Introduce default dark theme

docs/Admin.md

@@ -145,7 +145,7 @@ Here are all the props accepted by the component:
 | `basename`         | Optional | `string`       | -              | The base path for all URLs                               |
 | `catchAll`         | Optional | `Component`    | `NotFound`     | The fallback component for unknown routes                |
 | `dashboard`        | Optional | `Component`    | -              | The content of the dashboard page                        |
-| `darkTheme`        | Optional | `object`       | -              | The dark theme configuration                             |
+| `darkTheme`        | Optional | `object`       | `default DarkTheme` (the default built-in dark theme)              | The dark theme configuration                             |
 | `defaultTheme`     | Optional | `boolean`      | `false`        | Flag to default to the light theme                       |
 | `disableTelemetry` | Optional | `boolean`      | `false`        | Set to `true` to disable telemetry collection            |
 | `i18nProvider`     | Optional | `I18NProvider` | -              | The internationalization provider for translations       |
@@ -156,7 +156,7 @@ Here are all the props accepted by the component:
 | `ready`            | Optional | `Component`    | `Ready`        | The content of the ready page                            |
 | `requireAuth`      | Optional | `boolean`      | `false`        | Flag to require authentication for all routes            |
 | `store`            | Optional | `Store`        | -              | The Store for managing user preferences                  |
-| `theme`            | Optional | `object`       | -              | The main (light) theme configuration                     |
+| `theme`            | Optional | `object`       | `defaultLightTheme` (the default built-in light theme)              | The main (light) theme configuration                     |
 | `title`            | Optional | `string`       | -              | The error page title                                     |
 
 
@@ -433,29 +433,48 @@ const App = () => (
 
 ## `darkTheme`
 
-If you want to support both light and dark mode, you can provide a `darkTheme` in addition to the `theme` prop. The app will use the `darkTheme` by default for users who prefer the dark mode at the OS level, and users will be able to switch from light to dark mode using a new app bar button leveraging [the `<ToggleThemeButton>` component](./ToggleThemeButton.md).
+React-admin provides a [built-in dark theme](./AppTheme.md#default). The app will use the `darkTheme` by default for users who prefer the dark mode at the OS level, and users will be able to switch from light to dark mode using [the `<ToggleThemeButton>` component](./ToggleThemeButton.md).
 
 <video controls autoplay muted loop>
   <source src="./img/ToggleThemeButton.webm" type="video/webm"/>
   Your browser does not support the video tag.
 </video>
 
+If you want to override it, you can provide your own `darkTheme` in addition to the `theme` prop:
+
 ```tsx
 import { Admin } from 'react-admin';
 import { dataProvider } from './dataProvider';
-import { darkTheme, lightTheme } from './themes';
+import { myDarkTheme } from './themes';
 
 const App = () => (
     <Admin
         dataProvider={dataProvider}
-        theme={lightTheme}
-        darkTheme={darkTheme}
+        darkTheme={myDarkTheme}
+    >
+        ...
+    </Admin>
+);
+```
+
+If you want to remove the user's ability to switch to dark theme, you can set `darkTheme` to `null`, therefore the `<ToggleThemeButton>` component won't be shown: 
+
+```tsx
+import { Admin } from 'react-admin';
+import { dataProvider } from './dataProvider';
+
+const App = () => (
+    <Admin
+        dataProvider={dataProvider}
+        darkTheme={null}
     >
         ...
     </Admin>
 );
 ```
 
+If the `theme` prop is provided and the `darkTheme` prop is not, the dark theme is disabled.
+
 **Tip**: To disable OS preference detection and always use one theme by default, see the [`defaultTheme`](#defaulttheme) prop.
 
 ## `defaultTheme`
@@ -843,7 +862,7 @@ const App = () => (
 
 You can also [write your own theme](./AppTheme.md#writing-a-custom-theme) to fit your company branding. For more details on predefined and custom themes, refer to [the Application Theme chapter](./AppTheme.md).
 
-If you want to support both a light and a dark theme, check out [the `<Admin darkTheme>` prop](#darktheme). 
+React-admin provides a [built-in dark theme by default](./AppTheme.md#default). If you want to override it, check out [the `<Admin darkTheme>` prop](#darktheme). 
 
