[System] Add flag to switch negative margin approach in Grid

docs/data/system/components/grid/OverflowGrid.js

@@ -0,0 +1,54 @@
+import * as React from 'react';
+import Box from '@mui/system/Box';
+import Grid from '@mui/system/Unstable_Grid';
+import styled from '@mui/system/styled';
+
+const Item = styled('div')(({ theme }) => ({
+  backgroundColor: theme.palette.mode === 'dark' ? '#1A2027' : '#fff',
+  border: '1px solid',
+  borderColor: theme.palette.mode === 'dark' ? '#444d58' : '#ced7e0',
+  padding: theme.spacing(1),
+  borderRadius: '4px',
+  textAlign: 'center',
+}));
+
+export default function AutoGrid() {
+  return (
+    <Box
+      sx={(theme) => ({
+        display: 'flex',
+        flexDirection: 'column',
+        gap: 3,
+        '& > div': {
+          overflow: 'auto hidden',
+          '&::-webkit-scrollbar': { height: 10, WebkitAppearance: 'none' },
+          '&::-webkit-scrollbar-thumb': {
+            borderRadius: 8,
+            border: '2px solid',
+            borderColor: theme.palette.mode === 'dark' ? '' : '#E7EBF0',
+            backgroundColor: 'rgba(0 0 0 / 0.5)',
+          },
+        },
+      })}
+    >
+      <Box
+        sx={{
+          width: 200,
+        }}
+      >
+        <Grid container spacing={3}>
+          <Grid xs={12}>
+            <Item>Scroll bar appears</Item>
+          </Grid>
+        </Grid>
+      </Box>
+      <Box sx={{ width: 200, overflow: 'scroll' }}>
+        <Grid container spacing={3} disableEqualOverflow>
+          <Grid xs={12}>
+            <Item>`disableEqualOverflow` prevents scrollbar</Item>
+          </Grid>
+        </Grid>
+      </Box>
+    </Box>
+  );
+}

docs/data/system/components/grid/OverflowGrid.tsx

@@ -0,0 +1,54 @@
+import * as React from 'react';
+import Box from '@mui/system/Box';
+import Grid from '@mui/system/Unstable_Grid';
+import styled from '@mui/system/styled';
+
+const Item = styled('div')(({ theme }) => ({
+  backgroundColor: theme.palette.mode === 'dark' ? '#1A2027' : '#fff',
+  border: '1px solid',
+  borderColor: theme.palette.mode === 'dark' ? '#444d58' : '#ced7e0',
+  padding: theme.spacing(1),
+  borderRadius: '4px',
+  textAlign: 'center',
+}));
+
+export default function AutoGrid() {
+  return (
+    <Box
+      sx={(theme) => ({
+        display: 'flex',
+        flexDirection: 'column',
+        gap: 3,
+        '& > div': {
+          overflow: 'auto hidden',
+          '&::-webkit-scrollbar': { height: 10, WebkitAppearance: 'none' },
+          '&::-webkit-scrollbar-thumb': {
+            borderRadius: 8,
+            border: '2px solid',
+            borderColor: theme.palette.mode === 'dark' ? '' : '#E7EBF0',
+            backgroundColor: 'rgba(0 0 0 / 0.5)',
+          },
+        },
+      })}
+    >
+      <Box
+        sx={{
+          width: 200,
+        }}
+      >
+        <Grid container spacing={3}>
+          <Grid xs={12}>
+            <Item>Scroll bar appears</Item>
+          </Grid>
+        </Grid>
+      </Box>
+      <Box sx={{ width: 200, overflow: 'scroll' }}>
+        <Grid container spacing={3} disableEqualOverflow>
+          <Grid xs={12}>
+            <Item>`disableEqualOverflow` prevents scrollbar</Item>
+          </Grid>
+        </Grid>
+      </Box>
+    </Box>
+  );
+}

docs/data/system/components/grid/grid.md

@@ -156,6 +156,20 @@ declare module '@mui/system' {
 }
 ```
 
+:::
+
+## Prevent scrollbar
+
+If you use grid as a container in a small viewport, you might see a horizontal scrollbar because the negative margin is applied on all sides of the grid container.
+
+To prevent the scrollbar, set `disableEqualOverflow` prop to `true`. It will enable negative margin only on the top and left sides of the grid which remove overflow on the right-hand side.
