weatherinfo example: use lambdas instead of QSignalMapper

QSignalMapper is deprecated since Qt 5.10. Besides code
looks clearer with lambdas.

Change-Id: I7e4681e0d6b354cd8da9a4506dad917799688dc9
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

2 files changed, 12 insertions, 31 deletions

diff --git a/examples/positioning/weatherinfo/appmodel.cpp b/examples/positioning/weatherinfo/appmodel.cpp
index 4d8806b8..f17d8141 100644
--- a/examples/positioning/weatherinfo/appmodel.cpp
+++ b/examples/positioning/weatherinfo/appmodel.cpp
@@ -47,7 +47,6 @@
 #include <qnetworkconfigmanager.h>
 #include <qnetworksession.h>
 
-#include <QSignalMapper>
 #include <QJsonDocument>
 #include <QJsonObject>
 #include <QJsonArray>
@@ -145,8 +144,6 @@ public:
     WeatherData now;
     QList<WeatherData*> forecast;
     QQmlListProperty<WeatherData> *fcProp;
-    QSignalMapper *geoReplyMapper;
-    QSignalMapper *weatherReplyMapper, *forecastReplyMapper;
     bool ready;
     bool useGps;
     QElapsedTimer throttle;
@@ -210,16 +207,6 @@ AppModel::AppModel(QObject *parent) :
                                                           forecastAt,
                                                           forecastClear);
 
-    d->geoReplyMapper = new QSignalMapper(this);
-    d->weatherReplyMapper = new QSignalMapper(this);
-    d->forecastReplyMapper = new QSignalMapper(this);
-
-    connect(d->geoReplyMapper, SIGNAL(mapped(QObject*)),
-            this, SLOT(handleGeoNetworkData(QObject*)));
-    connect(d->weatherReplyMapper, SIGNAL(mapped(QObject*)),
-            this, SLOT(handleWeatherNetworkData(QObject*)));
-    connect(d->forecastReplyMapper, SIGNAL(mapped(QObject*)),
-            this, SLOT(handleForecastNetworkData(QObject*)));
     connect(&d->delayedCityRequestTimer, SIGNAL(timeout()),
             this, SLOT(queryCity()));
     connect(&d->requestNewWeatherTimer, SIGNAL(timeout()),
@@ -312,9 +299,8 @@ void AppModel::queryCity()
 
     QNetworkReply *rep = d->nam->get(QNetworkRequest(url));
     // connect up the signal right away
-    d->geoReplyMapper->setMapping(rep, rep);
-    connect(rep, SIGNAL(finished()),
-            d->geoReplyMapper, SLOT(map()));
+    connect(rep, &QNetworkReply::finished,
+            this, [this, rep]() { handleGeoNetworkData(rep); });
 }
 
 void AppModel::positionError(QGeoPositionInfoSource::Error e)
@@ -344,9 +330,8 @@ void AppModel::hadError(bool tryAgain)
         d->delayedCityRequestTimer.start();
 }
 
-void AppModel::handleGeoNetworkData(QObject *replyObj)
+void AppModel::handleGeoNetworkData(QNetworkReply *networkReply)
 {
-    QNetworkReply *networkReply = qobject_cast<QNetworkReply*>(replyObj);
     if (!networkReply) {
         hadError(false); // should retry?
         return;
@@ -393,9 +378,8 @@ void AppModel::refreshWeather()
 
     QNetworkReply *rep = d->nam->get(QNetworkRequest(url));
     // connect up the signal right away
-    d->weatherReplyMapper->setMapping(rep, rep);
-    connect(rep, SIGNAL(finished()),
-            d->weatherReplyMapper, SLOT(map()));
+    connect(rep, &QNetworkReply::finished,
+            this, [this, rep]() { handleWeatherNetworkData(rep); });
 }
 
 static QString niceTemperatureString(double t)
@@ -403,10 +387,9 @@ static QString niceTemperatureString(double t)
     return QString::number(qRound(t-ZERO_KELVIN)) + QChar(0xB0);
 }
 
-void AppModel::handleWeatherNetworkData(QObject *replyObj)
+void AppModel::handleWeatherNetworkData(QNetworkReply *networkReply)
 {
     qCDebug(requestsLog) << "got weather network data";
-    QNetworkReply *networkReply = qobject_cast<QNetworkReply*>(replyObj);
     if (!networkReply)
         return;
 
@@ -452,14 +435,13 @@ void AppModel::handleWeatherNetworkData(QObject *replyObj)
 
     QNetworkReply *rep = d->nam->get(QNetworkRequest(url));
     // connect up the signal right away
-    d->forecastReplyMapper->setMapping(rep, rep);
-    connect(rep, SIGNAL(finished()), d->forecastReplyMapper, SLOT(map()));
+    connect(rep, &QNetworkReply::finished,
+            this, [this, rep]() { handleForecastNetworkData(rep); });
 }
 
-void AppModel::handleForecastNetworkData(QObject *replyObj)
+void AppModel::handleForecastNetworkData(QNetworkReply *networkReply)
 {
     qCDebug(requestsLog) << "got forecast";
-    QNetworkReply *networkReply = qobject_cast<QNetworkReply*>(replyObj);
     if (!networkReply)
         return;
 
diff --git a/examples/positioning/weatherinfo/appmodel.h b/examples/positioning/weatherinfo/appmodel.h
index 024f314f..9809284b 100644
--- a/examples/positioning/weatherinfo/appmodel.h
+++ b/examples/positioning/weatherinfo/appmodel.h
@@ -149,10 +149,9 @@ private slots:
     void networkSessionOpened();
     void positionUpdated(QGeoPositionInfo gpsPos);
     void positionError(QGeoPositionInfoSource::Error e);
-    // these would have QNetworkReply* params but for the signalmapper
-    void handleGeoNetworkData(QObject *networkReply);
-    void handleWeatherNetworkData(QObject *networkReply);
-    void handleForecastNetworkData(QObject *networkReply);
+    void handleGeoNetworkData(QNetworkReply *networkReply);
+    void handleWeatherNetworkData(QNetworkReply *networkReply);
+    void handleForecastNetworkData(QNetworkReply *networkReply);
 
 //! [3]
 signals: