chore(Accordion): use React.forwardRef()

src/lib/hooks/useAutoControlledValue.js

@@ -0,0 +1,82 @@
+import * as React from 'react'
+
+/**
+ * Helper hook to handle previous comparison of controlled/uncontrolled. Prints an error when "isControlled" value
+ * switches between subsequent renders.
+ */
+function useIsControlled(controlledValue) {
+  const [isControlled] = React.useState(controlledValue !== undefined)
+
+  if (process.env.NODE_ENV !== 'production') {
+    // We don't want these warnings in production even though it is against native behaviour
+    React.useEffect(() => {
+      if (isControlled !== (controlledValue !== undefined)) {
+        const error = new Error()
+
+        const controlWarning = isControlled
+          ? 'a controlled value to be uncontrolled'
+          : 'an uncontrolled value to be controlled'
+        const undefinedWarning = isControlled ? 'defined to an undefined' : 'undefined to a defined'
+
+        // eslint-disable-next-line no-console
+        console.error(
+          [
+            // Default react error
+            `A component is changing ${controlWarning}'. This is likely caused by the value changing from `,
+            `${undefinedWarning} value, which should not happen. Decide between using a controlled or uncontrolled `,
+            'input element for the lifetime of the component.',
+            'More info: https://reactjs.org/link/controlled-components',
+            error.stack,
+          ].join(' '),
+        )
+      }
+    }, [isControlled, controlledValue])
+  }
+
+  return isControlled
+}
+
+/**
+ * A hook that allows optional user control, implements an interface similar to `React.useState()`.
+ * Useful for components which allow uncontrolled and controlled behaviours for users.
+ *
+ * - defaultState - default state or factory initializer
+ * - state - controllable state, undefined state means internal state will be used
+ * - initialState - Used to initialize state if all user provided states are undefined
+ *
+ * @param {{ defaultState?: any, state: any, initialState: any }} options
+ *
+ * @see https://reactjs.org/docs/uncontrolled-components.html
+ * @see https://reactjs.org/docs/hooks-state.html
+ */
+function useAutoControlledValue(options) {
+  const isControlled = useIsControlled(options.state)
+  const initialState =
+    typeof options.defaultState === 'undefined' ? options.initialState : options.defaultState
+
+  const [internalState, setInternalState] = React.useState(initialState)
+  const state = isControlled ? options.state : internalState
+  const stateRef = React.useRef(state)
+
+  React.useEffect(() => {
+    stateRef.current = state
+  }, [state])
+
+  // To match the behavior of the setter returned by React.useState, this callback's identity
+  // should never change. This means it MUST NOT directly reference variables that can change.
+  const setState = React.useCallback((newState) => {
+    // React dispatch can use a factory
+    // https://reactjs.org/docs/hooks-reference.html#functional-updates
+    if (typeof newState === 'function') {
+      stateRef.current = newState(stateRef.current)
+    } else {
+      stateRef.current = newState
+    }
+
+    setInternalState(stateRef.current)
+  }, [])
+
+  return [state, setState]
+}
+
+export default useAutoControlledValue

src/lib/index.js

@@ -46,5 +46,6 @@ export { makeDebugger }
 // Hooks
 //
 
+export useAutoControlledValue from './hooks/useAutoControlledValue'
 export useClassNamesOnNode from './hooks/useClassNamesOnNode'
 export useEventCallback from './hooks/useEventCallback'

src/modules/Accordion/Accordion.js

@@ -11,7 +11,7 @@ import AccordionTitle from './AccordionTitle'
 /**
  * An accordion allows users to toggle the display of sections of content.
  */
-function Accordion(props) {
+const Accordion = React.forwardRef(function (props, ref) {
   const { className, fluid, inverted, styled } = props
 
   const classes = cx(
@@ -23,9 +23,11 @@ function Accordion(props) {
   )
   const rest = getUnhandledProps(Accordion, props)
 
-  return <AccordionAccordion {...rest} className={classes} />
-}
+  // TODO: extract behavior into useAccordion() hook instead of "AccordionAccordion" component
+  return <AccordionAccordion {...rest} className={classes} ref={ref} />
+})
 
+Accordion.displayName = 'Accordion'
 Accordion.propTypes = {
   /** Additional classes. */
   className: PropTypes.string,

src/modules/Accordion/AccordionAccordion.js

@@ -4,97 +4,99 @@ import PropTypes from 'prop-types'
 import React from 'react'
 
 import {
-  ModernAutoControlledComponent as Component,
   childrenUtils,
   createShorthandFactory,
   customPropTypes,
   getElementType,
   getUnhandledProps,
+  useAutoControlledValue,
+  useEventCallback,
 } from '../../lib'
 import AccordionPanel from './AccordionPanel'
 
