Ensure that validators work even in presence of pushed event handlers.

[wxWidgets.git] / src / gtk / utilsgtk.cpp

diff --git a/src/gtk/utilsgtk.cpp b/src/gtk/utilsgtk.cpp
index 3ff9803dd4f77c168c9507dc68c0ce327e83a4b6..e337be979235751aa3babba287ad8da657318ec6 100644 (file)
--- a/src/gtk/utilsgtk.cpp
+++ b/src/gtk/utilsgtk.cpp
@@ -1,406 +1,524 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        utils.cpp
+// Name:        src/gtk/utilsgtk.cpp

 // Purpose:
 // Author:      Robert Roebling
 // Purpose:
 // Author:      Robert Roebling

-// Created:     01/02/97
-// Id:
-// Copyright:   (c) 1998 Robert Roebling, Julian Smart and Markus Holzem
-// Licence:    wxWindows licence
+// Id:          $Id$
+// Copyright:   (c) 1998 Robert Roebling
+// Licence:     wxWindows licence

 /////////////////////////////////////////////////////////////////////////////
 
 /////////////////////////////////////////////////////////////////////////////
 

-
-//#ifdef __GNUG__
-//#pragma implementation "utils.h"
-//#endif
+// For compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"

 
 #include "wx/utils.h"
 
 #include "wx/utils.h"

-#include "wx/string.h"
+
+#ifndef WX_PRECOMP
+    #include "wx/string.h"
+    #include "wx/intl.h"
+    #include "wx/log.h"
+#endif
+
+#include "wx/apptrait.h"
+#include "wx/process.h"
+#include "wx/sysopt.h"
+#include "wx/unix/execute.h"
+
+#include "wx/gtk/private/timer.h"
+#include "wx/evtloop.h"
+
+#if wxDEBUG_LEVEL
+    #include "wx/gtk/assertdlg_gtk.h"
+    #if wxUSE_STACKWALKER
+        #include "wx/stackwalk.h"
+    #endif // wxUSE_STACKWALKER
+#endif // wxDEBUG_LEVEL

 
 #include <stdarg.h>
 
 #include <stdarg.h>

-#include <dirent.h>

 #include <string.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <string.h>
 #include <sys/stat.h>
 #include <sys/types.h>

+#include <sys/wait.h>   // for WNOHANG

 #include <unistd.h>
 #include <unistd.h>

-#include <sys/wait.h>
-#include <pwd.h>
-#include <errno.h>
-#include <netdb.h>

 
 

-#ifdef __SVR4__
-#include <sys/systeminfo.h>
+#include "glib.h"
+#include "gdk/gdk.h"
+#include "gtk/gtk.h"
+#include "gdk/gdkx.h"
+
+#if wxUSE_DETECT_SM
+    #include "X11/Xlib.h"
+    #include "X11/SM/SMlib.h"

 #endif
 
 #endif
 

-//------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+// data
+//-----------------------------------------------------------------------------
+
+extern GtkWidget *wxGetRootWindow();
+
+//----------------------------------------------------------------------------

 // misc.
 // misc.

-//------------------------------------------------------------------------
+//----------------------------------------------------------------------------
+#ifndef __EMX__
+// on OS/2, we use the wxBell from wxBase library

 
 

-void wxBell(void)
+void wxBell()

 {
 {

-  gdk_beep();
-};
+    gdk_beep();
+}
+#endif

 
 

-//------------------------------------------------------------------------
-// user and home routines
-//------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
+// display characterstics
+// ----------------------------------------------------------------------------

 
 

-char* wxGetHomeDir( char *dest )
+void *wxGetDisplay()

 {
 {

-  wxString tmp = wxGetUserHome( wxString() );
-  if (tmp.IsNull())
-    strcpy( wxBuffer, "/" );
-  else
-    strcpy( wxBuffer, tmp );
-  if (dest) strcpy( dest, WXSTRINGCAST tmp );
-  return wxBuffer;
-};
+    return GDK_DISPLAY();
+}

 
 

-char *wxGetUserHome( const wxString &user )
+void wxDisplaySize( int *width, int *height )

