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    40 ****************************************************************************/

    41 

    42 #include "blurpicker.h"

    43 

    44 #include <QtGui>

    45 

    46 #include "blureffect.h"

    47 #include "customshadereffect.h"

    48 

    49 #ifndef M_PI

    50 #define M_PI 3.14159265358979323846

    51 #endif

    52 

    53 BlurPicker::BlurPicker(QWidget *parent): QGraphicsView(parent), m_index(0.0)

    54 {

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

    56     setScene(&m_scene);

    57 

    58     setupScene();

    59     updateIconPositions();

    60 

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

    62     m_timeLine.setDuration(400);

    63 

    64     setRenderHint(QPainter::Antialiasing, true);

    65     setFrameStyle(QFrame::NoFrame);

    66 }

    67 

    68 void BlurPicker::updateIconPositions()

    69 {

    70     m_index = m_timeLine.currentFrame() / 1000.0;

    71 

    72     qreal baseline = 0;

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

    74         QGraphicsItem *icon = m_icons[i];

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

    76         qreal xs = 170 * sin(a);

    77         qreal ys = 100 * cos(a);

    78         QPointF pos(xs, ys);

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

    80         pos -= QPointF(40, 40);

    81         icon->setPos(pos);

    82         baseline = qMax(baseline, ys);

    83         if (i != 3)

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

    85     }

    86 

    87     m_scene.update();

    88 }

    89 

    90 void BlurPicker::setupScene()

    91 {

    92     m_scene.setSceneRect(-200, -120, 400, 240);

    93 

    94     QStringList names;

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

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

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

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

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

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

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

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

   103 

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

   105         QPixmap pixmap(names[i]);

   106         QGraphicsPixmapItem *icon = m_scene.addPixmap(pixmap);

   107         icon->setZValue(1);

   108         if (i == 3)

   109             icon->setGraphicsEffect(new CustomShaderEffect());

   110         else

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

   112         m_icons << icon;

   113     }

   114 

   115     QGraphicsPixmapItem *bg = m_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     if (event->key() == Qt::Key_Left) {

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

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

   125             m_timeLine.start();

   126             event->accept();

   127         }

   128     }

   129 

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

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

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

   133             m_timeLine.start();

   134             event->accept();

   135         }

   136     }

   137 }