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fade.js
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fade.js
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import React from 'react';
import { Animated } from 'react-native';
import PropTypes from 'prop-types';
const START_VALUE = 0.5;
const END_VALUE = 1;
const DURATION = 500;
const useNativeDriver = true;
const isInteraction = false;
/**
* Create a repetitive fadein / fadeout animation
*/
const Fade = ({ children, style = {}, ...props }) => {
const animation = new Animated.Value(START_VALUE);
function start() {
Animated.sequence([
Animated.timing(animation, {
toValue: END_VALUE,
duration: DURATION,
isInteraction,
useNativeDriver,
}),
Animated.timing(animation, {
toValue: START_VALUE,
duration: DURATION,
isInteraction,
useNativeDriver,
}),
]).start((e) => {
if (e.finished) {
start();
}
});
}
start();
const customStyle = { opacity: animation };
return (
<Animated.View style={[style, customStyle]} {...props}>
{children}
</Animated.View>
);
};
Fade.propTypes = {
children: PropTypes.oneOfType([PropTypes.element, PropTypes.arrayOf(PropTypes.element)]),
};
Fade.defaultProps = {
children: null,
};
export default Fade;