lisper
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qr_code_scanner
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Merge pull request #28 from LuisThein/feature/scanDataStream 

Simplfiy controller, expose scanDataStream
flutter-beta
juliuscanute há 7 anos
committed by GitHub
ascendente
576671aaa0 224d1ebb71
cometimento
3d1f6c11d4
Não foi encontrada uma chave conhecida para esta assinatura, na base de dados ID da chave GPG: 4AEE18F83AFDEB23
3 ficheiros alterados com 165 adições e 116 eliminações
Visualização em 2 colunas
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  1. +40
    -20
      README.md
  2. +89
    -83
      example/lib/main.dart
  3. +36
    -13
      lib/qr_code_scanner.dart

+ 40
- 20
README.md Ver ficheiro

@@ -60,31 +60,39 @@ class _QRViewExampleState extends State<QRViewExample> {
Widget build(BuildContext context) {
return Scaffold(
body: Column(
children: <Widget>[
QRView(
key: qrKey,
onQRViewCreated: _onQRViewCreated,
),
],
),
);
children: <Widget>[
Expanded(
flex: 5,
child: QRView(
key: qrKey,
onQRViewCreated: _onQRViewCreated,
),
),
Expanded(
flex: 1,
child: Center(
child: Text('Scan result: $qrText'),
),
)
],
),
);
}

void _onQRViewCreated(QRViewController controller) {
final channel = controller.channel;
controller.init(qrKey);
this.controller = controller;
channel.setMethodCallHandler((MethodCall call) async {
switch (call.method) {
case "onRecognizeQR":
dynamic arguments = call.arguments;
setState(() {
qrText = arguments.toString();
});
}
controller.scannedDataStream.listen((scanData) {
setState(() {
qrText = scanData;
});
});
}

