amis-rpc-design/node_modules/@react-navigation/elements/lib/module/Header/Header.js

import * as React from 'react';
import { Animated, Platform, StyleSheet, View } from 'react-native';
import { useSafeAreaFrame, useSafeAreaInsets } from 'react-native-safe-area-context';
import { getDefaultHeaderHeight } from './getDefaultHeaderHeight';
import { HeaderBackground } from './HeaderBackground';
import { HeaderShownContext } from './HeaderShownContext';
import { HeaderTitle } from './HeaderTitle';
const warnIfHeaderStylesDefined = styles => {
  Object.keys(styles).forEach(styleProp => {
    const value = styles[styleProp];
    if (styleProp === 'position' && value === 'absolute') {
      console.warn("position: 'absolute' is not supported on headerStyle. If you would like to render content under the header, use the 'headerTransparent' option.");
    } else if (value !== undefined) {
      console.warn(`${styleProp} was given a value of ${value}, this has no effect on headerStyle.`);
    }
  });
};
export function Header(props) {
  const insets = useSafeAreaInsets();
  const frame = useSafeAreaFrame();
  const isParentHeaderShown = React.useContext(HeaderShownContext);
  const {
    layout = frame,
    modal = false,
    title,
    headerTitle: customTitle,
    headerTitleAlign = Platform.select({
      ios: 'center',
      default: 'left'
    }),
    headerLeft,
    headerLeftLabelVisible,
    headerTransparent,
    headerTintColor,
    headerBackground,
    headerRight,
    headerTitleAllowFontScaling: titleAllowFontScaling,
    headerTitleStyle: titleStyle,
    headerLeftContainerStyle: leftContainerStyle,
    headerRightContainerStyle: rightContainerStyle,
    headerTitleContainerStyle: titleContainerStyle,
    headerBackgroundContainerStyle: backgroundContainerStyle,
    headerStyle: customHeaderStyle,
    headerShadowVisible,
    headerPressColor,
    headerPressOpacity,
    headerStatusBarHeight = isParentHeaderShown ? 0 : insets.top
  } = props;
  const defaultHeight = getDefaultHeaderHeight(layout, modal, headerStatusBarHeight);
  const {
    height = defaultHeight,
    minHeight,
    maxHeight,
    backgroundColor,
    borderBottomColor,
    borderBottomEndRadius,
    borderBottomLeftRadius,
    borderBottomRightRadius,
    borderBottomStartRadius,
    borderBottomWidth,
    borderColor,
    borderEndColor,
    borderEndWidth,
    borderLeftColor,
    borderLeftWidth,
    borderRadius,
    borderRightColor,
    borderRightWidth,
    borderStartColor,
    borderStartWidth,
    borderStyle,
    borderTopColor,
    borderTopEndRadius,
    borderTopLeftRadius,
    borderTopRightRadius,
    borderTopStartRadius,
    borderTopWidth,
    borderWidth,
    // @ts-expect-error: web support for shadow
    boxShadow,
    elevation,
    shadowColor,
    shadowOffset,
    shadowOpacity,
    shadowRadius,
    opacity,
    transform,
    ...unsafeStyles
  } = StyleSheet.flatten(customHeaderStyle || {});
  if (process.env.NODE_ENV !== 'production') {
    warnIfHeaderStylesDefined(unsafeStyles);
  }
  const safeStyles = {
    backgroundColor,
    borderBottomColor,
    borderBottomEndRadius,
    borderBottomLeftRadius,
    borderBottomRightRadius,
    borderBottomStartRadius,
    borderBottomWidth,
    borderColor,
    borderEndColor,
    borderEndWidth,
    borderLeftColor,
    borderLeftWidth,
    borderRadius,
    borderRightColor,
    borderRightWidth,
    borderStartColor,
    borderStartWidth,
    borderStyle,
    borderTopColor,
    borderTopEndRadius,
    borderTopLeftRadius,
    borderTopRightRadius,
    borderTopStartRadius,
    borderTopWidth,
    borderWidth,