 {
 {

-  struct passwd *who = NULL;
-
-  if (user.IsNull() || (user== "")) 
-  {
-       register char *ptr;
-
-       if ((ptr = getenv("HOME")) != NULL) 
-           return ptr;
-       if ((ptr = getenv("USER")) != NULL
-       || (ptr = getenv("LOGNAME")) != NULL) {
-           who = getpwnam(ptr);
-       }
-       // We now make sure the the user exists!
-       if (who == NULL)
-           who = getpwuid(getuid());
-  } 
-  else
-    who = getpwnam (user);
-    
-  return who ? who->pw_dir : (char*)NULL;
-};
+    if (width) *width = gdk_screen_width();
+    if (height) *height = gdk_screen_height();
+}

 
 

-//------------------------------------------------------------------------
-// id routines
-//------------------------------------------------------------------------
+void wxDisplaySizeMM( int *width, int *height )
+{
+    if (width) *width = gdk_screen_width_mm();
+    if (height) *height = gdk_screen_height_mm();
+}

 
 

-bool wxGetHostName(char *buf, int sz)
+void wxGetMousePosition( int* x, int* y )

 {
 {

-    *buf = '\0';
-#if defined(__SVR4__) && !defined(__sgi)
-    return (sysinfo(SI_HOSTNAME, buf, sz) != -1);
-#else /* BSD Sockets */
-    char name[255];
-    struct hostent *h;
-    // Get hostname
-    if (gethostname(name, sizeof(name)/sizeof(char)-1) == -1)
-       return FALSE;
-    // Get official full name of host
-    strncpy(buf, (h=gethostbyname(name))!=NULL ? h->h_name : name, sz-1);
-    return TRUE;
-#endif
+    gdk_window_get_pointer( NULL, x, y, NULL );
+}
+
+bool wxColourDisplay()
+{
+    return true;
+}
+
+int wxDisplayDepth()
+{
+    return gdk_drawable_get_visual( wxGetRootWindow()->window )->depth;
+}
+
+wxWindow* wxFindWindowAtPoint(const wxPoint& pt)
+{
+    return wxGenericFindWindowAtPoint(pt);

 }
 
 }
 

-bool wxGetUserId(char *buf, int sz)
+#if !wxUSE_UNICODE
+
+WXDLLIMPEXP_CORE wxCharBuffer
+wxConvertToGTK(const wxString& s, wxFontEncoding enc)

 {
 {

-    struct passwd *who;
+    wxWCharBuffer wbuf;
+    if ( enc == wxFONTENCODING_SYSTEM || enc == wxFONTENCODING_DEFAULT )
+    {
+        wbuf = wxConvUI->cMB2WC(s.c_str());
+    }
+    else // another encoding, use generic conversion class
+    {
+        wbuf = wxCSConv(enc).cMB2WC(s.c_str());
+    }

 
 

-    *buf = '\0';
-    if ((who = getpwuid(getuid ())) != NULL) {
-       strncpy (buf, who->pw_name, sz-1);
-       return TRUE;
+    if ( !wbuf && !s.empty() )
+    {
+        // conversion failed, but we still want to show something to the user
+        // even if it's going to be wrong it is better than nothing
+        //
+        // we choose ISO8859-1 here arbitrarily, it's just the most common
+        // encoding probably and, also importantly here, conversion from it
+        // never fails as it's done internally by wxCSConv
+        wbuf = wxCSConv(wxFONTENCODING_ISO8859_1).cMB2WC(s.c_str());

     }
     }

-    return FALSE;
+
+    return wxConvUTF8.cWC2MB(wbuf);

 }
 
 }
 

-bool wxGetUserName(char *buf, int sz)
+WXDLLIMPEXP_CORE wxCharBuffer
+wxConvertFromGTK(const wxString& s, wxFontEncoding enc)

 {
 {

-    struct passwd *who;
+    // this conversion should never fail as GTK+ always uses UTF-8 internally
+    // so there are no complications here
+    const wxWCharBuffer wbuf(wxConvUTF8.cMB2WC(s.c_str()));
+    if ( enc == wxFONTENCODING_SYSTEM )
+        return wxConvUI->cWC2MB(wbuf);
+
+    return wxCSConv(enc).cWC2MB(wbuf);
+}

