Add temperature units setting

src/FactSystem/FactMetaData.cc

@@ -46,6 +46,7 @@ const FactMetaData::AppSettingsTranslation_s FactMetaData::_rgAppSettingsTransla
     { "meters", "meters",   false,  UnitsSettings::DistanceUnitsMeters,         FactMetaData::_defaultTranslator,                   FactMetaData::_defaultTranslator },
     { "cm/px",  "cm/px",    false,  UnitsSettings::DistanceUnitsMeters,         FactMetaData::_defaultTranslator,                   FactMetaData::_defaultTranslator },
     { "m/s",    "m/s",      true,   UnitsSettings::SpeedUnitsMetersPerSecond,   FactMetaData::_defaultTranslator,                   FactMetaData::_defaultTranslator },
+    { "C",      "C",        false,  UnitsSettings::TemperatureUnitsCelsius,     FactMetaData::_defaultTranslator,                   FactMetaData::_defaultTranslator },
     { "m^2",    "m^2",      false,  UnitsSettings::AreaUnitsSquareMeters,       FactMetaData::_defaultTranslator,                   FactMetaData::_defaultTranslator },
     { "m",      "ft",       false,  UnitsSettings::DistanceUnitsFeet,           FactMetaData::_metersToFeet,                        FactMetaData::_feetToMeters },
     { "meters", "ft",       false,  UnitsSettings::DistanceUnitsFeet,           FactMetaData::_metersToFeet,                        FactMetaData::_feetToMeters },
@@ -59,6 +60,7 @@ const FactMetaData::AppSettingsTranslation_s FactMetaData::_rgAppSettingsTransla
     { "m/s",    "mph",      true,   UnitsSettings::SpeedUnitsMilesPerHour,      FactMetaData::_metersPerSecondToMilesPerHour,       FactMetaData::_milesPerHourToMetersPerSecond },
     { "m/s",    "km/h",     true,   UnitsSettings::SpeedUnitsKilometersPerHour, FactMetaData::_metersPerSecondToKilometersPerHour,  FactMetaData::_kilometersPerHourToMetersPerSecond },
     { "m/s",    "kn",       true,   UnitsSettings::SpeedUnitsKnots,             FactMetaData::_metersPerSecondToKnots,              FactMetaData::_knotsToMetersPerSecond },
+    { "C",      "F",        false,  UnitsSettings::TemperatureUnitsFarenheit,   FactMetaData::_celsiusToFarenheit,                  FactMetaData::_farenheitToCelsius },
 };
 
 const char* FactMetaData::_decimalPlacesJsonKey =       "decimalPlaces";
@@ -685,6 +687,16 @@ QVariant FactMetaData::_inchesToCentimeters(const QVariant& inches)
     return QVariant(inches.toDouble() * constants.inchesToCentimeters);
 }
 
+QVariant FactMetaData::_celsiusToFarenheit(const QVariant& celsius)
+{
+    return QVariant(celsius.toDouble() * (9.0 / 5.0) + 32);
+}
+
+QVariant FactMetaData::_farenheitToCelsius(const QVariant& farenheit)
+{
+    return QVariant((farenheit.toDouble() - 32) * (5.0 / 9.0));
+}
+
 void FactMetaData::setRawUnits(const QString& rawUnits)
 {
     _rawUnits = rawUnits;
@@ -774,9 +786,11 @@ void FactMetaData::_setAppSettingsTranslators(void)
         for (size_t i=0; i<sizeof(_rgAppSettingsTranslations)/sizeof(_rgAppSettingsTranslations[0]); i++) {
             const AppSettingsTranslation_s* pAppSettingsTranslation = &_rgAppSettingsTranslations[i];
 
-            if (pAppSettingsTranslation->rawUnits == _rawUnits.toLower() &&
+            if ((pAppSettingsTranslation->rawUnits == _rawUnits && // Temperature
+                    (!pAppSettingsTranslation->speed && pAppSettingsTranslation->speedOrDistanceUnits == qgcApp()->toolbox()->settingsManager()->unitsSettings()->temperatureUnits()->rawValue().toUInt())) ||
+            (pAppSettingsTranslation->rawUnits == _rawUnits.toLower() && // Speed and Distance
                     ((pAppSettingsTranslation->speed && pAppSettingsTranslation->speedOrDistanceUnits == qgcApp()->toolbox()->settingsManager()->unitsSettings()->speedUnits()->rawValue().toUInt()) ||
-                     (!pAppSettingsTranslation->speed && pAppSettingsTranslation->speedOrDistanceUnits == qgcApp()->toolbox()->settingsManager()->unitsSettings()->distanceUnits()->rawValue().toUInt()))) {
+                    (!pAppSettingsTranslation->speed && pAppSettingsTranslation->speedOrDistanceUnits == qgcApp()->toolbox()->settingsManager()->unitsSettings()->distanceUnits()->rawValue().toUInt())))) {
                 _cookedUnits = pAppSettingsTranslation->cookedUnits;
                 setTranslators(pAppSettingsTranslation->rawTranslator, pAppSettingsTranslation->cookedTranslator);
                 return;

