From ddd55e18a1a9a5b0f803f814493895b8c1a2ac8c Mon Sep 17 00:00:00 2001
From: Luis Thein <lthein@multamedio.de>
Date: Thu, 18 Jul 2019 08:50:52 +0200
Subject: [PATCH] Added methods for pausing/resuming camera

---
 .../net/touchcapture/qr/flutterqr/QRView.kt   | 17 ++++++++++++
 example/lib/main.dart                         | 26 ++++++++++++++++++-
 ios/Classes/QRView.swift                      | 20 ++++++++++++++
 lib/qr_code_scanner.dart                      | 11 ++++++--
 4 files changed, 71 insertions(+), 3 deletions(-)

diff --git a/android/src/main/kotlin/net/touchcapture/qr/flutterqr/QRView.kt b/android/src/main/kotlin/net/touchcapture/qr/flutterqr/QRView.kt
index b3b6e70..8a7aa37 100644
--- a/android/src/main/kotlin/net/touchcapture/qr/flutterqr/QRView.kt
+++ b/android/src/main/kotlin/net/touchcapture/qr/flutterqr/QRView.kt
@@ -87,6 +87,17 @@ class QRView(private val registrar: PluginRegistry.Registrar, id: Int) :
         barcodeView?.resume()
     }
 
+    private fun pauseCamera() {
+        if (barcodeView!!.isPreviewActive) {
+            barcodeView?.pause()
+        }
+    }
+
+    private fun resumeCamera() {
+        if (!barcodeView!!.isPreviewActive) {
+            barcodeView?.resume()
+        }
+    }
 
     override fun getView(): View {
         return initBarCodeView()?.apply {
@@ -147,6 +158,12 @@ class QRView(private val registrar: PluginRegistry.Registrar, id: Int) :
             "flipFlash" -> {
                 flipFlash()
             }
+            "pauseCamera" -> {
+                pauseCamera()
+            }
+            "resumeCamera" -> {
+                resumeCamera()
+            }
         }
     }
 
diff --git a/example/lib/main.dart b/example/lib/main.dart
index 00db09e..6f48ea3 100644
--- a/example/lib/main.dart
+++ b/example/lib/main.dart
@@ -85,7 +85,31 @@ class _QRViewExampleState extends State<QRViewExample> {
                       ),
                     )
                   ],
-                )
+                ),
+                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)),
+                      ),
+                    ),
+                    Container(
+                      margin: EdgeInsets.only(bottom: 8.0),
+                      child: RaisedButton(
+                        onPressed: () {
+                          controller.resumeCamera();
+                        },
+                        child: Text('resume', style: TextStyle(fontSize: 20)),
+                      ),
+                    )
+                  ],
+                ),
               ],
             ),
             flex: 1,
diff --git a/ios/Classes/QRView.swift b/ios/Classes/QRView.swift
index 76384b8..134db76 100644
--- a/ios/Classes/QRView.swift
+++ b/ios/Classes/QRView.swift
@@ -50,6 +50,10 @@ public class QRView:NSObject,FlutterPlatformView {
                     self?.flipCamera()
                 case "flipFlash":
                     self?.flipFlash()
+                case "pauseCamera":
+                    self?.pauseCamera()
+                case "resumeCamera":
+                    self?.resumeCamera()
                 default:
                     result(FlutterMethodNotImplemented)
                     return
@@ -79,4 +83,20 @@ public class QRView:NSObject,FlutterPlatformView {
             }
         }
     }
+    
+    func pauseCamera() {
+        if let sc: MTBBarcodeScanner = scanner {
+            if sc.isScanning() {
+                sc.freezeCapture()
+            }
+        }
+    }
+    
+    func resumeCamera() {
+        if let sc: MTBBarcodeScanner = scanner {
+            if !sc.isScanning() {
+                sc.unfreezeCapture()
+            }
+        }
+    }
 }
diff --git a/lib/qr_code_scanner.dart b/lib/qr_code_scanner.dart
index 7c463a4..4325376 100644
--- a/lib/qr_code_scanner.dart
+++ b/lib/qr_code_scanner.dart
@@ -83,12 +83,19 @@ class QRViewController {
     }
   }
 
-  void flipCamera(){
+  void flipCamera() {
     channel.invokeMethod("flipCamera");
   }
 
-  void flipFlash(){
+  void flipFlash() {
     channel.invokeMethod("flipFlash");
   }
 
+  void pauseCamera() {
+    channel.invokeMethod("pauseCamera");
+  }
+
+  void resumeCamera() {
+    channel.invokeMethod("resumeCamera");
+  }
 }