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# mainwindow.cpp Example File
xmlpatterns/trafficinfo/mainwindow.cpp

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     #include "mainwindow.h"
     #include "stationdialog.h"

     #include <QtCore/QSettings>
     #include <QtCore/QTimer>
     #include <QtGui/QAction>
     #include <QtGui/QApplication>
     #include <QtGui/QBitmap>
     #include <QtGui/QLinearGradient>
     #include <QtGui/QMouseEvent>
     #include <QtGui/QPainter>

     MainWindow::MainWindow()
         : QWidget(0, Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint)
     {
         QAction *quitAction = new QAction(tr("E&xit"), this);
         quitAction->setShortcuts(QKeySequence::Quit);
         connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));

         QAction *configAction = new QAction(tr("&Select station..."), this);
         configAction->setShortcut(tr("Ctrl+C"));
         connect(configAction, SIGNAL(triggered()), this, SLOT(configure()));

         addAction(configAction);
         addAction(quitAction);

         setContextMenuPolicy(Qt::ActionsContextMenu);

         setWindowTitle(tr("Traffic Info Oslo"));

         const QSettings settings("Qt Traffic Info", "trafficinfo");
         m_station = StationInformation(settings.value("stationId", "03012130").toString(),
                                        settings.value("stationName", "Nydalen [T-bane] (OSL)").toString());
         m_lines = settings.value("lines", QStringList()).toStringList();

         QTimer *timer = new QTimer(this);
         connect(timer, SIGNAL(timeout()), this, SLOT(updateTimeInformation()));
         timer->start(1000*60*5);
         QMetaObject::invokeMethod(this, SLOT(updateTimeInformation()), Qt::QueuedConnection);
     }

     MainWindow::~MainWindow()
     {
         QSettings settings("Qt Traffic Info", "trafficinfo");
         settings.setValue("stationId", m_station.id());
         settings.setValue("stationName", m_station.name());
         settings.setValue("lines", m_lines);
     }

     QSize MainWindow::sizeHint() const
     {
         return QSize(300, 200);
     }

     void MainWindow::mouseMoveEvent(QMouseEvent *event)
     {
         if (event->buttons() & Qt::LeftButton) {
             move(event->globalPos() - m_dragPosition);
             event->accept();
         }
     }

     void MainWindow::mousePressEvent(QMouseEvent *event)
     {
         if (event->button() == Qt::LeftButton) {
             m_dragPosition = event->globalPos() - frameGeometry().topLeft();
             event->accept();
         }
     }

     void MainWindow::paintEvent(QPaintEvent*)
     {
         const QPoint start(width()/2, 0);
         const QPoint finalStop(width()/2, height());
         QLinearGradient gradient(start, finalStop);
         const QColor qtGreen(102, 176, 54);
         gradient.setColorAt(0, qtGreen.dark());
         gradient.setColorAt(0.5, qtGreen);
         gradient.setColorAt(1, qtGreen.dark());

         QPainter p(this);
         p.fillRect(0, 0, width(), height(), gradient);

         QFont headerFont("Sans Serif", 12, QFont::Bold);
         QFont normalFont("Sans Serif", 9, QFont::Normal);

         // draw it twice for shadow effect
         p.setFont(headerFont);
         QRect headerRect(1, 1, width(), 25);
         p.setPen(Qt::black);
         p.drawText(headerRect, Qt::AlignCenter, m_station.name());

         headerRect.moveTopLeft(QPoint(0, 0));
         p.setPen(Qt::white);
         p.drawText(headerRect, Qt::AlignCenter, m_station.name());

         p.setFont(normalFont);
         int pos = 40;
         for (int i = 0; i < m_times.count() && i < 9; ++i) {
             p.setPen(Qt::black);
             p.drawText(51, pos + 1, m_times.at(i).time());
             p.drawText(101, pos + 1, m_times.at(i).direction());

             p.setPen(Qt::white);
             p.drawText(50, pos, m_times.at(i).time());
             p.drawText(100, pos, m_times.at(i).direction());

             pos += 18;
         }
     }

     void MainWindow::resizeEvent(QResizeEvent*)
     {
         QBitmap maskBitmap(width(), height());
         maskBitmap.clear();

         QPainter p(&maskBitmap);
         p.setBrush(Qt::black);
         p.drawRoundRect(0, 0, width(), height(), 20, 30);
         p.end();

         setMask(maskBitmap);
     }

     void MainWindow::updateTimeInformation()
     {
         m_times = TimeQuery::query(m_station.id(), m_lines, QDateTime::currentDateTime());

         update();
     }

     void MainWindow::configure()
     {
         StationDialog dlg(m_station.name(), m_lines, this);
         if (dlg.exec()) {
             m_station = dlg.selectedStation();
             m_lines = dlg.lineNumbers();
             updateTimeInformation();
         }
     }