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Improve RovingTabIndex & Room List filtering performance (#6987)

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Michael Telatynski 2021-10-26 12:16:50 +01:00 • committed by GitHub
parent 39e61c4fa3
commit 04c06b6aa8
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9 changed files with 471 additions and 327 deletions
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75
src/components/structures/LeftPanel.tsx
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@ -40,6 +40,7 @@ import { replaceableComponent } from "../../utils/replaceableComponent";
import SpaceStore, { UPDATE_SELECTED_SPACE } from "../../stores/SpaceStore";
import { getKeyBindingsManager, RoomListAction } from "../../KeyBindingsManager";
import UIStore from "../../stores/UIStore";
import { findSiblingElement, IState as IRovingTabIndexState } from "../../accessibility/RovingTabIndex";
interface IProps {
isMinimized: boolean;
@ -51,19 +52,12 @@ interface IState {
activeSpace?: Room;
}
// List of CSS classes which should be included in keyboard navigation within the room list
const cssClasses = [
"mx_RoomSearch_input",
"mx_RoomSearch_minimizedHandle", // minimized <RoomSearch />
"mx_RoomSublist_headerText",
"mx_RoomTile",
"mx_RoomSublist_showNButton",
];
@replaceableComponent("structures.LeftPanel")
export default class LeftPanel extends React.Component<IProps, IState> {
private ref: React.RefObject<HTMLDivElement> = createRef();
private listContainerRef: React.RefObject<HTMLDivElement> = createRef();
private ref = createRef<HTMLDivElement>();
private listContainerRef = createRef<HTMLDivElement>();
private roomSearchRef = createRef<RoomSearch>();
private roomListRef = createRef<RoomList>();
private focusedElement = null;
private isDoingStickyHeaders = false;
@ -283,16 +277,25 @@ export default class LeftPanel extends React.Component<IProps, IState> {
this.focusedElement = null;
};
private onKeyDown = (ev: React.KeyboardEvent) => {
private onKeyDown = (ev: React.KeyboardEvent, state?: IRovingTabIndexState) => {
if (!this.focusedElement) return;
const action = getKeyBindingsManager().getRoomListAction(ev);
switch (action) {
case RoomListAction.NextRoom:
if (!state) {
ev.stopPropagation();
ev.preventDefault();
this.roomListRef.current?.focus();
}
break;
case RoomListAction.PrevRoom:
ev.stopPropagation();
ev.preventDefault();
this.onMoveFocus(action === RoomListAction.PrevRoom);
if (state && state.activeRef === findSiblingElement(state.refs, 0)) {
ev.stopPropagation();
ev.preventDefault();
this.roomSearchRef.current?.focus();
}
break;
}
};
@ -305,45 +308,6 @@ export default class LeftPanel extends React.Component<IProps, IState> {
}
};
private onMoveFocus = (up: boolean) => {
let element = this.focusedElement;
let descending = false; // are we currently descending or ascending through the DOM tree?
let classes: DOMTokenList;
do {
const child = up ? element.lastElementChild : element.firstElementChild;
const sibling = up ? element.previousElementSibling : element.nextElementSibling;
if (descending) {
if (child) {
element = child;
} else if (sibling) {
element = sibling;
} else {
descending = false;
element = element.parentElement;
}
} else {
if (sibling) {
element = sibling;
descending = true;
} else {
element = element.parentElement;
}
}
if (element) {
classes = element.classList;
}
} while (element && (!cssClasses.some(c => classes.contains(c)) || element.offsetParent === null));
if (element) {
element.focus();
this.focusedElement = element;
}
};
private renderHeader(): React.ReactNode {
return (
<div className="mx_LeftPanel_userHeader">
@ -388,7 +352,7 @@ export default class LeftPanel extends React.Component<IProps, IState> {
>
<RoomSearch
isMinimized={this.props.isMinimized}
onKeyDown={this.onKeyDown}
ref={this.roomSearchRef}
onSelectRoom={this.selectRoom}
/>
@ -417,6 +381,7 @@ export default class LeftPanel extends React.Component<IProps, IState> {
activeSpace={this.state.activeSpace}
onResize={this.refreshStickyHeaders}
onListCollapse={this.refreshStickyHeaders}
ref={this.roomListRef}
/>;
const containerClasses = classNames({