some more thoughts about settings widgets

ui/widgets/settings/settings.h

@@ -2,6 +2,7 @@
 #define SETTINGS_H
 
 #include <QWidget>
+#include <QListWidgetItem>
 #include <QScopedPointer>
 
 namespace Ui
@@ -19,6 +20,9 @@ public:
     Settings(QWidget* parent = nullptr);
     ~Settings();
 
+protected slots:
+    void onCurrentPageChanged(QListWidgetItem* current);
+
 private:
     QScopedPointer<Ui::Settings> m_ui;
 };