examples: use Qt5-style connects where possible

Additionally, remove obsolete CHECKED_CONNECT macro from
the spectrum example.

Change-Id: Id6fe01718679463c2b025d688c970583d64d60e9
Reviewed-by: VaL Doroshchuk <valentyn.doroshchuk@qt.io>
Reviewed-by: Christian Stromme <christian.stromme@qt.io>

3 files changed, 9 insertions, 9 deletions

diff --git a/examples/multimedia/video/qmlvideo/main.cpp b/examples/multimedia/video/qmlvideo/main.cpp
index a09ea534e..e288c0ae4 100644
--- a/examples/multimedia/video/qmlvideo/main.cpp
+++ b/examples/multimedia/video/qmlvideo/main.cpp
@@ -122,7 +122,7 @@ int main(int argc, char *argv[])
 
     QQuickView viewer;
     viewer.setSource(QUrl("qrc:///qml/qmlvideo/main.qml"));
-    QObject::connect(viewer.engine(), SIGNAL(quit()), &viewer, SLOT(close()));
+    QObject::connect(viewer.engine(), &QQmlEngine::quit, &viewer, &QQuickView::close);
 
     QQuickItem *rootObject = viewer.rootObject();
     rootObject->setProperty("source1", url1);
diff --git a/examples/multimedia/video/qmlvideofx/qmlapplicationviewer/qmlapplicationviewer.cpp b/examples/multimedia/video/qmlvideofx/qmlapplicationviewer/qmlapplicationviewer.cpp
index 33cead8e0..27102b0c5 100644
--- a/examples/multimedia/video/qmlvideofx/qmlapplicationviewer/qmlapplicationviewer.cpp
+++ b/examples/multimedia/video/qmlvideofx/qmlapplicationviewer/qmlapplicationviewer.cpp
@@ -90,7 +90,7 @@ QmlApplicationViewer::QmlApplicationViewer(QWindow *parent)
     : QQuickView(parent)
     , d(new QmlApplicationViewerPrivate(this))
 {
-    connect(engine(), SIGNAL(quit()), QCoreApplication::instance(), SLOT(quit()));
+    connect(engine(), &QQmlEngine::quit, QCoreApplication::instance(), &QCoreApplication::quit);
     setResizeMode(QQuickView::SizeRootObjectToView);
 }
 
@@ -98,7 +98,7 @@ QmlApplicationViewer::QmlApplicationViewer(QQuickView *view, QWindow *parent)
     : QQuickView(parent)
     , d(new QmlApplicationViewerPrivate(view))
 {
-    connect(view->engine(), SIGNAL(quit()), QCoreApplication::instance(), SLOT(quit()));
+    connect(view->engine(), &QQmlEngine::quit, QCoreApplication::instance(), &QCoreApplication::quit);
     view->setResizeMode(QQuickView::SizeRootObjectToView);
 }
 
diff --git a/examples/multimedia/video/snippets/frequencymonitor/frequencymonitor.cpp b/examples/multimedia/video/snippets/frequencymonitor/frequencymonitor.cpp
index fb31c7b1e..d611497fe 100644
--- a/examples/multimedia/video/snippets/frequencymonitor/frequencymonitor.cpp
+++ b/examples/multimedia/video/snippets/frequencymonitor/frequencymonitor.cpp
@@ -105,18 +105,18 @@ FrequencyMonitorPrivate::FrequencyMonitorPrivate(FrequencyMonitor *parent)
 ,   m_stalledTimer(new QTimer(this))
 {
     m_instantaneousElapsed.start();
-    connect(m_averageTimer, SIGNAL(timeout()),
-            this, SLOT(calculateAverageFrequency()));
+    connect(m_averageTimer, &QTimer::timeout,
+            this, &FrequencyMonitorPrivate::calculateAverageFrequency);
     if (DefaultSamplingInterval)
         m_averageTimer->start(DefaultSamplingInterval);
     m_averageElapsed.start();
-    connect(m_traceTimer, SIGNAL(timeout()),
-            q_ptr, SLOT(trace()));
+    connect(m_traceTimer, &QTimer::timeout,
+            q_ptr, &FrequencyMonitor::trace);
     if (DefaultTraceInterval)
         m_traceTimer->start(DefaultTraceInterval);
     m_stalledTimer->setSingleShot(true);
-    connect(m_stalledTimer, SIGNAL(timeout()),
-            this, SLOT(stalled()));
+    connect(m_stalledTimer, &QTimer::timeout,
+            this, &FrequencyMonitorPrivate::stalled);
 }
 
 void FrequencyMonitorPrivate::calculateInstantaneousFrequency()