Options for selecting dark theme, fix some white flashes when in dark mode (#2722)

* add dark theme selection to settings/schema

* use `useThemePrefs` where needed

* adjust theme providers to support various themes

* update storybook

* handle web themes

* better themeing for web

* dont show dark theme prefs when color mode is light

* drop the inverted text change on oled theme

* get the color mode inside of `useColorModeTheme`

* use `ThemeName` type everywhere

* typo

* use dim/dark instead of dark/oled

* prevent any fickers on web

* fix styles

* use `dim` for dark default

* more cleanup

* 🤔

* set system background color

* ts

src/state/shell/color-mode.tsx

@@ -1,57 +1,65 @@
 import React from 'react'
-import {isWeb} from '#/platform/detection'
 import * as persisted from '#/state/persisted'
 
-type StateContext = persisted.Schema['colorMode']
-type SetContext = (v: persisted.Schema['colorMode']) => void
+type StateContext = {
+  colorMode: persisted.Schema['colorMode']
+  darkTheme: persisted.Schema['darkTheme']
+}
+type SetContext = {
+  setColorMode: (v: persisted.Schema['colorMode']) => void
+  setDarkTheme: (v: persisted.Schema['darkTheme']) => void
+}
 
-const stateContext = React.createContext<StateContext>('system')
-const setContext = React.createContext<SetContext>(
-  (_: persisted.Schema['colorMode']) => {},
-)
+const stateContext = React.createContext<StateContext>({
+  colorMode: 'system',
+  darkTheme: 'dark',
+})
+const setContext = React.createContext<SetContext>({} as SetContext)
 
 export function Provider({children}: React.PropsWithChildren<{}>) {
-  const [state, setState] = React.useState(persisted.get('colorMode'))
+  const [colorMode, setColorMode] = React.useState(persisted.get('colorMode'))
+  const [darkTheme, setDarkTheme] = React.useState(persisted.get('darkTheme'))
 
-  const setStateWrapped = React.useCallback(
-    (colorMode: persisted.Schema['colorMode']) => {
-      setState(colorMode)
-      persisted.write('colorMode', colorMode)
-      updateDocument(colorMode)
+  const setColorModeWrapped = React.useCallback(
+    (_colorMode: persisted.Schema['colorMode']) => {
+      setColorMode(_colorMode)
+      persisted.write('colorMode', _colorMode)
     },
-    [setState],
+    [setColorMode],
+  )
+
+  const setDarkThemeWrapped = React.useCallback(
+    (_darkTheme: persisted.Schema['darkTheme']) => {
+      setDarkTheme(_darkTheme)
+      persisted.write('darkTheme', _darkTheme)
+    },
+    [setDarkTheme],
   )
 
   React.useEffect(() => {
-    updateDocument(persisted.get('colorMode')) // set on load
     return persisted.onUpdate(() => {
-      setState(persisted.get('colorMode'))
-      updateDocument(persisted.get('colorMode'))
+      setColorModeWrapped(persisted.get('colorMode'))
+      setDarkThemeWrapped(persisted.get('darkTheme'))
     })
-  }, [setState])
+  }, [setColorModeWrapped, setDarkThemeWrapped])
 
   return (
-    <stateContext.Provider value={state}>
-      <setContext.Provider value={setStateWrapped}>
+    <stateContext.Provider value={{colorMode, darkTheme}}>
+      <setContext.Provider
+        value={{
+          setDarkTheme: setDarkThemeWrapped,
+          setColorMode: setColorModeWrapped,
+        }}>
         {children}
       </setContext.Provider>
     </stateContext.Provider>
   )
 }
 
-export function useColorMode() {
+export function useThemePrefs() {
   return React.useContext(stateContext)
 }
 
-export function useSetColorMode() {
+export function useSetThemePrefs() {
   return React.useContext(setContext)
 }
-
-function updateDocument(colorMode: string) {
-  if (isWeb && typeof window !== 'undefined') {
-    const html = window.document.documentElement
-    // remove any other color mode classes
-    html.className = html.className.replace(/colorMode--\w+/g, '')
-    html.classList.add(`colorMode--${colorMode}`)
-  }
-}

src/state/shell/index.tsx

@@ -14,7 +14,7 @@ export {
   useSetDrawerSwipeDisabled,
 } from './drawer-swipe-disabled'
 export {useMinimalShellMode, useSetMinimalShellMode} from './minimal-mode'
-export {useColorMode, useSetColorMode} from './color-mode'
+export {useThemePrefs, useSetThemePrefs} from './color-mode'
 export {useOnboardingState, useOnboardingDispatch} from './onboarding'
 export {useComposerState, useComposerControls} from './composer'
 export {useTickEveryMinute} from './tick-every-minute'