X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/7532d2928e45ad2c541dea3e937a71a337d4e54a..ea1795398a32fe1573b50432ce199c9fe3324519:/src/common/appcmn.cpp

diff --git a/src/common/appcmn.cpp b/src/common/appcmn.cpp
index 11493d4ba9..6eb1fc78d4 100644
--- 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:
@@ -17,10 +17,6 @@
 // headers
 // ---------------------------------------------------------------------------
 
-#ifdef __GNUG__
-    #pragma implementation "appbase.h"
-#endif
-
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
@@ -30,64 +26,46 @@
 
 #ifndef WX_PRECOMP
     #include "wx/app.h"
-    #include "wx/intl.h"
-    #include "wx/list.h"
-    #if wxUSE_LOG
-        #include "wx/log.h"
-    #endif // wxUSE_LOG
-    #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
 
+#include "wx/apptrait.h"
 #include "wx/cmdline.h"
-#include "wx/thread.h"
-#include "wx/confbase.h"
-#include "wx/tokenzr.h"
-#include "wx/utils.h"
 #include "wx/msgout.h"
+#include "wx/thread.h"
+#include "wx/vidmode.h"
+#include "wx/evtloop.h"
 
-#if wxUSE_GUI
-    #include "wx/artprov.h"
-#endif // wxUSE_GUI
-
-#if !defined(__WXMSW__) || defined(__WXMICROWIN__)
-  #include  <signal.h>      // for SIGTRAP used by wxTrap()
-#endif  //Win/Unix
-
-#if defined(__WXMSW__)
-  #include  "wx/msw/private.h"  // includes windows.h for MessageBox()
-#endif
-
-#if defined(__WXMAC__)
-  #include  "wx/mac/private.h"  // includes mac headers
-#endif
+#if wxUSE_FONTMAP
+    #include "wx/fontmap.h"
+#endif // wxUSE_FONTMAP
 
-// private functions prototypes
-#ifdef __WXDEBUG__
-    static void LINKAGEMODE SetTraceMasks();
-#endif // __WXDEBUG__
+// DLL options compatibility check:
+#include "wx/build.h"
+WX_CHECK_BUILD_OPTIONS("wxCore")
 
-// ===========================================================================
-// implementation
-// ===========================================================================
+// ============================================================================
+// wxAppBase implementation
+// ============================================================================
 
 // ----------------------------------------------------------------------------
-// initialization and termination
+// initialization
 // ----------------------------------------------------------------------------
 
 wxAppBase::wxAppBase()
 {
-    wxTheApp = (wxApp *)this;
+    m_topWindow = NULL;
 
-#if WXWIN_COMPATIBILITY_2_2
-    m_wantDebugOutput = FALSE;
-#endif // WXWIN_COMPATIBILITY_2_2
+    m_useBestVisual = false;
+    m_forceTrueColour = false;
 
-#if wxUSE_GUI
-    m_topWindow = (wxWindow *)NULL;
-    m_useBestVisual = FALSE;
-    m_isActive = TRUE;
+    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
@@ -95,237 +73,122 @@ wxAppBase::wxAppBase()
     // 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().
+    // 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
+    // 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;
-#endif // wxUSE_GUI
-
-#ifdef __WXDEBUG__
-    SetTraceMasks();
-#endif
 }
 
-wxAppBase::~wxAppBase()
+bool wxAppBase::Initialize(int& argcOrig, wxChar **argvOrig)
 {
-    // this destructor is required for Darwin
-}
+    if ( !wxAppConsole::Initialize(argcOrig, argvOrig) )
+        return false;
 
-#if wxUSE_GUI
+    wxInitializeStockLists();
 
-bool wxAppBase::OnInitGui()
-{
-#ifdef __WXUNIVERSAL__
-    if ( !wxTheme::Get() && !wxTheme::CreateDefault() )
-        return FALSE;
-#endif // __WXUNIVERSAL__
+    wxBitmap::InitStandardHandlers();
 
-    return TRUE;
-}
+    // for compatibility call the old initialization function too
+    if ( !OnInitGui() )
+        return false;
 
