Use wxApp::GetTraitsIfExists() wrappers when applicable

This is simpler and more clear than testing wxTheApp explicitly.

No real changes.

src/common/appbase.cpp

@@ -358,7 +358,7 @@ wxAppTraits *wxAppConsoleBase::GetTraitsIfExists()
 wxAppTraits& wxAppConsoleBase::GetValidTraits()
 {
     static wxConsoleAppTraits s_traitsConsole;
-    wxAppTraits* const traits = (wxTheApp ? wxTheApp->GetTraits() : NULL);
+    wxAppTraits* const traits = GetTraitsIfExists();
 
     return *(traits ? traits : &s_traitsConsole);
 }

src/common/cmdline.cpp

@@ -1430,9 +1430,8 @@ wxString wxCmdLineParser::GetUsageString() const
     count = namesOptions.size();
 
     // get option names & descriptions for standard options, if any:
-    wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
     wxString stdDesc;
-    if ( traits )
+    if ( wxAppTraits *traits = wxApp::GetTraitsIfExists() )
         stdDesc = traits->GetStandardCmdLineOptions(namesOptions, descOptions);
 
     // now construct the detailed help message

src/common/config.cpp

@@ -98,7 +98,7 @@ wxConfigBase *wxConfigBase::Set(wxConfigBase *pConfig)
 wxConfigBase *wxConfigBase::Create()
 {
   if ( ms_bAutoCreate && ms_pConfig == NULL ) {
-    wxAppTraits * const traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
+    wxAppTraits * const traits = wxApp::GetTraitsIfExists();
     wxCHECK_MSG( traits, NULL, wxT("create wxApp before calling this") );
 
     ms_pConfig = traits->CreateConfig();

src/common/fmapbase.cpp

@@ -413,7 +413,7 @@ wxFontMapperBase *wxFontMapperBase::Get()
 {
     if ( !sm_instance )
     {
-        wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
+        wxAppTraits *traits = wxApp::GetTraitsIfExists();
         if ( traits )
         {
             sm_instance = traits->CreateFontMapper();

src/common/log.cpp

@@ -892,7 +892,7 @@ void wxLogStderr::DoLogText(const wxString& msg)
     // simply lost
     if ( m_fp == stderr )
     {
-        wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
+        wxAppTraits *traits = wxApp::GetTraitsIfExists();
         if ( traits && !traits->HasStderr() )
         {
             wxMessageOutputDebug().Output(msg + wxS('\n'));

src/common/msgout.cpp

@@ -105,7 +105,7 @@ void wxMessageOutputBest::Output(const wxString& str)
 {
 #ifdef __WINDOWS__
     // decide whether to use console output or not
-    wxAppTraits * const traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
+    wxAppTraits * const traits = wxApp::GetTraitsIfExists();
     const bool hasStderr = traits ? traits->CanUseStderr() : false;
 
     if ( !(m_flags & wxMSGOUT_PREFER_MSGBOX) )

src/common/platinfo.cpp

@@ -174,7 +174,7 @@ void wxPlatformInfo::InitForCurrentPlatform()
     m_initializedForCurrentPlatform = true;
 
     // autodetect all informations
-    const wxAppTraits * const traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
+    const wxAppTraits * const traits = wxApp::GetTraitsIfExists();
     if ( !traits )
     {
         wxFAIL_MSG( wxT("failed to initialize wxPlatformInfo") );

src/common/rendcmn.cpp

@@ -65,8 +65,7 @@ private:
 
     void DoInit()
     {
-        wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
+        if ( wxAppTraits *traits = wxApp::GetTraitsIfExists() )
-        if ( traits )
         {
             // ask the traits object to create a renderer for us
             reset(traits->CreateRenderer());

src/common/stdpbase.cpp

@@ -55,7 +55,7 @@ static wxStandardPathsDefault gs_stdPaths;
 /* static */
 wxStandardPaths& wxStandardPathsBase::Get()
 {
-    wxAppTraits * const traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
+    wxAppTraits * const traits = wxApp::GetTraitsIfExists();
     wxCHECK_MSG( traits, gs_stdPaths, wxT("create wxApp before calling this") );
 
     return traits->GetStandardPaths();

src/common/timercmn.cpp

@@ -54,7 +54,7 @@ wxTimer::~wxTimer()
 
 void wxTimer::Init()
 {
-    wxAppTraits * const traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
+    wxAppTraits * const traits = wxApp::GetTraitsIfExists();
     m_impl = traits ? traits->CreateTimerImpl(this) : NULL;
     if ( !m_impl )
     {

src/msw/utilsexc.cpp

@@ -1018,7 +1018,7 @@ long wxExecute(const wxString& cmd, int flags, wxProcess *handler,
         return pi.dwProcessId;
     }
 
-    wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
+    wxAppTraits *traits = wxApp::GetTraitsIfExists();
     wxCHECK_MSG( traits, -1, wxT("no wxAppTraits in wxExecute()?") );
 
     void *cookie = NULL;