Support using GetTextExtent() with empty string to get descent in wxOSX.

[wxWidgets.git] / include / wx / log.h

diff --git a/include/wx/log.h b/include/wx/log.h
index a4840632454c08f472d85ae952b30cff0683b232..e3e1f54adf4c588df38a7c45800dfe5142cd626c 100644 (file)
--- a/include/wx/log.h
+++ b/include/wx/log.h
@@ -1,242 +1,1269 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        log.h
+// Name:        wx/log.h

 // Purpose:     Assorted wxLogXXX functions, and wxLog (sink for logs)
 // Author:      Vadim Zeitlin
 // Modified by:
 // Created:     29/01/98
 // RCS-ID:      $Id$
 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
 // Purpose:     Assorted wxLogXXX functions, and wxLog (sink for logs)
 // Author:      Vadim Zeitlin
 // Modified by:
 // Created:     29/01/98
 // RCS-ID:      $Id$
 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>

-// Licence:     wxWindows license
+// Licence:     wxWindows licence

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

-#ifndef   __LOGH__
-#define   __LOGH__
+#ifndef _WX_LOG_H_
+#define _WX_LOG_H_

 
 

-#ifdef    __GNUG__
-  #pragma interface
-#endif  //GNU C++
+#include "wx/defs.h"
+
+// ----------------------------------------------------------------------------
+// types
+// ----------------------------------------------------------------------------
+
+// NB: this is needed even if wxUSE_LOG == 0
+typedef unsigned long wxLogLevel;
+
+// the trace masks have been superseded by symbolic trace constants, they're
+// for compatibility only and will be removed soon - do NOT use them
+#if WXWIN_COMPATIBILITY_2_8
+    #define wxTraceMemAlloc 0x0001  // trace memory allocation (new/delete)
+    #define wxTraceMessages 0x0002  // trace window messages/X callbacks
+    #define wxTraceResAlloc 0x0004  // trace GDI resource allocation
+    #define wxTraceRefCount 0x0008  // trace various ref counting operations
+
+    #ifdef  __WINDOWS__
+        #define wxTraceOleCalls 0x0100  // OLE interface calls
+    #endif
+
+    typedef unsigned long wxTraceMask;
+#endif // WXWIN_COMPATIBILITY_2_8
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+#include "wx/string.h"
+#include "wx/strvararg.h"
+
+// ----------------------------------------------------------------------------
+// forward declarations
+// ----------------------------------------------------------------------------
+
+class WXDLLIMPEXP_FWD_BASE wxObject;
+
+#if wxUSE_GUI
+    class WXDLLIMPEXP_FWD_CORE wxFrame;
+#endif // wxUSE_GUI
+
+#if wxUSE_LOG
+
+#include "wx/arrstr.h"
+
+#ifndef __WXWINCE__
+    #include <time.h>   // for time_t
+#endif
+
+#include "wx/dynarray.h"
+#include "wx/hashmap.h"
+
+#if wxUSE_THREADS
+    #include "wx/thread.h"
+#endif // wxUSE_THREADS
+
+// wxUSE_LOG_DEBUG enables the debug log messages
+#ifndef wxUSE_LOG_DEBUG
+    #if wxDEBUG_LEVEL
+        #define wxUSE_LOG_DEBUG 1
+    #else // !wxDEBUG_LEVEL
+        #define wxUSE_LOG_DEBUG 0
+    #endif
+#endif
+
+// wxUSE_LOG_TRACE enables the trace messages, they are disabled by default
+#ifndef wxUSE_LOG_TRACE
+    #if wxDEBUG_LEVEL
+        #define wxUSE_LOG_TRACE 1
+    #else // !wxDEBUG_LEVEL
+        #define wxUSE_LOG_TRACE 0
+    #endif
+#endif // wxUSE_LOG_TRACE
+
+// wxLOG_COMPONENT identifies the component which generated the log record and
+// can be #define'd to a user-defined value when compiling the user code to use
+// component-based filtering (see wxLog::SetComponentLevel())
+#ifndef wxLOG_COMPONENT
+    // this is a variable and not a macro in order to allow the user code to
+    // just #define wxLOG_COMPONENT without #undef'ining it first
+    extern WXDLLIMPEXP_DATA_BASE(const char *) wxLOG_COMPONENT;
+
+    #ifdef WXBUILDING
+        #define wxLOG_COMPONENT "wx"
+    #endif
+#endif

