App.js

import { StatusBar } from 'expo-status-bar';
import { StyleSheet, Text, View, Image, Platform } from 'react-native';
import * as ImagePicker from 'expo-image-picker';
import { useState, useRef } from 'react';
import { GestureHandlerRootView } from 'react-native-gesture-handler';
import * as MediaLibrary from 'expo-media-library'
import { captureRef } from 'react-native-view-shot';
import domtoimage from 'dom-to-image';



import ImageViewer from './components/imageViewer';
import Button from './components/Button';
import CircleButton from './components/CircleButton';
import IconButton from './components/IconButton';
import EmojiPicker from './components/EmojiPicker';
import EmojiList from './components/EmojiList';
import EmojiSticker from './components/EmojiSticker';

const PlaceholderImage = require('./assets/images/background-image.png')

export default function App() {

  const [selectedImage, setSelectedImage] = useState(null)
  const [showAppOptions, setShowAppOptions] = useState(false)
  const [isModalVisible, setIsModalVisible] = useState(false)
  const [pickedEmoji, setPickedEmoji] = useState(null)
  const [status, requestPermission] = MediaLibrary.usePermissions()
  const imageRef = useRef()

  const pickImageAsync = async () => {
    let result = await ImagePicker.launchImageLibraryAsync({
      allowsEditing: true,
      quality: 1,
    });

    if (!result.canceled) {
      setSelectedImage(result.assets[0].uri);
      setShowAppOptions(true)
    } else {
      alert("You didnot select any image.")
    }
  }

  const onReset = () => {
    setShowAppOptions(false)
  }

  const onAddSticker = () => {
    setIsModalVisible(true)
  }

  const onModalClose = () => {
    setIsModalVisible(false)
  }
  const onSaveImageAsync = async () => {
    if (Platform.OS !== 'web') {
      try {
        const localUri = await captureRef(imageRef, {
          height: 440,
          quality: 1
        })

        await MediaLibrary.saveToLibraryAsync(localUri)

        if (localUri) {
          alert("saved");
        }
      } catch (e) {
        console.log(e);
      }
    } else {
      try {
        const dataUrl = await domtoimage.toJpeg(imageRef.current, {
          quality: 0.95,
          width: 320,
          height: 440,
        });

        let link = document.createElement('a');
        link.download = 'sticker-smash.jpeg';
        link.href = dataUrl;
        link.click();
      } catch (e) {
        console.log(e);
      }
    }

  }

  if (status === null) {
    requestPermission();
  }

  return (
    <GestureHandlerRootView style={styles.container}>
      <View style={styles.imageContainer}>
        <View ref={imageRef} collapsable={false}>
          <ImageViewer
            placeholderImageSource={PlaceholderImage}
            selectedImage={selectedImage} />
          {pickedEmoji && <EmojiSticker imageSize={40} stickerSource={pickedEmoji} />}

        </View>

      </View>

      {showAppOptions ? (
        <View style={styles.optionsContainer}>
          <View style={styles.optionsRow}>
            <IconButton icon="refresh" label="Reset" onPress={onReset} />
            <CircleButton onPress={onAddSticker} />
            <IconButton icon="save-alt" label="save" onPress={onSaveImageAsync} />
          </View>
        </View>
      ) : (
        <View style={styles.footerContainer}>
          <Button label="Choose a photo" theme="primary" onPress={pickImageAsync} />
          <Button label="use this photo" onPress={() => setShowAppOptions(true)} />
        </View>
      )}

      <EmojiPicker isVisible={isModalVisible} onClose={onModalClose}>
        <EmojiList onSelect={setPickedEmoji} onCloseModal={onModalClose} />
      </EmojiPicker>

      <StatusBar style="auto" />
    </GestureHandlerRootView>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#25292e',
    alignItems: 'center',
    justifyContent: 'center',
  },
  imageContainer: {
    flex: 1,
    paddingTop: 58,
  },
  image: {
    width: 320,
    height: 440,
    borderRadius: 18,
  },
  footerContainer: {
    flex: 1 / 3,
    alignItems: 'center',
  },
  // for 3 additional buttons
  optionsContainer: {
    position: 'absolute',
    bottom: 80,
  },
  optionsRow: {
    alignItems: 'center',
    flexDirection: 'row',
  },
});