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watch bounds when shifting content

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This commit is contained in:
Roland Osborne 2022-04-21 14:29:28 -07:00
parent efbd714fa5
commit 462ff37ff3
1 changed files with 27 additions and 7 deletions
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34
net/web/src/User/Conversation/VirtualList/VirtualList.jsx
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@ -35,9 +35,18 @@ export function VirtualList({ topics }) {
setItems((m) => { m.delete(id); return new Map(m); }) setItems((m) => { m.delete(id); return new Map(m); })
} }
const growCanvasHeight = (val) => {
setCanvasHeight((h) => {
if (val > h) {
return val;
}
return h;
});
}
useEffect(() => { useEffect(() => {
if (viewHeight * 3 > canvasHeight) { if (viewHeight * 3 > canvasHeight) {
setCanvasHeight(viewHeight*3); growCanvasHeight(viewHeight*3);
} }
setTopics(); setTopics();
}, [viewHeight]); }, [viewHeight]);
@ -147,6 +156,11 @@ export function VirtualList({ topics }) {
} }
scrollTop.current += shift; scrollTop.current += shift;
listRef.current.scrollTo({ top: scrollTop.current, left: 0 }); listRef.current.scrollTo({ top: scrollTop.current, left: 0 });
let view = getPlacement();
if (view.position.bottom + REDZONE > canvasHeight) {
growCanvasHeight(view.position.bottom + REDZONE);
}
} }
} }
else { else {
@ -159,14 +173,20 @@ export function VirtualList({ topics }) {
pos += containers.current[i].height + 2 * GUTTER; pos += containers.current[i].height + 2 * GUTTER;
} }
if (pos + viewHeight + REDZONE > canvasHeight) { if (pos + REDZONE > canvasHeight) {
let shift = canvasHeight / 2; let shift = canvasHeight / 2;
for (let i = 0; i < containers.current.length; i++) { let view = getPlacement();
containers.current[i].top -= shift; if (view.position.top < shift + REDZONE) {
updateItem(containers.current[i].id, getItem(containers.current[i])); growCanvasHeight(view.position.bottom + REDZONE);
}
else {
for (let i = 0; i < containers.current.length; i++) {
containers.current[i].top -= shift;
updateItem(containers.current[i].id, getItem(containers.current[i]));
}
scrollTop.current -= shift;
listRef.current.scrollTo({ top: scrollTop.current, left: 0 });
} }
scrollTop.current -= shift;
listRef.current.scrollTo({ top: scrollTop.current, left: 0 });
} }
} }