Dragging Widgets

#include <gtkmm.h>

class ButtonManager
{
public :
    ButtonManager();
    Gtk::Widget* make_button(const Glib::ustring&);
    bool button_press_event(GdkEventButton*);

};

ButtonManager::ButtonManager()
{

}

bool ButtonManager::button_press_event(GdkEventButton* event)
{
    if (event->button == 1) {

    }
    return 1;
}

Gtk::Widget* ButtonManager::make_button(const Glib::ustring& text)
{
    Gtk::Widget *button = new Gtk::Button(text);
    button->add_events(Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON1_MOTION_MASK);
    button->signal_button_press_event().connect(sigc::mem_fun(*this, &ButtonManager::button_press_event));

    return button;
}

int main(int argc, char *argv[])
{
    auto application = Gtk::Application::create(argc, argv, "org.gktmm.drag");
    Gtk::Window *window = new Gtk::Window;
    Gtk::Fixed *fixed = new Gtk::Fixed;
    ButtonManager manager;
    fixed->put(*manager.make_button("A Button"), 50, 50);
    fixed->put(*manager.make_button("Another Button"), 250, 100);
    window->add(*fixed);
    window->show_all_children();
    application->run(*window);
    return 0;
}