Create global control shared by all stories

[ayush-shta]

Is your feature request related to a problem? Please describe.

We have a global decorator that wraps all the stories with a "ThemeProvider" wrapper, something like this:

export const decorators = [
  (Story) => (
    <ThemeProvider theme={"light"}>
        <Story />
    </ThemeProvider>
  ),
];

The problem is that I can't find a way to provide control or anything to update the theme from each story.

Describe the solution you'd like
I would want to be able to provide args, argTypes, or anything to the global decorator that allows me to update this theme prop for every story.

Describe alternatives you've considered

1. I've looked into storybook documentation for React that allows us to define args at the global level in preview.js, but this does not seem to work with storybook version of react-native
   https://storybook.js.org/docs/6.5/react/writing-stories/args#global-args

2. Also according to the React storybook documentation, we are able to specify "global types" in our toolbar, but seems like this addon is not supported in storybook react-native
   https://storybook.js.org/docs/6.5/react/essentials/toolbars-and-globals#globals

Are you able to assist bring the feature to reality?
no

Additional context
For context, I'm on storybook 6.5.6

[dannyhw]

@ayush-shta thanks for the feedback, I think it would be good to add this feature, I'll look into it.

[mljlynch]

You should be able to do something like

export const decorators = [
  (Story , { parameters }) => (
    const themeDetails = parameters.themeDetails
    <ThemeProvider theme={themeDetails}>
        <Story />
    </ThemeProvider>
  ),
];

To customize the theme per story.

[YOEL311]

what about the toolbar,
Why can't it be used in react-native?

[dannyhw]

@YOEL311 I'm not sure what toolbar your are referring to.

Also I've actually thought more about this and the solution provided by @mljlynch should actually be a good fit for whats mentioned in this issue.

My response about adding the feature was more about specifically supporting global args. However I believe that will work out of the box in version 7.

[fabioatcorreia]

I think they were referring to the @storybook/addon-toolbars addon, which does not seem to work in Storybook for React Native (as stated on point 2 from the issue description).

Are there any plans to have something similar working?

[jimpala]

FWIW this does now work for me with RN Storybook v7 such that theme will always appear in the controls panel:

import type { Preview } from '@storybook/react';

const preview: Preview = {
  // ...
  argTypes: {
    theme: {
      options: ['light', 'dark'],
      control: { type: 'radio' },
    },
  },
  args: {
    // Set the default value
    theme: 'light',
  },
  decorators: [
    (Story, { args }) => (
      <ThemeProvider theme={args?.theme === 'dark' ? darkTheme : lightTheme}>
        <Story />
      </ThemeProvider>
    ),
  ],
};

export default preview;

Only wrinkle is that this won't preserve theme globally - it will reset to its default whenever you switch between stories.