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

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#include <QtGui>

#include <QtCore/qstate.h>

class Pixmap : public QObject, public QGraphicsPixmapItem

{

    Q_OBJECT

    Q_PROPERTY(QPointF pos READ pos WRITE setPos)

public:

    Pixmap(const QPixmap &pix)

        : QObject(), QGraphicsPixmapItem(pix)

    {

        setCacheMode(DeviceCoordinateCache);

    }

};

class Button : public QGraphicsWidget

{

    Q_OBJECT

public:

    Button(const QPixmap &pixmap, QGraphicsItem *parent = 0)

        : QGraphicsWidget(parent), _pix(pixmap)

    {

        setAcceptHoverEvents(true);

        setCacheMode(DeviceCoordinateCache);

    }

    QRectF boundingRect() const

    {

        return QRectF(-65, -65, 130, 130);

    }

    QPainterPath shape() const

    {

        QPainterPath path;

        path.addEllipse(boundingRect());

        return path;

    }

    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *)

    {

        bool down = option->state & QStyle::State_Sunken;

        QRectF r = boundingRect();

        QLinearGradient grad(r.topLeft(), r.bottomRight());

        grad.setColorAt(down ? 1 : 0, option->state & QStyle::State_MouseOver ? Qt::white : Qt::lightGray);

        grad.setColorAt(down ? 0 : 1, Qt::darkGray);

        painter->setPen(Qt::darkGray);

        painter->setBrush(grad);

        painter->drawEllipse(r);

        QLinearGradient grad2(r.topLeft(), r.bottomRight());

        grad.setColorAt(down ? 1 : 0, Qt::darkGray);

        grad.setColorAt(down ? 0 : 1, Qt::lightGray);

        painter->setPen(Qt::NoPen);

        painter->setBrush(grad);

        if (down)

            painter->translate(2, 2);

        painter->drawEllipse(r.adjusted(5, 5, -5, -5));

        painter->drawPixmap(-_pix.width()/2, -_pix.height()/2, _pix);

    }

signals:

    void pressed();

protected:

    void mousePressEvent(QGraphicsSceneMouseEvent *)

    {

        emit pressed();

        update();

    }

    void mouseReleaseEvent(QGraphicsSceneMouseEvent *)

    {

        update();

    }

private:

    QPixmap _pix;

};

class View : public QGraphicsView

{

public:

    View(QGraphicsScene *scene) : QGraphicsView(scene) { }

protected:

    void resizeEvent(QResizeEvent *event)

    {

        QGraphicsView::resizeEvent(event);

        fitInView(sceneRect(), Qt::KeepAspectRatio);

    }

};

int main(int argc, char **argv)

{

    Q_INIT_RESOURCE(animatedtiles);

    QApplication app(argc, argv);

    QPixmap kineticPix(":/images/kinetic.png");

    QPixmap bgPix(":/images/Time-For-Lunch-2.jpg");

    QGraphicsScene scene(-350, -350, 700, 700);

    QList<Pixmap *> items;

    for (int i = 0; i < 64; ++i) {

        Pixmap *item = new Pixmap(kineticPix);

        item->setOffset(-kineticPix.width()/2, -kineticPix.height()/2);

        item->setZValue(i);

        items << item;

        scene.addItem(item);

    }

    // Buttons

    QGraphicsItem *buttonParent = new QGraphicsRectItem;

    Button *ellipseButton = new Button(QPixmap(":/images/ellipse.png"), buttonParent);

    Button *figure8Button = new Button(QPixmap(":/images/figure8.png"), buttonParent);

    Button *randomButton = new Button(QPixmap(":/images/random.png"), buttonParent);

    Button *tiledButton = new Button(QPixmap(":/images/tile.png"), buttonParent);

    Button *centeredButton = new Button(QPixmap(":/images/centered.png"), buttonParent);

    ellipseButton->setPos(-100, -100);

    figure8Button->setPos(100, -100);

    randomButton->setPos(0, 0);

    tiledButton->setPos(-100, 100);

    centeredButton->setPos(100, 100);

    scene.addItem(buttonParent);

    buttonParent->scale(0.75, 0.75);

    buttonParent->setPos(200, 200);

    buttonParent->setZValue(65);

    // States

    QState *rootState = new QState;

    QState *ellipseState = new QState(rootState);

    QState *figure8State = new QState(rootState);

    QState *randomState = new QState(rootState);

    QState *tiledState = new QState(rootState);

    QState *centeredState = new QState(rootState);

    // Values

    for (int i = 0; i < items.count(); ++i) {

        Pixmap *item = items.at(i);

        // Ellipse

        ellipseState->assignProperty(item, "pos",

                                         QPointF(cos((i / 63.0) * 6.28) * 250,

                                                 sin((i / 63.0) * 6.28) * 250));

        // Figure 8

        figure8State->assignProperty(item, "pos",

                                         QPointF(sin((i / 63.0) * 6.28) * 250,

                                                 sin(((i * 2)/63.0) * 6.28) * 250));

        // Random

        randomState->assignProperty(item, "pos",

                                        QPointF(-250 + qrand() % 500,

                                                -250 + qrand() % 500));

        // Tiled

        tiledState->assignProperty(item, "pos",

                                       QPointF(((i % 8) - 4) * kineticPix.width() + kineticPix.width() / 2,

                                               ((i / 8) - 4) * kineticPix.height() + kineticPix.height() / 2));

        // Centered

        centeredState->assignProperty(item, "pos", QPointF());

    }

    // Ui

    View *view = new View(&scene);

    view->setWindowTitle(QT_TRANSLATE_NOOP(QGraphicsView, "Animated Tiles"));

    view->setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);

    view->setBackgroundBrush(bgPix);

    view->setCacheMode(QGraphicsView::CacheBackground);

    view->setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);

    view->show();

    QStateMachine states;

    states.addState(rootState);

    states.setInitialState(rootState);

    rootState->setInitialState(centeredState);

    QParallelAnimationGroup *group = new QParallelAnimationGroup;

    for (int i = 0; i < items.count(); ++i) {

        QPropertyAnimation *anim = new QPropertyAnimation(items[i], "pos");

        anim->setDuration(750 + i * 25);

        anim->setEasingCurve(QEasingCurve::InOutBack);

        group->addAnimation(anim);

    }

    QAbstractTransition *trans = rootState->addTransition(ellipseButton, SIGNAL(pressed()), ellipseState);

    trans->addAnimation(group);

    trans = rootState->addTransition(figure8Button, SIGNAL(pressed()), figure8State);

    trans->addAnimation(group);

    trans = rootState->addTransition(randomButton, SIGNAL(pressed()), randomState);

    trans->addAnimation(group);

    trans = rootState->addTransition(tiledButton, SIGNAL(pressed()), tiledState);

    trans->addAnimation(group);

    trans = rootState->addTransition(centeredButton, SIGNAL(pressed()), centeredState);

    trans->addAnimation(group);

    QTimer timer;

    timer.start(125);

    timer.setSingleShot(true);

    trans = rootState->addTransition(&timer, SIGNAL(timeout()), ellipseState);

    trans->addAnimation(group);

    states.start();

#ifdef QT_KEYPAD_NAVIGATION

    QApplication::setNavigationMode(Qt::NavigationModeCursorAuto);

#endif

    return app.exec();

}

#include "main.moc"