added EnergySaver intended to handle shutdown.

Moved timer from MouseEventSpy to EnergySaver.
Connected MouseEventSpy and MusicController to EnergySaver.

LenaPi/EnergySaver.cpp

@@ -0,0 +1,60 @@
+#include "EnergySaver.h"
+
+#include <QDebug>
+
+EnergySaver::EnergySaver(QObject *parent) : QObject(parent)
+{
+
+}
+
+void EnergySaver::init(int interval)
+{
+    EnergySaver* saver = instance();
+    saver->initTimer(interval);
+    saver->restartTimer();
+}
+
+
+/**
+ * @brief Implements the singleton pattern.
+ * @return Instance
+ *
+ * If no instance has been created yet, create new instance.
+ */
+EnergySaver *EnergySaver::instance()
+{
+    static EnergySaver* inst;
+    if (inst == nullptr)
+    {
+        inst = new EnergySaver();
+    }
+    return inst;
+}
+
+void EnergySaver::restartTimer()
+{
+    if(mTimer.isActive()){
+        mTimer.stop();
+    }
+    mTimer.start();
+}
+
+/**
+ * @brief Initialize and connect timer.
+ * @param interval Timeout interval in millisecond.
+ */
+void EnergySaver::initTimer(int interval)
+{
+    connect(&mTimer, &QTimer::timeout, this, &EnergySaver::onTimeout);
+    mTimer.setInterval(interval);
+    mTimer.setSingleShot(true);
+}
+
+/**
+ * @brief Behavior on timeout: shut down RaspberryPi.
+ * @todo Call shutdown script.
+ */
+void EnergySaver::onTimeout()
+{
+    qDebug() << "shutting down.";
+}

LenaPi/EnergySaver.h

@@ -0,0 +1,30 @@
+#ifndef ENERGYSAVER_H
+#define ENERGYSAVER_H
+
+#include <QObject>
+#include <QTimer>
+
+class EnergySaver : public QObject
+{
+    Q_OBJECT
+
+protected:
+    EnergySaver(QObject *parent = 0);
+
+public:
+    static void init(int intervall);
+    static EnergySaver *instance();
+
+public slots:
+    void restartTimer();
+
+private:
+    void initTimer(int interval);
+    QTimer mTimer;
+
+private slots:
+    void onTimeout();
+
+};
+
+#endif // ENERGYSAVER_H

LenaPi/LenaPi.pro

@@ -11,7 +11,8 @@ SOURCES += main.cpp \
     models/UiStateModel.cpp \
     controllers/MusicController.cpp \
     models/MusicModel.cpp \
-    MouseEventSpy.cpp
+    MouseEventSpy.cpp \
+    EnergySaver.cpp
 
 RESOURCES += qml.qrc \
     lenapi.qrc
@@ -45,6 +46,7 @@ HEADERS += \
     models/UiStateModel.h \
     controllers/MusicController.h \
     models/MusicModel.h \
-    MouseEventSpy.h
+    MouseEventSpy.h \
+    EnergySaver.h
 
 INCLUDEPATH+=/usr/local/include

LenaPi/MouseEventSpy.cpp

@@ -3,18 +3,26 @@
 #include <QGuiApplication>
 #include <QDebug>
 
-/**
- * @brief Initialize timer.
- * @param parent Parent object
- */
 MouseEventSpy::MouseEventSpy(QObject *parent) : QObject(parent)
 {
-    initTimer(10000);
-    mTimer.start();
 }
 
 /**
- * @brief Implements the singleton pattern
+ * @brief Create instance if necessary.
+ *
+ * If no instance has been created yet, create new instance and install it as event filter
+ * in QGuiApplication.
+ *
+ * @see MouseEventSpy::instance()
+ */
+void MouseEventSpy::init()
+{
+    instance();
+}
+
+/**
+ * @brief Implements the singleton pattern.
+ * @return Instance
  *
  * If no instance has been created yet, create new instance and install it as event filter
  * in QGuiApplication.
@@ -45,24 +53,7 @@ bool MouseEventSpy::eventFilter(QObject* watched, QEvent* event)
     {
         emit mouseEventDetected();
     }
-
-        if(mTimer.isActive()){
-            mTimer.stop();
-        }
-        mTimer.start();
-
-        return QObject::eventFilter(watched, event);
-}
-
-/**
- * @brief Initialize and connect timer.
- * @param interval Timeout interval in millisecond.
- */
-void MouseEventSpy::initTimer(int interval)
-{
-    connect(&mTimer, &QTimer::timeout, this, &MouseEventSpy::onTimeout);
-    mTimer.setInterval(interval);
-    mTimer.setSingleShot(true);
+    return QObject::eventFilter(watched, event);
 }
 
