Trigger wxLog auto-creation when getting old logger in wxLogChain ctor.

[wxWidgets.git] / src / common / appcmn.cpp

diff --git a/src/common/appcmn.cpp b/src/common/appcmn.cpp
index 59e2ef34c69cd746cfb487dd7b389561b702392d..9a3ead6a33da8b33425146009df9afb0fca625fc 100644 (file)
--- a/src/common/appcmn.cpp
+++ b/src/common/appcmn.cpp
@@ -1,5 +1,5 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        common/appcmn.cpp
+// Name:        src/common/appcmn.cpp

 // Purpose:     wxAppBase methods common to all platforms
 // Author:      Vadim Zeitlin
 // Modified by:
 // Purpose:     wxAppBase methods common to all platforms
 // Author:      Vadim Zeitlin
 // Modified by:


@@ -17,10 +17,6 @@
 // headers
 // ---------------------------------------------------------------------------
 
 // headers
 // ---------------------------------------------------------------------------
 

-#ifdef __GNUG__
-    #pragma implementation "appbase.h"
-#endif
-

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


@@ -30,236 +26,199 @@
 
 #ifndef WX_PRECOMP
     #include "wx/app.h"
 
 #ifndef WX_PRECOMP
     #include "wx/app.h"

-    #include "wx/intl.h"
-    #include "wx/list.h"
-    #if wxUSE_GUI
-        #include "wx/msgdlg.h"
-    #endif // wxUSE_GUI
+    #include "wx/window.h"
+    #include "wx/bitmap.h"
+    #include "wx/log.h"
+    #include "wx/msgdlg.h"
+    #include "wx/confbase.h"
+    #include "wx/utils.h"
+    #include "wx/wxcrtvararg.h"

 #endif
 
 #endif
 

+#include "wx/apptrait.h"

 #include "wx/cmdline.h"
 #include "wx/cmdline.h"

+#include "wx/msgout.h"

 #include "wx/thread.h"
 #include "wx/thread.h"

-#include "wx/confbase.h"
-
-#if !defined(__WXMSW__) || defined(__WXMICROWIN__)
-  #include  <signal.h>      // for SIGTRAP used by wxTrap()
-#endif  //Win/Unix
+#include "wx/vidmode.h"
+#include "wx/evtloop.h"

 
 

-#if defined(__WXMSW__)
-  #include  "wx/msw/private.h"  // includes windows.h for MessageBox()
-#endif
+#if wxUSE_FONTMAP
+    #include "wx/fontmap.h"
+#endif // wxUSE_FONTMAP

 
 

-#if defined(__WXMAC__)
-  #include  "wx/mac/private.h"  // includes mac headers
-#endif
+// DLL options compatibility check:
+#include "wx/build.h"
+WX_CHECK_BUILD_OPTIONS("wxCore")

 
 

-// ===========================================================================
-// implementation
-// ===========================================================================
+// ============================================================================
+// wxAppBase implementation
+// ============================================================================

 
 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------

-// initialization and termination
+// initialization

 // ----------------------------------------------------------------------------
 
 wxAppBase::wxAppBase()
 {
 // ----------------------------------------------------------------------------
 
 wxAppBase::wxAppBase()
 {

-    wxTheApp = (wxApp *)this;
-
-    // VZ: what's this? is it obsolete?
-    m_wantDebugOutput = FALSE;
-
-#if wxUSE_GUI
-    m_topWindow = (wxWindow *)NULL;
-    m_useBestVisual = FALSE;
-    m_exitOnFrameDelete = TRUE;
-    m_isActive = TRUE;
-#endif // wxUSE_GUI
+    m_topWindow = NULL;
+
+    m_useBestVisual = false;
+    m_forceTrueColour = false;
+
+    m_isActive = true;
+
+    // We don't want to exit the app if the user code shows a dialog from its
+    // OnInit() -- but this is what would happen if we set m_exitOnFrameDelete
+    // to Yes initially as this dialog would be the last top level window.
+    // OTOH, if we set it to No initially we'll have to overwrite it with Yes
+    // when we enter our OnRun() because we do want the default behaviour from
+    // then on. But this would be a problem if the user code calls
+    // SetExitOnFrameDelete(false) from OnInit().
+    //
+    // So we use the special "Later" value which is such that
+    // GetExitOnFrameDelete() returns false for it but which we know we can
+    // safely (i.e. without losing the effect of the users SetExitOnFrameDelete
+    // call) overwrite in OnRun()
+    m_exitOnFrameDelete = Later;

