react-native-bpk-appearance

Backpack React Native appearance.

Installation

npm install react-native-bpk-appearance --save-dev

Because this package ships with native code, it is also necessary to add some native dependencies to your RN project:

Android

Append |uiMode to the android:configChanges prop of <activity> in AndroidManifest.xml. Example:

<activity
    android:name=".MainActivity"
    android:exported="true"
    android:configChanges="keyboard|keyboardHidden|orientation|screenSize|uiMode">

Add the following configurations to gradle:

1. Define the react-native-bpk-appearance project in your settings.gradle file:

    include ':react-native-bpk-appearance'
    project(':react-native-bpk-appearance').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-bpk-appearance/src/android')

1. Add react-native-bpk-appearance as a dependency in your app/module build.gradle file:

    dependencies {
      implementation project(':react-native-bpk-appearance')
    }

If you have defined project-wide properties in your root build.gradle, this library will detect the presence of the following properties:

ext {
    compileSdkVersion   = 28
    targetSdkVersion    = 28
    minSdkVersion       = 21
    buildToolsVersion   = "28.0.3"
}

If you haven't or are using the pre compiled version bellow, it will use the values shown above.

Pre compiled version

Alternatively, the pre compiled version is available on Skyscanner's internal Artifactory. Make sure you have the infrastructure-maven registry configured and are logged in, then add the following dependency to your build.gradle file:

    dependencies {
      implementation 'net.skyscanner.backpack:react-native-bpk-appearance:<version>'
    }

Note: The version should be the same used for the npm package.

Importing the bridge package

After you have installed the lib, import the DialogPackage() in your react application:

import com.codemotionapps.reactnativedarkmode.DarkModePackage 
 
....
 
@Override
protected List<ReactPackage> getPackages() {
    return Arrays.<ReactPackage>asList(
            new MainReactPackage(),
            new DarkModePackage()
    );
}

iOS

Add a dependency to your Podfile using the path to the NPM package as follows:

  pod 'ReactNativeDarkMode', path: '../node_modules/react-native-bpk-appearance/node_modules/react-native-dark-mode/ReactNativeDarkMode.podspec'

Usage

First wrap your app with BpkAppearanceProvider

import {
  useBpkDynamicValue,
} from 'react-native-bpk-appearance';
 
const App = ({ children }) => (
  <BpkAppearanceProvider>
    <App>
      {children}
    </App>
  </BpkAppearanceProvider>
);

Now you can use the provided hooks to react to changes in the system appearance

import React from 'react';
import { View } from 'react-native';
import BpkImage from 'react-native-bpk-component-image';
import {
  BpkDynamicStyleSheet,
  useBpkDynamicStyleSheet,
  useBpkDynamicValue,
} from 'react-native-bpk-appearance';
import {
  backgroundDarkColor,
  backgroundLightColor,
} from 'bpk-tokens/tokens/base.react.native';
 
const style = BpkDynamicStyleSheet.create({
  view: {
    backgroundColor: { light: backgroundLightColor, dark: backgroundDarkColor }
  },
  image: {
    light: {
      borderWidth: 1,
      borderColor: '#d6d7da',
    },
    dark: {
      backgroundColor: 'rgb(205, 205, 215)'
    },
  },
});
 
const UserProfile = () => {
  const currentStyle = useBpkDynamicStyleSheet(style);
  const image = useBpkDynamicValue({ light: './user-profile-light.png', dark: './user-profile-dark.png' });
 
  return (
    <View style={currentStyle.view}>
      <BpkImage style={currentStyle.image} source={{ uri: image }} alt="user profile">
    </View>
  );
};

For non-functional components use BpkAppearanceConsumer or withBpkAppearance HOC and the unpack* functions. (See full in API section bellow).

