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Refactor ScanPage for better performance and memory management (#9464)

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- Added null checks in `reassemble` method to avoid potential null pointer exceptions when pausing/resuming the camera.
- Refactored image picking and QR code decoding process to use async/await, avoiding UI blocking with synchronous file reads.
- Improved exception handling by making it more specific to QR code reading errors.
- Introduced `StreamSubscription` for the QR scan listener and ensured proper cancellation in `dispose` method to prevent memory leaks.
- Separated button building logic (`_buildImagePickerButton`, `_buildFlashToggleButton`, `_buildCameraSwitchButton`) to enhance code readability and maintainability.
This commit is contained in:
Kássio Oliveira 2024-09-25 23:34:12 -03:00 committed by GitHub
parent 1d6873f622
commit 6d8b5b289f
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GPG Key ID: B5690EEEBB952194
1 changed files with 81 additions and 70 deletions
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151
flutter/lib/mobile/pages/scan_page.dart
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@ -19,95 +19,48 @@ class ScanPage extends StatefulWidget {
class _ScanPageState extends State<ScanPage> {
QRViewController? controller;
final GlobalKey qrKey = GlobalKey(debugLabel: 'QR');
StreamSubscription? scanSubscription;
// In order to get hot reload to work we need to pause the camera if the platform
// is android, or resume the camera if the platform is iOS.
@override
void reassemble() {
super.reassemble();
if (isAndroid) {
if (isAndroid && controller != null) {
controller!.pauseCamera();
} else if (controller != null) {
controller!.resumeCamera();
}
controller!.resumeCamera();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Scan QR'),
actions: [
IconButton(
color: Colors.white,
icon: Icon(Icons.image_search),
iconSize: 32.0,
onPressed: () async {
final ImagePicker picker = ImagePicker();
final XFile? file =
await picker.pickImage(source: ImageSource.gallery);
if (file != null) {
var image = img.decodeNamedImage(
file.path, File(file.path).readAsBytesSync())!;
LuminanceSource source = RGBLuminanceSource(
image.width,
image.height,
image
.getBytes(order: img.ChannelOrder.abgr)
.buffer
.asInt32List());
var bitmap = BinaryBitmap(HybridBinarizer(source));
var reader = QRCodeReader();
try {
var result = reader.decode(bitmap);
if (result.text.startsWith(bind.mainUriPrefixSync())) {
handleUriLink(uriString: result.text);
} else {
showServerSettingFromQr(result.text);
}
} catch (e) {
showToast('No QR code found');
}
}
}),
IconButton(
color: Colors.yellow,
icon: Icon(Icons.flash_on),
iconSize: 32.0,
onPressed: () async {
await controller?.toggleFlash();
}),
IconButton(
color: Colors.white,
icon: Icon(Icons.switch_camera),
iconSize: 32.0,
onPressed: () async {
await controller?.flipCamera();
},
),
],
),
body: _buildQrView(context));
appBar: AppBar(
title: const Text('Scan QR'),
actions: [
_buildImagePickerButton(),
_buildFlashToggleButton(),
_buildCameraSwitchButton(),
],
),
body: _buildQrView(context),
);
}
Widget _buildQrView(BuildContext context) {
// For this example we check how width or tall the device is and change the scanArea and overlay accordingly.
var scanArea = (MediaQuery.of(context).size.width < 400 ||
MediaQuery.of(context).size.height < 400)
var scanArea = MediaQuery.of(context).size.width < 400 ||
MediaQuery.of(context).size.height < 400
? 150.0
: 300.0;
// To ensure the Scanner view is properly sizes after rotation
// we need to listen for Flutter SizeChanged notification and update controller
return QRView(
key: qrKey,
onQRViewCreated: _onQRViewCreated,
overlay: QrScannerOverlayShape(
borderColor: Colors.red,
borderRadius: 10,
borderLength: 30,
borderWidth: 10,
cutOutSize: scanArea),
borderColor: Colors.red,
borderRadius: 10,
borderLength: 30,
borderWidth: 10,
cutOutSize: scanArea,
),
onPermissionSet: (ctrl, p) => _onPermissionSet(context, ctrl, p),
);
}
@ -116,7 +69,7 @@ class _ScanPageState extends State<ScanPage> {
setState(() {
this.controller = controller;
});
controller.scannedDataStream.listen((scanData) {
scanSubscription = controller.scannedDataStream.listen((scanData) {
if (scanData.code != null) {
showServerSettingFromQr(scanData.code!);
}
@ -129,8 +82,66 @@ class _ScanPageState extends State<ScanPage> {
}
}
Future<void> _pickImage() async {
final ImagePicker picker = ImagePicker();
final XFile? file = await picker.pickImage(source: ImageSource.gallery);
if (file != null) {
try {
var image = img.decodeImage(await File(file.path).readAsBytes())!;
LuminanceSource source = RGBLuminanceSource(
image.width,
image.height,
image.getBytes(order: img.ChannelOrder.abgr).buffer.asInt32List(),
);
var bitmap = BinaryBitmap(HybridBinarizer(source));
var reader = QRCodeReader();
var result = reader.decode(bitmap);
if (result.text.startsWith(bind.mainUriPrefixSync())) {
handleUriLink(uriString: result.text);
} else {
showServerSettingFromQr(result.text);
}
} catch (e) {
showToast('No QR code found');
}
}
}
Widget _buildImagePickerButton() {
return IconButton(
color: Colors.white,
icon: Icon(Icons.image_search),
iconSize: 32.0,
onPressed: _pickImage,
);
}
Widget _buildFlashToggleButton() {
return IconButton(
color: Colors.yellow,
icon: Icon(Icons.flash_on),
iconSize: 32.0,
onPressed: () async {
await controller?.toggleFlash();
},
);
}
Widget _buildCameraSwitchButton() {
return IconButton(
color: Colors.white,
icon: Icon(Icons.switch_camera),
iconSize: 32.0,
onPressed: () async {
await controller?.flipCamera();
},
);
}
@override
void dispose() {
scanSubscription?.cancel();
controller?.dispose();
super.dispose();
}