ThemeProvider

Utilities for accessing and providing contextual theme.

Example usage

Use the theme with Fluent UI by wrapping content within the provider. If theme is not provided, default (Fluent) theme will be provided:

import { ThemeProvider } from '@fluentui/react';

export const App = () => (
  <ThemeProvider>
    <>...app</>
  </ThemeProvider>
);

You can also customize your own theme:

import { ThemeProvider, PartialTheme } from '@fluentui/react';

const appTheme: PartialTheme = {
  palette: {
    themePrimary: 'red'
    ...
  }
};

export const App = () => (
  <ThemeProvider theme={appTheme}>
    App content ...
  </ThemeProvider>
);

You can also nest ThemeProviders:

import { ThemeProvider, PartialTheme } from '@fluentui/react';

const appTheme: PartialTheme = {
  palette: {
    themePrimary: 'red'
    ...
  }
};

const headerTheme: PartialTheme = {
  palette: {
    themePrimary: 'orange'
    ...
  }
};

export const App = () => (
  <ThemeProvider theme={appTheme}>
    <ThemeProvider theme={headerTheme}>
      <MyHeader />
    </ThemeProvider>

    App content ...
  </ThemeProvider>
);

You can apply component-level styles:

import { Checkbox, ThemeProvider, createTheme } from '@fluentui/react';

export const App = () => (
  <ThemeProvider
    theme={{
      components: { Checkbox: { styles: { root: { background: 'red' } } } },
    }}
  >
    <Checkbox />
  </ThemeProvider>
);

Accessing theme

useTheme

Theme can be accessed using useTheme hook. If you are specifically accessing theme to create classes/styles, you can use makeStyles described below.

import { useTheme } from '@fluentui/react';

const Content = () => {
  const theme = useTheme();
  ...
};

export const App = () => (
  <ThemeProvider>
    <Content />
  </ThemeProvider>
);

ThemeContext.Consumer

Theme can be accessed in Class Component using ThemeContext.Consumer.

import { Theme, ThemeContext } from '@fluentui/react';

class Content extends React.Component {
  public render() {
    return (
      <ThemeContext.Consumer>
        {(theme: Theme | undefined) => {
          ...
        }}
      </ThemeContext.Consumer>
    );
  }
}

export const App = () => (
  <ThemeProvider>
    <Content />
  </ThemeProvider>
);

Create classes for React components based on theme

Theme can be accessed using the makeStyles hook. This hook abstracts rendering css given the theme object:

import { makeStyles } from '@fluentui/react';

const useFooStyles = makeStyles(theme => ({
  root: {
    background: theme.semanticColors.bodyBackground,
    ':hover': {
      background: theme.semanticColors.bodyBackgroundHovered,
    },
  },
}));

const Foo = props => {
  const classes = useFooStyles();

  return <div className={classes.root} />;
};

How does this change other existing ways of theming Fluent UI components?

Customizer

Customizer is now deprecated and you should replace it with ThemeProvider. CustomizerContext is now deprecated and you should replace it with ThemeContext or useTheme hook.

Deprecations will remain functional as is in Fluent UI v8 but will be removed during the Fluent UI v9 release.

Replace settings prop

Before:

<Customizer settings={{ theme }} />

After:

<ThemeProvider theme={theme} />

Replace scopedSettings prop

Before:

<Customizer
  scopedSettings={{
    Checkbox: {
      styles: CheckboxStyles,
    },
  }}
/>

After:

<ThemeProvider
  theme={{
    components: { Checkbox: { styles: CheckboxStyles } },
  }}
/>

Replace CustomizerContext

Before:

  <CustomizerContext.Consumer>
    {(parentContext: ICustomizerContext) => {
      const theme = parentContext.customizations.settings;
      ...
    }
  </CustomizerContext.Consumer>

After: See options in Accessing theme.

loadTheme

loadTheme remains to work as is. However, you are recommended to replace loadTheme with ThemeProvider. That way, your application consistently has one way of providing theme.

To do that, instead of calling loadTheme(your_theme), you will simply wrap the root component of your React application once with ThemeProvider:

<ThemeProvider theme={your_theme}>
  <App />
</ThemeProvider>

One caveat here is that if you app has styles which relies on @microsoft/load-themed-styles, ThemeProvider won't be able to replace loadTheme in this case.

Fabric component

Instead of using Fabric component, you can now replace it fully with ThemeProvider. Here is how to replace each prop usage:

Other call-outs

• ThemeProvider by default sets background-color for the root element using theme.semanticColors.bodyBackground. If you find the background color being incorrect after switching to ThemeProvider, the right fix is likely that you need to update your theme definition to have the correct bodyBackground. Or, if you don't want any default stylings applied to the root element, you can set applyTo prop to "none".
• ThemeProvider does not set font-family: inherit on all native button, input, textArea elements. If you find any Fluent UI component having incorrect fonts after switching to ThemeProvider, please report an issue.