@digidem/wcmc-mapeo-mobile-intro/lib/module/IntroPager.js

Intro screens for Mapeo Mobile for the WCMC ICCA registration app

import * as React from 'react';
import { BackHandler, Dimensions, StyleSheet, Platform } from 'react-native';
import { TabView } from 'react-native-tab-view';
import IntroScreen from './IntroScreen';
import { useValues, interpolateColor } from 'react-native-redash';
import Animated from 'react-native-reanimated';
import IntroDots from './IntroDots';
import screens from './screenDefs';
const initialLayout = Dimensions.get('window');

const noop = () => null;

const IntroPager = ({
  onPressComplete = noop,
  onShowInfo = noop
}) => {
  const [index, setIndex] = React.useState(0);
  const routes = React.useMemo(() => {
    return screens.map((_, idx) => ({
      key: idx + '',
      index: idx
    }));
  }, []);
  const [position] = useValues([0], []);
  React.useEffect(() => {
    const subscription = BackHandler.addEventListener('hardwareBackPress', () => {
      setIndex(idx => Math.max(0, idx - 1));
      return true;
    });
    return () => subscription.remove();
  }, []);
  const backgroundColor = Platform.OS === 'web' ? '#ffffff' : interpolateColor(position, {
    inputRange: screens.map((_, i) => i),
    outputRange: screens.map(screen => screen.backgroundColor || '#ffffff')
  });
  const renderScene = React.useCallback(({
    route
  }) => /*#__PURE__*/React.createElement(IntroScreen, {
    key: route.key,
    screen: screens[route.index],
    index: route.index,
    screenCount: routes.length,
    position: position,
    onShowInfo: onShowInfo
  }), [onShowInfo, position, routes.length]);
  const handlePressNext = React.useCallback(() => {
    setIndex(prevIndex => {
      if (prevIndex < routes.length - 1) return prevIndex + 1;
      onPressComplete();
      return prevIndex;
    });
  }, [onPressComplete, routes.length]);
  return (
    /*#__PURE__*/
    // @ts-ignore
    // eslint-disable-next-line react-native/no-inline-styles
    React.createElement(Animated.View, {
      style: {
        backgroundColor,
        flex: 1
      }
    }, /*#__PURE__*/React.createElement(TabView, {
      navigationState: {
        index,
        routes
      },
      renderScene: renderScene,
      onIndexChange: setIndex,
      initialLayout: initialLayout,
      renderTabBar: noop,
      position: position,
      style: styles.overflowVisible,
      sceneContainerStyle: styles.overflowVisible
    }), /*#__PURE__*/React.createElement(IntroDots, {
      position: position,
      jumpTo: setIndex,
      onPressNext: handlePressNext,
      routes: routes
    }))
  );
};

export default /*#__PURE__*/React.memo(IntroPager);
const styles = StyleSheet.create({
  overflowVisible: {
    overflow: 'visible'
  }
});
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