-const warnIfPropsAreInvalid = (props, state) => {
-  const { exclusive } = props
-  const { activeIndex } = state
-
-  /* eslint-disable no-console */
-  if (exclusive && typeof activeIndex !== 'number') {
-    console.error('`activeIndex` must be a number if `exclusive` is true')
-  } else if (!exclusive && !_.isArray(activeIndex)) {
-    console.error('`activeIndex` must be an array if `exclusive` is false')
-  }
-  /* eslint-enable no-console */
+/**
+ * @param {Boolean} exclusive
+ * @param {Number} activeIndex
+ * @param {Number} itemIndex
+ */
+function isIndexActive(exclusive, activeIndex, itemIndex) {
+  return exclusive ? activeIndex === itemIndex : _.includes(activeIndex, itemIndex)
 }
 
 /**
- * An Accordion can contain sub-accordions.
+ * @param {Boolean} exclusive
+ * @param {Number} activeIndex
+ * @param {Number} itemIndex
  */
-export default class AccordionAccordion extends Component {
-  getInitialAutoControlledState({ exclusive }) {
-    return { activeIndex: exclusive ? -1 : [] }
-  }
-
-  componentDidMount() {
-    if (process.env.NODE_ENV !== 'production') {
-      warnIfPropsAreInvalid(this.props, this.state)
-    }
+function computeNewIndex(exclusive, activeIndex, itemIndex) {
+  if (exclusive) {
+    return itemIndex === activeIndex ? -1 : itemIndex
   }
 
-  componentDidUpdate() {
-    if (process.env.NODE_ENV !== 'production') {
-      warnIfPropsAreInvalid(this.props, this.state)
-    }
+  // check to see if index is in array, and remove it, if not then add it
+  if (_.includes(activeIndex, itemIndex)) {
+    return _.without(activeIndex, itemIndex)
   }
 
-  computeNewIndex = (index) => {
-    const { exclusive } = this.props
-    const { activeIndex } = this.state
-
-    if (exclusive) return index === activeIndex ? -1 : index
-
-    // check to see if index is in array, and remove it, if not then add it
-    return _.includes(activeIndex, index) ? _.without(activeIndex, index) : [...activeIndex, index]
-  }
+  return [...activeIndex, itemIndex]
+}
 
-  handleTitleClick = (e, titleProps) => {
+/**
+ * An Accordion can contain sub-accordions.
+ */
+const AccordionAccordion = React.forwardRef(function (props, ref) {
+  const { className, children, exclusive, panels } = props
+  const [activeIndex, setActiveIndex] = useAutoControlledValue({
+    state: props.activeIndex,
+    defaultState: props.defaultActiveIndex,
+    initialState: () => (exclusive ? -1 : []),
+  })
+
+  const classes = cx('accordion', className)
+  const rest = getUnhandledProps(AccordionAccordion, props)
+  const ElementType = getElementType(AccordionAccordion, props)
+
+  const handleTitleClick = useEventCallback((e, titleProps) => {
     const { index } = titleProps
 
-    this.setState({ activeIndex: this.computeNewIndex(index) })
-    _.invoke(this.props, 'onTitleClick', e, titleProps)
+    setActiveIndex(computeNewIndex(exclusive, activeIndex, index))
+    _.invoke(props, 'onTitleClick', e, titleProps)
+  })
+
+  if (process.env.NODE_ENV !== 'production') {
+    React.useEffect(() => {
+      /* eslint-disable no-console */
+      if (exclusive && typeof activeIndex !== 'number') {
+        console.error('`activeIndex` must be a number if `exclusive` is true')
+      } else if (!exclusive && !_.isArray(activeIndex)) {
+        console.error('`activeIndex` must be an array if `exclusive` is false')
+      }
+      /* eslint-enable no-console */
+    }, [exclusive, activeIndex])
   }
 
-  isIndexActive = (index) => {
-    const { exclusive } = this.props
-    const { activeIndex } = this.state
-
-    return exclusive ? activeIndex === index : _.includes(activeIndex, index)
-  }
+  return (
+    <ElementType {...rest} className={classes} ref={ref}>
+      {childrenUtils.isNil(children)
+        ? _.map(panels, (panel, index) =>
+            AccordionPanel.create(panel, {
+              defaultProps: {
+                active: isIndexActive(exclusive, activeIndex, index),
+                index,
+                onTitleClick: handleTitleClick,
+              },
+            }),
+          )
+        : children}
+    </ElementType>
+  )
+})
 