 }
 
 }
 

-#if wxUSE_GUI
-bool wxAppBase::OnInitGui()
+bool wxAppBase::Initialize(int& argcOrig, wxChar **argvOrig)

 {
 {

-#ifdef __WXUNIVERSAL__
-    if ( !wxTheme::Get() && !wxTheme::CreateDefault() )
-        return FALSE;
-#endif // __WXUNIVERSAL__
+    if ( !wxAppConsole::Initialize(argcOrig, argvOrig) )
+        return false;

 
 

-    return TRUE;
-}
-#endif // wxUSE_GUI
+    wxInitializeStockLists();

 
 

-int wxAppBase::OnExit()
-{
-#if wxUSE_CONFIG
-    // delete the config object if any (don't use Get() here, but Set()
-    // because Get() could create a new config object)
-    delete wxConfigBase::Set((wxConfigBase *) NULL);
-#endif // wxUSE_CONFIG
+    wxBitmap::InitStandardHandlers();

 
 

-#ifdef __WXUNIVERSAL__
-    delete wxTheme::Set(NULL);
-#endif // __WXUNIVERSAL__
+    // for compatibility call the old initialization function too
+    if ( !OnInitGui() )
+        return false;

 
 

-    return 0;
+    return true;

 }
 
 }
 

-// ---------------------------------------------------------------------------
-// wxAppBase
+// ----------------------------------------------------------------------------
+// cleanup

 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------
 

-void wxAppBase::ProcessPendingEvents()
+wxAppBase::~wxAppBase()

 {
 {

-    // ensure that we're the only thread to modify the pending events list
-    wxENTER_CRIT_SECT( *wxPendingEventsLocker );
+    // this destructor is required for Darwin
+}

 
 

-    if ( !wxPendingEvents )
-    {
-        wxLEAVE_CRIT_SECT( *wxPendingEventsLocker );
-        return;
-    }
+void wxAppBase::CleanUp()
+{
+    // clean up all the pending objects
+    DeletePendingObjects();

 
 

-    // iterate until the list becomes empty
-    wxNode *node = wxPendingEvents->First();
-    while (node)
+    // and any remaining TLWs (they remove themselves from wxTopLevelWindows
+    // when destroyed, so iterate until none are left)
+    while ( !wxTopLevelWindows.empty() )

     {
     {

-        wxEvtHandler *handler = (wxEvtHandler *)node->Data();
-        delete node;
-
-        // In ProcessPendingEvents(), new handlers might be add
-        // and we can safely leave the critical section here.
-        wxLEAVE_CRIT_SECT( *wxPendingEventsLocker );
-        handler->ProcessPendingEvents();
-        wxENTER_CRIT_SECT( *wxPendingEventsLocker );
-
-        node = wxPendingEvents->First();
+        // do not use Destroy() here as it only puts the TLW in pending list
+        // but we want to delete them now
+        delete wxTopLevelWindows.GetFirst()->GetData();

     }
 
     }
 

-    wxLEAVE_CRIT_SECT( *wxPendingEventsLocker );
-}
-
-// ----------------------------------------------------------------------------
-// misc
-// ----------------------------------------------------------------------------
-
-#if wxUSE_GUI
+    // undo everything we did in Initialize() above
+    wxBitmap::CleanUpHandlers();

 
 

-void wxAppBase::SetActive(bool active, wxWindow * WXUNUSED(lastFocus))
-{
-    if ( active == m_isActive )
-        return;
+    wxStockGDI::DeleteAll();

