[Doc] Added CSS API for the Toolbar component

docs/CreateEdit.md

@@ -1625,13 +1625,29 @@ export const PostEdit = (props) => (
 
 Here are the props received by the `Toolbar` component when passed as the `toolbar` prop of the `SimpleForm` or `TabbedForm` components:
 
+* `alwaysEnableSaveButton`: Force enabling the `<SaveButton>`. If it's not defined, the `<SaveButton>` will be enabled using the `pristine` prop (disabled if pristine, enabled otherwise).
 * `handleSubmitWithRedirect`: The function to call in order to submit the form. It accepts a single parameter overriding the form's default redirect.
 * `handleSubmit` which is the same prop as in [react-final-form](https://final-form.org/docs/react-final-form/types/FormRenderProps#handlesubmit)
 * `invalid`: A boolean indicating whether the form is invalid
 * `pristine`: A boolean indicating whether the form is pristine (eg: no inputs have been changed yet)
 * `redirect`: The default form's redirect
 * `saving`: A boolean indicating whether a save operation is ongoing.
 * `submitOnEnter`: A boolean indicating whether the form should be submitted when pressing `enter`
+* `width`: A string apply to the mobile or desktop classes depending on its value. Pass `xs` to display the mobile version.
+
+### CSS API
+
+The `<Toolbar>` accepts the usual `className` prop but you can override many class names injected to the inner components by React-admin thanks to the `classes` property (as most Material UI components, see their [documentation about it](https://material-ui.com/customization/components/#overriding-styles-with-classes)). This property accepts the following keys:
+
+| Rule name        | Description                                                                     |
+| ---------------- | ------------------------------------------------------------------------------- |
+| `toolbar`        | Applied to the underlying `MuiToolbar` component                                |
+| `defaultToolbar` | Applied to the container of the `<Toolbar>` buttons when no children are passed |
+| `desktopToolbar` | Applied to the underlying `MuiToolbar` component when `width` prop is not `xs`  |
+| `mobileToolbar`  | Applied to the underlying `MuiToolbar` component when `width` prop is `xs`      |
+| `spacer`         | Applied to the div below the underlying `MuiToolbar` used as spacer             |
+
+To override the style of all instances of `<Toolbar>` components using the [material-ui style overrides](https://material-ui.com/customization/globals/#css), use the `RaToolbar` key.
 
 **Tip**: Use react-admin's `<Toolbar>` component instead of material-ui's `<Toolbar>` component. The former builds upon the latter and adds support for an alternative mobile layout (and is therefore responsive).
 

packages/ra-ui-materialui/src/form/Toolbar.tsx

@@ -91,7 +91,7 @@ const valueOrDefault = (value, defaultValue) =>
  * @typedef {Object} Props the props you can use (other props are injected by the <SimpleForm>)
  * @prop {boolean} alwaysEnableSaveButton Force enabling the <SaveButton>. If it's not defined, the <SaveButton> will be enabled using the `pristine` prop (disabled if pristine, enabled otherwise).
  * @prop {ReactElement[]} children Customize the buttons you want to display in the <Toolbar>.
- * @prop {string} width Apply the mobile or the desktop classes depending on the width. Pass "xs" to display the mobile version.
+ * @prop {string} width Apply to the mobile or desktop classes depending on its value. Pass `xs` to display the mobile version.
  *
  */
 const Toolbar: FC<ToolbarProps> = props => {