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Merge pull request #1834 from coopcycle/feature/barcode
Barcode scanner
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,144 @@ | ||
| import React, { useState, forwardRef } from 'react'; | ||
| import { Dimensions, Text } from 'react-native'; | ||
| import { View, Vibration } from 'react-native'; | ||
| import { CameraView, useCameraPermissions } from 'expo-camera/next'; | ||
| import _ from 'lodash'; | ||
| import { Icon } from 'native-base'; | ||
| import Ionicons from 'react-native-vector-icons/Ionicons'; | ||
| import { TouchableOpacity } from 'react-native-gesture-handler'; | ||
| import FocusHandler from './FocusHandler'; | ||
|
|
||
| function getBoxBoundaries(points) { | ||
| const xs = points.map(point => point.x); | ||
| const ys = points.map(point => point.y); | ||
| const minX = Math.min(...xs); | ||
| const maxX = Math.max(...xs); | ||
| const minY = Math.min(...ys); | ||
| const maxY = Math.max(...ys); | ||
| return { minX, maxX, minY, maxY }; | ||
| } | ||
|
|
||
| function horizontalLineIntersectsBox(lineY, lineStartX, lineEndX, points) { | ||
| const { minX, maxX, minY, maxY } = getBoxBoundaries(points); | ||
|
|
||
| if (lineY < minY || lineY > maxY) { | ||
| return false; | ||
| } | ||
| if (lineStartX > lineEndX) { | ||
| [lineStartX, lineEndX] = [lineEndX, lineStartX]; | ||
| } | ||
| return lineEndX >= minX && lineStartX <= maxX; | ||
| } | ||
|
|
||
| function BarcodeCameraView({ disabled, ...props }, ref) { | ||
| const [hasPermission, requestPermission] = useCameraPermissions(); | ||
|
|
||
| const { width: CameraWidth } = Dimensions.get('window'); | ||
| const CameraHeight = CameraWidth * 0.55; | ||
| const PaddingHorizontal = CameraWidth * 0.1618; | ||
|
|
||
| const [barcode, setBarcode] = useState(null); | ||
| const [flash, setFlash] = useState(false); | ||
|
|
||
| //The hide behavior is a hack to force the camera to re-render | ||
| //if another camera is opened on modal. If we don't do this, the | ||
| //camera will not render. | ||
| const [hide, setHide] = useState(disabled ?? false); | ||
|
|
||
| if (!hasPermission) { | ||
| return ( | ||
| <View> | ||
| <Text>No camera permission</Text> | ||
| </View> | ||
| ); | ||
| } | ||
|
|
||
| if (!hasPermission.granted) { | ||
| requestPermission(); | ||
| return <View />; | ||
| } | ||
|
|
||
| const onScanned = _.throttle(result => { | ||
| const { data, cornerPoints } = result; | ||
| if ( | ||
| !horizontalLineIntersectsBox( | ||
| CameraHeight / 2, | ||
| PaddingHorizontal, | ||
| CameraWidth - PaddingHorizontal, | ||
| cornerPoints, | ||
| ) | ||
| ) { | ||
| return; | ||
| } | ||
|
|
||
| if (data !== barcode) { | ||
| Vibration.vibrate(); | ||
| setBarcode(data); | ||
| props.onScanned(data); | ||
| } | ||
| }, 200); | ||
|
|
||
| return ( | ||
| <> | ||
| <FocusHandler | ||
| onFocus={() => { | ||
| if (!disabled) { | ||
| setHide(false); | ||
| } | ||
| }} | ||
| onBlur={() => { | ||
| setHide(true); | ||
| }} | ||
| /> | ||
| {!hide && ( | ||
| <CameraView | ||
| ref={ref} | ||
| enableTorch={flash} | ||
| style={{ | ||
| height: CameraHeight, | ||
| width: CameraWidth, | ||
| position: 'relative', | ||
| }} | ||
| onBarcodeScanned={onScanned} | ||
| barcodeScannerSettings={{ | ||
| barcodeTypes: ['code128'], | ||
| }}> | ||
| <View | ||
| style={{ | ||
| position: 'absolute', | ||
| borderColor: 'rgba(255, 0, 0, 0.6)', | ||
| borderBottomWidth: 1, | ||
| top: CameraHeight / 2, | ||
| left: PaddingHorizontal, | ||
| right: PaddingHorizontal, | ||
| }} | ||
| /> | ||
| <View | ||
| style={{ | ||
| position: 'absolute', | ||
| top: 10, | ||
| right: 10, | ||
| }}> | ||
| <TouchableOpacity onPress={() => setFlash(!flash)}> | ||
| <Icon | ||
| as={Ionicons} | ||
| name={flash ? 'flash-sharp' : 'flash-off-sharp'} | ||
| style={{ color: 'rgba(255, 255, 255, 0.6)' }} | ||
| /> | ||
| </TouchableOpacity> | ||
| </View> | ||
| </CameraView> | ||
| )} | ||
| {hide && ( | ||
| <View | ||
| style={{ | ||
| height: CameraHeight, | ||
| width: CameraWidth, | ||
| backgroundColor: 'black', | ||
| }}></View> | ||
| )} | ||
| </> | ||
| ); | ||
| } | ||
|
|
||
| export default forwardRef(BarcodeCameraView); |
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