 ## `title`
 

docs/AppBar.md

@@ -18,7 +18,7 @@ By default, the `<AppBar>` component displays:
 - a hamburger icon to toggle the sidebar width,
 - the page title,
 - a button to change locales (if the application uses [i18n](./Translation.md)),
-- a button to change the theme (if the application uses a [dark theme](./Admin.md#darktheme)),
+- a button to change the theme (unless the [dark theme](./Admin.md#darktheme) is disabled),
 - a loading indicator,
 - a button to display the user menu.
 

docs/AppTheme.md

@@ -60,14 +60,17 @@ It's a common practice to support both a light theme and a dark theme in an appl
   Your browser does not support the video tag.
 </video>
 
+React-admin provides a [built-in dark theme by default](#default), the default application theme depends on the user's system settings. If the user has chosen a dark mode in their OS, react-admin will use the dark theme. Otherwise, it will use the light theme.
 
-React-admin's `<Admin>` component accepts a `darkTheme` prop in addition to the `theme` prop. 
+In addition, users can switch from one theme to the other using [the `<ToggleThemeButton>` component](./ToggleThemeButton.md), that appears in the AppBar as soon as you define a `darkTheme` prop.  
 
-```jsx
-import { Admin, defaultTheme } from 'react-admin';
+You can override the dark theme by setting the `<Admin>`'s `darkTheme` prop with your own theme:
 
-const lightTheme = defaultTheme;
-const darkTheme = { ...defaultTheme, palette: { mode: 'dark' } };
+```tsx
+import { Admin, defaultDarkTheme, defaultLightTheme } from 'react-admin';
+
+const lightTheme = defaultLightTheme;
+const darkTheme = { ...defaultDarkTheme, palette: { mode: 'dark' } };
 
 const App = () => (
     <Admin
@@ -80,9 +83,15 @@ const App = () => (
 );
 ```
 
-With this setup, the default application theme depends on the user's system settings. If the user has chosen a dark mode in their OS, react-admin will use the dark theme. Otherwise, it will use the light theme.
+**Tip**: If you don't need the default dark theme, you can set the `<Admin>`'s `darkTheme` prop to `null`:
 
-In addition, users can switch from one theme to the other using [the `<ToggleThemeButton>` component](./ToggleThemeButton.md), which appears in the AppBar as soon as you define a `darkTheme` prop.
+```tsx
+const App = () => (
+    <Admin darkTheme={null}>
+        // ...
+    </Admin>
+);
+``` 
 
 ## Built-In Themes
 

docs/ToggleThemeButton.md

@@ -13,7 +13,7 @@ The `<ToggleThemeButton>` component lets users switch from light to dark mode, a
   Your browser does not support the video tag.
 </video>
 
-It is enabled by default in the `<AppBar>` as soon as you define a dark theme via [the `<Admin darkTheme>` prop](./Admin.md#darktheme).
+It is enabled by default in the `<AppBar>` as React-admin provides a [built-in dark theme](./AppTheme.md#default).  
 
 ## Usage
 
@@ -52,10 +52,23 @@ const App = () => (
 
 ## Removing The Button From The AppBar
 
-The `<ToggleThemeButton>` appears by default in the `<AppBar>` if the `<Admin darkTheme>` prop is defined. If you want to remove it, you need to set a custom [`<AppBar toolbar>` prop](./AppBar.md#toolbar):
+The `<ToggleThemeButton>` appears by default in the `<AppBar>`. If you want to remove it, you have two solutions:
 
-```jsx
-// in src/MyAppBar.js
+- you can set the `<Admin>` `darkTheme` prop to `null`:
+
+```tsx
+// in src/App.tsx
+const App = () => (
+    <Admin darkTheme={null}>
+        // ...
+    </Admin>
+);
+``` 
+
+- or you can set a custom [`<AppBar toolbar>` prop](./AppBar.md#toolbar):
+
+```tsx
+// in src/MyAppBar.tsx
 import { AppBar, LocalesMenuButton, RefreshIconButton } from 'react-admin';
 
 export const MyAppBar = () => (
@@ -71,7 +84,9 @@ export const MyAppBar = () => (
 
 ## Creating A Dark Theme
 
-For this button to work, you must provide a dark theme to the `<Admin>` component. The `darkTheme` should be a JSON object that follows the [Material UI theme specification](https://material-ui.com/customization/theming/).
+For this button to work, you must provide a dark theme to the `<Admin>` component. React-admin provides a [built-in dark theme](./AppTheme.md#default), but you can override it according to your needs.
+
+The `darkTheme` should be a JSON object that follows the [Material UI theme specification](https://material-ui.com/customization/theming/).
 
 You can create such a theme from scratch:
 

docs/Upgrade.md

@@ -18,6 +18,28 @@ If you previously relied on the fact that the rows were not clickable by default
 </Datagrid>
 ```
 
