dsettingsbackend.h

// SPDX-FileCopyrightText: 2016 - 2022 UnionTech Software Technology Co., Ltd.
//
// SPDX-License-Identifier: LGPL-3.0-or-later
 
#pragma once
 
#include <QObject>
#include <QScopedPointer>
 
#include "dtkcore_global.h"
 
DCORE_BEGIN_NAMESPACE
 
class DSettings;
class LIBDTKCORESHARED_EXPORT DSettingsBackend : public QObject
{
    Q_OBJECT
public:
    explicit DSettingsBackend(QObject *parent = Q_NULLPTR): QObject(parent)
    {
        connect(this, &DSettingsBackend::sync, this, &DSettingsBackend::doSync, Qt::QueuedConnection);
        connect(this, &DSettingsBackend::setOption, this, &DSettingsBackend::doSetOption, Qt::QueuedConnection);
    }
    virtual ~DSettingsBackend() {}
 
    virtual QStringList keys() const = 0;
    virtual QVariant getOption(const QString &key) const = 0;
 
    virtual void doSync() = 0;
 
protected:
    virtual void doSetOption(const QString &key, const QVariant &value) = 0;
 
Q_SIGNALS:
    void optionChanged(const QString &key, const QVariant &value);
 
    // private signals;
Q_SIGNALS:
    void sync();
    void setOption(const QString &key, const QVariant &value);
};
 
DCORE_END_NAMESPACE