-int wxAppBase::OnRun()
-{
-    // 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 MainLoop();
-}
-
-#endif // wxUSE_GUI
-
-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
-
-#ifdef __WXUNIVERSAL__
-    delete wxTheme::Set(NULL);
-#endif // __WXUNIVERSAL__
-
-    // use Set(NULL) and not Get() to avoid creating a message output object on
-    // demand when we just want to delete it
-    delete wxMessageOutput::Set(NULL);
-
-    return 0;
+    return true;
 }
 
 // ----------------------------------------------------------------------------
-// customization hooks
+// cleanup
 // ----------------------------------------------------------------------------
 
-#if wxUSE_LOG
-
-wxLog *wxAppBase::CreateLogTarget()
-{
-#if wxUSE_GUI && wxUSE_LOGGUI && !defined(__WXMICROWIN__)
-    return new wxLogGui;
-#else // !GUI
-    return new wxLogStderr;
-#endif // wxUSE_GUI
-}
-
-#endif // wxUSE_LOG
-
-wxMessageOutput *wxAppBase::CreateMessageOutput()
+wxAppBase::~wxAppBase()
 {
-    // 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 (!)
-    //                 message box under Windows and others
-#if wxUSE_GUI && !defined(__UNIX__)
-    // wxMessageOutputMessageBox doesn't work under Motif
-    #ifdef __WXMOTIF__
-        return new wxMessageOutputLog;
-    #else
-        return new wxMessageOutputMessageBox;
-    #endif
-#else // !wxUSE_GUI || __UNIX__
-    return new wxMessageOutputStderr;
-#endif
+    // this destructor is required for Darwin
 }
 
-// ---------------------------------------------------------------------------
-// wxAppBase
-// ----------------------------------------------------------------------------
-
-void wxAppBase::ProcessPendingEvents()
+void wxAppBase::CleanUp()
 {
-    // ensure that we're the only thread to modify the pending events list
-    wxENTER_CRIT_SECT( *wxPendingEventsLocker );
+    // clean up all the pending objects
+    DeletePendingObjects();
 
-    if ( !wxPendingEvents )
+    // and any remaining TLWs (they remove themselves from wxTopLevelWindows
+    // when destroyed, so iterate until none are left)
+    while ( !wxTopLevelWindows.empty() )
     {
-        wxLEAVE_CRIT_SECT( *wxPendingEventsLocker );
-        return;
+        // 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();
     }
 
-    // iterate until the list becomes empty
-    wxNode *node = wxPendingEvents->GetFirst();
-    while (node)
-    {
-        wxEvtHandler *handler = (wxEvtHandler *)node->GetData();
-        delete node;
+    // undo everything we did in Initialize() above
+    wxBitmap::CleanUpHandlers();
 
-        // 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 );
+    wxStockGDI::DeleteAll();
 
-        node = wxPendingEvents->GetFirst();
-    }
+    wxDeleteStockLists();
+
+    wxDELETE(wxTheColourDatabase);
 
-    wxLEAVE_CRIT_SECT( *wxPendingEventsLocker );
+    wxAppConsole::CleanUp();
 }
 
 // ----------------------------------------------------------------------------
-// misc
+// various accessors
 // ----------------------------------------------------------------------------
 
-#if wxUSE_GUI
-
-void wxAppBase::SetActive(bool active, wxWindow * WXUNUSED(lastFocus))
+wxWindow* wxAppBase::GetTopWindow() const
 {
-    if ( active == m_isActive )
-        return;
-
-    m_isActive = active;
-
-    wxActivateEvent event(wxEVT_ACTIVATE_APP, active);
-    event.SetEventObject(this);
-
-    (void)ProcessEvent(event);
+    wxWindow* window = m_topWindow;
+    if (window == NULL && wxTopLevelWindows.GetCount() > 0)
+        window = wxTopLevelWindows.GetFirst()->GetData();
+    return window;
 }
 
-#endif // wxUSE_GUI
-
-int wxAppBase::FilterEvent(wxEvent& WXUNUSED(event))
+wxVideoMode wxAppBase::GetDisplayMode() const
 {
-    // process the events normally by default
-    return -1;
+    return wxVideoMode();
 }
 
