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Speed up processing of TimelinePanel updates on new events

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Avoid twiddling state flags, so that we can avoid redundant re-renders.
This commit is contained in:
Richard van der Hoff 2016-04-19 18:29:25 +01:00
parent 9bd68ba5a8
commit a6bcbd4f61
1 changed files with 29 additions and 8 deletions
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35
src/components/structures/TimelinePanel.js
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@ -175,8 +175,27 @@ var TimelinePanel = React.createClass({
},
shouldComponentUpdate: function(nextProps, nextState) {
return (!ObjectUtils.shallowEqual(this.props, nextProps) ||
!ObjectUtils.shallowEqual(this.state, nextState));
if (!ObjectUtils.shallowEqual(this.props, nextProps)) {
if (DEBUG) {
console.group("Timeline.shouldComponentUpdate: props change");
console.log("props before:", this.props);
console.log("props after:", nextProps);
console.groupEnd();
}
return true;
}
if (!ObjectUtils.shallowEqual(this.state, nextState)) {
if (DEBUG) {
console.group("Timeline.shouldComponentUpdate: state change");
console.log("state before:", this.state);
console.log("state after:", nextState);
console.groupEnd();
}
return true;
}
return false;
},
componentWillUnmount: function() {
@ -267,13 +286,15 @@ var TimelinePanel = React.createClass({
// updates from pagination will happen when the paginate completes.
if (toStartOfTimeline || !data || !data.liveEvent) return;
// even if we previously gave up forward-paginating, it's worth
// having another go now.
this.setState({canForwardPaginate: true});
if (!this.refs.messagePanel) return;
if (!this.refs.messagePanel.getScrollState().stuckAtBottom) return;
if (!this.refs.messagePanel.getScrollState().stuckAtBottom) {
// we won't load this event now, because we don't want to push any
// events off the other end of the timeline. But we need to note
// that we can now paginate.
this.setState({canForwardPaginate: true});
return;
}
// when a new event arrives when the user is not watching the window, but the
// window is in its auto-scroll mode, make sure the read marker is visible.