Merge branch 'main' into next

packages/core/client-v2/src/components/form/ScanInput/CodeScanner.tsx

@@ -11,7 +11,7 @@ import { FileImageOutlined, LeftOutlined } from '@ant-design/icons';
 import { css } from '@emotion/css';
 import { Button, message, theme } from 'antd';
 import { Html5Qrcode } from 'html5-qrcode';
-import React, { useCallback, useEffect, useId, useMemo, useRef, useState } from 'react';
+import React, { useCallback, useEffect, useId, useRef, useState } from 'react';
 import ReactDOM from 'react-dom';
 import { useTranslation } from 'react-i18next';
 import { ScanBox } from './ScanBox';
@@ -26,6 +26,14 @@ type CodeScannerProps = {
 };
 
 const MAX_CODE_IMAGE_SIZE = 10 * 1024 * 1024;
+const SCANNER_RENDER_WIDTH = 1280;
+
+function getViewportSize() {
+  return {
+    width: Math.max(document.documentElement.clientWidth || 0, window.innerWidth || 0),
+    height: Math.max(document.documentElement.clientHeight || 0, window.innerHeight || 0),
+  };
+}
 
 function CodeScannerContent({ visible, formatsToSupport, onClose, onScanSuccess }: CodeScannerProps) {
   const { t } = useTranslation();
@@ -34,16 +42,15 @@ function CodeScannerContent({ visible, formatsToSupport, onClose, onScanSuccess
   const scannerElementId = `code-scanner-${inputId}`;
   const imgUploaderRef = useRef<HTMLInputElement>(null);
   const [cameraAvailable, setCameraAvailable] = useState(false);
+  const [scannerSize, setScannerSize] = useState({ width: 0, height: 0 });
+  const [viewport, setViewport] = useState(getViewportSize);
 
-  const viewport = useMemo(() => {
-    const width = Math.max(document.documentElement.clientWidth || 0, window.innerWidth || 0);
-    const height = Math.max(document.documentElement.clientHeight || 0, window.innerHeight || 0);
-    return { width, height };
-  }, []);
-  const scanBoxSize = useMemo(
-    () => getCodeScanBoxSize(viewport.width, viewport.height),
-    [viewport.height, viewport.width],
-  );
+  const previewScale = scannerSize.width
+    ? Math.max(viewport.width / scannerSize.width, viewport.height / scannerSize.height)
+    : Math.min(1, viewport.width / SCANNER_RENDER_WIDTH);
+  const visibleScanBoxSize = scannerSize.width
+    ? getCodeScanBoxSize(viewport.width, viewport.height)
+    : { width: 0, height: 0 };
 
   const showScanFailure = useCallback(() => {
     message.error(t('Code recognition failed, please scan again'));
@@ -76,12 +83,18 @@ function CodeScannerContent({ visible, formatsToSupport, onClose, onScanSuccess
     enabled: visible && cameraAvailable,
     elementId: scannerElementId,
     formatsToSupport,
-    scanBoxSize,
+    onScannerSizeChanged: setScannerSize,
     onScanSuccess: handleScanSuccess,
     onScanFailure: showScanFailure,
     onCameraStartFailure: showCameraStartFailure,
   });
 
+  useEffect(() => {
+    const handleResize = () => setViewport(getViewportSize());
+    window.addEventListener('resize', handleResize);
+    return () => window.removeEventListener('resize', handleResize);
+  }, []);
+
   useEffect(() => {
     if (!visible) {
       return;
@@ -152,18 +165,22 @@ function CodeScannerContent({ visible, formatsToSupport, onClose, onScanSuccess
     inset: 0;
     overflow: hidden;
   `;
+  const scannerSurfaceClass = css`
+    position: absolute;
+    top: 50%;
+    left: 50%;
+    transform-origin: center;
+  `;
   const scannerClass = css`
     position: relative;
     width: 100%;
-    height: 100%;
-    overflow: hidden;
+    line-height: 0;
 
     video {
-      position: absolute !important;
-      inset: 0 !important;
       width: 100% !important;
-      height: 100% !important;
-      object-fit: cover !important;
+      height: auto !important;
+      max-width: none !important;
+      display: block !important;
     }
 
