129 lines
3.8 KiB
C++
129 lines
3.8 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 as
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* published by the Free Software Foundation; either version 2, or
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* (at your option) any later version.
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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 "datacontainer.h"
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#include "datacontainer_p.h"
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namespace Plasma
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{
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SignalRelay* DataContainerPrivate::signalRelay(const DataContainer* dc, QObject *visualization, uint pollingInterval, Plasma::IntervalAlignment align)
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{
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QMap<uint, SignalRelay *>::const_iterator relayIt = relays.find(pollingInterval);
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SignalRelay *relay = 0;
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//FIXME what if we have two applets with the same interval and different alignment?
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if (relayIt == relays.end()) {
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relay = new SignalRelay(const_cast<DataContainer*>(dc), this, pollingInterval, align);
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relays[pollingInterval] = relay;
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} else {
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relay = relayIt.value();
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}
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relayObjects[visualization] = relay;
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return relay;
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}
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bool DataContainerPrivate::hasUpdates()
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{
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if (cached) {
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// SignalRelay needs us to pretend we did an update
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cached = false;
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return true;
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}
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return dirty;
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}
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void SignalRelay::checkAlignment()
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{
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int newTime = 0;
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QTime t = QTime::currentTime();
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if (m_align == Plasma::AlignToMinute) {
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int seconds = t.second();
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if (seconds > 2) {
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newTime = ((60 - seconds) * 1000) + 500;
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}
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} else if (m_align == Plasma::AlignToHour) {
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int minutes = t.minute();
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int seconds = t.second();
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if (minutes > 1 || seconds > 10) {
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newTime = ((60 - minutes) * 1000 * 60) +
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((60 - seconds) * 1000) + 500;
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}
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}
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if (newTime) {
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killTimer(m_timerId);
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m_timerId = startTimer(newTime);
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m_resetTimer = true;
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}
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}
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void SignalRelay::checkQueueing()
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{
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if (m_queued) {
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emit dataUpdated(dc->objectName(), d->data);
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m_queued = false;
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//TODO: should we re-align our timer at this point, to avoid
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// constant queueing due to more-or-less constant time
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// async update time? this might make sense for
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// staggered accesses to the same source by multiple
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// visualizations causing a minimumPollingInterval violation.
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// it may not make sense for purely async-and-takes-a-while
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// type operations (e.g. network fetching).
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// we need more real world data before making such a change
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// change
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//
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// killTimer(m_timerId);
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// m_timerId = startTime(m_interval);
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}
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}
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void SignalRelay::timerEvent(QTimerEvent *event)
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{
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if (m_resetTimer) {
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killTimer(m_timerId);
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m_timerId = startTimer(m_interval);
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m_resetTimer = false;
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}
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if (m_align != Plasma::NoAlignment) {
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checkAlignment();
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}
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emit dc->updateRequested(dc);
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if (d->hasUpdates()) {
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//kDebug() << "emitting data updated directly" << d->data;
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emit dataUpdated(dc->objectName(), d->data);
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} else {
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// the source wasn't actually updated; so let's put ourselves in the queue
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// so we get an dataUpdated() when the data does arrive
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//kDebug() << "queued";
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m_queued = true;
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}
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event->accept();
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}
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} // Plasma namespace
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#include "datacontainer_p.moc"
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