Hover styles in React Native for Web

createHoverMonitor.js

import { canUseDOM } from 'fbjs/lib/ExecutionEnvironment';

/**
 * Touch devices emulate mouse events. This functions makes it possible to know
 * if the current modality supports hover (including for multi-modality
 * devices).
 */
const createHoverMonitor = () => {
  let isHoverEnabled = false;
  let lastTouchTime = 0;

  function enableHover() {
    if (isHoverEnabled || Date.now() - lastTouchTime < 500) {
      return;
    }
    isHoverEnabled = true;
  }

  function disableHover() {
    lastTouchTime = new Date();
    if (isHoverEnabled) {
      isHoverEnabled = false;
    }
  }

  if (canUseDOM) {
    document.addEventListener('touchstart', disableHover, true);
    document.addEventListener('mousemove', enableHover, true);
  }

  return {
    get isEnabled() {
      return isHoverEnabled;
    }
  };
};

export default createHoverMonitor;

Hoverable.js

import createHoverMonitor from './createHoverMonitor';
import { element, func, oneOfType } from 'prop-types';
import React, { Component } from 'react';

const hover = createHoverMonitor();

/**
 * Use:
 * <Hoverable>
 *   {(hover) => <View style={hover && styles.hovered} />}
 * </Hoverable>
 *
 * Example: https://imaginary-lycra.glitch.me/
 * Example source: https://glitch.com/edit/#!/imaginary-lycra
 */
class Hoverable extends Component {
  static displayName = 'Hoverable';

  static propTypes = {
    children: oneOfType([func, element]).isRequired,
    onHoverIn: func,
    onHoverOut: func
  };

  state = { isHovered: false };

  _handleMouseEnter = e => {
    if (hover.isEnabled && !this.state.isHovered) {
      const { onHoverIn } = this.props;
      if (onHoverIn) {
        onHoverIn();
      }
      this.setState(() => ({ isHovered: true }));
    }
  };

  _handleMouseLeave = e => {
    if (this.state.isHovered) {
      const { onHoverOut } = this.props;
      if (onHoverOut) {
        onHoverOut();
      }
      this.setState(() => ({ isHovered: false }));
    }
  };

  render() {
    const {
      children,
      /* eslint-disable */
      onHoverIn,
      onHoverOut
      /* eslint-enable */
    } = this.props;

    const child = typeof children === 'function' ? children(this.state.isHovered) : children;

    return React.cloneElement(React.Children.only(child), {
      onMouseEnter: this._handleMouseEnter,
      onMouseLeave: this._handleMouseLeave
    });
  }
}

export default Hoverable;

Updated version on CodeSandbox: https://codesandbox.io/s/o9q8vy70l5

version with Hooks: https://codesandbox.io/s/react-native-hover-hooks-version-4oxpp

@horacioh

version with Hooks: https://codesandbox.io/s/react-native-hover-hooks-version-4oxpp

Very neat solution! Did anyone notice that after a click, the hover effect isn't performing anymore? Cool tricks!

gd

@horacioh

version with Hooks: https://codesandbox.io/s/react-native-hover-hooks-version-4oxpp

Very neat solution! Did anyone notice that after a click, the hover effect isn't performing anymore? Cool tricks!

I did! But I'm running almost the exact same code on a project and it's working great even after clicks.

I did! But I'm running almost the exact same code on a project and it's working great even after clicks.

Could you share your improved version (or atleast the changes) please @ianmartorell?

Could you share your improved version (or atleast the changes) please @ianmartorell?

Definitely! I don't really remember but I think the only thing I added were Typescript types really.

https://gist.github.com/ianmartorell/32bb7df95e5eff0a5ee2b2f55095e6a6

I've been using a version of this for a while, and it's been great! But it doesn't play nice with modals:

1. I'm hovering over a component
2. Click a button to open a modal
3. Click outside the modal to close it
4. The Hoverable is stuck in the wrong state because onHoverOut is never called, but my mouse is no longer hovering it.

Has anyone run into this? Any clever ideas for a solution?

Here's my implementation btw: https://github.com/Expensify/Expensify.cash/tree/3a59fc2d212c9dc6af9eab1292e48d1cacaafbc3/src/components/Hoverable

EDIT: Found a solution that works for me:

https://gist.github.com/roryabraham/65cd1d2d5e8a48da78fec6a6e3105398

I actually don't have that problem at all, using React Native Paper's Dialog.

Hoverable.mov

Here's my version, which uses TypeScript, hooks, and Reanimated shared values instead of re-renders: https://gist.github.com/nandorojo/066ff2f40419b7e06054cc7282e24f8d

In the code I'm working in, the render props pattern is something that is used seldomly. Instead a Pressable is used as a controlled component like so:

const [isHovered, setIsHovered] = useState(false);

return (
  <Pressable
    onHoverIn={() => setIsHovered(true)}
    onHoverOut={() => setisHovered(false)}
    style={ isHovered ? { backgroundColor: 'blue' } : {} }
  >
   ...
  </Pressable>
);

In this case, I was able to replace the onHoverIn and onHoverOut props with onMouseEnter and onMouseLeave and it works like a charm on react-native-web.

const [isHovered, setIsHovered] = useState(false);

return (
  <Pressable
    onMouseEnter={() => setIsHovered(true)}
    onMouseLeave={() => setisHovered(false)}
    style={ isHovered ? { backgroundColor: 'blue' } : {} }
  >
   ...
  </Pressable>
);

I think onHoverIn/Out is a better version of that which accounts for other conditions.

@nandorojo If you look closely at the gist, you will see that the hover is accomplished using the same approach. Only instead of appending the onMouseEnter and onMouseLeave props to the child and rendering the child using the render props pattern, the example I shared adds onMouseEnter and onMouseLeave explicitly.