#include "helloworld.h" #include 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; }