69 lines
1.7 KiB
TypeScript
69 lines
1.7 KiB
TypeScript
import React, { useEffect, useRef } from "react"
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import state from "state"
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import { getPointerEventInfo } from "utils/utils"
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import * as vec from "utils/vec"
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/**
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* Capture zoom gestures (pinches, wheels and pans) and send to the state.
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* @param ref
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* @returns
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*/
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export default function useZoomEvents(
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ref: React.MutableRefObject<SVGSVGElement>
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) {
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const rTouchDist = useRef(0)
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useEffect(() => {
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const element = ref.current
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if (!element) return
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function handleWheel(e: WheelEvent) {
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e.preventDefault()
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if (e.ctrlKey) {
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state.send("ZOOMED_CAMERA", {
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delta: e.deltaY,
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...getPointerEventInfo(e),
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})
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return
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}
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state.send("PANNED_CAMERA", {
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delta: [e.deltaX, e.deltaY],
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...getPointerEventInfo(e),
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})
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}
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function handleTouchMove(e: TouchEvent) {
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e.preventDefault()
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if (e.touches.length === 2) {
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const { clientX: x0, clientY: y0 } = e.touches[0]
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const { clientX: x1, clientY: y1 } = e.touches[1]
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const dist = vec.dist([x0, y0], [x1, y1])
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const point = vec.med([x0, y0], [x1, y1])
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state.send("WHEELED", {
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delta: dist - rTouchDist.current,
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point,
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})
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rTouchDist.current = dist
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}
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}
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element.addEventListener("wheel", handleWheel)
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element.addEventListener("touchstart", handleTouchMove)
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element.addEventListener("touchmove", handleTouchMove)
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return () => {
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element.removeEventListener("wheel", handleWheel)
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element.removeEventListener("touchstart", handleTouchMove)
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element.removeEventListener("touchmove", handleTouchMove)
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}
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}, [ref])
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return {}
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}
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