]> git.saurik.com Git - wxWidgets.git/blobdiff - samples/help/demo.cpp
make it possible to use wxConsoleApp in GUI build
[wxWidgets.git] / samples / help / demo.cpp
index 2dc35fa01c2a3a29d2c57b28aab44fbabbfa039b..48b47d7f56e53359501996de73745eb2d5afd6cc 100644 (file)
@@ -32,6 +32,7 @@
 
 #   include "wx/image.h"
 #   include "wx/help.h"
+#   include "wx/cshelp.h"
 
 #if wxUSE_TOOLTIPS
 #   include "wx/tooltip.h"
 
 #define USE_HTML_HELP 1
 
-// Use old-style HTML help if 1
-#define USE_OLD_HTML_HELP 0
+// Define this to 0 to use the help controller as the help
+// provider, or to 1 to use the 'simple help provider'
+// (the one implemented with wxTipWindow).
+#define USE_SIMPLE_HELP_PROVIDER 0
 
 #if !wxUSE_HTML
 #undef USE_HTML_HELP
 #endif
 
 #if USE_HTML_HELP
-#include <wx/filesys.h>
-#include <wx/fs_zip.h>
-
-#if USE_OLD_HTML_HELP
-#include "wx/generic/helpwxht.h"
-#endif
+#include "wx/filesys.h"
+#include "wx/fs_zip.h"
 
 #include "wx/html/helpctrl.h"
 #endif
 #include "wx/msw/helpchm.h"
 #endif
 
+#if wxUSE_MS_HTML_HELP && wxUSE_WXHTML_HELP
+#include "wx/msw/helpbest.h"
+#endif
+
 // ----------------------------------------------------------------------------
 // ressources
 // ----------------------------------------------------------------------------
 // the application icon
-#if defined(__WXGTK__) || defined(__WXMOTIF__)
+#if defined(__WXGTK__) || defined(__WXX11__) || defined(__WXMOTIF__) || defined(__WXMAC__) || defined(__WXMGL__)
     #include "mondrian.xpm"
 #endif
 
@@ -89,6 +92,9 @@ public:
     // 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();
+
+    // do some clean up here
+    virtual int OnExit();
 };
 
 // Define a new frame type: this is going to be our main frame
@@ -101,24 +107,24 @@ public:
     wxHelpController& GetHelpController() { return m_help; }
 
 #if USE_HTML_HELP
-#if USE_OLD_HTML_HELP
-    wxHelpControllerHtml& GetHtmlHelpController() { return m_htmlHelp; }
-#endif
     wxHtmlHelpController& GetAdvancedHtmlHelpController() { return m_advancedHtmlHelp; }
 #endif
 #if wxUSE_MS_HTML_HELP
     wxCHMHelpController& GetMSHtmlHelpController() { return m_msHtmlHelp; }
 #endif
+#if wxUSE_MS_HTML_HELP && wxUSE_WXHTML_HELP
+    wxBestHelpController& GetBestHelpController() { return m_bestHelp; }
+#endif
 
     // event handlers (these functions should _not_ be virtual)
     void OnQuit(wxCommandEvent& event);
     void OnHelp(wxCommandEvent& event);
-    void OnHtmlHelp(wxCommandEvent& event);
     void OnAdvancedHtmlHelp(wxCommandEvent& event);
     void OnMSHtmlHelp(wxCommandEvent& event);
+    void OnBestHelp(wxCommandEvent& event);
 
-    void OnContextHelp(wxHelpEvent& event);
     void OnShowContextHelp(wxCommandEvent& event);
+    void OnShowDialogContextHelp(wxCommandEvent& event);
 
     void ShowHelp(int commandId, wxHelpControllerBase& helpController);
 
@@ -126,9 +132,6 @@ private:
    wxHelpController         m_help;
 
 #if USE_HTML_HELP
-#if USE_OLD_HTML_HELP
-   wxHelpControllerHtml     m_htmlHelp;
-#endif
    wxHtmlHelpController     m_advancedHtmlHelp;
 #endif
 