+## Dark Theme Is Available By Default
+
+In addition to the light theme, React-admin v5 includes a [dark theme](https://marmelab.com/react-admin/AppTheme.html#light-and-dark-themes), renders a theme switcher in the app bar, and chooses the default theme based on the user OS preferences. 
+
+If you don't need the dark mode feature, you'll have to explicitly disable it:
+
+```diff
+-<Admin>
++<Admin darkTheme={null}>
+   ...
+</Admin>
+```
+
+If the `theme` prop is defined but not the `darkTheme` prop, theme switcher button in the app bar isn't displayed:
+
+```diff
+-<Admin>
++<Admin theme={myMainTheme}>
+   ...
+</Admin>
+```
+
 ## Upgrading to v4
 
 If you are on react-admin v3, follow the [Upgrading to v4](https://marmelab.com/react-admin/doc/4.16/Upgrade.html) guide before upgrading to v5. 

packages/ra-ui-materialui/src/AdminContext.spec.tsx

@@ -1,22 +1,20 @@
 import * as React from 'react';
 import { render, screen } from '@testing-library/react';
-import { Typography, ThemeOptions } from '@mui/material';
+import { Typography } from '@mui/material';
 import expect from 'expect';
 import { memoryStore } from 'ra-core';
 
 import { AdminContext } from './AdminContext';
 import { ThemeTestWrapper } from './layout/ThemeTestWrapper';
-
-const lightTheme: ThemeOptions = {};
-const darkTheme: ThemeOptions = { palette: { mode: 'dark' } };
+import { defaultLightTheme } from './theme';
 
 const LIGHT_MODE_TEXT_COLOR = 'rgb(25, 118, 210)'; // text is dark blue in light mode
 const DARK_MODE_TEXT_COLOR = 'rgb(144, 202, 249)'; // text is light blue in dark mode
 
 describe('AdminContext', () => {
     it('should default to light theme', () => {
         render(
-            <AdminContext theme={lightTheme} darkTheme={darkTheme}>
+            <AdminContext>
                 <Typography color="primary">Test</Typography>
             </AdminContext>
         );
@@ -26,7 +24,7 @@ describe('AdminContext', () => {
     it('should default to dark theme when the browser detects a dark mode preference', () => {
         render(
             <ThemeTestWrapper mode="dark">
-                <AdminContext theme={lightTheme} darkTheme={darkTheme}>
+                <AdminContext>
                     <Typography color="primary">Test</Typography>
                 </AdminContext>
             </ThemeTestWrapper>
@@ -37,7 +35,7 @@ describe('AdminContext', () => {
     it('should default to light theme when the browser detects a dark mode preference', () => {
         render(
             <ThemeTestWrapper mode="light">
-                <AdminContext theme={lightTheme} darkTheme={darkTheme}>
+                <AdminContext>
                     <Typography color="primary">Test</Typography>
                 </AdminContext>
             </ThemeTestWrapper>
@@ -47,11 +45,7 @@ describe('AdminContext', () => {
     });
     it('should default to dark theme when user preference is dark', () => {
         render(
-            <AdminContext
-                theme={lightTheme}
-                darkTheme={darkTheme}
-                store={memoryStore({ theme: 'dark' })}
-            >
+            <AdminContext store={memoryStore({ theme: 'dark' })}>
                 <Typography color="primary">Test</Typography>
             </AdminContext>
         );
@@ -61,11 +55,18 @@ describe('AdminContext', () => {
     it('should default to light theme when user preference is light', () => {
         render(
             <ThemeTestWrapper mode="dark">
-                <AdminContext
-                    theme={lightTheme}
-                    darkTheme={darkTheme}
-                    store={memoryStore({ theme: 'light' })}
-                >
+                <AdminContext store={memoryStore({ theme: 'light' })}>
+                    <Typography color="primary">Test</Typography>
+                </AdminContext>
+            </ThemeTestWrapper>
+        );
+        const text = screen.getByText('Test');
+        expect(getComputedStyle(text).color).toBe(LIGHT_MODE_TEXT_COLOR);
+    });
+    it('should only use main theme even the browser detects a dark mode preference', () => {
+        render(
+            <ThemeTestWrapper mode="dark">
+                <AdminContext theme={defaultLightTheme}>
                     <Typography color="primary">Test</Typography>
                 </AdminContext>
             </ThemeTestWrapper>