     #qr-shaded-region {
@@ -191,26 +208,36 @@ function CodeScannerContent({ visible, formatsToSupport, onClose, onScanSuccess
   return (
     <div className={rootClass}>
       <div className={scannerWrapperClass}>
-        <div id={scannerElementId} className={scannerClass} />
+        <div
+          className={scannerSurfaceClass}
+          style={{
+            width: `${SCANNER_RENDER_WIDTH}px`,
+            transform: `translate(-50%, -50%) scale(${previewScale})`,
+          }}
+        >
+          <div id={scannerElementId} className={scannerClass} />
+        </div>
       </div>
+      {cameraAvailable && scannerSize.width > 0 && (
+        <ScanBox
+          style={{
+            position: 'fixed',
+            top: `${(viewport.height - visibleScanBoxSize.height) / 2}px`,
+            left: `${(viewport.width - visibleScanBoxSize.width) / 2}px`,
+            width: `${visibleScanBoxSize.width}px`,
+            height: `${visibleScanBoxSize.height}px`,
+          }}
+        />
+      )}
+      <Button
+        aria-label={t('Close')}
+        className={closeButtonClass}
+        icon={<LeftOutlined />}
+        type="text"
+        onClick={onClose}
+      />
       {cameraAvailable && (
         <>
-          <ScanBox
-            style={{
-              position: 'fixed',
-              top: `${(viewport.height - scanBoxSize.height) / 2}px`,
-              left: `${(viewport.width - scanBoxSize.width) / 2}px`,
-              width: `${scanBoxSize.width}px`,
-              height: `${scanBoxSize.height}px`,
-            }}
-          />
-          <Button
-            aria-label={t('Close')}
-            className={closeButtonClass}
-            icon={<LeftOutlined />}
-            type="text"
-            onClick={onClose}
-          />
           <Button className={albumClass} icon={<FileImageOutlined />} type="text" onClick={handleImageButtonClick}>
             {t('Album')}
           </Button>

packages/core/client-v2/src/components/form/ScanInput/__tests__/CodeScanner.test.tsx

@@ -0,0 +1,101 @@
+/**
+ * This file is part of the NocoBase (R) project.
+ * Copyright (c) 2020-2024 NocoBase Co., Ltd.
+ * Authors: NocoBase Team.
+ *
+ * This project is dual-licensed under AGPL-3.0 and NocoBase Commercial License.
+ * For more information, please refer to: https://www.nocobase.com/agreement.
+ */
+
+import { act, render, waitFor } from '@testing-library/react';
+import React from 'react';
+import { afterEach, describe, expect, it, vi } from 'vitest';
+import { CodeScanner } from '../CodeScanner';
+
+const mocks = vi.hoisted(() => ({
+  getCameras: vi.fn().mockResolvedValue([{ id: 'rear-camera' }]),
+}));
+
+vi.mock('html5-qrcode', () => ({
+  Html5Qrcode: {
+    getCameras: mocks.getCameras,
+  },
+  Html5QrcodeScannerState: {
+    PAUSED: 3,
+    SCANNING: 2,
+  },
+  Html5QrcodeSupportedFormats: {
+    CODABAR: 2,
+    CODE_128: 5,
+    CODE_39: 3,
+    CODE_93: 4,
+    DATA_MATRIX: 6,
+    EAN_13: 9,
+    EAN_8: 10,
+    ITF: 8,
+    PDF_417: 11,
+    QR_CODE: 0,
+    UPC_A: 14,
+    UPC_E: 15,
+  },
+}));
+
+vi.mock('react-i18next', () => ({
+  useTranslation: () => ({ t: (key: string) => key }),
+}));
+
+vi.mock('../useCodeScanner', async (importOriginal) => {
+  const actual = await importOriginal<typeof import('../useCodeScanner')>();
+  const ReactModule = await import('react');
+
+  return {
+    ...actual,
+    useCodeScanner: ({
+      enabled,
+      onScannerSizeChanged,
+    }: {
+      enabled: boolean;
+      onScannerSizeChanged?: (size: { width: number; height: number }) => void;
+    }) => {
+      ReactModule.useEffect(() => {
+        if (enabled) {
+          onScannerSizeChanged?.({ width: 1280, height: 720 });
+        }
+      }, [enabled, onScannerSizeChanged]);
+
+      return { startScanFile: vi.fn() };
+    },
+  };
+});
+
+describe('CodeScanner', () => {
+  afterEach(() => {
+    vi.restoreAllMocks();
+  });
+
+  it('keeps the camera preview covering portrait and landscape viewports', async () => {
+    let viewportWidth = 390;
+    let viewportHeight = 844;
+    vi.spyOn(window, 'innerWidth', 'get').mockImplementation(() => viewportWidth);
+    vi.spyOn(window, 'innerHeight', 'get').mockImplementation(() => viewportHeight);
+
+    render(<CodeScanner visible onClose={() => undefined} onScanSuccess={() => undefined} />);
+
+    await waitFor(() => expect(document.getElementById('code-scan-box')).toBeInTheDocument());
+
+    const scannerElement = document.querySelector<HTMLElement>('[id^="code-scanner-"]');
+    const scannerSurface = scannerElement?.parentElement;
+    const scanBox = document.getElementById('code-scan-box');
+    expect(scannerSurface?.style.transform).toBe(`translate(-50%, -50%) scale(${844 / 720})`);
+    expect(scanBox).toHaveStyle({ width: '351px', height: '540px' });
+
+    viewportWidth = 844;
+    viewportHeight = 390;
+    act(() => window.dispatchEvent(new Event('resize')));
+
+    await waitFor(() => {
+      expect(scannerSurface?.style.transform).toBe(`translate(-50%, -50%) scale(${844 / 1280})`);
+      expect(scanBox).toHaveStyle({ width: '759px', height: '273px' });
+    });
+  });
+});

