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/*
* synchtimer.cpp - timers which synchronise to time boundaries
* Program: kalarm
* Copyright (C) 2004, 2005 by David Jarvie <software@astrojar.org.uk>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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 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 "kalarm.h"
#include <qtimer.h>
#include <kdebug.h>
#include "synchtimer.moc"
/*=============================================================================
= Class: SynchTimer
= Virtual base class for application-wide timer synchronised to a time boundary.
=============================================================================*/
SynchTimer::SynchTimer()
{
mTimer = new QTimer(this, "mTimer");
}
SynchTimer::~SynchTimer()
{
delete mTimer;
mTimer = 0;
}
/******************************************************************************
* Connect to the timer. The timer is started if necessary.
*/
void SynchTimer::connecT(QObject* receiver, const char* member)
{
Connection connection(receiver, member);
if (mConnections.find(connection) != mConnections.end())
return; // the slot is already connected, so ignore request
connect(mTimer, SIGNAL(timeout()), receiver, member);
mConnections.append(connection);
if (!mTimer->isActive())
{
connect(mTimer, SIGNAL(timeout()), this, SLOT(slotTimer()));
start();
}
}
/******************************************************************************
* Disconnect from the timer. The timer is stopped if no longer needed.
*/
void SynchTimer::disconnecT(QObject* receiver, const char* member)
{
if (mTimer)
{
mTimer->disconnect(receiver, member);
if (member)
mConnections.remove(Connection(receiver, member));
else
{
for (QValueList<Connection>::Iterator it = mConnections.begin(); it != mConnections.end(); )
{
if ((*it).receiver == receiver)
it = mConnections.remove(it);
else
++it;
}
}
if (mConnections.isEmpty())
{
mTimer->disconnect();
mTimer->stop();
}
}
}
/*=============================================================================
= Class: MinuteTimer
= Application-wide timer synchronised to the minute boundary.
=============================================================================*/
MinuteTimer* MinuteTimer::mInstance = 0;
MinuteTimer* MinuteTimer::instance()
{
if (!mInstance)
mInstance = new MinuteTimer;
return mInstance;
}
/******************************************************************************
* Called when the timer triggers, or to start the timer.
* Timers can under some circumstances wander off from the correct trigger time,
* so rather than setting a 1 minute interval, calculate the correct next
* interval each time it triggers.
*/
void MinuteTimer::slotTimer()
{
kdDebug(5950) << "MinuteTimer::slotTimer()" << endl;
int interval = 62 - QTime::currentTime().second();
mTimer->start(interval * 1000, true); // execute a single shot
}
/*=============================================================================
= Class: DailyTimer
= Application-wide timer synchronised to midnight.
=============================================================================*/
QValueList<DailyTimer*> DailyTimer::mFixedTimers;
DailyTimer::DailyTimer(const QTime& timeOfDay, bool fixed)
: mTime(timeOfDay),
mFixed(fixed)
{
if (fixed)
mFixedTimers.append(this);
}
DailyTimer::~DailyTimer()
{
if (mFixed)
mFixedTimers.remove(this);
}
DailyTimer* DailyTimer::fixedInstance(const QTime& timeOfDay, bool create)
{
for (QValueList<DailyTimer*>::Iterator it = mFixedTimers.begin(); it != mFixedTimers.end(); ++it)
if ((*it)->mTime == timeOfDay)
return *it;
return create ? new DailyTimer(timeOfDay, true) : 0;
}
/******************************************************************************
* Disconnect from the timer signal which triggers at the given fixed time of day.
* If there are no remaining connections to that timer, it is destroyed.
*/
void DailyTimer::disconnect(const QTime& timeOfDay, QObject* receiver, const char* member)
{
DailyTimer* timer = fixedInstance(timeOfDay, false);
if (!timer)
return;
timer->disconnecT(receiver, member);
if (!timer->hasConnections())
delete timer;
}
/******************************************************************************
* Change the time at which the variable timer triggers.
*/
void DailyTimer::changeTime(const QTime& newTimeOfDay, bool triggerMissed)
{
if (mFixed)
return;
if (mTimer->isActive())
{
mTimer->stop();
bool triggerNow = false;
if (triggerMissed)
{
QTime now = QTime::currentTime();
if (now >= newTimeOfDay && now < mTime)
{
// The trigger time is now earlier and it has already arrived today.
// Trigger a timer event immediately.
triggerNow = true;
}
}
mTime = newTimeOfDay;
if (triggerNow)
mTimer->start(0, true); // trigger immediately
else
start();
}
else
mTime = newTimeOfDay;
}
/******************************************************************************
* Initialise the timer to trigger at the specified time.
* This will either be today or tomorrow, depending on whether the trigger time
* has already passed.
*/
void DailyTimer::start()
{
// TIMEZONE = local time
QDateTime now = QDateTime::currentDateTime();
// Find out whether to trigger today or tomorrow.
// In preference, use the last trigger date to determine this, since
// that will avoid possible errors due to daylight savings time changes.
bool today;
if (mLastDate.isValid())
today = (mLastDate < now.date());
else
today = (now.time() < mTime);
QDateTime next;
if (today)
next = QDateTime(now.date(), mTime);
else
next = QDateTime(now.date().addDays(1), mTime);
uint interval = next.toTime_t() - now.toTime_t();
mTimer->start(interval * 1000, true); // execute a single shot
kdDebug(5950) << "DailyTimer::start(at " << mTime.hour() << ":" << mTime.minute() << "): interval = " << interval/3600 << ":" << (interval/60)%60 << ":" << interval%60 << endl;
}
/******************************************************************************
* Called when the timer triggers.
* Set the timer to trigger again tomorrow at the specified time.
* Note that if daylight savings time changes occur, this will not be 24 hours
* from now.
*/
void DailyTimer::slotTimer()
{
// TIMEZONE = local time
QDateTime now = QDateTime::currentDateTime();
mLastDate = now.date();
QDateTime next = QDateTime(mLastDate.addDays(1), mTime);
uint interval = next.toTime_t() - now.toTime_t();
mTimer->start(interval * 1000, true); // execute a single shot
kdDebug(5950) << "DailyTimer::slotTimer(at " << mTime.hour() << ":" << mTime.minute() << "): interval = " << interval/3600 << ":" << (interval/60)%60 << ":" << interval%60 << endl;
}
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