Ask to save calibration when closing the app

Software/PC_Application/VNA/vna.cpp

@@ -53,6 +53,7 @@ VNA::VNA(AppWindow *window)
     calValid = false;
     calMeasuring = false;
     calDialog.reset();
+    calEdited = false;
 
     // Create default traces
     auto tS11 = new Trace("S11", Qt::yellow);
@@ -104,10 +105,13 @@ VNA::VNA(AppWindow *window)
         } else {
             ApplyCalibration(cal.getType());
         }
+        calEdited = false;
     });
 
     connect(saveCal, &QAction::triggered, [=](){
-       cal.saveToFile();
+        if(cal.saveToFile()) {
+            calEdited = false;
+        }
     });
 
     auto calDisable = calMenu->addAction("Disabled");
@@ -508,6 +512,16 @@ void VNA::deviceDisconnected()
     defaultCalMenu->setEnabled(false);
 }
 
+void VNA::shutdown()
+{
+    if(calEdited && calValid) {
+        auto save = InformationBox::AskQuestion("Save calibration?", "The calibration contains data that has not been saved yet. Do you want to save it before exiting?", false);
+        if(save) {
+            cal.saveToFile();
+        }
+    }
+}
+
 nlohmann::json VNA::toJSON()
 {
     nlohmann::json j;
@@ -798,6 +812,7 @@ void VNA::StartCalibrationMeasurement(Calibration::Measurement m)
         // enable calibration measurement only in transmission callback (prevents accidental sampling of data which was still being processed)
         calMeasuring = true;
     });
+    calEdited = true;
 }
 
 void VNA::ConstrainAndUpdateFrequencies()

Software/PC_Application/VNA/vna.h

@@ -19,6 +19,7 @@ public:
     void deactivate() override;
     void initializeDevice() override;
     void deviceDisconnected() override;
+    void shutdown() override;
 
     // Only save/load user changeable stuff, no need to save the widgets/mode name etc.
     virtual nlohmann::json toJSON() override;
@@ -67,6 +68,7 @@ private:
     // Calibration
     Calibration cal;
     bool calValid;
+    bool calEdited;
     Calibration::Measurement calMeasurement;
     bool calMeasuring;
     bool calWaitFirst;