added new view for empty folders in YACReaderLibrary that shows a list with all the subfolders

TODO ?use a special case for the root folder?

YACReaderLibrary/empty_folder_widget.h

@@ -0,0 +1,32 @@
+#ifndef EMPTY_FOLDER_WIDGET_H
+#define EMPTY_FOLDER_WIDGET_H
+
+#include <QWidget>
+#include <QModelIndex>
+
+class QLabel;
+class QListView;
+class QStringListModel;
+
+class EmptyFolderWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    explicit EmptyFolderWidget(QWidget *parent = 0);
+    void setSubfolders(const QModelIndex & mi, const QStringList & foldersNames);
+signals:
+    void subfolderSelected(QModelIndex, int);
+
+public slots:
+    void onItemClicked(const QModelIndex & mi);
+
+protected:
+    QLabel * iconLabel;
+    QLabel * titleLabel;
+    QListView * foldersView;
+    QModelIndex parent;
+    QStringListModel * subfoldersModel;
+    void paintEvent(QPaintEvent *);
+};
+
+#endif // EMPTY_FOLDER_WIDGET_H