@@ -136,10 +139,25 @@ private:
     wxCHMHelpController     m_msHtmlHelp;
 #endif
 
+#if wxUSE_MS_HTML_HELP && wxUSE_WXHTML_HELP
+    wxBestHelpController    m_bestHelp;
+#endif
+
     // any class wishing to process wxWindows events must use this macro
    DECLARE_EVENT_TABLE()
 };
 
+// A custom modal dialog
+class MyModalDialog : public wxDialog
+{
+public:
+    MyModalDialog(wxWindow *parent);
+
+private:
+
+    DECLARE_EVENT_TABLE()
+};
+
 // ----------------------------------------------------------------------------
 // constants
 // ----------------------------------------------------------------------------
@@ -148,13 +166,14 @@ private:
 enum
 {
     // menu items
-    HelpDemo_Quit = 1,
+    HelpDemo_Quit = 100,
     HelpDemo_Help_Index,
     HelpDemo_Help_Classes,
     HelpDemo_Help_Functions,
     HelpDemo_Help_Help,
     HelpDemo_Help_Search,
     HelpDemo_Help_ContextHelp,
+    HelpDemo_Help_DialogContextHelp,
 
     HelpDemo_Html_Help_Index,
     HelpDemo_Html_Help_Classes,
@@ -174,6 +193,12 @@ enum
     HelpDemo_MS_Html_Help_Help,
     HelpDemo_MS_Html_Help_Search,
 
+    HelpDemo_Best_Help_Index,
+    HelpDemo_Best_Help_Classes,
+    HelpDemo_Best_Help_Functions,
+    HelpDemo_Best_Help_Help,
+    HelpDemo_Best_Help_Search,
+
     HelpDemo_Help_KDE,
     HelpDemo_Help_GNOME,
     HelpDemo_Help_Netscape,
@@ -196,14 +221,7 @@ BEGIN_EVENT_TABLE(MyFrame, wxFrame)
     EVT_MENU(HelpDemo_Help_Help, MyFrame::OnHelp)
     EVT_MENU(HelpDemo_Help_Search, MyFrame::OnHelp)
     EVT_MENU(HelpDemo_Help_ContextHelp, MyFrame::OnShowContextHelp)
-
-    EVT_HELP(-1, MyFrame::OnContextHelp)
-
-    EVT_MENU(HelpDemo_Html_Help_Index, MyFrame::OnHtmlHelp)
-    EVT_MENU(HelpDemo_Html_Help_Classes, MyFrame::OnHtmlHelp)
-    EVT_MENU(HelpDemo_Html_Help_Functions, MyFrame::OnHtmlHelp)
-    EVT_MENU(HelpDemo_Html_Help_Help, MyFrame::OnHtmlHelp)
-    EVT_MENU(HelpDemo_Html_Help_Search, MyFrame::OnHtmlHelp)
+    EVT_MENU(HelpDemo_Help_DialogContextHelp, MyFrame::OnShowDialogContextHelp)
 
     EVT_MENU(HelpDemo_Advanced_Html_Help_Index, MyFrame::OnAdvancedHtmlHelp)
     EVT_MENU(HelpDemo_Advanced_Html_Help_Classes, MyFrame::OnAdvancedHtmlHelp)
@@ -217,6 +235,8 @@ BEGIN_EVENT_TABLE(MyFrame, wxFrame)
     EVT_MENU(HelpDemo_MS_Html_Help_Help, MyFrame::OnMSHtmlHelp)
     EVT_MENU(HelpDemo_MS_Html_Help_Search, MyFrame::OnMSHtmlHelp)
 
