我有Header.js
组件。在它里面,我有两个AppBar,第一个AppBar是粘性的,第二个不是。默认情况下,仅显示第二个AppBar。当我们滚动时,我希望第二个AppBar折叠并且第一个AppBar显示在屏幕顶部。
我从Material-ui文档useScrollTrigger()
中看到了here,但它只显示在滚动时隐藏AppBar。
// Header.js
import React from "react";
import { AppBar, Toolbar, Typography } from "@material-ui/core";
export default function Header() {
return (
<>
<AppBar position="static">
<Toolbar>
<Typography variant="h6">First AppBar</Typography>
</Toolbar>
</AppBar>
<AppBar position="static">
<Toolbar>
<Typography variant="h6">Second AppBar</Typography>
</Toolbar>
</AppBar>
</>
);
}
这是我的沙箱link
此代码似乎按您的意愿运行。我使用了Material-ui demo
import React from "react";
import { AppBar, Toolbar, Typography } from "@material-ui/core";
import useScrollTrigger from '@material-ui/core/useScrollTrigger';
import Slide from '@material-ui/core/Slide';
function HideOnScroll(props) {
const { children, window } = props;
const trigger = useScrollTrigger({ target: window ? window() : undefined });
return (
<Slide appear={false} direction="down" in={!trigger}>
{children}
</Slide>
);
}
function ElevationScroll(props) {
const { children, window } = props;
const trigger = useScrollTrigger({
disableHysteresis: true,
threshold: 0,
target: window ? window() : undefined,
});
return React.cloneElement(children, {
elevation: trigger ? 4 : 0,
});
}
export default function Header(props) {
return (
<>
<ElevationScroll {...props}>
<AppBar>
<Toolbar>
<Typography variant="h6">First AppBar</Typography>
</Toolbar>
</AppBar>
</ElevationScroll >
{/* second appbar */}
<HideOnScroll {...props}>
<AppBar>
<Toolbar>
<Typography variant="h6">Second AppBar</Typography>
</Toolbar>
</AppBar>
</HideOnScroll>
</>
);
}