Qt 4.8: flightinfo.cpp Example File (demos/embedded/flightinfo/flightinfo.cpp)

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# flightinfo.cpp Example File

demos/embedded/flightinfo/flightinfo.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
     ** Contact: http://www.qt-project.org/legal
     **
     ** This file is part of the demonstration applications of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:LGPL$
     ** Commercial License Usage
     ** Licensees holding valid commercial Qt licenses may use this file in
     ** accordance with the commercial license agreement provided with the
     ** Software or, alternatively, in accordance with the terms contained in
     ** a written agreement between you and Digia.  For licensing terms and
     ** conditions see http://qt.digia.com/licensing.  For further information
     ** use the contact form at http://qt.digia.com/contact-us.
     **
     ** GNU Lesser General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU Lesser
     ** General Public License version 2.1 as published by the Free Software
     ** Foundation and appearing in the file LICENSE.LGPL included in the
     ** packaging of this file.  Please review the following information to
     ** ensure the GNU Lesser General Public License version 2.1 requirements
     ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
     **
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     ** rights.  These rights are described in the Digia Qt LGPL Exception
     ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
     **
     ** GNU General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU
     ** General Public License version 3.0 as published by the Free Software
     ** Foundation and appearing in the file LICENSE.GPL included in the
     ** packaging of this file.  Please review the following information to
     ** ensure the GNU General Public License version 3.0 requirements will be
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     ****************************************************************************/

     #include <QtCore>
     #include <QtGui>
     #include <QtNetwork>

     #include "ui_form.h"

     #define FLIGHTVIEW_URL "http://mobile.flightview.com/TrackByFlight.aspx"
     #define FLIGHTVIEW_RANDOM "http://mobile.flightview.com/TrackSampleFlight.aspx"

     // strips all invalid constructs that might trip QXmlStreamReader
     static QString sanitized(const QString &xml)
     {
         QString data = xml;

         // anything up to the html tag
         int i = data.indexOf("<html");
         if (i > 0)
             data.remove(0, i - 1);

         // everything inside the head tag
         i = data.indexOf("<head");
         if (i > 0)
             data.remove(i, data.indexOf("</head>") - i + 7);

         // invalid link for JavaScript code
         while (true) {
             i  = data.indexOf("onclick=\"gotoUrl(");
             if (i < 0)
                 break;
             data.remove(i, data.indexOf('\"', i + 9) - i + 1);
         }

         // all inline frames
         while (true) {
             i  = data.indexOf("<iframe");
             if (i < 0)
                 break;
             data.remove(i, data.indexOf("</iframe>") - i + 8);
         }

         // entities
         data.remove("&nbsp;");
         data.remove("&copy;");

         return data;
     }

     class FlightInfo : public QMainWindow
     {
         Q_OBJECT

     private:

         Ui_Form ui;
         QUrl m_url;
         QDate m_searchDate;
         QPixmap m_map;
         QNetworkAccessManager m_manager;
         QList<QNetworkReply *> mapReplies;

     public:

         FlightInfo(QMainWindow *parent = 0): QMainWindow(parent) {

             QWidget *w = new QWidget(this);
             ui.setupUi(w);
             setCentralWidget(w);

             ui.searchBar->hide();
             ui.infoBox->hide();
             connect(ui.searchButton, SIGNAL(clicked()), SLOT(startSearch()));
             connect(ui.flightEdit, SIGNAL(returnPressed()), SLOT(startSearch()));

             setWindowTitle("Flight Info");

             // Rendered from the public-domain vectorized aircraft
             // http://openclipart.org/media/people/Jarno
             m_map = QPixmap(":/aircraft.png");

