Adjusted the handling of to be displayed webcams

data/Labcontrol.conf

@@ -49,6 +49,8 @@ terminal_emulator_command=/usr/bin/gnome-terminal
 user_name_on_clients=user
 vnc_viewer=/usr/bin/vinagre
 wakeonlan_command=/usr/bin/wakeonlan
+# The program used to view the laboratory's webcams
+webcam_command=/usr/local/bin/WebcamDisplay
 # URLs to available webcams
 webcams="webcam_left|webcam_right"
 wine_command=/usr/bin/wine

src/Lib/settings.cpp

@@ -77,6 +77,9 @@ lc::Settings::Settings( const QSettings &argSettings, QObject *argParent ) :
     wakeonlanCmd{ ReadSettingsItem( "wakeonlan_command",
                                     "Booting the clients will not work.",
                                     argSettings, true ) },
+    webcamDisplayCmd{ ReadSettingsItem( "webcam_command",
+                                        "Displaying the laboratory's webcams will not work.",
+                                        argSettings, true ) },
     webcams{ argSettings.value( "webcams", "" ).toString().split( '|', QString::SkipEmptyParts,
                                                                   Qt::CaseInsensitive ) },
     wineCmd{ ReadSettingsItem( "wine_command",

src/Lib/settings.h

@@ -44,6 +44,7 @@ public:
     const QString userNameOnClients;
     const QString vncViewer;
     const QString wakeonlanCmd;
+    const QString webcamDisplayCmd;
     const QStringList webcams;
     const QString wineCmd;
     const QString wmctrlCmd;

src/mainwindow.cpp

@@ -176,6 +176,13 @@ void lc::MainWindow::DisableDisfunctionalWidgets() {
         ui->PBBoot->setEnabled( false );
     }
 
+    // Deactivate the webcam choosing interface if no webcams are available or the viewer is missing
+    if ( settings->webcamDisplayCmd.isEmpty()
+         || settings->webcams.isEmpty() ) {
+        ui->CBWebcamChooser->setEnabled( false );
+        ui->LWebcamChooser->setEnabled( false );
+    }
+
     // Disable the disable screensaver function if the 'xset_command' was not set
     if ( settings->xsetCmd.isEmpty() ) {
         ui->PBDeactivateScreensaver->setEnabled( false );
@@ -206,7 +213,7 @@ void lc::MainWindow::LoadIconPixmaps() {
 
 void lc::MainWindow::on_CBWebcamChooser_activated( int argIndex ) {
     if (  argIndex != 0 ) {
-        QString program{ settings->lcInstDir + "/webcam_display" };
+        QString program{ settings->webcamDisplayCmd };
         QStringList arguments;
         arguments << ui->CBWebcamChooser->currentText();
 
@@ -646,12 +653,6 @@ void lc::MainWindow::SetupWidgets() {
         for ( const auto &s : settings->webcams )
             ui->CBWebcamChooser->addItem( s );
     }
-
-    // Deactivate the webcam choosing interface, if no webcams are available
-    if ( ui->CBWebcamChooser->count() == 0 ) {
-        ui->LWebcamChooser->setEnabled( false );
-        ui->CBWebcamChooser->setEnabled( false );
-    }
     clients = nullptr;
 
     const QStringList &zTreeEntries = settings->installedZTreeVersions;