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

import Compa from './components/compa';
import Compb from './components/compb';
import Compc from './components/compc';

export default function App() {
  const [selectedTab, setSelectedTab] = useState();
 
  let setTab = (tab) => {
    setSelectedTab(tab);
  }
  let selectTab = () => {
     switch(selectedTab) {
      case 'A':
        return <Compa />
      case 'B':
        return <Compb />
      case 'C':
        return <Compc />
      default:
        return
    }
  }  

  return (
    <View style={styles.container}>
        <View style={styles.buttonBox}>
          <Button onPress={() => setTab('A')} title='A' />
          <Button onPress={() => setTab('B')} title='B' 
            color='blue'
          />
          <Button onPress={() => setTab('C')} title='C' />
          <View style={styles.component}>
            {selectTab()}
          </View> 
        </View>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: 'skyblue',
    alignItems: 'center',
    justifyContent: 'center',
  },
  buttonBox: {
    flex: 1,
    width: '100%',
  },
  component: {
    flex: 1,
  }  
});