 
 

-    m_isActive = active;
+    wxDeleteStockLists();

 
 

-    wxActivateEvent event(wxEVT_ACTIVATE_APP, active);
-    event.SetEventObject(this);
+    wxDELETE(wxTheColourDatabase);

 
 

-    (void)ProcessEvent(event);
+    wxAppConsole::CleanUp();

 }
 
 }
 

-#endif // wxUSE_GUI
-

 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------

-// cmd line parsing
+// various accessors

 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------
 

-bool wxAppBase::OnInit()
+wxWindow* wxAppBase::GetTopWindow() const

 {
 {

-#if wxUSE_CMDLINE_PARSER
-    wxCmdLineParser parser(argc, argv);
+    wxWindow* window = m_topWindow;
+    if (window == NULL && wxTopLevelWindows.GetCount() > 0)
+        window = wxTopLevelWindows.GetFirst()->GetData();
+    return window;
+}

 
 

-    OnInitCmdLine(parser);
+wxVideoMode wxAppBase::GetDisplayMode() const
+{
+    return wxVideoMode();
+}

 
 

-    bool cont;
-    switch ( parser.Parse(FALSE /* don't show usage */) )
+wxLayoutDirection wxAppBase::GetLayoutDirection() const
+{
+#if wxUSE_INTL
+    const wxLocale *const locale = wxGetLocale();
+    if ( locale )

     {
     {

-        case -1:
-            cont = OnCmdLineHelp(parser);
-            break;
-
-        case 0:
-            cont = OnCmdLineParsed(parser);
-            break;
+        const wxLanguageInfo *const
+            info = wxLocale::GetLanguageInfo(locale->GetLanguage());

 
 

-        default:
-            cont = OnCmdLineError(parser);
-            break;
+        if ( info )
+            return info->LayoutDirection;

     }
     }

+#endif // wxUSE_INTL

 
 

-    if ( !cont )
-        return FALSE;
-#endif // wxUSE_CMDLINE_PARSER
-
-    return TRUE;
+    // we don't know
+    return wxLayout_Default;

 }
 
 #if wxUSE_CMDLINE_PARSER
 
 }
 
 #if wxUSE_CMDLINE_PARSER
 

-#define OPTION_VERBOSE _T("verbose")
-#define OPTION_THEME   _T("theme")
-#define OPTION_MODE    _T("mode")
+// ----------------------------------------------------------------------------
+// GUI-specific command line options handling
+// ----------------------------------------------------------------------------
+
+#define OPTION_THEME   "theme"
+#define OPTION_MODE    "mode"

 
 void wxAppBase::OnInitCmdLine(wxCmdLineParser& parser)
 {
 
 void wxAppBase::OnInitCmdLine(wxCmdLineParser& parser)
 {

+    // first add the standard non GUI options
+    wxAppConsole::OnInitCmdLine(parser);
+

     // the standard command line options
     // the standard command line options

-    static const wxCmdLineEntryDesc cmdLineDesc[] =
+    static const wxCmdLineEntryDesc cmdLineGUIDesc[] =

     {
     {

-        {
-            wxCMD_LINE_SWITCH,
-            _T("h"),
-            _T("help"),
-            gettext_noop("show this help message"),
-            wxCMD_LINE_VAL_NONE,
-            wxCMD_LINE_OPTION_HELP
-        },
-
-#if wxUSE_LOG
-        {
-            wxCMD_LINE_SWITCH,
-            _T(""),
-            OPTION_VERBOSE,
-            gettext_noop("generate verbose log messages")
-        },
-#endif // wxUSE_LOG
-

 #ifdef __WXUNIVERSAL__
         {
             wxCMD_LINE_OPTION,
 #ifdef __WXUNIVERSAL__
         {
             wxCMD_LINE_OPTION,

-            _T(""),
+            NULL,

             OPTION_THEME,
             gettext_noop("specify the theme to use"),
             OPTION_THEME,
             gettext_noop("specify the theme to use"),

