wxWidgets Hello World

wxApp.cpp

#include <wx/wxprec.h>

#ifndef WX_PRECOMP
#include <wx/wx.h>
#endif

class App : public wxApp
{
public:
  bool OnInit();
};

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

private:
  void OnExit(wxCommandEvent& event);
  void OnAbout(wxCommandEvent& event);
  void OnHello(wxCommandEvent& event);

  wxDECLARE_EVENT_TABLE();
};

enum { ID_Hello = 1 };

// clang-format off
wxBEGIN_EVENT_TABLE(Frame, wxFrame)
    EVT_MENU(ID_Hello, Frame::OnHello)
    EVT_MENU(wxID_EXIT, Frame::OnExit)
    EVT_MENU(wxID_ABOUT, Frame::OnAbout)
wxEND_EVENT_TABLE()

wxIMPLEMENT_APP(App);
// clang-format on

bool App::OnInit()
{
  Frame* frame = new Frame("Hello World", wxPoint(50, 50), wxSize(450, 340));
  frame->Show(true);
  return true;
}

Frame::Frame(const wxString& title, const wxPoint& pos, const wxSize& size)
    : wxFrame(NULL, wxID_ANY, title, pos, size)
{
  wxMenu* menuFile = new wxMenu();
  menuFile->Append(ID_Hello, "&Hello...\tCtrl-H",
                   "Help string show in status bar");
  menuFile->AppendSeparator();
  menuFile->Append(wxID_EXIT);

  wxMenu* menuHelp = new wxMenu();
  menuHelp->Append(wxID_ABOUT);

  wxMenuBar* menuBar = new wxMenuBar();
  menuBar->Append(menuFile, "&File");
  menuBar->Append(menuHelp, "&Help");

  SetMenuBar(menuBar);
  CreateStatusBar();
  SetStatusText("Welcome to wxWidgets!");
}

void Frame::OnExit(wxCommandEvent& event) { Close(true); }

void Frame::OnAbout(wxCommandEvent& event)
{
  wxMessageBox("This is a wxWidgets' Hello world example", "About Hello World",
               wxOK | wxICON_INFORMATION);
}

void Frame::OnHello(wxCommandEvent& event)
{
  wxLogMessage("Hello World from wxWidgets!");
}