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#include "blurpicker.h"

#include <QtGui>

#include "blureffect.h"

#ifndef M_PI

#define M_PI 3.14159265358979323846

#endif

BlurPicker::BlurPicker(QWidget *parent): QGraphicsView(parent), m_index(0.0), m_animation(this, "index")

{

    setBackgroundBrush(QPixmap(":/images/background.jpg"));

    setScene(new QGraphicsScene(this));

    setupScene();

    setIndex(0);

    m_animation.setDuration(400);

    m_animation.setEasingCurve(QEasingCurve::InOutSine);

    setRenderHint(QPainter::Antialiasing, true);

    setFrameStyle(QFrame::NoFrame);

}

qreal BlurPicker::index() const

{

    return m_index;

}

void BlurPicker::setIndex(qreal index)

{

    m_index = index;

    qreal baseline = 0;

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

        QGraphicsItem *icon = m_icons[i];

        qreal a = ((i + m_index) * 2 * M_PI) / m_icons.count();

        qreal xs = 170 * sin(a);

        qreal ys = 100 * cos(a);

        QPointF pos(xs, ys);

        pos = QTransform().rotate(-20).map(pos);

        pos -= QPointF(40, 40);

        icon->setPos(pos);

        baseline = qMax(baseline, ys);

        static_cast<BlurEffect *>(icon->graphicsEffect())->setBaseLine(baseline);

    }

    scene()->update();

}

void BlurPicker::setupScene()

{

    scene()->setSceneRect(-200, -120, 400, 240);

    QStringList names;

    names << ":/images/accessories-calculator.png";

    names << ":/images/accessories-text-editor.png";

    names << ":/images/help-browser.png";

    names << ":/images/internet-group-chat.png";

    names << ":/images/internet-mail.png";

    names << ":/images/internet-web-browser.png";

    names << ":/images/office-calendar.png";

    names << ":/images/system-users.png";

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

        QPixmap pixmap(names[i]);

        QGraphicsPixmapItem *icon = scene()->addPixmap(pixmap);

        icon->setZValue(1);

        icon->setGraphicsEffect(new BlurEffect(icon));

        m_icons << icon;

    }

    QGraphicsPixmapItem *bg = scene()->addPixmap(QPixmap(":/images/background.jpg"));

    bg->setZValue(0);

    bg->setPos(-200, -150);

}

void BlurPicker::keyPressEvent(QKeyEvent *event)

{

    int delta = 0;

    switch (event->key())

    {

    case Qt::Key_Left:

        delta = -1;

        break;

    case  Qt::Key_Right:

        delta = 1;

        break;

    default:

        break;

    }

    if (m_animation.state() == QAbstractAnimation::Stopped && delta) {

            m_animation.setEndValue(m_index + delta);

            m_animation.start();

            event->accept();

    }

}