source: psi/trunk/src/tools/idle/idle.cpp

/*
 * idle.cpp - detect desktop idle time
 * Copyright (C) 2003  Justin Karneges
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include"idle.h"

#include<qcursor.h>
#include<qdatetime.h>
#include<qtimer.h>

static IdlePlatform *platform = 0;
static int platform_ref = 0;

class Idle::Private
{
public:
        Private() {}

        QPoint lastMousePos;
        QDateTime idleSince;

        bool active;
        int idleTime;
        QDateTime startTime;
        QTimer checkTimer;
};

Idle::Idle()
{
        d = new Private;
        d->active = false;
        d->idleTime = 0;

        // try to use platform idle
        if(!platform) {
                IdlePlatform *p = new IdlePlatform;
                if(p->init())
                        platform = p;
                else
                        delete p;
        }
        if(platform)
                ++platform_ref;

        connect(&d->checkTimer, SIGNAL(timeout()), SLOT(doCheck()));
}

Idle::~Idle()
{
        if(platform) {
                --platform_ref;
                if(platform_ref == 0) {
                        delete platform;
                        platform = 0;
                }
        }
        delete d;
}

bool Idle::isActive() const
{
        return d->active;
}

bool Idle::usingPlatform() const
{
        return (platform ? true: false);
}

void Idle::start()
{
        d->startTime = QDateTime::currentDateTime();

        if(!platform) {
                // generic idle
                d->lastMousePos = QCursor::pos();
                d->idleSince = QDateTime::currentDateTime();
        }

        // poll every second (use a lower value if you need more accuracy)
        d->checkTimer.start(1000);
}

void Idle::stop()
{
        d->checkTimer.stop();
}

void Idle::doCheck()
{
        int i;
        if(platform)
                i = platform->secondsIdle();
        else {
                QPoint curMousePos = QCursor::pos();
                QDateTime curDateTime = QDateTime::currentDateTime();
                if(d->lastMousePos != curMousePos) {
                        d->lastMousePos = curMousePos;
                        d->idleSince = curDateTime;
                }
                i = d->idleSince.secsTo(curDateTime);
        }

        // set 'beginIdle' to the beginning of the idle time (by backtracking 'i' seconds from now)
        QDateTime beginIdle = QDateTime::currentDateTime().addSecs(-i);

        // set 't' to hold the number of seconds between 'beginIdle' and 'startTime'
        int t = beginIdle.secsTo(d->startTime);

        // beginIdle later than (or equal to) startTime?
        if(t <= 0) {
                // scoot ourselves up to the new idle start
                d->startTime = beginIdle;
        }
        // beginIdle earlier than startTime?
        else if(t > 0) {
                // do nothing
        }

        // how long have we been idle?
        int idleTime = d->startTime.secsTo(QDateTime::currentDateTime());

        secondsIdle(idleTime);
}