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Fix scroll behavior and others on paused timeline (#4864) 

Resolved:

* Lot of redundant renders while mouse moving
* Scroll jumping when timeline loaded
* Scroll position isn't kept when statuses below the scrollTop was deleted then new status arrived

Unresolved:

* Scroll position isn't kept when statuses over the scrollTop was deleted then new status arrived
-> It needs to know which statuses are over the scrollTop
* New status indicator should be active when new statuses arrived while mouse moved recently
-> It needs a) update indicator in ScrollableList, or b) set scrollTop status while mouse moving
This commit is contained in:
unarist 2017-09-09 21:16:11 +09:00 committed by Eugen Rochko
parent c9d04f1c39
commit c7908e2d09
1 changed files with 13 additions and 11 deletions
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24
app/javascript/mastodon/components/scrollable_list.js
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@ -52,11 +52,11 @@ export default class ScrollableList extends PureComponent {
});
handleMouseMove = throttle(() => {
this.setState({ lastMouseMove: new Date() });
this._lastMouseMove = new Date();
}, 300);
handleMouseLeave = () => {
this.setState({ lastMouseMove: null });
this._lastMouseMove = null;
}
componentDidMount () {
@ -68,18 +68,20 @@ export default class ScrollableList extends PureComponent {
}
componentDidUpdate (prevProps) {
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);
// Reset the scroll position when a new child comes in in order not to
// jerk the scrollbar around if you're already scrolled down the page.
if (React.Children.count(prevProps.children) < React.Children.count(this.props.children) && this._oldScrollPosition && (this.node.scrollTop > 0 || this._recentlyMoved())) {
if (this.getFirstChildKey(prevProps) !== this.getFirstChildKey(this.props)) {
const newScrollTop = this.node.scrollHeight - this._oldScrollPosition;
if (someItemInserted && this._oldScrollPosition && (this.node.scrollTop > 0 || this._recentlyMoved())) {
const newScrollTop = this.node.scrollHeight - this._oldScrollPosition;
if (this.node.scrollTop !== newScrollTop) {
this.node.scrollTop = newScrollTop;
}
} else {
this._oldScrollPosition = this.node.scrollHeight - this.node.scrollTop;
if (this.node.scrollTop !== newScrollTop) {
this.node.scrollTop = newScrollTop;
}
} else {
this._oldScrollPosition = this.node.scrollHeight - this.node.scrollTop;
}
}
@ -128,7 +130,7 @@ export default class ScrollableList extends PureComponent {
}
_recentlyMoved () {
return this.state.lastMouseMove === null || ((new Date()) - this.state.lastMouseMove < 600);
return this._lastMouseMove !== null && ((new Date()) - this._lastMouseMove < 600);
}
handleKeyDown = (e) => {