[onDeviceUI] Adding on device addons.

addons/ondevice-backgrounds/README.md

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+# Storybook Addon On Device Backgrounds
+
+Storybook On Device Background Addon can be used to change background colors inside the the simulator in [Storybook](https://storybook.js.org).
+
+[Framework Support](https://github.com/storybooks/storybook/blob/master/ADDONS_SUPPORT.md)
+
+![Storybook Addon Backgrounds Demo](docs/demo.png)
+
+## Installation
+
+```sh
+npm i -D @storybook/addon-ondevice-backgrounds
+```
+
+## Configuration
+
+Then create a file called `rn-addons.js` in your storybook config.
+
+Add following content to it:
+
+```js
+import '@storybook/addon-ondevice-backgrounds/register';
+```
+
+Then import `rn-addons.js` next to your `getStorybookUI` call.
+```js
+import './rn-addons';
+```
+
+
+## Usage
+
+Then write your stories like this:
+
+```js
+import React from 'react';
+import { storiesOf } from '@storybook/react-native';
+import { withBackgrounds } from '@storybook/addon-ondevice-backgrounds';
+
+storiesOf('Button', module)
+  .addDecorator(
+    withBackgrounds([
+      { name: 'twitter', value: '#00aced', default: true },
+      { name: 'facebook', value: '#3b5998' },
+    ])
+  )
+  .add('with text', () => <Text>Click me</Text>);
+```
+
+You can add the backgrounds to all stories with `addDecorator` in `.storybook/config.js`:
+
+```js
+import { addDecorator } from '@storybook/react-native'; // <- or your storybook framework
+import { withBackgrounds } from '@storybook/addon-ondevice-backgrounds';
+
+addDecorator(
+  withBackgrounds([
+    { name: 'twitter', value: '#00aced', default: true },
+    { name: 'facebook', value: '#3b5998' },
+  ])
+);
+```
+
+If you want to override backgrounds for a single story or group of stories, pass the `backgrounds` parameter:
+
+```js
+import React from 'react';
+import { storiesOf } from '@storybook/react-native';
+
+storiesOf('Button', module)
+  .addParameters({
+    backgrounds: [
+      { name: 'red', value: '#F44336' },
+      { name: 'blue', value: '#2196F3', default: true },
+    ],
+  })
+  .add('with text', () => <button>Click me</button>);
+```
+
+If you don't want to use backgrounds for a story, you can set the `backgrounds` parameter to `[]`, or use `{ disable: true }` to skip the addon:
+
+```js
+import React from 'react';
+import { storiesOf } from '@storybook/react-native';
+
+storiesOf('Button', module).add('with text', () => <button>Click me</button>, {
+  backgrounds: { disable: true },
+});
+```

addons/ondevice-backgrounds/package.json

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+{
+  "name": "@storybook/addon-ondevice-backgrounds",
+  "version": "4.0.0-alpha.20",
+  "description": "A storybook addon to show different backgrounds for your preview",
+  "keywords": [
+    "addon",
+    "background",
+    "react",
+    "storybook"
+  ],
+  "homepage": "https://storybook.js.org",
+  "bugs": {
+    "url": "https://github.com/storybooks/storybook/issues"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/storybooks/storybook.git"
+  },
+  "license": "MIT",
+  "main": "dist/index.js",
+  "jsnext:main": "src/index.js",
+  "scripts": {
+    "prepare": "node ../../scripts/prepare.js"
+  },
+  "dependencies": {
+    "@storybook/addons": "4.0.0-alpha.20",
+    "prop-types": "^15.6.2"
+  },
+  "peerDependencies": {
+    "react": "*",
+    "react-native": "*"
+  }
+}

addons/ondevice-backgrounds/register.js

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+require('./dist/register');

