react-native-yet-another-sortable


A sortable scrollable grid / list component for React Native.
* Change number of columns and row height on the fly
* Much better performance (especially in debug, compared to alternatives)
* Fast updates
* Controllable order
* Auto-scroll when dragged item is close to the container's border
Essentially based on react-native-sortable-grid, it has some improvements and changes, that made me publish it as a separate package instead of making a PR.

Getting Started

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``
npm install react-native-yet-another-sortable --save
`

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Check out example project.

`javascript
import React, { useState, useCallback } from 'react';
import SortableGrid from 'react-native-yet-another-sortable';

const Example = () => {
const [data] = useState([
{ value: 0, key: 'key0' },
{ value: 1, key: 'key1' },
{ value: 2, key: 'key2' },
]);

const [order, setOrder] = useState(['key2', 'key1', 'key0']);

const renderItem = useCallback(({ value, color }) => (

{value}

), []);

return (

order={order}
data={data}
renderItem={renderItem}
onDeactivateDrag={setOrder}
/>

);
};
`

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| parameter | type | required | description |
| :-------- | :---- | :------- | :---------- |
| order | array of string keys | yes | array of data key properties used to determine entry order |
| data | array of objects with key property | yes | array of items to be passed to renderItem |
| rowHeight | number | no | row height |
| columns | number | no | number of columns per row |
| activationTreshold | number | no | time in ms required to activate drag on hold |
| transitionDuration | number | no | time in ms required to move cell to its position on release |
| renderItem | function | yes | render function for each entry, is passed a data item |

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| parameter | type | required | description |
| :-------- | :---- | :------- | :---------- |
| onActivateDrag | (key, grid) => void | no | Will execute after one holds the item for activateTreshold, before onGrantBlock |
| onGrantBlock | (event, gestureState, grid) => void | no | Will execute on drag start |
| onMoveBlock | (event, gestureState, grid) => void | no | Will execute on each move |
| onReleaseBlock | (event, gestureState, grid) => void | no | Will execute on drag release |
| onDeactivateDrag | (order, grid) => void | no | Will execute on active item drop, after onReleaseBlock, with new order as an argument |

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| parameter | type | required | description |
| :-------- | :---- | :------- | :---------- |
| inactive | boolean | no | Makes block not draggable |
| key | string | yes | key used to order items

Development

In order to develop the application or build android .apk from the sources one should:
1. Clone this repository
2. Install package dependencies with npm install
3. Navigate to example folder: cd example
3. Install example project dependencies npm install
3. Run Metro bundler with react-native start
4. Connect an emulator or physical device via adb, like this (tested with mEMU):
- adb connect 127.0.0.1:21503
- adb reverse tcp:8081 tcp:8081
5. Build and watch with react-native run-android`, changes from src directory are picked automatically because of example's metro and babel configurations.

Contributions

PR are always welcome!

Todos

* Better scroll-on-drag behaviour (smooth scroll without ugly timeouts and large scroll results in the dragged block trembling)
* Refactoring while perserving the performance
* Actual tests