[Accordion] Add support for CSS variables

docs/pages/experiments/material-ui/accordion.tsx

@@ -0,0 +1,108 @@
+import * as React from 'react';
+import {
+  Experimental_CssVarsProvider as CssVarsProvider,
+  useColorScheme,
+} from '@mui/material/styles';
+import CssBaseline from '@mui/material/CssBaseline';
+import Box from '@mui/material/Box';
+import Button from '@mui/material/Button';
+import Container from '@mui/material/Container';
+import Moon from '@mui/icons-material/DarkMode';
+import Sun from '@mui/icons-material/LightMode';
+import Accordion from '@mui/material/Accordion';
+import AccordionSummary from '@mui/material/AccordionSummary';
+import AccordionDetails from '@mui/material/AccordionDetails';
+import Typography from '@mui/material/Typography';
+import ExpandMoreIcon from '@mui/icons-material/ExpandMore';
+
+const ColorSchemePicker = () => {
+  const { mode, setMode } = useColorScheme();
+  const [mounted, setMounted] = React.useState(false);
+  React.useEffect(() => {
+    setMounted(true);
+  }, []);
+  if (!mounted) {
+    return null;
+  }
+
+  return (
+    <Button
+      variant="outlined"
+      onClick={() => {
+        if (mode === 'light') {
+          setMode('dark');
+        } else {
+          setMode('light');
+        }
+      }}
+    >
+      {mode === 'light' ? <Moon /> : <Sun />}
+    </Button>
+  );
+};
+
+export default function CssVarsTemplate() {
+  return (
+    <CssVarsProvider>
+      <CssBaseline />
+      <Container sx={{ my: 5 }}>
+        <Box sx={{ pb: 2 }}>
+          <ColorSchemePicker />
+        </Box>
+        <Box
+          sx={{
+            display: 'grid',
+            gridTemplateColumns: 'repeat(auto-fill, minmax(256px, 1fr))',
+            gridAutoRows: 'minmax(160px, auto)',
+            gap: 2,
+            '& > div': {
+              placeSelf: 'center',
+            },
+          }}
+        >
+          <Box>
+            <Accordion>
+              <AccordionSummary
+                expandIcon={<ExpandMoreIcon />}
+                aria-controls="panel1a-content"
+                id="panel1a-header"
+              >
+                <Typography>Accordion 1</Typography>
+              </AccordionSummary>
+              <AccordionDetails>
+                <Typography>
+                  Lorem ipsum dolor sit amet, consectetur adipiscing elit. Suspendisse malesuada
+                  lacus ex, sit amet blandit leo lobortis eget.
+                </Typography>
+              </AccordionDetails>
+            </Accordion>
+            <Accordion>
+              <AccordionSummary
+                expandIcon={<ExpandMoreIcon />}
+                aria-controls="panel2a-content"
+                id="panel2a-header"
+              >
+                <Typography>Accordion 2</Typography>
+              </AccordionSummary>
+              <AccordionDetails>
+                <Typography>
+                  Lorem ipsum dolor sit amet, consectetur adipiscing elit. Suspendisse malesuada
+                  lacus ex, sit amet blandit leo lobortis eget.
+                </Typography>
+              </AccordionDetails>
+            </Accordion>
+            <Accordion disabled>
+              <AccordionSummary
+                expandIcon={<ExpandMoreIcon />}
+                aria-controls="panel3a-content"
+                id="panel3a-header"
+              >
+                <Typography>Disabled Accordion</Typography>
+              </AccordionSummary>
+            </Accordion>
+          </Box>
+        </Box>
+      </Container>
+    </CssVarsProvider>
+  );
+}

packages/mui-material/src/Accordion/Accordion.js

@@ -60,7 +60,7 @@ const AccordionRoot = styled(Paper, {
         height: 1,
         content: '""',
         opacity: 1,
-        backgroundColor: theme.palette.divider,
+        backgroundColor: (theme.vars || theme).palette.divider,
         transition: theme.transitions.create(['opacity', 'background-color'], transition),
       },
       '&:first-of-type': {
@@ -85,20 +85,20 @@ const AccordionRoot = styled(Paper, {
         },
       },
       [`&.${accordionClasses.disabled}`]: {
-        backgroundColor: theme.palette.action.disabledBackground,
+        backgroundColor: (theme.vars || theme).palette.action.disabledBackground,
       },
     };
   },
   ({ theme, ownerState }) => ({
     ...(!ownerState.square && {
       borderRadius: 0,
       '&:first-of-type': {
-        borderTopLeftRadius: theme.shape.borderRadius,
-        borderTopRightRadius: theme.shape.borderRadius,
+        borderTopLeftRadius: (theme.vars || theme).shape.borderRadius,
+        borderTopRightRadius: (theme.vars || theme).shape.borderRadius,
       },
       '&:last-of-type': {
-        borderBottomLeftRadius: theme.shape.borderRadius,
-        borderBottomRightRadius: theme.shape.borderRadius,
+        borderBottomLeftRadius: (theme.vars || theme).shape.borderRadius,
+        borderBottomRightRadius: (theme.vars || theme).shape.borderRadius,
         // Fix a rendering issue on Edge
         '@supports (-ms-ime-align: auto)': {
           borderBottomLeftRadius: 0,

packages/mui-material/src/AccordionSummary/AccordionSummary.js

@@ -38,10 +38,10 @@ const AccordionSummaryRoot = styled(ButtonBase, {
     padding: theme.spacing(0, 2),
     transition: theme.transitions.create(['min-height', 'background-color'], transition),
     [`&.${accordionSummaryClasses.focusVisible}`]: {
-      backgroundColor: theme.palette.action.focus,
+      backgroundColor: (theme.vars || theme).palette.action.focus,
     },
     [`&.${accordionSummaryClasses.disabled}`]: {
-      opacity: theme.palette.action.disabledOpacity,
+      opacity: (theme.vars || theme).palette.action.disabledOpacity,
     },
     [`&:hover:not(.${accordionSummaryClasses.disabled})`]: {
       cursor: 'pointer',
@@ -78,7 +78,7 @@ const AccordionSummaryExpandIconWrapper = styled('div', {
   overridesResolver: (props, styles) => styles.expandIconWrapper,
 })(({ theme }) => ({
   display: 'flex',
-  color: theme.palette.action.active,
+  color: (theme.vars || theme).palette.action.active,
   transform: 'rotate(0deg)',
   transition: theme.transitions.create('transform', {
     duration: theme.transitions.duration.shortest,