Fix misplaced Popover when using Floating UI (#566)

src/components/Popover/Popover.jsx

@@ -4,6 +4,7 @@ import { createPortal } from 'react-dom';
 import { withGlobalProps } from '../../providers/globalProps';
 import { classNames } from '../../utils/classNames';
 import { transferProps } from '../../utils/transferProps';
+import cleanPlacementStyle from './_helpers/cleanPlacementStyle';
 import getRootSideClassName from './_helpers/getRootSideClassName';
 import getRootAlignmentClassName from './_helpers/getRootAlignmentClassName';
 import styles from './Popover.module.scss';
@@ -12,6 +13,7 @@ export const Popover = React.forwardRef((props, ref) => {
   const {
     placement,
     children,
+    placementStyle,
     popoverTargetId,
     portalId,
     ...restProps
@@ -41,6 +43,7 @@ export const Popover = React.forwardRef((props, ref) => {
           getRootAlignmentClassName(placement, styles),
         )}
         ref={ref}
+        style={cleanPlacementStyle(placementStyle ?? {})}
       >
         {children}
         <span className={styles.arrow} />
@@ -57,6 +60,7 @@ export const Popover = React.forwardRef((props, ref) => {
 
 Popover.defaultProps = {
   placement: 'bottom',
+  placementStyle: null,
   popoverTargetId: null,
   portalId: null,
 };
@@ -84,6 +88,24 @@ Popover.propTypes = {
     'left-start',
     'left-end',
   ]),
+  /**
+   * Used for positioning the popover with a library like Floating UI. It is filtered,
+   * then passed to the popover as the `style` prop.
+   */
+  placementStyle: PropTypes.shape({
+    bottom: PropTypes.string,
+    inset: PropTypes.string,
+    'inset-block-end': PropTypes.string,
+    'inset-block-start': PropTypes.string,
+    'inset-inline-end': PropTypes.string,
+    'inset-inline-start': PropTypes.string,
+    left: PropTypes.string,
+    position: PropTypes.string,
+    right: PropTypes.string,
+    top: PropTypes.string,
+    'transform-origin': PropTypes.string,
+    translate: PropTypes.string,
+  }),
   /**
    * If set, the popover will become controlled, meaning it will be hidden by default and will need a trigger to open.
    * This sets the ID of the internal helper element for the popover.

src/components/Popover/README.md

@@ -162,6 +162,29 @@ automatically, including smart position updates to ensure Popover visibility,
 we recommend to involve an external library designed specifically for this
 purpose.
 
+To position the popover, you need to provide the `placementStyle` prop with the
+style you want to apply to the popover. This prop should only be used to
+position the popover. The allowed props are:
+
+- `position`
+- `inset`
+- `inset-inline-start`
+- `inset-inline-end`
+- `inset-block-start`
+- `inset-block-end`
+- `top`
+- `right`
+- `bottom`
+- `left`
+- `translate`
+- `transform-origin`
+
+⚠️ [`inset`][mdn-inset] is a shorthand for `top right bottom left`, not for
+`inset-*` properties.
+
+As opposed to `top right bottom left` and the `inset` shorthand, `inset-*`
+properties are writing-direction aware.
+
 ℹ️ The following example is using external library [Floating UI]. To use
 Floating UI, install it first:
 
@@ -267,10 +290,10 @@ React.createElement(() => {
             <Popover
               id="my-advanced-popover"
               placement={finalPlacement}
-              style={{
+              placementStyle={{
                 position: strategy,
-                top: y ? y : '',
-                left: x ? x : '',
+                top: `${y}px`,
+                left: `${x}px`,
               }}
               ref={floating}
             >
@@ -359,5 +382,6 @@ which enables [Advanced Positioning](#advanced-positioning).
 
 [div-attributes]: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/div#attributes
 [Floating UI]: https://floating-ui.com/docs/react-dom
+[mdn-inset]: https://developer.mozilla.org/en-US/docs/Web/CSS/inset
 [React common props]: https://react.dev/reference/react-dom/components/common#common-props
 [ref]: https://reactjs.org/docs/refs-and-the-dom.html

src/components/Popover/_helpers/cleanPlacementStyle.js

@@ -0,0 +1,20 @@
+export default (placementStyle) => {
+  const validProps = [
+    'position',
+    'inset',
+    'inset-inline-start',
+    'inset-inline-end',
+    'inset-block-start',
+    'inset-block-end',
+    'top',
+    'right',
+    'bottom',
+    'left',
+    'translate',
+    'transform-origin',
+  ];
+
+  return Object.fromEntries(
+    Object.entries(placementStyle).filter(([prop]) => validProps.includes(prop)),
+  );
+};