@huextrat/react-native-draggable-flatlist

⚠️ This is a fork of https://github.com/computerjazz/react-native-draggable-flatlist with some improvements ⚠️

• Reanimated V3 from https://github.com/computerjazz/react-native-draggable-flatlist/pull/550
• Fix warning about measureLayout from https://github.com/computerjazz/react-native-draggable-flatlist/pull/544
• Fix warning about modifying a key with worklet https://github.com/computerjazz/react-native-draggable-flatlist/pull/551
• Fix initial scroll jump on NestedDraggableFlatList https://github.com/computerjazz/react-native-draggable-flatlist/pull/514
• DX has been improved

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React Native Draggable FlatList

A drag-and-drop-enabled FlatList component for React Native.
Fully native interactions powered by Reanimated and React Native Gesture Handler.

To use swipeable list items in a DraggableFlatList see React Native Swipeable Item.

Install

1. Follow installation instructions for reanimated and react-native-gesture-handler. RNGH may require you to make changes to MainActivity.java. Be sure to follow all Android instructions!
2. Install this package using npm or yarn

with npm:

npm install --save @huextrat/react-native-draggable-flatlist

with yarn:

yarn add @huextrat/react-native-draggable-flatlist

1. import DraggableFlatList from 'react-native-draggable-flatlist'

Api

Props

All props are spread onto underlying FlatList

Name	Type	Description
data	T[]	Items to be rendered.
ref	React.RefObject<FlatList<T>>	FlatList ref to be forwarded to the underlying FlatList.
renderItem	(params: { item: T, getIndex: () => number | undefined, drag: () => void, isActive: boolean}) => JSX.Element	Call drag when the row should become active (i.e. in an onLongPress or onPressIn).
renderPlaceholder	(params: { item: T, index: number }) => React.ReactNode	Component to be rendered underneath the hovering component
keyExtractor	(item: T, index: number) => string	Unique key for each item (required)
onDragBegin	(index: number) => void	Called when row becomes active.
onRelease	(index: number) => void	Called when active row touch ends.
onDragEnd	(params: { data: T[], from: number, to: number }) => void	Called after animation has completed. Returns updated ordering of data
autoscrollThreshold	number	Distance from edge of container where list begins to autoscroll when dragging.
autoscrollSpeed	number	Determines how fast the list autoscrolls.
animationConfig	Partial<WithSpringConfig>	Configure list animations. See reanimated spring config
activationDistance	number	Distance a finger must travel before the gesture handler activates. Useful when using a draggable list within a TabNavigator so that the list does not capture navigator gestures.
onScrollOffsetChange	(offset: number) => void	Called with scroll offset. Stand-in for onScroll.
onPlaceholderIndexChange	(index: number) => void	Called when the index of the placeholder changes
dragItemOverflow	boolean	If true, dragged item follows finger beyond list boundary.
dragHitSlop	object: {top: number, left: number, bottom: number, right: number}	Enables control over what part of the connected view area can be used to begin recognizing the gesture. Numbers need to be non-positive (only possible to reduce responsive area).
debug	boolean	Enables debug logging and animation debugger.
containerStyle	StyleProp<ViewStyle>	Style of the main component.
simultaneousHandlers	React.Ref<any> or React.Ref<any>[]	References to other gesture handlers, mainly useful when using this component within a ScrollView. See Cross handler interactions.
itemEnteringAnimation	Reanimated AnimationBuilder (docs)	Animation when item is added to list.
itemExitingAnimation	Reanimated AnimationBuilder (docs)	Animation when item is removed from list.
itemLayoutAnimation	Reanimated AnimationBuilder (docs)	Animation when list items change position (enableLayoutAnimationExperimental prop must be true).
enableLayoutAnimationExperimental	boolean	Flag to turn on experimental support for itemLayoutAnimation.

Cell Decorators

Cell Decorators are an easy way to add common hover animations. For example, wrapping renderItem in the <ScaleDecorator> component will automatically scale up the active item while hovering (see example below).

ScaleDecorator, ShadowDecorator, and OpacityDecorator are currently exported. Developers may create their own custom decorators using the animated values provided by the useOnCellActiveAnimation hook.

Nesting DraggableFlatLists

It's possible to render multiple DraggableFlatList components within a single scrollable parent by wrapping one or more NestableDraggableFlatList components within an outer NestableScrollContainer component.

NestableScrollContainer extends the ScrollView from react-native-gesture-handler, and NestableDraggableFlatList extends DraggableFlatList, so all available props may be passed into both of them.

Note: When using NestableDraggableFlatLists, all React Native warnings about nested list performance will be disabled.

import { NestableScrollContainer, NestableDraggableFlatList } from "@huextrat/react-native-draggable-flatlist"

...

  const [data1, setData1] = useState(initialData1);
  const [data2, setData2] = useState(initialData2);
  const [data3, setData3] = useState(initialData3);

  return (
    <NestableScrollContainer>
      <Header text='List 1' />
      <NestableDraggableFlatList
        data={data1}
        renderItem={renderItem}
        keyExtractor={keyExtractor}
        onDragEnd={({ data }) => setData1(data)}
      />
      <Header text='List 2' />
      <NestableDraggableFlatList
        data={data2}
        renderItem={renderItem}
        keyExtractor={keyExtractor}
        onDragEnd={({ data }) => setData2(data)}
      />
      <Header text='List 3' />
      <NestableDraggableFlatList
        data={data3}
        renderItem={renderItem}
        keyExtractor={keyExtractor}
        onDragEnd={({ data }) => setData3(data)}
      />
    </NestableScrollContainer>
  )

Example

Example snack: https://snack.expo.dev/@huextrat/react-native-draggable-flatlist

import React, { useState } from "react";
import { Text, View, StyleSheet, TouchableOpacity } from "react-native";
import DraggableFlatList, {
  ScaleDecorator,
} from "react-native-draggable-flatlist";

const NUM_ITEMS = 10;
function getColor(i: number) {
  const multiplier = 255 / (NUM_ITEMS - 1);
  const colorVal = i * multiplier;
  return `rgb(${colorVal}, ${Math.abs(128 - colorVal)}, ${255 - colorVal})`;
}

type Item = {
  key: string;
  label: string;
  height: number;
  width: number;
  backgroundColor: string;
};

const initialData: Item[] = [...Array(NUM_ITEMS)].map((d, index) => {
  const backgroundColor = getColor(index);
  return {
    key: `item-${index}`,
    label: String(index) + "",
    height: 100,
    width: 60 + Math.random() * 40,
    backgroundColor,
  };
});

export default function App() {
  const [data, setData] = useState(initialData);

  const renderItem = ({ item, drag, isActive }: RenderItemParams<Item>) => {
    return (
      <ScaleDecorator>
        <TouchableOpacity
          onLongPress={drag}
          disabled={isActive}
          style={[
            styles.rowItem,
            { backgroundColor: isActive ? "red" : item.backgroundColor },
          ]}
        >
          <Text style={styles.text}>{item.label}</Text>
        </TouchableOpacity>
      </ScaleDecorator>
    );
  };

  return (
    <DraggableFlatList
      data={data}
      onDragEnd={({ data }) => setData(data)}
      keyExtractor={(item) => item.key}
      renderItem={renderItem}
    />
  );
}

const styles = StyleSheet.create({
  rowItem: {
    height: 100,
    width: 100,
    alignItems: "center",
    justifyContent: "center",
  },
  text: {
    color: "white",
    fontSize: 24,
    fontWeight: "bold",
    textAlign: "center",
  },
});