How can I design a CustomScrollView with two columns where the first column can be scrolled and the second column can be scrolled and then fixed to the top?

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You can achieve this by using two ScrollViews inside a parent View. The first ScrollView will contain the content for the first column and the second ScrollView will contain the content for the second column.

To make the second column scroll and then fix to the top, you can use the onScroll event of the second ScrollView to get the current scroll position. When the second ScrollView reaches a certain position, you can set the style of the second column View to "position: fixed" and "top: 0". This will fix the second column to the top of the screen while allowing the first column to continue scrolling.

Here is an example code to demonstrate this concept:

import React, { useState } from 'react';
import { View, ScrollView, Text, StyleSheet } from 'react-native';

const CustomScrollView = () => {
  const [scrollPosition, setScrollPosition] = useState(0);

  const handleScroll = (event) => {
    // Get the current scroll position of the second column ScrollView
    const { y } = event.nativeEvent.contentOffset;

    if (y >= 100) {
      // If the scroll position is greater than 100, fix the second column to the top
      setScrollPosition(y);
    } else {
      // Otherwise, reset the position
      setScrollPosition(0);
    }
  };

  return (
    <View style={styles.container}>
      <ScrollView style={styles.firstColumn}>
        {/* Content for the first column */}
        <Text style={styles.text}>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed auctor mauris mauris, at imperdiet augue pulvinar vitae. Pellentesque vulputate sem non pharetra molestie.</Text>
        <Text style={styles.text}>Nulla sapien libero, convallis sed bibendum sit amet, tempus sit amet nunc. In lobortis dolor et ante ultricies, et semper leo lobortis.</Text>
      </ScrollView>
      <View style={[styles.secondColumn, { top: scrollPosition }]}>
        <ScrollView onScroll={handleScroll}>
          {/* Content for the second column */}
          <Text style={styles.text}>Donec blandit eu justo a faucibus. Proin at augue sodales, laoreet lectus vel, vulputate nulla. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas.</Text>
          <Text style={styles.text}>Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia curae; In volutpat ex quis quam maximus facilisis. Sed laoreet ullamcorper purus a bibendum.</Text>
        </ScrollView>
      </View>
    </View>
  );
};

const styles = StyleSheet.create({
  container: {
    flexDirection: 'row',
    flex: 1,
  },
  firstColumn: {
    flex: 1,
    backgroundColor: '#f0f0f0',
  },
  secondColumn: {
    flex: 1,
    position: 'absolute',
    right: 0,
    backgroundColor: '#fafafa',
    borderWidth: 1,
    borderColor: '#ddd',
    padding: 10,
    maxHeight: '100%',
  },
  text: {
    fontSize: 16,
    lineHeight: 24,
    padding: 10,
  },
});

export default CustomScrollView;

In the above code, two ScrollViews have been used. One for the first column and another for the second column. When the second ScrollView is scrolled, the handleScroll function will be called which will check the current scroll position. If the scroll position is greater than or equal to 100, it will set the scrollPosition state to the current scroll position. And if it's less than 100, it will set the scrollPosition state to 0.

The second column View has been given a style of position: absolute which allows it to be positioned on top of the first column ScrollView. When the scrollPosition state is greater than 0, the top style of the second ... (more)