[Accordion] New Accordion components and hooks

docs/pages/experiments/accordion.tsx

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+import * as React from 'react';
+import * as Accordion from '@base_ui/react/Accordion';
+
+export default function App() {
+  return (
+    <div className="App AccordionDemo">
+      <pre>Plain HTML</pre>
+      <div role="region" className="MyAccordion-root" aria-label="My Accordion Component">
+        <div className="MyAccordion-section">
+          <h3 className="MyAccordion-heading">
+            <button
+              type="button"
+              aria-controls="Panel1"
+              aria-expanded="true"
+              className="MyAccordion-trigger"
+              id="Trigger1"
+            >
+              Panel 1
+            </button>
+          </h3>
+          <div id="Panel1" className="MyAccordion-panel" role="region" aria-labelledby="Trigger1">
+            This the contents of Panel 1
+          </div>
+        </div>
+
+        <div className="MyAccordion-section">
+          <h3 className="MyAccordion-heading">
+            <button
+              type="button"
+              aria-controls="Panel2"
+              aria-expanded="false"
+              className="MyAccordion-trigger"
+              id="Trigger2"
+            >
+              Panel 2
+            </button>
+          </h3>
+          <div id="Panel2" className="MyAccordion-panel" role="region" aria-labelledby="Trigger2">
+            This the contents of Panel 2
+          </div>
+        </div>
+      </div>
+
+      <br />
+      <br />
+      <hr />
+      <br />
+      <br />
+
+      <pre>Base UI</pre>
+
+      <Accordion.Root className="MyAccordion-root">
+        <Accordion.Section className="MyAccordion-section">
+          <Accordion.Heading className="MyAccordion-heading">
+            <Accordion.Trigger className="MyAccordion-trigger">Trigger 1</Accordion.Trigger>
+          </Accordion.Heading>
+          <Accordion.Panel className="MyAccordion-panel">
+            This is the contents of Accordion.Panel 1
+          </Accordion.Panel>
+        </Accordion.Section>
+
+        <Accordion.Section className="MyAccordion-section">
+          <Accordion.Heading className="MyAccordion-heading">
+            <Accordion.Trigger className="MyAccordion-trigger">Trigger 2</Accordion.Trigger>
+          </Accordion.Heading>
+          <Accordion.Panel className="MyAccordion-panel">
+            This is the contents of Accordion.Panel 2
+          </Accordion.Panel>
+        </Accordion.Section>
+      </Accordion.Root>
+    </div>
+  );
+}

packages/mui-base/src/Accordion/Heading/AccordionHeading.test.tsx

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+import * as React from 'react';
+// import { expect } from 'chai';
+// import { spy } from 'sinon';
+import { createRenderer /* , act */ } from '@mui/internal-test-utils';
+import * as Accordion from '@base_ui/react/Accordion';
+import * as Collapsible from '@base_ui/react/Collapsible';
+import { describeConformance } from '../../../test/describeConformance';
+
+const { AccordionRootContext, AccordionSectionContext } = Accordion;
+
+const { CollapsibleContext } = Collapsible;
+
+const accordionRootContextValue: Accordion.Root.Context = {
+  accordionSectionRefs: { current: [] },
+  animated: false,
+  disabled: false,
+  handleOpenChange() {},
+  ownerState: {
+    value: [0],
+    disabled: false,
+  },
+  value: [0],
+};
+
+const accordionSectionContextValue: Accordion.Section.Context = {
+  open: true,
+  ownerState: {
+    value: [0],
+    disabled: false,
+    index: 0,
+    open: true,
+    transitionStatus: undefined,
+  },
+};
+
+const collapsibleContextValue: Collapsible.Root.Context = {
+  animated: false,
+  contentId: ':content:',
+  disabled: false,
+  mounted: true,
+  open: true,
+  setContentId() {},
+  setMounted() {},
+  setOpen() {},
+  transitionStatus: undefined,
+  ownerState: {
+    open: true,
+    disabled: false,
+    transitionStatus: undefined,
+  },
+};
+
+describe('<Accordion.Heading />', () => {
+  const { render } = createRenderer();
+
+  describeConformance(<Accordion.Heading />, () => ({
+    inheritComponent: 'h3',
+    render: (node) => {
+      const { container, ...other } = render(
+        <AccordionRootContext.Provider value={accordionRootContextValue}>
+          <CollapsibleContext.Provider value={collapsibleContextValue}>
+            <AccordionSectionContext.Provider value={accordionSectionContextValue}>
+              {node}
+            </AccordionSectionContext.Provider>
+          </CollapsibleContext.Provider>
+        </AccordionRootContext.Provider>,
+      );
+
+      return { container, ...other };
+    },
+    refInstanceof: window.HTMLHeadingElement,
+  }));
+});

packages/mui-base/src/Accordion/Heading/AccordionHeading.tsx

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+'use client';
+import * as React from 'react';
+import { BaseUIComponentProps } from '../../utils/types';
+import { useComponentRenderer } from '../../utils/useComponentRenderer';
+import type { AccordionSection } from '../Section/AccordionSection';
+import { useAccordionSectionContext } from '../Section/AccordionSectionContext';
+import { accordionStyleHookMapping } from '../Section/styleHooks';
+
+const AccordionHeading = React.forwardRef(function AccordionHeading(
+  props: AccordionHeading.Props,
+  forwardedRef: React.ForwardedRef<HTMLHeadingElement>,
+) {
+  const { render, className, ...otherProps } = props;
+
+  const { ownerState } = useAccordionSectionContext();
+
+  const { renderElement } = useComponentRenderer({
+    render: render ?? 'h3',
+    ownerState,
+    className,
+    ref: forwardedRef,
+    extraProps: otherProps,
+    customStyleHookMapping: accordionStyleHookMapping,
+  });
+
+  return renderElement();
+});
+
+export { AccordionHeading };
+
+export namespace AccordionHeading {
+  export interface Props extends BaseUIComponentProps<'h3', AccordionSection.OwnerState> {}
+}