 /**
@@ -77,12 +68,3 @@ bool MouseEventSpy::isMouseEvent(QEvent::Type t)
             || t == QEvent::MouseButtonRelease
             || t == QEvent::MouseMove);
 }
-
-/**
- * @brief Behavior on timeout: shut down RaspberryPi.
- * @todo Call shutdown script.
- */
-void MouseEventSpy::onTimeout()
-{
-    qDebug() << "shutting down.";
-}

LenaPi/MouseEventSpy.h

@@ -2,36 +2,34 @@
 #define MOUSEEVENTSPY_H
 
 #include <QObject>
-#include <QTimer>
 #include <QEvent>
 
 /**
- * Catches all mouse event and starts timer -- basically behaves like a screensaver.
-* Based on
-* https://stackoverflow.com/questions/46173105/how-can-i-reset-a-timer-every-time-i-receive-a-touch-event-from-a-qml-page
-*
-* @todo implement timer and behavior on timeout.
-*/
+ * @brief Catches all mouse event and reports them via signal.
+ *
+ * Based on
+ * https://stackoverflow.com/questions/46173105/how-can-i-reset-a-timer-every-time-i-receive-a-touch-event-from-a-qml-page
+ */
 class MouseEventSpy : public QObject
 {
     Q_OBJECT
-public:
+
+protected:
     explicit MouseEventSpy(QObject *parent = 0);
+
+signals:
+    void mouseEventDetected();
+
+public:
+    static void init();
     static MouseEventSpy* instance();
 
 protected:
     bool eventFilter(QObject* watched, QEvent* event);
 
 private:
-    void initTimer(int interval);
     bool isMouseEvent(QEvent::Type t);
-    QTimer mTimer;
 
-private slots:
-    void onTimeout();
-
-signals:
-    void mouseEventDetected();
 };
 
 #endif // MOUSEEVENTSPY_H

LenaPi/controllers/MusicController.cpp

@@ -3,6 +3,7 @@
 #include <QDebug>
 #include <models/MusicModel.h>
 #include <VLCQtCore/MediaPlayer.h>
+#include "EnergySaver.h"
 
 MusicController::MusicController(QObject *parent) : QObject(parent)
 {
@@ -24,6 +25,8 @@ MusicController::MusicController(QObject *parent) : QObject(parent)
     connect(mPlayer, SIGNAL(nextItemSet(VlcMedia*)), mModel, SLOT(onNextMediaSet(VlcMedia*)));
     connect(mPlayer->mediaPlayer(), &VlcMediaPlayer::lengthChanged, mModel, &MusicModel::onLengthChanged);
     connect(mPlayer->mediaPlayer(), &VlcMediaPlayer::timeChanged, mModel, &MusicModel::onTimeChanged);
+
+    connect(mPlayer->mediaPlayer(), &VlcMediaPlayer::timeChanged, EnergySaver::instance(), &EnergySaver::restartTimer);
 }
 
 MusicController::~MusicController()

LenaPi/main.cpp

@@ -2,6 +2,7 @@
 #include <QQmlApplicationEngine>
 #include "controllers/NavigationController.h"
 #include "MouseEventSpy.h"
+#include "EnergySaver.h"
 
 int main(int argc, char *argv[])
 {
@@ -29,8 +30,11 @@ int main(int argc, char *argv[])
     navController.setContext(engine.rootContext());
     navController.init("/home/ar/source/lenaMusic/");
 
-    // install MouseEventSpy used for auto shut down of RaspberryPi if not used for a predefined time.
-    MouseEventSpy::instance();
+    // install MouseEventSpy and energy saver used for auto
+    // shut down of RaspberryPi if not used for a predefined time.
+    MouseEventSpy::init();
+    EnergySaver::init(10000);
+    QObject::connect(MouseEventSpy::instance(), &MouseEventSpy::mouseEventDetected, EnergySaver::instance(), &EnergySaver::restartTimer);
     engine.load(QUrl("qrc:/main.qml"));