tldraw/components/canvas/page.tsx
2021-05-23 14:46:04 +01:00

25 lines
677 B
TypeScript

import { useSelector } from "state"
import { deepCompareArrays, getPage } from "utils/utils"
import Shape from "./shape"
/*
On each state change, compare node ids of all shapes
on the current page. Kind of expensive but only happens
here; and still cheaper than any other pattern I've found.
*/
export default function Page() {
const currentPageShapeIds = useSelector(({ data }) => {
return Object.values(getPage(data).shapes)
.sort((a, b) => a.childIndex - b.childIndex)
.map((shape) => shape.id)
}, deepCompareArrays)
return (
<>
{currentPageShapeIds.map((shapeId) => (
<Shape key={shapeId} id={shapeId} />
))}
</>
)
}