packages/ra-ui-materialui/src/AdminContext.tsx

@@ -6,6 +6,7 @@ import {
     ThemesContext,
     RaThemeOptions,
     defaultLightTheme,
+    defaultDarkTheme,
 } from './theme';
 
 export const AdminContext = (props: AdminContextProps) => {
@@ -22,7 +23,12 @@ export const AdminContext = (props: AdminContextProps) => {
             <ThemesContext.Provider
                 value={{
                     lightTheme: theme || lightTheme,
-                    darkTheme,
+                    darkTheme:
+                        theme && !darkTheme
+                            ? null
+                            : !darkTheme && darkTheme !== null
+                            ? defaultDarkTheme
+                            : darkTheme,
                     defaultTheme,
                 }}
             >
@@ -56,13 +62,16 @@ export interface AdminContextProps extends CoreAdminContextProps {
 
     /**
      * The material-UI theme to customize the UI. Prefer the theme prop.
+     * If not provided, the default light theme is used.
      *
      * @see https://marmelab.com/react-admin/Admin.html#theme
      */
     lightTheme?: RaThemeOptions;
 
     /**
      * The material-UI theme to apply to the UI when the dark mode is activated.
+     * If not provided, the default dark theme is used.
+     * If set to null, the dark mode is disabled.
      *
      * @see https://marmelab.com/react-admin/Admin.html#darktheme
      * @example
@@ -80,7 +89,7 @@ export interface AdminContextProps extends CoreAdminContextProps {
      *     </Admin>
      * );
      */
-    darkTheme?: RaThemeOptions;
+    darkTheme?: RaThemeOptions | null;
 
     /**
      * The default theme to use when the user hasn't chosen a theme yet.

packages/ra-ui-materialui/src/button/ToggleThemeButton.stories.tsx

@@ -97,12 +97,7 @@ const BookList = () => (
 );
 
 export const Basic = () => (
-    <Admin
-        store={memoryStore()}
-        dataProvider={dataProvider}
-        history={history}
-        darkTheme={{ palette: { mode: 'dark' } }}
-    >
+    <Admin store={memoryStore()} dataProvider={dataProvider} history={history}>
         <Resource name="books" list={BookList} />
     </Admin>
 );

packages/ra-ui-materialui/src/layout/Menu.stories.tsx

@@ -1,10 +1,9 @@
 import * as React from 'react';
 import { Resource, CustomRoutes, testDataProvider, memoryStore } from 'ra-core';
-import { defaultTheme, Admin, useSidebarState } from 'react-admin';
+import { Admin, useSidebarState } from 'react-admin';
 import {
     Typography,
     Skeleton,
-    ThemeOptions,
     MenuItem,
     ListItemText,
     ListItemIcon,
@@ -30,8 +29,6 @@ export default { title: 'ra-ui-materialui/layout/Menu' };
 
 const resources = ['Posts', 'Comments', 'Tags', 'Users', 'Orders', 'Reviews'];
 
-const darkTheme: ThemeOptions = { ...defaultTheme, palette: { mode: 'dark' } };
-
 const DemoList = ({ name }) => (
     <>
         <Title title={name} />
@@ -48,7 +45,6 @@ export const Default = () => {
             store={memoryStore()}
             dataProvider={testDataProvider()}
             layout={DefaultLayout}
-            darkTheme={darkTheme}
         >
             {resources.map((resource, index) => (
                 <Resource
@@ -70,7 +66,6 @@ export const Dense = () => {
             store={memoryStore()}
             dataProvider={testDataProvider()}
             layout={LayoutDense}
-            darkTheme={darkTheme}
         >
             {resources.map((resource, index) => (
                 <Resource