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

React Native UI library

import React, { useRef, useCallback, useState, memo } from 'react';
import { Animated, View, TouchableHighlight } from 'react-native';
import { getArrowOutline } from '../icon/helper/arrow';
import { usePersistFn, useUpdateEffect } from '../hooks';
import { easing, renderTextLikeJSX, isValue } from '../helpers';
import { useTheme, widthStyle } from '../theme';
import { createStyles } from './style';
/**
 * Collapse 折叠面板
 */

const Collapse = _ref => {
  let {
    children,
    title,
    titleStyle,
    titleTextStyle,
    iconStyle,
    iconColor,
    iconSize,
    bodyStyle,
    renderTitle,
    renderBody,
    defaultCollapse,
    collapse,
    onAnimationEnd,
    bodyPadding = true
  } = _ref;
  const THEME_VAR = useTheme();
  const STYLES = widthStyle(THEME_VAR, createStyles);
  const onAnimationEndPersistFn = usePersistFn(v => {
    onAnimationEnd === null || onAnimationEnd === void 0 ? void 0 : onAnimationEnd(v);
  });
  /** 记录当前是否课件，在不断 onLayout 的时候可以有一个判断的依据 */

  const Visible = useRef(isValue(collapse) ? collapse : isValue(defaultCollapse) ? defaultCollapse : false);
  const HeightMap = useRef({
    start: 0,
    end: 0
  });
  const [show, setShow] = useState(Visible.current);
  const AnimatedValue = useRef(new Animated.Value(0)).current;
  const setVisible = useCallback(v => {
    Visible.current = v; // 展开的时候立即响应

    if (v) {
      setShow(v);
    }

    const action = Animated.timing(AnimatedValue, {
      toValue: v ? HeightMap.current.start + HeightMap.current.end : HeightMap.current.start,
      duration: THEME_VAR.collapse_transition_duration,
      useNativeDriver: false,
      easing: v ? easing.easeOutCirc : easing.easeInCubic
    });
    action.start(_ref2 => {
      let {
        finished
      } = _ref2;

      if (finished) {
        // 收起的时候等待动画结束再响应
        if (!v) {
          setShow(v);
        }

        onAnimationEndPersistFn(v);
      }
    });
  }, [AnimatedValue, onAnimationEndPersistFn, THEME_VAR.collapse_transition_duration]);
  useUpdateEffect(() => {
    if (collapse !== Visible.current) {
      // 同步外界状态
      setVisible(!Visible.current);
    }
  }, [collapse, setVisible]); // title 是否要自定义渲染

  if (renderTitle) {
    title = renderTitle(show);
  }

  const onPressTitle = useCallback(() => {
    setVisible(!Visible.current);
  }, [setVisible]);
  const onLayoutTitle = useCallback(e => {
    HeightMap.current.start = e.nativeEvent.layout.height;

    if (!Visible.current) {
      setVisible(false);
    }
  }, [setVisible]);
  const onLayoutBody = useCallback(e => {
    // 有点疑惑，折叠的过程中，高度在动态变化
    HeightMap.current.end = e.nativeEvent.layout.height;

    if (Visible.current) {
      setVisible(true);
    }
  }, [setVisible]);
  const titleJSX = renderTextLikeJSX(title, [STYLES.title_text, titleTextStyle]);
  const ArrowOutline = getArrowOutline(show ? 'up' : 'down');
  return /*#__PURE__*/React.createElement(Animated.View, {
    style: [STYLES.collapse, {
      height: AnimatedValue
    }]
  }, /*#__PURE__*/React.createElement(TouchableHighlight, {
    underlayColor: THEME_VAR.cell_active_color,
    onPress: onPressTitle,
    onLayout: onLayoutTitle
  }, /*#__PURE__*/React.createElement(View, {
    style: [STYLES.title, titleStyle]
  }, titleJSX, /*#__PURE__*/React.createElement(ArrowOutline, {
    style: iconStyle,
    color: isValue(iconColor) ? iconColor : THEME_VAR.collapse_title_icon_color,
    size: isValue(iconSize) ? iconSize : THEME_VAR.collapse_title_icon_size
  }))), /*#__PURE__*/React.createElement(View, {
    collapsable: false,
    onLayout: onLayoutBody,
    style: [STYLES.body, bodyPadding ? STYLES.body_padding : null, bodyStyle]
  }, renderBody ? renderBody(show) : children));
};

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