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rework pagination - fixes #491

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previously, when adding items either at the beginnig (e.g. new notes
coming in while we're not looking at the top of the timeline) or a the
end (e.g. more items arriving from a background fetch) of a paginated
view, the resulting list got truncated to `displayLimit`, potentially
throwing data away and causing a new fetch.

This, coupled with the async nature of scrolling & fetching, could
cause weird results.

Also, `offset` was always incremented by the size of the fetched
results, even if not all of them were displayed, meant that it was
possible for offset-based pagination to drop items.

Finally, the "queue" of new items (usually, new notes) also got
truncated to `displayLimit`, which again could drop items (this effect
was usually masked by the first point: when scrolling to the top of
the timeline, if the queue's length was equal to `displayLimit`, those
notes displaced any existing ones, `unshiftItems` set
`more.value=true`, you got scrolled to the top, and notes were fetched
again, so you lost your position but at least all notes got shown,
eventually)
This commit is contained in:
dakkar 2024-04-19 13:35:18 +01:00
parent e0afeff248
commit dbfafe25e3
1 changed files with 9 additions and 9 deletions
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18
packages/frontend/src/components/MkPagination.vue
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@ -395,10 +395,10 @@ const prepend = (item: MisskeyEntity): void => {
* @param newItems 新しいアイテムの配列 * @param newItems 新しいアイテムの配列
*/ */
function unshiftItems(newItems: MisskeyEntity[]) { function unshiftItems(newItems: MisskeyEntity[]) {
const length = newItems.length + items.value.size; const prevLength = items.value.size;
items.value = new Map([...arrayToEntries(newItems), ...items.value].slice(0, props.displayLimit)); items.value = new Map([...arrayToEntries(newItems), ...items.value].slice(0, newItems.length + props.displayLimit));
// if we truncated, mark that there are more values to fetch
if (length >= props.displayLimit) more.value = true; if (items.value.size < prevLength) more.value = true;
} }
/** /**
@ -406,10 +406,10 @@ function unshiftItems(newItems: MisskeyEntity[]) {
* @param oldItems 古いアイテムの配列 * @param oldItems 古いアイテムの配列
*/ */
function concatItems(oldItems: MisskeyEntity[]) { function concatItems(oldItems: MisskeyEntity[]) {
const length = oldItems.length + items.value.size; const prevLength = items.value.size;
items.value = new Map([...items.value, ...arrayToEntries(oldItems)].slice(0, props.displayLimit)); items.value = new Map([...items.value, ...arrayToEntries(oldItems)].slice(0, oldItems.length + props.displayLimit));
// if we truncated, mark that there are more values to fetch
if (length >= props.displayLimit) more.value = true; if (items.value.size < prevLength) more.value = true;
} }
function executeQueue() { function executeQueue() {
@ -418,7 +418,7 @@ function executeQueue() {
} }
function prependQueue(newItem: MisskeyEntity) { function prependQueue(newItem: MisskeyEntity) {
queue.value = new Map([[newItem.id, newItem], ...queue.value].slice(0, props.displayLimit) as [string, MisskeyEntity][]); queue.value = new Map([[newItem.id, newItem], ...queue.value] as [string, MisskeyEntity][]);
} }
/* /*