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import React from "react";
import { fromEvent } from "rxjs";
import { filter, throttleTime } from "rxjs/operators";
import { HttpTimelinePostInfo } from "@/http/timeline";
import TimelinePostListView from "./TimelinePostListView";
import { setRecordDisabled } from "@/utilities/useReverseScrollPositionRemember";
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(() => {
return lastViewCount >= posts.length
? posts.slice()
: posts.slice(-lastViewCount);
}, [posts, lastViewCount]);
const scrollTopHandler = React.useRef<() => void>();
React.useEffect(() => {
scrollTopHandler.current = () => {
if (lastViewCount < posts.length) {
setRecordDisabled(true);
setLastViewCount(lastViewCount + 10);
setTimeout(() => {
setRecordDisabled(false);
}, 500);
}
};
}, [lastViewCount, posts]);
React.useEffect(() => {
const subscription = fromEvent(window, "scroll")
.pipe(
filter(() => window.scrollY === 0),
throttleTime(800)
)
.subscribe(() => {
scrollTopHandler.current?.();
});
return () => subscription.unsubscribe();
}, []);
return (
<TimelinePostListView
className={className}
style={style}
posts={viewingPosts}
onReload={onReload}
/>
);
};
export default TimelinePagedPostListView;
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