Frame.cpp

#include <wx/app.h>
#include <wx/button.h>
#include <wx/frame.h>
#include <wx/msgdlg.h>
#include <wx/panel.h>

namespace FrameExample {
  class Frame : public wxFrame {
  public:
    Frame() : wxFrame {nullptr, wxID_ANY, "Window example", wxDefaultPosition, {640, 480}} {
      buttonClose->Bind(wxEVT_BUTTON, [&](wxCommandEvent& event) {Close();});
      buttonExit->Bind(wxEVT_BUTTON, [&](wxCommandEvent& event) {wxTheApp->Exit();});
      buttonExitMainLoop->Bind(wxEVT_BUTTON, [&](wxCommandEvent& event) {wxTheApp->ExitMainLoop();});

      Bind(wxEVT_CLOSE_WINDOW, [&](wxCloseEvent& event) {
        auto closed = wxMessageBox("Are you sure you want exit?", "Close Window", wxICON_QUESTION|wxYES_NO) == wxYES;
        event.Veto(!closed);
        event.Skip(closed);
      });
    }

  private:
    wxPanel* panel = new wxPanel {this};
    wxButton* buttonClose = new wxButton {panel, wxID_ANY, "Close", {10, 10}};
    wxButton* buttonExit = new wxButton {panel, wxID_ANY, "Exit", {100, 10}};
    wxButton* buttonExitMainLoop = new wxButton {panel, wxID_ANY, "ExitMainLoop", {190, 10}};
  };

  class Application : public wxApp {
    bool OnInit() override {return (new Frame)->Show();}
  };
}

wxIMPLEMENT_APP(FrameExample::Application);