------------------------- Source Code --------------------------------------------------



// ============================================================================
// declarations
// ============================================================================

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

// For compilers that support precompilation, includes "wx/wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
  #pragma hdrstop
#endif

// for all others, include the necessary headers (this file is usually all you
// need because it includes almost all "standard" wxWindows headers)
#ifndef WX_PRECOMP
  #include "wx/wx.h"
#endif
#include <wx/notebook.h>

// ----------------------------------------------------------------------------
// resources
// ----------------------------------------------------------------------------

// the application icon (under Windows and OS/2 it is in resources)
#if defined(__WXGTK__) || defined(__WXMOTIF__) || defined(__WXMAC__) || defined(__WXMGL__) || defined(__WXX11__)
  #include "mondrian.xpm"
#endif

// ----------------------------------------------------------------------------
// private classes
// ----------------------------------------------------------------------------

// Define a new application type, each program should derive a class from wxApp
class MyApp : public wxApp {
  public:
    // override base class virtuals
    // ----------------------------

    // this one is called on application startup and is a good place for the app
    // initialization (doing it here and not in the ctor allows to have an error
    // return: if OnInit() returns false, the application terminates)
    virtual bool OnInit();
  protected:
  private:
};

class MyDataEntryPanel : public wxPanel {
  public:
    MyDataEntryPanel(wxWindow* parent, wxWindowID id = -1);
    ~MyDataEntryPanel();
  protected:
  private:
};

// Define a new frame type: this is going to be our main frame
class MyFrame : public wxFrame {
  public:
    // ctor(s)
    MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size,
            long style = wxDEFAULT_FRAME_STYLE);
    // dtor
    ~MyFrame();
    // event handlers (these functions should _not_ be virtual)
    void OnQuit(wxCommandEvent& event);
    void OnAbout(wxCommandEvent& event);
  protected:
  private:
    // any class wishing to process wxWindows events must use this macro
    DECLARE_EVENT_TABLE()
    wxNotebookSizer*  m_pNotebookSizer;
    wxBoxSizer*       m_pDataEntrySizer;
    wxPanel*          m_pMainPanel;
    wxNotebook*       m_pNotebook;
    wxNotebookPage*   m_pDataEntryPage;
    MyDataEntryPanel* m_pDataEntryPanel;
};
// ----------------------------------------------------------------------------
// constants
// ----------------------------------------------------------------------------

// IDs for the controls and the menu commands
enum {
  // menu items
  Minimal_Quit = 1,
  // it is important for the id corresponding to the "About" command to have
  // this standard value as otherwise it won't be handled properly under Mac
  // (where it is special and put into the "Apple" menu)
  Minimal_About = wxID_ABOUT
};

// ----------------------------------------------------------------------------
// event tables and other macros for wxWindows
// ----------------------------------------------------------------------------

// the event tables connect the wxWindows events with the functions (event
// handlers) which process them. It can be also done at run-time, but for the
// simple menu events like this the static method is much simpler.
BEGIN_EVENT_TABLE(MyFrame, wxFrame)
  EVT_MENU(Minimal_Quit,  MyFrame::OnQuit)
  EVT_MENU(Minimal_About, MyFrame::OnAbout)
END_EVENT_TABLE()

// Create a new application object: this macro will allow wxWindows to create
// the application object during program execution (it's better than using a
// static object for many reasons) and also declares the accessor function
// wxGetApp() which will return the reference of the right type (i.e. MyApp and
// not wxApp)
IMPLEMENT_APP(MyApp)

// ============================================================================
// implementation
// ============================================================================

// ----------------------------------------------------------------------------
// the application class
// ----------------------------------------------------------------------------

// 'Main program' equivalent: the program execution "starts" here
bool MyApp::OnInit() {
  // create the main application window
  MyFrame *frame = new MyFrame(_T("minimal sample"),
                               wxPoint(50, 50), wxSize(750, 550));

  // and show it (the frames, unlike simple controls, are not shown when
  // created initially)
  frame->Show(TRUE);

  // success: wxApp::OnRun() will be called which will enter the main message
  // loop and the application will run. If we returned FALSE here, the
  // application would exit immediately.
  return TRUE;
}


// ----------------------------------------------------------------------------
// main frame
// ----------------------------------------------------------------------------

