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@ -23,6 +23,7 @@ import { Room } from "matrix-js-sdk/src/models/room"; |
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import defaultDispatcher from "../../../dispatcher/dispatcher"; |
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import Analytics from "../../../Analytics"; |
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import { UPDATE_EVENT } from "../../../stores/AsyncStore"; |
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import { CSSTransition, TransitionGroup } from "react-transition-group"; |
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/******************************************************************* |
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* CAUTION * |
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@ -36,6 +37,14 @@ interface IProps { |
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} |
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interface IState { |
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// Both of these control the animation for the breadcrumbs. For details on the
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// actual animation, see the CSS.
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//
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// doAnimation is to lie to the CSSTransition component (see onBreadcrumbsUpdate
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// for info). skipFirst is used to try and reduce jerky animation - also see the
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// breadcrumb update function for info on that.
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doAnimation: boolean; |
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skipFirst: boolean; |
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} |
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export default class RoomBreadcrumbs2 extends React.PureComponent<IProps, IState> { |
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@ -44,6 +53,11 @@ export default class RoomBreadcrumbs2 extends React.PureComponent<IProps, IState |
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constructor(props: IProps) { |
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super(props); |
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this.state = { |
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doAnimation: true, // technically we want animation on mount, but it won't be perfect
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skipFirst: false, // render the thing, as boring as it is
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}; |
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BreadcrumbsStore.instance.on(UPDATE_EVENT, this.onBreadcrumbsUpdate); |
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} |
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@ -54,7 +68,16 @@ export default class RoomBreadcrumbs2 extends React.PureComponent<IProps, IState |
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private onBreadcrumbsUpdate = () => { |
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if (!this.isMounted) return; |
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this.forceUpdate(); // we have no state, so this is the best we can do
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// We need to trick the CSSTransition component into updating, which means we need to
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// tell it to not animate, then to animate a moment later. This causes two updates
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// which means two renders. The skipFirst change is so that our don't-animate state
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// doesn't show the breadcrumb we're about to reveal as it causes a visual jump/jerk.
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// The second update, on the next available tick, causes the "enter" animation to start
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// again and this time we want to show the newest breadcrumb because it'll be hidden
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// off screen for the animation.
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this.setState({doAnimation: false, skipFirst: true}); |
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setTimeout(() => this.setState({doAnimation: true, skipFirst: false}), 0); |
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}; |
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private viewRoom = (room: Room, index: number) => { |
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@ -77,14 +100,26 @@ export default class RoomBreadcrumbs2 extends React.PureComponent<IProps, IState |
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) |
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}); |
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if (tiles.length === 0) { |
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tiles.push( |
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<div className="mx_RoomBreadcrumbs2_placeholder"> |
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{_t("No recently visited rooms")} |
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if (tiles.length > 0) { |
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// NOTE: The CSSTransition timeout MUST match the timeout in our CSS!
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return ( |
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<CSSTransition |
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appear={true} in={this.state.doAnimation} timeout={300} |
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classNames='mx_RoomBreadcrumbs2' |
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> |
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<div className='mx_RoomBreadcrumbs2'> |
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{tiles.slice(this.state.skipFirst ? 1 : 0)} |
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</div> |
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</CSSTransition> |
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); |
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} else { |
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return ( |
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<div className='mx_RoomBreadcrumbs2'> |
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<div className="mx_RoomBreadcrumbs2_placeholder"> |
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{_t("No recently visited rooms")} |
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</div> |
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</div> |
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); |
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} |
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return <div className='mx_RoomBreadcrumbs2'>{tiles}</div>; |
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} |
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} |
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Travis Ralston
5 years ago