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Check if the message panel is at the end of the timeline on init

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Fixes https://github.com/vector-im/riot-web/issues/8503

componentDidUpdate is called a lot, and we don't really want to keep checking the messagePanel, so this introduces a new flag to check if the init is even needed.
This commit is contained in:
Travis Ralston 2019-03-26 14:22:48 -06:00
parent db834b315a
commit 4eb9fa6922
1 changed files with 7 additions and 0 deletions
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7
src/components/structures/RoomView.js
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@ -144,6 +144,7 @@ module.exports = React.createClass({
// the end of the live timeline. It has the effect of hiding the
// 'scroll to bottom' knob, among a couple of other things.
atEndOfLiveTimeline: true,
atEndOfLiveTimelineInit: false, // used by componentDidUpdate to avoid unnecessary checks
showTopUnreadMessagesBar: false,
@ -428,6 +429,12 @@ module.exports = React.createClass({
roomView.addEventListener('dragend', this.onDragLeaveOrEnd);
}
}
if (this.refs.messagePanel && !this.state.atEndOfLiveTimelineInit) {
this.setState({
atEndOfLiveTimelineInit: true,
atEndOfLiveTimeline: this.refs.messagePanel.isAtEndOfLiveTimeline(),
});
}
},
componentWillUnmount: function() {