flightinfo.cpp Example File

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 #include <QtCore>
 #include <QtWidgets>
 #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*)));
         addAction(searchTodayAction);
         addAction(searchYesterdayAction);
         addAction(randomAction);
         setContextMenuPolicy(Qt::ActionsContextMenu);
     }

 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;
     w.resize(360, 504);
     w.show();

     return app.exec();
 }