Rocket.Chat.ReactNative/app/containers/MessageBox/AnimatedContainer.js

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import React from 'react';
import PropTypes from 'prop-types';
import { Animated } from 'react-native';
export default class MessageBox extends React.PureComponent {
static propTypes = {
subview: PropTypes.object.isRequired,
visible: PropTypes.bool.isRequired,
messageboxHeight: PropTypes.number.isRequired
}
constructor(props) {
super(props);
this.animatedBottom = new Animated.Value(0);
}
componentWillReceiveProps(nextProps) {
if (this.props.visible === nextProps.visible) {
return;
}
if (nextProps.visible) {
return this.show();
}
this.hide();
}
show() {
this.animatedBottom.setValue(0);
Animated.timing(this.animatedBottom, {
toValue: 1,
duration: 300,
useNativeDriver: true
}).start();
}
hide() {
Animated.timing(this.animatedBottom, {
toValue: 0,
duration: 300,
useNativeDriver: true
}).start();
}
render() {
const bottom = this.animatedBottom.interpolate({
inputRange: [0, 1],
outputRange: [0, -this.props.messageboxHeight - 200]
});
return (
<Animated.View
style={{
position: 'absolute',
left: 0,
right: 0,
bottom: -200,
zIndex: 1,
transform: [{ translateY: bottom }]
}}
>
{this.props.subview}
</Animated.View>
);
}
}