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#include <QtCore>

#include <QtGui>

class Digits: public QWidget

{

    Q_OBJECT

public:

    enum {

        Slide,

        Flip,

        Rotate

    };

    Digits(QWidget *parent)

        : QWidget(parent)

        , m_number(0)

        , m_transition(Slide)

    {

        setAttribute(Qt::WA_OpaquePaintEvent, true);

        setAttribute(Qt::WA_NoSystemBackground, true);

        connect(&m_animator, SIGNAL(frameChanged(int)), SLOT(update()));

        m_animator.setFrameRange(0, 100);

        m_animator.setDuration(600);

        m_animator.setCurveShape(QTimeLine::EaseInOutCurve);

    }

    void setTransition(int tr) {

        m_transition = tr;

    }

    int transition() const {

        return m_transition;

    }

    void setNumber(int n) {

        if (m_number != n) {

            m_number = qBound(0, n, 99);

            preparePixmap();

            update();

        }

    }

    void flipTo(int n) {

        if (m_number != n) {

            m_number = qBound(0, n, 99);

            m_lastPixmap = m_pixmap;

            preparePixmap();

            m_animator.stop();

            m_animator.start();

        }

    }

protected:

    void drawFrame(QPainter *p, const QRect &rect) {

        p->setPen(Qt::NoPen);

        QLinearGradient gradient(rect.topLeft(), rect.bottomLeft());

        gradient.setColorAt(0.00, QColor(245, 245, 245));

        gradient.setColorAt(0.49, QColor(192, 192, 192));

        gradient.setColorAt(0.51, QColor(245, 245, 245));

        gradient.setColorAt(1.00, QColor(192, 192, 192));

        p->setBrush(gradient);

        QRect r = rect;

        p->drawRoundedRect(r, 15, 15, Qt::RelativeSize);

        r.adjust(1, 4, -1, -4);

        p->setPen(QColor(181, 181, 181));

        p->setBrush(Qt::NoBrush);

        p->drawRoundedRect(r, 15, 15, Qt::RelativeSize);

        p->setPen(QColor(159, 159, 159));

        int y = rect.top() + rect.height() / 2 - 1;

        p->drawLine(rect.left(), y, rect.right(), y);

    }

    QPixmap drawDigits(int n, const QRect &rect) {

        int scaleFactor = 2;

#if defined(Q_OS_SYMBIAN) || defined(Q_OS_WINCE_WM)

        if (rect.height() > 240)

            scaleFactor = 1;

#endif

        QString str = QString::number(n);

        if (str.length() == 1)

            str.prepend("0");

        QFont font;

        font.setFamily("Helvetica");

        int fontHeight = scaleFactor * 0.55 * rect.height();

        font.setPixelSize(fontHeight);

        font.setBold(true);

        QPixmap pixmap(rect.size() * scaleFactor);

        pixmap.fill(Qt::transparent);

        QLinearGradient gradient(QPoint(0, 0), QPoint(0, pixmap.height()));

        gradient.setColorAt(0.00, QColor(128, 128, 128));

        gradient.setColorAt(0.49, QColor(64, 64, 64));

        gradient.setColorAt(0.51, QColor(128, 128, 128));

        gradient.setColorAt(1.00, QColor(16, 16, 16));

        QPainter p;

        p.begin(&pixmap);

        p.setFont(font);

        QPen pen;

        pen.setBrush(QBrush(gradient));

        p.setPen(pen);

        p.drawText(pixmap.rect(), Qt::AlignCenter, str);

        p.end();

        return pixmap.scaledToWidth(width(), Qt::SmoothTransformation);

    }

    void preparePixmap() {

        m_pixmap = QPixmap(size());

        m_pixmap.fill(Qt::transparent);

        QPainter p;

        p.begin(&m_pixmap);

        p.drawPixmap(0, 0, drawDigits(m_number, rect()));

        p.end();

    }

    void resizeEvent(QResizeEvent*) {

        preparePixmap();

        update();

