@fruits-chain/react-native-xiaoshu/lib/module/tab-bar/index.js

🌈 React Native UI library

function _extends() { _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; }; return _extends.apply(this, arguments); }

import isNil from 'lodash/isNil';
import React, { useState, useRef, memo, useCallback, useEffect } from 'react';
import { Text, TouchableOpacity, ScrollView, Animated } from 'react-native';
import BottomBar from '../bottom-bar';
import { varCreator as varCreatorButton } from '../button/style';
import { getDefaultValue } from '../helpers';
import { useControllableValue } from '../hooks';
import Theme from '../theme';
import { varCreator, styleCreator } from './style';

const TabBar = _ref => {
  var _options$;

  let {
    textColor,
    iconColor,
    activeTextColor,
    activeIconColor,
    options,
    indicator = false,
    indicatorWidth,
    indicatorHeight = 3,
    indicatorColor,
    tabAlign = 'center',
    height,
    style,
    ...restProps
  } = _ref;
  const tabNum = options.length;
  const isTabAdaption = tabAlign === 'center';
  const isTabTextCompact = isNil(indicatorWidth);
  const isIndicatorWidthLayout = isTabTextCompact || indicatorWidth === 0;
  const [value, onChange] = useControllableValue(restProps, {
    defaultValue: (_options$ = options[0]) === null || _options$ === void 0 ? void 0 : _options$.value
  });
  const TOKENS = Theme.useThemeTokens();
  const CV = Theme.createVar(TOKENS, varCreator);
  const CV_BUTTON = Theme.createVar(TOKENS, varCreatorButton);
  const STYLES = Theme.createStyle(CV, styleCreator);
  const [state, setState] = useState({
    layoutFinish: false
  });
  const layouts = useRef(new Array(tabNum).fill({}));
  const AnimatedIndicatorLeft = useRef(new Animated.Value(0));
  const AnimatedIndicatorWidth = useRef(new Animated.Value(0));
  const ScrollViewRef = useRef(null);
  const scrollViewWidth = useRef(0);

  if (indicator && isNil(height)) {
    height = 40;
  }

  textColor = getDefaultValue(textColor, CV.tab_bar_text_color);
  iconColor = getDefaultValue(iconColor, CV.tab_bar_icon_color);
  activeTextColor = getDefaultValue(activeTextColor, CV.tab_bar_active_text_color);
  activeIconColor = getDefaultValue(activeIconColor, CV.tab_bar_active_icon_color);
  indicatorColor = getDefaultValue(indicatorColor, CV.tab_bar_indicator_color);
  const navigateTo = useCallback(n => {
    const targetLayout = layouts.current[n];
    const left = targetLayout.tab.x + (targetLayout.tab.width - (isIndicatorWidthLayout ? targetLayout.text.width : indicatorWidth)) / 2;
    const width = isIndicatorWidthLayout ? targetLayout.text.width : indicatorWidth;
    Animated.parallel([Animated.timing(AnimatedIndicatorLeft.current, {
      toValue: left,
      useNativeDriver: false,
      duration: TOKENS.animation_duration_base
    }), Animated.timing(AnimatedIndicatorWidth.current, {
      toValue: width,
      useNativeDriver: false,
      duration: TOKENS.animation_duration_base
    })]).start();

    if (!isTabAdaption) {
      const hh = scrollViewWidth.current / 2;
      ScrollViewRef.current.scrollTo({
        x: targetLayout.tab.x + targetLayout.tab.width / 2 - hh,
        animated: true
      });
    }
  }, [TOKENS.animation_duration_base, indicatorWidth, isIndicatorWidthLayout, isTabAdaption]);
  const initIndicator = useCallback(() => {
    const layoutItems = layouts.current.filter(item => item.tab && item.text);

    if (layoutItems.length === layouts.current.length) {
      setState(s => ({ ...s,
        layoutFinish: true
      }));
    }
  }, []);
  useEffect(() => {
    if (state.layoutFinish) {
      const n = options.findIndex(item => item.value === value);
      navigateTo(n);
    }
  }, [value, options, state.layoutFinish, navigateTo]);
  const onLayoutScrollView = useCallback(e => {
    scrollViewWidth.current = e.nativeEvent.layout.width;
  }, []);

  const genOnPress = v => () => {
    onChange(v);
  };

  const genOnLayoutTab = i => e => {
    var _layouts$current$i;

    layouts.current[i] = {
      text: (_layouts$current$i = layouts.current[i]) === null || _layouts$current$i === void 0 ? void 0 : _layouts$current$i.text,
      tab: e.nativeEvent.layout
    };
    initIndicator();
  };

  const genOnLayoutText = i => e => {
    var _layouts$current$i2;

    layouts.current[i] = {
      tab: (_layouts$current$i2 = layouts.current[i]) === null || _layouts$current$i2 === void 0 ? void 0 : _layouts$current$i2.tab,
      text: e.nativeEvent.layout
    };
    initIndicator();
  };

  const tabs = options.map((item, index) => {
    var _item$iconRender;

    const isActive = item.value === value;
    return /*#__PURE__*/React.createElement(TouchableOpacity, {
      key: item.value,
      style: [STYLES.item, isTabAdaption ? STYLES.item_adaption : null, item.iconRender ? null : STYLES.item_no_icon],
      activeOpacity: CV_BUTTON.button_active_opacity,
      onPress: isActive ? undefined : genOnPress(item.value),
      onLayout: genOnLayoutTab(index)
    }, (_item$iconRender = item.iconRender) === null || _item$iconRender === void 0 ? void 0 : _item$iconRender.call(item, isActive ? activeIconColor : iconColor), /*#__PURE__*/React.createElement(Text, {
      style: [STYLES.item_text, isTabTextCompact ? null : STYLES.item_text_full, item.iconRender ? STYLES.item_text_icon : null, // eslint-disable-next-line react-native/no-inline-styles
      {
        color: isActive ? activeTextColor : textColor,
        fontWeight: isActive && indicator ? '500' : 'normal'
      }],
      onLayout: genOnLayoutText(index)
    }, item.label));
  });
  const indicatorJSX = indicator && state.layoutFinish ? /*#__PURE__*/React.createElement(Animated.View, {
    // eslint-disable-next-line react-native/no-inline-styles
    style: {
      height: indicatorHeight,
      width: AnimatedIndicatorWidth.current,
      backgroundColor: indicatorColor,
      position: 'absolute',
      left: AnimatedIndicatorLeft.current,
      bottom: 0
    }
  }) : null;
  return /*#__PURE__*/React.createElement(BottomBar, _extends({}, restProps, {
    height: height,
    style: [STYLES.tab_bar, style]
  }), isTabAdaption ? /*#__PURE__*/React.createElement(React.Fragment, null, tabs, indicatorJSX) : /*#__PURE__*/React.createElement(ScrollView, {
    onLayout: onLayoutScrollView,
    ref: ScrollViewRef,
    horizontal: true,
    bounces: false,
    showsHorizontalScrollIndicator: false,
    style: STYLES.tab_bar_scroll,
    contentContainerStyle: STYLES.tab_bar_scroll_content
  }, indicatorJSX, tabs));
};

export default /*#__PURE__*/memo(TabBar);
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