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126 lines
4.8 KiB
Markdown
126 lines
4.8 KiB
Markdown
# Spacing
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<p class="description">A wide range of shorthand responsive margin and padding utility classes to modify an element's appearance.</p>
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## Notation
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The space utility converts shorthand margin and padding props to margin and padding CSS declarations. The props are named using the format `{property}{sides}`.
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Where _property_ is one of:
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- `m` - for classes that set _margin_
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- `p` - for classes that set _padding_
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Where _sides_ is one of:
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- `t` - for classes that set _margin-top_ or _padding-top_
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- `b` - for classes that set _margin-bottom_ or _padding-bottom_
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- `l` - for classes that set _margin-left_ or _padding-left_
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- `r` - for classes that set _margin-right_ or _padding-right_
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- `x` - for classes that set both _\*-left_ and _\*-right_
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- `y` - for classes that set both _\*-top_ and _\*-bottom_
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- blank - for classes that set a margin or padding on all 4 sides of the element
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## Transformation
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Depending on the input and the theme configuration, the following transformation is applied:
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- input: `number` & theme: `number`: the prop value is multiplied by the theme value.
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```jsx
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const theme = {
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spacing: 8,
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}
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<Box sx={{ m: -2 }} /> // margin: -16px;
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<Box sx={{ m: 0 }} /> // margin: 0px;
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<Box sx={{ m: 0.5 }} /> // margin: 4px;
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<Box sx={{ m: 2 }} /> // margin: 16px;
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```
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- input: `number` & theme: `array`: the prop value is used as the array index.
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```jsx
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const theme = {
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spacing: [0, 2, 3, 5, 8],
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}
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<Box sx={{ m: -2 }} /> // margin: -3px;
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<Box sx={{ m: 0 }} /> // margin: 0px;
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<Box sx={{ m: 2 }} /> // margin: 3px;
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```
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- input: `number` & theme: `function`: the function is called with the prop value.
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```jsx
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const theme = {
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spacing: value => value * 2,
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}
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<Box sx={{ m: 0 }} /> // margin: 0px;
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<Box sx={{ m: 2 }} /> // margin: 4px;
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```
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- input: `string`: the prop value is passed as raw CSS value.
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```jsx
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<Box sx={{ m: '2rem' }} /> // margin: 2rem;
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<Box sx={{ mx: 'auto' }} /> // margin-left: auto; margin-right: auto;
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```
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## Example
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{{"demo": "SpacingDemo.js", "defaultCodeOpen": false, "bg": true}}
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```jsx
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<Box sx={{ p: 1 }}>…
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<Box sx={{ m: 1 }}>…
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<Box sx={{ p: 2 }}>…
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```
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## Horizontal centering
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The CSS flex and grid display properties are often used to align elements at the center.
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However, you can also use `margin-left: auto;`, `margin-right: auto;`, and a width for horizontally centering:
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{{"demo": "HorizontalCentering.js", "defaultCodeOpen": false, "bg": true}}
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```jsx
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<Box sx={{ mx: 'auto', width: 200 }}>…
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```
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## API
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```js
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import { spacing } from '@mui/system';
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```
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| Import name | Prop | CSS property | Theme key |
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| :---------- | :--- | :------------------------------ | :--------------------------------------------------------------------------- |
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| `spacing` | `m` | `margin` | [`spacing`](/material-ui/customization/default-theme/?expand-path=$.spacing) |
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| `spacing` | `mt` | `margin-top` | [`spacing`](/material-ui/customization/default-theme/?expand-path=$.spacing) |
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| `spacing` | `mr` | `margin-right` | [`spacing`](/material-ui/customization/default-theme/?expand-path=$.spacing) |
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| `spacing` | `mb` | `margin-bottom` | [`spacing`](/material-ui/customization/default-theme/?expand-path=$.spacing) |
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| `spacing` | `ml` | `margin-left` | [`spacing`](/material-ui/customization/default-theme/?expand-path=$.spacing) |
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| `spacing` | `mx` | `margin-left`, `margin-right` | [`spacing`](/material-ui/customization/default-theme/?expand-path=$.spacing) |
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| `spacing` | `my` | `margin-top`, `margin-bottom` | [`spacing`](/material-ui/customization/default-theme/?expand-path=$.spacing) |
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| `spacing` | `p` | `padding` | [`spacing`](/material-ui/customization/default-theme/?expand-path=$.spacing) |
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| `spacing` | `pt` | `padding-top` | [`spacing`](/material-ui/customization/default-theme/?expand-path=$.spacing) |
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| `spacing` | `pr` | `padding-right` | [`spacing`](/material-ui/customization/default-theme/?expand-path=$.spacing) |
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| `spacing` | `pb` | `padding-bottom` | [`spacing`](/material-ui/customization/default-theme/?expand-path=$.spacing) |
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| `spacing` | `pl` | `padding-left` | [`spacing`](/material-ui/customization/default-theme/?expand-path=$.spacing) |
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| `spacing` | `px` | `padding-left`, `padding-right` | [`spacing`](/material-ui/customization/default-theme/?expand-path=$.spacing) |
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| `spacing` | `py` | `padding-top`, `padding-bottom` | [`spacing`](/material-ui/customization/default-theme/?expand-path=$.spacing) |
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_Some people find the prop shorthand confusing, you can use the full version if you prefer:_
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```diff
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-<Box sx={{ pt: 2 }} />
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+<Box sx={{ paddingTop: 2 }} />
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```
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```diff
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-<Box sx={{ px: 2 }} />
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+<Box sx={{ paddingX: 2 }} />
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```
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