-            wxCMD_LINE_VAL_STRING
+            wxCMD_LINE_VAL_STRING,
+            0x0

         },
 #endif // __WXUNIVERSAL__
 
         },
 #endif // __WXUNIVERSAL__
 

-#if defined(__WXMGL__)
-        // VS: this is not specific to wxMGL, all fullscreen (framebuffer) ports
+#if defined(__WXDFB__)
+        // VS: this is not specific to wxDFB, all fullscreen (framebuffer) ports

         //     should provide this option. That's why it is in common/appcmn.cpp
         //     should provide this option. That's why it is in common/appcmn.cpp

-        //     and not mgl/app.cpp
+        //     and not dfb/app.cpp

         {
             wxCMD_LINE_OPTION,
         {
             wxCMD_LINE_OPTION,

-            _T(""),
+            NULL,

             OPTION_MODE,
             gettext_noop("specify display mode to use (e.g. 640x480-16)"),
             OPTION_MODE,
             gettext_noop("specify display mode to use (e.g. 640x480-16)"),

-            wxCMD_LINE_VAL_STRING
+            wxCMD_LINE_VAL_STRING,
+            0x0

         },
         },

-#endif // __WXMGL__
+#endif // __WXDFB__

 
         // terminator
 
         // terminator

-        { wxCMD_LINE_NONE }
+        wxCMD_LINE_DESC_END

     };
 
     };
 

-    parser.SetDesc(cmdLineDesc);
+    parser.SetDesc(cmdLineGUIDesc);

 }
 
 bool wxAppBase::OnCmdLineParsed(wxCmdLineParser& parser)
 {
 }
 
 bool wxAppBase::OnCmdLineParsed(wxCmdLineParser& parser)
 {

-#if wxUSE_LOG
-    if ( parser.Found(OPTION_VERBOSE) )
-    {
-        wxLog::SetVerbose(TRUE);
-    }
-#endif // wxUSE_LOG
-

 #ifdef __WXUNIVERSAL__
     wxString themeName;
     if ( parser.Found(OPTION_THEME, &themeName) )
 #ifdef __WXUNIVERSAL__
     wxString themeName;
     if ( parser.Found(OPTION_THEME, &themeName) )


@@ -268,195 +227,261 @@ bool wxAppBase::OnCmdLineParsed(wxCmdLineParser& parser)
         if ( !theme )
         {
             wxLogError(_("Unsupported theme '%s'."), themeName.c_str());
         if ( !theme )
         {
             wxLogError(_("Unsupported theme '%s'."), themeName.c_str());

-
-            return FALSE;
+            return false;

         }
 
         }
 

+        // Delete the defaultly created theme and set the new theme.
+        delete wxTheme::Get();

         wxTheme::Set(theme);
     }
 #endif // __WXUNIVERSAL__
 
         wxTheme::Set(theme);
     }
 #endif // __WXUNIVERSAL__
 

-#if defined(__WXMGL__)
+#if defined(__WXDFB__)

     wxString modeDesc;
     if ( parser.Found(OPTION_MODE, &modeDesc) )
     {
         unsigned w, h, bpp;
     wxString modeDesc;
     if ( parser.Found(OPTION_MODE, &modeDesc) )
     {
         unsigned w, h, bpp;

-        if ( wxSscanf(modeDesc.c_str(), _T("%ux%u-%u"), &w, &h, &bpp) != 3 )
+        if ( wxSscanf(modeDesc.c_str(), wxT("%ux%u-%u"), &w, &h, &bpp) != 3 )

         {
             wxLogError(_("Invalid display mode specification '%s'."), modeDesc.c_str());
         {
             wxLogError(_("Invalid display mode specification '%s'."), modeDesc.c_str());

-
-            return FALSE;
+            return false;

         }
 
         }
 

-        if ( !SetDisplayMode(wxDisplayModeInfo(w, h, bpp)) )
-            return FALSE;
+        if ( !SetDisplayMode(wxVideoMode(w, h, bpp)) )
+            return false;

