moved history navigation to its own class

YACReaderLibrary/yacreader_history_controller.h

@@ -0,0 +1,31 @@
+#ifndef YACREADER_HISTORY_CONTROLLER_H
+#define YACREADER_HISTORY_CONTROLLER_H
+
+#include <QObject>
+
+#include <QModelIndex>
+
+class YACReaderHistoryController : public QObject
+{
+    Q_OBJECT
+public:
+    explicit YACReaderHistoryController(QObject *parent = 0);
+
+signals:
+    void enabledForward(bool enabled);
+    void enabledBackward(bool enabled);
+    void modelIndexSelected(QModelIndex mi);
+
+public slots:
+    void clear();
+    void backward();
+    void forward();
+    void updateHistory(const QModelIndex & mi);
+
+protected:
+    int currentFolderNavigation;
+    QList<QModelIndex> history;
+
+};
+
+#endif // YACREADER_HISTORY_CONTROLLER_H