react-native-textinput-effects/lib/Fumi.js

import React, { PropTypes, Component } from 'react';
import {
  Animated,
  Text,
  TextInput,
  TouchableWithoutFeedback,
  View,
  StyleSheet,
} from 'react-native';

import BaseInput from './BaseInput';

const PADDING = 16;
const ICON_WIDTH = 40;

export default class Fumi extends BaseInput {

  static propTypes = {
    /*
     * This is the icon component you are importing from react-native-vector-icons.
     * import FontAwesomeIcon from 'react-native-vector-icons/FontAwesome';
     * iconClass={FontAwesomeIcon}
     */
    iconClass: PropTypes.func.isRequired,
    /*
     * Passed to react-native-vector-icons library as name prop
     */
    iconName: PropTypes.string.isRequired,
    /*
     * Passed to react-native-vector-icons library as color prop.
     * Also used as textInput color.
     */
    iconColor: PropTypes.string,
    height: PropTypes.number,
  };

  static defaultProps = {
    height: 48,
    iconColor: '#00aeef',
    animationDuration: 300,
  };

  render() {
    const {
      iconClass,
      iconColor,
      iconName,
      label,
      style: containerStyle,
      inputStyle,
      height: inputHeight,
      labelStyle,
    } = this.props;
    const { focusedAnim, value } = this.state;
    const AnimatedIcon = Animated.createAnimatedComponent(iconClass);
    const ANIM_PATH = PADDING + inputHeight;
    const NEGATIVE_ANIM_PATH = ANIM_PATH * -1;

    return (
      <View style={[containerStyle, styles.container]} onLayout={this._onLayout}>
        <TouchableWithoutFeedback onPress={this._focus}>
          <AnimatedIcon
            name={iconName}
            color={iconColor}
            size={20}
            style={{
              position: 'absolute',
              left: PADDING,
              bottom: focusedAnim.interpolate({
                inputRange: [0, 0.5, 0.51, 0.7, 1],
                outputRange: [24, ANIM_PATH, NEGATIVE_ANIM_PATH, NEGATIVE_ANIM_PATH, 24],
              }),
              color: focusedAnim.interpolate({
                inputRange: [0, 0.5, 1],
                outputRange: ['#a3a3a3', iconColor, iconColor],
              }),
            }}
          />
        </TouchableWithoutFeedback>
        <View
          style={[styles.separator, {
            height: inputHeight,
            left: ICON_WIDTH + 8,
          }]}
        />
        <TouchableWithoutFeedback onPress={this._focus}>
          <Animated.View style={{
            position: 'absolute',
            left: ICON_WIDTH + PADDING,
            height: inputHeight,
            top: focusedAnim.interpolate({
              inputRange: [0, 0.5, 0.51, 0.7, 1],
              outputRange: [24, ANIM_PATH, NEGATIVE_ANIM_PATH, NEGATIVE_ANIM_PATH, PADDING / 2],
            }),
          }}>
            <Animated.Text style={[styles.label, labelStyle, {
              fontSize: focusedAnim.interpolate({
                inputRange: [0, 0.7, 0.71, 1],
                outputRange: [16, 16, 12, 12],
              }),
              color: focusedAnim.interpolate({
                inputRange: [0, 0.7],
                outputRange: ['#696969', '#a3a3a3'],
              }),
            }]}>
              {label}
            </Animated.Text>
          </Animated.View>
        </TouchableWithoutFeedback>
        <TextInput
          ref="input"
          {...this.props}
          style={[styles.textInput, inputStyle, {
            marginLeft: ICON_WIDTH + PADDING,
            color: iconColor,
          }]}
          value={value}
          onBlur={this._onBlur}
          onFocus={this._onFocus}
          onChange={this._onChange}
          underlineColorAndroid={'transparent'}
        />
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    overflow: 'hidden',
    paddingTop: 16,
    backgroundColor: 'white',
  },
  label: {
    fontSize: 18,
    fontFamily: 'Arial',
    fontWeight: 'bold',
  },
  textInput: {
    flex: 1,
    color: 'black',
    fontSize: 18,
    padding: 7,
    paddingLeft: 0,
  },
  separator: {
    position: 'absolute',
    width: 1,
    backgroundColor: '#f0f0f0',
    marginTop: -8,
  },
});