split imageselector

* image updating in seperate class ImageSwitcher
 * image selection in class ImageSelector

src/imageselector.h

@@ -1,26 +1,20 @@
 #ifndef IMAGESELECTOR_H
 #define IMAGESELECTOR_H
 
-#include <QObject>
-#include <QTimer>
 #include <iostream>
-class MainWindow;
-class ImageSelector : public QObject
-{
-    Q_OBJECT
-public:
-    ImageSelector(MainWindow& w, unsigned int timeout, std::string path, bool recursive);
-    void start();
+#include <QStringList>
+
+class MainWindow;
+class ImageSelector
+{
+public:
+    ImageSelector(std::string path, bool recursive);
+    std::string getNextImage() const;
 
-public slots:
-    void updateImage();
 private:
-    QStringList listImagesRecursive();
-    MainWindow& window;
-    unsigned int timeout;
+    QStringList listImagesRecursive() const;
     std::string path;
     bool recursive;
-    QTimer timer;
 };
 
 #endif // IMAGESELECTOR_H