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

    41 

    42 #include <QtGui>

    43 

    44 #include "shapedclock.h"

    45 

    46 //! [0]

    47 ShapedClock::ShapedClock(QWidget *parent)

    48     : QWidget(parent, Qt::FramelessWindowHint | Qt::WindowSystemMenuHint)

    49 {

    50     QTimer *timer = new QTimer(this);

    51     connect(timer, SIGNAL(timeout()), this, SLOT(update()));

    52     timer->start(1000);

    53 

    54     QAction *quitAction = new QAction(tr("E&xit"), this);

    55     quitAction->setShortcut(tr("Ctrl+Q"));

    56     connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));

    57     addAction(quitAction);

    58 

    59     setContextMenuPolicy(Qt::ActionsContextMenu);

    60     setToolTip(tr("Drag the clock with the left mouse button.\n"

    61                   "Use the right mouse button to open a context menu."));

    62     setWindowTitle(tr("Shaped Analog Clock"));

    63 }

    64 //! [0]

    65 

    66 //! [1]

    67 void ShapedClock::mousePressEvent(QMouseEvent *event)

    68 {

    69     if (event->button() == Qt::LeftButton) {

    70         dragPosition = event->globalPos() - frameGeometry().topLeft();

    71         event->accept();

    72     }

    73 }

    74 //! [1]

    75 

    76 //! [2]

    77 void ShapedClock::mouseMoveEvent(QMouseEvent *event)

    78 {

    79     if (event->buttons() & Qt::LeftButton) {

    80         move(event->globalPos() - dragPosition);

    81         event->accept();

    82     }

    83 }

    84 //! [2]

    85 

    86 //! [3]

    87 void ShapedClock::paintEvent(QPaintEvent *)

    88 {

    89     static const QPoint hourHand[3] = {

    90         QPoint(7, 8),

    91         QPoint(-7, 8),

    92         QPoint(0, -40)

    93     };

    94     static const QPoint minuteHand[3] = {

    95         QPoint(7, 8),

    96         QPoint(-7, 8),

    97         QPoint(0, -70)

    98     };

    99 

   100     QColor hourColor(127, 0, 127);

   101     QColor minuteColor(0, 127, 127, 191);

   102 

   103     int side = qMin(width(), height());

   104     QTime time = QTime::currentTime();

   105 

   106     QPainter painter(this);

   107     painter.setRenderHint(QPainter::Antialiasing);

   108     painter.translate(width() / 2, height() / 2);

   109     painter.scale(side / 200.0, side / 200.0);

   110 

   111     painter.setPen(Qt::NoPen);

   112     painter.setBrush(hourColor);

   113 

   114     painter.save();

   115     painter.rotate(30.0 * ((time.hour() + time.minute() / 60.0)));

   116     painter.drawConvexPolygon(hourHand, 3);

   117     painter.restore();

   118 

   119     painter.setPen(hourColor);

   120 

   121     for (int i = 0; i < 12; ++i) {

   122         painter.drawLine(88, 0, 96, 0);

   123         painter.rotate(30.0);

   124     }

   125 

   126     painter.setPen(Qt::NoPen);

   127     painter.setBrush(minuteColor);

   128 

   129     painter.save();

   130     painter.rotate(6.0 * (time.minute() + time.second() / 60.0));

   131     painter.drawConvexPolygon(minuteHand, 3);

   132     painter.restore();

   133 

   134     painter.setPen(minuteColor);

   135 

   136     for (int j = 0; j < 60; ++j) {

   137         if ((j % 5) != 0)

   138             painter.drawLine(92, 0, 96, 0);

   139         painter.rotate(6.0);

   140     }

   141 }

   142 //! [3]

   143 

   144 //! [4]

   145 void ShapedClock::resizeEvent(QResizeEvent * /* event */)

   146 {

   147     int side = qMin(width(), height());

   148     QRegion maskedRegion(width() / 2 - side / 2, height() / 2 - side / 2, side,

   149                          side, QRegion::Ellipse);

   150     setMask(maskedRegion);

   151 }

   152 //! [4]

   153 

   154 //! [5]

   155 QSize ShapedClock::sizeHint() const

   156 {

   157     return QSize(100, 100);

   158 }

   159 //! [5]