react-native-paper/lib/module/components/TextInput/Label/LabelBackground.js

Material design for React Native

import * as React from 'react';
import { Animated, StyleSheet } from 'react-native';
import AnimatedText from '../../Typography/AnimatedText';
const LabelBackground = _ref => {
  let {
    labeled,
    labelLayoutWidth,
    labelLayoutHeight,
    placeholderStyle,
    baseLabelTranslateX,
    topPosition,
    backgroundColor,
    roundness,
    labelStyle,
    maxFontSizeMultiplier,
    testID
  } = _ref;
  const opacity = labeled.interpolate({
    inputRange: [0, 0.6],
    outputRange: [1, 0]
  });
  const labelTranslationX = {
    translateX: labeled.interpolate({
      inputRange: [0, 1],
      outputRange: [-baseLabelTranslateX, 0]
    })
  };
  const labelTextScaleY = {
    scaleY: labeled.interpolate({
      inputRange: [0, 1],
      outputRange: [0.2, 1]
    })
  };
  const labelTextTransform = [...labelStyle.transform, labelTextScaleY];
  const isRounded = roundness > 6;
  const roundedEdgeCover = isRounded ? /*#__PURE__*/React.createElement(Animated.View, {
    key: "labelBackground-view",
    pointerEvents: "none",
    style: [StyleSheet.absoluteFill, styles.view, {
      backgroundColor,
      maxHeight: Math.max(roundness / 3, 2),
      bottom: Math.max(roundness, 2),
      transform: [labelTranslationX],
      opacity
    }]
  }) : null;
  return [roundedEdgeCover, /*#__PURE__*/React.createElement(AnimatedText, {
    key: "labelBackground-text",
    testID: `${testID}-label-background`,
    style: [placeholderStyle, labelStyle, styles.outlinedLabel, {
      top: topPosition + 1,
      width: labelLayoutWidth - placeholderStyle.paddingHorizontal,
      height: labelLayoutHeight,
      backgroundColor,
      opacity,
      transform: labelTextTransform
    }],
    numberOfLines: 1,
    maxFontSizeMultiplier: maxFontSizeMultiplier
  })];
};
export default LabelBackground;
const styles = StyleSheet.create({
  view: {
    position: 'absolute',
    top: 6,
    left: 10,
    width: 12
  },
  // eslint-disable-next-line react-native/no-color-literals
  outlinedLabel: {
    position: 'absolute',
    left: 8,
    paddingHorizontal: 0,
    color: 'transparent'
  }
});
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