***************************************************
* In CentoOs7
***************************************************

sudo yum install gtkmm24-devel.x86_64
sudo yum install gtkmm30-devel.x86_64

g++ -std=c++11 helloworld.cc main.cc  `pkg-config gtkmm-3.0 --cflags --libs`


/* ****************************************** */
/* This File : helloworld.h ***************** */
/* ****************************************** */

#ifndef GTKMM_EXAMPLE_HELLOWORLD_H
#define GTKMM_EXAMPLE_HELLOWORLD_H

#include <gtkmm/button.h>
#include <gtkmm/window.h>

class HelloWorld : public Gtk::Window
{

public:
  HelloWorld();
  virtual ~HelloWorld();

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

  //Member widgets:
  Gtk::Button m_button;
};

#endif // GTKMM_EXAMPLE_HELLOWORLD_H

/* ****************************************** */



/* ****************************************** */
/* This File : helloworld.cc **************** */
/* ****************************************** */

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

HelloWorld::HelloWorld()
: m_button("Hello World")   // creates a new button with label "Hello World".
{
  // Sets the border width of the window.
  set_border_width(10);

  // When the button receives the "clicked" signal, it will call the
  // on_button_clicked() method defined below.
  m_button.signal_clicked().connect(sigc::mem_fun(*this,
              &HelloWorld::on_button_clicked));

  // This packs the button into the Window (a container).
  add(m_button);

  // The final step is to display this newly created widget...
  m_button.show();
}

HelloWorld::~HelloWorld()
{
}

void HelloWorld::on_button_clicked()
{
  std::cout << "Hello World" << std::endl;
}

/* ****************************************** */


/* ****************************************** */
/* This File : main.cc ********************** */
/* ****************************************** */
#include "helloworld.h"
#include <gtkmm/application.h>

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

  HelloWorld helloworld;

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









****************************************************

https://developer.gnome.org/gtkmm-tutorial/stable/sec-basics-simple-example.html.en

****************************************************

sudo apt-get update



sudo apt install at-spi2-core

sudo apt-get install libgtkmm-2.4-dev



sudo apt-get install libgtkmm-3.0-dev




g++ helloworld.cc main.cc  `pkg-config gtkmm-3.0 --cflags --libs`

a.out

****************************************************




****************************************************
* Start Here!!!

https://www.gtkmm.org/en/documentation.html

* **************************************************





https://developer.gnome.org/gtk3/stable/ch01s05.html




GTK is the most stable graphics library

It can be called from just about any language on any platform

Focus on gtk programming

in linux, probably want to install package gtkmm ??