newX = 0; | ||
| } | ||
|
|
||
| if (yOverflow) { | ||
| if (translateY > offsetY) { | ||
| newY = offsetY; | ||
| } else if (translateY < -offsetY) { | ||
| newY = -offsetY; | ||
| } | ||
| } else { | ||
| newY = 0; | ||
| } | ||
|
|
||
| setTimeout(() => { | ||
| updateTransform({ x: newX, y: newY }, 'move'); | ||
| }, 100); | ||
|
|
||
| setTouchPoint({ ...initPoint }, { ...initPoint }, 'init'); | ||
| }; | ||
|
|
||
| const onTouchStart = useCallback( | ||
| (event: React.TouchEvent<HTMLImageElement>) => { | ||
| const { touches = [] } = event; | ||
| if (touches.length > 1) { | ||
| // touch zoom | ||
| setTouchPoint( | ||
| { x: touches[0].clientX, y: touches[0].clientY }, | ||
| { x: touches[1].clientX, y: touches[1].clientY }, | ||
| 'zoom', | ||
| ); | ||
| } else { | ||
| // touch move | ||
| setTouchPoint( | ||
| { | ||
| x: touches[0].clientX - transform.x, | ||
| y: touches[0].clientY - transform.y, | ||
| }, | ||
| { ...initPoint }, | ||
| 'move', | ||
| ); | ||
| } | ||
| }, | ||
| [setTouchPoint, transform], | ||
| ); | ||
|
|
||
| const onTouchMove = (event: React.TouchEvent<HTMLImageElement>) => { | ||
| const { touches = [] } = event; | ||
| const { touchOne, touchTwo, eventType } = touchPointInfo.current; | ||
|
|
||
| const oldPoint = { | ||
| a: { x: touchOne.x, y: touchOne.y }, | ||
| b: { x: touchTwo.x, y: touchTwo.y }, | ||
| }; | ||
| const newPoint = { | ||
| a: { x: touches[0]?.clientX, y: touches[0]?.clientY }, | ||
| b: { x: touches[1]?.clientX, y: touches[1]?.clientY }, | ||
| }; | ||
|
|
||
| if (eventType === 'zoom' && touches.length > 1) { | ||
| const [x, y] = getCenter(newPoint.a, newPoint.b); | ||
| const ratio = getDistance(newPoint.a, newPoint.b) / getDistance(oldPoint.a, oldPoint.b); | ||
|
|
||
| dispatchZoomChange(ratio, 'touchZoom', x, y); | ||
| setTouchPoint(newPoint.a, newPoint.b, 'zoom'); | ||
| } else if (eventType === 'move') { | ||
| updateTransform( | ||
| { | ||
| x: newPoint.a.x - oldPoint.a.x, | ||
| y: newPoint.a.y - oldPoint.a.y, | ||
| }, | ||
| 'move', | ||
| ); | ||
| } | ||
| }; | ||
|
|
||
| useEffect(() => { | ||
| if (visible) { | ||
| slidingControl(true, prefixCls + '-mask'); | ||
| } else { | ||
| slidingControl(false, prefixCls + '-mask'); | ||
| } | ||
| }, [visible, prefixCls]); | ||
|
|
||
| return { | ||
| touchPointInfo: touchPointInfo.current, | ||
| onTouchStart, | ||
| onTouchMove, | ||
| onTouchEnd: restTouchPoint, | ||
| onTouchCancel: restTouchPoint, | ||
| }; | ||
| } | ||