javascript - React 类组件 - 基于 props 的条件样式

Question

我正在使用旧版本的 material-ui，无法升级。
我正在尝试根据 Prop 的一些组合来更改 Paper 组件的背景。我认为要求使用 makeStyles HOC 并不复杂。这可能吗？
我认为问题在于这一行:
类={{ 根:正确背景颜色.root }}
但是 https://v0.material-ui.com/#/components/paper 上的文档无济于事地说“其他属性(未记录)应用于根元素。”

import React from "react";

const correctBackgroundColor = {
  root: {
    width: 30,
    height: 30,
    border: "1px solid lightgrey",
    backgroundColor: props => {
      if (props.ledIsOn === true && props.ledColorType === "Green") {
        return "#00FF00";
      }
      if (props.ledIsOn === true && props.ledColorType === "Orange") {
        return "#FFA500";
      } 
    }
  }
};

class ColorChange extends React.Component {
  render() {
    const { classes } = this.props;
    let textToRender = (
      <Paper
        id={this.props.id}
        classes={{ root: correctBackgroundColor.root }}
      />
    );
    return (
      <div>
        <Typography variant="p" className={classes.typography_root}>
          {this.props.textLabel}
        </Typography>
        {textToRender}
      </div>
    );
  }
}

export default withStyles(styles)(ColorChange);

有一个沙箱: https://codesandbox.io/s/adoring-bell-oyzsn蒂亚!

Answer 1

我希望我说对了。您应该注意两点:
一、correctBackgroundColor无法识别 props因为这超出了范围，因此，我建议将其更改为函数，将 Prop 传递给它，并使函数返回 style object .
第二件事，我会使用 style将对象应用于 Paper 时, 所以那篇论文的风格是调用 correctBackgroundColor与 props ， 像这样:

<Paper id={this.props.id} style={correctBackgroundColor(this.props)} />

最终代码:

import React from "react";
import withStyles from "@material-ui/core/styles/withStyles";
import Typography from "@material-ui/core/Typography/Typography";
import Paper from "@material-ui/core/Paper/Paper";

const styles = theme => ({
  typography_root: {
    fontSize: 12,
    margin: 10
  }
});
const correctBackgroundColor = props => {
  let bgSwitch = "none";
  if (props.ledIsOn === true && props.ledColorType === "Green")
    bgSwitch = "#00FF00";
  if (props.ledIsOn === true && props.ledColorType === "Orange")
    bgSwitch = "#FFA500";
  if (props.ledIsOn === true && props.ledColorType === "Red")
    bgSwitch = "#FF0000";
  if (props.ledIsOn === true && props.ledColorType === "Grey")
    bgSwitch = "lightGrey";
  return {
    width: 30,
    height: 30,
    border: "1px solid lightgrey",
    backgroundColor: bgSwitch
  };
};

class ColorChange extends React.Component {
  render() {
    const { classes } = this.props;
    let textToRender = (
      <Paper id={this.props.id} style={correctBackgroundColor(this.props)} />
    );
    return (
      <div>
        <Typography variant="p" className={classes.typography_root}>
          {this.props.textLabel}
        </Typography>
        {textToRender}
      </div>
    );
  }
}

export default withStyles(styles)(ColorChange); //with styles injects classes props with styles contained.

Code Sandbox