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Use passive option for scroll handler

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This commit is contained in:
Germain Souquet 2021-05-28 14:59:14 +01:00
parent 71b217e4a1
commit f10e95956b
5 changed files with 32 additions and 7 deletions
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9
src/components/views/rooms/RoomSublist.tsx
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@ -105,6 +105,7 @@ interface IState {
export default class RoomSublist extends React.Component<IProps, IState> {
private headerButton = createRef<HTMLDivElement>();
private sublistRef = createRef<HTMLDivElement>();
private tilesRef = createRef<HTMLDivElement>();
private dispatcherRef: string;
private layout: ListLayout;
private heightAtStart: number;
@ -246,11 +247,15 @@ export default class RoomSublist extends React.Component<IProps, IState> {
public componentDidMount() {
this.dispatcherRef = defaultDispatcher.register(this.onAction);
RoomListStore.instance.on(LISTS_UPDATE_EVENT, this.onListsUpdated);
// Using the passive option to not block the main thread
// https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener#improving_scrolling_performance_with_passive_listeners
this.tilesRef.current.addEventListener("scroll", this.onScrollPrevent, { passive: true });
}
public componentWillUnmount() {
defaultDispatcher.unregister(this.dispatcherRef);
RoomListStore.instance.off(LISTS_UPDATE_EVENT, this.onListsUpdated);
this.tilesRef.current.removeEventListener("scroll", this.onScrollPrevent);
}
private onListsUpdated = () => {
@ -755,7 +760,7 @@ export default class RoomSublist extends React.Component<IProps, IState> {
);
}
private onScrollPrevent(e: React.UIEvent<HTMLDivElement>) {
private onScrollPrevent(e: Event) {
// the RoomTile calls scrollIntoView and the browser may scroll a div we do not wish to be scrollable
// this fixes https://github.com/vector-im/element-web/issues/14413
(e.target as HTMLDivElement).scrollTop = 0;
@ -884,7 +889,7 @@ export default class RoomSublist extends React.Component<IProps, IState> {
className="mx_RoomSublist_resizeBox"
enable={handles}
>
<div className="mx_RoomSublist_tiles" onScroll={this.onScrollPrevent}>
<div className="mx_RoomSublist_tiles" ref={this.tilesRef}>
{visibleTiles}
</div>
{showNButton}