     }
     }

-#endif // __WXMGL__
+#endif // __WXDFB__

 
 

-    return TRUE;
+    return wxAppConsole::OnCmdLineParsed(parser);

 }
 
 }
 

-bool wxAppBase::OnCmdLineHelp(wxCmdLineParser& parser)
+#endif // wxUSE_CMDLINE_PARSER
+
+// ----------------------------------------------------------------------------
+// OnXXX() hooks
+// ----------------------------------------------------------------------------
+
+bool wxAppBase::OnInitGui()

 {
 {

-    parser.Usage();
+#ifdef __WXUNIVERSAL__
+    if ( !wxTheme::Get() && !wxTheme::CreateDefault() )
+        return false;
+#endif // __WXUNIVERSAL__

 
 

-    return FALSE;
+    return true;

 }
 
 }
 

-bool wxAppBase::OnCmdLineError(wxCmdLineParser& parser)
+int wxAppBase::OnRun()

 {
 {

-    parser.Usage();
+    // see the comment in ctor: if the initial value hasn't been changed, use
+    // the default Yes from now on
+    if ( m_exitOnFrameDelete == Later )
+    {
+        m_exitOnFrameDelete = Yes;
+    }
+    //else: it has been changed, assume the user knows what he is doing

 
 

-    return FALSE;
+    return wxAppConsole::OnRun();

 }
 
 }
 

-#endif // wxUSE_CMDLINE_PARSER
+int wxAppBase::OnExit()
+{
+#ifdef __WXUNIVERSAL__
+    delete wxTheme::Set(NULL);
+#endif // __WXUNIVERSAL__
+
+    return wxAppConsole::OnExit();
+}
+
+wxAppTraits *wxAppBase::CreateTraits()
+{
+    return new wxGUIAppTraits;
+}

 
 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------

-// debugging support
+// misc

 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------
 

-#ifdef  __WXDEBUG__
+void wxAppBase::SetActive(bool active, wxWindow * WXUNUSED(lastFocus))
+{
+    if ( active == m_isActive )
+        return;
+
+    m_isActive = active;
+
+    wxActivateEvent event(wxEVT_ACTIVATE_APP, active);
+    event.SetEventObject(this);

 
 

-// wxASSERT() helper
-bool wxAssertIsEqual(int x, int y)
+    (void)ProcessEvent(event);
+}
+
+bool wxAppBase::SafeYield(wxWindow *win, bool onlyIfNeeded)

 {
 {

-    return x == y;
+    wxWindowDisabler wd(win);
+
+    wxEventLoopBase * const loop = wxEventLoopBase::GetActive();
+
+    return loop && loop->Yield(onlyIfNeeded);

 }
 
 }
 

-// break into the debugger
-void wxTrap()
+bool wxAppBase::SafeYieldFor(wxWindow *win, long eventsToProcess)

 {
 {

-#if defined(__WXMSW__) && !defined(__WXMICROWIN__)
-    DebugBreak();
-#elif defined(__WXMAC__) && !defined(__DARWIN__)
-#if __powerc
-    Debugger();
-#else
-    SysBreak();
-#endif
-#elif defined(__UNIX__)
-    raise(SIGTRAP);
-#else
-    // TODO
-#endif // Win/Unix
+    wxWindowDisabler wd(win);
+
+    wxEventLoopBase * const loop = wxEventLoopBase::GetActive();
+
+    return loop && loop->YieldFor(eventsToProcess);

 }
 
 }
 

-// show the assert modal dialog
-static
-void ShowAssertDialog(const wxChar *szFile, int nLine, const wxChar *szMsg)
+
+// ----------------------------------------------------------------------------
+// idle handling
+// ----------------------------------------------------------------------------
+
+// Returns true if more time is needed.
+bool wxAppBase::ProcessIdle()

