@wordpress/components/build-module/mobile/keyboard-avoiding-view/index.ios.js

UI components for WordPress.

import _extends from "@babel/runtime/helpers/esm/extends";
import { createElement } from "@wordpress/element";

/**
 * External dependencies
 */
import { KeyboardAvoidingView as IOSKeyboardAvoidingView, Animated, Keyboard, Dimensions, View } from 'react-native';
import SafeArea from 'react-native-safe-area';
/**
 * WordPress dependencies
 */

import { useEffect, useRef, useState } from '@wordpress/element';
import { useResizeObserver } from '@wordpress/compose';
/**
 * Internal dependencies
 */

import styles from './styles.scss';
const AnimatedKeyboardAvoidingView = Animated.createAnimatedComponent(IOSKeyboardAvoidingView);
const MIN_HEIGHT = 44;
export const KeyboardAvoidingView = ({
  parentHeight,
  style,
  withAnimatedHeight = false,
  ...otherProps
}) => {
  const [resizeObserver, sizes] = useResizeObserver();
  const [isKeyboardOpen, setIsKeyboardOpen] = useState(false);
  const [safeAreaBottomInset, setSafeAreaBottomInset] = useState(0);
  const {
    height = 0
  } = sizes || {};
  const animatedHeight = useRef(new Animated.Value(MIN_HEIGHT)).current;
  const {
    height: fullHeight
  } = Dimensions.get('window');
  const keyboardVerticalOffset = fullHeight - parentHeight;
  useEffect(() => {
    SafeArea.getSafeAreaInsetsForRootView().then(({
      safeAreaInsets
    }) => {
      setSafeAreaBottomInset(safeAreaInsets.bottom);
    });
    SafeArea.addEventListener('safeAreaInsetsForRootViewDidChange', onSafeAreaInsetsUpdate);
    Keyboard.addListener('keyboardWillShow', onKeyboardWillShow);
    Keyboard.addListener('keyboardWillHide', onKeyboardWillHide);
    return () => {
      SafeArea.removeEventListener('safeAreaInsetsForRootViewDidChange', onSafeAreaInsetsUpdate);
      Keyboard.removeListener('keyboardWillShow', onKeyboardWillShow);
      Keyboard.removeListener('keyboardWillHide', onKeyboardWillHide);
    };
  }, []);

  function onSafeAreaInsetsUpdate({
    safeAreaInsets
  }) {
    setSafeAreaBottomInset(safeAreaInsets.bottom);
  }

  function onKeyboardWillShow({
    endCoordinates
  }) {
    setIsKeyboardOpen(true);
    animatedHeight.setValue(endCoordinates.height + MIN_HEIGHT);
  }

  function onKeyboardWillHide({
    duration,
    startCoordinates
  }) {
    // The startCoordinates.height is set to wrong value when we use cmd + k for hide the keyboard (Have no idea why).
    // Because of that the `setIsKeyboardOpened` is not invoked and the state of keyboard is wrong.
    // The keyboardIsOpenBreakpoint use 100 as a fallback if the startCoordinates.height is too small (cmd + k case)
    const keyboardIsOpenBreakpoint = startCoordinates.height > 100 ? startCoordinates.height / 3 : 100;
    const animatedListenerId = animatedHeight.addListener(({
      value
    }) => {
      if (value < keyboardIsOpenBreakpoint) {
        setIsKeyboardOpen(false);
      }
    });
    Animated.timing(animatedHeight, {
      toValue: MIN_HEIGHT,
      duration,
      useNativeDriver: false
    }).start(() => {
      animatedHeight.removeListener(animatedListenerId);
    });
  }

  return createElement(AnimatedKeyboardAvoidingView, _extends({}, otherProps, {
    behavior: "padding",
    keyboardVerticalOffset: keyboardVerticalOffset,
    style: withAnimatedHeight ? [style, {
      height: animatedHeight,
      marginBottom: isKeyboardOpen ? -safeAreaBottomInset : 0
    }] : style
  }), createElement(View, {
    style: [{
      top: -height + MIN_HEIGHT
    }, styles.animatedChildStyle, !withAnimatedHeight && styles.defaultChildStyle]
  }, resizeObserver, otherProps.children));
};
export default KeyboardAvoidingView;
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