             QAction *searchTodayAction = new QAction("Today's Flight", this);
             QAction *searchYesterdayAction = new QAction("Yesterday's Flight", this);
             QAction *randomAction = new QAction("Random Flight", this);
             connect(searchTodayAction, SIGNAL(triggered()), SLOT(today()));
             connect(searchYesterdayAction, SIGNAL(triggered()), SLOT(yesterday()));
             connect(randomAction, SIGNAL(triggered()), SLOT(randomFlight()));
             connect(&m_manager, SIGNAL(finished(QNetworkReply*)),
                     this, SLOT(handleNetworkData(QNetworkReply*)));
     #if defined(Q_OS_SYMBIAN)
             menuBar()->addAction(searchTodayAction);
             menuBar()->addAction(searchYesterdayAction);
             menuBar()->addAction(randomAction);
     #else
             addAction(searchTodayAction);
             addAction(searchYesterdayAction);
             addAction(randomAction);
             setContextMenuPolicy(Qt::ActionsContextMenu);
     #endif
         }

     private slots:

         void handleNetworkData(QNetworkReply *networkReply) {
             if (!networkReply->error()) {
                 if (!mapReplies.contains(networkReply)) {
                     // Assume UTF-8 encoded
                     QByteArray data = networkReply->readAll();
                     QString xml = QString::fromUtf8(data);
                     digest(xml);
                 } else {
                     mapReplies.removeOne(networkReply);
                     m_map.loadFromData(networkReply->readAll());
                     update();
                 }
             }
             networkReply->deleteLater();
         }

         void today() {
             QDateTime timestamp = QDateTime::currentDateTime();
             m_searchDate = timestamp.date();
             searchFlight();
         }

         void yesterday() {
             QDateTime timestamp = QDateTime::currentDateTime();
             timestamp = timestamp.addDays(-1);
             m_searchDate = timestamp.date();
             searchFlight();
         }

         void searchFlight() {
             ui.searchBar->show();
             ui.infoBox->hide();
             ui.flightStatus->hide();
             ui.flightName->setText("Enter flight number");
             ui.flightEdit->setFocus();
     #ifdef QT_KEYPAD_NAVIGATION
             ui.flightEdit->setEditFocus(true);
     #endif
             m_map = QPixmap();
             update();
         }

         void startSearch() {
             ui.searchBar->hide();
             QString flight = ui.flightEdit->text().simplified();
             if (!flight.isEmpty())
                 request(flight, m_searchDate);
         }

         void randomFlight() {
             request(QString(), QDate::currentDate());
         }

     public slots:

         void request(const QString &flightCode, const QDate &date) {

             setWindowTitle("Loading...");

             QString code = flightCode.simplified();
             QString airlineCode = code.left(2).toUpper();
             QString flightNumber = code.mid(2, code.length());

             ui.flightName->setText("Searching for " + code);

             m_url = QUrl(FLIGHTVIEW_URL);
             m_url.addEncodedQueryItem("view", "detail");
             m_url.addEncodedQueryItem("al", QUrl::toPercentEncoding(airlineCode));
             m_url.addEncodedQueryItem("fn", QUrl::toPercentEncoding(flightNumber));
             m_url.addEncodedQueryItem("dpdat", QUrl::toPercentEncoding(date.toString("yyyyMMdd")));

             if (code.isEmpty()) {
                 // random flight as sample
                 m_url = QUrl(FLIGHTVIEW_RANDOM);
                 ui.flightName->setText("Getting a random flight...");
             }

             m_manager.get(QNetworkRequest(m_url));
         }

     private:

         void digest(const QString &content) {

             setWindowTitle("Flight Info");
             QString data = sanitized(content);

             // do we only get the flight list?
             // we grab the first leg in the flight list
             // then fetch another URL for the real flight info
             int i = data.indexOf("a href=\"?view=detail");
             if (i > 0) {
                 QString href = data.mid(i, data.indexOf('\"', i + 8) - i + 1);
                 QRegExp regex("dpap=([A-Za-z0-9]+)");
                 regex.indexIn(href);
                 QString airport = regex.cap(1);
                 m_url.addEncodedQueryItem("dpap", QUrl::toPercentEncoding(airport));
                 m_manager.get(QNetworkRequest(m_url));
                 return;
             }

             QXmlStreamReader xml(data);
             bool inFlightName = false;
             bool inFlightStatus = false;
             bool inFlightMap = false;
             bool inFieldName = false;
             bool inFieldValue = false;

             QString flightName;
             QString flightStatus;
             QStringList fieldNames;
             QStringList fieldValues;

             while (!xml.atEnd()) {
                 xml.readNext();

                 if (xml.tokenType() == QXmlStreamReader::StartElement) {
                     QStringRef className = xml.attributes().value("class");
                     inFlightName |= xml.name() == "h1";
                     inFlightStatus |= className == "FlightDetailHeaderStatus";
                     inFlightMap |= className == "flightMap";
                     if (xml.name() == "td" && !className.isEmpty()) {
                         QString cn = className.toString();
                         if (cn.contains("fieldTitle")) {
                             inFieldName = true;
                             fieldNames += QString();
                             fieldValues += QString();
                         }
                         if (cn.contains("fieldValue"))
                             inFieldValue = true;
                     }
                     if (xml.name() == "img" && inFlightMap) {
                         QString src = xml.attributes().value("src").toString();
                         src.prepend("http://mobile.flightview.com/");
                         QUrl url = QUrl::fromPercentEncoding(src.toAscii());
                         mapReplies.append(m_manager.get(QNetworkRequest(url)));
                     }
                 }

                 if (xml.tokenType() == QXmlStreamReader::EndElement) {
                     inFlightName &= xml.name() != "h1";
                     inFlightStatus &= xml.name() != "div";
                     inFlightMap &= xml.name() != "div";
                     inFieldName &= xml.name() != "td";
                     inFieldValue &= xml.name() != "td";
                 }

                 if (xml.tokenType() == QXmlStreamReader::Characters) {
                     if (inFlightName)
                         flightName += xml.text();
                     if (inFlightStatus)
                         flightStatus += xml.text();
                     if (inFieldName)
                         fieldNames.last() += xml.text();
                     if (inFieldValue)
                         fieldValues.last() += xml.text();
                 }
             }

             if (fieldNames.isEmpty()) {
                 QString code = ui.flightEdit->text().simplified().left(10);
                 QString msg = QString("Flight %1 is not found").arg(code);
                 ui.flightName->setText(msg);
                 return;
             }

             ui.flightName->setText(flightName);
             flightStatus.remove("Status: ");
             ui.flightStatus->setText(flightStatus);
             ui.flightStatus->show();

             QStringList whiteList;
             whiteList << "Departure";
             whiteList << "Arrival";
             whiteList << "Scheduled";
             whiteList << "Takeoff";
             whiteList << "Estimated";
             whiteList << "Term-Gate";

             QString text;
             text = QString("<table width=%1>").arg(width() - 25);
             for (int i = 0; i < fieldNames.count(); i++) {
                 QString fn = fieldNames[i].simplified();
                 if (fn.endsWith(':'))
                     fn = fn.left(fn.length() - 1);
                 if (!whiteList.contains(fn))
                     continue;

                 QString fv = fieldValues[i].simplified();
                 bool special = false;
                 special |= fn.startsWith("Departure");
                 special |= fn.startsWith("Arrival");
                 text += "<tr>";
                 if (special) {
                     text += "<td align=center colspan=2>";
                     text += "<b><font size=+1>" + fv + "</font></b>";
                     text += "</td>";
                 } else {
                     text += "<td align=right>";
                     text += fn;
                     text += " : ";
                     text += "&nbsp;";
                     text += "</td>";
                     text += "<td>";
                     text += fv;
                     text += "</td>";
                 }
                 text += "</tr>";
             }
             text += "</table>";
             ui.detailedInfo->setText(text);
             ui.infoBox->show();
         }

         void resizeEvent(QResizeEvent *event) {
             Q_UNUSED(event);
             ui.detailedInfo->setMaximumWidth(width() - 25);
         }

         void paintEvent(QPaintEvent *event) {
             QMainWindow::paintEvent(event);
             QPainter p(this);
             p.fillRect(rect(), QColor(131, 171, 210));
             if (!m_map.isNull()) {
                 int x = (width() - m_map.width()) / 2;
                 int space = ui.infoBox->pos().y();
                 if (!ui.infoBox->isVisible())
                     space = height();
                 int top = ui.titleBox->height();
                 int y = qMax(top, (space - m_map.height()) / 2);
                 p.drawPixmap(x, y, m_map);
             }
             p.end();
         }

     };

     #include "flightinfo.moc"

     int main(int argc, char **argv)
     {
         Q_INIT_RESOURCE(flightinfo);

         QApplication app(argc, argv);

         FlightInfo w;
     #if defined(Q_OS_SYMBIAN)
         w.showMaximized();
     #else
         w.resize(360, 504);
         w.show();
     #endif

         return app.exec();
     }