/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the examples of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:BSD$

** You may use this file under the terms of the BSD license as follows:

**

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** modification, are permitted provided that the following conditions are

** met:

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**     notice, this list of conditions and the following disclaimer.

**   * Redistributions in binary form must reproduce the above copyright

**     notice, this list of conditions and the following disclaimer in

**     the documentation and/or other materials provided with the

**     distribution.

**   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor

**     the names of its contributors may be used to endorse or promote

**     products derived from this software without specific prior written

**     permission.

**

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****************************************************************************/

#include <QtDeclarative/QDeclarativeExtensionPlugin>

#include <QtDeclarative/qdeclarative.h>

#include <qdebug.h>

#include <qdatetime.h>

#include <qbasictimer.h>

#include <qapplication.h>

// Implements a "TimeModel" class with hour and minute properties

// that change on-the-minute yet efficiently sleep the rest

// of the time.

class MinuteTimer : public QObject

{

    Q_OBJECT

public:

    MinuteTimer(QObject *parent) : QObject(parent)

    {

    }

    void start()

    {

        if (!timer.isActive()) {

            time = QTime::currentTime();

            timer.start(60000-time.second()*1000, this);

        }

    }

    void stop()

    {

        timer.stop();

    }

    int hour() const { return time.hour(); }

    int minute() const { return time.minute(); }

signals:

    void timeChanged();

protected:

    void timerEvent(QTimerEvent *)

    {

        QTime now = QTime::currentTime();

        if (now.second() == 59 && now.minute() == time.minute() && now.hour() == time.hour()) {

            // just missed time tick over, force it, wait extra 0.5 seconds

            time.addSecs(60);

            timer.start(60500, this);

        } else {

            time = now;

            timer.start(60000-time.second()*1000, this);

        }

        emit timeChanged();

    }

private:

    QTime time;

    QBasicTimer timer;

};

class TimeModel : public QObject

{

    Q_OBJECT

    Q_PROPERTY(int hour READ hour NOTIFY timeChanged)

    Q_PROPERTY(int minute READ minute NOTIFY timeChanged)

public:

    TimeModel(QObject *parent=0) : QObject(parent)

    {

        if (++instances == 1) {

            if (!timer)

                timer = new MinuteTimer(qApp);

            connect(timer, SIGNAL(timeChanged()), this, SIGNAL(timeChanged()));

            timer->start();

        }

    }

    ~TimeModel()

    {

        if (--instances == 0) {

            timer->stop();

        }

    }

    int minute() const { return timer->minute(); }

    int hour() const { return timer->hour(); }

signals:

    void timeChanged();

private:

    QTime t;

    static MinuteTimer *timer;

    static int instances;

};

int TimeModel::instances=0;

MinuteTimer *TimeModel::timer=0;

class QExampleQmlPlugin : public QDeclarativeExtensionPlugin

{

    Q_OBJECT

public:

    void registerTypes(const char *uri)

    {

        Q_ASSERT(uri == QLatin1String("com.nokia.TimeExample"));

        qmlRegisterType<TimeModel>(uri, 1, 0, "Time");

    }

};

#include "plugin.moc"