CADmium

<script lang="ts">
  import {forwardEventHandlers, T, useTask, useParent, useThrelte} from "@threlte/core"

  import type {Camera} from "three"
  import {TrackballControls as ThreeTrackballControls} from "./CadControls.js"

  import {onDestroy} from "svelte"

  import {useControlsContext} from "./useControlsContext.js"
  import type {TrackballControlsEvents, TrackballControlsProps, TrackballControlsSlots} from "./TrackballControls.svelte.js"

  type $$Props = TrackballControlsProps
  type $$Events = TrackballControlsEvents
  type $$Slots = TrackballControlsSlots

  const parent = useParent()

  const isCamera = (p: any): p is Camera => {
    return p.isCamera
  }

  const {renderer, invalidate} = useThrelte()

  if (!isCamera($parent)) {
    throw new Error("Parent missing: <TrackballControls> need to be a child of a <Camera>")
  }

  export const ref = new ThreeTrackballControls($parent, renderer.domElement)

  useTask(ref.update, {
    autoInvalidate: false,
  })

  const component = forwardEventHandlers()

  const {trackballControls} = useControlsContext()
  trackballControls.set(ref)
  onDestroy(() => trackballControls.set(undefined))
</script>

<T is={ref} let:ref {...$$restProps} bind:this={$component} on:change={invalidate}>
  <slot {ref} />
</T>