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https://github.com/jmurzy/react-native-foldview

FoldView implemented in JavaScript ⛱
https://github.com/jmurzy/react-native-foldview

react-native

Last synced: 26 days ago
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FoldView implemented in JavaScript ⛱

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# React Native FoldView [![Medium](https://img.shields.io/badge/blog-medium-brightgreen.svg)](https://commitocracy.com/implementing-foldview-in-react-native-e970011f98b8) [![CircleCI](https://img.shields.io/circleci/project/jmurzy/react-native-foldview/master.svg?style=flat-square)](https://circleci.com/gh/jmurzy/react-native-foldview) [![npm version](https://img.shields.io/npm/v/react-native-foldview.svg?style=flat-square)](https://www.npmjs.com/package/react-native-foldview) [![npm](https://img.shields.io/npm/l/react-native-foldview.svg?style=flat-square)](https://github.com/jmurzy/react-native-foldview/blob/master/LICENSE.md)



FoldingCell implementation in JavaScript. This project was inspired by the folding cell animation seen on [Dribbble](https://dribbble.com/shots/2121350-Delivery-Card).






#### Questions?

Feel free to reach out to me on Twitter [@jmurzy](https://twitter.com/jmurzy).



### Read it on Medium

To learn more about how FoldView was implemented, check out the article on Medium: [Implementing FoldView in React Native](https://commitocracy.com/implementing-foldview-in-react-native-e970011f98b8).



### Example

The demo app from the GIF can be found at `examples/Simple`.



To build and run the example app:



```bash

git clone https://github.com/jmurzy/react-native-foldview



cd react-native-foldview/examples/Simple

npm install

```



To deploy to iOS simulator:



```bash

npm run ios

```



### Installation



#### Using npm:



```sh

$ npm install --save react-native-foldview

```



#### Using yarn:



```sh

$ yarn add react-native-foldview

```



### Usage



```jsx

import React, { Component } from 'react';



import FoldView from 'react-native-foldview';



const Frontface = (props) => (/*...*/);

const Backface = (props) => (/*...*/);

const Base = (props) => (/*...*/);



export default class Row extends Component {



  constructor(props) {

    super(props);



    this.state = {

      expanded: false,

    };

  }



  componentWillMount() {

    this.flip = this.flip.bind(this);

  }



  flip() {

    this.setState({

      expanded: !this.state.expanded,

    });

  }



  renderFrontface() {

    return (

      

    );

  }



  renderBackface() {

    /**

     * You can nest s here to achieve the folding effect shown in the GIF above.

     * A reference implementation can be found in examples/Simple.

     */

    return (

      

    );

  }



  render() {

    return (

      

        

      

    );

  }

}



```



#### Props



| Prop | Type | Description |

|---|---|---|

|**`children`**|`ReactElement`|React Element(s) to render.|

|**`flipDuration`**|`?number`|Length of flip animation in milliseconds. _Default 280._|

|**`renderBackface`**|`() => ReactElement`|Callback that renders a backface.|

|**`renderFrontface`**|`() => ReactElement`|Callback that renders a frontface.|

|**`renderLoading`**|`?() => ReactElement`|Callback that renders a temporary view to display before base layout occurs. If not provided, `renderFrontface` is used instead.|



#### Root-only Props



FoldViews can be nested. The following props can only be set on the root `FoldView`.



| Prop | Type | Description |

|---|---|---|

|**`collapse`**|`?(foldviews: Array) => Promise`|Called when FoldView should collapse allowing you to have control over which FoldViews(s) to collapse. Default behavior is to wait until a FoldView is collapsed before collapsing the next one.|

|**`expand`**|`?(foldviews: Array) => Promise`|Called when FoldView should expand allowing you to have control over which FoldView(s) to expand. Default behavior is to wait until a FoldView is expanded before expanding the next one.|

|**`expanded`**|`boolean`|Allows you to expand and collapse the FoldView content.|

|**`onAnimationEnd`**|`?(duration: number, height: number) => void`|Called when a collapse animation ends.|

|**`onAnimationStart`**|`?(duration: number, height: number) => void`|Called before an expand animation starts.|

|**`perspective`**|`?number`|Defines the space within which the 3D animation occurs.|



### Advanced Usage

You can customize the behavior of expand and collapse animations using the `expand` and `collapse` props on the root `FoldView`. For example, it's very much possible to collapse all FoldViews in a given stack altogether rather than one by one. You can do so as follows:



```jsx

const collapse = async (foldViews) => {

  /**

   * Internally, FoldView turns off rasterization when collapsed as an optimization to decrease

   * memory usage. It's important to wrap your calls in a `Promise` here to avoid early disabling

   * of rasterization.

   */

  await Promise.all(foldViews.map(foldView => foldView.collapse()));

}



  { /* ... */ }



```



### Platform Support

This library heavily depends on the `overflow` style property. Unfortunately, `overflow` defaults to `hidden` on Android and cannot be changed. Although it looks like a [possible](https://github.com/facebook/react-native/issues/3198#issuecomment-241867280) [fix](https://github.com/facebook/react-native/tree/master/ReactAndroid/src/main/java/com/facebook/react/flat) is in the making, currently, FoldingView is only supported on iOS.



### Contributing

Contributions are very welcome: bug fixes, features, documentation, tests. Just make sure the CI is 👌.



#### Hacking



Unfortunately, React Native packager does not support symlinking so you cannot use [`npm link`](https://docs.npmjs.com/cli/link) when hacking on this library. You can learn more about that, [here](https://productpains.com/post/react-native/symlink-support-for-packager/).



The library code is specified as a [local dependency](local dependency) in the example's `package.json`. In order to hack on the library code, you need to sync it into `examples/Simple/node_modules`. To do so, run:



```js

npm run watch

```



This will automatically watch the `src` directory and sync your changes into `examples/Simple/node_modules` every time something changes.



#### License



All pull requests that get merged will be made available under [the MIT license](https://github.com/jmurzy/react-native-foldview/blob/master/LICENSE.md), as the rest of the repository.