peter
15ec67b029
NEXT_PAGE joins ANY fetch in flight: a read-ahead during an invalidation or a poll joined that refetch and appended no page, and nothing asked again until the reader moved the range (the channel page during a backfill). The read-ahead now waits while the list fetches anything (mayReadAhead, re-run on isFetching); a Load older click cancels a poll instead (nextPageOnClick). A page turn to a revealed row restarted the progressive mount at 30 rows; Channels focuses that row in the next commit, and at index 40 of a 50-row page it was not there, so focus fell to <body>. The mount now reaches through the revealed row.
93 lines
3.7 KiB
TypeScript
93 lines
3.7 KiB
TypeScript
import type { Video, VideoStatus } from "../lib/api";
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import { FEED_VIEW_SPEC, type FeedView } from "../lib/feedView";
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import type { NEXT_PAGE } from "../lib/nextPage";
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import VideoCard from "./VideoCard";
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import { VideoMenu } from "./VideoMenu";
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import { useContextMenu } from "./ui/useContextMenu";
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import VirtualGrid from "./ui/VirtualGrid";
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// Estimated row heights before measurement; real heights are measured per-row so these only affect
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// the very first paint and the scrollbar's initial guess. Taken from measuring each mode in the
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// browser rather than guessed — a bad estimate makes the scrollbar jump as you scroll in.
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// RE-MEASURE these when a mode's layout changes: they have gone stale twice already, most recently
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// when the E28 C1 action row moved onto the card's picture (cards 340 -> 262, small 257 -> 226).
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// The card figures are the roughest of the set by nature — a card's height follows its column width
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// (262 measured at 4 columns in a 1268px window), so no single constant is right for every window.
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const ROW_EST: Record<FeedView, number> = {
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cards: 262,
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cardsSmall: 226,
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rows: 117,
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rowsCompact: 46,
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tiles: 138,
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};
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export interface VirtualFeedProps {
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items: Video[];
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view: FeedView;
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onState: (id: string, status: VideoStatus) => void;
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onToggleSave: (id: string, saved: boolean) => void;
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onResetState: (id: string) => void;
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onOpen: (v: Video, startAt?: number | null) => void;
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hasNextPage: boolean;
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isFetching: boolean;
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fetchNextPage: (options: typeof NEXT_PAGE) => unknown;
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}
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// The feed's videos on the shared VirtualGrid engine — this wrapper only maps a FeedView to the
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// grid's layout spec and renders a VideoCard per item. All the virtualization mechanics (measure,
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// chunk, place, infinite-scroll) live in VirtualGrid.
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export default function VirtualFeed({
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items,
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view,
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onState,
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onToggleSave,
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onResetState,
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onOpen,
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hasNextPage,
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isFetching,
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fetchNextPage,
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}: VirtualFeedProps) {
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const { minCol, colMaxWidth, maxCols, thumb } = FEED_VIEW_SPEC[view];
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// The card menu (the video's whole action list, E28 C1) lives HERE rather than in each of the
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// feed's callers: this is the list, and `useContextMenu`'s contract is one menu per list. Mounting
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// it at this level is also what gives the channel page the menu for free — it renders
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// `<Feed channelScoped>`, so it is the same component all the way down.
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const menu = useContextMenu<Video>();
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const openId = menu.open ? menu.target?.id : undefined;
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return (
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<>
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<VirtualGrid
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items={items}
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getKey={(v) => v.id}
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minCol={minCol}
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colMaxWidth={colMaxWidth}
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maxCols={maxCols}
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rowEst={ROW_EST[view]}
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hasNextPage={hasNextPage}
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isFetching={isFetching}
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fetchNextPage={fetchNextPage}
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keyboardNav
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renderItem={(v, itemWidth, index) => (
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<VideoCard
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video={v}
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view={view}
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navIndex={index}
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// Only the one-line row (thumb:false) reads its own width — it stands columns down as it
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// narrows. Everything else takes a stable 0, so a resize (which changes itemWidth every
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// frame) doesn't blow past VideoCard's memo for views that wouldn't do anything with it.
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width={thumb ? 0 : itemWidth}
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onState={onState}
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onToggleSave={onToggleSave}
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onOpen={onOpen}
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menuProps={menu.triggerProps}
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menuButtonProps={menu.buttonProps}
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// A boolean per card, not the open id: only the two cards whose answer changes re-render.
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menuOpen={openId === v.id}
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/>
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)}
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/>
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<VideoMenu menu={menu} handlers={{ onState, onToggleSave, onResetState, onOpen }} />
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</>
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);
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}
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