auto flash by default
toggle flash always on
toggle flash always off
scroll to see overflow item
import React, { useState, useEffect } from 'react';
import { Camera } from 'expo-camera';
import * as MediaLibrary from 'expo-media-library';
import { PinchGestureHandler } from 'react-native-gesture-handler';
import { Animated, ScrollView } from 'react-native'
import {
Container, Header, Title, Content, Footer,
FooterTab, Button, Left, Right, Body, Icon, Text,
Accordion, Card, CardItem, Thumbnail, ListItem,
CheckBox, DatePicker, DeckSwiper, Fab, View,
Badge, Form, Item, Input, Label, Picker, Textarea,
Switch, Radio, Spinner, Tab, Tabs, TabHeading,
ScrollableTab, H1, H2, H3, Drawer,
} from 'native-base';
import {
Ionicons, MaterialIcons, Foundation,
MaterialCommunityIcons, Octicons
} from '@expo/vector-icons';
import * as Font from 'expo-font'
export default function App() {
const [loadfont, setloadfont] = useState(true)
const [cameraPermission, setcameraPermission] = useState('denied');
const [storagePermission, setstoragePermission] = useState('denied')
const [cameraDirection, setcameraDirection] = useState(Camera.Constants.Type.back);
const [autoFocus, setautoFocus] = useState('on')
const [whiteBalance, setwhiteBalance] = useState(0)
const [zoomScale, setzoomScale] = useState(0)
const [flash, setflash] = useState(1)
const wbOrder = [
'sunny',
'cloudy',
'shadow',
'fluorescent',
'incandescent',
'auto',
]
const wbIcons = [
'wb-auto',
'wb-sunny',
'wb-cloudy',
'beach-access',
'wb-iridescent',
'wb-incandescent',
]
const flashModeOrder = [
'on',
'auto',
'torch',
'off',
]
const flashIcons = [
'flash-on',
'flash-auto',
'highlight',
'flash-off',
]
useEffect(async () => {
const grantCamera = await Camera.requestPermissionsAsync();
setcameraPermission(grantCamera.status)
const grantStorage = await MediaLibrary.requestPermissionsAsync()
setstoragePermission(grantStorage.status)
await Font.loadAsync({
Roboto: require("native-base/Fonts/Roboto.ttf"),
Roboto_medium: require("native-base/Fonts/Roboto_medium.ttf")
})
setloadfont(false)
}, [])
//bug in software, need to toggle auto focus for some camera to work
timeout = (sec) => { return new Promise(resolve => setTimeout(resolve, sec)) }
takePicture = async () => {
if (this.camera) {
toggleautoFocus()
await timeout(100)
toggleautoFocus()
await timeout(100)
toggleautoFocus()
await timeout(100)
toggleautoFocus()
await timeout(1000)
const { uri } = await this.camera.takePictureAsync();
await MediaLibrary.saveToLibraryAsync(uri)
.then(() => {
alert('image saved!')
})
.catch(error => {
alert('An Error Occurred!')
});
}
}
togglewhiteBalance = () => {
whiteBalance < 5 ? setwhiteBalance(whiteBalance + 1) : setwhiteBalance(0)
}
toggleautoFocus = () => {
autoFocus === 'on' ? setautoFocus('off') : setautoFocus('on')
}
toggleCamera = () => {
cameraDirection === Camera.Constants.Type.back ?
setcameraDirection(Camera.Constants.Type.front) :
setcameraDirection(Camera.Constants.Type.back)
}
toggleFlash = () => {
flash < 3 ? setflash(flash + 1) : setflash(0)
}
onZoomEvent = Animated.event(
[
{
nativeEvent: { scale: new Animated.Value(1) }
}
],
{
useNativeDriver: true
}
)
onZoomStateChange = event => {
const e = event.nativeEvent
if (e.oldState === 4) {
//camera zoom: 0 = no zoom, 1 = max zoom
if (e.scale < 1) {
setzoomScale(zoomScale + e.scale - 1 < 0 ? 0 : zoomScale + e.scale - 1)
}
else {
setzoomScale(zoomScale + e.scale / 5.0 > 1 ? 1 : zoomScale + e.scale / 5.0)
}
}
}
if (cameraPermission !== 'granted' || storagePermission !== 'granted') {
return <Text style={{ marginTop: 25 }}>App uses camera and storage</Text>;
}
if (loadfont) {
return <Container style={{ backgroundColor: 'black' }}><Spinner /></Container>
}
return (
<PinchGestureHandler
onGestureEvent={() => onZoomEvent}
onHandlerStateChange={(e) => onZoomStateChange(e)}>
<View style={{ flex: 1, backgroundColor: 'transparent' }}>
<Camera style={{ flex: 1 }}
type={cameraDirection}
autoFocus={autoFocus}
whiteBalance={wbOrder[whiteBalance]}
focusDepth={1}
zoom={zoomScale}
flashMode={flashModeOrder[flash]}
ref={ref => { this.camera = ref }}>
<View style={{
flex: 1,
justifyContent: 'space-between',
}}>
<View style={{ flex: 0.12, backgroundColor: 'transparent' }}>
<ScrollView horizontal={true}
style={{
marginTop: 25,
backgroundColor: 'transparent',
}} >
<Button rounded transparent style={{ height: 50, marginLeft: 40, marginRight: 20 }}
onPress={() => toggleCamera()}>
<Ionicons name="ios-reverse-camera" size={40} color="white" />
</Button>
<Button rounded transparent style={{ height: 50, marginHorizontal: 40 }}
onPress={() => toggleFlash()}>
<MaterialIcons name={flashIcons[flash]} size={40} color="white" />
</Button>
<Button rounded transparent style={{ height: 50, marginHorizontal: 20 }}
onPress={() => togglewhiteBalance()}>
<MaterialIcons name={wbIcons[whiteBalance]} size={40} color="white" />
</Button>
<Button rounded transparent style={{ height: 50, marginHorizontal: 20 }}
onPress={() => alert('double finger gesture\nstretch => zoom in\nsqueeze => zoom out')}>
<Text style={{ color: 'white', fontSize: 25 }}>x{(1 + 4 * zoomScale).toFixed(1)}</Text>
</Button>
<Button rounded transparent style={{ height: 50, marginHorizontal: 20 }}
onPress={() => toggleautoFocus()}>
<Text style={{ color: autoFocus === 'on' ? "white" : "#6b6b6b", fontSize: 25 }}>AF</Text>
</Button>
</ScrollView>
</View>
<View style={{
flex: 0.12,
backgroundColor: 'transparent',
justifyContent: 'center',
flexDirection: 'row',
marginBottom: 25,
}}>
<Button rounded transparent style={{ height: 80 }}
onPress={() => { takePicture() }}>
<Icon name='camera' style={{ fontSize: 60, color: 'white' }} ></Icon>
</Button>
</View>
</View>
</Camera>
</View>
</PinchGestureHandler>
);
}
reference:
https://stackoverflow.com/questions/45591039/how-to-make-scrollview-horizontal-in-react-native
https://stackoverflow.com/questions/49373417/react-native-scrollview-height-always-stays-static-and-does-not-change
looping scroll
https://www.npmjs.com/package/react-native-infinite-looping-scroll
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