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WX
W
IZARD
S
AMPLE
C
ODE
This code is the full listing for the 
wxWizard
example as described in Chapter
12, “Advanced Window Classes.” It can be found in 
examples/chap12
on the
CD-ROM.
Listing J-3 Wizard Sample Code
////////////////////////////////////////////////////////////////////
// Name:        wizard.cpp
// Purpose:     wxWidgets sample demonstrating wxWizard control
// Author:      Vadim Zeitlin
// Licence:     wxWindows licence
////////////////////////////////////////////////////////////////////
// headers
#include “wx/wx.h”
#include “wx/wizard.h”
#include “wiztest.xpm”
#include “wiztest2.xpm”
// constants
// ids for menu items
enum
{
Wizard_Quit = 100,
Wizard_Run,
Wizard_About = 1000
};
// private classes
class MyApp : public wxApp
{
public:
// override base class virtuals
virtual bool OnInit();
};
class MyFrame : public wxFrame
{
public:
// ctor(s)
MyFrame(const wxString& title);
// event handlers
void OnQuit(wxCommandEvent& event);
void OnAbout(wxCommandEvent& event);
void OnRunWizard(wxCommandEvent& event);
void OnWizardCancel(wxWizardEvent& event);
void OnWizardFinished(wxWizardEvent& event);
private:
DECLARE_EVENT_TABLE()
};
wxWizard Sample Code
635
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636
Code Listings Appendix J
Listing J-3 (Continued)
// some pages for our wizard
// this shows how to simply control the validity of the user input
// by just overriding TransferDataFromWindow() - of course, in a
// real program, the check wouldn’t be so trivial and the data
// will be probably saved somewhere too
//
// it also shows how to use a different bitmap for one of the pages
class wxValidationPage : public wxWizardPageSimple
{
public:
wxValidationPage(wxWizard *parent) : wxWizardPageSimple(parent)
{
m_bitmap = wxBitmap(wiztest2_xpm);
m_checkbox = new wxCheckBox(this, wxID_ANY,
wxT(“&Check me”));
wxBoxSizer *mainSizer = new wxBoxSizer(wxVERTICAL);
mainSizer->Add(
new wxStaticText(this, wxID_ANY,
wxT(“You need to check the checkbox\n”)
wxT(“below before going to the next page\n”)),
0,
wxALL,
5
);
mainSizer->Add(
m_checkbox,
0, // No stretching
wxALL,
5 // Border
);
SetSizer(mainSizer);
mainSizer->Fit(this);
}
virtual bool TransferDataFromWindow()
{
if ( !m_checkbox->GetValue() )
{
wxMessageBox(wxT(“Check the checkbox first!”),
wxT(“No way”),
wxICON_WARNING | wxOK, this);
return false;
}
return true;
}
private:
wxCheckBox *m_checkbox;
};
// This is a more complicated example of validity checking:
// using events we may allow the user to return to the previous
// page, but not to proceed. It also demonstrates how to
// intercept a Cancel button press.
class wxRadioboxPage : public wxWizardPageSimple
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{
public:
// directions in which we allow the user to proceed from this page
enum
{
Forward, Backward, Both, Neither
};
wxRadioboxPage(wxWizard *parent) : wxWizardPageSimple(parent)
{
// should correspond to the enum above
static wxString choices[] = { wxT(“forward”), wxT(“backward”),
wxT(“both”), wxT(“neither”) };
m_radio = new wxRadioBox(this, wxID_ANY, wxT(“Allow to proceed:”),
wxDefaultPosition, wxDefaultSize,
WXSIZEOF(choices), choices,
1, wxRA_SPECIFY_COLS);
m_radio->SetSelection(Both);
wxBoxSizer *mainSizer = new wxBoxSizer(wxVERTICAL);
mainSizer->Add(
m_radio,
0, // No stretching
wxALL,
5 // Border
);
SetSizer(mainSizer);
mainSizer->Fit(this);
}
// wizard event handlers
void OnWizardCancel(wxWizardEvent& event)
{
if ( wxMessageBox(wxT(“Do you really want to cancel?”),
wxT(“Question”),
wxICON_QUESTION | wxYES_NO, this) != wxYES )
{
// not confirmed
event.Veto();
}
}
void OnWizardPageChanging(wxWizardEvent& event)
{
int sel = m_radio->GetSelection();
if ( sel == Both )
return;
if ( event.GetDirection() && sel == Forward )
return;
if ( !event.GetDirection() && sel == Backward )
return;
wxMessageBox(wxT(“You can’t go there”), wxT(“Not allowed”),
wxICON_WARNING | wxOK, this);
wxWizard Sample Code
637
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Listing J-3 (Continued)
event.Veto();
}
private:
wxRadioBox *m_radio;
DECLARE_EVENT_TABLE()
};