+
+{{"demo": "OverflowGrid.js", "bg": true}}
+
+:::warning
+You should avoid adding borders or background to the grid when `disableEqualOverflow: true` because the negative margin (applied only at the top and left sides) makes the grid visually misaligned.
+:::
+
 ## Limitations
 
 ### direction column and column-reverse

docs/pages/system/api/grid.json

@@ -20,6 +20,7 @@
         "description": "'column-reverse'<br>&#124;&nbsp;'column'<br>&#124;&nbsp;'row-reverse'<br>&#124;&nbsp;'row'<br>&#124;&nbsp;Array&lt;'column-reverse'<br>&#124;&nbsp;'column'<br>&#124;&nbsp;'row-reverse'<br>&#124;&nbsp;'row'&gt;<br>&#124;&nbsp;object"
       }
     },
+    "disableEqualOverflow": { "type": { "name": "bool" } },
     "lg": {
       "type": { "name": "union", "description": "'auto'<br>&#124;&nbsp;number<br>&#124;&nbsp;bool" }
     },

docs/translations/api-docs/grid/grid.json

@@ -6,6 +6,7 @@
     "columnSpacing": "Defines the horizontal space between the type <code>item</code> components. It overrides the value of the <code>spacing</code> prop.",
     "container": "If <code>true</code>, the component will have the flex <em>container</em> behavior. You should be wrapping <em>items</em> with a <em>container</em>.",
     "direction": "Defines the <code>flex-direction</code> style property. It is applied for all screen sizes.",
+    "disableEqualOverflow": "If <code>true</code>, the negative margin and padding are apply only to the top and left sides of the grid.",
     "lg": "If a number, it sets the number of columns the grid item uses. It can&#39;t be greater than the total number of columns of the container (12 by default). If &#39;auto&#39;, the grid item&#39;s width matches its content. If false, the prop is ignored. If true, the grid item&#39;s width grows to use the space available in the grid container. The value is applied for the <code>lg</code> breakpoint and wider screens if not overridden.",
     "lgOffset": "If a number, it sets the margin-left equals to the number of columns the grid item uses. If &#39;auto&#39;, the grid item push itself to the right-end of the container. The value is applied for the <code>lg</code> breakpoint and wider screens if not overridden.",
     "md": "If a number, it sets the number of columns the grid item uses. It can&#39;t be greater than the total number of columns of the container (12 by default). If &#39;auto&#39;, the grid item&#39;s width matches its content. If false, the prop is ignored. If true, the grid item&#39;s width grows to use the space available in the grid container. The value is applied for the <code>md</code> breakpoint and wider screens if not overridden.",

packages/mui-system/src/Unstable_Grid/Grid.test.js

@@ -211,6 +211,71 @@ describe('System <Grid />', () => {
     });
   });
 
+  describe('prop: disableEqualOverflow', () => {
+    it('should apply to top and left sides only', function test() {
+      if (/jsdom/.test(window.navigator.userAgent)) {
+        this.skip();
+      }
+      const { container } = render(
+        <Grid container disableEqualOverflow spacing={2}>
+          <Grid />
+        </Grid>,
+      );
+
+      expect(container.firstChild).toHaveComputedStyle({
+        marginTop: '-16px',
+        marginLeft: '-16px',
+      });
+      expect(container.firstChild.firstChild).toHaveComputedStyle({
+        paddingTop: '16px',
+        paddingLeft: '16px',
+      });
+    });
+
+    it('should use the value from theme and nestable', function test() {
+      if (/jsdom/.test(window.navigator.userAgent)) {
+        this.skip();
+      }
+      const { container } = render(
+        <ThemeProvider
+          theme={createTheme({
+            components: {
+              MuiGrid: {
+                defaultProps: {
+                  disableEqualOverflow: true,
+                },
+              },
+            },
+          })}
+        >
+          <Grid container spacing={2}>
+            <Grid container disableEqualOverflow={false} spacing={3}>
+              <Grid />
+            </Grid>
+          </Grid>
+        </ThemeProvider>,
+      );
+      expect(container.firstChild).toHaveComputedStyle({
+        marginTop: '-16px',
+        marginLeft: '-16px',
+      });
+      expect(container.firstChild.firstChild).toHaveComputedStyle({
+        marginTop: '-12px',
+        marginLeft: '-12px',
+        marginRight: '-12px',
+        marginBottom: '-12px',
+        paddingTop: '16px',
+        paddingLeft: '16px',
+      });
+      expect(container.firstChild.firstChild.firstChild).toHaveComputedStyle({
+        paddingTop: '12px',
+        paddingLeft: '12px',
+        paddingRight: '12px',
+        paddingBottom: '12px',
+      });
+    });
+  });
+
   describe('Custom breakpoints', () => {
     it('should apply the custom breakpoint class', () => {
       const { container } = render(

packages/mui-system/src/Unstable_Grid/Grid.tsx

@@ -56,6 +56,10 @@ Grid.propTypes /* remove-proptypes */ = {
     PropTypes.arrayOf(PropTypes.oneOf(['column-reverse', 'column', 'row-reverse', 'row'])),
     PropTypes.object,
   ]),
+  /**
+   * If `true`, the negative margin and padding are apply only to the top and left sides of the grid.
