react-native-screens/lib/module/native-stack/utils/getDefaultHeaderHeight.js

Native navigation primitives for your React Native app.

import { Platform } from 'react-native';
const formSheetModalHeight = 56;
export default function getDefaultHeaderHeight(layout, statusBarHeight, stackPresentation) {
  let isLargeHeader = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false;
  // default header heights
  let headerHeight = Platform.OS === 'android' ? 56 : 64;
  if (Platform.OS === 'ios') {
    const isLandscape = layout.width > layout.height;
    const isFormSheetModal = stackPresentation === 'modal' || stackPresentation === 'formSheet';
    if (isFormSheetModal && !isLandscape) {
      // `modal` and `formSheet` presentations do not take whole screen, so should not take the inset.
      statusBarHeight = 0;
    }
    if (Platform.isPad || Platform.isTV) {
      headerHeight = isFormSheetModal ? formSheetModalHeight : 50;
    } else {
      if (isLandscape) {
        headerHeight = 32;
      } else {
        if (isFormSheetModal) {
          headerHeight = formSheetModalHeight;
        } else {
          headerHeight = isLargeHeader ? 96 : 44;
        }
      }
    }
  }
  return headerHeight + statusBarHeight;
}
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