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NavigationAwareCamera.js
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NavigationAwareCamera.js
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import React, {useEffect, useRef} from 'react';
import Webcam from 'react-webcam';
import {useIsFocused} from '@react-navigation/native';
import PropTypes from 'prop-types';
import {View} from 'react-native';
const propTypes = {
/* Flag to turn on/off the torch/flashlight - if available */
torchOn: PropTypes.bool,
/* Callback function when media stream becomes available - user granted camera permissions and camera starts to work */
onUserMedia: PropTypes.func,
/* Callback function passing torch/flashlight capability as bool param of the browser */
onTorchAvailability: PropTypes.func,
};
const defaultProps = {
onUserMedia: undefined,
onTorchAvailability: undefined,
torchOn: false,
};
// Wraps a camera that will only be active when the tab is focused or as soon as it starts to become focused.
const NavigationAwareCamera = React.forwardRef(({torchOn, onTorchAvailability, ...props}, ref) => {
const trackRef = useRef(null);
const isCameraActive = useIsFocused();
const handleOnUserMedia = (stream) => {
if (props.onUserMedia) {
props.onUserMedia(stream);
}
const [track] = stream.getVideoTracks();
const capabilities = track.getCapabilities();
if (capabilities.torch) {
trackRef.current = track;
}
if (onTorchAvailability) {
onTorchAvailability(!!capabilities.torch);
}
};
useEffect(() => {
if (!trackRef.current) {
return;
}
trackRef.current.applyConstraints({
advanced: [{torch: torchOn}],
});
}, [torchOn]);
if (!isCameraActive) {
return null;
}
return (
<View>
<Webcam
audio={false}
screenshotFormat="image/png"
// eslint-disable-next-line react/jsx-props-no-spreading
{...props}
ref={ref}
onUserMedia={handleOnUserMedia}
/>
</View>
);
});
NavigationAwareCamera.propTypes = propTypes;
NavigationAwareCamera.displayName = 'NavigationAwareCamera';
NavigationAwareCamera.defaultProps = defaultProps;
export default NavigationAwareCamera;