src/FactSystem/FactMetaData.h

@@ -193,6 +193,8 @@ private:
     static QVariant _normToPercent(const QVariant& normalized);
     static QVariant _centimetersToInches(const QVariant& centimeters);
     static QVariant _inchesToCentimeters(const QVariant& inches);
+    static QVariant _celsiusToFarenheit(const QVariant& celsius);
+    static QVariant _farenheitToCelsius(const QVariant& farenheit);
 
     struct AppSettingsTranslation_s {
         const char* rawUnits;

src/Settings/UnitsSettings.cc

@@ -16,12 +16,14 @@ const char* UnitsSettings::unitsSettingsGroupName =     "Units";
 const char* UnitsSettings::distanceUnitsSettingsName =  "DistanceUnits";
 const char* UnitsSettings::areaUnitsSettingsName =      "AreaUnits";
 const char* UnitsSettings::speedUnitsSettingsName =     "SpeedUnits";
+const char* UnitsSettings::temperatureUnitsSettingsName = "TemperatureUnits";
 
 UnitsSettings::UnitsSettings(QObject* parent)
     : SettingsGroup(unitsSettingsGroupName, QString() /* root settings group */, parent)
     , _distanceUnitsFact(NULL)
     , _areaUnitsFact(NULL)
     , _speedUnitsFact(NULL)
+    , _temperatureUnitsFact(NULL)
 {
     QQmlEngine::setObjectOwnership(this, QQmlEngine::CppOwnership);
     qmlRegisterUncreatableType<UnitsSettings>("QGroundControl.SettingsManager", 1, 0, "UnitsSettings", "Reference only");
@@ -92,3 +94,24 @@ Fact* UnitsSettings::speedUnits(void)
 
     return _speedUnitsFact;
 }
+
+Fact* UnitsSettings::temperatureUnits(void)
+{
+    if (!_temperatureUnitsFact) {
+        // Units settings can't be loaded from json since it creates an infinite loop of meta data loading.
+        QStringList     enumStrings;
+        QVariantList    enumValues;
+
+        enumStrings << "Celsius" << "Farenheit";
+        enumValues << QVariant::fromValue((uint32_t)TemperatureUnitsCelsius) << QVariant::fromValue((uint32_t)TemperatureUnitsFarenheit);
+
+        FactMetaData* metaData = new FactMetaData(FactMetaData::valueTypeUint32, this);
+        metaData->setName(temperatureUnitsSettingsName);
+        metaData->setEnumInfo(enumStrings, enumValues);
+        metaData->setRawDefaultValue(TemperatureUnitsCelsius);
+
+        _temperatureUnitsFact = new SettingsFact(QString() /* no settings group */, metaData, this);
+    }
+
+    return _temperatureUnitsFact;
+}

src/Settings/UnitsSettings.h

@@ -41,28 +41,38 @@ public:
         SpeedUnitsKnots,
     };
 
+    enum TemperatureUnits {
+        TemperatureUnitsCelsius = 0,
+        TemperatureUnitsFarenheit,
+    };
+
     Q_ENUMS(DistanceUnits)
     Q_ENUMS(AreaUnits)
     Q_ENUMS(SpeedUnits)
+    Q_ENUMS(TemperatureUnits)
 
     Q_PROPERTY(Fact* distanceUnits                      READ distanceUnits                      CONSTANT)
     Q_PROPERTY(Fact* areaUnits                          READ areaUnits                          CONSTANT)
     Q_PROPERTY(Fact* speedUnits                         READ speedUnits                         CONSTANT)
+    Q_PROPERTY(Fact* temperatureUnits                   READ temperatureUnits                   CONSTANT)
 
     Fact* distanceUnits                     (void);
     Fact* areaUnits                         (void);
     Fact* speedUnits                        (void);
+    Fact* temperatureUnits                  (void);
 
     static const char* unitsSettingsGroupName;
 
     static const char* distanceUnitsSettingsName;
     static const char* areaUnitsSettingsName;
     static const char* speedUnitsSettingsName;
+    static const char* temperatureUnitsSettingsName;
 
 private:
     SettingsFact* _distanceUnitsFact;
     SettingsFact* _areaUnitsFact;
     SettingsFact* _speedUnitsFact;
+    SettingsFact* _temperatureUnitsFact;
 };
 
 #endif

src/ui/preferences/GeneralSettings.qml

@@ -88,9 +88,9 @@ QGCView {
 
                         Repeater {
                             id:     unitsRepeater
-                            model:  [ QGroundControl.settingsManager.unitsSettings.distanceUnits, QGroundControl.settingsManager.unitsSettings.areaUnits, QGroundControl.settingsManager.unitsSettings.speedUnits ]
+                            model:  [ QGroundControl.settingsManager.unitsSettings.distanceUnits, QGroundControl.settingsManager.unitsSettings.areaUnits, QGroundControl.settingsManager.unitsSettings.speedUnits, QGroundControl.settingsManager.unitsSettings.temperatureUnits ]
 
-                            property var names: [ qsTr("Distance:"), qsTr("Area:"), qsTr("Speed:") ]
+                            property var names: [ qsTr("Distance:"), qsTr("Area:"), qsTr("Speed:"), qsTr("Temperature:") ]
 
                             Row {
                                 spacing:    ScreenTools.defaultFontPixelWidth