packages/mui-base/src/Accordion/Panel/AccordionPanel.test.tsx

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+import * as React from 'react';
+// import { expect } from 'chai';
+// import { spy } from 'sinon';
+import { createRenderer /* , act */ } from '@mui/internal-test-utils';
+import * as Accordion from '@base_ui/react/Accordion';
+import * as Collapsible from '@base_ui/react/Collapsible';
+import { describeConformance } from '../../../test/describeConformance';
+
+const { AccordionRootContext, AccordionSectionContext } = Accordion;
+
+const { CollapsibleContext } = Collapsible;
+
+const accordionRootContextValue: Accordion.Root.Context = {
+  accordionSectionRefs: { current: [] },
+  animated: false,
+  disabled: false,
+  handleOpenChange() {},
+  ownerState: {
+    value: [0],
+    disabled: false,
+  },
+  value: [0],
+};
+
+const accordionSectionContextValue: Accordion.Section.Context = {
+  open: true,
+  ownerState: {
+    value: [0],
+    disabled: false,
+    index: 0,
+    open: true,
+    transitionStatus: undefined,
+  },
+};
+
+const collapsibleContextValue: Collapsible.Root.Context = {
+  animated: false,
+  contentId: ':content:',
+  disabled: false,
+  mounted: true,
+  open: true,
+  setContentId() {},
+  setMounted() {},
+  setOpen() {},
+  transitionStatus: undefined,
+  ownerState: {
+    open: true,
+    disabled: false,
+    transitionStatus: undefined,
+  },
+};
+
+describe('<Accordion.Panel />', () => {
+  const { render } = createRenderer();
+
+  describeConformance(<Accordion.Panel />, () => ({
+    inheritComponent: 'div',
+    render: (node) => {
+      const { container, ...other } = render(
+        <AccordionRootContext.Provider value={accordionRootContextValue}>
+          <CollapsibleContext.Provider value={collapsibleContextValue}>
+            <AccordionSectionContext.Provider value={accordionSectionContextValue}>
+              {node}
+            </AccordionSectionContext.Provider>
+          </CollapsibleContext.Provider>
+        </AccordionRootContext.Provider>,
+      );
+
+      return { container, ...other };
+    },
+    refInstanceof: window.HTMLDivElement,
+  }));
+});

packages/mui-base/src/Accordion/Panel/AccordionPanel.tsx

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+'use client';
+import * as React from 'react';
+import { BaseUIComponentProps } from '../../utils/types';
+import { useComponentRenderer } from '../../utils/useComponentRenderer';
+import { useCollapsibleContext } from '../../Collapsible/Root/CollapsibleContext';
+import { useCollapsibleContent } from '../../Collapsible/Content/useCollapsibleContent';
+import type { AccordionSection } from '../Section/AccordionSection';
+import { useAccordionSectionContext } from '../Section/AccordionSectionContext';
+import { accordionStyleHookMapping } from '../Section/styleHooks';
+
+export const AccordionPanel = React.forwardRef(function AccordionPanel(
+  props: AccordionPanel.Props,
+  forwardedRef: React.ForwardedRef<HTMLButtonElement>,
+) {
+  const { className, htmlHidden, render, ...otherProps } = props;
+
+  const { animated, mounted, open, contentId, setContentId, setMounted, setOpen } =
+    useCollapsibleContext();
+
+  const { getRootProps, height } = useCollapsibleContent({
+    animated,
+    htmlHidden,
+    id: contentId,
+    mounted,
+    open,
+    ref: forwardedRef,
+    setContentId,
+    setMounted,
+    setOpen,
+  });
+
+  const { ownerState } = useAccordionSectionContext();
+
+  const { renderElement } = useComponentRenderer({
+    propGetter: getRootProps,
+    render: render ?? 'div',
+    ownerState,
+    className,
+    extraProps: {
+      ...otherProps,
+      style: {
+        '--accordion-content-height': height ? `${height}px` : undefined,
+      },
+    },
+    customStyleHookMapping: accordionStyleHookMapping,
+  });
+
+  return renderElement();
+});
+
+export namespace AccordionPanel {
+  export interface Props
+    extends BaseUIComponentProps<'div', AccordionSection.OwnerState>,
+      Pick<useCollapsibleContent.Parameters, 'htmlHidden'> {}
+}

packages/mui-base/src/Accordion/Root/AccordionRoot.test.tsx

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+import * as React from 'react';
+// import { expect } from 'chai';
+// import { spy } from 'sinon';
+import { createRenderer /* , act */ } from '@mui/internal-test-utils';
+import * as Accordion from '@base_ui/react/Accordion';
+import { describeConformance } from '../../../test/describeConformance';
+
+describe('<Accordion.Root />', () => {
+  const { render } = createRenderer();
+
+  describeConformance(<Accordion.Root />, () => ({
+    inheritComponent: 'div',
+    render,
+    refInstanceof: window.HTMLDivElement,
+  }));
+});