2021-01-23 11:50:39 +00:00
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import { useEffect, useRef, useState, useCallback } from 'react'
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import Hammer from 'hammerjs'
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import Hamster from 'hamsterjs'
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function updateRange(imageWidth, imageHeight, imageScale, containerWidth, containerHeight) {
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const rangeX = Math.max(0, (imageWidth * imageScale) - containerWidth)
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const rangeY = Math.max(0, (imageHeight * imageScale) - containerHeight)
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const rangeMaxX = (rangeX / 2)
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const rangeMinX = 0 - rangeMaxX
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const rangeMaxY = (rangeY / 2)
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const rangeMinY = 0 - rangeMaxY
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return {
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rangeMaxX,
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rangeMinX,
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rangeMaxY,
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rangeMinY,
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}
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}
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function clamp(value, min, max) {
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return Math.min(Math.max(min, value), max)
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}
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let minScale = 1;
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let maxScale = 8;
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function Editor({ onChange, background, backgroundRatio, foreground }) {
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const editorRef = useRef(null)
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const backgroundImageRef = useRef(null)
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const [hammer_got_init, set_hammer_got_init] = useState(false)
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const [hammertime, set_hammertime] = useState(null)
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const [hamster, set_hamster] = useState(null)
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const [x, set_x] = useState(0)
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const [y, set_y] = useState(0)
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const [add_x, set_add_x] = useState(0)
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const [add_y, set_add_y] = useState(0)
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const [scale, set_scale] = useState(1)
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// const [add_scale, set_add_scale] = useState(0)
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const [photoWidth, setPhotoWidth] = useState(300)
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const [photoHeight, setPhotoHeight] = useState(300)
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const [editorWidth, setEditorWidth] = useState(300)
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const [editorHeight, setEditorHeight] = useState(300)
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const [rangeMinX, set_rangeMinX] = useState(0)
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const [rangeMinY, set_rangeMinY] = useState(0)
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const [rangeMaxX, set_rangeMaxX] = useState(0)
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const [rangeMaxY, set_rangeMaxY] = useState(0)
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useEffect(() => {
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if (!!onChange) {
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onChange({ x, y, scale})
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}
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}, [onChange, x, y, scale])
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useEffect(() => {
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if (!!editorRef && !!editorRef.current) {
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const new_editorWidth = editorRef.current.offsetWidth
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const new_editorHeight = editorRef.current.offsetHeight
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setEditorHeight(new_editorHeight)
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setEditorWidth(new_editorWidth)
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let new_photoWidth = 1
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let new_photoHeight = 1
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if (backgroundRatio < 1) {
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new_photoWidth = 1 / backgroundRatio
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} else if (backgroundRatio > 1) {
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new_photoHeight = 1 * backgroundRatio
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}
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setPhotoWidth(new_photoWidth)
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setPhotoHeight(new_photoHeight)
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}
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}, [
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backgroundRatio,
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foreground,
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])
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useEffect(() => {
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const {
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rangeMinX,
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rangeMinY,
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rangeMaxX,
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rangeMaxY,
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} = updateRange(photoWidth * editorWidth, photoHeight * editorHeight, scale, editorWidth, editorHeight)
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set_rangeMinX(rangeMinX)
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set_rangeMinY(rangeMinY)
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set_rangeMaxX(rangeMaxX)
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set_rangeMaxY(rangeMaxY)
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}, [
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photoWidth,
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photoHeight,
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editorWidth,
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editorHeight,
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scale,
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])
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useEffect(() => {
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set_x(0)
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set_y(0)
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set_add_x(0)
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set_add_y(0)
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set_scale(1)
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}, [background])
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const handleMove = useCallback(event => {
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const prev_x = event.target.dataset.x * 1
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const prev_y = event.target.dataset.y * 1
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const new_x = clamp(prev_x + event.deltaX, rangeMinX, rangeMaxX)
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const new_y = clamp(prev_y + event.deltaY, rangeMinY, rangeMaxY)
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if (event.isFinal) {
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set_x(new_x || 0)
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set_y(new_y || 0)
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set_add_x(0)
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set_add_y(0)
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}else{
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set_add_x(new_x - prev_x || 0)
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set_add_y(new_y - prev_y || 0)
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}
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}, [
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rangeMinX,
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rangeMinY,
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rangeMaxX,
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rangeMaxY,
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])
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const handleScale = useCallback((event, delta, deltaX, deltaY) => {
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event.preventDefault()
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const prev_scale = event.target.dataset.scale * 1
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const new_scale = clamp(prev_scale + delta / 200, minScale, maxScale)
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set_scale(new_scale || 1)
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const prev_x = event.target.dataset.x * 1
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const prev_y = event.target.dataset.y * 1
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set_x(clamp(prev_x, rangeMinX, rangeMaxX) || 0)
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set_y(clamp(prev_y, rangeMinY, rangeMaxY) || 0)
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}, [
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rangeMinX,
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rangeMinY,
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rangeMaxX,
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rangeMaxY,
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])
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useEffect(() => {
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if (!hammer_got_init && !!editorRef && !!editorRef.current) {
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const element = editorRef.current
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2021-01-23 12:48:24 +00:00
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element.addEventListener('mousedown', event => {
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event.preventDefault()
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// event.stopPropagation()
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}, false)
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element.addEventListener("touchstart", event => {
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event.preventDefault()
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// event.stopPropagation()
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}, false)
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element.addEventListener("touchend", event => {
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event.preventDefault()
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// event.stopPropagation()
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}, false)
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element.addEventListener("touchmove", event => {
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event.preventDefault()
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// event.stopPropagation()
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}, false)
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2021-01-23 11:50:39 +00:00
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set_hammertime(new Hammer(element, {
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direction: 'DIRECTION_ALL',
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}))
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set_hamster(Hamster(element))
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set_hammer_got_init(true)
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}
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}, [editorRef, hammer_got_init])
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useEffect(() => {
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if (!!hammertime && !!hamster && hammer_got_init && !!editorRef && !!editorRef.current) {
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hammertime.on('pan', handleMove)
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hamster.wheel(handleScale)
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return function () {
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hammertime.off('pan', handleMove)
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hamster.unwheel()
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}
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}
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}, [editorRef, handleMove, handleScale, hammer_got_init, hammertime, hamster])
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return (
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<div
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className="Editor"
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ref={editorRef}
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data-x={x}
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data-y={y}
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data-scale={scale}
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>
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<img
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src={background}
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ref={backgroundImageRef}
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alt=""
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className="background"
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style={{
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width: (photoWidth*100)+'%',
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height: (photoHeight*100)+'%',
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transform: `translate3d(calc(-50% + ${x + add_x}px), calc(-50% + ${y + add_y}px), 0) scale(${scale},${scale})`,
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}}
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/>
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<img
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src={foreground}
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alt=""
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className="foreground"
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/>
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</div>
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)
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}
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export default Editor
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