Chapter 18. A small wxWidgets program

The code

/*
 * hworld.cpp
 * Hello world sample by Robert Roebling
 * Adapted for unicode by Max Berger
 */
 
#include "wx/wx.h" 
 

class MyApp: public wxApp
{
    virtual bool OnInit();
};

 
class MyFrame: public wxFrame
{
public:
 
    MyFrame(const wxString& title, 
           const wxPoint& pos, const wxSize& size);

    void OnQuit(wxCommandEvent& event);
    void OnAbout(wxCommandEvent& event);
 
    DECLARE_EVENT_TABLE()
};

enum
{
    ID_Quit = 1,
    ID_About,

};
 
BEGIN_EVENT_TABLE(MyFrame, wxFrame)
    EVT_MENU(ID_Quit, MyFrame::OnQuit)
    EVT_MENU(ID_About, MyFrame::OnAbout)
END_EVENT_TABLE()
 
IMPLEMENT_APP(MyApp)

bool MyApp::OnInit()
{
    MyFrame *frame = new MyFrame( wxT("Hello World"), 
         wxPoint(50,50), wxSize(450,340) );
    frame->Show(TRUE);
    SetTopWindow(frame);
    return TRUE;
} 
 
MyFrame::MyFrame(const wxString& title, 
       const wxPoint& pos, const wxSize& size)
: wxFrame((wxFrame *)NULL, -1, title, pos, size)
{
    wxMenu *menuFile = new wxMenu;
    menuFile->Append( ID_About, wxT("&About...") );
    menuFile->AppendSeparator();
    menuFile->Append( ID_Quit, wxT("E&xit") );
 
    wxMenuBar *menuBar = new wxMenuBar;
    menuBar->Append( menuFile, wxT("&File") );
 
    SetMenuBar( menuBar );

    CreateStatusBar();
    SetStatusText( wxT("Welcome to wxWindows!") );
}

 
void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
{
    Close(TRUE);
}
 
void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
{

    wxMessageBox(wxT("This is a wxWindows Hello world sample"),
        wxT("About Hello World"), wxOK | wxICON_INFORMATION, this);
}