+    EVT_MENU(HelpDemo_Best_Help_Index, MyFrame::OnBestHelp)
+
     EVT_MENU(HelpDemo_Help_KDE, MyFrame::OnHelp)
     EVT_MENU(HelpDemo_Help_GNOME, MyFrame::OnHelp)
     EVT_MENU(HelpDemo_Help_Netscape, MyFrame::OnHelp)
@@ -240,6 +260,15 @@ IMPLEMENT_APP(MyApp)
 // `Main program' equivalent: the program execution "starts" here
 bool MyApp::OnInit()
 {
+    // Create a simple help provider to make SetHelpText() do something.
+    // Note that this must be set before any SetHelpText() calls are made.
+#if USE_SIMPLE_HELP_PROVIDER
+    wxSimpleHelpProvider* provider = new wxSimpleHelpProvider;
+#else
+    wxHelpControllerHelpProvider* provider = new wxHelpControllerHelpProvider;
+#endif
+    wxHelpProvider::Set(provider);
+
 #if wxUSE_HTML
 #if wxUSE_GIF
     // Required for images in the online documentation
@@ -254,46 +283,60 @@ bool MyApp::OnInit()
 #endif
 
     // Create the main application window
-    MyFrame *frame = new MyFrame("HelpDemo wxWindows App",
+    MyFrame *frame = new MyFrame(_T("HelpDemo wxWindows App"),
                                  wxPoint(50, 50), wxSize(450, 340));
 
+#if !USE_SIMPLE_HELP_PROVIDER
+#if wxUSE_MS_HTML_HELP
+    provider->SetHelpController(& frame->GetMSHtmlHelpController());
+#else
+    provider->SetHelpController(& frame->GetHelpController());
+#endif
+#endif
+
     frame->Show(TRUE);
     SetTopWindow(frame);
 
     // initialise the help system: this means that we'll use doc.hlp file under
     // Windows and that the HTML docs are in the subdirectory doc for platforms
     // using HTML help
-    if ( !frame->GetHelpController().Initialize("doc") )
+    if ( !frame->GetHelpController().Initialize(_T("doc")) )
     {
-        wxLogError("Cannot initialize the help system, aborting.");
+        wxLogError(wxT("Cannot initialize the help system, aborting."));
 
         return FALSE;
     }
 
-#if USE_HTML_HELP
-    // initialise the standard HTML help system: this means that the HTML docs are in the
-    // subdirectory doc for platforms using HTML help
-#if USE_OLD_HTML_HELP
-    if ( !frame->GetHtmlHelpController().Initialize("doc") )
+#if wxUSE_MS_HTML_HELP
+    if( !frame->GetMSHtmlHelpController().Initialize(_T("doc")) )
     {
-        wxLogError("Cannot initialize the HTML help system, aborting.");
+        wxLogError(wxT("Cannot initialize the MS HTML Help system."));
+    }
+#endif
 
-        return FALSE;
+#if wxUSE_MS_HTML_HELP && wxUSE_WXHTML_HELP
+    // you need to call Initialize in order to use wxBestHelpController
+    if( !frame->GetBestHelpController().Initialize(_T("doc")) )
+    {
+        wxLogError(wxT("Cannot initialize the best help system, aborting."));
     }
 #endif
 
+#if USE_HTML_HELP
     // initialise the advanced HTML help system: this means that the HTML docs are in .htb
     // (zipped) form
-    if ( !frame->GetAdvancedHtmlHelpController().Initialize("doc") )
+    if ( !frame->GetAdvancedHtmlHelpController().Initialize(_T("doc")) )
     {
-        wxLogError("Cannot initialize the advanced HTML help system, aborting.");
+        wxLogError(wxT("Cannot initialize the advanced HTML help system, aborting."));
 
         return FALSE;
     }
 #endif
 
-#if wxUSE_MS_HTML_HELP
-    if ( !frame->GetMSHtmlHelpController().Initialize("doc") )
+#if 0
+    // defined(__WXMSW__) && wxUSE_MS_HTML_HELP
+    wxString path(wxGetCwd());
+    if ( !frame->GetMSHtmlHelpController().Initialize(path + _T("\\doc.chm")) )
     {
         wxLogError("Cannot initialize the MS HTML help system, aborting.");
 
@@ -304,13 +347,21 @@ bool MyApp::OnInit()
     return TRUE;
 }
 
+int MyApp::OnExit()
+{
+    // clean up
+    delete wxHelpProvider::Set(NULL);
+
+    return 0;
+}
+
 // ----------------------------------------------------------------------------
 // main frame
 // ----------------------------------------------------------------------------
 