packages/core/client-v2/src/components/form/ScanInput/__tests__/useCodeScanner.test.tsx

@@ -7,13 +7,15 @@
  * For more information, please refer to: https://www.nocobase.com/agreement.
  */
 
-import { fireEvent, render, screen, waitFor } from '@testing-library/react';
+import { act, fireEvent, render, screen, waitFor } from '@testing-library/react';
 import React, { useCallback } from 'react';
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
-import { DEFAULT_CODE_FORMATS, getCodeScanBoxSize, useCodeScanner } from '../useCodeScanner';
+import { DEFAULT_CODE_FORMATS, getCodeScanBoxSize, scanQrVideoFrame, useCodeScanner } from '../useCodeScanner';
 
 type MockScannerInstance = {
+  applyVideoConstraints: ReturnType<typeof vi.fn>;
   clear: ReturnType<typeof vi.fn>;
+  getRunningTrackCapabilities: ReturnType<typeof vi.fn>;
   getState: ReturnType<typeof vi.fn>;
   scanFileV2: ReturnType<typeof vi.fn>;
   start: ReturnType<typeof vi.fn>;
@@ -24,18 +26,24 @@ const mocks = vi.hoisted(() => {
   const start = vi.fn().mockResolvedValue(null);
   const stop = vi.fn().mockResolvedValue(null);
   const clear = vi.fn();
+  const applyVideoConstraints = vi.fn().mockResolvedValue(undefined);
+  const getRunningTrackCapabilities = vi.fn(() => ({}));
   const getState = vi.fn(() => 1);
   const scanFileV2 = vi.fn();
   const Html5Qrcode = vi.fn(function MockHtml5Qrcode(this: MockScannerInstance) {
     this.start = start;
     this.stop = stop;
     this.clear = clear;
+    this.applyVideoConstraints = applyVideoConstraints;
+    this.getRunningTrackCapabilities = getRunningTrackCapabilities;
     this.getState = getState;
     this.scanFileV2 = scanFileV2;
   });
 
   return {
+    applyVideoConstraints,
     clear,
+    getRunningTrackCapabilities,
     getState,
     Html5Qrcode,
     scanFileV2,
@@ -77,18 +85,15 @@ vi.mock('jsqr', () => jsQrMocks);
 function ScannerHost({
   onCameraStartFailure,
   onScanFailure,
-  scanBoxSize,
 }: {
   onCameraStartFailure?: (error: unknown) => void;
   onScanFailure?: () => void;
-  scanBoxSize?: { width: number; height: number };
 } = {}) {
   const handleScanSuccess = useCallback(() => undefined, []);
 
   useCodeScanner({
     elementId: 'scanner',
     enabled: true,
-    scanBoxSize,
     onCameraStartFailure,
     onScanFailure,
     onScanSuccess: handleScanSuccess,
@@ -159,6 +164,11 @@ function stubCanvas() {
 describe('useCodeScanner', () => {
   beforeEach(() => {
     vi.clearAllMocks();
+    mocks.applyVideoConstraints.mockResolvedValue(undefined);
+    mocks.getRunningTrackCapabilities.mockReturnValue({});
+    mocks.start.mockResolvedValue(null);
+    mocks.stop.mockResolvedValue(null);
+    mocks.getState.mockReturnValue(1);
     jsQrMocks.default.mockReturnValue(undefined);
   });
 
