74 lines
2.4 KiB
C
74 lines
2.4 KiB
C
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/*
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Gwenview: an image viewer
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Copyright 2018 Friedrich W. H. Kossebau <kossebau@kde.org>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef DBUSABSTRACTADAPTOR_H
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#define DBUSABSTRACTADAPTOR_H
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// Qt
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#include <QDBusAbstractAdaptor>
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#include <QVariantMap>
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namespace Gwenview
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{
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/**
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* Extension of QDBusAbstractAdaptor for proper signalling of D-Bus object property changes
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*
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* QDBusAbstractAdaptor seems to fail on mapping QObject properties
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* to D-Bus object properties when it comes to signalling changes to a property.
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* The NOTIFY entry of Q_PROPERTY is not turned into respective D-Bus signalling of a
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* property change. So we have to do this explicitly ourselves, instead of using a normal
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* QObject signal and expecting the adaptor to translate it.
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*
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* To reduce D-Bus traffic, all registered property changes are accumulated and squashed
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* between event loops where then the D-Bus signal is emitted.
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*/
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class DBusAbstractAdaptor : public QDBusAbstractAdaptor
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{
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Q_OBJECT
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public:
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/**
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* Ideally we could query the D-Bus path of the object when used, but no idea yet how to do that.
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* So one has to additionally pass here the D-Bus path at which the object is registered
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* for which this interface is added.
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*
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* @param objectDBusPath D-Bus name of the property
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* @param parent memory management parent or nullptr
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*/
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explicit DBusAbstractAdaptor(const QString &objectDBusPath, QObject *parent);
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protected:
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/**
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* @param propertyName D-Bus name of the property
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* @param value the new value of the property
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*/
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void signalPropertyChange(const QString &propertyName, const QVariant &value);
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private Q_SLOTS:
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void emitPropertiesChangeDBusSignal();
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private:
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QVariantMap mChangedProperties;
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const QString mObjectPath;
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};
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}
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#endif // DBUSABSTRACTADAPTOR_H
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