 // frame constructor
 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
-       : wxFrame((wxFrame *)NULL, -1, title, pos, size)
+       : wxFrame((wxFrame *)NULL, 300, title, pos, size)
 {
     // set the frame icon
     SetIcon(wxICON(mondrian));
@@ -318,68 +369,69 @@ MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
     // create a menu bar
     wxMenu *menuFile = new wxMenu;
 
-    menuFile->Append(HelpDemo_Help_Index, "&Help Index...");
-    menuFile->Append(HelpDemo_Help_Classes, "&Help on Classes...");
-    menuFile->Append(HelpDemo_Help_Functions, "&Help on Functions...");
-    menuFile->Append(HelpDemo_Help_ContextHelp, "&Context Help...");
-    menuFile->Append(HelpDemo_Help_Help, "&About Help Demo...");
-    menuFile->Append(HelpDemo_Help_Search, "&Search help...");
+    menuFile->Append(HelpDemo_Help_Index, _T("&Help Index..."));
+    menuFile->Append(HelpDemo_Help_Classes, _T("&Help on Classes..."));
+    menuFile->Append(HelpDemo_Help_Functions, _T("&Help on Functions..."));
+    menuFile->Append(HelpDemo_Help_ContextHelp, _T("&Context Help..."));
+    menuFile->Append(HelpDemo_Help_DialogContextHelp, _T("&Dialog Context Help...\tCtrl-H"));
+    menuFile->Append(HelpDemo_Help_Help, _T("&About Help Demo..."));
+    menuFile->Append(HelpDemo_Help_Search, _T("&Search help..."));
 #if USE_HTML_HELP
-#if USE_OLD_HTML_HELP
     menuFile->AppendSeparator();
-    menuFile->Append(HelpDemo_Html_Help_Index, "HTML &Help Index...");
-    menuFile->Append(HelpDemo_Html_Help_Classes, "HTML &Help on Classes...");
-    menuFile->Append(HelpDemo_Html_Help_Functions, "HTML &Help on Functions...");
-    menuFile->Append(HelpDemo_Html_Help_Help, "HTML &About Help Demo...");
-    menuFile->Append(HelpDemo_Html_Help_Search, "HTML &Search help...");
+    menuFile->Append(HelpDemo_Advanced_Html_Help_Index, _T("Advanced HTML &Help Index..."));
+    menuFile->Append(HelpDemo_Advanced_Html_Help_Classes, _T("Advanced HTML &Help on Classes..."));
+    menuFile->Append(HelpDemo_Advanced_Html_Help_Functions, _T("Advanced HTML &Help on Functions..."));
+    menuFile->Append(HelpDemo_Advanced_Html_Help_Help, _T("Advanced HTML &About Help Demo..."));
+    menuFile->Append(HelpDemo_Advanced_Html_Help_Search, _T("Advanced HTML &Search help..."));
 #endif
+
+#if wxUSE_MS_HTML_HELP
     menuFile->AppendSeparator();
-    menuFile->Append(HelpDemo_Advanced_Html_Help_Index, "Advanced HTML &Help Index...");
-    menuFile->Append(HelpDemo_Advanced_Html_Help_Classes, "Advanced HTML &Help on Classes...");
-    menuFile->Append(HelpDemo_Advanced_Html_Help_Functions, "Advanced HTML &Help on Functions...");
-    menuFile->Append(HelpDemo_Advanced_Html_Help_Help, "Advanced HTML &About Help Demo...");
-    menuFile->Append(HelpDemo_Advanced_Html_Help_Search, "Advanced HTML &Search help...");
+    menuFile->Append(HelpDemo_MS_Html_Help_Index, _T("MS HTML &Help Index..."));
+    menuFile->Append(HelpDemo_MS_Html_Help_Classes, _T("MS HTML &Help on Classes..."));
+    menuFile->Append(HelpDemo_MS_Html_Help_Functions, _T("MS HTML &Help on Functions..."));
+    menuFile->Append(HelpDemo_MS_Html_Help_Help, _T("MS HTML &About Help Demo..."));
+    menuFile->Append(HelpDemo_MS_Html_Help_Search, _T("MS HTML &Search help..."));
 #endif
 