 
 // ----------------------------------------------------------------------------
 // constants
 // ----------------------------------------------------------------------------
 
 // different standard log levels (you may also define your own)
 
 // ----------------------------------------------------------------------------
 // constants
 // ----------------------------------------------------------------------------
 
 // different standard log levels (you may also define your own)

-enum
+enum wxLogLevelValues

 {
 {

-  wxLOG_FatalError, // program can't continue, abort immediately
-  wxLOG_Error,      // a serious error, user must be informed about it
-  wxLOG_Warning,    // user is normally informed about it but may be ignored
-  wxLOG_Message,    // normal message (i.e. normal output of a non GUI app)
-  wxLOG_Info,       // informational message (a.k.a. 'Verbose')
-  wxLOG_Status,     // informational: might go to the status line of GUI app
-  wxLOG_Debug,      // never shown to the user, disabled in release mode
-  wxLOG_Trace,      // trace messages are also only enabled in debug mode
-  wxLOG_Progress,   // used for progress indicator (not yet)
-  wxLOG_User = 100  // user defined levels start here
+    wxLOG_FatalError, // program can't continue, abort immediately
+    wxLOG_Error,      // a serious error, user must be informed about it
+    wxLOG_Warning,    // user is normally informed about it but may be ignored
+    wxLOG_Message,    // normal message (i.e. normal output of a non GUI app)
+    wxLOG_Status,     // informational: might go to the status line of GUI app
+    wxLOG_Info,       // informational message (a.k.a. 'Verbose')
+    wxLOG_Debug,      // never shown to the user, disabled in release mode
+    wxLOG_Trace,      // trace messages are also only enabled in debug mode
+    wxLOG_Progress,   // used for progress indicator (not yet)
+    wxLOG_User = 100, // user defined levels start here
+    wxLOG_Max = 10000

 };
 
 };
 

-// meaning of different bits of the trace mask (which allows selectively
-// enable/disable some trace messages)
-#define wxTraceMemAlloc 0x0001  // trace memory allocation (new/delete)
-#define wxTraceMessages 0x0002  // trace window messages/X callbacks
-#define wxTraceResAlloc 0x0004  // trace GDI resource allocation
-#define wxTraceRefCount 0x0008  // trace various ref counting operations
+// symbolic trace masks - wxLogTrace("foo", "some trace message...") will be
+// discarded unless the string "foo" has been added to the list of allowed
+// ones with AddTraceMask()
+
+#define wxTRACE_MemAlloc wxT("memalloc") // trace memory allocation (new/delete)
+#define wxTRACE_Messages wxT("messages") // trace window messages/X callbacks
+#define wxTRACE_ResAlloc wxT("resalloc") // trace GDI resource allocation
+#define wxTRACE_RefCount wxT("refcount") // trace various ref counting operations

 
 #ifdef  __WINDOWS__
 
 #ifdef  __WINDOWS__

-  #define wxTraceOleCalls 0x0100  // OLE interface calls
+    #define wxTRACE_OleCalls wxT("ole")  // OLE interface calls

