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import React from "react";
import { HttpTimelinePostInfo } from "@/http/timeline";
import TimelinePostListView, {
TimelinePostListViewProps,
} from "./TimelinePostListView";
export interface TimelinePagedPostListViewProps {
className?: string;
style?: React.CSSProperties;
posts: HttpTimelinePostInfo[];
onReload: () => void;
}
const TimelinePagedPostListView: React.FC<TimelinePagedPostListViewProps> = (
props
) => {
const { className, style, posts, onReload } = props;
const [lastViewCount, setLastViewCount] = React.useState<number>(10);
const viewingPosts = React.useMemo(() => {
const p: TimelinePostListViewProps["posts"] =
lastViewCount >= posts.length
? posts.slice()
: posts.slice(-lastViewCount);
for (let i = 0; i < p.length; i++) {
p[p.length - i - 1].enterDelay = (i % 10) * 0.4;
}
return p;
}, [posts, lastViewCount]);
React.useEffect(() => {
if (lastViewCount < posts.length) {
const listener = (): void => {
if (window.scrollY === 0 && lastViewCount < posts.length) {
setLastViewCount(lastViewCount + 10);
}
};
window.addEventListener("scroll", listener);
return () => window.removeEventListener("scroll", listener);
}
}, [lastViewCount, posts]);
return (
<TimelinePostListView
className={className}
style={style}
posts={viewingPosts}
onReload={onReload}
/>
);
};
export default TimelinePagedPostListView;
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