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set min-height of messagelist to current height when showing typing bar

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this ensures the timeline never shrinks, and avoids jumpiness when
typing bar disappears again.
This commit is contained in:
Bruno Windels
2019-01-18 18:53:54 +01:00
parent 2920deaefe
commit c9d5c4903b
2 changed files with 30 additions and 3 deletions
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25
src/components/structures/ScrollPanel.js
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@ -223,6 +223,8 @@ module.exports = React.createClass({
onResize: function() {
this.props.onResize();
// clear min-height as the height might have changed
this.clearBlockShrinking();
this.checkScroll();
if (this._gemScroll) this._gemScroll.forceUpdate();
},
@ -372,6 +374,8 @@ module.exports = React.createClass({
}
this._unfillDebouncer = setTimeout(() => {
this._unfillDebouncer = null;
// if timeline shrinks, min-height should be cleared
this.clearBlockShrinking();
this.props.onUnfillRequest(backwards, markerScrollToken);
}, UNFILL_REQUEST_DEBOUNCE_MS);
}
@ -677,6 +681,27 @@ module.exports = React.createClass({
_collectGeminiScroll: function(gemScroll) {
this._gemScroll = gemScroll;
},
/**
* Set the current height as the min height for the message list
* so the timeline cannot shrink. This is used to avoid
* jumping when the typing indicator gets replaced by a smaller message.
*/
blockShrinking: function() {
const messageList = this.refs.itemlist;
if (messageList) {
const currentHeight = messageList.clientHeight - 18;
messageList.style.minHeight = `${currentHeight}px`;
}
},
/**
* Clear the previously set min height
*/
clearBlockShrinking: function() {
const messageList = this.refs.itemlist;
if (messageList) {
messageList.style.minHeight = null;
}
},
render: function() {
const GeminiScrollbarWrapper = sdk.getComponent("elements.GeminiScrollbarWrapper");