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* MasonryFeed - 瀑布流布局组件
*
* Pinterest/小红书风格的双列瀑布流
*/
import React, { memo, useCallback, useMemo, useState } from 'react';
import { Dimensions, RefreshControl, ScrollView } from 'react-native';
import { styled, YStack, Stack, Spinner, Text } from 'tamagui';
import { PostCard, PostCardData } from './PostCard';
const { width: SCREEN_WIDTH } = Dimensions.get('window');
const COLUMN_GAP = 12;
const HORIZONTAL_PADDING = 16;
const COLUMN_WIDTH = (SCREEN_WIDTH - HORIZONTAL_PADDING * 2 - COLUMN_GAP) / 2;
export interface MasonryFeedProps {
data: PostCardData[];
onPostPress?: (post: PostCardData) => void;
onLikePress?: (post: PostCardData) => void;
onAuthorPress?: (author: PostCardData['author']) => void;
onRefresh?: () => Promise<void>;
onEndReached?: () => void;
isLoading?: boolean;
isRefreshing?: boolean;
ListEmptyComponent?: React.ReactNode;
}
const FeedContainer = styled(Stack, {
name: 'FeedContainer',
flex: 1,
backgroundColor: '$backgroundSubtle',
});
const ColumnsContainer = styled(Stack, {
name: 'ColumnsContainer',
flexDirection: 'row',
paddingHorizontal: HORIZONTAL_PADDING,
gap: COLUMN_GAP,
});
const Column = styled(YStack, {
name: 'MasonryColumn',
flex: 1,
gap: COLUMN_GAP,
});
const LoadingContainer = styled(YStack, {
name: 'LoadingContainer',
flex: 1,
alignItems: 'center',
justifyContent: 'center',
padding: '$8',
});
const EmptyContainer = styled(YStack, {
name: 'EmptyContainer',
flex: 1,
alignItems: 'center',
justifyContent: 'center',
padding: '$8',
gap: '$3',
});
const EmptyText = styled(Text, {
name: 'EmptyText',
fontSize: '$4',
textAlign: 'center',
});
function distributeToColumns(data: PostCardData[], columnCount: number): PostCardData[][] {
const columns: PostCardData[][] = Array.from({ length: columnCount }, () => []);
const columnHeights: number[] = Array(columnCount).fill(0);
data.forEach((item) => {
const shortestColumn = columnHeights.indexOf(Math.min(...columnHeights));
columns[shortestColumn].push(item);
const estimatedHeight = (item.imageHeight || COLUMN_WIDTH * 1.2) + 80;
columnHeights[shortestColumn] += estimatedHeight;
});
return columns;
}
function MasonryFeedComponent({
data,
onPostPress,
onLikePress,
onAuthorPress,
onRefresh,
onEndReached,
isLoading = false,
isRefreshing = false,
ListEmptyComponent,
}: MasonryFeedProps) {
const [refreshing, setRefreshing] = useState(false);
const columns = useMemo(() => distributeToColumns(data, 2), [data]);
const handleRefresh = useCallback(async () => {
Eif (onRefresh) {
setRefreshing(true);
await onRefresh();
setRefreshing(false);
}
}, [onRefresh]);
const handleScroll = useCallback(
(event: {
nativeEvent: {
contentOffset: { y: number };
contentSize: { height: number };
layoutMeasurement: { height: number };
};
}) => {
const { contentOffset, contentSize, layoutMeasurement } = event.nativeEvent;
const isCloseToBottom =
contentOffset.y + layoutMeasurement.height >= contentSize.height - 200;
if (isCloseToBottom && onEndReached) {
onEndReached();
}
},
[onEndReached]
);
if (isLoading && data.length === 0) {
return (
<LoadingContainer>
<Spinner size="large" color="$primary" />
</LoadingContainer>
);
}
if (!isLoading && data.length === 0) {
return (
<EmptyContainer>
{ListEmptyComponent || (
<>
<Text fontSize={48}>🐾</Text>
<EmptyText>还没有帖子</EmptyText>
<EmptyText fontSize="$3">成为第一个分享的人吧！</EmptyText>
</>
)}
</EmptyContainer>
);
}
return (
<FeedContainer>
<ScrollView
showsVerticalScrollIndicator={false}
onScroll={handleScroll}
scrollEventThrottle={16}
refreshControl={
onRefresh ? (
<RefreshControl
refreshing={refreshing || isRefreshing}
onRefresh={handleRefresh}
tintColor="#7FB093"
colors={['#7FB093']}
/>
) : undefined
}
contentContainerStyle={{
paddingTop: COLUMN_GAP,
paddingBottom: 100,
}}
>
<ColumnsContainer>
{columns.map((columnData, columnIndex) => (
<Column key={`column-${columnIndex}`}>
{columnData.map((item) => (
<PostCard
key={item.id}
data={item}
columnWidth={COLUMN_WIDTH}
onPress={onPostPress}
onLikePress={onLikePress}
onAuthorPress={onAuthorPress}
/>
))}
</Column>
))}
</ColumnsContainer>
</ScrollView>
</FeedContainer>
);
}
export const MasonryFeed = memo(MasonryFeedComponent);
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