 #endif
 
 #endif
 

-typedef unsigned long wxTraceMask;
-typedef unsigned long wxLogLevel;
+#include "wx/iosfwrap.h"
+
+// ----------------------------------------------------------------------------
+// information about a log record, i.e. unit of log output
+// ----------------------------------------------------------------------------
+
+class wxLogRecordInfo
+{
+public:
+    // default ctor creates an uninitialized object
+    wxLogRecordInfo()
+    {
+        memset(this, 0, sizeof(*this));
+    }
+
+    // normal ctor, used by wxLogger specifies the location of the log
+    // statement; its time stamp and thread id are set up here
+    wxLogRecordInfo(const char *filename_,
+                    int line_,
+                    const char *func_,
+                    const char *component_)
+    {
+        filename = filename_;
+        func = func_;
+        line = line_;
+        component = component_;
+
+        timestamp = time(NULL);
+
+#if wxUSE_THREADS
+        threadId = wxThread::GetCurrentId();
+#endif // wxUSE_THREADS
+
+        m_data = NULL;
+    }
+
+    // we need to define copy ctor and assignment operator because of m_data
+    wxLogRecordInfo(const wxLogRecordInfo& other)
+    {
+        Copy(other);
+    }
+
+    wxLogRecordInfo& operator=(const wxLogRecordInfo& other)
+    {
+        if ( &other != this )
+        {
+            delete m_data;
+            Copy(other);
+        }
+
+        return *this;
+    }
+
+    // dtor is non-virtual, this class is not meant to be derived from
+    ~wxLogRecordInfo()
+    {
+        delete m_data;
+    }
+
+
+    // the file name and line number of the file where the log record was
+    // generated, if available or NULL and 0 otherwise
+    const char *filename;
+    int line;
+
+    // the name of the function where the log record was generated (may be NULL
+    // if the compiler doesn't support __FUNCTION__)
+    const char *func;
+
+    // the name of the component which generated this message, may be NULL if
+    // not set (i.e. wxLOG_COMPONENT not defined)
+    const char *component;
+
+    // time of record generation
+    time_t timestamp;
+
+#if wxUSE_THREADS
+    // id of the thread which logged this record
+    wxThreadIdType threadId;
+#endif // wxUSE_THREADS
+
+
+    // store an arbitrary value in this record context
+    //
+    // wxWidgets always uses keys starting with "wx.", e.g. "wx.sys_error"
+    void StoreValue(const wxString& key, wxUIntPtr val)
+    {
+        if ( !m_data )
+            m_data = new ExtraData;
+
+        m_data->numValues[key] = val;
+    }
+
+    void StoreValue(const wxString& key, const wxString& val)
+    {
+        if ( !m_data )
+            m_data = new ExtraData;
+
+        m_data->strValues[key] = val;
+    }
+
+
+    // these functions retrieve the value of either numeric or string key,
+    // return false if not found
+    bool GetNumValue(const wxString& key, wxUIntPtr *val) const
+    {
+        if ( !m_data )
+            return false;
+
+        wxStringToNumHashMap::const_iterator it = m_data->numValues.find(key);
+        if ( it == m_data->numValues.end() )
+            return false;
+
+        *val = it->second;
+
+        return true;
+    }
+
+    bool GetStrValue(const wxString& key, wxString *val) const
+    {
+        if ( !m_data )
+            return false;
+
+        wxStringToStringHashMap::const_iterator it = m_data->strValues.find(key);
+        if ( it == m_data->strValues.end() )
+            return false;
+
+        *val = it->second;
+
+        return true;
+    }
+
+private:
+    void Copy(const wxLogRecordInfo& other)
+    {
+        memcpy(this, &other, sizeof(*this));
+        if ( other.m_data )
+           m_data = new ExtraData(*other.m_data);
+    }
+
+    // extra data associated with the log record: this is completely optional
+    // and can be used to pass information from the log function to the log
+    // sink (e.g. wxLogSysError() uses this to pass the error code)
+    struct ExtraData
+    {
+        wxStringToNumHashMap numValues;
+        wxStringToStringHashMap strValues;
+    };
+
+    // NULL if not used
+    ExtraData *m_data;
+};
+
+#define wxLOG_KEY_TRACE_MASK "wx.trace_mask"
+
+// ----------------------------------------------------------------------------
+// log record: a unit of log output
+// ----------------------------------------------------------------------------
+
+struct wxLogRecord
+{
+    wxLogRecord(wxLogLevel level_,
+                const wxString& msg_,
+                const wxLogRecordInfo& info_)
+        : level(level_),
+          msg(msg_),
+          info(info_)
+    {
+    }
+
+    wxLogLevel level;
+    wxString msg;
+    wxLogRecordInfo info;
+};
+
+// ----------------------------------------------------------------------------
+// Derive from this class to customize format of log messages.
+// ----------------------------------------------------------------------------
+
+class WXDLLIMPEXP_BASE wxLogFormatter
+{
+public:
+    // Default constructor.
+    wxLogFormatter() { }
+
+    // Trivial but virtual destructor for the base class.
+    virtual ~wxLogFormatter() { }
+
+
+    // Override this method to implement custom formatting of the given log
+    // record. The default implementation simply prepends a level-dependent
+    // prefix to the message and optionally adds a time stamp.
+    virtual wxString Format(wxLogLevel level,
+                            const wxString& msg,
+                            const wxLogRecordInfo& info) const;
+
+protected:
+    // Override this method to change just the time stamp formatting. It is
+    // called by default Format() implementation.
+    virtual wxString FormatTime(time_t t) const;
+};
+

