Qt Reference Documentation

weatherinfo.cpp Example File

demos/embedded/weatherinfo/weatherinfo.cpp
 /****************************************************************************
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 ** Contact: Nokia Corporation (qt-info@nokia.com)
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 ** contained in the Technology Preview License Agreement accompanying
 ** this package.
 **
 ** GNU Lesser General Public License Usage
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 ** 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
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 **
 ** In addition, as a special exception, Nokia gives you certain additional
 ** rights.  These rights are described in the Nokia Qt LGPL Exception
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 #include <QtCore>
 #include <QtGui>
 #include <QtNetwork>
 #include <QtSvg>

 class WeatherInfo: public QMainWindow
 {
     Q_OBJECT

 private:

     QGraphicsView *m_view;
     QGraphicsScene m_scene;
     QString city;
     QGraphicsRectItem *m_statusItem;
     QGraphicsTextItem *m_temperatureItem;
     QGraphicsTextItem *m_conditionItem;
     QGraphicsSvgItem *m_iconItem;
     QList<QGraphicsRectItem*> m_forecastItems;
     QList<QGraphicsTextItem*> m_dayItems;
     QList<QGraphicsSvgItem*> m_conditionItems;
     QList<QGraphicsTextItem*> m_rangeItems;
     QTimeLine m_timeLine;
     QHash<QString, QString> m_icons;
     QNetworkAccessManager m_manager;

 public:
     WeatherInfo(QWidget *parent = 0): QMainWindow(parent) {

         m_view = new QGraphicsView(this);
         setCentralWidget(m_view);

         setupScene();
         m_view->setScene(&m_scene);
         m_view->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
         m_view->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

         m_view->setFrameShape(QFrame::NoFrame);
         setWindowTitle("Weather Info");

         QStringList cities;
         cities << "Oslo";
         cities << "Berlin";
         cities << "Brisbane";
         cities << "Helsinki";
         cities << "San Diego";
         for (int i = 0; i < cities.count(); ++i) {
             QAction *action = new QAction(cities[i], this);
             connect(action, SIGNAL(triggered()), SLOT(chooseCity()));
             addAction(action);
 #if defined(Q_OS_SYMBIAN)
             menuBar()->addAction(action);
 #endif
         }
         setContextMenuPolicy(Qt::ActionsContextMenu);

         connect(&m_manager, SIGNAL(finished(QNetworkReply*)),
                 this, SLOT(handleNetworkData(QNetworkReply*)));

         QTimer::singleShot(0, this, SLOT(delayedInit()));
     }

 private slots:
     void delayedInit() {
         request("Oslo");
     }

 private slots:

     void chooseCity() {
         QAction *action = qobject_cast<QAction*>(sender());
         if (action)
             request(action->text());
     }

     void handleNetworkData(QNetworkReply *networkReply) {
         QUrl url = networkReply->url();
         if (!networkReply->error())
             digest(QString::fromUtf8(networkReply->readAll()));
         networkReply->deleteLater();
     }

     void animate(int frame) {
         qreal progress = static_cast<qreal>(frame) / 100;
 #if QT_VERSION >= 0x040500
         m_iconItem->setOpacity(progress);
 #endif
         qreal hw = width() / 2.0;
         m_statusItem->setPos(-hw + hw * progress, 0);
         for (int i = 0; i < m_forecastItems.count(); ++i) {
             qreal ofs = i * 0.5 / m_forecastItems.count();
             qreal alpha = qBound(qreal(0), 2 * (progress - ofs), qreal(1));
 #if QT_VERSION >= 0x040500
             m_conditionItems[i]->setOpacity(alpha);
 #endif
             QPointF pos = m_forecastItems[i]->pos();
             if (width() > height()) {
                 qreal fx = width() - width() * 0.4 * alpha;
                 m_forecastItems[i]->setPos(fx, pos.y());
             } else {
                 qreal fx = height() - height() * 0.5 * alpha;
                 m_forecastItems[i]->setPos(pos.x(), fx);
             }
         }
     }

 private:

     void setupScene() {

         QColor textColor = palette().color(QPalette::WindowText);
         QFont textFont = font();
         textFont.setBold(true);
         textFont.setPointSize(textFont.pointSize() * 2);

         m_temperatureItem = m_scene.addText(QString(), textFont);
         m_temperatureItem->setDefaultTextColor(textColor);

         m_conditionItem = m_scene.addText(QString(), textFont);
         m_conditionItem->setDefaultTextColor(textColor);