 
 

-    *buf = '\0';
-    if ((who = getpwuid (getuid ())) != NULL) {
-       strncpy (buf, who->pw_gecos, sz - 1);
-       return TRUE;
+#endif // !wxUSE_UNICODE
+
+// Returns NULL if version is certainly greater or equal than major.minor.micro
+// Returns string describing the error if version is lower than
+// major.minor.micro OR it cannot be determined and one should not rely on the
+// availability of pango version major.minor.micro, nor the non-availability
+const gchar *wx_pango_version_check (int major, int minor, int micro)
+{
+    // NOTE: you don't need to use this macro to check for Pango features
+    //       added in pango-1.4 or earlier since GTK 2.4 (our minimum requirement
+    //       for GTK lib) required pango 1.4...
+
+#ifdef PANGO_VERSION_MAJOR
+    if (!gtk_check_version (2,11,0))
+    {
+        // GTK+ 2.11 requires Pango >= 1.15.3 and pango_version_check
+        // was added in Pango 1.15.2 thus we know for sure the pango lib we're
+        // using has the pango_version_check function:
+        return pango_version_check (major, minor, micro);

     }
     }

-    return FALSE;
+
+    return "can't check";
+#else // !PANGO_VERSION_MAJOR
+    wxUnusedVar(major);
+    wxUnusedVar(minor);
+    wxUnusedVar(micro);
+
+    return "too old headers";
+#endif

 }
 
 }
 

-//------------------------------------------------------------------------
-// error and debug output routines
-//------------------------------------------------------------------------

 
 

-void wxDebugMsg( const char *format, ... )
+// ----------------------------------------------------------------------------
+// subprocess routines
+// ----------------------------------------------------------------------------
+
+extern "C" {
+static
+void GTK_EndProcessDetector(gpointer data, gint source,
+                            GdkInputCondition WXUNUSED(condition))

 {
 {

-  va_list ap;
-  va_start( ap, format );
-  vfprintf( stderr, format, ap ); 
-  fflush( stderr );
-  va_end(ap);
-};
+    wxEndProcessData * const
+        proc_data = static_cast<wxEndProcessData *>(data);
+
+    // child exited, end waiting
+    close(source);

 
 

-void wxError( const wxString &msg, const wxString &title )
+    // don't call us again!
+    gdk_input_remove(proc_data->tag);
+
+    wxHandleProcessTermination(proc_data);
+}
+}
+
+int wxGUIAppTraits::AddProcessCallback(wxEndProcessData *proc_data, int fd)

 {
 {

-  fprintf( stderr, "Error " );
-  if (!title.IsNull()) fprintf( stderr, "%s ", WXSTRINGCAST(title) );
-  if (!msg.IsNull()) fprintf( stderr, ": %s", WXSTRINGCAST(msg) );
-  fprintf( stderr, ".\n" );
-};
+    int tag = gdk_input_add(fd,
+                            GDK_INPUT_READ,
+                            GTK_EndProcessDetector,
+                            (gpointer)proc_data);

 
 

-void wxFatalError( const wxString &msg, const wxString &title )
+    return tag;
+}
+
+
+
+// ----------------------------------------------------------------------------
+// wxPlatformInfo-related
+// ----------------------------------------------------------------------------
+
+wxPortId wxGUIAppTraits::GetToolkitVersion(int *verMaj, int *verMin) const

 {
 {

-  fprintf( stderr, "Error " );
-  if (!title.IsNull()) fprintf( stderr, "%s ", WXSTRINGCAST(title) );
-  if (!msg.IsNull()) fprintf( stderr, ": %s", WXSTRINGCAST(msg) );
-  fprintf( stderr, ".\n" );
-  exit(1);
-};
+    if ( verMaj )
+        *verMaj = gtk_major_version;
+    if ( verMin )
+        *verMin = gtk_minor_version;

 
 

-//------------------------------------------------------------------------
-// directory routines
-//------------------------------------------------------------------------
+    return wxPORT_GTK;
+}
+
+#if wxUSE_TIMER

 
 

