react-motion

What is react-motion?

react-motion is a popular library for creating animations in React applications. It leverages the physics-based animation approach to create smooth and natural transitions. The library is highly flexible and allows developers to animate various properties of their components with ease.

What are react-motion's main functionalities?

Basic Animation

This example demonstrates a basic animation where a div element moves horizontally from 0 to 100 pixels using the spring function.

```jsx
import React from 'react';
import { Motion, spring } from 'react-motion';

const BasicAnimation = () => (
  <Motion defaultStyle={{ x: 0 }} style={{ x: spring(100) }}>
    {style => <div style={{ transform: `translateX(${style.x}px)` }}>Hello World</div>}
  </Motion>
);

export default BasicAnimation;
```

Staggered Motion

This example shows how to create a staggered animation where multiple items move one after another, creating a cascading effect.

```jsx
import React from 'react';
import { StaggeredMotion, spring } from 'react-motion';

const StaggeredAnimation = () => (
  <StaggeredMotion
    defaultStyles={[{ x: 0 }, { x: 0 }, { x: 0 }]}
    styles={prevInterpolatedStyles => prevInterpolatedStyles.map((_, i) => {
      return i === 0
        ? { x: spring(100) }
        : { x: spring(prevInterpolatedStyles[i - 1].x) };
    })}
  >
    {interpolatingStyles => (
      <div>
        {interpolatingStyles.map((style, i) => (
          <div key={i} style={{ transform: `translateX(${style.x}px)` }}>Item {i}</div>
        ))}
      </div>
    )}
  </StaggeredMotion>
);

export default StaggeredAnimation;
```

Transition Motion

This example demonstrates how to use TransitionMotion to animate the addition and removal of items in a list, with smooth transitions for entering and leaving elements.

```jsx
import React from 'react';
import { TransitionMotion, spring } from 'react-motion';

class TransitionAnimation extends React.Component {
  state = { items: ['a', 'b', 'c'] };

  willEnter() {
    return { opacity: 0 };
  }

  willLeave() {
    return { opacity: spring(0) };
  }

  render() {
    return (
      <TransitionMotion
        styles={this.state.items.map(item => ({ key: item, style: { opacity: spring(1) } }))}
        willEnter={this.willEnter}
        willLeave={this.willLeave}
      >
        {interpolatedStyles => (
          <div>
            {interpolatedStyles.map(config => (
              <div key={config.key} style={{ opacity: config.style.opacity }}>{config.key}</div>
            ))}
          </div>
        )}
      </TransitionMotion>
    );
  }
}

export default TransitionAnimation;
```

Other packages similar to react-motion

react-spring

react-spring is a spring-physics based animation library that is highly flexible and performant. It provides a more modern API compared to react-motion and supports hooks, making it a popular choice for new React projects.

framer-motion

framer-motion is a powerful animation library that offers a simple and declarative API for creating animations. It supports keyframes, spring animations, and gestures, and is known for its ease of use and rich feature set.

react-transition-group

react-transition-group is a low-level animation library that provides more control over the animation lifecycle. It is often used for more complex animations where developers need fine-grained control over the transition states.

README

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