InfoBar
| Chapter 7. Miscellaneous Widgets |

## InfoBar

An `InfoBar` may show small items of information or ask brief questions. Unlike a `Dialog`, it appears at the top of the current window instead of opening a new window. Its API is very similar to the Gtk::Dialog API.

Reference

### Example

Figure 7.8. InfoBar

Source Code

File: `examplewindow.h` (For use with gtkmm 3, not gtkmm 2)

    #ifndef GTKMM_EXAMPLEWINDOW_H
    #define GTKMM_EXAMPLEWINDOW_H

    #include <gtkmm.h>

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

    protected:
      //Signal handlers:
      void on_infobar_response(int response);
      void on_button_quit();
      void on_button_clear();
      void on_textbuffer_changed();

      //Child widgets:
      Gtk::Box m_VBox;

      Gtk::ScrolledWindow m_ScrolledWindow;
      Gtk::TextView m_TextView;

      Glib::RefPtr<Gtk::TextBuffer> m_refTextBuffer;

      Gtk::InfoBar m_InfoBar;
      Gtk::Label m_Message_Label;

      Gtk::ButtonBox m_ButtonBox;
      Gtk::Button m_Button_Quit, m_Button_Clear;
    };

    #endif //GTKMM_EXAMPLEWINDOW_H

File: `main.cc` (For use with gtkmm 3, not gtkmm 2)

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

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

      ExampleWindow window;
      //Shows the window and returns when it is closed.
      return app->run(window);
    }

File: `examplewindow.cc` (For use with gtkmm 3, not gtkmm 2)

    #include "examplewindow.h"

    ExampleWindow::ExampleWindow()
    : m_VBox(Gtk::ORIENTATION_VERTICAL, 6),
      m_Button_Quit("_Quit", true),
      m_Button_Clear("_Clear", true)
    {
      set_title("Gtk::InfoBar example");
      set_border_width(6);
      set_default_size(400, 200);

      add(m_VBox);

      // Add the message label to the InfoBar:
      auto infoBarContainer =
        dynamic_cast<Gtk::Container*>(m_InfoBar.get_content_area());
      if (infoBarContainer)
        infoBarContainer->add(m_Message_Label);

      // Add an ok button to the InfoBar:
      m_InfoBar.add_button("_OK", 0);

      // Add the InfoBar to the vbox:
      m_VBox.pack_start(m_InfoBar, Gtk::PACK_SHRINK);

      // Create the buffer and set it for the TextView:
      m_refTextBuffer = Gtk::TextBuffer::create();
      m_TextView.set_buffer(m_refTextBuffer);

      // Add the TreeView, inside a ScrolledWindow:
      m_ScrolledWindow.add(m_TextView);

      // Show the scrollbars only when they are necessary:
      m_ScrolledWindow.set_policy(Gtk::POLICY_AUTOMATIC, Gtk::POLICY_AUTOMATIC);

      m_VBox.pack_start(m_ScrolledWindow);

      // Add button box:
      m_VBox.pack_start(m_ButtonBox, Gtk::PACK_SHRINK);

      m_ButtonBox.pack_start(m_Button_Clear, Gtk::PACK_SHRINK);
      m_ButtonBox.pack_start(m_Button_Quit, Gtk::PACK_SHRINK);
      m_ButtonBox.set_spacing(6);
      m_ButtonBox.set_layout(Gtk::BUTTONBOX_END);

      // Connect signals:
      m_InfoBar.signal_response().connect(sigc::mem_fun(*this,
                  &ExampleWindow::on_infobar_response) );
      m_Button_Quit.signal_clicked().connect(sigc::mem_fun(*this,
                  &ExampleWindow::on_button_quit) );
      m_Button_Clear.signal_clicked().connect(sigc::mem_fun(*this,
                  &ExampleWindow::on_button_clear) );
      m_refTextBuffer->signal_changed().connect(sigc::mem_fun(*this,
                  &ExampleWindow::on_textbuffer_changed) );

      show_all();

      // Keep the InfoBar hidden until a message needs to be shown:
      m_InfoBar.hide();

      // Make the clear button insensitive until text is typed in the buffer.  When
      // the button is sensitive and it is pressed, the InfoBar is displayed with a
      // message.
      m_Button_Clear.set_sensitive(false);
    }

    ExampleWindow::~ExampleWindow()
    {
    }

    void ExampleWindow::on_infobar_response(int)
    {
      // Clear the message and hide the info bar:
      m_Message_Label.set_text("");
      m_InfoBar.hide();
    }

    void ExampleWindow::on_button_quit()
    {
      hide();
    }

    void ExampleWindow::on_button_clear()
    {
      m_refTextBuffer->set_text("");
      m_Message_Label.set_text("Cleared the text.");
      m_InfoBar.set_message_type(Gtk::MESSAGE_INFO);
      m_InfoBar.show();
    }

    void ExampleWindow::on_textbuffer_changed()
    {
      m_Button_Clear.set_sensitive(m_refTextBuffer->size() > 0);
    }

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