Idem with <Tile/>
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@ -1,4 +1,5 @@
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import react, { useEffect, useRef } from 'react';
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import react, { memo, useEffect, useRef } from 'react';
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import { isEqual } from 'lodash';
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export interface TileProperties {
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/** The image's source URL */
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@ -13,20 +14,20 @@ export interface TileProperties {
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* @returns A tile
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*
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* Tile components are containers for images.
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*
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*
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* They return an empty `<g/>` element immediately so that the rendering can proceed
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* and append an `<image/>` element whenever the image is loaded.
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*
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*
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* They are designed to be part of {@link components/map/TiledLayer!TiledLayer} components in SVG `<g/>` elements
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* in which the unit is the tile size. In this coordinate system their size is thus always equal to 1.
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* in which the unit is the tile size. In this coordinate system their size is thus always equal to 1.
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*/
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export const Tile: react.FC<TileProperties> = (props: TileProperties) => {
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export const Tile: react.FC<TileProperties> = memo((props: TileProperties) => {
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const g = useRef<SVGGElement>(null);
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const timeout = (ms: number) => {
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return new Promise((resolve) => setTimeout(resolve, ms));
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};
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console.log(`Rendering tile: ${props.href}`);
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useEffect(() => {
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const loadImage = async () => {
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console.log(`Pre loading: ${props.href}`);
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@ -54,6 +55,6 @@ export const Tile: react.FC<TileProperties> = (props: TileProperties) => {
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}, [props.href]);
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return <g ref={g} />;
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};
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}, isEqual);
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export default Tile;
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