    }

    void paintStatic() {

        QPainter p(this);

        p.fillRect(rect(), Qt::black);

        int pad = width() / 10;

        drawFrame(&p, rect().adjusted(pad, pad, -pad, -pad));

        p.drawPixmap(0, 0, m_pixmap);

    }

    void paintSlide() {

        QPainter p(this);

        p.fillRect(rect(), Qt::black);

        int pad = width() / 10;

        QRect fr = rect().adjusted(pad, pad, -pad, -pad);

        drawFrame(&p, fr);

        p.setClipRect(fr);

        int y = height() * m_animator.currentFrame() / 100;

        p.drawPixmap(0, y, m_lastPixmap);

        p.drawPixmap(0, y - height(), m_pixmap);

    }

    void paintFlip() {

        QPainter p(this);

#if !defined(Q_OS_SYMBIAN) && !defined(Q_OS_WINCE_WM)

        p.setRenderHint(QPainter::SmoothPixmapTransform, true);

        p.setRenderHint(QPainter::Antialiasing, true);

#endif

        p.fillRect(rect(), Qt::black);

        int hw = width() / 2;

        int hh = height() / 2;

        // behind is the new pixmap

        int pad = width() / 10;

        QRect fr = rect().adjusted(pad, pad, -pad, -pad);

        drawFrame(&p, fr);

        p.drawPixmap(0, 0, m_pixmap);

        int index = m_animator.currentFrame();

        if (index <= 50) {

            // the top part of the old pixmap is flipping

            int angle = -180 * index / 100;

            QTransform transform;

            transform.translate(hw, hh);

            transform.rotate(angle, Qt::XAxis);

            p.setTransform(transform);

            drawFrame(&p, fr.adjusted(-hw, -hh, -hw, -hh));

            p.drawPixmap(-hw, -hh, m_lastPixmap);

            // the bottom part is still the old pixmap

            p.resetTransform();

            p.setClipRect(0, hh, width(), hh);

            drawFrame(&p, fr);

            p.drawPixmap(0, 0, m_lastPixmap);

        } else {

            p.setClipRect(0, hh, width(), hh);

            // the bottom part is still the old pixmap

            drawFrame(&p, fr);

            p.drawPixmap(0, 0, m_lastPixmap);

            // the bottom part of the new pixmap is flipping

            int angle = 180 - 180 * m_animator.currentFrame() / 100;

            QTransform transform;

            transform.translate(hw, hh);

            transform.rotate(angle, Qt::XAxis);

            p.setTransform(transform);

            drawFrame(&p, fr.adjusted(-hw, -hh, -hw, -hh));

            p.drawPixmap(-hw, -hh, m_pixmap);

        }

    }

    void paintRotate() {

        QPainter p(this);

        int pad = width() / 10;

        QRect fr = rect().adjusted(pad, pad, -pad, -pad);

        drawFrame(&p, fr);

        p.setClipRect(fr);

        int angle1 = -180 * m_animator.currentFrame() / 100;

        int angle2 = 180 - 180 * m_animator.currentFrame() / 100;

        int angle = (m_animator.currentFrame() <= 50) ? angle1 : angle2;

        QPixmap pix = (m_animator.currentFrame() <= 50) ? m_lastPixmap : m_pixmap;

        QTransform transform;

        transform.translate(width() / 2, height() / 2);

        transform.rotate(angle, Qt::XAxis);

        p.setTransform(transform);

        p.setRenderHint(QPainter::SmoothPixmapTransform, true);

        p.drawPixmap(-width() / 2, -height() / 2, pix);

    }

    void paintEvent(QPaintEvent *event) {

        Q_UNUSED(event);

        if (m_animator.state() == QTimeLine::Running) {

            if (m_transition == Slide)

                paintSlide();

            if (m_transition == Flip)

                paintFlip();

            if (m_transition == Rotate)

                paintRotate();