 
 // ----------------------------------------------------------------------------
 // derive from this class to redirect (or suppress, or ...) log messages
 // normally, only a single instance of this class exists but it's not enforced
 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------
 // derive from this class to redirect (or suppress, or ...) log messages
 // normally, only a single instance of this class exists but it's not enforced
 // ----------------------------------------------------------------------------

-class WXDLLEXPORT wxLog
+
+class WXDLLIMPEXP_BASE wxLog

 {
 public:
 {
 public:

-  // ctor
-  wxLog();
-
-  // sink function
-  static void OnLog(wxLogLevel level, const char *szString)
-    { if ( ms_pLogger != 0 ) ms_pLogger->DoLog(level, szString); }
-
-  // message buffering
-    // flush shows all messages if they're not logged immediately
-    // (FILE and iostream logs don't need it, but wxGuiLog does to avoid
-    //  showing 17 modal dialogs one after another)
-  virtual void Flush();
-    // call to Flush() may be optimized: call it only if this function 
-    // returns true (although Flush() also returns immediately if there
-    // is no messages, this functions is more efficient because inline)
-  bool HasPendingMessages() const { return m_bHasMessages; }
-
-  // only one sink is active at each moment
-    // get current log target
-  static wxLog *GetActiveTarget();
-    // change log target, pLogger = NULL disables logging,
-    // returns the previous log target
-  static wxLog *SetActiveTarget(wxLog *pLogger);
-
-  // functions controlling the default wxLog behaviour
-    // verbose mode is activated by standard command-line '-verbose' option
-  void SetVerbose(bool bVerbose = TRUE) { m_bVerbose = bVerbose; }
-    // sets the format for timestamp prepended by wxLog::DoLog(): it's
-    // passed to strftime() function, see it's documentation for details.
-    // no time stamp at all if szTF is NULL or empty
-    // NB: the string is not copied, so it's lifetime must be long enough!
-  void SetTimeStampFormat(const char *szTF) { m_szTimeFormat = szTF; }
-    // trace mask (see wxTraceXXX constants for details)
-  void SetTraceMask(wxTraceMask ulMask) { m_ulTraceMask = ulMask; }
-
-  // accessors
-    // gets the verbose status
-  bool GetVerbose() const { return m_bVerbose; }
-    // get current time format
-  const char *GetTimeStampFormat() const { return m_szTimeFormat; }
-    // get trace mask
-  wxTraceMask GetTraceMask() const { return m_ulTraceMask; }
-
-  // make dtor virtual for all derived classes
-  virtual ~wxLog() { }
+    // ctor
+    wxLog() : m_formatter(new wxLogFormatter) { }
+
+    // make dtor virtual for all derived classes
+    virtual ~wxLog();
+
+
+    // log messages selection
+    // ----------------------
+
+    // these functions allow to completely disable all log messages or disable
+    // log messages at level less important than specified for the current
+    // thread
+
+    // is logging enabled at all now?
+    static bool IsEnabled()
+    {
+#if wxUSE_THREADS
+        if ( !wxThread::IsMain() )
+            return IsThreadLoggingEnabled();
+#endif // wxUSE_THREADS
+
+        return ms_doLog;
+    }
+
+    // change the flag state, return the previous one
+    static bool EnableLogging(bool enable = true)
+    {
+#if wxUSE_THREADS
+        if ( !wxThread::IsMain() )
+            return EnableThreadLogging(enable);
+#endif // wxUSE_THREADS
+
+        bool doLogOld = ms_doLog;
+        ms_doLog = enable;
+        return doLogOld;
+    }
+
+    // return the current global log level
+    static wxLogLevel GetLogLevel() { return ms_logLevel; }
+
+    // set global log level: messages with level > logLevel will not be logged
