@wordpress/components/build-module/mobile/keyboard-aware-flat-list/use-scroll.native.js

UI components for WordPress.

/**
 * External dependencies
 */

import { useWindowDimensions } from 'react-native';
import { useAnimatedScrollHandler, useSharedValue } from 'react-native-reanimated';

/**
 * WordPress dependencies
 */
import { useCallback, useEffect, useRef } from '@wordpress/element';

/**
 * Internal dependencies
 */
import useKeyboardOffset from './use-keyboard-offset';
import useScrollToSection from './use-scroll-to-section';
import useScrollToElement from './use-scroll-to-element';
export default function useScroll({
  scrollEnabled,
  shouldPreventAutomaticScroll,
  onScroll,
  onSizeChange,
  extraScrollHeight
}) {
  const scrollViewRef = useRef();
  const scrollViewMeasurements = useRef();
  const scrollViewYOffset = useSharedValue(-1);
  const lastScrollTo = useRef({
    clientId: null
  });
  const {
    height: windowHeight,
    width: windowWidth
  } = useWindowDimensions();
  const isLandscape = windowWidth >= windowHeight;
  const [keyboardOffset] = useKeyboardOffset(scrollEnabled, shouldPreventAutomaticScroll);
  const scrollHandler = useAnimatedScrollHandler({
    onScroll: event => {
      const {
        contentOffset
      } = event;
      scrollViewYOffset.value = contentOffset.y;
      onScroll(event);
    }
  });

  // When the orientation changes, the ScrollView measurements
  // need to be re-calculated.
  useEffect(() => {
    scrollViewMeasurements.current = null;
  }, [isLandscape]);
  const [scrollToSection] = useScrollToSection(extraScrollHeight, keyboardOffset, scrollEnabled, scrollViewMeasurements, scrollViewRef, scrollViewYOffset);
  const [scrollToElement] = useScrollToElement(scrollViewRef, scrollToSection);
  const measureScrollView = useCallback(() => {
    if (scrollViewRef.current) {
      scrollViewRef.current.measureInWindow((_x, y, width, height) => {
        scrollViewMeasurements.current = {
          y,
          width,
          height
        };
      });
    }
  }, [scrollViewRef]);
  const onContentSizeChange = useCallback(() => {
    if (onSizeChange) {
      onSizeChange();
    }

    // Sets the first values when the content size changes.
    if (!scrollViewMeasurements.current) {
      measureScrollView();
    }
  }, [measureScrollView, onSizeChange]);
  return {
    scrollViewRef,
    scrollHandler,
    keyboardOffset,
    scrollToSection,
    scrollToElement,
    onContentSizeChange,
    lastScrollTo
  };
}
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