// this shows how to dynamically (i.e. during run-time) arrange
// the page order
class wxCheckboxPage : public wxWizardPage
{
public:
wxCheckboxPage(wxWizard *parent,
wxWizardPage *prev,
wxWizardPage *next)
: wxWizardPage(parent)
{
m_prev = prev;
m_next = next;
wxBoxSizer *mainSizer = new wxBoxSizer(wxVERTICAL);
mainSizer->Add(
new wxStaticText(this, wxID_ANY, wxT(“Try checking the box
below and\n”)
wxT(“then going back and clearing it”)),
0, // No vertical stretching
wxALL,
5 // Border width
);
m_checkbox = new wxCheckBox(this, wxID_ANY,
wxT(“&Skip the next page”));
mainSizer->Add(
m_checkbox,
0, // No vertical stretching
wxALL,
5 // Border width
);
SetSizer(mainSizer);
mainSizer->Fit(this);
}
// implement wxWizardPage functions
virtual wxWizardPage *GetPrev() const { return m_prev; }
virtual wxWizardPage *GetNext() const
{
return m_checkbox->GetValue() ? m_next->GetNext() : m_next;
}
private:
wxWizardPage *m_prev,
*m_next;
wxCheckBox *m_checkbox;
638
Code Listings Appendix J
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};
// implementation
// event tables and such
BEGIN_EVENT_TABLE(MyFrame, wxFrame)
EVT_MENU(Wizard_Quit,  MyFrame::OnQuit)
EVT_MENU(Wizard_About, MyFrame::OnAbout)
EVT_MENU(Wizard_Run,   MyFrame::OnRunWizard)
EVT_WIZARD_CANCEL(wxID_ANY, MyFrame::OnWizardCancel)
EVT_WIZARD_FINISHED(wxID_ANY, MyFrame::OnWizardFinished)
END_EVENT_TABLE()
BEGIN_EVENT_TABLE(wxRadioboxPage, wxWizardPageSimple)
EVT_WIZARD_PAGE_CHANGING(wxID_ANY,
wxRadioboxPage::OnWizardPageChanging)
EVT_WIZARD_CANCEL(wxID_ANY, wxRadioboxPage::OnWizardCancel)
END_EVENT_TABLE()
IMPLEMENT_APP(MyApp)
// the application class
bool MyApp::OnInit()
{
MyFrame *frame = new MyFrame(wxT(“wxWizard Sample”));
frame->Show(true);
// we’re done
return true;
}
// MyFrame
MyFrame::MyFrame(const wxString& title)
: wxFrame((wxFrame *)NULL, wxID_ANY, title,
wxDefaultPosition, wxSize(250, 150))  // small frame
{
wxMenu *fileMenu = new wxMenu;
fileMenu->Append(Wizard_Run, wxT(“&Run wizard...\tCtrl-R”));
fileMenu->AppendSeparator();
fileMenu->Append(Wizard_Quit, wxT(“E&xit\tAlt-X”), wxT(“Quit this
program”));
wxMenu *helpMenu = new wxMenu;
helpMenu->Append(Wizard_About, wxT(“&About...\tF1”), wxT(“Show about
dialog”));
// now append the freshly created menu to the menu bar...
wxMenuBar *menuBar = new wxMenuBar();
menuBar->Append(fileMenu, wxT(“&File”));
menuBar->Append(helpMenu, wxT(“&Help”));
// ... and attach this menu bar to the frame
SetMenuBar(menuBar);
wxWizard Sample Code
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Listing J-3 (Continued)
// also create status bar which we use in OnWizardCancel
CreateStatusBar();
}
void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
{
// true is to force the frame to close
Close(true);
}
void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
{
wxMessageBox(wxT(“Demo of wxWizard class\n”)
wxT(“(c) 1999, 2000 Vadim Zeitlin”),
wxT(“About wxWizard sample”), wxOK | wxICON_INFORMA-
TION, this);
}
void MyFrame::OnRunWizard(wxCommandEvent& WXUNUSED(event))
{
wxWizard *wizard = new wxWizard(this, wxID_ANY,
wxT(“Absolutely Useless Wizard”),
wxBitmap(wiztest_xpm),
wxDefaultPosition,
wxDEFAULT_DIALOG_STYLE | wxRESIZE_BORDER);
// a wizard page may be either an object of predefined class
wxWizardPageSimple *page1 = new wxWizardPageSimple(wizard);
wxStaticText *text = new wxStaticText(page1, wxID_ANY,
wxT(“This wizard doesn’t help you\nto do anything at all.\n”)
wxT(“\n”)
wxT(“The next pages will present you\nwith more useless con-
trols.”),
wxPoint(5,5)
);
// ... or a derived class
wxRadioboxPage *page3 = new wxRadioboxPage(wizard);
wxValidationPage *page4 = new wxValidationPage(wizard);
// set the page order using a convenience function – could
// also use SetNext/Prev directly as below
wxWizardPageSimple::Chain(page3, page4);
// this page is not a wxWizardPageSimple, so we use SetNext/Prev
// to insert it into the chain of pages
wxCheckboxPage *page2 = new wxCheckboxPage(wizard, page1, page3);
page1->SetNext(page2);
page3->SetPrev(page2);
// allow the wizard to size itself around the pages
wizard->GetPageAreaSizer()->Add(page1);
if ( wizard->RunWizard(page1) )
{
640
