我试图理解这个代码示例,https://codesandbox.io/s/9rvlm ,来自 Material UI 文档中的示例 ( https://material-ui.com/components/grid/ ):
import React from 'react';
import PropTypes from 'prop-types';
import { withStyles } from '@material-ui/core/styles';
import Paper from '@material-ui/core/Paper';
import Grid from '@material-ui/core/Grid';
const styles = theme => ({
root: {
flexGrow: 1,
},
paper: {
padding: theme.spacing(2),
textAlign: 'center',
color: theme.palette.text.secondary,
},
});
function CenteredGrid(props) {
const { classes } = props;
return (
<div className={classes.root}>
<Grid container spacing={3}>
<Grid item xs={12}>
<Paper className={classes.paper}>xs=12</Paper>
</Grid>
<Grid item xs={6}>
<Paper className={classes.paper}>xs=6</Paper>
</Grid>
<Grid item xs={6}>
<Paper className={classes.paper}>xs=6</Paper>
</Grid>
<Grid item xs={3}>
<Paper className={classes.paper}>xs=3</Paper>
</Grid>
<Grid item xs={3}>
<Paper className={classes.paper}>xs=3</Paper>
</Grid>
<Grid item xs={3}>
<Paper className={classes.paper}>xs=3</Paper>
</Grid>
<Grid item xs={3}>
<Paper className={classes.paper}>xs=3</Paper>
</Grid>
</Grid>
</div>
);
}
CenteredGrid.propTypes = {
classes: PropTypes.object.isRequired,
};
export default withStyles(styles)(CenteredGrid);
我的问题是:分配
flexGrow: 1
的目的是什么?给 parent div
元素?据我了解 https://material-ui.com/system/flexbox/#flex-grow和 https://developer.mozilla.org/en-US/docs/Web/CSS/flex-grow ,
flex-grow
是 flex 容器项的 CSS 属性。但是在这个例子中,我没有看到包含这个组件的 flex 容器元素; CenteredGrid
直接在根 div 中显示(如 <Demo/>
)。是
styles.root
应用于父 div '以防万一' 组件在 flex 容器中呈现?我希望得到一些澄清。
最佳答案
上面提到的安东尼的评论对我来说似乎是正确的答案。如果父组件设置为 display:flex 并且正在加载的子组件没有 flex:1 或 flex-grow:1 则它不会占用父组件的 100% 宽度。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JS Bin</title>
</head>
<body>
<div style="border:1px solid black; padding:2px; ">
<div style="border:1px solid red; ">parent is not flex container - child div takes 100% width</div>
</div>
<br/>
<div style="border:1px solid black; padding:2px; ">
<div style="border:1px solid red; flex-grow:1; ">parent is not flex container - child div takes 100% width</div>
</div>
<br/>
<div style="border:1px solid black; padding:2px; display:flex; ">
<div style="border:1px solid red; ">parent is flex container - sorry</div>
</div>
<br/>
<div style="border:1px solid black; padding:2px; display:flex; ">
<div style="border:1px solid red; display:flex; flex-grow:1;">parent is flex container - child div takes 100%</div>
</div>
</body>
</html>
关于css - flexGrow 在 Material UI 网格的父 div 中的用途?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/56386216/