+    static void SetLogLevel(wxLogLevel logLevel) { ms_logLevel = logLevel; }
+
+    // set the log level for the given component
+    static void SetComponentLevel(const wxString& component, wxLogLevel level);
+
+    // return the effective log level for this component, falling back to
+    // parent component and to the default global log level if necessary
+    //
+    // NB: component argument is passed by value and not const reference in an
+    //     attempt to encourage compiler to avoid an extra copy: as we modify
+    //     the component internally, we'd create one anyhow and like this it
+    //     can be avoided if the string is a temporary anyhow
+    static wxLogLevel GetComponentLevel(wxString component);
+
+
+    // is logging of messages from this component enabled at this level?
+    //
+    // usually always called with wxLOG_COMPONENT as second argument
+    static bool IsLevelEnabled(wxLogLevel level, wxString component)
+    {
+        return IsEnabled() && level <= GetComponentLevel(component);
+    }
+
+
+    // enable/disable messages at wxLOG_Verbose level (only relevant if the
+    // current log level is greater or equal to it)
+    //
+    // notice that verbose mode can be activated by the standard command-line
+    // '--verbose' option
+    static void SetVerbose(bool bVerbose = true) { ms_bVerbose = bVerbose; }
+
+    // check if verbose messages are enabled
+    static bool GetVerbose() { return ms_bVerbose; }
+
+
+    // message buffering
+    // -----------------
+
+    // flush shows all messages if they're not logged immediately (FILE
+    // and iostream logs don't need it, but wxLogGui does to avoid showing
+    // 17 modal dialogs one after another)
+    virtual void Flush();
+
+    // flush the active target if any and also output any pending messages from
+    // background threads
+    static void FlushActive();
+
+    // only one sink is active at each moment get current log target, will call
+    // wxAppTraits::CreateLogTarget() to create one if none exists
+    static wxLog *GetActiveTarget();
+
+    // change log target, logger may be NULL
+    static wxLog *SetActiveTarget(wxLog *logger);
+
+#if wxUSE_THREADS
+    // change log target for the current thread only, shouldn't be called from
+    // the main thread as it doesn't use thread-specific log target
+    static wxLog *SetThreadActiveTarget(wxLog *logger);
+#endif // wxUSE_THREADS
+
+    // suspend the message flushing of the main target until the next call
+    // to Resume() - this is mainly for internal use (to prevent wxYield()
+    // from flashing the messages)
+    static void Suspend() { ms_suspendCount++; }
+
+    // must be called for each Suspend()!
+    static void Resume() { ms_suspendCount--; }
+
+    // should GetActiveTarget() try to create a new log object if the
+    // current is NULL?
+    static void DontCreateOnDemand();
+
+    // Make GetActiveTarget() create a new log object again.
+    static void DoCreateOnDemand();
+
+    // log the count of repeating messages instead of logging the messages
+    // multiple times
+    static void SetRepetitionCounting(bool bRepetCounting = true)
+        { ms_bRepetCounting = bRepetCounting; }
+
+    // gets duplicate counting status
+    static bool GetRepetitionCounting() { return ms_bRepetCounting; }
+
+    // add string trace mask
+    static void AddTraceMask(const wxString& str);
+
+    // add string trace mask
+    static void RemoveTraceMask(const wxString& str);
+
+    // remove all string trace masks
+    static void ClearTraceMasks();
+
+    // get string trace masks: note that this is MT-unsafe if other threads can
+    // call AddTraceMask() concurrently
+    static const wxArrayString& GetTraceMasks();
+
+    // is this trace mask in the list?