-bool wxDirExists( const wxString& dir )
+wxTimerImpl *wxGUIAppTraits::CreateTimerImpl(wxTimer *timer)

 {
 {

-  char buf[500];
-  strcpy( buf, WXSTRINGCAST(dir) );
-  struct stat sbuf;
-  return ((stat(buf, &sbuf) != -1) && S_ISDIR(sbuf.st_mode) ? TRUE : FALSE);
-};
+    return new wxGTKTimerImpl(timer);
+}

 
 

-//------------------------------------------------------------------------
-// wild character routines
-//------------------------------------------------------------------------
+#endif // wxUSE_TIMER

 
 

-bool wxIsWild( const wxString& pattern )
+#if wxUSE_DETECT_SM
+static wxString GetSM()

 {
 {

-  wxString tmp = pattern;
-  char *pat = WXSTRINGCAST(tmp);
-    while (*pat) {
-       switch (*pat++) {
-       case '?': case '*': case '[': case '{':
-           return TRUE;
-       case '\\':
-           if (!*pat++)
-               return FALSE;
-       }
+    class Dpy
+    {
+    public:
+        Dpy() { m_dpy = XOpenDisplay(NULL); }
+        ~Dpy() { if ( m_dpy ) XCloseDisplay(m_dpy); }
+
+        operator Display *() const { return m_dpy; }
+    private:
+        Display *m_dpy;
+    } dpy;
+
+    if ( !dpy )
+        return wxEmptyString;
+
+    char smerr[256];
+    char *client_id;
+    SmcConn smc_conn = SmcOpenConnection(NULL, NULL,
+                                         999, 999,
+                                         0 /* mask */, NULL /* callbacks */,
+                                         NULL, &client_id,
+                                         WXSIZEOF(smerr), smerr);
+
+    if ( !smc_conn )
+    {
+        wxLogDebug("Failed to connect to session manager: %s", smerr);
+        return wxEmptyString;

     }
     }

-    return FALSE;
-};
+
+    char *vendor = SmcVendor(smc_conn);
+    wxString ret = wxString::FromAscii( vendor );
+    free(vendor);
+
+    SmcCloseConnection(smc_conn, 0, NULL);
+    free(client_id);
+
+    return ret;
+}
+#endif // wxUSE_DETECT_SM
+
+
+//-----------------------------------------------------------------------------
+// wxGUIAppTraits
+//-----------------------------------------------------------------------------
+
+wxEventLoopBase *wxGUIAppTraits::CreateEventLoop()
+{
+    return new wxEventLoop();
+}

 
 
 
 

-bool wxMatchWild( const wxString& pat, const wxString& text, bool dot_special )
+#if wxUSE_INTL
+void wxGUIAppTraits::SetLocale()

