Source Code

File: examplewindow.h

#ifndef GTKMM_EXAMPLEWINDOW_H
#define GTKMM_EXAMPLEWINDOW_H

#include <gtkmm.h>

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

protected:
  //Signal handlers:
  virtual void on_button_clicked();

  //Child widgets:
  Gtk::VBox m_VBox;
  Gtk::Button m_Button;
  Gtk::DrawingArea m_DrawingArea; //To show the color.

  Gdk::Color m_Color;
};

#endif //GTKMM_EXAMPLEWINDOW_H

File: examplewindow.cc

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


ExampleWindow::ExampleWindow()
: m_Button("Show Dialog")
{
  set_title("Gtk::ColorSelectionDialog example");
  set_default_size(200, 200);
  
  add(m_VBox);
  
  m_VBox.pack_start(m_Button, Gtk::PACK_SHRINK);
  m_Button.signal_clicked().connect( SigC::slot(*this, &ExampleWindow::on_button_clicked) );

  //Set start color:
  m_Color.set_red(0);
  m_Color.set_blue(65535);
  m_Color.set_green(0);
  m_DrawingArea.modify_bg(Gtk::STATE_NORMAL, m_Color);
  
  m_VBox.pack_start(m_DrawingArea);
  
  show_all_children();
}

ExampleWindow::~ExampleWindow()
{
}

void ExampleWindow::on_button_clicked()
{
  Gtk::ColorSelectionDialog dialog;

  //Set the current color:
  Gtk::ColorSelection* pColorSel = dialog.get_colorsel();
  pColorSel->set_current_color(m_Color);
  
  int result = dialog.run();
  
  //Handle the response:
  switch(result)
  {
    case(Gtk::RESPONSE_OK):
    {
      //Store the chosen color, and show it:
      m_Color = pColorSel->get_current_color();
      m_DrawingArea.modify_bg(Gtk::STATE_NORMAL, m_Color);
      break;
    }
    case(Gtk::RESPONSE_CANCEL):
    {
      std::cout << "Cancel clicked." << std::endl;
      break;
    }
    default:
    {
      std::cout << "Unexpected button clicked." << std::endl;
      break;
    }
  }
}

File: main.cc

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

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

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

  return 0;
}