ColorSelectionDialog
| Chapter 16. Dialogs |

## ColorSelectionDialog

The `ColorSelectionDialog` allows the user to choose a color. The `ColorButton` opens a color selection dialog when it is clicked.

Reference

### Example

Figure 16.3. ColorSelectionDialog

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_color_button_color_set();
      void on_button_dialog_clicked();

      //Child widgets:
      Gtk::Box m_VBox;
      Gtk::ColorButton m_ColorButton;
      Gtk::Button m_Button_Dialog;
      Gtk::DrawingArea m_DrawingArea; //To show the color.

      Gdk::RGBA m_Color;
    };

    #endif //GTKMM_EXAMPLEWINDOW_H

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

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

    ExampleWindow::ExampleWindow()
    : m_VBox(Gtk::ORIENTATION_VERTICAL, 5),
      m_Button_Dialog("Choose Color")
    {
      set_title("Gtk::ColorSelectionDialog example");
      set_default_size(200, 200);

      add(m_VBox);

      m_VBox.pack_start(m_ColorButton, Gtk::PACK_SHRINK);
      m_ColorButton.signal_color_set().connect(sigc::mem_fun(*this,
        &ExampleWindow::on_color_button_color_set) );

      m_VBox.pack_start(m_Button_Dialog, Gtk::PACK_SHRINK);
      m_Button_Dialog.signal_clicked().connect(sigc::mem_fun(*this,
        &ExampleWindow::on_button_dialog_clicked) );

      //Set start color:
      m_Color.set_red(0.0);
      m_Color.set_green(0.0);
      m_Color.set_blue(1.0);
      m_Color.set_alpha(1.0); //opaque
      m_ColorButton.set_rgba(m_Color);

      m_DrawingArea.override_background_color(m_Color);

      m_VBox.pack_start(m_DrawingArea);

      show_all_children();
    }

    ExampleWindow::~ExampleWindow()
    {
    }

    void ExampleWindow::on_color_button_color_set()
    {
      //Store the chosen color, and show it:
      m_Color = m_ColorButton.get_rgba();
      m_DrawingArea.override_background_color(m_Color);
    }

    void ExampleWindow::on_button_dialog_clicked()
    {
      Gtk::ColorSelectionDialog dialog("Please choose a color");
      dialog.set_transient_for(*this);

      //Get the previously selected color:
      dialog.get_color_selection()->set_current_rgba(m_Color);

      int result = dialog.run();

      //Handle the response:
      switch(result)
      {
        case Gtk::RESPONSE_OK:
        {
          //Store the chosen color, and show it:
          m_Color = dialog.get_color_selection()->get_current_rgba();
          m_ColorButton.set_rgba(m_Color);
          m_DrawingArea.override_background_color(m_Color);
          break;
        }
        case Gtk::RESPONSE_CANCEL:
        {
          std::cout << "Cancel clicked." << std::endl;
          break;
        }
        default:
        {
          std::cout << "Unexpected button clicked: " << result << std::endl;
          break;
        }
      }
    }

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

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

    int main(int argc, char *argv[])
    {
      Gtk::Main kit(argc, argv);

      ExampleWindow window;
      //Shows the window and returns when it is closed.
      Gtk::Main::run(window);

      return 0;
    }

FileChooserDialog |  | FontChooserDialog