+    static bool IsAllowedTraceMask(const wxString& mask);
+
+
+    // log formatting
+    // -----------------
+
+    // Change wxLogFormatter object used by wxLog to format the log messages.
+    //
+    // wxLog takes ownership of the pointer passed in but the caller is
+    // responsible for deleting the returned pointer.
+    wxLogFormatter* SetFormatter(wxLogFormatter* formatter);
+
+
+    // All the time stamp related functions below only work when the default
+    // wxLogFormatter is being used. Defining a custom formatter overrides them
+    // as it could use its own time stamp format or format messages without
+    // using time stamp at all.
+
+
+    // sets the time stamp string format: this is used as strftime() format
+    // string for the log targets which add time stamps to the messages; set
+    // it to empty string to disable time stamping completely.
+    static void SetTimestamp(const wxString& ts) { ms_timestamp = ts; }
+
+    // disable time stamping of log messages
+    static void DisableTimestamp() { SetTimestamp(wxEmptyString); }
+
+
+    // get the current timestamp format string (maybe empty)
+    static const wxString& GetTimestamp() { return ms_timestamp; }
+
+
+
+    // helpers: all functions in this section are mostly for internal use only,
+    // don't call them from your code even if they are not formally deprecated
+
+    // put the time stamp into the string if ms_timestamp is not empty (don't
+    // change it otherwise); the first overload uses the current time.
+    static void TimeStamp(wxString *str);
+    static void TimeStamp(wxString *str, time_t t);
+
+    // these methods should only be called from derived classes DoLogRecord(),
+    // DoLogTextAtLevel() and DoLogText() implementations respectively and
+    // shouldn't be called directly, use logging functions instead
+    void LogRecord(wxLogLevel level,
+                   const wxString& msg,
+                   const wxLogRecordInfo& info)
+    {
+        DoLogRecord(level, msg, info);
+    }
+
+    void LogTextAtLevel(wxLogLevel level, const wxString& msg)
+    {
+        DoLogTextAtLevel(level, msg);
+    }
+
+    void LogText(const wxString& msg)
+    {
+        DoLogText(msg);
+    }
+
+    // this is a helper used by wxLogXXX() functions, don't call it directly
+    // and see DoLog() for function to overload in the derived classes
+    static void OnLog(wxLogLevel level,
+                      const wxString& msg,
+                      const wxLogRecordInfo& info);
+
+    // version called when no information about the location of the log record
+    // generation is available (but the time stamp is), it mainly exists for
+    // backwards compatibility, don't use it in new code
+    static void OnLog(wxLogLevel level, const wxString& msg, time_t t);
+
+    // a helper calling the above overload with current time
+    static void OnLog(wxLogLevel level, const wxString& msg)
+    {
+        OnLog(level, msg, time(NULL));
+    }
+
+
+    // this method exists for backwards compatibility only, don't use
+    bool HasPendingMessages() const { return true; }
+
+#if WXWIN_COMPATIBILITY_2_6
+    // this function doesn't do anything any more, don't call it
+    static wxDEPRECATED_INLINE(
+        wxChar *SetLogBuffer(wxChar *, size_t = 0), return NULL;
+    );
+#endif // WXWIN_COMPATIBILITY_2_6
+
+    // don't use integer masks any more, use string trace masks instead
+#if WXWIN_COMPATIBILITY_2_8
+    static wxDEPRECATED_INLINE( void SetTraceMask(wxTraceMask ulMask),
+        ms_ulTraceMask = ulMask; )
+
+    // this one can't be marked deprecated as it's used in our own wxLogger
+    // below but it still is deprecated and shouldn't be used
+    static wxTraceMask GetTraceMask() { return ms_ulTraceMask; }
+#endif // WXWIN_COMPATIBILITY_2_8