         m_iconItem = new QGraphicsSvgItem;
         m_scene.addItem(m_iconItem);

         m_statusItem = m_scene.addRect(0, 0, 10, 10);
         m_statusItem->setPen(Qt::NoPen);
         m_statusItem->setBrush(Qt::NoBrush);
         m_temperatureItem->setParentItem(m_statusItem);
         m_conditionItem->setParentItem(m_statusItem);
         m_iconItem->setParentItem(m_statusItem);

         connect(&m_timeLine, SIGNAL(frameChanged(int)), SLOT(animate(int)));
         m_timeLine.setDuration(1100);
         m_timeLine.setFrameRange(0, 100);
         m_timeLine.setCurveShape(QTimeLine::EaseInCurve);
     }

     void request(const QString &location) {
         QUrl url("http://www.google.com/ig/api");
         url.addEncodedQueryItem("hl", "en");
         url.addEncodedQueryItem("weather", QUrl::toPercentEncoding(location));

         m_manager.get(QNetworkRequest(url));

         city = QString();
         setWindowTitle("Loading...");
     }

     QString extractIcon(const QString &data) {
         if (m_icons.isEmpty()) {
             m_icons["mostly_cloudy"]    = "weather-few-clouds";
             m_icons["cloudy"]           = "weather-overcast";
             m_icons["mostly_sunny"]     = "weather-sunny-very-few-clouds";
             m_icons["partly_cloudy"]    = "weather-sunny-very-few-clouds";
             m_icons["sunny"]            = "weather-sunny";
             m_icons["flurries"]         = "weather-snow";
             m_icons["fog"]              = "weather-fog";
             m_icons["haze"]             = "weather-haze";
             m_icons["icy"]              = "weather-icy";
             m_icons["sleet"]            = "weather-sleet";
             m_icons["chance_of_sleet"]  = "weather-sleet";
             m_icons["snow"]             = "weather-snow";
             m_icons["chance_of_snow"]   = "weather-snow";
             m_icons["mist"]             = "weather-showers";
             m_icons["rain"]             = "weather-showers";
             m_icons["chance_of_rain"]   = "weather-showers";
             m_icons["storm"]            = "weather-storm";
             m_icons["chance_of_storm"]  = "weather-storm";
             m_icons["thunderstorm"]     = "weather-thundershower";
             m_icons["chance_of_tstorm"] = "weather-thundershower";
         }
         QRegExp regex("([\\w]+).gif$");
         if (regex.indexIn(data) != -1) {
             QString i = regex.cap();
             i = i.left(i.length() - 4);
             QString name = m_icons.value(i);
             if (!name.isEmpty()) {
                 name.prepend(":/icons/");
                 name.append(".svg");
                 return name;
             }
         }
         return QString();
     }

     static QString toCelcius(QString t, QString unit) {
         bool ok = false;
         int degree = t.toInt(&ok);
         if (!ok)
             return QString();
         if (unit != "SI")
             degree = ((degree - 32) * 5 + 8)/ 9;
         return QString::number(degree) + QChar(176);
     }

 #define GET_DATA_ATTR xml.attributes().value("data").toString()

     void digest(const QString &data) {

         QColor textColor = palette().color(QPalette::WindowText);
         QString unitSystem;

         delete m_iconItem;
         m_iconItem = new QGraphicsSvgItem();
         m_scene.addItem(m_iconItem);
         m_iconItem->setParentItem(m_statusItem);
         qDeleteAll(m_dayItems);
         qDeleteAll(m_conditionItems);
         qDeleteAll(m_rangeItems);
         qDeleteAll(m_forecastItems);
         m_dayItems.clear();
         m_conditionItems.clear();
         m_rangeItems.clear();
         m_forecastItems.clear();