BpkAppearanceConsumer usage

import React, { Component, type Config } from 'react';
import { View } from 'react-native';
import BpkText from 'react-native-bpk-component-text';
import {
  BpkDynamicStyleSheet,
  unpackBpkDynamicValue,
  BpkAppearanceConsumer,
} from 'react-native-bpk-appearance';
import {
  backgroundDarkColor,
  backgroundLightColor,
} from 'bpk-tokens/tokens/base.react.native';
 
const style = BpkDynamicStyleSheet.create({
  view: {
    backgroundColor: { light: backgroundLightColor, dark: backgroundDarkColor }
  }
});
 
type Props = {
  user: Object,
}
 
const defaultProps = {
  user: { guest: true }
};
 
class UserProfile extends Component<Props> {
  render() {
    const { user } = this.props;
 
    return (
      <BpkAppearanceConsumer>
        {({ bpkAppearance }) => {
          const currentStyle = unpackBpkDynamicValue(style, bpkAppearance);
          return (
            <View style={currentStyle.view}>
              <BpkText>{user.name}</BpkText>
            </View>
          )
        }}
      </BpkAppearanceConsumer>
    );
  }
};
 
export default BpkAppearanceConsumer;

withBpkAppearance usage

import React, { Component, type Config } from 'react';
import { View } from 'react-native';
import BpkText from 'react-native-bpk-component-text';
import {
  BpkDynamicStyleSheet,
  withBpkAppearance,
  unpackBpkDynamicValue,
  type WithBpkAppearanceInjectedProps,
} from 'react-native-bpk-appearance';
import {
  backgroundDarkColor,
  backgroundLightColor,
} from 'bpk-tokens/tokens/base.react.native';
 
const style = BpkDynamicStyleSheet.create({
  view: {
    backgroundColor: { light: backgroundLightColor, dark: backgroundDarkColor }
  }
});
 
type Props = {
  user: Object,
}
 
const defaultProps = {
  user: { guest: true }
};
 
class UserProfile extends Component<Props & WithBpkAppearanceInjectedProps> {
  render() {
    const { bpkAppearance, user } = this.props;
    const currentStyle = unpackBpkDynamicValue(style, bpkAppearance);
 
    return (
      <View style={currentStyle.view}>
        <BpkText>{user.name}</BpkText>
      </View>
    );
  }
};
 
type ComponentConfig = Config<Props, typeof defaultProps>;
export default withBpkAppearance<ComponentConfig>(UserProfile);

API

Table of Contents

• useBpkAppearance
• useBpkColorScheme
• useBpkDynamicValue
  • Parameters
  • Examples
• useBpkDynamicStyle
  • Parameters
  • Examples
• useBpkDynamicStyleSheet
  • Parameters
  • Examples
• BpkAppearanceConsumer
  • Parameters
  • Examples
• BpkDynamicStyleSheet
• create
  • Parameters
  • Examples
• withBpkAppearance
  • Parameters
  • Examples
• isBpkDynamicValue
  • Parameters
• unpackBpkDynamicValue
  • Parameters
  • Examples
• unpackBpkDynamicStyle
  • Parameters
  • Examples

useBpkAppearance

Fetch the current appearance as provided by the nearest [BpkAppearanceProvider]

Returns BpkAppearancePreferences the current appearance

useBpkColorScheme

Fetch the current color scheme as provided by the nearest [BpkAppearanceProvider]

Returns ColorSchemeName the current color scheme

useBpkDynamicValue

Takes in a BpkDynamicValue and returns the correct value for the current color scheme as provided by the nearest [BpkAppearanceProvider]

Parameters

• value Object a dynamic value.

