plasma-framework/datacontainer.cpp

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/*
* Copyright 2006-2007 Aaron Seigo <aseigo@kde.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License version 2 as
* published by the Free Software Foundation
*
* This program 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 General Public License for more details
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "datacontainer.h"
#include <QVariant>
#include <KDebug>
namespace Plasma
{
class DataContainer::Private
{
public:
Private()
: dirty(false)
{}
DataEngine::Data data;
int connectCount;
bool dirty : 1;
};
DataContainer::DataContainer(QObject* parent)
: QObject(parent),
d(new Private())
{
}
DataContainer::~DataContainer()
{
delete d;
}
const DataEngine::Data DataContainer::data() const
{
return d->data;
}
void DataContainer::setData(const QString& key, const QVariant& value)
{
if (value.isNull() || !value.isValid()) {
if (!d->data.contains(key)) {
return;
}
d->data.remove(key);
} else {
d->data[key] = value;
}
d->dirty = true;
}
void DataContainer::clearData()
{
if (d->data.count() < 1) {
// avoid an update if we don't have any data anyways
return;
}
d->data.clear();
d->dirty = true;
}
void DataContainer::checkForUpdate()
{
if (d->dirty) {
emit updated(objectName(), d->data);
d->dirty = false;
}
}
void DataContainer::connectNotify(const char *signal)
{
if (QLatin1String(signal) == QMetaObject::normalizedSignature(SIGNAL(updated(QString, Plasma::DataEngine::Data))).constData()) {
++d->connectCount;
}
}
void DataContainer::disconnectNotify(const char *signal)
{
if (QLatin1String(signal) == QMetaObject::normalizedSignature(SIGNAL(updated(QString, Plasma::DataEngine::Data))).constData()) {
if (d->connectCount > 0) {
--d->connectCount;
}
if (d->connectCount < 1) {
// DO NOT CALL ANYTHING AFTER THIS LINE AS IT MAY GET DELETED!
emit unused(objectName());
}
}
}
} // Plasma namespace
#include "datacontainer.moc"