Code Listings Appendix J
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wxMessageBox(wxT(“The wizard successfully completed”),
wxT(“That’s all”), wxICON_INFORMATION | wxOK);
}
wizard->Destroy();
}
void MyFrame::OnWizardFinished(wxWizardEvent& WXUNUSED(event))
{
wxLogStatus(this, wxT(“The wizard finished successfully.”));
}
void MyFrame::OnWizardCancel(wxWizardEvent& WXUNUSED(event))
{
wxLogStatus(this, wxT(“The wizard was cancelled.”));
}
wxWizard Sample Code
641
A P P E N D I X
K
Porting from MFC
There are thousands of applications and millions of lines of code written in
MFC, and  it’s  increasingly  common  for  organizations  and  individuals  to
migrate from MFC to wxWidgets to take advantage of other platforms and
markets. Porting is easier than you might think because the wxWidgets API
has many concepts  and  constructs that  are similar  to  those in  MFC. This
appendix gives you an idea of what’s involved, provides comparisons for par-
ticular features, and suggests some porting strategies.
G
ENERAL
O
BSERVATIONS
The processes of programming with MFC and programming with wxWidgets
are fairly similar. In each, you write application, window, and other classes;
create dialogs using suitable tools; define how user interaction relates to code;
and compile and link the code with the GUI library. You can continue to use
(say) Visual Studio to edit, compile, and debug your wxWidgets applications,
using external tools such as DialogBlocks to create your dialogs. Or, you can
use an open source IDE such as Dev-C++ or Eclipse; you can even switch to
Linux or Mac as your main platform.
On Windows, you can combine MFC and wxWidgets code into a single
executable: see 
samples/mfc
in wxWidgets. So if you really need to, you may be
able  to  delay  porting  parts  of  your  code  as  long  as  you  only  need  it  on
Windows. However, the  complexity  and  space  overhead  of  combining  two
frameworks means that a clean break from MFC is a better strategy.
F
EATURE
C
OMPARISON
We continue with a selection of topics to show how MFC constructs can be
ported to wxWidgets.
643
Application Initialization
Like MFC, a wxWidgets application is driven by an application class:
wxApp
instead  of 
CWinApp
. The 
CWinApp::InitInstance
override  is  replaced  by
wxApp::OnInit
,which returns a boolean value to indicate that the event loop
should  be  started. Application  cleanup  is  done in 
wxApp::OnExit
instead  of
CWinApp::ExitInstance
.
wxWidgets  applications  require  the 
IMPLEMENT_APP
declaration  to  be
placed in the application class implementation file, for example:
IMPLEMENT_APP(MyApp)
MFC applications access the command line with the 
m_lpCmdLine
string mem-
ber of 
CWinApp
(or 
GetCommandLine
), whereas in wxWidgets, you access the 
argc
and 
argv
members of 
wxApp
,which are in the same format as the parameters of
the traditional C main function. To help convert your existing command-line
parsing  code, use  the 
wxCmdLineParser
class  explained  in  Chapter  20,
“Perfecting Your Application.”
Message Maps
Where MFC has message maps, wxWidgets uses event tables. (wxWidgets can
also route events dynamically, using a different syntax.) The principle of event
tables should be immediately familiar to MFC programmers. Although mes-
sage  handler  functions  can  have  an  arbitrary  number  of  parameters,
wxWidgets  event  handlers  always  take  a  single  event  argument, through
which information can be  passed in and out of  the  event  handler. As with
MFC,event tables can be placed in a window or in the application class, and in
document and view classes when using the document/view framework. Let’s
compare  an  MFC  message map  with a wxWidgets  event  table. Here’s  the
application class and message map in MFC (note that the class declaration
and message map would normally be in separate files):
//
// MFC message map
//
class CDemoApp: public CWinApp
{
public:
CDemoApp();
// Overrides
virtual BOOL InitInstance();
// Implementation
afx_msg void OnAppAbout();
afx_msg void OnFileSave();
644
Porting from MFC
Appendix K
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