-#if wxUSE_MS_HTML_HELP
+#if wxUSE_MS_HTML_HELP && wxUSE_WXHTML_HELP
     menuFile->AppendSeparator();
-    menuFile->Append(HelpDemo_MS_Html_Help_Index, "MS HTML &Help Index...");
-    menuFile->Append(HelpDemo_MS_Html_Help_Classes, "MS HTML &Help on Classes...");
-    menuFile->Append(HelpDemo_MS_Html_Help_Functions, "MS HTML &Help on Functions...");
-    menuFile->Append(HelpDemo_MS_Html_Help_Help, "MS HTML &About Help Demo...");
-    menuFile->Append(HelpDemo_MS_Html_Help_Search, "MS HTML &Search help...");
+    menuFile->Append(HelpDemo_Best_Help_Index, _T("Best &Help Index..."));
 #endif
 
 #ifndef __WXMSW__
 #if !wxUSE_HTML
     menuFile->AppendSeparator();
-    menuFile->Append(HelpDemo_Help_KDE, "Use &KDE");
-    menuFile->Append(HelpDemo_Help_GNOME, "Use &GNOME");
-    menuFile->Append(HelpDemo_Help_Netscape, "Use &Netscape");
+    menuFile->Append(HelpDemo_Help_KDE, _T("Use &KDE"));
+    menuFile->Append(HelpDemo_Help_GNOME, _T("Use &GNOME"));
+    menuFile->Append(HelpDemo_Help_Netscape, _T("Use &Netscape"));
 #endif
 #endif
     menuFile->AppendSeparator();
-    menuFile->Append(HelpDemo_Quit, "E&xit");
+    menuFile->Append(HelpDemo_Quit, _T("E&xit"));
 
     // now append the freshly created menu to the menu bar...
     wxMenuBar *menuBar = new wxMenuBar;
-    menuBar->Append(menuFile, "&File");
+    menuBar->Append(menuFile, _T("&File"));
 
     // ... and attach this menu bar to the frame
     SetMenuBar(menuBar);
 
     // create a status bar just for fun (by default with 1 pane only)
     CreateStatusBar();
-    SetStatusText("Welcome to wxWindows!");
+    SetStatusText(_T("Welcome to wxWindows!"));
 
     // now create some controls
 
     // a panel first - if there were several controls, it would allow us to
     // navigate between them from the keyboard
-    wxPanel *panel = new wxPanel(this, -1, wxPoint(0, 0), wxSize(400, 200));
+    wxPanel *panel = new wxPanel(this, 301, wxPoint(0, 0), wxSize(400, 200));
+    panel->SetHelpText(_("This panel just holds a static text control."));
+    //panel->SetHelpText(wxContextId(300));
 
     // and a static control whose parent is the panel
-    (void)new wxStaticText(panel, -1, "Hello, world!", wxPoint(10, 10));
+    wxStaticText* staticText = new wxStaticText(panel, 302, _T("Hello, world!"), wxPoint(10, 10));
+    staticText->SetHelpText(_("This static text control isn't doing a lot right now."));
 }
 
 
@@ -403,21 +455,10 @@ void MyFrame::OnShowContextHelp(wxCommandEvent& event)
     wxContextHelp contextHelp(this);
 }
 
-void MyFrame::OnContextHelp(wxHelpEvent& event)
+void MyFrame::OnShowDialogContextHelp(wxCommandEvent& event)
 {
-    // In a real app, if we didn't recognise this ID, we should call event.Skip()
-    wxString msg;
-    msg.Printf(wxT("We should now display help for window %d"), event.GetId());
-    wxMessageBox(msg);
-    //wxToolTip::Enable(TRUE);
-    //SetToolTip(msg);
-}
-
-void MyFrame::OnHtmlHelp(wxCommandEvent& event)
-{
-#if USE_HTML_HELP && USE_OLD_HTML_HELP
-    ShowHelp(event.GetId(), m_htmlHelp);
-#endif
+    MyModalDialog dialog(this);
+    dialog.ShowModal();
 }
 
 void MyFrame::OnAdvancedHtmlHelp(wxCommandEvent& event)
@@ -434,6 +475,13 @@ void MyFrame::OnMSHtmlHelp(wxCommandEvent& event)
 #endif
 }
 