Examples

const color = useBpkDynamicValue({ light: 'black', dark: 'white' })

Returns mixed the value for the current color scheme. If value is not a valid dynamic value it will be returned back

useBpkDynamicStyle

Takes in a style object and returns the correct value for all properties, based on the current color scheme as provided by the nearest [BpkAppearanceProvider]

Parameters

• style Object the style object

Examples

const color = useBpkDynamicStyle({
 color: { light: 'black', dark: 'white' },
 flex: 1,
});

Returns Object object with mapped properties for the current color scheme

useBpkDynamicStyleSheet

Takes in a BpkDynamicStyleSheet and returns the correct value for the current color scheme as provided by the nearest [BpkAppearanceProvider]

Parameters

• style BpkDynamicStyle the dynamic stylesheet

Examples

const dynamicStyles = BpkDynamicStyleSheet.create({
 color: { light: 'black', dark: 'white' },
 flex: 1,
})
const styles = useBpkDynamicStyleSheet(dynamicStyles);

Returns BpkDynamicStyleProp the current stylesheet

BpkAppearanceConsumer

• See: https://reactjs.org/docs/render-props.html

A render prop component that provides the current BpkAppearance as provided by the nearest [BpkAppearanceProvider].

NOTE: This component should mainly be used in class components, for functional components we recommend using the provided hooks.

Parameters

• children Function Function that will receive the current appearance and should return a react Node.
  • children.children

Examples

<BpkAppearanceConsumer>
  {({ bpkAppearance }) => {
   const logo = unpackDynamicValue({ light: 'light.png', dark: 'dark.png' }, bpkAppearance);
   return <BpkImage style={styles.image} alt="image title" source={{uri: logo}} />
  }}
</BpkAppearanceConsumer>

Returns Node a react Node.

BpkDynamicStyleSheet

create

Creates a new dynamic stylesheet that transforms all BpkDynamicValues into a plain StyleSheet for each color scheme.

This should generally be used in conjunction with useBpkDynamicStyleSheet hook.

Parameters

• obj Object a style containing dynamic values

Examples

BpkDynamicStyleSheet.create({
  view: {
    shadowColor: { light: '#fff', dark: '#ff0' },
  }
});

BpkDynamicStyleSheet.create({
  view: {
    light: {
      borderWidth: 1,
      borderColor: '#d6d7da',
    },
    dark: {
      backgroundColor: 'rgb(205, 205, 215)'
    },
  }
});

Returns BpkDynamicStyle an object containing a plain stylesheet for each color scheme.

withBpkAppearance

This HOC wraps a component and provides the current BpkAppearancePreferences as provided by the nearest BpkAppearanceProvider.

NOTE: If you are using a functional component use one of the provided hooks instead.

Parameters

• Component Component the component to be wrapped

Examples

import React, { type Config } from 'react';
import { type WithBpkAppearanceInjectedProps, withBpkAppearance } from 'react-native-bpk-appearance';
 
class MyComponent extends Component<Props & WithBpkAppearanceInjectedProps> {
 render() {
   const { bpkAppearance, ...rest } = this.props;
   ....
 }
}
 
export default withBpkAppearance<Config<Props, DefaultProps>>(MyComponent);

Returns Component the wrapped component with an extra bpkAppearance prop.

isBpkDynamicValue

Check if a value is a BpkDynamicValue

Parameters

• value mixed the value to be checked

Returns boolean true if is a BpkDynamicValue or false otherwise

unpackBpkDynamicValue

Takes in a BpkDynamicValue and returns the correct value for provided appearance.

Parameters

• value mixed a dynamic value.
• appearance Object the appearance preferences.

Examples

const color = unpackBpkDynamicValue({ light: 'black', dark: 'white' }, bpkAppearance)

Returns mixed the value for the current color scheme. If value is not a valid dynamic value it will be returned back

unpackBpkDynamicStyle

Takes in a style object and returns the correct value for all properties, based on the current color scheme as provided by the nearest [BpkAppearanceProvider]

Parameters

• style Object the style object
• appearance Object the appearance preferences.

Examples

const style = unpackBpkDynamicStyle(
 {
   color: { light: 'black', dark: 'white' },
   flex: 1,
 },
 appearance
);

Returns Object object with mapped properties for the current color scheme