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/usr/include/lxqt/pluginsettings.h is in lxqt-panel 0.11.1-1.

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/* BEGIN_COMMON_COPYRIGHT_HEADER
 * (c)LGPL2+
 *
 * LXQt - a lightweight, Qt based, desktop toolset
 * http://lxqt.org
 *
 * Copyright: 2015 LXQt team
 * Authors:
 *   Paulo Lieuthier <paulolieuthier@gmail.com>
 *
 * This program or library is free software; you can redistribute it
 * and/or modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General
 * Public License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA
 *
 * END_COMMON_COPYRIGHT_HEADER */

#ifndef PLUGIN_SETTINGS_H
#define PLUGIN_SETTINGS_H

#include <QObject>
#include <QString>
#include <QVariant>
#include "lxqtpanelglobals.h"

namespace LXQt
{
    class Settings;
}
class PluginSettingsFactory;
class PluginSettingsPrivate;

/*!
 * \brief
 * Settings for particular plugin. This object/class can be used similarly as \sa QSettings.
 * Object cannot be constructed direcly (it is the panel's responsibility to construct it for each plugin).
 *
 *
 * \note
 * We are relying here on so called "back linking" (calling a function defined in executable
 * back from an external library)...
 */
class LXQT_PANEL_API PluginSettings : public QObject
{
    Q_OBJECT

    //for instantiation
    friend class PluginSettingsFactory;

public:
    ~PluginSettings();

    QString group() const;

    QVariant value(const QString &key, const QVariant &defaultValue = QVariant()) const;
    void setValue(const QString &key, const QVariant &value);

    void remove(const QString &key);
    bool contains(const QString &key) const;

    QList<QMap<QString, QVariant> > readArray(const QString &prefix);
    void setArray(const QString &prefix, const QList<QMap<QString, QVariant> > &hashList);

    void clear();
    void sync();

    QStringList allKeys() const;
    QStringList childGroups() const;

    void beginGroup(const QString &subGroup);
    void endGroup();

    void loadFromCache();

signals:
    void settingsChanged();

private:
    explicit PluginSettings(LXQt::Settings *settings, const QString &group, QObject *parent = nullptr);

private:
    QScopedPointer<PluginSettingsPrivate> d_ptr;
    Q_DECLARE_PRIVATE(PluginSettings)
};

#endif