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Masonry Layout

Masonry Layout allows you to create a grid of items with different heights. It is a great way to display a collection of images with different sizes.

To get started, import MasonryFlashList from @shopify/flash-list and use it just like you would use FlashList:

import React from "react";
import { View, Text, StatusBar } from "react-native";
import { MasonryFlashList } from "@shopify/flash-list";
import { DATA } from "./data";

const MyMasonryList = () => {
return (
<MasonryFlashList
data={DATA}
numColumns={2}
renderItem={({ item }) => <Text>{item.title}</Text>}
estimatedItemSize={200}
/>
);
};

Note: If you want MasonryFlashList to optimize item arrangement, enable optimizeItemArrangement and pass a valid overrideItemLayout function.

Unsupported Props​

There are some props that MasonryFlashList does not support when compared to FlashList:

Additional Props​

MasonryFlashList supports these additional props on top of FlashList:

optimizeItemArrangement​

optimizeItemArrangement?: boolean;

If enabled, MasonryFlashList will try to reduce difference in column height by modifying item order. If true, specifying overrideItemLayout is required. Default value is false.

getColumnFlex​

getColumnFlex?: (
items: T[],
columnIndex: number,
maxColumns: number,
extraData?: any
) => number;

getColumnFlex allows you to change the column widths of the list. This is helpful if you want some columns to be wider than the others.

Example:

// if `numColumns` is `3`, you can return `2` for `index 1` and `1` for the rest to achieve a `1:2:1` split by width.
getColumnFlex={(items, index, maxColumns, extraData) => {
return index === 1 ? 2 : 1;
}}

Additional information in renderItem arguments​

export interface MasonryListRenderItemInfo<TItem>
extends ListRenderItemInfo<TItem> {
columnSpan: number;
columnIndex: number;
}

When using MasonryFlashList the renderItem prop callback will be called with two additional properties on the info object.

columnIndex: A number representing the index of the column in which the item is rendered. When using optimizeItemArrangement this becomes more important as the items are no longer spread linearly across the columns.

columnSpan: A number representing how many columns a given item may span, for now this will always return 1.

Methods​

MasonryFlashList exposes the some methods that FlashList does. These are:

scrollToEnd()​

scrollToEnd?: (params?: { animated?: boolean | null | undefined });

Scrolls to the end of the content.

scrollToOffset()​

scrollToOffset(params: {
animated?: boolean | null | undefined;
offset: number;
});

Scroll to a specific content pixel offset in the list.

Parameter offset expects the offset to scroll to.

Parameter animated (false by default) defines whether the list should animate while scrolling.