this is needed by clocks, as the obvious example, since "once a minute" isn't enough: it needs to be once a minute *on* the minute svn path=/trunk/KDE/kdebase/workspace/libs/plasma/; revision=711737
168 lines
5.1 KiB
C++
168 lines
5.1 KiB
C++
/*
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* Copyright 2006-2007 Aaron Seigo <aseigo@kde.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License version 2 as
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* published by the Free Software Foundation
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*
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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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*
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* You should have received a copy of the GNU Library General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "plasma.h"
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#include "datacontainer.h"
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#include "datacontainer_p.h"
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#include <QVariant>
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#include <KDebug>
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namespace Plasma
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{
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DataContainer::DataContainer(QObject* parent)
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: QObject(parent),
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d(new Private())
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{
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}
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DataContainer::~DataContainer()
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{
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delete d;
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}
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const DataEngine::Data DataContainer::data() const
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{
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return d->data;
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}
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void DataContainer::setData(const QString& key, const QVariant& value)
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{
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if (value.isNull() || !value.isValid()) {
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if (!d->data.contains(key)) {
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return;
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}
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d->data.remove(key);
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} else {
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d->data[key] = value;
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}
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d->dirty = true;
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}
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void DataContainer::clearData()
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{
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if (d->data.count() < 1) {
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// avoid an update if we don't have any data anyways
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return;
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}
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d->data.clear();
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d->dirty = true;
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}
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void DataContainer::checkForUpdate()
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{
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if (d->dirty) {
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emit updated(objectName(), d->data);
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d->dirty = false;
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}
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}
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void DataContainer::checkUsage()
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{
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if (d->relays.count() < 1 &&
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receivers(SIGNAL(updated(QString, Plasma::DataEngine::Data))) < 1) {
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// DO NOT CALL ANYTHING AFTER THIS LINE AS IT MAY GET DELETED!
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emit unused(objectName());
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}
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}
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void DataContainer::connectVisualization(QObject* visualization, uint updateInterval, Plasma::IntervalAlignment alignment)
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{
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// kDebug() << "connecting visualization" << (void*)visualization << "at interval of" << updateInterval;
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QMap<QObject *, SignalRelay *>::iterator objIt = d->relayObjects.find(visualization);
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bool connected = objIt != d->relayObjects.end();
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if (connected) {
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// this visualization is already connected. just adjust the update
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// frequency if necessary
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SignalRelay *relay = objIt.value();
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if (relay) {
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// connected to a relay
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disconnect(relay, SIGNAL(updated(QString,Plasma::DataEngine::Data)),
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visualization, SLOT(updated(QString,Plasma::DataEngine::Data)));
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if (relay->isUnused()) {
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d->relays.erase(d->relays.find(relay->m_interval));
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delete relay;
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}
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// kDebug() << " already connected, but to a relay";
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} else if (updateInterval < 1) {
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// the visualization was connected already, but not to a relay
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// and it still doesn't want to connect to a relay, so we have
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// nothing to do!
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kDebug() << " already connected, nothing to do";
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return;
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} else {
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disconnect(this, SIGNAL(updated(QString,Plasma::DataEngine::Data)),
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visualization, SLOT(updated(QString,Plasma::DataEngine::Data)));
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}
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}
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if (!connected) {
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connect(visualization, SIGNAL(destroyed(QObject*)),
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this, SLOT(disconnectVisualization(QObject*)), Qt::QueuedConnection);
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}
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d->relayObjects[visualization] = 0;
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if (updateInterval < 1) {
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// kDebug() << " connecting directly";
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connect(this, SIGNAL(updated(QString,Plasma::DataEngine::Data)),
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visualization, SLOT(updated(QString,Plasma::DataEngine::Data)));
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} else {
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// kDebug() << " connecting to a relay";
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connect(d->signalRelay(this, visualization, updateInterval, alignment),
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SIGNAL(updated(QString,Plasma::DataEngine::Data)),
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visualization, SLOT(updated(QString,Plasma::DataEngine::Data)));
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}
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}
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void DataContainer::disconnectVisualization(QObject* visualization)
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{
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QMap<QObject *, SignalRelay *>::iterator objIt = d->relayObjects.find(visualization);
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if (objIt == d->relayObjects.end() || !objIt.value()) {
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// it is connected directly to the DataContainer itself
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disconnect(this, SIGNAL(updated(QString,Plasma::DataEngine::Data)),
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visualization, SLOT(updated(QString,Plasma::DataEngine::Data)));
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} else {
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SignalRelay *relay = objIt.value();
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disconnect(relay, SIGNAL(updated(QString,Plasma::DataEngine::Data)),
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visualization, SLOT(updated(QString,Plasma::DataEngine::Data)));
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if (relay->isUnused()) {
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d->relays.erase(d->relays.find(relay->m_interval));
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delete relay;
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}
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}
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d->relayObjects.erase(objIt);
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checkUsage();
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}
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} // Plasma namespace
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#include "datacontainer.moc"
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#include "datacontainer_p.moc"
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