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    41 

    42 #include "blurpicker.h"

    43 

    44 #include <QtGui>

    45 

    46 #include "blureffect.h"

    47 

    48 #ifndef M_PI

    49 #define M_PI 3.14159265358979323846

    50 #endif

    51 

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

    53 {

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

    55     setScene(new QGraphicsScene(this));

    56 

    57     setupScene();

    58     setIndex(0);

    59 

    60     m_animation.setDuration(400);

    61     m_animation.setEasingCurve(QEasingCurve::InOutSine);

    62 

    63     setRenderHint(QPainter::Antialiasing, true);

    64     setFrameStyle(QFrame::NoFrame);

    65 }

    66 

    67 qreal BlurPicker::index() const

    68 {

    69     return m_index;

    70 }

    71 

    72 void BlurPicker::setIndex(qreal index)

    73 {

    74     m_index = index;

    75 

    76     qreal baseline = 0;

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

    78         QGraphicsItem *icon = m_icons[i];

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

    80         qreal xs = 170 * sin(a);

    81         qreal ys = 100 * cos(a);

    82         QPointF pos(xs, ys);

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

    84         pos -= QPointF(40, 40);

    85         icon->setPos(pos);

    86         baseline = qMax(baseline, ys);

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

    88     }

    89 

    90     scene()->update();

    91 }

    92 

    93 void BlurPicker::setupScene()

    94 {

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

    96 

    97     QStringList names;

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

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

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

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

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

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

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

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

   106 

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

   108         QPixmap pixmap(names[i]);

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

   110         icon->setZValue(1);

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

   112         m_icons << icon;

   113     }

   114 

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

   116     bg->setZValue(0);

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

   118 }

   119 

   120 void BlurPicker::keyPressEvent(QKeyEvent *event)

   121 {

   122     int delta = 0;

   123     switch (event->key())

   124     {

   125     case Qt::Key_Left:

   126         delta = -1;

   127         break;

   128     case  Qt::Key_Right:

   129         delta = 1;

   130         break;

   131     default:

   132         break;

   133     }

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

   135             m_animation.setEndValue(m_index + delta);

   136             m_animation.start();

   137             event->accept();

   138     }

   139 }