btscanner example: Add option to stop a running scan

Change-Id: Id82f6c903938e289559a79b4a2383ad20944c61a
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>

3 files changed, 20 insertions, 2 deletions

diff --git a/examples/bluetooth/btscanner/device.cpp b/examples/bluetooth/btscanner/device.cpp
index 33e29e07..82c1f846 100644
--- a/examples/bluetooth/btscanner/device.cpp
+++ b/examples/bluetooth/btscanner/device.cpp
@@ -72,6 +72,7 @@ DeviceDiscoveryDialog::DeviceDiscoveryDialog(QWidget *parent) :
     ui(new Ui_DeviceDiscovery)
 {
     ui->setupUi(this);
+    ui->stopScan->setVisible(false);
 
     // In case of multiple Bluetooth adapters it is possible to set the adapter
     // to be used. Example code:
@@ -82,6 +83,7 @@ DeviceDiscoveryDialog::DeviceDiscoveryDialog(QWidget *parent) :
     discoveryAgent = new QBluetoothDeviceDiscoveryAgent();
 
     connect(ui->scan, &QAbstractButton::clicked, this, &DeviceDiscoveryDialog::startScan);
+    connect(ui->stopScan, &QAbstractButton::clicked, this, &DeviceDiscoveryDialog::stopScan);
 
     connect(discoveryAgent, &QBluetoothDeviceDiscoveryAgent::deviceDiscovered,
             this, &DeviceDiscoveryDialog::addDevice);
@@ -123,12 +125,20 @@ void DeviceDiscoveryDialog::addDevice(const QBluetoothDeviceInfo &info)
 void DeviceDiscoveryDialog::startScan()
 {
     discoveryAgent->start();
-    ui->scan->setEnabled(false);
+    ui->scan->setVisible(false);
+    ui->stopScan->setVisible(true);
+}
+
+void DeviceDiscoveryDialog::stopScan()
+{
+    discoveryAgent->stop();
+    scanFinished();
 }
 
 void DeviceDiscoveryDialog::scanFinished()
 {
-    ui->scan->setEnabled(true);
+    ui->scan->setVisible(true);
+    ui->stopScan->setVisible(false);
 }
 
 void DeviceDiscoveryDialog::itemActivated(QListWidgetItem *item)
diff --git a/examples/bluetooth/btscanner/device.h b/examples/bluetooth/btscanner/device.h
index 0bad0361..440851c9 100644
--- a/examples/bluetooth/btscanner/device.h
+++ b/examples/bluetooth/btscanner/device.h
@@ -79,6 +79,7 @@ public slots:
     void pairingDone(const QBluetoothAddress&, QBluetoothLocalDevice::Pairing);
 private slots:
     void startScan();
+    void stopScan();
     void scanFinished();
     void itemActivated(QListWidgetItem *item);
     void hostModeStateChanged(QBluetoothLocalDevice::HostMode);
diff --git a/examples/bluetooth/btscanner/device.ui b/examples/bluetooth/btscanner/device.ui
index fa81c5cb..fd86a358 100644
--- a/examples/bluetooth/btscanner/device.ui
+++ b/examples/bluetooth/btscanner/device.ui
@@ -56,6 +56,13 @@
       </widget>
      </item>
      <item>
+      <widget class="QPushButton" name="stopScan">
+       <property name="text">
+        <string>Stop scan</string>
+       </property>
+      </widget>
+     </item>
+     <item>
       <widget class="QPushButton" name="clear">
        <property name="text">
         <string>Clear</string>