+   */
+  disableEqualOverflow: PropTypes.bool,
   /**
    * If a number, it sets the number of columns the grid item uses.
    * It can't be greater than the total number of columns of the container (12 by default).

packages/mui-system/src/Unstable_Grid/GridProps.ts

@@ -137,6 +137,10 @@ export interface GridBaseProps extends Breakpoints {
    * @default 'row'
    */
   direction?: ResponsiveStyleValue<GridDirection>;
+  /**
+   * If `true`, the negative margin and padding are apply only to the top and left sides of the grid.
+   */
+  disableEqualOverflow?: boolean;
   /**
    * Defines the vertical space between the type `item` components.
    * It overrides the value of the `spacing` prop.

packages/mui-system/src/Unstable_Grid/createGrid.tsx

@@ -58,6 +58,7 @@ export default function createGrid(
   } = options;
 
   const NestedContext = React.createContext(false);
+  const OverflowContext = React.createContext<boolean | undefined>(undefined);
 
   const useUtilityClasses = (ownerState: GridOwnerState, theme: typeof defaultTheme) => {
     const { container, direction, spacing, wrap, gridSize } = ownerState;
@@ -93,6 +94,7 @@ export default function createGrid(
     const themeProps = useThemeProps<typeof inProps & { component?: React.ElementType }>(inProps);
     const props = extendSxProp(themeProps) as Omit<typeof themeProps, 'color'>; // `color` type conflicts with html color attribute.
     const nested = React.useContext(NestedContext);
+    const overflow = React.useContext(OverflowContext);
     const {
       className,
       columns: columnsProp = 12,
@@ -103,9 +105,15 @@ export default function createGrid(
       spacing: spacingProp = 0,
       rowSpacing: rowSpacingProp = spacingProp,
       columnSpacing: columnSpacingProp = spacingProp,
+      disableEqualOverflow: themeDisableEqualOverflow,
       ...rest
     } = props;
-    // collect breakpoints related props because they can be custom from the theme.
+    // Because `disableEqualOverflow` can be set from the theme's defaultProps, the **nested** grid should look at the instance props instead.
+    let disableEqualOverflow = themeDisableEqualOverflow;
+    if (nested && themeDisableEqualOverflow !== undefined) {
+      disableEqualOverflow = inProps.disableEqualOverflow;
+    }
+    // collect breakpoints related props because they can be customized from the theme.
     const gridSize = {} as GridOwnerState['gridSize'];
     const gridOffset = {} as GridOwnerState['gridOffset'];
     const other: Record<string, any> = {};
@@ -138,6 +146,8 @@ export default function createGrid(
       columnSpacing,
       gridSize,
       gridOffset,
+      disableEqualOverflow: disableEqualOverflow ?? overflow ?? false, // use context value if exists.
+      parentDisableEqualOverflow: overflow, // for nested grid
     };
 
     const classes = useUtilityClasses(ownerState, theme);
@@ -156,6 +166,15 @@ export default function createGrid(
       result = <NestedContext.Provider value>{result}</NestedContext.Provider>;
     }
 
+    if (disableEqualOverflow !== undefined && disableEqualOverflow !== (overflow ?? false)) {
+      // There are 2 possibilities that should wrap with the OverflowContext to communicate with the nested grids:
+      // 1. It is the root grid with `disableEqualOverflow`.
+      // 2. It is a nested grid with different `disableEqualOverflow` from the context.
