The new settings class: exploiting JSON and QMetaProperties

settings.cpp

#include "settings.h"

#include <QFile>
#include <QVariantMap>
#include <QJsonDocument>
#include <QMetaProperty>

#include "util.h"

Settings::Settings(QObject *parent):
    QObject(parent)
{

}

void Settings::LoadSettings()
{
    QFile f(Util::SettingsLocation());
    if(f.open(QIODevice::ReadOnly | QIODevice::Text))
    {
        QVariantMap settings = QJsonDocument::fromJson(f.readAll()).toVariant().toMap();
        f.close();
        for(QVariantMap::iterator setting = settings.begin(); setting != settings.end(); setting++)
            setProperty(setting.key().toUtf8(), setting.value());
    }
}

void Settings::SaveSettings()
{
    QObject *obj; // todo
    QFile f(Util::SettingsLocation());
    if(f.open(QFile::WriteOnly | QFile::Truncate | QIODevice::Text))
    {
        f.write(QJsonDocument::fromVariant(UserPropertyMap(obj)).toJson());
        f.close();
    }
}

QVariantMap Settings::UserPropertyMap(QObject *obj)
{
    QVariantMap properties;
    const QMetaObject *mobj = obj->metaObject();
    for(int i = mobj->propertyCount()-1; i >= 0; --i)
    {
        QMetaProperty mprop = mobj->property(i);
        const char *name = mprop.name();
        if(mprop.isUser())
            properties[name] = obj->property(name);
    }
    return properties;
}