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keithel/main.cpp snippet

Created January 12, 2017 14:33
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Unqlite Key Value Store QML wrapper
Raw
main.cpp snippet
qmlRegisterType<UnqliteStore>("com.l3.demo", 1, 0, "KeyValueStore");
Raw
qml snippet
KeyValueStore {
id: keyValueStore
source: "demo.db"
property alias fpsVisible: fpsLabel.visible
property alias rollIndicatorVisible: rollIndicator.visible
onFpsVisibleChanged: console.log("fpsVisible: " + fpsVisible.toLocaleString())
}
Raw
unqlitestore.cpp
#include "unqlitestore.h"
#include <QEvent>
#include <QVariant>
#include <QTimer>
#include <QMetaProperty>
#include <QDebug>
UnqliteStore::UnqliteStore(QObject *parent)
: QObject(parent)
{
m_timer = new QTimer(this);
connect(m_timer, &QTimer::timeout, [this]{
const QMetaObject* metaObject = this->metaObject();
QStringList properties;
for(int i = metaObject->propertyOffset(); i < metaObject->propertyCount(); ++i)
properties << QString::fromLatin1(metaObject->property(i).name());
qDebug() << properties;
});
m_timer->setSingleShot(true);
m_timer->start(2000);
}
UnqliteStore::~UnqliteStore()
{
unqlite_close(m_db);
}
void UnqliteStore::setSource(const QString &source)
{
int ret;
if (!m_dbSource.isEmpty())
{
ret = unqlite_close(m_db);
Q_ASSERT(ret == UNQLITE_OK);
}
m_dbSource = source;
ret = unqlite_open(&m_db, m_dbSource.toLocal8Bit().constData(), UNQLITE_OPEN_CREATE | UNQLITE_OPEN_MMAP);
Q_ASSERT(ret == UNQLITE_OK);
emit sourceChanged();
}
bool UnqliteStore::event(QEvent *event)
{
if (event->type() != QEvent::DynamicPropertyChange)
return QObject::event(event);
QDynamicPropertyChangeEvent* dpcEvent = (QDynamicPropertyChangeEvent*)event;
QByteArray propName = dpcEvent->propertyName();
if (propName == "source")
return QObject::event(event);
QVariant propValue = this->property(dpcEvent->propertyName());
store(propName, this->property(propName));
return QObject::event(event);
}
bool UnqliteStore::store(const QString &key, const QVariant &value)
{
QByteArray valueBA(value.toByteArray());
int ret = unqlite_kv_store(m_db, qPrintable(key), key.toLocal8Bit().length(), valueBA.constData(), valueBA.length());
Q_ASSERT(ret == UNQLITE_OK);
return ret == UNQLITE_OK;
}
Raw
unqlitestore.h
#ifndef UNQLITESTORE_H
#define UNQLITESTORE_H
#include <QObject>
extern "C" {
#include <unqlite.h>
}
class QTimer;
class UnqliteStore : public QObject
{
Q_OBJECT
Q_PROPERTY(QString source READ source WRITE setSource NOTIFY sourceChanged)
public:
explicit UnqliteStore(QObject *parent = 0);
~UnqliteStore();
inline QString source() { return m_dbSource; }
void setSource(const QString& source);
virtual bool event(QEvent *event) override;
Q_INVOKABLE bool store(const QString& key, const QVariant& value);
signals:
void sourceChanged();
private:
unqlite* m_db = nullptr;
QString m_dbSource;
QTimer* m_timer;
};
#endif // UNQLITESTORE_H
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