[Popper] Add a modifiers property

docs/src/pages/utils/popper/ScrollPlayground.js

@@ -159,18 +159,17 @@ class AnchorPlayground extends React.Component {
 <Popper
   placement="${placement}"
   disablePortal={${disablePortal}}
-  popperOptions={{
-    modifiers: {
-      flip: {
-        enabled: ${flip},
-      },
-      preventOverflow: {
-        enabled: ${preventOverflow !== 'disabled'},
-        boundariesElement: '${preventOverflow === 'disabled' ? 'scrollParent' : preventOverflow}',
-      },
-      arrow: {
-        enabled: ${arrow},
-      },
+  modifiers={{
+    flip: {
+      enabled: ${flip},
+    },
+    preventOverflow: {
+      enabled: ${preventOverflow !== 'disabled'},
+      boundariesElement: '${preventOverflow === 'disabled' ? 'scrollParent' : preventOverflow}',
+    },
+    arrow: {
+      enabled: ${arrow},
+      element: arrowRef,
     },
   }}
 >
@@ -202,20 +201,18 @@ class AnchorPlayground extends React.Component {
                   placement={placement}
                   disablePortal={disablePortal}
                   className={classes.popper}
-                  popperOptions={{
-                    modifiers: {
-                      flip: {
-                        enabled: flip,
-                      },
-                      arrow: {
-                        enabled: arrow,
-                        element: arrowRef,
-                      },
-                      preventOverflow: {
-                        enabled: preventOverflow !== 'disabled',
-                        boundariesElement:
-                          preventOverflow === 'disabled' ? 'scrollParent' : preventOverflow,
-                      },
+                  modifiers={{
+                    flip: {
+                      enabled: flip,
+                    },
+                    arrow: {
+                      enabled: arrow,
+                      element: arrowRef,
+                    },
+                    preventOverflow: {
+                      enabled: preventOverflow !== 'disabled',
+                      boundariesElement:
+                        preventOverflow === 'disabled' ? 'scrollParent' : preventOverflow,
                     },
                   }}
                 >

packages/material-ui/src/Popper/Popper.d.ts

@@ -7,6 +7,7 @@ export interface PopperProps extends React.HTMLAttributes<HTMLDivElement> {
   container?: PortalProps['container'];
   disablePortal?: PortalProps['disablePortal'];
   keepMounted?: boolean;
+  modifiers?: Object;
   open: boolean;
   placement?:
     | 'bottom-end'

packages/material-ui/src/Popper/Popper.js

@@ -52,6 +52,7 @@ class Popper extends React.Component {
     if (
       prevProps.anchorEl !== this.props.anchorEl ||
       prevProps.popperOptions !== this.props.popperOptions ||
+      prevProps.modifiers !== this.props.modifiers ||
       prevProps.disablePortal !== this.props.disablePortal ||
       prevProps.placement !== this.props.placement
     ) {
@@ -81,7 +82,15 @@ class Popper extends React.Component {
   }
 
   handleRendered = () => {
-    const { anchorEl, open, placement, popperOptions = {}, theme, disablePortal } = this.props;
+    const {
+      anchorEl,
+      modifiers,
+      open,
+      placement,
+      popperOptions = {},
+      theme,
+      disablePortal,
+    } = this.props;
     const popperNode = ReactDOM.findDOMNode(this);
 
     if (this.popper) {
@@ -105,6 +114,7 @@ class Popper extends React.Component {
                 boundariesElement: 'viewport',
               },
             }),
+        ...modifiers,
         ...popperOptions.modifiers,
       },
       // We could have been using a custom modifier like react-popper is doing.
@@ -193,7 +203,7 @@ Popper.propTypes = {
   /**
    * Popper render function or node.
    */
-  children: PropTypes.oneOfType([PropTypes.node, PropTypes.func]),
+  children: PropTypes.oneOfType([PropTypes.node, PropTypes.func]).isRequired,
   /**
    * A node, component instance, or function that returns either.
    * The `container` will passed to the Modal component.
@@ -212,6 +222,16 @@ Popper.propTypes = {
    * when you want to maximize the responsiveness of the Popper.
    */
   keepMounted: PropTypes.bool,
+  /**
+   * Popper.js is based on a "plugin-like" architecture,
+   * most of its features are fully encapsulated "modifiers".
+   *
+   * A modifier is a function that is called each time Popper.js needs to
+   * compute the position of the popper.
+   * For this reason, modifiers should be very performant to avoid bottlenecks.
+   * To learn how to create a modifier, [read the modifiers documentation](https://github.com/FezVrasta/popper.js/blob/master/docs/_includes/popper-documentation.md#modifiers--object).
+   */
+  modifiers: PropTypes.object,
   /**
    * If `true`, the popper is visible.
    */

pages/api/popper.md

@@ -16,10 +16,11 @@ Poppers rely on the 3rd party library [Popper.js](https://github.com/FezVrasta/p
 | Name | Type | Default | Description |
 |:-----|:-----|:--------|:------------|
 | <span class="prop-name">anchorEl</span> | <span class="prop-type">union:&nbsp;object&nbsp;&#124;<br>&nbsp;func<br> |   | This is the DOM element, or a function that returns the DOM element, that may be used to set the position of the popover. |
-| <span class="prop-name">children</span> | <span class="prop-type">union:&nbsp;node&nbsp;&#124;<br>&nbsp;func<br> |   | Popper render function or node. |
+| <span class="prop-name required">children *</span> | <span class="prop-type">union:&nbsp;node&nbsp;&#124;<br>&nbsp;func<br> |   | Popper render function or node. |
 | <span class="prop-name">container</span> | <span class="prop-type">union:&nbsp;object&nbsp;&#124;<br>&nbsp;func<br> |   | A node, component instance, or function that returns either. The `container` will passed to the Modal component. By default, it uses the body of the anchorEl's top-level document object, so it's simply `document.body` most of the time. |
 | <span class="prop-name">disablePortal</span> | <span class="prop-type">bool | <span class="prop-default">false</span> | Disable the portal behavior. The children stay within it's parent DOM hierarchy. |
 | <span class="prop-name">keepMounted</span> | <span class="prop-type">bool |   | Always keep the children in the DOM. This property can be useful in SEO situation or when you want to maximize the responsiveness of the Popper. |
+| <span class="prop-name">modifiers</span> | <span class="prop-type">object |   | Popper.js is based on a "plugin-like" architecture, most of its features are fully encapsulated "modifiers".<br>A modifier is a function that is called each time Popper.js needs to compute the position of the popper. For this reason, modifiers should be very performant to avoid bottlenecks. To learn how to create a modifier, [read the modifiers documentation](https://github.com/FezVrasta/popper.js/blob/master/docs/_includes/popper-documentation.md#modifiers--object). |
 | <span class="prop-name required">open *</span> | <span class="prop-type">bool |   | If `true`, the popper is visible. |
 | <span class="prop-name">placement</span> | <span class="prop-type">enum:&nbsp;'bottom-end', 'bottom-start', 'bottom', 'left-end', 'left-start', 'left', 'right-end', 'right-start', 'right', 'top-end', 'top-start', 'top'<br> | <span class="prop-default">'bottom'</span> | Popper placement. |
 | <span class="prop-name">popperOptions</span> | <span class="prop-type">object |   | Options provided to the [`popper.js`](https://github.com/FezVrasta/popper.js) instance. |