core: create qPrefLocationService from SettingsObjectWrapper

Update set/get functions to follow common name scheme:
- get function have same name as in struct prefs
- 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>

core/CMakeLists.txt

@@ -109,6 +109,7 @@ set(SUBSURFACE_CORE_LIB_SRCS
 	settings/qPrefDiveComputer.cpp
 	settings/qPrefDivePlanner.cpp
 	settings/qPrefFacebook.cpp
+	settings/qPrefLocationService.cpp
 	settings/qPrefPrivate.cpp
 	settings/qPrefProxy.cpp
 	settings/qPrefTechnicalDetails.cpp

core/settings/qPref.h

@@ -11,6 +11,7 @@
 #include "qPrefDiveComputer.h"
 #include "qPrefDivePlanner.h"
 #include "qPrefFacebook.h"
+#include "qPrefLocationService.h"
 #include "qPrefProxy.h"
 #include "qPrefTechnicalDetails.h"
 #include "qPrefUnit.h"

core/settings/qPrefLocationService.cpp

@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "qPrefLocationService.h"
+#include "qPref.h"
+#include "qPrefPrivate.h"
+
+static const QString group = QStringLiteral("LocationService");
+
+qPrefLocationService::qPrefLocationService(QObject *parent) : QObject(parent)
+{
+}
+qPrefLocationService *qPrefLocationService::instance()
+{
+	static qPrefLocationService *self = new qPrefLocationService;
+	return self;
+}
+
+void qPrefLocationService::loadSync(bool doSync)
+{
+	disk_distance_threshold(doSync);
+	disk_time_threshold(doSync);
+}
+
+HANDLE_PREFERENCE_INT(LocationService, "/distance_threshold", distance_threshold);
+
+HANDLE_PREFERENCE_INT(LocationService, "/time_threshold", time_threshold);

core/settings/qPrefLocationService.h

@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: GPL-2.0
+#ifndef QPREFLOCATIONSERVICE_H
+#define QPREFLOCATIONSERVICE_H
+#include "core/pref.h"
+
+#include <QObject>
+
+
+class qPrefLocationService : public QObject {
+	Q_OBJECT
+	Q_PROPERTY(int distance_threshold READ distance_threshold WRITE set_distance_threshold NOTIFY distance_threshold_changed);
+	Q_PROPERTY(int time_threshold READ time_threshold WRITE set_time_threshold NOTIFY time_threshold_changed);
+
+public:
+	qPrefLocationService(QObject *parent = NULL);
+	static qPrefLocationService *instance();
+
+	// Load/Sync local settings (disk) and struct preference
+	void loadSync(bool doSync);
+	void load() { loadSync(false); }
+	void sync() { loadSync(true); }
+
+public:
+	int distance_threshold() { return prefs.distance_threshold; }
+	int time_threshold() { return prefs.time_threshold; }
+
+public slots:
+	void set_distance_threshold(int value);
+	void set_time_threshold(int value);
+
+signals:
+	void distance_threshold_changed(int value);
+	void time_threshold_changed(int value);
+
+
+private:
+	void disk_distance_threshold(bool doSync);
+	void disk_time_threshold(bool doSync);
+};
+
+#endif

core/settings/qPrefPrivate.h

@@ -20,6 +20,7 @@ public:
 	friend class qPrefDiveComputer;
 	friend class qPrefDivePlanner;
 	friend class qPrefFacebook;
+	friend class qPrefLocationService;
 	friend class qPrefProxy;
 	friend class qPrefTechnicalDetails;
 	friend class qPrefUnits;

packaging/ios/Subsurface-mobile.pro

@@ -84,6 +84,7 @@ SOURCES += ../../subsurface-mobile-main.cpp \
 	../../core/settings/qPrefDiveComputer.cpp \
 	../../core/settings/qPrefDivePlanner.cpp \
 	../../core/settings/qPrefFacebook.cpp \
+	../../core/settings/qPrefLocationService.cpp \
 	../../core/settings/qPrefPrivate.cpp \
 	../../core/settings/qPrefProxy.cpp \
 	../../core/settings/qPrefTechnicalDetails.cpp \
@@ -202,6 +203,7 @@ HEADERS += \
 	../../core/settings/qPrefDiveComputer.h \
 	../../core/settings/qPrefDivePlanner.h \
 	../../core/settings/qPrefFacebook.h \
+	../../core/settings/qPrefLocationService.h \
 	../../core/settings/qPrefPrivate.h \
 	../../core/settings/qPrefProxy.h \
 	../../core/settings/qPrefTechnicalDetails.h \