@wordpress/components/build-module/mobile/segmented-control/index.native.js

UI components for WordPress.

import _extends from "@babel/runtime/helpers/esm/extends";
import { createElement } from "@wordpress/element";

/**
 * External dependencies
 */
import { View, TouchableWithoutFeedback, Text, Platform, Animated, Easing } from 'react-native';
import { take, values, map, reduce } from 'lodash';
/**
 * WordPress dependencies
 */

import { useState, useEffect } from '@wordpress/element';
import { usePreferredColorSchemeStyle } from '@wordpress/compose';
/**
 * Internal dependencies
 */

import { performLayoutAnimation } from '../layout-animation';
import styles from './style.scss';
const ANIMATION_DURATION = 200;
const isIOS = Platform.OS === 'ios';

const Segment = ({
  isSelected,
  title,
  onPress,
  onLayout,
  ...props
}) => {
  const isSelectedIOS = isIOS && isSelected;
  const segmentStyle = [styles.segment, isIOS && styles.segmentIOS];
  const textStyle = usePreferredColorSchemeStyle(styles.buttonTextDefault, styles.buttonTextDefaultDark);
  const selectedTextStyle = usePreferredColorSchemeStyle(styles.buttonTextSelected, styles.buttonTextSelectedDark);
  const shadowStyle = usePreferredColorSchemeStyle(styles.shadowIOS, {});
  return createElement(View, {
    style: isSelectedIOS && shadowStyle
  }, createElement(TouchableWithoutFeedback, {
    onPress: onPress
  }, createElement(View, _extends({
    style: segmentStyle,
    onLayout: onLayout
  }, props), createElement(Text, {
    style: [textStyle, isSelected && selectedTextStyle],
    maxFontSizeMultiplier: 2
  }, title))));
};

const SegmentedControls = ({
  segments,
  segmentHandler,
  selectedIndex,
  addonLeft,
  addonRight
}) => {
  const selectedSegmentIndex = selectedIndex || 0;
  const [activeSegmentIndex, setActiveSegmentIndex] = useState(selectedSegmentIndex);
  const [segmentsDimensions, setSegmentsDimensions] = useState({
    [activeSegmentIndex]: {
      width: 0,
      height: 0
    }
  });
  const [positionAnimationValue] = useState(new Animated.Value(0));
  useEffect(() => {
    setActiveSegmentIndex(selectedSegmentIndex);
    segmentHandler(segments[selectedSegmentIndex]);
  }, []);
  useEffect(() => {
    positionAnimationValue.setValue(calculateEndValue(activeSegmentIndex));
  }, [segmentsDimensions]);
  const containerStyle = usePreferredColorSchemeStyle(styles.container, styles.containerDark);

  function performSwatchAnimation(index) {
    Animated.timing(positionAnimationValue, {
      toValue: calculateEndValue(index),
      duration: ANIMATION_DURATION,
      easing: Easing.ease
    }).start();
  }

  function calculateEndValue(index) {
    const {
      paddingLeft: offset
    } = isIOS ? styles.containerIOS : styles.container;
    const widths = map(values(segmentsDimensions), 'width');
    const widthsDistance = take(widths, index);
    const widthsDistanceSum = reduce(widthsDistance, (sum, n) => sum + n);
    const endValue = index === 0 ? 0 : widthsDistanceSum;
    return endValue + offset;
  }

  function onHandlePress(segment, index) {
    performLayoutAnimation(ANIMATION_DURATION);
    setActiveSegmentIndex(index);
    segmentHandler(segment);
    performSwatchAnimation(index);
  }

  function segmentOnLayout(event, index) {
    const {
      width,
      height
    } = event.nativeEvent.layout;
    setSegmentsDimensions({ ...segmentsDimensions,
      [index]: {
        width,
        height
      }
    });
  }

  const selectedStyle = usePreferredColorSchemeStyle(styles.selected, styles.selectedDark);
  const width = segmentsDimensions[activeSegmentIndex].width;
  const height = segmentsDimensions[activeSegmentIndex].height;
  const outlineStyle = [styles.outline, isIOS && styles.outlineIOS];
  return createElement(View, {
    style: styles.row
  }, createElement(View, {
    style: styles.flex
  }, addonLeft), createElement(View, {
    style: [containerStyle, isIOS && styles.containerIOS]
  }, segments.map((segment, index) => {
    return createElement(Segment, {
      title: segment,
      onPress: () => onHandlePress(segment, index),
      isSelected: activeSegmentIndex === index,
      key: index,
      onLayout: event => segmentOnLayout(event, index),
      accessibilityState: {
        selected: activeSegmentIndex === index
      },
      accessibilityRole: 'button',
      accessibilityLabel: segment,
      accessibilityHint: `${index + 1} on ${segments.length}`
    });
  }), createElement(Animated.View, {
    style: [{
      width,
      left: positionAnimationValue,
      height
    }, selectedStyle, outlineStyle]
  })), createElement(View, {
    style: styles.flex
  }, addonRight));
};

export default SegmentedControls;
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