Simple String Example
| Chapter 12. The DropDown Widget |

## Simple String Example

Figure 12.1. Simple DropDown

Source Code

File: `examplewindow.h` (For use with gtkmm 4)

    #ifndef GTKMM_EXAMPLEWINDOW_H
    #define GTKMM_EXAMPLEWINDOW_H

    #include <gtkmm/window.h>
    #include <gtkmm/dropdown.h>
    #include <gtkmm/stringlist.h>

    class ExampleWindow : public Gtk::Window
    {
    public:
      ExampleWindow();
      ~ExampleWindow() override;

    protected:
      // Signal handler:
      void on_dropdown_changed();

      // Child widget:
      Gtk::DropDown m_DropDown;

      Glib::RefPtr<Gtk::StringList> m_StringList;
    };

    #endif //GTKMM_EXAMPLEWINDOW_H

File: `examplewindow.cc` (For use with gtkmm 4)

    #include "examplewindow.h"
    #include <iostream>

    ExampleWindow::ExampleWindow()
    {
      set_title("DropDown example");

      set_child(m_DropDown);

      // Fill the dropdown:
      const std::vector<Glib::ustring> strings{
        "1 minute", "2 minutes", "5 minutes", "20 minutes"
      };
      m_StringList = Gtk::StringList::create(strings);
      m_DropDown.set_model(m_StringList);
      m_DropDown.set_selected(0);

      // Connect signal handler:
      m_DropDown.property_selected().signal_changed().connect(
        sigc::mem_fun(*this, &ExampleWindow::on_dropdown_changed));
    }

    ExampleWindow::~ExampleWindow()
    {
    }

    void ExampleWindow::on_dropdown_changed()
    {
      const auto selected = m_DropDown.get_selected();
      std::cout << "DropDown changed: Row=" << selected
        << ", String=" << m_StringList->get_string(selected) << std::endl;
    }

File: `main.cc` (For use with gtkmm 4)

    #include "examplewindow.h"
    #include <gtkmm/application.h>

    int main(int argc, char* argv[])
    {
      auto app = Gtk::Application::create("org.gtkmm.example");

      // Shows the window and returns when it is closed.
      return app->make_window_and_run<ExampleWindow>(argc, argv);
    }

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