App.js

import { StatusBar } from 'expo-status-bar';
import { StyleSheet,  View, Platform } from 'react-native';
import { useState,useRef  } from 'react';
import ImageViewer from './components/ImageViewer';
import Button from './components/Button';
import * as ImagePicker from 'expo-image-picker';
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';
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';



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


export default function App() {
  const [status, requestPermission] = MediaLibrary.usePermissions();
  const [isModalVisible, setIsModalVisible] = useState(false);
  const [selectedImage, setSelectedImage] = useState(null);
  const [showAppOptions, setShowAppOptions] = useState(null);
  const [pickedEmoji, setPickedEmoji] = useState(null);
  const imageRef = useRef();
  const onReset = () => {
    setShowAppOptions(false);
  };
  if (status === null) {
    requestPermission();
  }

  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);
    }
  }
};

  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 did not select any image.');
    }
  };
  return (
    <GestureHandlerRootView style={styles.container}>
      <View style={styles.imageContainer}>
      <View ref={imageRef} collapsable={false}>
        <ImageViewer placeholderImageSource={PlaceholderImage} selectedImage={selectedImage} />
          {pickedEmoji !== null ? <EmojiSticker imageSize={40} stickerSource={pickedEmoji} /> : null}
      </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: '#222222',
    alignItems: 'center',
    justifyContent: 'center',
  },
  footerContainer: {
    flex: 1 / 3,
    alignItems: 'center',
  },
  imageContainer: {
    flex: 1,
    paddingTop: 58,
  },
  image: {
    width: 320,
    height: 440,
    borderRadius: 18,
  },
    optionsContainer: {
      position: 'absolute',
      bottom: 80,
    },
    optionsRow: {
      alignItems: 'center',
      flexDirection: 'row',
    }
  });