+void MyFrame::OnBestHelp(wxCommandEvent& event)
+{
+#if wxUSE_MS_HTML_HELP && wxUSE_WXHTML_HELP
+    ShowHelp(event.GetId(), m_bestHelp);
+#endif
+}
+
 /*
  Notes: ShowHelp uses section ids for displaying particular topics,
  but you might want to use a unique keyword to display a topic, instead.
@@ -505,64 +553,118 @@ void MyFrame::ShowHelp(int commandId, wxHelpControllerBase& helpController)
 {
    switch(commandId)
    {
-   case HelpDemo_Help_Classes:
-   case HelpDemo_Html_Help_Classes:
-   case HelpDemo_Advanced_Html_Help_Classes:
-   case HelpDemo_MS_Html_Help_Classes:
-      helpController.DisplaySection(2);
-      //helpController.DisplaySection("Classes"); // An alternative form for most controllers
-
-      break;
-   case HelpDemo_Help_Functions:
-   case HelpDemo_Html_Help_Functions:
-   case HelpDemo_Advanced_Html_Help_Functions:
-   case HelpDemo_MS_Html_Help_Functions:
-      helpController.DisplaySection(1);
-      //helpController.DisplaySection("Functions"); // An alternative form for most controllers
-      break;
-   case HelpDemo_Help_Help:
-   case HelpDemo_Html_Help_Help:
-   case HelpDemo_Advanced_Html_Help_Help:
-   case HelpDemo_MS_Html_Help_Help:
-      helpController.DisplaySection(3);
-      //helpController.DisplaySection("About"); // An alternative form for most controllers
-      break;
-
-   case HelpDemo_Help_Search:
-   case HelpDemo_Html_Help_Search:
-   case HelpDemo_Advanced_Html_Help_Search:
-   case HelpDemo_MS_Html_Help_Search:
-   {
-      wxString key = wxGetTextFromUser("Search for?",
-                                       "Search help for keyword",
-                                       "",
-                                       this);
-      if(! key.IsEmpty())
-         helpController.KeywordSearch(key);
-   }
-   break;
-
-   case HelpDemo_Help_Index:
-   case HelpDemo_Html_Help_Index:
-   case HelpDemo_Advanced_Html_Help_Index:
-   case HelpDemo_MS_Html_Help_Index:
-      helpController.DisplayContents();
-      break;
-
-   // These three calls are only used by wxExtHelpController
-
-   case HelpDemo_Help_KDE:
-      helpController.SetViewer("kdehelp");
-      break;
-   case HelpDemo_Help_GNOME:
-      helpController.SetViewer("gnome-help-browser");
-      break;
-   case HelpDemo_Help_Netscape:
-      helpController.SetViewer("netscape", wxHELP_NETSCAPE);
-      break;
-
-   default:
-      break;
+       case HelpDemo_Help_Classes:
+       case HelpDemo_Html_Help_Classes:
+       case HelpDemo_Advanced_Html_Help_Classes:
+       case HelpDemo_MS_Html_Help_Classes:
+       case HelpDemo_Best_Help_Classes:
+          helpController.DisplaySection(2);
+          //helpController.DisplaySection("Classes"); // An alternative form for most controllers
+          break;
+
+       case HelpDemo_Help_Functions:
+       case HelpDemo_Html_Help_Functions:
+       case HelpDemo_Advanced_Html_Help_Functions:
+       case HelpDemo_MS_Html_Help_Functions:
+          helpController.DisplaySection(1);
+          //helpController.DisplaySection("Functions"); // An alternative form for most controllers
+          break;
+
+       case HelpDemo_Help_Help:
+       case HelpDemo_Html_Help_Help:
+       case HelpDemo_Advanced_Html_Help_Help:
+       case HelpDemo_MS_Html_Help_Help:
+       case HelpDemo_Best_Help_Help:
+          helpController.DisplaySection(3);
+          //helpController.DisplaySection("About"); // An alternative form for most controllers
+          break;
+
+       case HelpDemo_Help_Search:
+       case HelpDemo_Html_Help_Search:
+       case HelpDemo_Advanced_Html_Help_Search:
+       case HelpDemo_MS_Html_Help_Search:
+       case HelpDemo_Best_Help_Search:
+       {
+          wxString key = wxGetTextFromUser(_T("Search for?"),
+                                           _T("Search help for keyword"),
+                                           _T(""),
+                                           this);
+          if(! key.IsEmpty())
+             helpController.KeywordSearch(key);
+       }
+       break;
+
+       case HelpDemo_Help_Index:
+       case HelpDemo_Html_Help_Index:
+       case HelpDemo_Advanced_Html_Help_Index:
+       case HelpDemo_MS_Html_Help_Index:
+       case HelpDemo_Best_Help_Index:
+          helpController.DisplayContents();
+          break;
+
+       // These three calls are only used by wxExtHelpController
+
+       case HelpDemo_Help_KDE:
+          helpController.SetViewer(_T("kdehelp"));
+          break;
+       case HelpDemo_Help_GNOME:
+          helpController.SetViewer(_T("gnome-help-browser"));
+          break;
+       case HelpDemo_Help_Netscape:
+          helpController.SetViewer(_T("netscape"), wxHELP_NETSCAPE);
+          break;
    }
 }
 
