ActionButton.js

import React, {
  Component
} from 'react';
import {
  StyleSheet,
  Text,
  View,
  Animated,
  TouchableOpacity,
  TouchableWithoutFeedback,
} from 'react-native';
import ActionButtonItem from './ActionButtonItem';

const alignMap = {
  center: {
    alignItems: 'center',
    justifyContent: 'flex-end',
    startDegree: 180,
    endDegree: 360,
  },

  left: {
    alignItems: 'flex-start',
    justifyContent: 'flex-end',
    startDegree: 270,
    endDegree: 360,
  },

  right: {
    alignItems: 'flex-end',
    justifyContent: 'flex-end',
    startDegree: 180,
    endDegree: 270,
  },
};

export default class ActionButton extends Component {

  constructor(props) {
    super(props);
    this.state = {
      active: props.active,
      anim: new Animated.Value(props.active ? 1 : 0),
    };

    this.timeout = null;
    this.getActionContainerStyle = this.getActionContainerStyle.bind(this);
  }

  componentWillUnmount() {
    clearTimeout(this.timeout);
  }

  getActionButtonStyle() {
    return [styles.actionBarItem, this.getButtonSize()];
  }

  getActionContainerStyle() {
    const {alignItems, justifyContent} = alignMap[this.props.position];
    return [styles.overlay, styles.actionContainer, {
      alignItems,
      justifyContent,
    }, this.props.containerStyle];
  }
  getActionsStyle() {
    return [this.getButtonSize()];
  }

  getButtonSize() {
    return {
      width: this.props.size,
      height: this.props.size,
    };
  }


  animateButton() {
    if (this.state.active) {
      this.reset();
      return;
    }

    Animated.spring(this.state.anim, {
      toValue: 1,
      duration: 250,
    }).start();

    this.setState({ active: true });
  }

  reset() {
    Animated.spring(this.state.anim, {
      toValue: 0,
      duration: 250,
    }).start();

    setTimeout(() => {
      this.setState({ active: false });
    }, 250);
  }

  renderButton() {
    return (
      <View
        style={this.getActionButtonStyle()}
      >
        <TouchableOpacity
          activeOpacity={0.85}
          onLongPress={this.props.onLongPress}
          onPress={() => {
              this.props.onPress();
              if (this.props.children) {
                this.animateButton();
              }
            }}
        >
          <Animated.View
            style={
              [
                styles.btn,
                {
                  width: this.props.size,
                  height: this.props.size,
                  borderRadius: this.props.size / 2,
                  backgroundColor: this.state.anim.interpolate({
                    inputRange: [0, 1],
                    outputRange: [this.props.buttonColor, this.props.btnOutRange]
                  }),
                  transform: [
                    {
                      scale: this.state.anim.interpolate({
                        inputRange: [0, 1],
                        outputRange: [1, this.props.outRangeScale]
                      }),
                    },
                    {
                      rotate: this.state.anim.interpolate({
                        inputRange: [0, 1],
                        outputRange: ['0deg', this.props.degrees + 'deg']
                      }),
                    }],
                }]}>
            {this.renderButtonIcon()}
          </Animated.View>
        </TouchableOpacity>
      </View>
    );
  }

  renderButtonIcon() {
    if (this.props.icon) {
      return this.props.icon;
    }

    return (
      <Animated.Text
        style={[styles.btnText,
                {
                  color: this.state.anim.interpolate({
                    inputRange: [0, 1],
                    outputRange: [this.props.buttonTextColor, this.props.btnOutRangeTxt]
                  })
                }]}>
        +
      </Animated.Text>
    );
  }

  renderActions() {
    if (!this.state.active) return null;
    const startDegree = this.props.startDegree || alignMap[this.props.position].startDegree;
    const endDegree = this.props.endDegree || alignMap[this.props.position].endDegree;
    const startRadian = startDegree * Math.PI / 180;
    const endRadian = endDegree * Math.PI / 180;

    const childrenCount = React.Children.count(this.props.children);
    let offset = 0;
    if (childrenCount !== 1) {
      offset = (endRadian - startRadian) / (childrenCount - 1);
    }

    return (
      React.Children.map(this.props.children, (button, index) => {
        return (

          <View
            pointerEvents="box-none"
            style={this.getActionContainerStyle()}
          >
            <ActionButtonItem
              key={index}
              position={this.props.position}
              anim={this.state.anim}
              size={this.props.itemSize}
              radius={this.props.radius}
              angle={startRadian + index * offset}
              btnColor={this.props.btnOutRange}
              {...button.props}
              onPress={() => {
                  if (this.props.autoInactive) {
                    this.timeout = setTimeout(() => {
                      this.reset();
                    }, 200);
                  }
                  button.props.onPress();
                }}
            />
          </View>
        );
      })
    );
  }


  render() {
    let backdrop;
    if (this.state.active) {
      backdrop = (
        <TouchableWithoutFeedback
          style={styles.overlay}
          onPress={() => {this.reset(); this.props.onOverlayPress()}}
        >
          <Animated.View
            style={
              {
                backgroundColor: this.props.bgColor,
                opacity: this.state.anim,
                flex: 1,
              }
                  }
          >
            {this.props.backdrop}
          </Animated.View>
        </TouchableWithoutFeedback>
      );
    }
    return (
      <View
        pointerEvents="box-none"
        style={styles.overlay}
      >
        {backdrop}

        {this.props.children && this.renderActions()}
        <View
          pointerEvents="box-none"
          style={this.getActionContainerStyle()}
        >
          {this.renderButton()}
        </View>
      </View>
    );
  }
}

ActionButton.Item = ActionButtonItem;

ActionButton.defaultProps = {
  active: false,
  bgColor: 'transparent',
  buttonColor: 'rgba(0,0,0,1)',
  buttonTextColor: 'rgba(255,255,255,1)',
  position: 'center',
  outRangeScale: 1,
  autoInactive: true,
  onPress: () => {},
  onOverlayPress: () => {},
  backdrop: false,
  degrees: 135,
  size: 63,
  itemSize: 36,
  radius: 100,
  btnOutRange: 'rgba(0,0,0,1)',
  btnOutRangeTxt: 'rgba(255,255,255,1)',
};

const styles = StyleSheet.create({
  overlay: {
    position: 'absolute',
    bottom: 0,
    left: 0,
    right: 0,
    top: 0,
    backgroundColor: 'transparent',
  },
  actionContainer: {
    flexDirection: 'column',
    padding: 10,
  },
  actionBarItem: {
    alignItems: 'center',
    justifyContent: 'center',
    backgroundColor: 'transparent',
  },
  btn: {
    justifyContent: 'center',
    alignItems: 'center',
    shadowOpacity: 0.3,
    shadowOffset: {
      width: 0,
      height: 1,
    },
    shadowColor: '#444',
    shadowRadius: 1,
  },
  btnText: {
    marginTop: -4,
    fontSize: 24,
    backgroundColor: 'transparent',
    position: 'relative',
  },
});