 {
 {

-  wxString tmp1 = pat;
-  char *pattern = WXSTRINGCAST(tmp1);
-  wxString tmp2 = text;
-  char *str = WXSTRINGCAST(tmp2);
-    char c;
-    char *cp;
-    bool done = FALSE, ret_code, ok;
-    // Below is for vi fans
-    const char OB = '{', CB = '}';
-
-    // dot_special means '.' only matches '.'
-    if (dot_special && *str == '.' && *pattern != *str)
-       return FALSE;
-
-    while ((*pattern != '\0') && (!done)
-    && (((*str=='\0')&&((*pattern==OB)||(*pattern=='*')))||(*str!='\0'))) {
-       switch (*pattern) {
-       case '\\':
-           pattern++;
-           if (*pattern != '\0')
-               pattern++;
-           break;
-       case '*':
-           pattern++;
-           ret_code = FALSE;
-           while ((*str!='\0')
-           && (!(ret_code=wxMatchWild(pattern, str++, FALSE))))
-               /*loop*/;
-           if (ret_code) {
-               while (*str != '\0')
-                   str++;
-               while (*pattern != '\0')
-                   pattern++;
-           }
-           break;
-       case '[':
-           pattern++;
-         repeat:
-           if ((*pattern == '\0') || (*pattern == ']')) {
-               done = TRUE;
-               break;
-           }
-           if (*pattern == '\\') {
-               pattern++;
-               if (*pattern == '\0') {
-                   done = TRUE;
-                   break;
-               }
-           }
-           if (*(pattern + 1) == '-') {
-               c = *pattern;
-               pattern += 2;
-               if (*pattern == ']') {
-                   done = TRUE;
-                   break;
-               }
-               if (*pattern == '\\') {
-                   pattern++;
-                   if (*pattern == '\0') {
-                       done = TRUE;
-                       break;
-                   }
-               }
-               if ((*str < c) || (*str > *pattern)) {
-                   pattern++;
-                   goto repeat;
-               }
-           } else if (*pattern != *str) {
-               pattern++;
-               goto repeat;
-           }
-           pattern++;
-           while ((*pattern != ']') && (*pattern != '\0')) {
-               if ((*pattern == '\\') && (*(pattern + 1) != '\0'))
-                   pattern++;
-               pattern++;
-           }
-           if (*pattern != '\0') {
-               pattern++, str++;
-           }
-           break;
-       case '?':
-           pattern++;
-           str++;
-           break;
-       case OB:
-           pattern++;
-           while ((*pattern != CB) && (*pattern != '\0')) {
-               cp = str;
-               ok = TRUE;
-               while (ok && (*cp != '\0') && (*pattern != '\0')
-               &&  (*pattern != ',') && (*pattern != CB)) {
-                   if (*pattern == '\\')
-                       pattern++;
-                   ok = (*pattern++ == *cp++);
-               }
-               if (*pattern == '\0') {
-                   ok = FALSE;
-                   done = TRUE;
-                   break;
-               } else if (ok) {
-                   str = cp;
-                   while ((*pattern != CB) && (*pattern != '\0')) {
-                       if (*++pattern == '\\') {
-                           if (*++pattern == CB)
-                               pattern++;
-                       }
-                   }
-               } else {
-                   while (*pattern!=CB && *pattern!=',' && *pattern!='\0') {
-                       if (*++pattern == '\\') {
-                            if (*++pattern == CB || *pattern == ',')
-                               pattern++;
-                       }
-                   }
-               }
-               if (*pattern != '\0')
-                   pattern++;
-           }
-           break;
-       default:
-           if (*str == *pattern) {
-               str++, pattern++;
-           } else {
-               done = TRUE;
-           }
-       }
+    gtk_set_locale();
+    wxUpdateLocaleIsUtf8();
+}
+#endif
+
+#if wxDEBUG_LEVEL && wxUSE_STACKWALKER
+
+// private helper class
+class StackDump : public wxStackWalker
+{
+public:
+    StackDump(GtkAssertDialog *dlg) { m_dlg=dlg; }
+
+protected:
+    virtual void OnStackFrame(const wxStackFrame& frame)
+    {
+        wxString fncname = frame.GetName();
+        wxString fncargs = fncname;
+
+        size_t n = fncname.find(wxT('('));
+        if (n != wxString::npos)
+        {
+            // remove arguments from function name
+            fncname.erase(n);
+
+            // remove function name and brackets from arguments
+            fncargs = fncargs.substr(n+1, fncargs.length()-n-2);
+        }
+        else
+            fncargs = wxEmptyString;
+
+        // append this stack frame's info in the dialog
+        if (!frame.GetFileName().empty() || !fncname.empty())
+            gtk_assert_dialog_append_stack_frame(m_dlg,
+                                                fncname.mb_str(),
+                                                fncargs.mb_str(),
+                                                frame.GetFileName().mb_str(),
+                                                frame.GetLine());

     }
     }

-    while (*pattern == '*')
-       pattern++;
-    return ((*str == '\0') && (*pattern == '\0'));
+
+private:
+    GtkAssertDialog *m_dlg;

 };
 
 };
 

-//------------------------------------------------------------------------
-// subprocess routines
-//------------------------------------------------------------------------
+// the callback functions must be extern "C" to comply with GTK+ declarations
+extern "C"
+{
+    void get_stackframe_callback(StackDump *dump)
+    {
+        // skip over frames up to including wxOnAssert()
+        dump->ProcessFrames(3);
+    }
+}

 
 

