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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)

{

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

    setScene(&m_scene);

    setupScene();

    updateIconPositions();

    connect(&m_timeLine, SIGNAL(valueChanged(qreal)), SLOT(updateIconPositions()));

    m_timeLine.setDuration(400);

    setRenderHint(QPainter::Antialiasing, true);

    setFrameStyle(QFrame::NoFrame);

}

void BlurPicker::updateIconPositions()

{

    m_index = m_timeLine.currentFrame() / 1000.0;

    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);

    }

    m_scene.update();

}

void BlurPicker::setupScene()

{

    m_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 = m_scene.addPixmap(pixmap);

        icon->setZValue(1);

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

        m_icons << icon;

    }

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

    bg->setZValue(0);

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

}

void BlurPicker::keyPressEvent(QKeyEvent *event)

{

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

        if (m_timeLine.state() == QTimeLine::NotRunning) {

            m_timeLine.setFrameRange(m_index * 1000, m_index * 1000 - 1000);

            m_timeLine.start();

            event->accept();

        }

    }

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

        if (m_timeLine.state() == QTimeLine::NotRunning) {

            m_timeLine.setFrameRange(m_index * 1000, m_index * 1000 + 1000);

            m_timeLine.start();

            event->accept();

        }

    }

}