+      result = (
+        <OverflowContext.Provider value={disableEqualOverflow}>{result}</OverflowContext.Provider>
+      );
+    }
+
     return result;
   }) as OverridableComponent<GridTypeMap>;
 
@@ -180,6 +199,7 @@ export default function createGrid(
       PropTypes.arrayOf(PropTypes.oneOf(['column-reverse', 'column', 'row-reverse', 'row'])),
       PropTypes.object,
     ]),
+    disableEqualOverflow: PropTypes.bool,
     lg: PropTypes.oneOfType([PropTypes.oneOf(['auto']), PropTypes.number, PropTypes.bool]),
     lgOffset: PropTypes.oneOfType([PropTypes.oneOf(['auto']), PropTypes.number]),
     md: PropTypes.oneOfType([PropTypes.oneOf(['auto']), PropTypes.number, PropTypes.bool]),

packages/mui-system/src/Unstable_Grid/gridGenerator.test.js

@@ -250,6 +250,49 @@ describe('grid generator', () => {
         padding: `calc(var(--Grid-nested-rowSpacing) / 2) calc(var(--Grid-nested-columnSpacing) / 2)`,
       });
     });
+
+    it('root container with disableEqualOverflow', () => {
+      const result = generateGridStyles({
+        ownerState: { container: true, nested: true, disableEqualOverflow: true },
+      });
+      sinon.assert.match(result, {
+        margin: `calc(var(--Grid-rowSpacing) * -1) 0px 0px calc(var(--Grid-columnSpacing) * -1)`,
+        padding: `calc(var(--Grid-nested-rowSpacing)) 0px 0px calc(var(--Grid-nested-columnSpacing))`,
+      });
+    });
+
+    it('nested container without disableEqualOverflow but parent has', () => {
+      const result = generateGridStyles({
+        ownerState: {
+          container: true,
+          nested: true,
+          disableEqualOverflow: false,
+          parentDisableEqualOverflow: true,
+        },
+      });
+      sinon.assert.match(result, {
+        margin: `calc(var(--Grid-rowSpacing) / -2) calc(var(--Grid-columnSpacing) / -2)`,
+        padding: `calc(var(--Grid-nested-rowSpacing)) 0px 0px calc(var(--Grid-nested-columnSpacing))`,
+      });
+    });
+
+    it('item', () => {
+      const result = generateGridStyles({ ownerState: { container: false, nested: false } });
+      expect(result).to.deep.equal({
+        minWidth: 0,
+        boxSizing: 'border-box',
+        padding: `calc(var(--Grid-rowSpacing) / 2) calc(var(--Grid-columnSpacing) / 2)`,
+      });
+    });
+
+    it('item with disableEqualOverflow', () => {
+      const result = generateGridStyles({
+        ownerState: { container: false, disableEqualOverflow: true },
+      });
+      sinon.assert.match(result, {
+        padding: `calc(var(--Grid-rowSpacing)) 0px 0px calc(var(--Grid-columnSpacing))`,
+      });
+    });
   });
 
   describe('generateGridSizeStyles', () => {

packages/mui-system/src/Unstable_Grid/gridGenerator.ts

@@ -194,9 +194,15 @@ export const generateGridStyles = ({ ownerState }: Props): {} => {
               flexWrap: ownerState.wrap,
             }),
           margin: `calc(var(--Grid-rowSpacing) / -2) calc(var(--Grid-columnSpacing) / -2)`,
+          ...(ownerState.disableEqualOverflow && {
+            margin: `calc(var(--Grid-rowSpacing) * -1) 0px 0px calc(var(--Grid-columnSpacing) * -1)`,
+          }),
           ...(ownerState.nested
             ? {
                 padding: `calc(var(--Grid-nested-rowSpacing) / 2) calc(var(--Grid-nested-columnSpacing) / 2)`,
+                ...((ownerState.disableEqualOverflow || ownerState.parentDisableEqualOverflow) && {
+                  padding: `calc(var(--Grid-nested-rowSpacing)) 0px 0px calc(var(--Grid-nested-columnSpacing))`,
+                }),
               }
             : {
                 '--Grid-nested-rowSpacing': 'var(--Grid-rowSpacing)',
@@ -205,6 +211,9 @@ export const generateGridStyles = ({ ownerState }: Props): {} => {
         }
       : {
           padding: `calc(var(--Grid-rowSpacing) / 2) calc(var(--Grid-columnSpacing) / 2)`,
+          ...(ownerState.disableEqualOverflow && {
+            padding: `calc(var(--Grid-rowSpacing)) 0px 0px calc(var(--Grid-columnSpacing))`,
+          }),
         }),
   };
 };