Function acquireVirtualizer

packages/session-ui/src/pierre/virtualizer.ts:66–100

(container: HTMLElement)

}

export function acquireVirtualizer(container: HTMLElement) {
  const resolved = target(container)
  if (!resolved) return

  let entry = cache.get(resolved.key)
  if (!entry) {
    const virtualizer = new Virtualizer()
    virtualizer.setup(resolved.root, resolved.content)
    entry = {
      virtualizer,
      refs: 0,
    }
    cache.set(resolved.key, entry)
  }

  entry.refs += 1
  let done = false

  return {
    virtualizer: entry.virtualizer,
    release() {
      if (done) return
      done = true

      const current = cache.get(resolved.key)
      if (!current) return

      current.refs -= 1
      if (current.refs > 0) return

      current.virtualizer.cleanUp()
      cache.delete(resolved.key)
    },
  }
}