import { View, Text, ScrollView } from 'react-native';
import {
  wrapScrollView,
  useScrollIntoView,
} from 'react-native-scroll-into-view';

const CustomScrollView = wrapScrollView(ScrollView);

function MyScreen() {
  return (
    <CustomScrollView>
      <MyScreenContent />
    </CustomScrollView>
  );
}

function MyScreenContent() {
  const scrollIntoView = useScrollIntoView();
  const viewRef = useRef();
  return (
    <>
      <Button onPress={() => scrollIntoView(viewRef.current)}>
        Scroll a view ref into view
      </Button>
      // in android if the scroll is not working then add renderToHardwareTextureAndroid this to view
      <View style={{ height: 100000 }}>
        <Text>Some long ScrollView content</Text>
      </View>

      <View ref={viewRef}>
        <Text>Will be scrolled into view on button press</Text>
      </View>
    </>
  );
}

import {
  ScrollIntoView, // enhanced View container
  wrapScrollView, // simple wrapper, no config
  wrapScrollViewConfigured, // complex wrapper, takes a config
  useScrollIntoView, // access hook for imperative usage
} from 'react-native-scroll-into-view';

// Available options with their default value
const options = {
  // auto: ensure element appears fully inside the view (if not already inside). It may align to top or bottom.
  // top: align element to top
  // bottom: align element to bottom
  // center: align element at the center of the view
  align: 'auto',

  // Animate the scrollIntoView() operation
  animated: true,

  // By default, scrollIntoView() calls are throttled a bit because it does not make much sense
  // to scrollIntoView() 2 elements at the same time (and sometimes even impossible)
  immediate: false,

  // Permit to add top/bottom insets so that element scrolled into view
  // is not touching directly the borders of the scrollview (like a padding)
  insets: {
    top: 0,
    bottom: 0,
  },

  // Advanced: use these options as escape hatches if the lib default functions do not satisfy your needs
  computeScrollY: (scrollViewLayout, viewLayout, scrollY, insets, align) => {},
  measureElement: viewRef => {},
};

// Wrap the original ScrollView
const CustomScrollView = wrapScrollView(ScrollView);

// Use the wrapped CustomScrollView as a replacement of ScrollView
function MyScreen() {
  return (
    <CustomScrollView
      // Can provide default options (overrideable)
      scrollIntoViewOptions={scrollIntoViewOptions}
    >
      <ScreenContent />
    </CustomScrollView>
  );
}

// Implement ScreenContent (inner of the ScrollView) with the useScrollIntoView and refs
function ScreenContent() {
  const scrollIntoView = useScrollIntoView();
  const viewRef = useRef();

  return (
    <>
      <Button
        onPress={() => {
          scrollIntoView(viewRef.current, options);
        }}
      >
        Scroll a view ref into view
      </Button>

      <View style={{ height: 100000 }}>
        <Text>Some long ScrollView content</Text>
      </View>

      <View ref={viewRef}>
        <Text>Will be scrolled into view on button press</Text>
      </View>
    </>
  );
}

// Or implement ScreenContent (inner of the ScrollView) with class + declarative ScrollIntoView component
class ScreenContent extends React.Component {
  render() {
    return (
      <>
        <ScrollIntoView>
          <Text>This will scroll into view on mount</Text>
        </ScrollIntoView>

        <ScrollIntoView align="center">
          <Text>This will scroll into view on mount and will be centered</Text>
        </ScrollIntoView>

        <ScrollIntoView animated={false}>
          <Text>This will scroll into view on mount without any animation</Text>
        </ScrollIntoView>

        <ScrollIntoView immediate={true}>
          <Text>
            This will not throttle scrollIntoView calls, as by default it does
            not make much sense to scroll into view multiple elements at the
            same time...
          </Text>
        </ScrollIntoView>

        <ScrollIntoView enabled={false}>
          <Text>This will scroll into view whenever enabled becomes true</Text>
        </ScrollIntoView>

        <ScrollIntoView scrollIntoViewKey="some string">
          <Text>
            This will scroll into view whenever scrollIntoViewKey changes
          </Text>
        </ScrollIntoView>

        <ScrollIntoView
          onMount={false}
          onUpdate={true}
          scrollIntoViewKey="some string"
        >
          <Text>
            This will scroll into on update (if it becomes enabled, or key
            changes)
          </Text>
        </ScrollIntoView>

        <ScrollIntoView scrollIntoViewOptions={options}>
          <Text>
            This will scroll into view on mount with custom option props
          </Text>
        </ScrollIntoView>

        <View>
          <ScrollIntoView
            enabled={false}
            ref={ref => (this.scrollIntoViewRef = ref)}
          >
            <Text>This will scroll into view when the button is pressed</Text>
          </ScrollIntoView>
          <Button
            title="Make above text scroll into view with custom options"
            onPress={() =>
              this.scrollIntoViewRef.scrollIntoView(scrollIntoViewOptions)
            }
          />
        </View>
      </>
    );
  }
}

const CustomScrollView = wrapScrollViewConfigured({
  // SIMPLE CONFIG:
  // ScrollIntoView default/fallback options
  options: scrollIntoViewOptions,

  // ADVANCED CONFIG:
  // Use this if you use a ScrollView wrapper that does not use React.forwardRef()
  refPropName: 'ref',
  // unwraps the ref that the wrapped ScrollView gives you (this lib need the bare metal ScrollView ref)
  getScrollViewNode: ref => ref,
  // fallback value for throttling, can be overriden by user with props
  scrollEventThrottle: 16,
})(ScrollView);