问题描述
我想了解是否可以通过从用户处获取输入并管理状态来使用ThemeProvider来更改主题值。
我有一个包装在ThemeProvider中的应用程序,用于管理主题。
import styled from 'styled-components'
import { ThemeProvider } from 'styled-components'
import appTheme from './theme'
function App(props,theme) {
// const themeContext = useContext(ThemeContext)
const [themePrimary,setThemePrimary] = useState(appTheme.primary)
function changePrimaryColor(props) {
setThemePrimary(props)
appTheme.primary = props
}
...
return (
<ThemeProvider theme={theme}>
<Router>
<Switch>
<Route
path="/"
exact
render={({ match }) => {
return (
<Frame id="app-frame">
<AppHeader match={match} />
<Main>
<p>Home</p>
</Main>
</Frame>
)
}}
/>
...
在设置视图中,用户必须能够输入颜色值。
const ColorTest = styled.input`
background: ${props => theme.primary};
border: none;
margin-left: 50px;
`
...
const colorInputValue = useRef(null)
const handleColorSubmit = (e) => {
e.preventDefault()
}
const handleClick = () => {
const color = colorInputValue.current.value
props.changePrimaryColor(color)
console.log(color)
}
...
<PageSection>
<Form onSubmit={handleColorSubmit}>
<h2>Change primary color</h2>
<ColorInput placeholder="hex or string" ref={colorInputValue} />
<SubmitFormBtn type="submit" onClick={handleClick}>Change</SubmitFormBtn>
<ColorTest disabled></ColorTest>
</Form>
</PageSection>
(这里的ColorTest组件用于测试。实际上,它告诉我所有数据都正确传递并且颜色发生了变化。)
这是我的“主题”
const theme = {
primary: '#0068B6',secondary: '',text_color: '#555',text_light: '#fff',border: '#e3e3e3',drop_shadow: '3px 3px 3px rgba(0,0.3)',background: '#fff',background_secondary: '#f5f5f5',}
export default theme
该新值必须更改原色的颜色值并触发应用程序组件重新渲染。在不使用本地存储或数据库的情况下,如何做到这一点呢?
解决方法
您可以尝试以下操作。现在,您可以将updateTheme
函数传递给其他子组件。
我可能会从组件中取出defaultTheme
并将其作为道具(而不是导入的文件)传递。这意味着您可以将App
组件重复使用几个不同的默认主题。
import React,{ useState } from 'react';
import styled from 'styled-components';
import { ThemeProvider } from 'styled-components';
import { BrowserRouter as Router,Route,Switch } from 'react-router-dom'; // Not sure if this is your import
export default function App({
defaultTheme={
primary: '#0068B6',secondary: '',text_color: '#555',text_light: '#fff',border: '#e3e3e3',drop_shadow: '3px 3px 3px rgba(0,0.3)',background: '#fff',background_secondary: '#f5f5f5',},}) {
const [theme,setTheme] = useState(defaultTheme);
// update here is an object,e.g.,{ primary: '#333' }
const updateTheme = (update) => {
return setTheme({ ...theme,...update });
};
const paint = () => {
// If you're using something to generate the theme,you can put it here instead. For example () => createMuiTheme(theme).
return React.useMemo(() => ({ ...theme }),[theme]);
};
return (
<ThemeProvider theme={paint()}>
<Router>
<Switch>
<Route
exact
path='/'
render={() => <View theme={theme} updateTheme={updateTheme} />}
/>
</Switch>
</Router>
</ThemeProvider>
);
};
// Or use your hooks to get the theme
export default function View({ updateTheme,theme }) {
return (
<>
<div
style={{
backgroundColor: theme.primary,height: 100,width: 100,}}
/>
<button
onClick={() => updateTheme({ primary: '#333' })}
>
Change primary
</button>
</>
);
};