bsky-app/src/lib/ThemeContext.tsx
2023-09-15 11:00:06 -05:00

136 lines
3 KiB
TypeScript

import {isWeb} from 'platform/detection'
import React, {ReactNode, createContext, useContext} from 'react'
import {
AppState,
TextStyle,
useColorScheme as useColorScheme_BUGGY,
ViewStyle,
ColorSchemeName,
} from 'react-native'
import {darkTheme, defaultTheme} from './themes'
export type ColorScheme = 'light' | 'dark'
export type PaletteColorName =
| 'default'
| 'primary'
| 'secondary'
| 'inverted'
| 'error'
export type PaletteColor = {
background: string
backgroundLight: string
text: string
textLight: string
textInverted: string
link: string
border: string
borderDark: string
icon: string
[k: string]: string
}
export type Palette = Record<PaletteColorName, PaletteColor>
export type ShapeName = 'button' | 'bigButton' | 'smallButton'
export type Shapes = Record<ShapeName, ViewStyle>
export type TypographyVariant =
| '2xl-thin'
| '2xl'
| '2xl-medium'
| '2xl-bold'
| '2xl-heavy'
| 'xl-thin'
| 'xl'
| 'xl-medium'
| 'xl-bold'
| 'xl-heavy'
| 'lg-thin'
| 'lg'
| 'lg-medium'
| 'lg-bold'
| 'lg-heavy'
| 'md-thin'
| 'md'
| 'md-medium'
| 'md-bold'
| 'md-heavy'
| 'sm-thin'
| 'sm'
| 'sm-medium'
| 'sm-bold'
| 'sm-heavy'
| 'xs-thin'
| 'xs'
| 'xs-medium'
| 'xs-bold'
| 'xs-heavy'
| 'title-2xl'
| 'title-xl'
| 'title-lg'
| 'title'
| 'title-sm'
| 'post-text-lg'
| 'post-text'
| 'button'
| 'button-lg'
| 'mono'
export type Typography = Record<TypographyVariant, TextStyle>
export interface Theme {
colorScheme: ColorScheme
palette: Palette
shapes: Shapes
typography: Typography
}
export interface ThemeProviderProps {
children?: ReactNode
theme?: 'light' | 'dark' | 'system'
}
export const ThemeContext = createContext<Theme>(defaultTheme)
export const useTheme = () => useContext(ThemeContext)
function getTheme(theme: ColorSchemeName) {
return theme === 'dark' ? darkTheme : defaultTheme
}
/**
* With RN iOS, we can only "trust" the color scheme reported while the app is
* active. This is a workaround until the bug is fixed upstream.
*
* @see https://github.com/bluesky-social/social-app/pull/1417#issuecomment-1719868504
* @see https://github.com/facebook/react-native/pull/39439
*/
function useColorScheme_FIXED() {
const colorScheme = useColorScheme_BUGGY()
const [currentColorScheme, setCurrentColorScheme] =
React.useState<ColorSchemeName>(colorScheme)
React.useEffect(() => {
// we don't need to be updating state on web
if (isWeb) return
const subscription = AppState.addEventListener('change', state => {
const isActive = state === 'active'
if (!isActive) return
setCurrentColorScheme(colorScheme)
})
return () => subscription.remove()
}, [colorScheme])
return isWeb ? colorScheme : currentColorScheme
}
export const ThemeProvider: React.FC<ThemeProviderProps> = ({
theme,
children,
}) => {
const colorScheme = useColorScheme_FIXED()
const themeValue = getTheme(theme === 'system' ? colorScheme : theme)
return (
<ThemeContext.Provider value={themeValue}>{children}</ThemeContext.Provider>
)
}