///////////////////////////////////////////////////////////////////////////// // Name: xti.cpp // Purpose: eXtended RTTI support sample // Author: Stefan Csomor, Francesco Montorsi // Modified by: // Created: 13/5/2007 // Copyright: (c) Stefan Csomor, Francesco Montorsi // Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// // ============================================================================ // declarations // ============================================================================ // ---------------------------------------------------------------------------- // headers // ---------------------------------------------------------------------------- // For compilers that support precompilation, includes "wx/wx.h". #include "wx/wxprec.h" // for all others, include the necessary headers (this file is usually all you // need because it includes almost all "standard" wxWidgets headers) #ifndef WX_PRECOMP #include "wx/wx.h" #endif #include "wx/wx.h" #include "wx/variant.h" #include "wx/xml/xml.h" #include "wx/frame.h" #include "wx/notebook.h" #include "wx/event.h" #include "wx/spinbutt.h" #include "wx/spinctrl.h" #include "wx/xtistrm.h" #include "wx/xtixml.h" #include "wx/txtstrm.h" #include "wx/wfstream.h" #include "wx/sstream.h" #include "wx/spinctrl.h" #include "classlist.h" #include "codereadercallback.h" #if !wxUSE_EXTENDED_RTTI #error This sample requires XTI (eXtended RTTI) enabled #endif // ---------------------------------------------------------------------------- // resources // ---------------------------------------------------------------------------- #ifndef wxHAS_IMAGES_IN_RESOURCES #include "../sample.xpm" #endif // ---------------------------------------------------------------------------- // private classes // ---------------------------------------------------------------------------- // Define a new application type, each program should derive a class from wxApp class MyApp : public wxApp { public: virtual bool OnInit(); }; // Define a new frame type: this is going to be our main frame class MyFrame : public wxFrame { public: // ctor(s) MyFrame(const wxString& title); void OnPersist(wxCommandEvent& event); void OnDepersist(wxCommandEvent& event); void OnGenerateCode(wxCommandEvent& event); void OnDumpClasses(wxCommandEvent& event); void OnQuit(wxCommandEvent& event); void OnAbout(wxCommandEvent& event); private: // any class wishing to process wxWidgets events must use this macro wxDECLARE_EVENT_TABLE(); }; // ---------------------------------------------------------------------------- // constants // ---------------------------------------------------------------------------- // IDs for the controls and the menu commands enum { // menu items Minimal_Persist = wxID_HIGHEST, Minimal_Depersist, Minimal_GenerateCode, Minimal_DumpClasses, Minimal_Quit = wxID_EXIT, Minimal_About = wxID_ABOUT }; // ---------------------------------------------------------------------------- // event tables and other macros for wxWidgets // ---------------------------------------------------------------------------- wxBEGIN_EVENT_TABLE(MyFrame, wxFrame) EVT_MENU(Minimal_Persist, MyFrame::OnPersist) EVT_MENU(Minimal_Depersist, MyFrame::OnDepersist) EVT_MENU(Minimal_GenerateCode, MyFrame::OnGenerateCode) EVT_MENU(Minimal_DumpClasses, MyFrame::OnDumpClasses) EVT_MENU(Minimal_Quit, MyFrame::OnQuit) EVT_MENU(Minimal_About, MyFrame::OnAbout) wxEND_EVENT_TABLE() wxIMPLEMENT_APP(MyApp); // ============================================================================ // implementation // ============================================================================ void RegisterFrameRTTI(); // ---------------------------------------------------------------------------- // the application class // ---------------------------------------------------------------------------- bool MyApp::OnInit() { if ( !wxApp::OnInit() ) return false; RegisterFrameRTTI(); // create the main application window MyFrame *frame = new MyFrame("Extended RTTI sample"); // 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 // ---------------------------------------------------------------------------- MyFrame::MyFrame(const wxString& title) : wxFrame(NULL, wxID_ANY, title, wxDefaultPosition, wxSize(300, 200)) { // set the frame icon SetIcon(wxICON(sample)); #if wxUSE_MENUS // create a menu bar wxMenu *fileMenu = new wxMenu; // the "About" item should be in the help menu wxMenu *helpMenu = new wxMenu; helpMenu->Append(Minimal_About, "&About\tF1", "Show about dialog"); fileMenu->Append(Minimal_Persist, "Persist a wxFrame to XML...", "Creates a wxFrame using wxXTI and saves its description as XML"); fileMenu->Append(Minimal_Depersist, "Depersist XML file...", "Loads the description of wxFrame from XML"); fileMenu->Append(Minimal_GenerateCode, "Generate code for a wxFrame saved to XML...", "Generates the C++ code which belong to a persisted wxFrame"); fileMenu->AppendSeparator(); fileMenu->Append(Minimal_DumpClasses, "Dump registered classes...", "Dumps the description of all wxWidgets classes registered in XTI"); fileMenu->AppendSeparator(); fileMenu->Append(Minimal_Quit, "E&xit\tAlt-X", "Quit this program"); // now append the freshly created menu to the menu bar... wxMenuBar *menuBar = new wxMenuBar(); menuBar->Append(fileMenu, "&File"); menuBar->Append(helpMenu, "&Help"); // ... and attach this menu bar to the frame SetMenuBar(menuBar); #endif // wxUSE_MENUS #if wxUSE_STATUSBAR // create a status bar just for fun (by default with 1 pane only) CreateStatusBar(2); SetStatusText("Welcome to wxWidgets!"); #endif // wxUSE_STATUSBAR } // ---------------------------------------------------------------------------- // XTI sample code // ---------------------------------------------------------------------------- // this is the kind of source code that would end up being generated by a // designer corresponding to the information we are setting up via RTTI // in the CreateFrameRTTI function: // // class MyXTIFrame : public wxFrame // { // public: // // construction // MyXTIFrame() // { // Init(); // m_button = NULL; // } // // bool Create(wxWindow *parent, // wxWindowID id, // const wxString& title, // const wxPoint& pos = wxDefaultPosition, // const wxSize& size = wxDefaultSize, // long style = wxDEFAULT_FRAME_STYLE, // const wxString& name = wxFrameNameStr) // { // return wxFrame::Create( parent, id, title, pos, size, style, name ); // } // // void SetButton( wxButton * button ) { m_button = button; } // wxButton* GetButton() const { return m_button; } // // void ButtonClickHandler( wxEvent & WXUNUSED(event) ) // { // wxMessageBox( "Button Clicked ", "Hi!", wxOK ); // } // // protected: // wxButton* m_button; // // wxDECLARE_EVENT_TABLE(); // wxDECLARE_DYNAMIC_CLASS_NO_COPY(MyXTIFrame); // }; // // wxIMPLEMENT_DYNAMIC_CLASS_XTI(MyXTIFrame, MyXTIFrame, "x.h"); // // WX_BEGIN_PROPERTIES_TABLE(MyXTIFrame) // WX_PROPERTY( Button, wxButton*, SetButton, GetButton, ) // WX_END_PROPERTIES_TABLE() // // WX_BEGIN_HANDLERS_TABLE(MyXTIFrame) // WX_HANDLER( ButtonClickHandler, wxCommandEvent ) // WX_END_HANDLERS_TABLE() // // WX_CONSTRUCTOR_5( MyXTIFrame, wxWindow*, Parent, wxWindowID, Id, // wxString, Title, wxPoint, Position, wxSize, Size ) // // wxBEGIN_EVENT_TABLE(MyXTIFrame, wxFrame) // wxEND_EVENT_TABLE() // the following class "persists" (i.e. saves) a wxFrame into a wxObjectWriter class MyDesignerPersister : public wxObjectWriterCallback { public: MyDesignerPersister( wxDynamicObject * frame) { m_frame = frame; } virtual bool BeforeWriteDelegate( wxObjectWriter *WXUNUSED(writer), const wxObject *object, const wxClassInfo* WXUNUSED(classInfo), const wxPropertyInfo *propInfo, const wxObject *&eventSink, const wxHandlerInfo* &handlerInfo ) { // this approach would be used if the handler would not // be connected really in the designer, so we have to supply // the information const wxObject* but = wxAnyGetAsObjectPtr( m_frame->GetProperty(wxT("Button")) ); if ( object == but && propInfo == wxCLASSINFO( wxButton )->FindPropertyInfo(wxT("OnClick")) ) { eventSink = m_frame; handlerInfo = m_frame->GetClassInfo()-> FindHandlerInfo(wxT("ButtonClickHandler")); return true; } return false; } private: wxDynamicObject *m_frame; }; // sometimes linkers (at least MSVC and GCC ones) optimize the final EXE // even in debug mode pruning the object files which he "thinks" are useless; // thus the classes defined in those files won't be available in the XTI // table and the program will fail to allocate them. // The following macro implements a simple hack to ensure that a given // class is linked in. // // TODO: in wx/link.h there are already similar macros (also more "optimized": // don't need the creation of fake object) which however require to use // the wxFORCE_LINK_THIS_MODULE() macro inside the source files corresponding // to the class being discarded. // #define wxENSURE_CLASS_IS_LINKED(x) { x test; } void RegisterFrameRTTI() { // set up the RTTI info for a class (MyXTIFrame) which // is not defined anywhere in this program wxDynamicClassInfo *dyninfo = wx_dynamic_cast( wxDynamicClassInfo *, wxClassInfo::FindClass("MyXTIFrame")); if ( dyninfo == NULL ) { dyninfo = new wxDynamicClassInfo(wxT("myxtiframe.h"), wxT("MyXTIFrame"), CLASSINFO(wxFrame) ); // this class has a property named "Button" and the relative handler: dyninfo->AddProperty(wxT("Button"), wxGetTypeInfo((wxButton**) NULL)); dyninfo->AddHandler(wxT("ButtonClickHandler"), NULL /* no instance of the handler method */, CLASSINFO( wxEvent ) ); } } wxDynamicObject* CreateFrameRTTI() { int baseID = 100; wxAny Params[10]; // the class is now part of XTI internal table so that we can // get a pointer to it just searching it like any other class: wxFrame* frame; wxClassInfo *info = wxClassInfo::FindClass("MyXTIFrame"); wxASSERT( info ); wxDynamicObject* frameWrapper = wx_dynamic_cast(wxDynamicObject*, info->CreateObject() ); Params[0] = wxAny((wxWindow*)(NULL)); Params[1] = wxAny(wxWindowID(baseID++)); Params[2] = wxAny(wxString("This is a frame created from XTI")); Params[3] = wxAny(wxPoint(-1,-1)); Params[4] = wxAny(wxSize(400,300)); Params[5] = wxAny((long)wxDEFAULT_FRAME_STYLE); wxASSERT( info->Create(frameWrapper, 6, Params )); frame = wx_dynamic_cast(wxFrame*, frameWrapper->GetSuperClassInstance()); #if 1 // now build a notebook inside it: wxNotebook* notebook; info = wxClassInfo::FindClass("wxNotebook"); wxASSERT( info ); notebook = wxDynamicCast( info->CreateObject(), wxNotebook ); Params[0] = wxAny((wxWindow*)frame); Params[1] = wxAny(wxWindowID(baseID++)); Params[2] = wxAny(wxPoint( 10, 10 )); Params[3] = wxAny(wxDefaultSize); Params[4] = wxAny((long)0); wxASSERT( info->Create(notebook, 5, Params )); // button page wxPanel* panel; info = wxClassInfo::FindClass("wxPanel"); wxASSERT( info ); panel = wxDynamicCast( info->CreateObject(), wxPanel ); Params[0] = wxAny((wxWindow*)(notebook)); Params[1] = wxAny(wxWindowID(baseID++)); Params[2] = wxAny(wxPoint(-1,-1)); Params[3] = wxAny(wxSize(-1,-1)); Params[4] = wxAny((long)0); Params[5] = wxAny(wxString("Hello")); wxASSERT( info->Create(panel, 6, Params )); notebook->AddPage( panel, "Buttons" ); wxButton* button; info = wxClassInfo::FindClass("wxButton"); wxASSERT( info ); button = wxDynamicCast( info->CreateObject(), wxButton ); Params[0] = wxAny((wxWindow*)(panel)); Params[1] = wxAny(wxWindowID(baseID++)); Params[2] = wxAny(wxString("Click Me!")); Params[3] = wxAny(wxPoint( 10, 10 )); Params[4] = wxAny(wxSize(-1,-1)); Params[5] = wxAny((long)0); wxASSERT( info->Create(button, 6, Params )); frameWrapper->SetProperty( wxT("Button"), wxAny( button ) ); // other controls page info = wxClassInfo::FindClass("wxPanel"); wxASSERT( info ); panel = wxDynamicCast( info->CreateObject(), wxPanel ); Params[0] = wxAny((wxWindow*)(notebook)); Params[1] = wxAny(wxWindowID(baseID++)); Params[2] = wxAny(wxPoint(-1,-1)); Params[3] = wxAny(wxSize(-1,-1)); Params[4] = wxAny((long)0); Params[5] = wxAny(wxString("Hello")); wxASSERT( info->Create(panel, 6, Params )); notebook->AddPage( panel, "Other Standard controls" ); wxControl* control; info = wxClassInfo::FindClass("wxCheckBox"); wxASSERT( info ); control = wxDynamicCast( info->CreateObject(), wxControl ); Params[0] = wxAny((wxWindow*)(panel)); Params[1] = wxAny(wxWindowID(baseID++)); Params[2] = wxAny(wxString("A Checkbox")); Params[3] = wxAny(wxPoint( 10, 10 )); Params[4] = wxAny(wxSize(-1,-1)); Params[5] = wxAny((long)0); wxASSERT( info->Create(control, 6, Params )); info = wxClassInfo::FindClass("wxRadioButton"); wxASSERT( info ); control = wxDynamicCast( info->CreateObject(), wxControl ); Params[0] = wxAny((wxWindow*)(panel)); Params[1] = wxAny(wxWindowID(baseID++)); Params[2] = wxAny(wxString("A Radiobutton")); Params[3] = wxAny(wxPoint( 10, 30 )); Params[4] = wxAny(wxSize(-1,-1)); Params[5] = wxAny((long)0); wxASSERT( info->Create(control, 6, Params )); control = wxDynamicCast( info->CreateObject(), wxControl ); Params[1] = wxAny(wxWindowID(baseID++)); Params[2] = wxAny(wxString("Another One")); Params[3] = wxAny(wxPoint( 10, 50 )); wxASSERT( info->Create(control, 6, Params )); info = wxClassInfo::FindClass("wxStaticText"); wxASSERT( info ); control = wxDynamicCast( info->CreateObject(), wxControl ); Params[0] = wxAny((wxWindow*)(panel)); Params[1] = wxAny(wxWindowID(baseID++)); Params[2] = wxAny(wxString("A Static Text!")); Params[3] = wxAny(wxPoint( 10, 70 )); Params[4] = wxAny(wxSize(-1,-1)); Params[5] = wxAny((long)0); wxASSERT( info->Create(control, 6, Params )); info = wxClassInfo::FindClass("wxStaticBox"); wxASSERT( info ); control = wxDynamicCast( info->CreateObject(), wxControl ); Params[0] = wxAny((wxWindow*)(panel)); Params[1] = wxAny(wxWindowID(baseID++)); Params[2] = wxAny(wxString("A Static Box")); Params[3] = wxAny(wxPoint( 10, 90 )); Params[4] = wxAny(wxSize(100,80)); Params[5] = wxAny((long)0); wxASSERT( info->Create(control, 6, Params )); info = wxClassInfo::FindClass("wxTextCtrl"); wxASSERT( info ); control = wxDynamicCast( info->CreateObject(), wxControl ); Params[0] = wxAny((wxWindow*)(panel)); Params[1] = wxAny(wxWindowID(baseID++)); Params[2] = wxAny(wxString("A Text Control")); Params[3] = wxAny(wxPoint( 10, 200 )); Params[4] = wxAny(wxSize(-1,-1)); Params[5] = wxAny((long)0); wxASSERT( info->Create(control, 6, Params )); // spins and gauges page info = wxClassInfo::FindClass("wxPanel"); wxASSERT( info ); panel = wxDynamicCast( info->CreateObject(), wxPanel ); Params[0] = wxAny((wxWindow*)(notebook)); Params[1] = wxAny(wxWindowID(baseID++)); Params[2] = wxAny(wxPoint(-1,-1)); Params[3] = wxAny(wxSize(-1,-1)); Params[4] = wxAny((long)0); Params[5] = wxAny(wxString("Hello")); wxASSERT( info->Create(panel, 6, Params )); notebook->AddPage( panel, "Spins and Sliders" ); wxENSURE_CLASS_IS_LINKED(wxSpinButton); info = wxClassInfo::FindClass("wxSpinButton"); wxASSERT( info ); control = wxDynamicCast( info->CreateObject(), wxControl ); Params[0] = wxAny((wxWindow*)(panel)); Params[1] = wxAny(wxWindowID(baseID++)); Params[2] = wxAny(wxPoint( 10, 10 )); Params[3] = wxAny(wxSize(-1,-1)); Params[4] = wxAny((long)wxSP_VERTICAL | wxSP_ARROW_KEYS); wxASSERT( info->Create(control, 5, Params )); wxENSURE_CLASS_IS_LINKED(wxSpinCtrl); info = wxClassInfo::FindClass("wxSpinCtrl"); wxASSERT( info ); control = wxDynamicCast( info->CreateObject(), wxControl ); Params[0] = wxAny((wxWindow*)(panel)); Params[1] = wxAny(wxWindowID(baseID++)); Params[2] = wxAny(wxString("20")); Params[3] = wxAny(wxPoint( 40, 10 )); Params[4] = wxAny(wxSize(40,-1)); Params[5] = wxAny((long) wxSP_ARROW_KEYS); wxASSERT( info->Create(control, 6, Params )); // MSVC likes to exclude from link wxGauge... wxENSURE_CLASS_IS_LINKED(wxGauge) wxENSURE_CLASS_IS_LINKED(wxCheckBox) wxENSURE_CLASS_IS_LINKED(wxSpinCtrl) info = wxClassInfo::FindClass("wxGauge"); wxASSERT( info ); control = wxDynamicCast( info->CreateObject(), wxControl ); Params[0] = wxAny((wxWindow*)(panel)); Params[1] = wxAny(wxWindowID(baseID++)); Params[2] = wxAny((int) 100); Params[3] = wxAny(wxPoint( 10, 50 )); Params[4] = wxAny(wxSize(-1,-1)); Params[5] = wxAny((long) wxGA_HORIZONTAL); wxASSERT( info->Create(control, 6, Params )); wx_dynamic_cast(wxGauge*, control)->SetValue(20); #endif return frameWrapper; } bool SaveFrameRTTI(const wxString &testFileName, wxDynamicObject *frame) { // setup the XML document wxXmlDocument xml; wxXmlNode *root = new wxXmlNode(wxXML_ELEMENT_NODE, "TestXTI", "This is the content"); xml.SetRoot(root); // setup the XTI writer and persister wxObjectXmlWriter writer(root); MyDesignerPersister persister(frame); // write the given wxObject into the XML document wxStringToAnyHashMap empty; writer.WriteObject( frame, frame->GetClassInfo(), &persister, wxString("myTestFrame"), empty ); return xml.Save(testFileName); } wxDynamicObject* LoadFrameRTTI(const wxString &fileName) { // load the XML document wxXmlDocument xml; if (!xml.Load(fileName)) return NULL; wxXmlNode *root = xml.GetRoot(); if (root->GetName() != "TestXTI") return NULL; // now depersist the wxFrame we saved into it using wxObjectRuntimeReaderCallback wxObjectRuntimeReaderCallback Callbacks; wxObjectXmlReader Reader( root ); int obj = Reader.ReadObject( wxString("myTestFrame"), &Callbacks ); return (wxDynamicObject*)Callbacks.GetObject( obj ); } bool GenerateFrameRTTICode(const wxString &inFileName, const wxString &outFileName) { // is loading the streamed out component from xml and writing code that // will create the same component wxFFileOutputStream fos( outFileName ); wxTextOutputStream tos( fos ); if (!fos.IsOk()) return false; wxXmlDocument xml; if (!xml.Load(inFileName)) return false; wxXmlNode *root = xml.GetRoot(); if (root->GetName() != "TestXTI") return false; // read the XML file using the wxObjectCodeReaderCallback wxString headerincludes; wxString sourcecode; wxObjectCodeReaderCallback Callbacks(headerincludes,sourcecode); wxObjectXmlReader Reader(root); // ReadObject will return the ID of the object read?? Reader.ReadObject( wxString("myTestFrame"), &Callbacks ); // header preamble tos << "#include \"wx/wxprec.h\" \n#ifndef WX_PRECOMP\n#include \"wx/wx.h\" \n#endif\n\n"; // add object includes tos.WriteString( headerincludes ); tos << "\n\nvoid test()\n{"; tos.WriteString( sourcecode ); tos << "}"; return true; } // ---------------------------------------------------------------------------- // MyFrame event handlers // ---------------------------------------------------------------------------- void MyFrame::OnPersist(wxCommandEvent& WXUNUSED(event)) { // first create a frame using XTI calls wxDynamicObject *frame = CreateFrameRTTI(); if (!frame) { wxLogError("Cannot create the XTI frame!"); return; } // show the frame we're going to save to the user wxFrame *trueFrame = wx_dynamic_cast(wxFrame *, frame->GetSuperClassInstance() ); trueFrame->Show(); // ask the user where to save it wxFileDialog dlg(this, "Where should the frame be saved?", wxEmptyString, "test.xml", "XML files (*.xml)|*.xml", wxFD_SAVE); if (dlg.ShowModal() == wxID_CANCEL) return; // then save it to a test XML file if (!SaveFrameRTTI(dlg.GetPath(), frame)) { wxLogError("Cannot save the XTI frame into '%s'", dlg.GetPath()); return; } // now simply delete it delete frame; } void MyFrame::OnDepersist(wxCommandEvent& WXUNUSED(event)) { // ask the user which file to load wxFileDialog dlg(this, "Which file contains the frame to depersist?", wxEmptyString, "test.xml", "XML files (*.xml)|*.xml", wxFD_OPEN); if (dlg.ShowModal() == wxID_CANCEL) return; wxObject *frame = LoadFrameRTTI(dlg.GetPath()); if (!frame) { wxLogError("Could not depersist the wxFrame from '%s'", dlg.GetPath()); return; } wxFrame *trueFrame = wx_dynamic_cast(wxFrame*, frame ); if ( !trueFrame ) { wxDynamicObject* dyno = wx_dynamic_cast(wxDynamicObject*, frame ); if ( dyno ) trueFrame = wx_dynamic_cast(wxFrame *, dyno->GetSuperClassInstance() ); } if ( trueFrame ) trueFrame->Show(); else wxLogError("Could not show the frame"); } void MyFrame::OnGenerateCode(wxCommandEvent& WXUNUSED(event)) { // ask the user which file to load wxFileDialog dlg(this, "Which file contains the frame to work on?", wxEmptyString, "test.xml", "XML files (*.xml)|*.xml", wxFD_OPEN); if (dlg.ShowModal() == wxID_CANCEL) return; // ask the user which file to load wxFileDialog dlg2(this, "Where should the C++ code be saved?", wxEmptyString, "test.cpp", "Source files (*.cpp)|*.cpp", wxFD_SAVE); if (dlg2.ShowModal() == wxID_CANCEL) return; // do generate code if (!GenerateFrameRTTICode(dlg.GetPath(), dlg2.GetPath())) { wxLogError("Could not generate the code for the frame!"); return; } // show the generated code { wxFileInputStream f(dlg2.GetPath()); wxStringOutputStream str; f.Read(str); wxDialog dlg3(this, wxID_ANY, "Generated code", wxDefaultPosition, wxDefaultSize, wxRESIZE_BORDER|wxDEFAULT_DIALOG_STYLE); wxPanel *panel = new wxPanel(&dlg3); wxSizer *sz = new wxBoxSizer(wxVERTICAL); sz->Add(new wxTextCtrl(panel, wxID_ANY, str.GetString(), wxDefaultPosition, wxDefaultSize, wxTE_MULTILINE|wxTE_READONLY|wxTE_DONTWRAP), 1, wxGROW|wxALL, 5); sz->Add(new wxButton(panel, wxID_OK), 0, wxALIGN_RIGHT|wxALL, 5); panel->SetSizerAndFit(sz); dlg3.ShowModal(); } } void MyFrame::OnDumpClasses(wxCommandEvent& WXUNUSED(event)) { ClassListDialog dlg(this); dlg.ShowModal(); } void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event)) { // true is to force the frame to close Close(true); } void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event)) { wxMessageBox(wxString::Format( "Welcome to %s!\n" "\n" "This sample demonstrates wxWidgets eXtended RTTI (XTI) system.", wxVERSION_STRING ), "About wxWidgets XTI sample", wxOK | wxICON_INFORMATION, this); }