-// ----------------------------------------------------------------------------
-// cmd line parsing
-// ----------------------------------------------------------------------------
-
-bool wxAppBase::OnInit()
+wxLayoutDirection wxAppBase::GetLayoutDirection() const
 {
-#if wxUSE_CMDLINE_PARSER
-    wxCmdLineParser parser(argc, argv);
-
-    OnInitCmdLine(parser);
-
-    bool cont;
-    switch ( parser.Parse(FALSE /* don't show usage */) )
+#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
 
-#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)
 {
+    // first add the standard non GUI options
+    wxAppConsole::OnInitCmdLine(parser);
+
     // 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"),
-            wxCMD_LINE_VAL_NONE,
-            0x0
-        },
-#endif // wxUSE_LOG
-
 #ifdef __WXUNIVERSAL__
         {
             wxCMD_LINE_OPTION,
-            _T(""),
+            NULL,
             OPTION_THEME,
             gettext_noop("specify the theme to use"),
             wxCMD_LINE_VAL_STRING,
@@ -339,7 +202,7 @@ void wxAppBase::OnInitCmdLine(wxCmdLineParser& parser)
         //     and not mgl/app.cpp
         {
             wxCMD_LINE_OPTION,
-            _T(""),
+            NULL,
             OPTION_MODE,
             gettext_noop("specify display mode to use (e.g. 640x480-16)"),
             wxCMD_LINE_VAL_STRING,
@@ -348,28 +211,14 @@ void wxAppBase::OnInitCmdLine(wxCmdLineParser& parser)
 #endif // __WXMGL__
 
         // terminator
-        {
-            wxCMD_LINE_NONE,
-            _T(""),
-            _T(""),
-            _T(""),
-            wxCMD_LINE_VAL_NONE,
-            0x0
-        }
+        wxCMD_LINE_DESC_END
     };
 
-    parser.SetDesc(cmdLineDesc);
+    parser.SetDesc(cmdLineGUIDesc);
 }
 
 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) )
@@ -377,11 +226,8 @@ bool wxAppBase::OnCmdLineParsed(wxCmdLineParser& parser)
         wxTheme *theme = wxTheme::Create(themeName);
         if ( !theme )
         {
-#if wxUSE_LOG
             wxLogError(_("Unsupported theme '%s'."), themeName.c_str());
-#endif
-
-            return FALSE;
+            return false;
         }
 
         // Delete the defaultly created theme and set the new theme.
@@ -395,196 +241,215 @@ bool wxAppBase::OnCmdLineParsed(wxCmdLineParser& parser)
     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 )
         {
-#if wxUSE_LOG
             wxLogError(_("Invalid display mode specification '%s'."), modeDesc.c_str());
-#endif
-            return FALSE;
+            return false;
         }
 
-        if ( !SetDisplayMode(wxDisplayModeInfo(w, h, bpp)) )
-            return FALSE;
+        if ( !SetDisplayMode(wxVideoMode(w, h, bpp)) )
+            return false;
     }
 #endif // __WXMGL__
 
-    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 true;
+}
+
+int wxAppBase::OnRun()
+{
+    // 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();
 }
 
-bool wxAppBase::OnCmdLineError(wxCmdLineParser& parser)
+int wxAppBase::OnExit()
 {
-    parser.Usage();
+#ifdef __WXUNIVERSAL__
+    delete wxTheme::Set(NULL);
+#endif // __WXUNIVERSAL__
 
-    return FALSE;
+    return wxAppConsole::OnExit();
 }
 
-#endif // wxUSE_CMDLINE_PARSER
+wxAppTraits *wxAppBase::CreateTraits()
+{
+    return new wxGUIAppTraits;
+}
 
 // ----------------------------------------------------------------------------
-// debugging support
+// misc
 // ----------------------------------------------------------------------------
 
-/* static */
-bool wxAppBase::CheckBuildOptions(const wxBuildOptions& opts)
+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);
+
+    (void)ProcessEvent(event);
+}
+
+bool wxAppBase::SafeYield(wxWindow *win, bool onlyIfNeeded)
 {
-#define wxCMP(what)   (what == opts.m_ ## what)
+    wxWindowDisabler wd(win);
 