        } else {

            paintStatic();

        }

    }

private:

    int m_number;

    int m_transition;

    QPixmap m_pixmap;

    QPixmap m_lastPixmap;

    QTimeLine m_animator;

};

class DigiFlip : public QMainWindow

{

    Q_OBJECT

public:

    DigiFlip(QWidget *parent = 0)

        : QMainWindow(parent)

    {

        m_hour = new Digits(this);

        m_hour->show();

        m_minute = new Digits(this);

        m_minute->show();

        QPalette pal = palette();

        pal.setColor(QPalette::Window, Qt::black);

        setPalette(pal);

        m_ticker.start(1000, this);

        QTime t = QTime::currentTime();

        m_hour->setNumber(t.hour());

        m_minute->setNumber(t.minute());

        updateTime();

        QAction *slideAction = new QAction("&Slide", this);

        QAction *flipAction = new QAction("&Flip", this);

        QAction *rotateAction = new QAction("&Rotate", this);

        connect(slideAction, SIGNAL(triggered()), SLOT(chooseSlide()));

        connect(flipAction, SIGNAL(triggered()), SLOT(chooseFlip()));

        connect(rotateAction, SIGNAL(triggered()), SLOT(chooseRotate()));

#if defined(Q_OS_SYMBIAN) || defined(Q_OS_WINCE_WM)

        menuBar()->addAction(slideAction);

        menuBar()->addAction(flipAction);

        menuBar()->addAction(rotateAction);

#else

        addAction(slideAction);

        addAction(flipAction);

        addAction(rotateAction);

        setContextMenuPolicy(Qt::ActionsContextMenu);

#endif

    }

    void updateTime() {

        QTime t = QTime::currentTime();

        m_hour->flipTo(t.hour());

        m_minute->flipTo(t.minute());

        QString str = t.toString("hh:mm:ss");

        str.prepend(": ");

        if (m_hour->transition() == Digits::Slide)

            str.prepend("Slide");

        if (m_hour->transition() == Digits::Flip)

            str.prepend("Flip");

        if (m_hour->transition() == Digits::Rotate)

            str.prepend("Rotate");

        setWindowTitle(str);

    }

    void switchTransition(int delta) {

        int i = (m_hour->transition() + delta + 3) % 3;

        m_hour->setTransition(i);

        m_minute->setTransition(i);

        updateTime();

    }

protected:

    void resizeEvent(QResizeEvent*) {

        int digitsWidth = width() / 2;

        int digitsHeight = digitsWidth * 1.2;

        int y = (height() - digitsHeight) / 3;

        m_hour->resize(digitsWidth, digitsHeight);

        m_hour->move(0, y);

        m_minute->resize(digitsWidth, digitsHeight);

        m_minute->move(width() / 2, y);

    }

    void timerEvent(QTimerEvent*) {

        updateTime();

    }

    void keyPressEvent(QKeyEvent *event) {

        if (event->key() == Qt::Key_Right) {

            switchTransition(1);

            event->accept();

        }

        if (event->key() == Qt::Key_Left) {

            switchTransition(-1);

            event->accept();

        }

    }

private slots:

    void chooseSlide() {

        m_hour->setTransition(0);

        m_minute->setTransition(0);

        updateTime();

    }

    void chooseFlip() {

        m_hour->setTransition(1);

        m_minute->setTransition(1);

        updateTime();

    }

    void chooseRotate() {

        m_hour->setTransition(2);

        m_minute->setTransition(2);

        updateTime();

    }

private:

    QBasicTimer m_ticker;

    Digits *m_hour;

    Digits *m_minute;

};

#include "digiflip.moc"

int main(int argc, char *argv[])

{

    QApplication app(argc, argv);

    DigiFlip time;

#if defined(Q_OS_SYMBIAN) || defined(Q_OS_WINCE_WM)

    time.showMaximized();

#else

    time.resize(320, 240);

    time.show();

#endif

    return app.exec();

}