addons/ondevice-backgrounds/src/BackgroundPanel.js

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+import React, { Component } from 'react';
+import PropTypes from 'prop-types';
+import { View, Text } from 'react-native';
+import Events from './constants';
+import Swatch from './Swatch';
+
+const defaultBackground = {
+  name: 'default',
+  value: 'transparent',
+};
+
+const instructionsHtml = `
+import { storiesOf } from '@storybook/react';
+import { withBackgrounds } from '@storybook/addon-backgrounds';
+
+storiesOf('First Component', module)
+  .addDecorator(withBackgrounds([
+    { name: 'twitter', value: '#00aced' },
+    { name: 'facebook', value: '#3b5998" },
+  ]))
+  .add("First Button", () => <button>Click me</button>);
+`.trim();
+
+const Instructions = () => (
+  <View>
+    <Text style={{ fontSize: 16 }}>Setup Instructions</Text>
+    <Text>
+      Please add the background decorator definition to your story. The background decorate accepts
+      an array of items, which should include a name for your color (preferably the css class name)
+      and the corresponding color / image value.
+    </Text>
+    <Text>
+      Below is an example of how to add the background decorator to your story definition.
+    </Text>
+    <Text>{instructionsHtml}</Text>
+  </View>
+);
+
+export default class BackgroundPanel extends Component {
+  constructor(props) {
+    super(props);
+
+    this.state = { backgrounds: [] };
+  }
+
+  componentDidMount() {
+    const { channel } = this.props;
+
+    this.onSet = channel.on(Events.SET, data => {
+      const backgrounds = [...data];
+
+      this.setState({ backgrounds });
+    });
+
+    this.onUnset = channel.on(Events.UNSET, () => {
+      this.setState({ backgrounds: [] });
+    });
+  }
+
+  componentWillUnmount() {
+    const { channel } = this.props;
+    channel.removeListener(Events.SET, this.onSet);
+    channel.removeListener(Events.UNSET, this.onUnset);
+  }
+
+  setBackgroundFromSwatch = background => {
+    this.update(background);
+  };
+
+  update(background) {
+    const { channel } = this.props;
+    channel.emit(Events.UPDATE_BACKGROUND, background);
+  }
+
+  render() {
+    const { active } = this.props;
+    const { backgrounds = [] } = this.state;
+
+    if (!active) {
+      return null;
+    }
+    if (!backgrounds.length) return <Instructions />;
+
+    const hasDefault = backgrounds.filter(x => x.default).length;
+    if (!hasDefault) backgrounds.push(defaultBackground);
+
+    return (
+      <View>
+        {backgrounds.map(({ value, name }) => (
+          <View key={`${name} ${value}`}>
+            <Swatch value={value} name={name} setBackground={this.setBackgroundFromSwatch} />
+          </View>
+        ))}
+      </View>
+    );
+  }
+}
+BackgroundPanel.propTypes = {
+  active: PropTypes.bool.isRequired,
+  api: PropTypes.shape({
+    getQueryParam: PropTypes.func,
+    setQueryParams: PropTypes.func,
+  }).isRequired,
+  channel: PropTypes.shape({
+    emit: PropTypes.func,
+    on: PropTypes.func,
+    removeListener: PropTypes.func,
+  }),
+};
+BackgroundPanel.defaultProps = {
+  channel: undefined,
+};

addons/ondevice-backgrounds/src/Swatch.js

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+import React from 'react';
+import PropTypes from 'prop-types';
+import { TouchableOpacity, View, Text } from 'react-native';
+
+const Swatch = ({ name, value, setBackground }) => (
+  <TouchableOpacity
+    style={{
+      borderRadius: 4,
+      borderWidth: 1,
+      borderColor: 'rgba(0,0,0,0.2)',
+      marginTop: 10,
+      marginBottom: 20,
+      marginHorizontal: 10,
+    }}
+    onPress={() => setBackground(value)}
+  >
+    <View style={{ flex: 1, backgroundColor: value, height: 40 }} />
+    <View style={{ padding: 4, flexDirection: 'row', justifyContent: 'space-between' }}>
+      <Text>{name}:</Text>
+      <Text>{value}</Text>
+    </View>
+  </TouchableOpacity>
+);
+Swatch.propTypes = {
+  name: PropTypes.string.isRequired,
+  value: PropTypes.string.isRequired,
+  setBackground: PropTypes.func.isRequired,
+};
+
+export default Swatch;

