// middle event box
gboolean middle_event_box_button_press(GtkWidget* widget, GdkEventButton* event, gpointer data);
-// top event box
-gboolean top_event_box_button_press(GtkWidget* widget, GdkEventButton* event, gpointer data);
-
// bottom event box
gboolean bottom_event_box_button_press(GtkWidget* widget, GdkEventButton* event, gpointer data);