@@ -188,32 +198,73 @@ describe('useCodeScanner', () => {
       | { qrbox?: (width: number, height: number) => { width: number; height: number } }
       | undefined;
 
-    expect(config?.qrbox?.(390, 844)).toEqual({ width: 319, height: 240 });
-    expect(getCodeScanBoxSize(390, 844)).toEqual({ width: 319, height: 240 });
+    expect(config?.qrbox?.(1280, 720)).toEqual({ width: 1152, height: 504 });
+    expect(getCodeScanBoxSize(1280, 720)).toEqual({ width: 1152, height: 504 });
   });
 
-  it('can use the visible viewport scan box when the camera video is wider than the viewport', async () => {
-    render(<ScannerHost scanBoxSize={{ width: 319, height: 240 }} />);
+  it('uses optimized camera constraints without requiring a user-selected scan mode', async () => {
+    render(<ScannerHost />);
 
     await waitFor(() => expect(mocks.start).toHaveBeenCalled());
 
     const config = mocks.start.mock.calls[0]?.[1] as
-      | { qrbox?: (width: number, height: number) => { width: number; height: number } }
+      | {
+          disableFlip?: boolean;
+          fps?: number;
+          qrbox?: (width: number, height: number) => { width: number; height: number };
+          videoConstraints?: MediaTrackConstraints;
+        }
       | undefined;
 
-    expect(config?.qrbox?.(1200, 844)).toEqual({ width: 319, height: 240 });
+    expect(config?.qrbox?.(1280, 720)).toEqual({ width: 1152, height: 504 });
+    expect(config).toMatchObject({
+      disableFlip: false,
+      fps: 8,
+      videoConstraints: {
+        facingMode: { ideal: 'environment' },
+        width: { ideal: 1920 },
+        height: { ideal: 1080 },
+        frameRate: { ideal: 30 },
+      },
+    });
+    expect(mocks.Html5Qrcode).toHaveBeenCalledWith('scanner', {
+      formatsToSupport: DEFAULT_CODE_FORMATS,
+      verbose: false,
+    });
   });
 
-  it('clamps the scan box to the camera viewfinder size', async () => {
-    render(<ScannerHost scanBoxSize={{ width: 319, height: 240 }} />);
+  it('decodes a centered QR code from the raw camera frame fast path', () => {
+    jsQrMocks.default.mockReturnValueOnce({ data: 'FAST-QR' });
+    stubCanvas();
+    const video = document.createElement('video');
+    Object.defineProperties(video, {
+      clientHeight: { value: 720 },
+      clientWidth: { value: 1280 },
+      readyState: { value: HTMLMediaElement.HAVE_CURRENT_DATA },
+      videoHeight: { value: 1080 },
+      videoWidth: { value: 1920 },
+    });
+    const canvas = document.createElement('canvas');
 
-    await waitFor(() => expect(mocks.start).toHaveBeenCalled());
+    expect(scanQrVideoFrame(video, canvas)).toBe('FAST-QR');
 
-    const config = mocks.start.mock.calls[0]?.[1] as
-      | { qrbox?: (width: number, height: number) => { width: number; height: number } }
-      | undefined;
+    const context = canvas.getContext('2d');
+    expect(context?.drawImage).toHaveBeenCalledWith(video, 96, 162, 1728, 756, 0, 0, 960, 420);
+    expect(jsQrMocks.default).toHaveBeenCalledWith(expect.any(Uint8ClampedArray), 960, 420, {
+      inversionAttempts: 'dontInvert',
+    });
+  });
 
-    expect(config?.qrbox?.(200, 160)).toEqual({ width: 200, height: 160 });
+  it('enables continuous camera focus when the device supports it', async () => {
+    mocks.getRunningTrackCapabilities.mockReturnValue({ focusMode: ['manual', 'continuous'] });
+
+    render(<ScannerHost />);
+
+    await waitFor(() =>
+      expect(mocks.applyVideoConstraints).toHaveBeenCalledWith({
+        advanced: [{ focusMode: 'continuous' }],
+      }),
+    );
   });
 
   it('reports camera start failures through the dedicated handler', async () => {
@@ -228,6 +279,51 @@ describe('useCodeScanner', () => {
     expect(handleScanFailure).not.toHaveBeenCalled();
   });
 