-  render() {
-    const { className, children, panels } = this.props
-
-    const classes = cx('accordion', className)
-    const rest = getUnhandledProps(AccordionAccordion, this.props)
-    const ElementType = getElementType(AccordionAccordion, this.props)
-
-    return (
-      <ElementType {...rest} className={classes}>
-        {childrenUtils.isNil(children)
-          ? _.map(panels, (panel, index) =>
-              AccordionPanel.create(panel, {
-                defaultProps: {
-                  active: this.isIndexActive(index),
-                  index,
-                  onTitleClick: this.handleTitleClick,
-                },
-              }),
-            )
-          : children}
-      </ElementType>
-    )
-  }
+AccordionAccordion.defaultProps = {
+  exclusive: true,
 }
 
+AccordionAccordion.displayName = 'AccordionAccordion'
 AccordionAccordion.propTypes = {
   /** An element type to render as (string or function). */
   as: PropTypes.elementType,
@@ -140,10 +142,6 @@ AccordionAccordion.propTypes = {
   ]),
 }
 
-AccordionAccordion.defaultProps = {
-  exclusive: true,
-}
-
-AccordionAccordion.autoControlledProps = ['activeIndex']
-
 AccordionAccordion.create = createShorthandFactory(AccordionAccordion, (content) => ({ content }))
+
+export default AccordionAccordion

src/modules/Accordion/AccordionContent.js

@@ -14,19 +14,21 @@ import {
 /**
  * A content sub-component for Accordion component.
  */
-function AccordionContent(props) {
+const AccordionContent = React.forwardRef(function (props, ref) {
   const { active, children, className, content } = props
+
   const classes = cx('content', useKeyOnly(active, 'active'), className)
   const rest = getUnhandledProps(AccordionContent, props)
   const ElementType = getElementType(AccordionContent, props)
 
   return (
-    <ElementType {...rest} className={classes}>
+    <ElementType {...rest} className={classes} ref={ref}>
       {childrenUtils.isNil(children) ? content : children}
     </ElementType>
   )
-}
+})
 
+AccordionContent.displayName = 'AccordionContent'
 AccordionContent.propTypes = {
   /** An element type to render as (string or function). */
   as: PropTypes.elementType,

src/modules/Accordion/AccordionTitle.js

@@ -1,7 +1,7 @@
 import cx from 'clsx'
 import _ from 'lodash'
 import PropTypes from 'prop-types'
-import React, { Component } from 'react'
+import React from 'react'
 
 import {
   childrenUtils,
@@ -10,40 +10,42 @@ import {
   getElementType,
   getUnhandledProps,
   useKeyOnly,
+  useEventCallback,
 } from '../../lib'
 import Icon from '../../elements/Icon'
 
 /**
  * A title sub-component for Accordion component.
  */
-export default class AccordionTitle extends Component {
-  handleClick = (e) => _.invoke(this.props, 'onClick', e, this.props)
+const AccordionTitle = React.forwardRef(function (props, ref) {
+  const { active, children, className, content, icon } = props
 
-  render() {
-    const { active, children, className, content, icon } = this.props
+  const classes = cx(useKeyOnly(active, 'active'), 'title', className)
+  const rest = getUnhandledProps(AccordionTitle, props)
+  const ElementType = getElementType(AccordionTitle, props)
+  const iconValue = _.isNil(icon) ? 'dropdown' : icon
 
-    const classes = cx(useKeyOnly(active, 'active'), 'title', className)
-    const rest = getUnhandledProps(AccordionTitle, this.props)
-    const ElementType = getElementType(AccordionTitle, this.props)
-    const iconValue = _.isNil(icon) ? 'dropdown' : icon
-
-    if (!childrenUtils.isNil(children)) {
-      return (
-        <ElementType {...rest} className={classes} onClick={this.handleClick}>
-          {children}
-        </ElementType>
-      )
-    }
+  const handleClick = useEventCallback((e) => {
+    _.invoke(props, 'onClick', e, props)
+  })
 
+  if (!childrenUtils.isNil(children)) {
     return (
-      <ElementType {...rest} className={classes} onClick={this.handleClick}>
-        {Icon.create(iconValue, { autoGenerateKey: false })}
-        {content}
+      <ElementType {...rest} className={classes} onClick={handleClick} ref={ref}>
+        {children}
       </ElementType>
     )
   }
-}
 
+  return (
+    <ElementType {...rest} className={classes} onClick={handleClick} ref={ref}>
+      {Icon.create(iconValue, { autoGenerateKey: false })}
+      {content}
+    </ElementType>
+  )
+})
+
+AccordionTitle.displayName = 'AccordionTitle'
 AccordionTitle.propTypes = {
   /** An element type to render as (string or function). */
   as: PropTypes.elementType,
@@ -75,3 +77,5 @@ AccordionTitle.propTypes = {
   onClick: PropTypes.func,
 }
 AccordionTitle.create = createShorthandFactory(AccordionTitle, (content) => ({ content }))
+
+export default AccordionTitle