core: create qPrefUnit from SettingsObjectWrapper

Update set/get functions to follow common name scheme:
- get function have same name as in struct diveComputer
- set function have set_<name>
- signal function have <name>_changed

one class one .h/.cpp is the C++ idiom. Having load/sync of each
variable in 1 functions (in contrast to the distributed way
SettingsObjectWrapper handles it) secures the same storage name
is used. Having the set/get/load/sync functions grouped together
makes it easier to get an overview.

REMARK: this commit only defines the class, it is not active in production

Signed-off-by: Jan Iversen <jani@apache.org>

1 files changed, 75 insertions, 0 deletions

diff --git a/core/settings/qPrefUnit.cpp b/core/settings/qPrefUnit.cpp
new file mode 100644
index 000000000..b0b45a881
--- /dev/null
+++ b/core/settings/qPrefUnit.cpp
@@ -0,0 +1,75 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "qPref.h"
+#include "qPrefPrivate.h"
+
+
+static const QString group = QStringLiteral("Units");
+
+qPrefUnits::qPrefUnits(QObject *parent) : QObject(parent)
+{
+}
+qPrefUnits *qPrefUnits::instance()
+{
+	static qPrefUnits *self = new qPrefUnits;
+	return self;
+}
+
+
+void qPrefUnits::loadSync(bool doSync)
+{
+	disk_coordinates_traditional(doSync);
+	disk_duration_units(doSync);
+	disk_length(doSync);
+	disk_pressure(doSync);
+	disk_show_units_table(doSync);
+	disk_temperature(doSync);
+	disk_unit_system(doSync);
+	disk_vertical_speed_time(doSync);
+	disk_volume(doSync);
+	disk_weight(doSync);
+}
+
+HANDLE_PREFERENCE_BOOL(Units, "/coordinates", coordinates_traditional);
+
+HANDLE_PREFERENCE_ENUM_EXT(Units, units::DURATION, "/duration_units", duration_units, units.);
+
+HANDLE_PREFERENCE_ENUM_EXT(Units, units::LENGTH, "/length", length, units.);
+
+HANDLE_PREFERENCE_ENUM_EXT(Units, units::PRESSURE, "/pressure", pressure, units.);
+
+HANDLE_PREFERENCE_BOOL_EXT(Units, "/show_units_table", show_units_table, units.);
+
+HANDLE_PREFERENCE_ENUM_EXT(Units, units::TEMPERATURE, "/temperature", temperature, units.);
+
+QString qPrefUnits::unit_system()
+{
+	return 	prefs.unit_system == METRIC ? QStringLiteral("metric") :
+			prefs.unit_system == IMPERIAL ? QStringLiteral("imperial") :
+											QStringLiteral("personalized");
+}
+void qPrefUnits::set_unit_system(const QString& value)
+{
+	short int v = value == QStringLiteral("metric") ? METRIC :
+					value == QStringLiteral("imperial")? IMPERIAL :
+							PERSONALIZE;
+	if (v != prefs.unit_system) {
+		if (v == METRIC) {
+			prefs.unit_system = METRIC;
+			prefs.units = SI_units;
+		} else if (v == IMPERIAL) {
+			prefs.unit_system = IMPERIAL;
+			prefs.units = IMPERIAL_units;
+		} else {
+			prefs.unit_system = PERSONALIZE;
+		}
+		disk_unit_system(true);
+		emit unit_system_changed(value);
+	}
+}
+DISK_LOADSYNC_ENUM(Units, "/unit_system", unit_system_values, unit_system);
+
+HANDLE_PREFERENCE_ENUM_EXT(Units, units::TIME, "/vertical_speed_time", vertical_speed_time, units.);
+
+HANDLE_PREFERENCE_ENUM_EXT(Units, units::VOLUME, "/volume", volume, units.);
+
+HANDLE_PREFERENCE_ENUM_EXT(Units, units::WEIGHT, "/weight", weight, units.);