 
 protected:
 
 protected:

-  bool m_bHasMessages;
-
-  bool          m_bVerbose;     // FALSE => ignore LogInfo messages
-  const char   *m_szTimeFormat; // format for strftime()
-  wxTraceMask   m_ulTraceMask;  // controls wxLogTrace behaviour
-
-  // the logging functions that can be overriden
-    // default DoLog() prepends the time stamp and a prefix corresponding
-    // to the message to szString and then passes it to DoLogString()
-  virtual void DoLog(wxLogLevel level, const char *szString);
-    // default DoLogString does nothing but is not pure virtual because if
-    // you override DoLog() you might not need it at all
-  virtual void DoLogString(const char *szString);
-  
+    // the logging functions that can be overridden: DoLogRecord() is called
+    // for every "record", i.e. a unit of log output, to be logged and by
+    // default formats the message and passes it to DoLogTextAtLevel() which in
+    // turn passes it to DoLogText() by default
+
+    // override this method if you want to change message formatting or do
+    // dynamic filtering
+    virtual void DoLogRecord(wxLogLevel level,
+                             const wxString& msg,
+                             const wxLogRecordInfo& info);
+
+    // override this method to redirect output to different channels depending
+    // on its level only; if even the level doesn't matter, override
+    // DoLogText() instead
+    virtual void DoLogTextAtLevel(wxLogLevel level, const wxString& msg);
+
+    // this function is not pure virtual as it might not be needed if you do
+    // the logging in overridden DoLogRecord() or DoLogTextAtLevel() directly
+    // but if you do not override them in your derived class you must override
+    // this one as the default implementation of it simply asserts
+    virtual void DoLogText(const wxString& msg);
+
+
+    // the rest of the functions are for backwards compatibility only, don't
+    // use them in new code; if you're updating your existing code you need to
+    // switch to overriding DoLogRecord/Text() above (although as long as these
+    // functions exist, log classes using them will continue to work)
+#if WXWIN_COMPATIBILITY_2_8
+    wxDEPRECATED_BUT_USED_INTERNALLY(
+        virtual void DoLog(wxLogLevel level, const char *szString, time_t t)
+    );
+
+    wxDEPRECATED_BUT_USED_INTERNALLY(
+        virtual void DoLog(wxLogLevel level, const wchar_t *wzString, time_t t)
+    );
+
+    // these shouldn't be used by new code
+    wxDEPRECATED_BUT_USED_INTERNALLY_INLINE(
+        virtual void DoLogString(const char *WXUNUSED(szString),
+                                 time_t WXUNUSED(t)),
+        wxEMPTY_PARAMETER_VALUE
+    )
+
+    wxDEPRECATED_BUT_USED_INTERNALLY_INLINE(
+        virtual void DoLogString(const wchar_t *WXUNUSED(wzString),
+                                 time_t WXUNUSED(t)),
+        wxEMPTY_PARAMETER_VALUE
+    )
+#endif // WXWIN_COMPATIBILITY_2_8
+
+
+    // log a message indicating the number of times the previous message was
+    // repeated if previous repetition counter is strictly positive, does
+    // nothing otherwise; return the old value of repetition counter
+    unsigned LogLastRepeatIfNeeded();
+

 private:
 private:

-  // static variables
-  // ----------------
-  static wxLog *ms_pLogger;       // currently active log sink
-  static bool   ms_bInitialized;  // any log targets created?
+#if wxUSE_THREADS
+    // called from FlushActive() to really log any buffered messages logged
+    // from the other threads
+    void FlushThreadMessages();
+
+    // these functions are called for non-main thread only by IsEnabled() and
+    // EnableLogging() respectively
+    static bool IsThreadLoggingEnabled();
+    static bool EnableThreadLogging(bool enable = true);
+#endif // wxUSE_THREADS
+
+    // get the active log target for the main thread, auto-creating it if
+    // necessary
+    //
+    // this is called from GetActiveTarget() and OnLog() when they're called
+    // from the main thread
+    static wxLog *GetMainThreadActiveTarget();
+
+    // called from OnLog() if it's called from the main thread or if we have a
+    // (presumably MT-safe) thread-specific logger and by FlushThreadMessages()
+    // when it plays back the buffered messages logged from the other threads
+    void CallDoLogNow(wxLogLevel level,
+                      const wxString& msg,
+                      const wxLogRecordInfo& info);
+
+
+    // variables
+    // ----------------
+
+    wxLogFormatter    *m_formatter; // We own this pointer.
+
+
+    // static variables
+    // ----------------
+
+    // if true, don't log the same message multiple times, only log it once
+    // with the number of times it was repeated
+    static bool        ms_bRepetCounting;
+
+    static wxLog      *ms_pLogger;      // currently active log sink
+    static bool        ms_doLog;        // false => all logging disabled
+    static bool        ms_bAutoCreate;  // create new log targets on demand?
+    static bool        ms_bVerbose;     // false => ignore LogInfo messages
+
+    static wxLogLevel  ms_logLevel;     // limit logging to levels <= ms_logLevel
+
+    static size_t      ms_suspendCount; // if positive, logs are not flushed
+
+    // format string for strftime(), if empty, time stamping log messages is
+    // disabled
+    static wxString    ms_timestamp;
+
+#if WXWIN_COMPATIBILITY_2_8
+    static wxTraceMask ms_ulTraceMask;   // controls wxLogTrace behaviour
+#endif // WXWIN_COMPATIBILITY_2_8

