Can you explain the concepts of 'theme' and 'classes'?

Currently, I am working on a web application using React.

I have chosen to incorporate the latest version of Material-UI for designing the user interface.

During this process, I came across the demo examples provided by Material-UI (like )

In each demo code snippet, the terms "theme" and "classes" are used extensively, and I am curious to understand their significance in these examples.

The usage of theme and classes is illustrated below:

const styles = theme => ({
root: {
    width: '100%',
    height: 1300,
    marginTop: theme.spacing.unit * 3, <<<<<<<<<<<<<<<<< example
    zIndex: 1,
    overflow: 'hidden',
},
.
.
.

 render() {
    const { classes, theme } = this.props; <<<<<<<<<<<< incorporating classes / theme
    const { drawer_location, open } = this.state;
.
.
.
App.propTypes = {
classes: PropTypes.object.isRequired,
theme: PropTypes.object.isRequired, }

I would greatly appreciate if someone could explain how and why they are utilized in real-world applications.

My assumption is that these theme and classes are passed down from the parent component to the current one. If so, why are they being employed in the Material-UI demo codes? (Considering there is only one component).

Where can I find resources to learn more about implementing classes and themes effectively?

Thank you!

javascriptcssreactjsmaterial-uijsx

Answer №1

When you use the withStyles higher-order component in your code, it adds a property called classes to your component. This property holds the CSS class names that you have defined in your styles.

You can define your styles object as an object like this:

const styles = {
  root: {
    width: '100%',
    maxWidth: 360,
  },
};

Or as a function if you need access to the material-ui theme object:

const styles = theme => ({
  root: {
    width: '100%',
    maxWidth: 360,
  },
});

An example of using withStyles with a component named App:

export default withStyles(styles)(App);

The withStyles function takes your styles object or function and returns a function that accepts a component. The resulting component will have a classes prop which maps the class names from your styles to actual CSS class names in the document.

For more information on CSS in JS, overriding CSS classes, and the usage of withStyles, please refer to the documentation provided by Material-UI.

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