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[Glitch] Temporarily hold timeline if mouse moved recently

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Port 6a1216d2cd to glitch-soc
This commit is contained in:
Thibaut Girka 2019-01-08 21:21:46 +01:00 committed by ThibG
parent 3a0b12cbfe
commit 21f27e6579
1 changed files with 48 additions and 2 deletions
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50
app/javascript/flavours/glitch/components/scrollable_list.js
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@ -10,6 +10,8 @@ import classNames from 'classnames';
import { attachFullscreenListener, detachFullscreenListener, isFullscreen } from 'flavours/glitch/util/fullscreen';
import LoadingIndicator from './loading_indicator';
const MOUSE_IDLE_DELAY = 300;
export default class ScrollableList extends PureComponent {
static contextTypes = {
@ -38,6 +40,8 @@ export default class ScrollableList extends PureComponent {
state = {
fullscreen: null,
mouseMovedRecently: false,
scrollToTopOnMouseIdle: false,
};
intersectionObserverWrapper = new IntersectionObserverWrapper();
@ -61,6 +65,47 @@ export default class ScrollableList extends PureComponent {
trailing: true,
});
mouseIdleTimer = null;
clearMouseIdleTimer = () => {
if (this.mouseIdleTimer === null) {
return;
}
clearTimeout(this.mouseIdleTimer);
this.mouseIdleTimer = null;
};
handleMouseMove = throttle(() => {
// As long as the mouse keeps moving, clear and restart the idle timer.
this.clearMouseIdleTimer();
this.mouseIdleTimer =
setTimeout(this.handleMouseIdle, MOUSE_IDLE_DELAY);
this.setState(({
mouseMovedRecently,
scrollToTopOnMouseIdle,
}) => ({
mouseMovedRecently: true,
// Only set scrollToTopOnMouseIdle if we just started moving and were
// scrolled to the top. Otherwise, just retain the previous state.
scrollToTopOnMouseIdle:
mouseMovedRecently
? scrollToTopOnMouseIdle
: (this.node.scrollTop === 0),
}));
}, MOUSE_IDLE_DELAY / 2);
handleMouseIdle = () => {
if (this.state.scrollToTopOnMouseIdle) {
this.node.scrollTop = 0;
this.props.onScrollToTop();
}
this.setState({
mouseMovedRecently: false,
scrollToTopOnMouseIdle: false,
});
}
componentDidMount () {
this.attachScrollListener();
this.attachIntersectionObserver();
@ -90,7 +135,7 @@ export default class ScrollableList extends PureComponent {
const someItemInserted = React.Children.count(prevProps.children) > 0 &&
React.Children.count(prevProps.children) < React.Children.count(this.props.children) &&
this.getFirstChildKey(prevProps) !== this.getFirstChildKey(this.props);
if (someItemInserted && this.node.scrollTop > 0) {
if ((someItemInserted && this.node.scrollTop > 0) || this.state.mouseMovedRecently) {
return this.node.scrollHeight - this.node.scrollTop;
} else {
return null;
@ -104,6 +149,7 @@ export default class ScrollableList extends PureComponent {
}
componentWillUnmount () {
this.clearMouseIdleTimer();
this.detachScrollListener();
this.detachIntersectionObserver();
detachFullscreenListener(this.onFullScreenChange);
@ -181,7 +227,7 @@ export default class ScrollableList extends PureComponent {
);
} else if (isLoading || childrenCount > 0 || hasMore || !emptyMessage) {
scrollableArea = (
<div className={classNames('scrollable', { fullscreen })} ref={this.setRef}>
<div className={classNames('scrollable', { fullscreen })} ref={this.setRef} onMouseMove={this.handleMouseMove}>
<div role='feed' className='item-list'>
{prepend}