From 63c725bec4bf44406a1622caffdf759be184bbbc Mon Sep 17 00:00:00 2001
From: Super Snager <supersnager@gmail.com>
Date: Sat, 4 Feb 2023 20:20:16 +0100
Subject: [PATCH] feat(expansion-panel): added controlled opening state

---
 .../ExpansionPanel/ExpansionPanel.d.ts        |  8 +++-
 .../ExpansionPanel/ExpansionPanel.jsx         | 37 ++++++++++++++++---
 2 files changed, 38 insertions(+), 7 deletions(-)

diff --git a/src/components/ExpansionPanel/ExpansionPanel.d.ts b/src/components/ExpansionPanel/ExpansionPanel.d.ts
index 37aaf5d..c921599 100644
--- a/src/components/ExpansionPanel/ExpansionPanel.d.ts
+++ b/src/components/ExpansionPanel/ExpansionPanel.d.ts
@@ -1,9 +1,13 @@
-import type {ReactElement} from "react";
+import type {ReactElement, MouseEvent} from "react";
 import type {ChatComponentPropsChildren} from "../../types";
 
-export interface ExpansionPanelProps {
+export type ExpansionPanelOnChangeHandler<IsOpened extends boolean | undefined> = IsOpened extends boolean ? (evt: MouseEvent) => void : (state: boolean, evt: MouseEvent ) => void;
+
+export interface ExpansionPanelProps<IsOpened extends boolean | undefined = undefined> {
     title?:string;
     open?:boolean;
+    isOpened?: IsOpened;
+    onChange?: ExpansionPanelOnChangeHandler<IsOpened>;   
 }
 
 export declare const ExpansionPanel: (props:ChatComponentPropsChildren<ExpansionPanelProps,"div">) => ReactElement;
diff --git a/src/components/ExpansionPanel/ExpansionPanel.jsx b/src/components/ExpansionPanel/ExpansionPanel.jsx
index 2914510..b56f124 100644
--- a/src/components/ExpansionPanel/ExpansionPanel.jsx
+++ b/src/components/ExpansionPanel/ExpansionPanel.jsx
@@ -1,4 +1,4 @@
-import React, { useState } from "react";
+import React, { useState, useCallback, useMemo } from "react";
 import PropTypes from "prop-types";
 import { prefix } from "../settings";
 import classNames from "classnames";
@@ -10,6 +10,8 @@ export const ExpansionPanel = ({
   children,
   title,
   open: defaultOpen,
+  isOpened,
+  onChange,
   className,
   ...rest
 }) => {
@@ -19,12 +21,29 @@ export const ExpansionPanel = ({
 
   const [open, setOpen] = useState(defaultOpenFlag);
 
-  const openModifier = open === true ? `${cName}--open` : "";
-  const icon = open === true ? faChevronDown : faChevronLeft;
+  const opened = useMemo(
+    () => (typeof isOpened === "boolean" ? isOpened : open),
+    [isOpened, open]
+  );
+
+  const openModifier = opened === true ? `${cName}--open` : "";
+  const icon = opened === true ? faChevronDown : faChevronLeft;
+
+  const handleOpen = useCallback(
+    (e) => {
+      if (typeof isOpened === "boolean") {
+        onChange?.(e);
+      } else {
+        setOpen(!opened);
+        onChange?.(!opened, e);
+      }
+    },
+    [onChange, open, opened, isOpened]
+  );
 
   return (
     <div {...rest} className={classNames(cName, openModifier, className)}>
-      <div className={`${cName}__header`} onClick={() => setOpen(!open)}>
+      <div className={`${cName}__header`} onClick={handleOpen}>
         <div className={`${cName}__title`}>{title}</div>
         <div className={`${cName}__icon`}>
           <FontAwesomeIcon icon={icon} />
@@ -35,6 +54,8 @@ export const ExpansionPanel = ({
   );
 };
 
+ExpansionPanel.displayName = "ExpansionPanel";
+
 ExpansionPanel.propTypes = {
   /** Primary content. */
   children: PropTypes.node,
@@ -42,11 +63,17 @@ ExpansionPanel.propTypes = {
   /** Title. */
   title: PropTypes.string,
 
-  /** Default open state. */
+  /** Default open state (uncontrolled mode). */
   open: PropTypes.bool,
 
+  /** If panel is opened (controlled mode). */
+  isOpened: PropTypes.bool,
+
   /** Additional classes. */
   className: PropTypes.string,
+
+  /** Called when the opening state changes. */
+  onChange: PropTypes.func,
 };
 
 ExpansionPanel.defaultProps = {