mattermost-mobile/app/components/radio_button/radio_button.js

// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.

import {connect} from 'react-redux';
import React, {PureComponent} from 'react';
import PropTypes from 'prop-types';
import {Animated, Text, View} from 'react-native';
import Icon from 'react-native-vector-icons/MaterialIcons';

import {getTheme} from 'mattermost-redux/selectors/entities/preferences';
import {makeStyleSheetFromTheme} from 'app/utils/theme';

const DISABLED_OPACITY = 0.26;
const DEFAULT_OPACITY = 1;

class RadioButton extends PureComponent {
    static propTypes = {
        label: PropTypes.string,
        theme: PropTypes.object,
        value: PropTypes.string,
        checked: PropTypes.bool,
        disabled: PropTypes.bool,
        onCheck: PropTypes.func
    };

    constructor(props) {
        super(props);
        this.state = {
            scaleValue: new Animated.Value(0.001),
            opacityValue: new Animated.Value(0.1)
        };

        this.responder = {
            onStartShouldSetResponder: () => true,
            onResponderGrant: this.highlight,
            onResponderRelease: this.handleResponderEnd,
            onResponderTerminate: this.unHighlight
        };
    }

    highlight = () => {
        Animated.timing(
            this.state.scaleValue,
            {
                toValue: 1,
                duration: 150
            }
        ).start();
        Animated.timing(
            this.state.opacityValue,
            {
                toValue: 0.1,
                duration: 100
            }
        ).start();
    };

    unHighlight = () => {
        Animated.timing(
            this.state.scaleValue,
            {
                toValue: 0.001,
                duration: 1500
            }
        ).start();
        Animated.timing(
            this.state.opacityValue,
            {
                toValue: 0
            }
        ).start();
    };

    handleResponderEnd = () => {
        const {checked, disabled, onCheck, value} = this.props;

        if (!checked && !disabled && onCheck) {
            onCheck(value);
        }

        this.unHighlight();
    };

    render() {
        const {scaleValue, opacityValue} = this.state;
        const {theme, checked, disabled} = this.props;
        const styles = getStyleSheet(theme);

        const color = checked ? theme.buttonBg : theme.centerChannelColor;
        const opacity = disabled ? DISABLED_OPACITY : DEFAULT_OPACITY;

        return (
            <View
                style={styles.container}
                {...this.responder}
            >
                <Animated.View
                    style={[
                        styles.ripple,
                        {
                            transform: [
                                {scale: scaleValue}
                            ],
                            opacity: opacityValue,
                            backgroundColor: color
                        }
                    ]}
                />
                <Icon
                    name={checked ? 'radio-button-checked' : 'radio-button-unchecked'}
                    size={24}
                    color={color}
                    style={{
                        opacity
                    }}
                />
                <View style={styles.labelContainer}>
                    <Text
                        style={[
                            styles.label,
                            {opacity: disabled ? DISABLED_OPACITY : DEFAULT_OPACITY}
                        ]}
                    >
                        {this.props.label}
                    </Text>
                </View>
            </View>
        );
    }
}

const getStyleSheet = makeStyleSheetFromTheme((theme) => {
    return {
        container: {
            flexDirection: 'row',
            alignItems: 'center',
            backgroundColor: 'rgba(0,0,0,0)',
            marginBottom: 15
        },
        ripple: {
            position: 'absolute',
            width: 48,
            height: 48,
            borderRadius: 56,
            top: 6
        },
        labelContainer: {
            flex: 1,
            flexDirection: 'row',
            justifyContent: 'center'
        },
        label: {
            color: theme.centerChannelColor,
            flex: 1,
            fontSize: 17,
            marginLeft: 15,
            textAlignVertical: 'center',
            includeFontPadding: false
        }
    };
});

function mapStateToProps(state, ownProps) {
    return {
        ...ownProps,
        theme: getTheme(state)
    };
}

export default connect(mapStateToProps)(RadioButton);