-long wxExecute( char **argv, bool Async )
+#endif // wxDEBUG_LEVEL && wxUSE_STACKWALKER
+
+bool wxGUIAppTraits::ShowAssertDialog(const wxString& msg)

 {
 {

-    if (*argv == NULL)
-       return FALSE;
+#if wxDEBUG_LEVEL
+    // we can't show the dialog from another thread
+    if ( wxIsMainThread() )
+    {
+        // under GTK2 we prefer to use a dialog widget written using directly
+        // in GTK+ as use a dialog written using wxWidgets would need the
+        // wxWidgets idle processing to work correctly which might not be the
+        // case when assert happens
+        GtkWidget *dialog = gtk_assert_dialog_new();
+        gtk_assert_dialog_set_message(GTK_ASSERT_DIALOG(dialog), msg.mb_str());
+
+#if wxUSE_STACKWALKER
+        // save the current stack ow...
+        StackDump dump(GTK_ASSERT_DIALOG(dialog));
+        dump.SaveStack(100); // showing more than 100 frames is not very useful
+
+        // ...but process it only if the user needs it
+        gtk_assert_dialog_set_backtrace_callback
+        (
+            GTK_ASSERT_DIALOG(dialog),
+            (GtkAssertDialogStackFrameCallback)get_stackframe_callback,
+            &dump
+        );
+#endif // wxUSE_STACKWALKER
+
+        gint result = gtk_dialog_run(GTK_DIALOG (dialog));
+        bool returnCode = false;
+        switch (result)
+        {
+            case GTK_ASSERT_DIALOG_STOP:
+                wxTrap();
+                break;
+            case GTK_ASSERT_DIALOG_CONTINUE:
+                // nothing to do
+                break;
+            case GTK_ASSERT_DIALOG_CONTINUE_SUPPRESSING:
+                // no more asserts
+                returnCode = true;
+                break;
+
+            default:
+                wxFAIL_MSG( wxT("unexpected return code from GtkAssertDialog") );
+        }
+
+        gtk_widget_destroy(dialog);
+        return returnCode;
+    }
+#endif // wxDEBUG_LEVEL

 
 

-    /* fork the process */
-#if defined(sun) || defined(__ultrix) || defined(__bsdi__)
-    pid_t pid = vfork();
-#else
-    pid_t pid = fork();
-#endif
-    if (pid == -1) {
-       perror ("fork failed");
-       return FALSE;
-    } else if (pid == 0) {
-       /* child */
-#ifdef _AIX
-       execvp ((const char *)*argv, (const char **)argv);
-#else
-       execvp (*argv, argv);
-#endif
-       if (errno == ENOENT)
-           wxError("command not found", *argv);
-       else
-           perror (*argv);
-       wxError("could not execute", *argv);
-       _exit (-1);
+    return wxAppTraitsBase::ShowAssertDialog(msg);
+}
+
+wxString wxGUIAppTraits::GetDesktopEnvironment() const
+{
+    wxString de = wxSystemOptions::GetOption(wxT("gtk.desktop"));
+#if wxUSE_DETECT_SM
+    if ( de.empty() )
+    {
+        static const wxString s_SM = GetSM();
+
+        if (s_SM == wxT("GnomeSM"))
+            de = wxT("GNOME");
+        else if (s_SM == wxT("KDE"))
+            de = wxT("KDE");

     }
     }

+#endif // wxUSE_DETECT_SM

 
 

-    // Code below is NOT really acceptable!
-    // One should NEVER use wait under X
-    // Ideas? A Sleep idle callback?
-    // WARNING: WARNING: WARNING: WARNING:
-    // The CODE BELOW IS BAD BAD BAD BAD!
-    if (Async) {
-       int status;
-/*
-       wxSleep(2);             // Give a little time
-*/
-#if !defined(DG) && \
-    !defined(__AIX__) && \
-    !defined(__xlC__) && \
-    !defined(__SVR4__) && \
-    !defined(__SUN__) && \
-    !defined(__ALPHA__) && \
-    !defined(__SGI__) && \
-    !defined(__HPUX__) && \
-    !defined(__SUNPRO_CC) && \
-    !defined(__FreeBSD__)
-        while (wait((union wait*)&status) != pid)
-#else
-       while (wait(&status) != pid)
-#endif
-      {};
-/*
-           wxSleep(3); // 3 sec?
-*/
-    };
-    return TRUE;
-};
+    return de;
+}
+
+#ifdef __WXGTK26__