+  it('stops a camera that finishes starting after the scanner unmounts', async () => {
+    let resolveStart: ((value: null) => void) | undefined;
+    mocks.start.mockReturnValueOnce(
+      new Promise<null>((resolve) => {
+        resolveStart = resolve;
+      }),
+    );
+    mocks.getState.mockReturnValueOnce(1).mockReturnValue(2);
+
+    const { unmount } = render(<ScannerHost />);
+    await waitFor(() => expect(mocks.start).toHaveBeenCalled());
+
+    unmount();
+    await act(async () => {
+      resolveStart?.(null);
+    });
+
+    await waitFor(() => expect(mocks.stop).toHaveBeenCalledTimes(1));
+    expect(mocks.clear).toHaveBeenCalled();
+  });
+
+  it('ignores a camera start failure after the scanner unmounts', async () => {
+    let rejectStart: ((error: Error) => void) | undefined;
+    mocks.start.mockReturnValueOnce(
+      new Promise<null>((_resolve, reject) => {
+        rejectStart = reject;
+      }),
+    );
+    const handleCameraStartFailure = vi.fn();
+    const handleScanFailure = vi.fn();
+
+    const { unmount } = render(
+      <ScannerHost onCameraStartFailure={handleCameraStartFailure} onScanFailure={handleScanFailure} />,
+    );
+    await waitFor(() => expect(mocks.start).toHaveBeenCalled());
+
+    unmount();
+    await act(async () => {
+      rejectStart?.(new Error('Camera start canceled'));
+    });
+
+    expect(handleCameraStartFailure).not.toHaveBeenCalled();
+    expect(handleScanFailure).not.toHaveBeenCalled();
+  });
+
   it('uses jsQR first for Safari uploaded QR images', async () => {
     const handleScanSuccess = vi.fn();
     jsQrMocks.default.mockReturnValueOnce({ data: 'JSQR-CODE' });

packages/core/client-v2/src/components/form/ScanInput/useCodeScanner.ts

@@ -9,7 +9,7 @@
 
 import { Html5Qrcode, Html5QrcodeScannerState, Html5QrcodeSupportedFormats } from 'html5-qrcode';
 import jsQR from 'jsqr';
-import { useCallback, useEffect, useState } from 'react';
+import { useCallback, useEffect, useRef, useState } from 'react';
 import type { CodeFormatsToSupport } from './types';
 
 type ScannerSize = {
@@ -21,7 +21,6 @@ type UseCodeScannerOptions = {
   enabled: boolean;
   elementId: string;
   formatsToSupport?: CodeFormatsToSupport;
-  scanBoxSize?: ScannerSize;
   onScannerSizeChanged?: (size: ScannerSize) => void;
   onScanSuccess: (text: string) => void;
   onScanFailure?: () => void;
@@ -38,7 +37,18 @@ type JsQRImageTransform = {
   threshold?: number;
 };
 
+type FocusMediaTrackCapabilities = MediaTrackCapabilities & {
+  focusMode?: string[];
+};
+
+type FocusMediaTrackConstraintSet = MediaTrackConstraintSet & {
+  focusMode?: string;
+};
+
 const QR_SCAN_IMAGE_SIZES = [3200, 2400, 1600, 1000];
+const LIVE_QR_SCAN_INTERVAL = 120;
+const LIVE_QR_SCAN_MAX_WIDTH = 960;
+const LIVE_QR_SCAN_MAX_HEIGHT = 540;
 const QR_SCAN_IMAGE_TRANSFORMS: JsQRImageTransform[] = [
   {},
   { contrast: 3, threshold: 105 },
@@ -66,8 +76,72 @@ export const DEFAULT_CODE_FORMATS: CodeFormatsToSupport = [
 
