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Cache lowBandwidth setting to speed up BaseAvatar

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Signed-off-by: Robin Townsend <robin@robin.town>
This commit is contained in:
Robin Townsend 2021-06-06 23:08:47 -04:00
parent 903d4d252a
commit 1e574307d0
3 changed files with 17 additions and 4 deletions
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15
src/components/views/avatars/BaseAvatar.tsx
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@ -22,6 +22,7 @@ import classNames from 'classnames';
import * as AvatarLogic from '../../../Avatar';
import SettingsStore from "../../../settings/SettingsStore";
import AccessibleButton from '../elements/AccessibleButton';
import RoomContext from "../../../contexts/RoomContext";
import MatrixClientContext from "../../../contexts/MatrixClientContext";
import {useEventEmitter} from "../../../hooks/useEventEmitter";
import {toPx} from "../../../utils/units";
@ -44,12 +45,12 @@ interface IProps {
className?: string;
}
const calculateUrls = (url, urls) => {
const calculateUrls = (url, urls, lowBandwidth) => {
// work out the full set of urls to try to load. This is formed like so:
// imageUrls: [ props.url, ...props.urls ]
let _urls = [];
if (!SettingsStore.getValue("lowBandwidth")) {
if (!lowBandwidth) {
_urls = urls || [];
if (url) {
@ -63,7 +64,13 @@ const calculateUrls = (url, urls) => {
};
const useImageUrl = ({url, urls}): [string, () => void] => {
const [imageUrls, setUrls] = useState<string[]>(calculateUrls(url, urls));
// Since this is a hot code path and the settings store can be slow, we
// use the cached lowBandwidth value from the room context if it exists
const roomContext = useContext(RoomContext);
const lowBandwidth = roomContext ?
roomContext.lowBandwidth : SettingsStore.getValue("lowBandwidth");
const [imageUrls, setUrls] = useState<string[]>(calculateUrls(url, urls, lowBandwidth));
const [urlsIndex, setIndex] = useState<number>(0);
const onError = useCallback(() => {
@ -71,7 +78,7 @@ const useImageUrl = ({url, urls}): [string, () => void] => {
}, []);
useEffect(() => {
setUrls(calculateUrls(url, urls));
setUrls(calculateUrls(url, urls, lowBandwidth));
setIndex(0);
}, [url, JSON.stringify(urls)]); // eslint-disable-line react-hooks/exhaustive-deps