react-native-themed

Installation

yarn add react-native-themed

or

npm i react-native-themed

Usage

1. Provide theme context, and define theme mode for context value.

import { ThemeProvider } from 'react-native-themed';

function App() {
  // mode can be any valid string，usually we use 'light' and 'dark' to present system appearance.
  const mode = 'dark';
  return (
    <ThemeProvider value={mode}>
      <YourProjectComponent />
    </ThemeProvider>
  )
}

2. Create palette to adapt colors for different themes.

import { createPalette } from 'react-native-themed';

const LightBaseColors = {
  primaryBackground: '#fff',
  primaryFont: '#41464b',
};

const DarkBaseColors = {
  primaryBackground: 'rgb(40, 40, 40)',
  primaryFont: 'rgb(199, 199, 199)'
};

export const BaseColors = createPalette({
  'light': LightBaseColors,
  'dark': DarkBaseColors
});

3. Replace components Themed components

import Themed from 'react-native-themed';


<Themed.View style={{ flex: 1, backgroundColor: BaseColors.primaryBackground }}>
  <Themed.Text style={{ color: BaseColors.primaryFont }}>Text</Themed.Text>
</Themed.View>

API

• ThemeProvider

import { ThemeProvider } from 'react-native-themed';


class ProvideThemeForApp extends Class {
  return (
    <ThemeProvider>
      <App />
    </ThemeProvider>
  )
}

Provide themed context for a react child.

• createPalette

Create palette with a combination of Themed.Values.

import Themed, { createPalette } from 'react-native-themed';

const LightBaseColors = {
  primaryBackground: '#fff',
  primaryFont: '#41464b',
};

const DarkBaseColors = {
  primaryBackground: 'rgb(40, 40, 40)',
  primaryFont: 'rgb(199, 199, 199)'
};


export const BasePalette = createPalette({
  'light': LightBaseColors,
  'dark': DarkBaseColors
});

// This is equal to: 

export const BasePalette = {
  primaryBackground: new Themed.Value({
    light: '#fff',
    dark: 'rgb(40, 40, 40)'
  }),
  primaryFont: new Themed.Value({
    light: '#41464b',
    dark: 'rgb(199, 199, 199)'
  }),
}

---

• createThemedComponent

function createThemedComponent<P, S extends object>(Component: ComponentType<PropsWithChildren<P>>, transformer?: (props: PropsWithChildren<ThemeProps<S, P>>, mode: string) => PropsWithChildren<P>)

Create a component with themed context, it will automatically transform Themed.Values inside props into theme matched result.

import { View } from 'react-native';
import createThemedComponent from '../createThemedComponent';

const ThemedView = createThemedComponent(View);


/**
 * <ThemedView style={{ backgroundColor: new Themed.Value({ dark: 'white', light: 'black' }) }} />
 */

createThemedComponent takes a second optional argument: transformer?: (props: PropsWithChildren<ThemeProps<S, P>>, mode: string) => PropsWithChildren<P>. If the Themed.Value is nested inside prop value, using transformer could transform the prop properly.

Let's take (LinearGradient)[https://github.com/react-native-community/react-native-linear-gradient] as an example

import LinearGradient from 'react-native-linear-gradient';
import createThemedComponent, { transformValue, transformStyle } from '../createThemedComponent';

const ThemedLinearGradient = createThemedComponent(LinearGradient, (props) => {
  return {
    ...props,
    style: transformStyle(props.style),
    colors: props.colors ? props.colors.map((color) => {
      return transformValue(color);
    }) : props.colors
  }
});

Then the ThemedLinearGradient component can use Themed.Value inside style prop and colors prop.

<ThemedLinearGradient
  style={{
    borderColor: new Theme.Value({
      light: 'red',
      dark: 'blue'
    }),
    borderWidth: 2
  }}
  colors=[
    new Theme.Value({
      light: '#f00',
      dark: '#ff0'
    }),
    new Theme.Value({
      light: '#0ff',
      dark: '#00f'
    })
  ]
/>

---

• Themed.Value

Themed.Value({ [theme: string]: any })

---

• Preset themed components support

• Themed.ActivityIndicator,

• Themed.Button,

• Themed.FlatList,

• Themed.ScrollView,

• Themed.RefreshControl,

• Themed.View,

• Themed.Text,

• Themed.TextInput

• Themed.Image,

• Themed.TouchableHighlight

• Themed.TouchableOpacity