#1 Move UI to classes

src/ui/common/closebutton.cpp

@@ -0,0 +1,15 @@
+#include "closebutton.h"
+
+#include <gtkmm.h>
+
+CloseButton::CloseButton(const Glib::ustring &label, Glib::RefPtr<Gtk::Application> appPtr) : app(appPtr)
+{
+  set_label(label);
+
+  signal_clicked().connect(sigc::mem_fun(*this, &CloseButton::on_button_clicked));
+}
+
+void CloseButton::on_button_clicked()
+{
+  this->app.get()->quit();
+}