Function PaperProvider

src/core/PaperProvider.tsx:23–120

(props: Props)

};

const PaperProvider = (props: Props) => {
  const isOnlyVersionInTheme =
    props.theme && Object.keys(props.theme).length === 1 && props.theme.version;

  const colorSchemeName =
    ((!props.theme || isOnlyVersionInTheme) && Appearance?.getColorScheme()) ||
    'light';

  const [reduceMotionEnabled, setReduceMotionEnabled] =
    React.useState<boolean>(false);
  const [colorScheme, setColorScheme] =
    React.useState<ColorSchemeName>(colorSchemeName);

  const handleAppearanceChange = (
    preferences: Appearance.AppearancePreferences
  ) => {
    const { colorScheme } = preferences;
    setColorScheme(colorScheme);
  };

  React.useEffect(() => {
    let subscription: NativeEventSubscription | undefined;

    if (!props.theme) {
      subscription = addEventListener(
        AccessibilityInfo,
        'reduceMotionChanged',
        setReduceMotionEnabled
      );
    }
    return () => {
      if (!props.theme) {
        subscription?.remove();
      }
    };
  }, [props.theme]);

  React.useEffect(() => {
    let appearanceSubscription: NativeEventSubscription | undefined;
    if (!props.theme || isOnlyVersionInTheme) {
      appearanceSubscription = Appearance?.addChangeListener(
        handleAppearanceChange
      ) as NativeEventSubscription | undefined;
    }
    return () => {
      if (!props.theme || isOnlyVersionInTheme) {
        if (appearanceSubscription) {
          appearanceSubscription.remove();
        } else {
          // @ts-expect-error: We keep deprecated listener remove method for backwards compat with old RN versions
          Appearance?.removeChangeListener(handleAppearanceChange);
        }
      }
    };
  }, [props.theme, isOnlyVersionInTheme]);

  const theme = React.useMemo(() => {
    const themeVersion = props.theme?.version || 3;