@override
void dispose() {
controller?.dispose();
super.dispose();
}
}
```

@@ -104,9 +112,21 @@ controller.flipCamera();
## Flash (Off/On)
By default, flash is OFF.
```dart
controller.flipFlash();
controller.toggleFlash();
```

## Resume/Pause
Pause camera stream and scanner.
```dart
controller.pause();
```
Resume camera stream and scanner.
```dart
controller.resume();
```



# TODO'S:
* iOS Native embedding is written to match what is supported in the framework as of the date of publication of this package. It needs to be improved as the framework support improves.
* In future, options will be provided for default states.


+ 89
- 83
example/lib/main.dart Ver ficheiro

@@ -1,5 +1,4 @@
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:qr_code_scanner/qr_code_scanner.dart';

void main() => runApp(MaterialApp(home: QRViewExample()));
@@ -19,11 +18,11 @@ class QRViewExample extends StatefulWidget {
}

class _QRViewExampleState extends State<QRViewExample> {
final GlobalKey qrKey = GlobalKey(debugLabel: 'QR');
var qrText = "";
var flashState = flash_on;
var cameraState = front_camera;
QRViewController controller;
final GlobalKey qrKey = GlobalKey(debugLabel: 'QR');

@override
Widget build(BuildContext context) {
@@ -38,79 +37,86 @@ class _QRViewExampleState extends State<QRViewExample> {
flex: 4,
),
Expanded(
child: Column(
children: <Widget>[
Text("This is the result of scan: $qrText"),
Row(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Container(
margin: EdgeInsets.all(8.0),
child: RaisedButton(
onPressed: () {
if (controller != null) {
controller.toggleFlash();
if (_isFlashOn(flashState))
setState(() {
flashState = flash_off;
});
else
setState(() {
flashState = flash_on;
});
}
},
child: Text(flashState, style: TextStyle(fontSize: 20)),
),
),
Container(
margin: EdgeInsets.all(8.0),
child: RaisedButton(
onPressed: () {
if (controller != null) {
controller.flipCamera();
if (_isBackCamera(cameraState))
setState(() {
cameraState = front_camera;
});
else
setState(() {
cameraState = back_camera;
});
}
},
child:
Text(cameraState, style: TextStyle(fontSize: 20)),
),
)
],
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Container(
margin: EdgeInsets.only(bottom: 8.0),
child: RaisedButton(
onPressed: () {
controller?.pauseCamera();
},
child: Text('pause', style: TextStyle(fontSize: 20)),
child: FittedBox(
fit: BoxFit.contain,
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
Text("This is the result of scan: $qrText"),
Row(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Container(
margin: EdgeInsets.all(8.0),
child: RaisedButton(
onPressed: () {
if (controller != null) {
controller.toggleFlash();
if (_isFlashOn(flashState)) {
setState(() {
flashState = flash_off;
});
} else {
setState(() {
flashState = flash_on;
});
}
}
},
child:
Text(flashState, style: TextStyle(fontSize: 20)),
),
),
),
Container(
margin: EdgeInsets.only(bottom: 8.0),
child: RaisedButton(
onPressed: () {
controller.resumeCamera();
},
child: Text('resume', style: TextStyle(fontSize: 20)),
Container(
margin: EdgeInsets.all(8.0),
child: RaisedButton(
onPressed: () {
if (controller != null) {
controller.flipCamera();
if (_isBackCamera(cameraState)) {
setState(() {
cameraState = front_camera;
});
} else {
setState(() {
cameraState = back_camera;
});
}
}
},
child:
Text(cameraState, style: TextStyle(fontSize: 20)),
),
)
],
),
Row(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Container(
margin: EdgeInsets.all(8.0),
child: RaisedButton(
onPressed: () {
controller?.pauseCamera();
},
child: Text('pause', style: TextStyle(fontSize: 20)),
),
),
)
],
),
],
Container(
margin: EdgeInsets.all(8.0),
child: RaisedButton(
onPressed: () {
controller?.resumeCamera();
},
child: Text('resume', style: TextStyle(fontSize: 20)),
),
)
],
),
],
),
),
flex: 1,
)
@@ -128,17 +134,17 @@ class _QRViewExampleState extends State<QRViewExample> {
}

void _onQRViewCreated(QRViewController controller) {
final channel = controller.channel;
controller.init(qrKey);
this.controller = controller;
channel.setMethodCallHandler((MethodCall call) async {
switch (call.method) {
case "onRecognizeQR":
dynamic arguments = call.arguments;
setState(() {
qrText = arguments.toString();
});
}
controller.scannedDataStream.listen((scanData) {
setState(() {
qrText = scanData;
});
});
}

@override
void dispose() {
controller.dispose();
super.dispose();
}
}

+ 36
- 13
lib/qr_code_scanner.dart Ver ficheiro

@@ -1,3 +1,5 @@
import 'dart:async';

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
@@ -6,9 +8,11 @@ typedef void QRViewCreatedCallback(QRViewController controller);

class QRView extends StatefulWidget {
const QRView({
Key key,
this.onQRViewCreated,
}) : super(key: key);
@required Key key,
@required this.onQRViewCreated,
}) : assert(key != null),
assert(onQRViewCreated != null),
super(key: key);

final QRViewCreatedCallback onQRViewCreated;

@@ -45,7 +49,7 @@ class _QRViewState extends State<QRView> {
if (widget.onQRViewCreated == null) {
return;
}
widget.onQRViewCreated(new QRViewController._(id));
widget.onQRViewCreated(QRViewController._(id, widget.key));
}
}

@@ -71,31 +75,50 @@ class _CreationParams {
}

class QRViewController {
QRViewController._(int id)
: channel = MethodChannel('net.touchcapture.qr.flutterqr/qrview_$id');
final MethodChannel channel;
static const scanMethodCall = "onRecognizeQR";

final MethodChannel _channel;

StreamController<String> _scanUpdateController = StreamController<String>();

Stream<String> get scannedDataStream => _scanUpdateController.stream;

void init(GlobalKey qrKey) {
QRViewController._(int id, GlobalKey qrKey)
: _channel = MethodChannel('net.touchcapture.qr.flutterqr/qrview_$id') {
if (defaultTargetPlatform == TargetPlatform.iOS) {
final RenderBox renderBox = qrKey.currentContext.findRenderObject();
channel.invokeMethod("setDimensions",
_channel.invokeMethod("setDimensions",
{"width": renderBox.size.width, "height": renderBox.size.height});
}
_channel.setMethodCallHandler(
(MethodCall call) async {
switch (call.method) {
case scanMethodCall:
if (call.arguments != null) {
_scanUpdateController.sink.add(call.arguments.toString());
}
}
},
);
}

void flipCamera() {
channel.invokeMethod("flipCamera");
_channel.invokeMethod("flipCamera");
}

void toggleFlash() {
channel.invokeMethod("toggleFlash");
_channel.invokeMethod("toggleFlash");
}

void pauseCamera() {
channel.invokeMethod("pauseCamera");
_channel.invokeMethod("pauseCamera");
}

void resumeCamera() {
channel.invokeMethod("resumeCamera");
_channel.invokeMethod("resumeCamera");
}

void dispose() {
_scanUpdateController.close();
}
}

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