 export function getCodeScanBoxSize(width: number, height: number) {
   return {
-    width: Math.floor(Math.min(width * 0.82, 520)),
-    height: Math.floor(Math.min(height * 0.32, 240)),
+    width: Math.floor(Math.min((width * 90) / 100, 1152)),
+    height: Math.floor(Math.min((height * 70) / 100, 540)),
+  };
+}
+
+export function scanQrVideoFrame(video: HTMLVideoElement, canvas: HTMLCanvasElement) {
+  if (!video.videoWidth || !video.videoHeight || video.readyState < HTMLMediaElement.HAVE_CURRENT_DATA) {
+    return;
+  }
+
+  const viewfinderWidth = video.clientWidth || video.videoWidth;
+  const viewfinderHeight = video.clientHeight || video.videoHeight;
+  const scanBoxSize = getCodeScanBoxSize(viewfinderWidth, viewfinderHeight);
+  const sourceWidth = Math.min(video.videoWidth, Math.floor(scanBoxSize.width * (video.videoWidth / viewfinderWidth)));
+  const sourceHeight = Math.min(
+    video.videoHeight,
+    Math.floor(scanBoxSize.height * (video.videoHeight / viewfinderHeight)),
+  );
+  const sourceX = Math.floor((video.videoWidth - sourceWidth) / 2);
+  const sourceY = Math.floor((video.videoHeight - sourceHeight) / 2);
+  const targetScale = Math.min(1, LIVE_QR_SCAN_MAX_WIDTH / sourceWidth, LIVE_QR_SCAN_MAX_HEIGHT / sourceHeight);
+  const targetWidth = Math.max(1, Math.floor(sourceWidth * targetScale));
+  const targetHeight = Math.max(1, Math.floor(sourceHeight * targetScale));
+  if (canvas.width !== targetWidth) {
+    canvas.width = targetWidth;
+  }
+  if (canvas.height !== targetHeight) {
+    canvas.height = targetHeight;
+  }
+  const context = canvas.getContext('2d', { willReadFrequently: true });
+  if (!context) {
+    return;
+  }
+
+  context.drawImage(video, sourceX, sourceY, sourceWidth, sourceHeight, 0, 0, targetWidth, targetHeight);
+  const imageData = context.getImageData(0, 0, targetWidth, targetHeight);
+  return jsQR(imageData.data, imageData.width, imageData.height, { inversionAttempts: 'dontInvert' })?.data;
+}
+
+function startLiveQrScan(elementId: string, onScanSuccess: (text: string) => void) {
+  const canvas = document.createElement('canvas');
+  let timer: number | undefined;
+  let stopped = false;
+
+  const scan = () => {
+    if (stopped) {
+      return;
+    }
+    const video = document.getElementById(elementId)?.querySelector('video');
+    if (video) {
+      const decodedText = scanQrVideoFrame(video, canvas);
+      if (decodedText) {
+        stopped = true;
+        onScanSuccess(decodedText);
+        return;
+      }
+    }
+    timer = window.setTimeout(scan, LIVE_QR_SCAN_INTERVAL);
+  };
+
+  timer = window.setTimeout(scan, 0);
+  return () => {
+    stopped = true;
+    if (timer !== undefined) {
+      window.clearTimeout(timer);
+    }
   };
 }
 
@@ -92,6 +166,19 @@ async function stopScanner(scanner?: Html5Qrcode, options: { clear?: boolean } =
   }
 }
 
+async function enableContinuousFocus(scanner: Html5Qrcode) {
+  try {
+    const capabilities = scanner.getRunningTrackCapabilities() as FocusMediaTrackCapabilities;
+    if (!capabilities.focusMode?.includes('continuous')) {
+      return;
+    }
+    const focusConstraints: FocusMediaTrackConstraintSet = { focusMode: 'continuous' };
+    await scanner.applyVideoConstraints({ advanced: [focusConstraints] });
+  } catch {
+    // Some browsers expose incomplete camera capability APIs. Scanning should continue without explicit focus control.
+  }
+}
+
 function isSafariBrowser() {
   const { userAgent, vendor } = navigator;
   return /Apple/i.test(vendor) && /Safari/i.test(userAgent) && !/CriOS|FxiOS|EdgiOS|Chrome/i.test(userAgent);
@@ -216,40 +303,95 @@ export function useCodeScanner({
   enabled,
   elementId,
   formatsToSupport,
-  scanBoxSize,
   onScannerSizeChanged,
   onScanSuccess,
   onScanFailure,
   onCameraStartFailure,
 }: UseCodeScannerOptions) {
   const [scanner, setScanner] = useState<Html5Qrcode>();
+  const liveQrScanStopRef = useRef<() => void>();
+  const scanSucceededRef = useRef(false);
+  const scanSessionRef = useRef(0);
+
+  const stopLiveQrScan = useCallback(() => {
+    liveQrScanStopRef.current?.();
+    liveQrScanStopRef.current = undefined;
+  }, []);
+
+  const cancelActiveScan = useCallback(() => {
+    scanSessionRef.current += 1;
+    stopLiveQrScan();
+  }, [stopLiveQrScan]);
+
+  const reportScanSuccess = useCallback(
+    (text: string) => {
+      if (scanSucceededRef.current) {
+        return;
+      }
+      scanSucceededRef.current = true;
+      stopLiveQrScan();
+      onScanSuccess(text);
+    },
+    [onScanSuccess, stopLiveQrScan],
+  );
 