 {
 {

-    // this variable can be set to true to suppress "assert failure" messages
-    static bool s_bNoAsserts = FALSE;
-
-    wxChar szBuf[4096];
-
-    // make life easier for people using VC++ IDE: clicking on the message
-    // will take us immediately to the place of the failed assert
-    wxSnprintf(szBuf, WXSIZEOF(szBuf),
-#ifdef __VISUALC__
-               wxT("%s(%d): assert failed"),
-#else  // !VC++
-    // make the error message more clear for all the others
-               wxT("Assert failed in file %s at line %d"),
-#endif // VC/!VC
-               szFile, nLine);
-
-    if ( szMsg != NULL )
-    {
-        wxStrcat(szBuf, wxT(": "));
-        wxStrcat(szBuf, szMsg);
-    }
-    else // no message given
+    // call the base class version first to send the idle event to wxTheApp
+    // itself
+    bool needMore = wxAppConsoleBase::ProcessIdle();
+    wxIdleEvent event;
+    wxWindowList::compatibility_iterator node = wxTopLevelWindows.GetFirst();
+    while (node)

     {
     {

-        wxStrcat(szBuf, wxT("."));
+        wxWindow* win = node->GetData();
+
+        // Don't send idle events to the windows that are about to be destroyed
+        // anyhow, this is wasteful and unexpected.
+        if ( !wxPendingDelete.Member(win) && win->SendIdleEvents(event) )
+            needMore = true;
+        node = node->GetNext();

     }
 
     }
 

-    if ( !s_bNoAsserts )
-    {
-        // send it to the normal log destination
-        wxLogDebug(szBuf);
+    wxUpdateUIEvent::ResetUpdateTime();

 
 

-#if (wxUSE_GUI && wxUSE_MSGDLG) || defined(__WXMSW__)
-        // this message is intentionally not translated - it is for
-        // developpers only
-        wxStrcat(szBuf, wxT("\nDo you want to stop the program?\nYou can also choose [Cancel] to suppress further warnings."));
+    return needMore;
+}

 
 

-        // use the native message box if available: this is more robust than
-        // using our own
-#if defined(__WXMSW__) && !defined(__WXMICROWIN__)
-        switch ( ::MessageBox(NULL, szBuf, _T("Debug"),
-                              MB_YESNOCANCEL | MB_ICONSTOP ) )
-        {
-            case IDYES:
-                wxTrap();
-                break;
+// ----------------------------------------------------------------------------
+// wxGUIAppTraitsBase
+// ----------------------------------------------------------------------------

 
 

-            case IDCANCEL:
-                s_bNoAsserts = TRUE;
-                break;
+#if wxUSE_LOG

 
 

-            //case IDNO: nothing to do
-        }
-#else // !MSW
-        switch ( wxMessageBox(szBuf, wxT("Debug"),
-                              wxYES_NO | wxCANCEL | wxICON_STOP ) )
-        {
-            case wxYES:
-                wxTrap();
-                break;
+wxLog *wxGUIAppTraitsBase::CreateLogTarget()
+{
+#if wxUSE_LOGGUI
+#ifndef __WXOSX_IPHONE__
+    return new wxLogGui;
+#else
+    return new wxLogStderr;
+#endif
+#else
+    // we must have something!
+    return new wxLogStderr;
+#endif
+}

 
 

-            case wxCANCEL:
-                s_bNoAsserts = TRUE;
-                break;
+#endif // wxUSE_LOG

 
 

-            //case wxNO: nothing to do
-        }
-#endif // GUI or MSW
+wxMessageOutput *wxGUIAppTraitsBase::CreateMessageOutput()
+{
+    // The standard way of printing help on command line arguments (app --help)
+    // is (according to common practice):
+    //     - console apps: to stderr (on any platform)
+    //     - GUI apps: stderr on Unix platforms (!)
+    //                 stderr if available and message box otherwise on others
+    //                 (currently stderr only Windows if app running from console)
+#ifdef __UNIX__
+    return new wxMessageOutputStderr;
+#else // !__UNIX__
+    // wxMessageOutputMessageBox doesn't work under Motif
+    #ifdef __WXMOTIF__
+        return new wxMessageOutputLog;
+    #elif wxUSE_MSGDLG
+        return new wxMessageOutputBest(wxMSGOUT_PREFER_STDERR);
+    #else
+        return new wxMessageOutputStderr;
+    #endif
+#endif // __UNIX__/!__UNIX__
+}