 
 

-long wxExecute( const wxString& command, bool Async )
+// see the hack below in wxCmdLineParser::GetUsageString().
+// TODO: replace this hack with a g_option_group_get_entries()
+//       call as soon as such function exists;
+//       see http://bugzilla.gnome.org/show_bug.cgi?id=431021 for the relative
+//       feature request
+struct _GOptionGroup

 {
 {

-    if (command.IsNull() || command == "") return FALSE;
-
-    int argc = 0;
-    char *argv[127];
-    char tmp[1024];
-    const char *IFS = " \t\n";
-
-    strncpy (tmp, command, sizeof(tmp) / sizeof(char) - 1);
-    tmp[sizeof (tmp) / sizeof (char) - 1] = '\0';
-    argv[argc++] = strtok (tmp, IFS);
-    while ((argv[argc++] = strtok(NULL, IFS)) != NULL)
-       /* loop */ ;
-    return wxExecute(argv, Async);
+  gchar           *name;
+  gchar           *description;
+  gchar           *help_description;
+
+  GDestroyNotify   destroy_notify;
+  gpointer         user_data;
+
+  GTranslateFunc   translate_func;
+  GDestroyNotify   translate_notify;
+  gpointer     translate_data;
+
+  GOptionEntry    *entries;
+  gint             n_entries;
+
+  GOptionParseFunc pre_parse_func;
+  GOptionParseFunc post_parse_func;
+  GOptionErrorFunc error_func;

 };
 
 };
 

+wxString wxGetNameFromGtkOptionEntry(const GOptionEntry *opt)
+{
+    wxString ret;
+
+    if (opt->short_name)
+        ret << wxT("-") << opt->short_name;
+    if (opt->long_name)
+    {
+        if (!ret.empty())
+            ret << wxT(", ");
+        ret << wxT("--") << opt->long_name;
+
+        if (opt->arg_description)
+            ret << wxT("=") << opt->arg_description;
+    }
+
+    return wxT("  ") + ret;
+}
+
+#endif // __WXGTK26__
+
+wxString
+wxGUIAppTraits::GetStandardCmdLineOptions(wxArrayString& names,
+                                          wxArrayString& desc) const
+{
+    wxString usage;
+
+#ifdef __WXGTK26__
+    if (!gtk_check_version(2,6,0))
+    {
+        // since GTK>=2.6, we can use the glib_check_version() symbol...
+
+        // check whether GLib version is greater than 2.6 but also lower than 2.19
+        // because, as we use the undocumented _GOptionGroup struct, we don't want
+        // to run this code with future versions which might change it (2.19 is the
+        // latest one at the time of this writing)
+        if (!glib_check_version(2,6,0) && glib_check_version(2,20,0))
+        {
+            usage << _("The following standard GTK+ options are also supported:\n");
+
+            // passing true here means that the function can open the default
+            // display while parsing (not really used here anyhow)
+            GOptionGroup *gtkOpts = gtk_get_option_group(true);
+
+            // WARNING: here we access the internals of GOptionGroup:
+            GOptionEntry *entries = ((_GOptionGroup*)gtkOpts)->entries;
+            unsigned int n_entries = ((_GOptionGroup*)gtkOpts)->n_entries;
+            wxArrayString namesOptions, descOptions;
+
+            for ( size_t n = 0; n < n_entries; n++ )
+            {
+                if ( entries[n].flags & G_OPTION_FLAG_HIDDEN )
+                    continue;       // skip
+
+                names.push_back(wxGetNameFromGtkOptionEntry(&entries[n]));
+
+                const gchar * const entryDesc = entries[n].description;
+                desc.push_back(wxString(entryDesc));
+            }
+
+            g_option_group_free (gtkOpts);
+        }
+    }
+#else
+    wxUnusedVar(names);
+    wxUnusedVar(desc);
+#endif // __WXGTK26__
+
+    return usage;
+}
+