   const startScanCamera = useCallback(
     async (scannerInstance: Html5Qrcode) => {
-      await scannerInstance.start(
-        { facingMode: 'environment' },
-        {
-          fps: 10,
-          qrbox(width, height) {
-            onScannerSizeChanged?.({ width, height });
-            return clampCodeScanBoxSize(scanBoxSize ?? getCodeScanBoxSize(width, height), width, height);
+      cancelActiveScan();
+      const scanSession = scanSessionRef.current;
+      scanSucceededRef.current = false;
+      try {
+        await scannerInstance.start(
+          { facingMode: 'environment' },
+          {
+            fps: 8,
+            disableFlip: false,
+            videoConstraints: {
+              facingMode: { ideal: 'environment' },
+              width: { ideal: 1920 },
+              height: { ideal: 1080 },
+              frameRate: { ideal: 30 },
+            },
+            qrbox(width, height) {
+              onScannerSizeChanged?.({ width, height });
+              return clampCodeScanBoxSize(getCodeScanBoxSize(width, height), width, height);
+            },
           },
-        },
-        (decodedText) => {
-          onScanSuccess(decodedText);
-        },
-        undefined,
-      );
+          (decodedText) => {
+            reportScanSuccess(decodedText);
+          },
+          undefined,
+        );
+      } catch (error) {
+        if (scanSession !== scanSessionRef.current) {
+          return;
+        }
+        throw error;
+      }
+      if (scanSession !== scanSessionRef.current) {
+        try {
+          await stopScanner(scannerInstance, { clear: true });
+        } catch {
+          // The scanner may already have been cleared by the canceled session cleanup.
+        }
+        return;
+      }
+      if (shouldScanQrWithJsQR(formatsToSupport)) {
+        liveQrScanStopRef.current = startLiveQrScan(elementId, reportScanSuccess);
+      }
+      await enableContinuousFocus(scannerInstance);
     },
-    [onScanSuccess, onScannerSizeChanged, scanBoxSize],
+    [cancelActiveScan, elementId, formatsToSupport, onScannerSizeChanged, reportScanSuccess],
   );
 
   const startScanFile = useCallback(
     async (file: File) => {
+      cancelActiveScan();
+      scanSucceededRef.current = false;
       if (isSafariBrowser() && shouldScanQrWithJsQR(formatsToSupport)) {
         try {
           const decodedText = await scanFileWithJsQR(file, formatsToSupport);
-          onScanSuccess(decodedText);
+          reportScanSuccess(decodedText);
           return;
         } catch {
           // Fall through to html5-qrcode so barcode uploads still work in Safari.
@@ -263,13 +405,13 @@ export function useCodeScanner({
       await stopScanner(scanner);
       try {
         const result = await scanner.scanFileV2(file, false);
-        onScanSuccess(result.decodedText);
+        reportScanSuccess(result.decodedText);
       } catch {
         onScanFailure?.();
         await startScanCamera(scanner);
       }
     },
-    [formatsToSupport, onScanFailure, onScanSuccess, scanner, startScanCamera],
+    [cancelActiveScan, formatsToSupport, onScanFailure, reportScanSuccess, scanner, startScanCamera],
   );
 
   useEffect(() => {
@@ -291,9 +433,10 @@ export function useCodeScanner({
     });
 
     return () => {
+      cancelActiveScan();
       stopScanner(scannerInstance, { clear: true }).catch(() => undefined);
     };
-  }, [elementId, enabled, formatsToSupport, onCameraStartFailure, onScanFailure, startScanCamera]);
+  }, [cancelActiveScan, elementId, enabled, formatsToSupport, onCameraStartFailure, onScanFailure, startScanCamera]);
 
   return {
     startScanFile,