 
 

-#else // !GUI
-        wxTrap();
-#endif // GUI/!GUI
-    }
+#if wxUSE_FONTMAP
+
+wxFontMapper *wxGUIAppTraitsBase::CreateFontMapper()
+{
+    return new wxFontMapper;

 }
 
 }
 

-// this function is called when an assert fails
-void wxOnAssert(const wxChar *szFile, int nLine, const wxChar *szMsg)
+#endif // wxUSE_FONTMAP
+
+wxRendererNative *wxGUIAppTraitsBase::CreateRenderer()

 {
 {

-    // FIXME MT-unsafe
-    static bool s_bInAssert = FALSE;
+    // use the default native renderer by default
+    return NULL;
+}

 
 

-    if ( s_bInAssert )
+bool wxGUIAppTraitsBase::ShowAssertDialog(const wxString& msg)
+{
+#if wxDEBUG_LEVEL
+    // under MSW we prefer to use the base class version using ::MessageBox()
+    // even if wxMessageBox() is available because it has less chances to
+    // double fault our app than our wxMessageBox()
+    //
+    // under DFB the message dialog is not always functional right now
+    //
+    // and finally we can't use wxMessageBox() if it wasn't compiled in, of
+    // course
+#if !defined(__WXMSW__) && !defined(__WXDFB__) && wxUSE_MSGDLG
+
+    // we can't (safely) show the GUI dialog from another thread, only do it
+    // for the asserts in the main thread
+    if ( wxIsMainThread() )

     {
     {

-        // He-e-e-e-elp!! we're trapped in endless loop
-        wxTrap();
+        wxString msgDlg = msg;

 
 

-        s_bInAssert = FALSE;
+#if wxUSE_STACKWALKER
+        const wxString stackTrace = GetAssertStackTrace();
+        if ( !stackTrace.empty() )
+            msgDlg << wxT("\n\nCall stack:\n") << stackTrace;
+#endif // wxUSE_STACKWALKER

 
 

-        return;
-    }
+        // this message is intentionally not translated -- it is for
+        // developpers only
+        msgDlg += wxT("\nDo you want to stop the program?\n")
+                  wxT("You can also choose [Cancel] to suppress ")
+                  wxT("further warnings.");

 
 

-    s_bInAssert = TRUE;
+        switch ( wxMessageBox(msgDlg, wxT("wxWidgets Debug Alert"),
+                              wxYES_NO | wxCANCEL | wxICON_STOP ) )
+        {
+            case wxYES:
+                wxTrap();
+                break;

 
 

-    if ( !wxTheApp )
-    {
-        // by default, show the assert dialog box - we can't customize this
-        // behaviour
-        ShowAssertDialog(szFile, nLine, szMsg);
-    }
-    else
-    {
-        // let the app process it as it wants
-        wxTheApp->OnAssert(szFile, nLine, szMsg);
+            case wxCANCEL:
+                // no more asserts
+                return true;
+
+            //case wxNO: nothing to do
+        }
+
+        return false;

     }
     }

+#endif // wxUSE_MSGDLG
+#endif // wxDEBUG_LEVEL

 
 

-    s_bInAssert = FALSE;
+    return wxAppTraitsBase::ShowAssertDialog(msg);

 }
 
 }
 

-void wxAppBase::OnAssert(const wxChar *file, int line, const wxChar *msg)
+bool wxGUIAppTraitsBase::HasStderr()

 {
 {

-    ShowAssertDialog(file, line, msg);
+    // we consider that under Unix stderr always goes somewhere, even if the
+    // user doesn't always see it under GUI desktops
+#ifdef __UNIX__
+    return true;
+#else
+    return false;
+#endif

 }
 
 }
 

-#endif  //WXDEBUG
-