         QXmlStreamReader xml(data);
         while (!xml.atEnd()) {
             xml.readNext();
             if (xml.tokenType() == QXmlStreamReader::StartElement) {
                 if (xml.name() == "city") {
                     city = GET_DATA_ATTR;
                     setWindowTitle(city);
                 }
                 if (xml.name() == "unit_system")
                     unitSystem = xml.attributes().value("data").toString();
                 // Parse current weather conditions
                 if (xml.name() == "current_conditions") {
                     while (!xml.atEnd()) {
                         xml.readNext();
                         if (xml.name() == "current_conditions")
                             break;
                         if (xml.tokenType() == QXmlStreamReader::StartElement) {
                             if (xml.name() == "condition") {
                                 m_conditionItem->setPlainText(GET_DATA_ATTR);
                             }
                             if (xml.name() == "icon") {
                                 QString name = extractIcon(GET_DATA_ATTR);
                                 if (!name.isEmpty()) {
                                     delete m_iconItem;
                                     m_iconItem = new QGraphicsSvgItem(name);
                                     m_scene.addItem(m_iconItem);
                                     m_iconItem->setParentItem(m_statusItem);
                                 }
                             }
                             if (xml.name() == "temp_c") {
                                 QString s = GET_DATA_ATTR + QChar(176);
                                 m_temperatureItem->setPlainText(s);
                             }
                         }
                     }
                 }
                 // Parse and collect the forecast conditions
                 if (xml.name() == "forecast_conditions") {
                     QGraphicsTextItem *dayItem  = 0;
                     QGraphicsSvgItem *statusItem = 0;
                     QString lowT, highT;
                     while (!xml.atEnd()) {
                         xml.readNext();
                         if (xml.name() == "forecast_conditions") {
                             if (dayItem && statusItem &&
                                 !lowT.isEmpty() && !highT.isEmpty()) {
                                 m_dayItems << dayItem;
                                 m_conditionItems << statusItem;
                                 QString txt = highT + '/' + lowT;
                                 QGraphicsTextItem* rangeItem;
                                 rangeItem = m_scene.addText(txt);
                                 rangeItem->setDefaultTextColor(textColor);
                                 m_rangeItems << rangeItem;
                                 QGraphicsRectItem *box;
                                 box = m_scene.addRect(0, 0, 10, 10);
                                 box->setPen(Qt::NoPen);
                                 box->setBrush(Qt::NoBrush);
                                 m_forecastItems << box;
                                 dayItem->setParentItem(box);
                                 statusItem->setParentItem(box);
                                 rangeItem->setParentItem(box);
                             } else {
                                 delete dayItem;
                                 delete statusItem;
                             }
                             break;
                         }
                         if (xml.tokenType() == QXmlStreamReader::StartElement) {
                             if (xml.name() == "day_of_week") {
                                 QString s = GET_DATA_ATTR;
                                 dayItem = m_scene.addText(s.left(3));
                                 dayItem->setDefaultTextColor(textColor);
                             }
                             if (xml.name() == "icon") {
                                 QString name = extractIcon(GET_DATA_ATTR);
                                 if (!name.isEmpty()) {
                                     statusItem = new QGraphicsSvgItem(name);
                                     m_scene.addItem(statusItem);
                                 }
                             }
                             if (xml.name() == "low")
                                 lowT = toCelcius(GET_DATA_ATTR, unitSystem);
                             if (xml.name() == "high")
                                 highT = toCelcius(GET_DATA_ATTR, unitSystem);
                         }
                     }
                 }

             }
         }

         m_timeLine.stop();
         layoutItems();
         animate(0);
         m_timeLine.start();
     }

     void layoutItems() {
         m_scene.setSceneRect(0, 0, width() - 1, height() - 1);
         m_view->centerOn(width() / 2, height() / 2);
         if (width() > height())
             layoutItemsLandscape();
         else
             layoutItemsPortrait();
     }

     void layoutItemsLandscape() {
         m_statusItem->setRect(0, 0, width() / 2 - 1, height() - 1);

         if (!m_iconItem->boundingRect().isEmpty()) {
             qreal dim = qMin(width() * 0.6, height() * 0.8);
             qreal pad = (height()  - dim) / 2;
             qreal sw = dim / m_iconItem->boundingRect().width();
             qreal sh = dim / m_iconItem->boundingRect().height();
             m_iconItem->setTransform(QTransform().scale(sw, sh));
             m_iconItem->setPos(1, pad);
         }

         m_temperatureItem->setPos(2, 2);
         qreal h = m_conditionItem->boundingRect().height();
         m_conditionItem->setPos(10, height() - h);