-    bool
-#ifdef __WXDEBUG__
-    isDebug = TRUE;
-#else
-    isDebug = FALSE;
-#endif
+    wxEventLoopBase * const loop = wxEventLoopBase::GetActive();
 
-    int verMaj = wxMAJOR_VERSION,
-        verMin = wxMINOR_VERSION;
+    return loop && loop->Yield(onlyIfNeeded);
+}
 
-    if ( !(wxCMP(isDebug) && wxCMP(verMaj) && wxCMP(verMin)) )
-    {
-        wxString msg;
-        wxString libDebug, progDebug;
-
-        if (isDebug)
-            libDebug = wxT("debug");
-        else
-            libDebug = wxT("no debug");
-
-        if (opts.m_isDebug)
-            progDebug = wxT("debug");
-        else
-            progDebug = wxT("no debug");
-        
-        msg.Printf(_T("Mismatch between the program and library build versions detected.\nThe library used %d.%d (%s), and your program used %d.%d (%s)."),
-                   verMaj, verMin, libDebug.c_str(), opts.m_verMaj, opts.m_verMin, progDebug.c_str());
-        
-#if wxUSE_LOG
-        wxLogFatalError(msg);
-#endif
+bool wxAppBase::SafeYieldFor(wxWindow *win, long eventsToProcess)
+{
+    wxWindowDisabler wd(win);
 
-        // normally wxLogFatalError doesn't return
-        return FALSE;
-    }
-#undef wxCMP
+    wxEventLoopBase * const loop = wxEventLoopBase::GetActive();
 
-    return TRUE;
+    return loop && loop->YieldFor(eventsToProcess);
 }
 
-#ifdef  __WXDEBUG__
 
-static void LINKAGEMODE SetTraceMasks()
+// ----------------------------------------------------------------------------
+// idle handling
+// ----------------------------------------------------------------------------
+
+// Returns true if more time is needed.
+bool wxAppBase::ProcessIdle()
 {
-#if wxUSE_LOG
-    wxString mask;
-    if ( wxGetEnv(wxT("WXTRACE"), &mask) )
+    // 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)
     {
-        wxStringTokenizer tkn(mask, wxT(","));
-        while ( tkn.HasMoreTokens() )
-            wxLog::AddTraceMask(tkn.GetNextToken());
+        wxWindow* win = node->GetData();
+        if (win->SendIdleEvents(event))
+            needMore = true;
+        node = node->GetNext();
     }
-#endif // wxUSE_LOG
-}
 
-// wxASSERT() helper
-bool wxAssertIsEqual(int x, int y)
-{
-    return x == y;
+    wxUpdateUIEvent::ResetUpdateTime();
+
+    return needMore;
 }
 
-// break into the debugger
-void wxTrap()
+// ----------------------------------------------------------------------------
+// wxGUIAppTraitsBase
+// ----------------------------------------------------------------------------
+
+#if wxUSE_LOG
+
+wxLog *wxGUIAppTraitsBase::CreateLogTarget()
 {
-#if defined(__WXMSW__) && !defined(__WXMICROWIN__)
-    DebugBreak();
-#elif defined(__WXMAC__) && !defined(__DARWIN__)
-#if __powerc
-    Debugger();
+#if wxUSE_LOGGUI
+#ifndef __WXOSX_IPHONE__
+    return new wxLogGui;
 #else
-    SysBreak();
+    return new wxLogStderr;
 #endif
-#elif defined(__UNIX__)
-    raise(SIGTRAP);
 #else
-    // TODO
-#endif // Win/Unix
+    // we must have something!
+    return new wxLogStderr;
+#endif
 }
 
+#endif // wxUSE_LOG
 
-void wxAssert(int cond,
-                  const wxChar *szFile,
-                  int nLine,
-                  const wxChar *szCond,
-                  const wxChar *szMsg) 
+wxMessageOutput *wxGUIAppTraitsBase::CreateMessageOutput()
 {
-   if ( !cond )
-          wxOnAssert(szFile, nLine, szCond, szMsg);
+    // 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__
 }
-  
-// show the assert modal dialog
-static
-void ShowAssertDialog(const wxChar *szFile,
-                      int nLine,
-                      const wxChar *szCond,
-                      const wxChar *szMsg)
+
+#if wxUSE_FONTMAP
+
+wxFontMapper *wxGUIAppTraitsBase::CreateFontMapper()
 {
-    // this variable can be set to true to suppress "assert failure" messages
-    static bool s_bNoAsserts = FALSE;
+    return new wxFontMapper;
+}
 
