mainwindow.cpp Example File

 /****************************************************************************
 **
 ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** You may use this file under the terms of the BSD license as follows:
 **
 ** "Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions are
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
 **     the names of its contributors may be used to endorse or promote
 **     products derived from this software without specific prior written
 **     permission.
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #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();
     }
 }