         if (m_dayItems.count()) {
             qreal left = width() * 0.6;
             qreal h = height() / m_dayItems.count();
             QFont textFont = font();
             textFont.setPixelSize(static_cast<int>(h * 0.3));
             qreal statusWidth = 0;
             qreal rangeWidth = 0;
             for (int i = 0; i < m_dayItems.count(); ++i) {
                 m_dayItems[i]->setFont(textFont);
                 QRectF brect = m_dayItems[i]->boundingRect();
                 statusWidth = qMax(statusWidth, brect.width());
                 brect = m_rangeItems[i]->boundingRect();
                 rangeWidth = qMax(rangeWidth, brect.width());
             }
             qreal space = width() - left - statusWidth - rangeWidth;
             qreal dim = qMin(h, space);
             qreal pad = statusWidth + (space  - dim) / 2;
             for (int i = 0; i < m_dayItems.count(); ++i) {
                 qreal base = h * i;
                 m_forecastItems[i]->setPos(left, base);
                 m_forecastItems[i]->setRect(0, 0, width() - left, h);
                 QRectF brect = m_dayItems[i]->boundingRect();
                 qreal ofs = (h - brect.height()) / 2;
                 m_dayItems[i]->setPos(0, ofs);
                 brect = m_rangeItems[i]->boundingRect();
                 ofs = (h - brect.height()) / 2;
                 m_rangeItems[i]->setPos(width() - rangeWidth - left, ofs);
                 brect = m_conditionItems[i]->boundingRect();
                 ofs = (h - dim) / 2;
                 m_conditionItems[i]->setPos(pad, ofs);
                 if (brect.isEmpty())
                     continue;
                 qreal sw = dim / brect.width();
                 qreal sh = dim / brect.height();
                 m_conditionItems[i]->setTransform(QTransform().scale(sw, sh));
             }
         }
     }

     void layoutItemsPortrait() {

         m_statusItem->setRect(0, 0, width() - 1, height() / 2 - 1);

         if (!m_iconItem->boundingRect().isEmpty()) {
             qreal dim = qMin(width() * 0.8, height() * 0.4);
             qreal ofsy = (height() / 2  - dim) / 2;
             qreal ofsx = (width() - dim) / 3;
             qreal sw = dim / m_iconItem->boundingRect().width();
             qreal sh = dim / m_iconItem->boundingRect().height();
             m_iconItem->setTransform(QTransform().scale(sw, sh));
             m_iconItem->setPos(ofsx, ofsy);
         }

         m_temperatureItem->setPos(2, 2);
         qreal ch = m_conditionItem->boundingRect().height();
         qreal cw = m_conditionItem->boundingRect().width();
         m_conditionItem->setPos(width() - cw , height() / 2 - ch - 20);

         if (m_dayItems.count()) {
             qreal top = height() * 0.5;
             qreal w = width() / m_dayItems.count();
             qreal statusHeight = 0;
             qreal rangeHeight = 0;
             for (int i = 0; i < m_dayItems.count(); ++i) {
                 m_dayItems[i]->setFont(font());
                 QRectF brect = m_dayItems[i]->boundingRect();
                 statusHeight = qMax(statusHeight, brect.height());
                 brect = m_rangeItems[i]->boundingRect();
                 rangeHeight = qMax(rangeHeight, brect.height());
             }
             qreal space = height() - top - statusHeight - rangeHeight;
             qreal dim = qMin(w, space);

             qreal boxh = statusHeight + rangeHeight + dim;
             qreal pad = (height() - top - boxh) / 2;

             for (int i = 0; i < m_dayItems.count(); ++i) {
                 qreal base = w * i;
                 m_forecastItems[i]->setPos(base, top);
                 m_forecastItems[i]->setRect(0, 0, w, boxh);
                 QRectF brect = m_dayItems[i]->boundingRect();
                 qreal ofs = (w - brect.width()) / 2;
                 m_dayItems[i]->setPos(ofs, pad);

                 brect = m_rangeItems[i]->boundingRect();
                 ofs = (w - brect.width()) / 2;
                 m_rangeItems[i]->setPos(ofs, pad + statusHeight + dim);

                 brect = m_conditionItems[i]->boundingRect();
                 ofs = (w - dim) / 2;
                 m_conditionItems[i]->setPos(ofs, pad + statusHeight);
                 if (brect.isEmpty())
                     continue;
                 qreal sw = dim / brect.width();
                 qreal sh = dim / brect.height();
                 m_conditionItems[i]->setTransform(QTransform().scale(sw, sh));
             }
         }
     }

     void resizeEvent(QResizeEvent *event) {
         Q_UNUSED(event);
         layoutItems();
     }

 };

 #include "weatherinfo.moc"

 int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);

     WeatherInfo w;
 #if defined(Q_OS_SYMBIAN)
     w.showMaximized();
 #else
     w.resize(520, 288);
     w.show();
 #endif

     return app.exec();
 }
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