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where ResizeObserver is support, restore anchored node on resize

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This commit is contained in:
Bruno Windels 2021-09-15 17:23:28 +02:00
parent 04edff29cf
commit 2c415e37e7
1 changed files with 19 additions and 1 deletions
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20
src/platform/web/ui/session/room/TimelineView.ts
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@ -69,6 +69,7 @@ export class TimelineView extends TemplateView<TimelineViewModel> {
private anchoredBottom: number = 0;
private stickToBottom: boolean = true;
private tilesView?: TilesListView;
private resizeObserver?: ResizeObserver;
render(t: TemplateBuilder, vm: TimelineViewModel) {
// assume this view will be mounted in the parent DOM straight away
@ -77,9 +78,26 @@ export class TimelineView extends TemplateView<TimelineViewModel> {
this.restoreScrollPosition();
});
this.tilesView = new TilesListView(vm.tiles, () => this.restoreScrollPosition());
return t.div({className: "Timeline bottom-aligned-scroll", onScroll: () => this.onScroll()}, [
const root = t.div({className: "Timeline bottom-aligned-scroll", onScroll: () => this.onScroll()}, [
t.view(this.tilesView)
]);
if (typeof ResizeObserver === "function") {
this.resizeObserver = new ResizeObserver(() => {
this.restoreScrollPosition();
});
this.resizeObserver.observe(root);
}
return root;
}
public unmount() {
super.unmount();
if (this.resizeObserver) {
this.resizeObserver.unobserve(this.root());
this.resizeObserver = null;
}
}
private restoreScrollPosition() {