// frame constructor
MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size, long style)
       : wxFrame(NULL, -1, title, pos, size, style) {
  // set the frame icon
  SetIcon(wxICON(mondrian));

  #if wxUSE_MENUS
    // create a menu bar
    wxMenu *menuFile = new wxMenu;
  
    // the "About" item should be in the help menu
    wxMenu *helpMenu = new wxMenu;
    helpMenu->Append(Minimal_About, _T("&About...\tF1"), _T("Show about dialog"));
  
    menuFile->Append(Minimal_Quit, _T("E&xit\tAlt-X"), _T("Quit this program"));
  
    // now append the freshly created menu to the menu bar...
    wxMenuBar *menuBar = new wxMenuBar();
    menuBar->Append(menuFile, _T("&File"));
    menuBar->Append(helpMenu, _T("&Help"));
  
    // ... and attach this menu bar to the frame
    SetMenuBar(menuBar);
  #endif // wxUSE_MENUS
  m_pDataEntrySizer = new wxBoxSizer(wxVERTICAL);
  m_pMainPanel      = new wxPanel(this, -1);
  m_pNotebook       = new wxNotebook(m_pMainPanel, -1, wxDefaultPosition, wxSize(740,470), 0, "notebook");
  m_pNotebookSizer  = new wxNotebookSizer(m_pNotebook);
  m_pDataEntryPanel = new MyDataEntryPanel(m_pNotebook);

  m_pNotebook->AddPage(m_pDataEntryPanel, "Enter Data", TRUE);

  m_pDataEntryPanel->SetAutoLayout(TRUE);
  m_pDataEntryPanel->SetSizer(m_pDataEntrySizer);
  #if wxUSE_STATUSBAR
    // create a status bar just for fun (by default with 1 pane only)
    CreateStatusBar();
    SetStatusText(_T("Welcome to wxWidgets"));
  #endif // wxUSE_STATUSBAR
}

MyFrame::~MyFrame() {
  delete m_pNotebookSizer;
  delete m_pDataEntrySizer;
}

// event handlers

void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event)) {
  // TRUE is to force the frame to close
  Close(TRUE);
}

void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event)) {
  wxString msg;
  msg.Printf( _T("This is the About dialog of minimal sample.\n")
              _T("Welcome to %s"), wxVERSION_STRING);

  wxMessageBox(msg, _T("About minimal sample"), wxOK | wxICON_INFORMATION, this);
}

MyDataEntryPanel::MyDataEntryPanel(wxWindow* parent, wxWindowID id) : wxPanel(parent, id) {
}

MyDataEntryPanel::~MyDataEntryPanel() {
}

//--------code snippet--------------------------
class MyFrame : public wxFrame {
  public:
    // ctor(s)
    MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size,
            long style = wxDEFAULT_FRAME_STYLE);
    // dtor
    ~MyFrame();
    // event handlers (these functions should _not_ be virtual)
    void OnQuit(wxCommandEvent& event);
    void OnAbout(wxCommandEvent& event);
  protected:
  private:
    // any class wishing to process wxWindows events must use this macro
    DECLARE_EVENT_TABLE()
    wxPanel*          m_pMainPanel;
    wxNotebook*       m_pNotebook;
    MyDataEntryPanel* m_pDataEntryPanel;
    wxBoxSizer*       m_pTopSizer;
    wxNotebookSizer*  m_pNotebookSizer;
};

MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size, long style)
       : wxFrame(NULL, -1, title, pos, size, style) {
  ...
  m_pMainPanel      = new wxPanel(this, -1);
  m_pNotebook       = new wxNotebook(m_pMainPanel, -1, wxDefaultPosition, wxSize(740,470), 0, "notebook");
  m_pDataEntryPanel = new MyDataEntryPanel(m_pNotebook);
  m_pTopSizer       = new wxBoxSizer(wxVERTICAL);
  m_pNotebookSizer  = new wxNotebookSizer(m_pNotebook);

  m_pNotebook->AddPage(m_pDataEntryPanel, "Enter Data", TRUE);

  m_pTopSizer->Add(m_pNotebookSizer, 1, wxGROW, 5);

  m_pMainPanel->SetAutoLayout(TRUE);
  m_pMainPanel->SetSizer(m_pTopSizer);
  ...
}
//------------------------------------------