+// ----------------------------------------------------------------------------
+// MyModalDialog
+// Demonstrates context-sensitive help
+// ----------------------------------------------------------------------------
+
+BEGIN_EVENT_TABLE(MyModalDialog, wxDialog)
+END_EVENT_TABLE()
+
+MyModalDialog::MyModalDialog(wxWindow *parent)
+             : wxDialog()
+{
+    // Add the context-sensitive help button on the caption for MSW
+#ifdef __WXMSW__
+    SetExtraStyle(wxDIALOG_EX_CONTEXTHELP);
+#endif
+
+    wxDialog::Create(parent, -1, wxString(_T("Modal dialog")));
+
+    wxBoxSizer *sizerTop = new wxBoxSizer(wxVERTICAL);
+    wxBoxSizer *sizerRow = new wxBoxSizer(wxHORIZONTAL);
+
+    wxButton* btnOK = new wxButton(this, wxID_OK, _T("&OK"));
+    btnOK->SetHelpText(_("The OK button confirms the dialog choices."));
+
+    wxButton* btnCancel = new wxButton(this, wxID_CANCEL, _T("&Cancel"));
+    btnCancel->SetHelpText(_("The Cancel button cancels the dialog."));
+
+    sizerRow->Add(btnOK, 0, wxALIGN_CENTER | wxALL, 5);
+    sizerRow->Add(btnCancel, 0, wxALIGN_CENTER | wxALL, 5);
+
+    // Add explicit context-sensitive help button for non-MSW
+#ifndef __WXMSW__
+    sizerRow->Add(new wxContextHelpButton(this), 0, wxALIGN_CENTER | wxALL, 5);
+#endif
+
+    wxTextCtrl *text = new wxTextCtrl(this, -1, wxT("A demo text control"),
+                                      wxDefaultPosition, wxSize(300, 100),
+                                      wxTE_MULTILINE);
+    text->SetHelpText(_("Type text here if you have got nothing more interesting to do"));
+    sizerTop->Add(text, 0, wxEXPAND|wxALIGN_CENTER_VERTICAL|wxALL, 5 );
+    sizerTop->Add(sizerRow, 0, wxALIGN_RIGHT|wxALIGN_CENTER_VERTICAL|wxALL, 5 );
+
+    SetAutoLayout(TRUE);
+    SetSizer(sizerTop);
+
+    sizerTop->SetSizeHints(this);
+    sizerTop->Fit(this);
+
+    btnOK->SetFocus();
+    btnOK->SetDefault();
+}
+