Mobile: Camera screen: Support scanning QR codes (#11245)

packages/app-mobile/components/CameraView/utils/useBarcodeScanner.ts

@@ -0,0 +1,42 @@
+import { useMemo, useState } from 'react';
+
+
+interface ScannedData {
+	text: string;
+	timestamp: number;
+}
+
+interface BarcodeScanningResult {
+	type: string;
+	data: string;
+}
+
+export interface BarcodeScanner {
+	enabled: boolean;
+	onToggleEnabled: ()=> void;
+	onBarcodeScanned: (scan: BarcodeScanningResult)=> void;
+	lastScan: ScannedData|null;
+}
+
+
+const useBarcodeScanner = (): BarcodeScanner => {
+	const [lastScan, setLastScan] = useState<ScannedData|null>(null);
+	const [enabled, setEnabled] = useState(true);
+	return useMemo(() => {
+		return {
+			enabled,
+			onToggleEnabled: () => {
+				setEnabled(enabled => !enabled);
+			},
+			onBarcodeScanned: enabled ? (scanningResult: BarcodeScanningResult) => {
+				setLastScan({
+					text: scanningResult.data ?? 'null',
+					timestamp: performance.now(),
+				});
+			} : null,
+			lastScan,
+		};
+	}, [lastScan, enabled]);
+};
+
+export default useBarcodeScanner;