mirror of
https://github.com/storybookjs/storybook.git
synced 2025-04-05 16:11:33 +08:00
130 lines
4.8 KiB
Markdown
130 lines
4.8 KiB
Markdown
---
|
||
title: 'Toolbars & globals'
|
||
---
|
||
|
||
Storybook ships with toolbar items to control the [viewport](./viewport.md) and [background](./backgrounds.md) the story renders in. You can also create your own toolbar items which control special “globals” which you can then read to create [decorators](../writing-stories/decorators.md) to control story rendering.
|
||
|
||
## Globals
|
||
|
||
Globals in Storybook represent “global” (as in not story-specific) inputs to the rendering of the story. As they aren’t specific to the story, they aren’t passed in the `args` argument to the story function (although they are accessible as `context.globals`), but typically you use them in decorators which apply to all stories.
|
||
|
||
When the globals change, the story re-renders and the decorators rerun with the new values. The easiest way to change globals is to create a toolbar item for them.
|
||
|
||
## Global types and the toolbar annotation
|
||
|
||
Storybook has a simple, declarative syntax for configuring toolbar menus. In your [`.storybook/preview.js`](../configure/overview.md#configure-story-rendering), you can add your own toolbars by creating `globalTypes` with a `toolbar` annotation:
|
||
|
||
<!-- prettier-ignore-start -->
|
||
|
||
<CodeSnippets
|
||
paths={[
|
||
'common/storybook-preview-configure-globaltypes.js.mdx',
|
||
]}
|
||
/>
|
||
|
||
<!-- prettier-ignore-end -->
|
||
|
||
<div class="aside">
|
||
|
||
As globals are _global_ you can _only_ set `globalTypes` in [`.storybook/preview.js`](../configure/overview.md#configure-story-rendering).
|
||
|
||
</div>
|
||
|
||
When you start your Storybook, you should see a new dropdown in your toolbar with options `light` and `dark`.
|
||
|
||
## Create a decorator
|
||
|
||
We have a `global` defined, let's wire it up! We can consume our new `theme` global in a decorator using the `context.globals.theme` value.
|
||
|
||
For example, suppose you are using `styled-components`. You can add a theme provider decorator to your [`.storybook/preview.js`](../configure/overview.md#configure-story-rendering) config:
|
||
|
||
<!-- prettier-ignore-start -->
|
||
|
||
<CodeSnippets
|
||
paths={[
|
||
'common/storybook-preview-use-global-type.js.mdx',
|
||
]}
|
||
/>
|
||
|
||
<!-- prettier-ignore-end -->
|
||
|
||
## Advanced usage
|
||
|
||
So far we've managed to create and consume a global inside Storybook.
|
||
|
||
Now let's take a look at a more complex example. Let's suppose we wanted to implement a new global called **locale** for internationalization, which shows a flag on the right side of the toolbar.
|
||
|
||
In your [`.storybook/preview.js`](../configure/overview.md#configure-story-rendering), add the following:
|
||
|
||
<!-- prettier-ignore-start -->
|
||
|
||
<CodeSnippets
|
||
paths={[
|
||
'common/storybook-preview-locales-globaltype.js.mdx',
|
||
]}
|
||
/>
|
||
|
||
<!-- prettier-ignore-end -->
|
||
|
||
By adding the the configuration element `right`, the text will displayed on the right side in the toolbar menu, once you connect it to a decorator.
|
||
|
||
Here's a list of the configuration options available.
|
||
|
||
| MenuItem | Type | Description | Required |
|
||
| --------- | :----: | :-------------------------------------------------------------: | :------: |
|
||
| **value** | String | The string value of the menu that gets set in the globals | Yes |
|
||
| **title** | String | The main text of the title | Yes |
|
||
| **left** | String | A string that gets shown in left side of the menu | No |
|
||
| **right** | String | A string that gets shown in right side of the menu | No |
|
||
| **icon** | String | An icon that gets shown in the toolbar if this item is selected | No |
|
||
|
||
## Consuming globals from within a story
|
||
|
||
We recommend consuming globals from within a decorator and define a global setting for all stories.
|
||
|
||
But we're aware that sometimes it's more useful to use toolbar options in a per-story basis.
|
||
|
||
Using the example above, you can modify any story to retrieve the **Locale** `global` from the story context:
|
||
|
||
<!-- prettier-ignore-start -->
|
||
|
||
<CodeSnippets
|
||
paths={[
|
||
'common/my-component-story-use-globaltype.js.mdx',
|
||
]}
|
||
/>
|
||
|
||
<!-- prettier-ignore-end -->
|
||
|
||
<div class="aside">
|
||
|
||
In Storybook 6.0, if you set the global option `passArgsFirst: false` for backwards compatibility, the story context is passed as the first argument:
|
||
|
||
<!-- prettier-ignore-start -->
|
||
|
||
<CodeSnippets
|
||
paths={[
|
||
'common/my-component-story-use-globaltype-backwards-compat.js.mdx',
|
||
]}
|
||
/>
|
||
|
||
<!-- prettier-ignore-end -->
|
||
|
||
</div>
|
||
|
||
## Consuming globals from within an addon
|
||
|
||
If you're working on a Storybook addon and you need to retrieve globals. You can do so, The `@storybook/api` package provides a hook for this scenario, you can use the `useGlobals()` hook to retrieve any globals you want.
|
||
|
||
Using the ThemeProvider example above, you could expand it to display which current theme is being shown inside a panel like so:
|
||
|
||
<!-- prettier-ignore-start -->
|
||
|
||
<CodeSnippets
|
||
paths={[
|
||
'common/addon-consume-globaltype.js.mdx',
|
||
]}
|
||
/>
|
||
|
||
<!-- prettier-ignore-end -->
|