addons/ondevice-backgrounds/src/constants.js

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+export const ADDON_ID = 'storybook-addon-background';
+export const PANEL_ID = `${ADDON_ID}/background-panel`;
+
+export default {
+  SET: `${ADDON_ID}:set`,
+  UNSET: `${ADDON_ID}:unset`,
+  UPDATE_BACKGROUND: `${ADDON_ID}:update`,
+};

addons/ondevice-backgrounds/src/container.js

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+import React from 'react';
+import { View } from 'react-native';
+import PropTypes from 'prop-types';
+import Events from './constants';
+
+export default class Container extends React.Component {
+  constructor(props) {
+    super(props);
+    this.state = { background: props.initialBackground || '' };
+    this.onBackgroundChange = this.onBackgroundChange.bind(this);
+  }
+
+  componentDidMount() {
+    const { channel } = this.props;
+    // Listen to the notes and render it.
+    channel.on(Events.UPDATE_BACKGROUND, this.onBackgroundChange);
+  }
+
+  // This is some cleanup tasks when the Notes panel is unmounting.
+  componentWillUnmount() {
+    const { channel } = this.props;
+    channel.removeListener(Events.UPDATE_BACKGROUND, this.onBackgroundChange);
+  }
+
+  onBackgroundChange(background) {
+    this.setState({ background });
+  }
+
+  render() {
+    const { background } = this.state;
+    const { children } = this.props;
+
+    return (
+      <View style={{ flex: 1, backgroundColor: background || 'transparent' }}>{children}</View>
+    );
+  }
+}
+
+Container.propTypes = {
+  channel: PropTypes.shape({
+    emit: PropTypes.func,
+    on: PropTypes.func,
+    removeListener: PropTypes.func,
+  }),
+  initialBackground: PropTypes.string,
+  children: PropTypes.node.isRequired,
+};
+
+Container.defaultProps = {
+  channel: undefined,
+  initialBackground: '',
+};

addons/ondevice-backgrounds/src/index.js

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+import React from 'react';
+
+import addons, { makeDecorator } from '@storybook/addons';
+
+import Events from './constants';
+import Container from './container';
+
+export const withBackgrounds = makeDecorator({
+  name: 'withBackgrounds',
+  parameterName: 'backgrounds',
+  skipIfNoParametersOrOptions: true,
+  allowDeprecatedUsage: true,
+  wrapper: (getStory, context, { options, parameters }) => {
+    const data = parameters || options || [];
+    const backgrounds = Array.isArray(data) ? data : Object.values(data);
+
+    let background = 'transparent';
+    if (backgrounds.length !== 0) {
+      addons.getChannel().emit(Events.SET, backgrounds);
+
+      const defaultOrFirst = backgrounds.find(x => x.default) || backgrounds[0];
+
+      if (defaultOrFirst) {
+        background = defaultOrFirst.value;
+      }
+    }
+
+    return (
+      <Container initialBackground={background} channel={addons.getChannel()}>
+        {getStory(context)}
+      </Container>
+    );
+  },
+});

addons/ondevice-backgrounds/src/register.js

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+import React from 'react';
+import addons from '@storybook/addons';
+
+import { ADDON_ID, PANEL_ID } from './constants';
+import BackgroundPanel from './BackgroundPanel';
+
+addons.register(ADDON_ID, api => {
+  const channel = addons.getChannel();
+  addons.addPanel(PANEL_ID, {
+    title: 'Backgrounds',
+    // eslint-disable-next-line react/prop-types
+    render: ({ active }) => <BackgroundPanel channel={channel} api={api} active={active} />,
+  });
+});