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Interactions.tsx
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Interactions.tsx
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import * as React from 'react'
import * as THREE from 'three'
import { useThree, useFrame } from '@react-three/fiber'
import { useXR } from './XR'
import { XRController } from './XRController'
import { useXREvent, XREvent, XRControllerEvent } from './XREvents'
import { useCallbackRef, useIsomorphicLayoutEffect } from './utils'
export interface XRInteractionEvent {
intersection?: THREE.Intersection
intersections: THREE.Intersection[]
target: XRController
}
export type XRInteractionType =
| 'onHover'
| 'onBlur'
| 'onSelect'
| 'onSelectEnd'
| 'onSelectStart'
| 'onSelectMissed'
| 'onSqueeze'
| 'onSqueezeEnd'
| 'onSqueezeStart'
| 'onSqueezeMissed'
| 'onMove'
export type XRInteractionHandler = (event: XRInteractionEvent) => void
const tempMatrix = new THREE.Matrix4()
export function InteractionManager({ children }: { children: React.ReactNode }) {
const events = useThree((state) => state.events)
const get = useThree((state) => state.get)
const raycaster = useThree((state) => state.raycaster)
const controllers = useXR((state) => state.controllers)
const interactions = useXR((state) => state.interactions)
const hoverState = useXR((state) => state.hoverState)
const hasInteraction = useXR((state) => state.hasInteraction)
const getInteraction = useXR((state) => state.getInteraction)
const intersect = React.useCallback(
(controller: THREE.Object3D) => {
const objects = Array.from(interactions.keys())
tempMatrix.identity().extractRotation(controller.matrixWorld)
raycaster.ray.origin.setFromMatrixPosition(controller.matrixWorld)
raycaster.ray.direction.set(0, 0, -1).applyMatrix4(tempMatrix)
return raycaster.intersectObjects(objects, true)
},
[interactions, raycaster]
)
// Trigger hover and blur events
useFrame(() => {
if (interactions.size === 0) return
for (const target of controllers) {
const hovering = hoverState[target.inputSource.handedness]
const hits = new Set()
let intersections = intersect(target.controller)
if (events.filter) {
// https://github.com/mrdoob/three.js/issues/16031
// Allow custom userland intersect sort order
intersections = events.filter(intersections, get())
} else {
// Otherwise, filter to first hit
const hit = intersections.find((i) => i?.object)
if (hit) intersections = [hit]
}
for (const intersection of intersections) {
let eventObject: THREE.Object3D | null = intersection.object
while (eventObject) {
if (hasInteraction(eventObject, 'onHover') && !hovering.has(eventObject)) {
const handlers = getInteraction(eventObject, 'onHover')!
for (const handler of handlers) {
handler({ target, intersection, intersections })
}
}
const moveHandlers = getInteraction(eventObject, 'onMove')
moveHandlers?.forEach((handler) => handler({ target, intersection, intersections }))
hovering.set(eventObject, intersection)
hits.add(eventObject.id)
eventObject = eventObject.parent
}
}
// Trigger blur on all the object that were hovered in the previous frame
// but missed in this one
for (const eventObject of hovering.keys()) {
if (!hits.has(eventObject.id)) {
hovering.delete(eventObject)
const handlers = getInteraction(eventObject, 'onBlur')
if (!handlers) continue
for (const handler of handlers) {
handler({ target, intersections })
}
}
}
}
})
const triggerEvent = React.useCallback(
(interaction: XRInteractionType) => (e: XREvent<XRControllerEvent>) => {
const hovering = hoverState[e.target.inputSource.handedness]
const intersections = Array.from(new Set(hovering.values()))
interactions.forEach((handlers, object) => {
if (hovering.has(object)) {
if (!handlers[interaction]) return
for (const handler of handlers[interaction]) {
handler.current?.({ target: e.target, intersection: hovering.get(object), intersections })
}
} else {
if (interaction === 'onSelect' && handlers['onSelectMissed']) {
for (const handler of handlers['onSelectMissed']) {
handler.current?.({ target: e.target, intersections })
}
} else if (interaction === 'onSqueeze' && handlers['onSqueezeMissed']) {
for (const handler of handlers['onSqueezeMissed']) {
handler.current?.({ target: e.target, intersections })
}
}
}
})
},
[hoverState, interactions]
)
useXREvent('select', triggerEvent('onSelect'))
useXREvent('selectstart', triggerEvent('onSelectStart'))