    // @ts-expect-error: boxShadow is only for Web
    boxShadow,
    elevation,
    shadowColor,
    shadowOffset,
    shadowOpacity,
    shadowRadius,
    opacity,
    transform
  };

  // Setting a property to undefined triggers default style
  // So we need to filter them out
  // Users can use `null` instead
  for (const styleProp in safeStyles) {
    // @ts-expect-error: typescript wrongly complains that styleProp cannot be used to index safeStyles
    if (safeStyles[styleProp] === undefined) {
      // @ts-expect-error
      // eslint-disable-next-line @typescript-eslint/no-dynamic-delete
      delete safeStyles[styleProp];
    }
  }
  const backgroundStyle = [safeStyles, headerShadowVisible === false && {
    elevation: 0,
    shadowOpacity: 0,
    borderBottomWidth: 0
  }];
  const leftButton = headerLeft ? headerLeft({
    tintColor: headerTintColor,
    pressColor: headerPressColor,
    pressOpacity: headerPressOpacity,
    labelVisible: headerLeftLabelVisible
  }) : null;
  const rightButton = headerRight ? headerRight({
    tintColor: headerTintColor,
    pressColor: headerPressColor,
    pressOpacity: headerPressOpacity
  }) : null;
  const headerTitle = typeof customTitle !== 'function' ? props => /*#__PURE__*/React.createElement(HeaderTitle, props) : customTitle;
  return /*#__PURE__*/React.createElement(React.Fragment, null, /*#__PURE__*/React.createElement(Animated.View, {
    pointerEvents: "box-none",
    style: [StyleSheet.absoluteFill, {
      zIndex: 0
    }, backgroundContainerStyle]
  }, headerBackground ? headerBackground({
    style: backgroundStyle
  }) : headerTransparent ? null : /*#__PURE__*/React.createElement(HeaderBackground, {
    style: backgroundStyle
  })), /*#__PURE__*/React.createElement(Animated.View, {
    pointerEvents: "box-none",
    style: [{
      height,
      minHeight,
      maxHeight,
      opacity,
      transform
    }]
  }, /*#__PURE__*/React.createElement(View, {
    pointerEvents: "none",
    style: {
      height: headerStatusBarHeight
    }
  }), /*#__PURE__*/React.createElement(View, {
    pointerEvents: "box-none",
    style: styles.content
  }, /*#__PURE__*/React.createElement(Animated.View, {
    pointerEvents: "box-none",
    style: [styles.left, headerTitleAlign === 'center' && styles.expand, {
      marginStart: insets.left
    }, leftContainerStyle]
  }, leftButton), /*#__PURE__*/React.createElement(Animated.View, {
    pointerEvents: "box-none",
    style: [styles.title, {
      // Avoid the title from going offscreen or overlapping buttons
      maxWidth: headerTitleAlign === 'center' ? layout.width - ((leftButton ? headerLeftLabelVisible !== false ? 80 : 32 : 16) + Math.max(insets.left, insets.right)) * 2 : layout.width - ((leftButton ? 72 : 16) + (rightButton ? 72 : 16) + insets.left - insets.right)
    }, titleContainerStyle]
  }, headerTitle({
    children: title,
    allowFontScaling: titleAllowFontScaling,
    tintColor: headerTintColor,
    style: titleStyle
  })), /*#__PURE__*/React.createElement(Animated.View, {
    pointerEvents: "box-none",
    style: [styles.right, styles.expand, {
      marginEnd: insets.right
    }, rightContainerStyle]
  }, rightButton))));
}
const styles = StyleSheet.create({
  content: {
    flex: 1,
    flexDirection: 'row',
    alignItems: 'stretch'
  },
  title: {
    marginHorizontal: 16,
    justifyContent: 'center'
  },
  left: {
    justifyContent: 'center',
    alignItems: 'flex-start'
  },
  right: {
    justifyContent: 'center',
    alignItems: 'flex-end'
  },
  expand: {
    flexGrow: 1,
    flexBasis: 0
  }
});
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