Serial port settings are mutually exclusive

companion/src/generaledit/hardware.cpp

@@ -35,6 +35,50 @@ constexpr char FIM_SWITCHTYPE2POS[]  {"Switch Type 2 Pos"};
 constexpr char FIM_SWITCHTYPE3POS[]  {"Switch Type 3 Pos"};
 constexpr char FIM_INTERNALMODULES[] {"Internal Modules"};
 
+class ExclusiveComboGroup: public QObject
+{
+  static constexpr auto _role = Qt::UserRole + 500;
+
+  QList<QComboBox*> combos;
+  std::function<bool(const QVariant&)> filter;
+  
+public:
+ ExclusiveComboGroup(QObject *parent, std::function<bool(const QVariant&)> filter) :
+   QObject(parent), filter(std::move(filter))
+ {
+ }
+
+ void addCombo(QComboBox *comboBox)
+ {
+   connect(comboBox, QOverload<int>::of(&QComboBox::activated),
+           [=](int index) { this->handleActivated(comboBox, index); });
+   combos.append(comboBox);
+  }
+
+  void handleActivated(QComboBox* target, int index) {
+    auto data = target->itemData(index);
+    auto targetidx = combos.indexOf(target);
+    for (auto combo : combos) {
+      if (target == combo) continue;
+      auto view = dynamic_cast<QListView*>(combo->view());
+      Q_ASSERT(view);
+
+      auto previous = combo->findData(targetidx, _role);
+      if (previous >= 0) {
+        view->setRowHidden(previous, false);
+        combo->setItemData(previous, QVariant(), _role);
+      }
+      if (!filter(data)) {
+        auto idx = combo->findData(data);
+        if (idx >= 0) {
+          view->setRowHidden(idx, true);
+          combo->setItemData(idx, targetidx, _role);
+        }
+      }
+    }
+  }
+};
+
 HardwarePanel::HardwarePanel(QWidget * parent, GeneralSettings & generalSettings, Firmware * firmware, CompoundItemModelFactory * sharedItemModels):
   GeneralPanel(parent, generalSettings, firmware),
   board(firmware->getBoard()),
@@ -150,6 +194,10 @@ HardwarePanel::HardwarePanel(QWidget * parent, GeneralSettings & generalSettings
     addParams(row, maxBaudRate);
   }
 
+  // All values except 0 are mutually exclusive
+  ExclusiveComboGroup *exclGroup = new ExclusiveComboGroup(
+      this, [=](const QVariant &value) { return value == 0; });
+
   if (firmware->getCapability(HasAuxSerialMode)) {
     QString lbl = "Serial Port";
     if (IS_RADIOMASTER_TX16S(board))
@@ -158,6 +206,7 @@ HardwarePanel::HardwarePanel(QWidget * parent, GeneralSettings & generalSettings
     AutoComboBox *serialPortMode = new AutoComboBox(this);
     serialPortMode->setModel(editorItemModels->getItemModel(auxmodelid));
     serialPortMode->setField(generalSettings.serialPort[GeneralSettings::SP_AUX1]);
+    exclGroup->addCombo(serialPortMode);
     addParams(row, serialPortMode);
   }
 
@@ -169,6 +218,7 @@ HardwarePanel::HardwarePanel(QWidget * parent, GeneralSettings & generalSettings
     AutoComboBox *serialPortMode = new AutoComboBox(this);
     serialPortMode->setModel(editorItemModels->getItemModel(auxmodelid));
     serialPortMode->setField(generalSettings.serialPort[GeneralSettings::SP_AUX2]);
+    exclGroup->addCombo(serialPortMode);
     addParams(row, serialPortMode);
   }
 
@@ -177,6 +227,7 @@ HardwarePanel::HardwarePanel(QWidget * parent, GeneralSettings & generalSettings
     AutoComboBox *serialPortMode = new AutoComboBox(this);
     serialPortMode->setModel(editorItemModels->getItemModel(vcpmodelid));
     serialPortMode->setField(generalSettings.serialPort[GeneralSettings::SP_VCP]);
+    exclGroup->addCombo(serialPortMode);
     addParams(row, serialPortMode);
   }