-    wxChar szBuf[4096];
+#endif // wxUSE_FONTMAP
 
-    // make life easier for people using VC++ IDE by using this format: like
-    // this, clicking on the message will take us immediately to the place of
-    // the failed assert
-    wxSnprintf(szBuf, WXSIZEOF(szBuf),
-               wxT("%s(%d): assert \"%s\" failed"),
-               szFile, nLine, szCond);
+wxRendererNative *wxGUIAppTraitsBase::CreateRenderer()
+{
+    // use the default native renderer by default
+    return NULL;
+}
 
-    if ( szMsg != NULL )
-    {
-        wxStrcat(szBuf, wxT(": "));
-        wxStrcat(szBuf, szMsg);
-    }
-    else // no message given
-    {
-        wxStrcat(szBuf, wxT("."));
-    }
+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
 
-    if ( !s_bNoAsserts )
+    // we can't (safely) show the GUI dialog from another thread, only do it
+    // for the asserts in the main thread
+    if ( wxIsMainThread() )
     {
-#if wxUSE_LOG
-        // send it to the normal log destination
-        wxLogDebug(szBuf);
-#endif
-
-#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."));
+        wxString msgDlg = msg;
 
-        // 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;
+#if wxUSE_STACKWALKER
+        const wxString stackTrace = GetAssertStackTrace();
+        if ( !stackTrace.empty() )
+            msgDlg << wxT("\n\nCall stack:\n") << stackTrace;
+#endif // wxUSE_STACKWALKER
 
-            case IDCANCEL:
-                s_bNoAsserts = TRUE;
-                break;
+        // 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.");
 
-            //case IDNO: nothing to do
-        }
-#else // !MSW
-        switch ( wxMessageBox(szBuf, wxT("Debug"),
+        switch ( wxMessageBox(msgDlg, wxT("wxWidgets Debug Alert"),
                               wxYES_NO | wxCANCEL | wxICON_STOP ) )
         {
             case wxYES:
@@ -592,62 +457,28 @@ void ShowAssertDialog(const wxChar *szFile,
                 break;
 
             case wxCANCEL:
-                s_bNoAsserts = TRUE;
-                break;
+                // no more asserts
+                return true;
 
             //case wxNO: nothing to do
         }
-#endif // GUI or MSW
-
-#else // !GUI
-        wxTrap();
-#endif // GUI/!GUI
-    }
-}
 
-// this function is called when an assert fails
-void wxOnAssert(const wxChar *szFile,
-                int nLine,
-                const wxChar *szCond,
-                const wxChar *szMsg)
-{
-    // FIXME MT-unsafe
-    static bool s_bInAssert = FALSE;
-
-    if ( s_bInAssert )
-    {
-        // He-e-e-e-elp!! we're trapped in endless loop
-        wxTrap();
-
-        s_bInAssert = FALSE;
-
-        return;
+        return false;
     }
+#endif // wxUSE_MSGDLG
+#endif // wxDEBUG_LEVEL
 
-    s_bInAssert = TRUE;
-
-    if ( !wxTheApp )
-    {
-        // by default, show the assert dialog box - we can't customize this
-        // behaviour
-        ShowAssertDialog(szFile, nLine, szCond, szMsg);
-    }
-    else
-    {
-        // let the app process it as it wants
-        wxTheApp->OnAssert(szFile, nLine, szCond, szMsg);
-    }
-
-    s_bInAssert = FALSE;
+    return wxAppTraitsBase::ShowAssertDialog(msg);
 }
 
-void wxAppBase::OnAssert(const wxChar *file,
-                         int line,
-                         const wxChar *cond,
-                         const wxChar *msg)
+bool wxGUIAppTraitsBase::HasStderr()
 {
-    ShowAssertDialog(file, line, cond, 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
-