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

Simplfiy controller, expose scanDataStream
flutter-beta
juliuscanute 7 år sedan
committed by GitHub
förälder
576671aaa0 224d1ebb71
incheckning
3d1f6c11d4
Ingen känd nyckel hittad för denna signaturen i databasen GPG-nyckel ID: 4AEE18F83AFDEB23
3 ändrade filer med 165 tillägg och 116 borttagningar
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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 Visa fil

@@ -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 Visa fil

@@ -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 Visa fil

@@ -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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