useXREvent('selectend', triggerEvent('onSelectEnd'))
useXREvent('squeeze', triggerEvent('onSqueeze'))
useXREvent('squeezeend', triggerEvent('onSqueezeEnd'))
useXREvent('squeezestart', triggerEvent('onSqueezeStart'))
return <>{children}</>
}
export function useInteraction(ref: React.RefObject<THREE.Object3D>, type: XRInteractionType, handler?: XRInteractionHandler) {
const addInteraction = useXR((state) => state.addInteraction)
const removeInteraction = useXR((state) => state.removeInteraction)
const handlerRef = useCallbackRef(handler)
useIsomorphicLayoutEffect(() => {
const target = ref.current
if (!target || !handlerRef.current) return
addInteraction(target, type, handlerRef as React.RefObject<XRInteractionHandler>)
return () => removeInteraction(target, type, handlerRef as React.RefObject<XRInteractionHandler>)
}, [ref, type, addInteraction, removeInteraction])
}
export interface InteractiveProps {
onHover?: XRInteractionHandler
onBlur?: XRInteractionHandler
onSelectStart?: XRInteractionHandler
onSelectEnd?: XRInteractionHandler
onSelectMissed?: XRInteractionHandler
onSelect?: XRInteractionHandler
onSqueezeStart?: XRInteractionHandler
onSqueezeEnd?: XRInteractionHandler
onSqueezeMissed?: XRInteractionHandler
onSqueeze?: XRInteractionHandler
onMove?: XRInteractionHandler
children: React.ReactNode
}
export const Interactive = React.forwardRef<THREE.Group, InteractiveProps>(function Interactive(
{
onHover,
onBlur,
onSelectStart,
onSelectEnd,
onSelectMissed,
onSelect,
onSqueezeStart,
onSqueezeEnd,
onSqueezeMissed,
onSqueeze,
onMove,
children
}: InteractiveProps,
passedRef
) {
const ref = React.useRef<THREE.Group>(null!)
React.useImperativeHandle(passedRef, () => ref.current)
useInteraction(ref, 'onHover', onHover)
useInteraction(ref, 'onBlur', onBlur)
useInteraction(ref, 'onSelectStart', onSelectStart)
useInteraction(ref, 'onSelectEnd', onSelectEnd)
useInteraction(ref, 'onSelectMissed', onSelectMissed)
useInteraction(ref, 'onSelect', onSelect)
useInteraction(ref, 'onSqueezeStart', onSqueezeStart)
useInteraction(ref, 'onSqueezeEnd', onSqueezeEnd)
useInteraction(ref, 'onSqueezeMissed', onSqueezeMissed)
useInteraction(ref, 'onSqueeze', onSqueeze)
useInteraction(ref, 'onMove', onMove)
return <group ref={ref}>{children}</group>
})
export interface RayGrabProps extends InteractiveProps {}
export const RayGrab = React.forwardRef<THREE.Group, RayGrabProps>(function RayGrab(
{ onSelectStart, onSelectEnd, children, ...rest },
forwardedRef
) {
const grabbingController = React.useRef<THREE.Object3D>()
const groupRef = React.useRef<THREE.Group>(null!)
const previousTransform = React.useMemo(() => new THREE.Matrix4(), [])
React.useImperativeHandle(forwardedRef, () => groupRef.current)
useFrame(() => {
const controller = grabbingController.current
const group = groupRef.current
if (!controller) return
group.applyMatrix4(previousTransform)
group.applyMatrix4(controller.matrixWorld)
group.updateMatrixWorld()
previousTransform.copy(controller.matrixWorld).invert()
})
return (
<Interactive
ref={groupRef}
onSelectStart={(e) => {
grabbingController.current = e.target.controller
previousTransform.copy(e.target.controller.matrixWorld).invert()
onSelectStart?.(e)
}}
onSelectEnd={(e) => {
if (e.target.controller === grabbingController.current) {
grabbingController.current = undefined
}
onSelectEnd?.(e)
}}
{...rest}
>
{children}
</Interactive>
)
})
export type HitTestCallback = (hitMatrix: THREE.Matrix4, hit: XRHitTestResult) => void
export function useHitTest(hitTestCallback: HitTestCallback) {
const session = useXR((state) => state.session)
const hitTestSource = React.useRef<XRHitTestSource | undefined>()
const hitMatrix = React.useMemo(() => new THREE.Matrix4(), [])
useIsomorphicLayoutEffect(() => {
if (!session) return void (hitTestSource.current = undefined)
session.requestReferenceSpace('viewer').then(async (referenceSpace) => {
hitTestSource.current = await session?.requestHitTestSource?.({ space: referenceSpace })
})
}, [session])
useFrame((state, _, frame: XRFrame) => {
if (!frame || !hitTestSource.current) return
const [hit] = frame.getHitTestResults(hitTestSource.current)
if (hit) {
const referenceSpace = state.gl.xr.getReferenceSpace()!
const pose = hit.getPose(referenceSpace)
if (pose) {
hitMatrix.fromArray(pose.transform.matrix)
hitTestCallback(hitMatrix, hit)
}
}
})
}