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->setShortcut(tr("Ctrl+Q"));
     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()
 {
     TimeQuery query;
     m_times = query.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();
     }
 }