add QSettings for config parsing

LenaPi/main.cpp

@@ -1,39 +1,46 @@
 #include <QGuiApplication>
 #include <QQmlApplicationEngine>
+#include <QSettings>
 #include "controllers/NavigationController.h"
 #include "MouseEventSpy.h"
 #include "EnergySaver.h"
 
 int main(int argc, char *argv[])
 {
-    /**
+    /*
      * @todo Add command line parser to specify a custom config file
      * https://doc.qt.io/qt-5/qcommandlineparser.html
-     * Add config handling https://doc.qt.io/qt-5/qsettings.html#QSettings-4
-     * - set root path
-     * ui mode -> pass to NavigationController and store in UiStateModel
-     * - set mode
-     * -- RasPi -> no volumeControl or exit Button
-     * -- Desktop -> volumeControl and exit Button
-     * -- in future probably also MobileApp
-     * Energy saving options -> hand over to energy saver on initialization
-     * - enable energy saving
-     * - set energy saver timeout
-     * - set shutdown script path
      */
     QGuiApplication app(argc, argv);
     QQmlApplicationEngine engine;
 
+    /* Read Settings */
+    QSettings settings("me", "LenaPi");
+    const auto rootPath = settings.value("rootPath", "/home/ar/source/lenaMusic/").toString(); // path to music files
+    const auto profile = settings.value("profile", "RasPiTouch").toString(); // known modes are "RasPiTouch" and "Desktop"
+    const auto isEnergySavingEnabled = settings.value("enableEnergySaver", true).toBool(); // enable/disable energy saver
+    const auto energySaverTimeout = settings.value("timeout", 60).toInt(); //timeout in seconds
+    const auto shutdownScript = settings.value("shutdownScript", "/usr/local/sbin/do_shutdown.sh").toString();
+
+    /* @todo Hand over profile to UiStateModel via NavigationController
+     * Add properties to UiStateModel for showing volume controls and close button.
+     * Set those properties according to profile and use them to hide/show elements in qml
+     */
     NavigationController navController;
     navController.setContext(engine.rootContext());
-    navController.init("/home/ar/source/lenaMusic/");
+    navController.init(rootPath);
 
-    // install MouseEventSpy and energy saver used for auto
-    // shut down of RaspberryPi if not used for a predefined time.
-    MouseEventSpy::init();
-    EnergySaver::init(10);
-    QObject::connect(MouseEventSpy::instance(), &MouseEventSpy::mouseEventDetected,
-                     EnergySaver::instance(), &EnergySaver::restartTimer);
+    if(isEnergySavingEnabled){
+        /* install MouseEventSpy and energy saver used for auto shut down of device
+         *  if not used for a predefined time.
+         */
+        MouseEventSpy::init();
+        EnergySaver::init(energySaverTimeout, shutdownScript);
+        QObject::connect(MouseEventSpy::instance(), &MouseEventSpy::mouseEventDetected,
+                         EnergySaver::instance(), &EnergySaver::restartTimer);
+    }
+
+    // load GUI
     engine.load(QUrl("qrc:/main.qml"));