 };
 
 // ----------------------------------------------------------------------------
 // "trivial" derivations of wxLog
 // ----------------------------------------------------------------------------
 
 };
 
 // ----------------------------------------------------------------------------
 // "trivial" derivations of wxLog
 // ----------------------------------------------------------------------------
 

-// log everything to a "FILE *", stderr by default
-class WXDLLEXPORT wxLogStderr : public wxLog
+// log everything except for the debug/trace messages (which are passed to
+// wxMessageOutputDebug) to a buffer
+class WXDLLIMPEXP_BASE wxLogBuffer : public wxLog

 {
 public:
 {
 public:

-  // redirect log output to a FILE
-  wxLogStderr(FILE *fp = NULL);
+    wxLogBuffer() { }
+
+    // get the string contents with all messages logged
+    const wxString& GetBuffer() const { return m_str; }
+
+    // show the buffer contents to the user in the best possible way (this uses
+    // wxMessageOutputMessageBox) and clear it
+    virtual void Flush();
+
+protected:
+    virtual void DoLogTextAtLevel(wxLogLevel level, const wxString& msg);

 
 private:
 
 private:

-  // implement sink function
-  virtual void DoLogString(const char *szString);
+    wxString m_str;

 
 

-  FILE *m_fp;
+    wxDECLARE_NO_COPY_CLASS(wxLogBuffer);

 };
 
 };
 

+
+// log everything to a "FILE *", stderr by default
+class WXDLLIMPEXP_BASE wxLogStderr : public wxLog
+{
+public:
+    // redirect log output to a FILE
+    wxLogStderr(FILE *fp = NULL);
+
+protected:
+    // implement sink function
+    virtual void DoLogText(const wxString& msg);
+
+    FILE *m_fp;
+
+    wxDECLARE_NO_COPY_CLASS(wxLogStderr);
+};
+
+#if wxUSE_STD_IOSTREAM
+

 // log everything to an "ostream", cerr by default
 // log everything to an "ostream", cerr by default

-class WXDLLEXPORT wxLogStream : public wxLog
+class WXDLLIMPEXP_BASE wxLogStream : public wxLog

 {
 public:
 {
 public:

-  // redirect log output to an ostream
-  wxLogStream(ostream *ostr = NULL);
+    // redirect log output to an ostream
+    wxLogStream(wxSTD ostream *ostr = (wxSTD ostream *) NULL);

 
 protected:
 
 protected:

-  // implement sink function
-  virtual void DoLogString(const char *szString);
+    // implement sink function
+    virtual void DoLogText(const wxString& msg);

 
 

-  // @@ using ptr here to avoid including <iostream.h> from this file
-  ostream *m_ostr;
+    // using ptr here to avoid including <iostream.h> from this file
+    wxSTD ostream *m_ostr;

 };
 
 };
 

-// log everything to a text window (GUI only of course)
-class wxTextCtrl;
-class WXDLLEXPORT wxLogTextCtrl : public wxLogStream
+#endif // wxUSE_STD_IOSTREAM
+
+// ----------------------------------------------------------------------------
+// /dev/null log target: suppress logging until this object goes out of scope
+// ----------------------------------------------------------------------------
+
+// example of usage:
+/*
+    void Foo()
+    {
+        wxFile file;
+
+        // wxFile.Open() normally complains if file can't be opened, we don't
+        // want it
+        wxLogNull logNo;
+
+        if ( !file.Open("bar") )
+            ... process error ourselves ...
+
+        // ~wxLogNull called, old log sink restored
+    }
+ */
+class WXDLLIMPEXP_BASE wxLogNull

 {
 public:
 {
 public:

-  // we just create an ostream from wxTextCtrl and use it in base class
-  wxLogTextCtrl(wxTextCtrl *pTextCtrl);
- ~wxLogTextCtrl();
+    wxLogNull() : m_flagOld(wxLog::EnableLogging(false)) { }
+    ~wxLogNull() { (void)wxLog::EnableLogging(m_flagOld); }
+
+private:
+    bool m_flagOld; // the previous value of the wxLog::ms_doLog

 };
 
 // ----------------------------------------------------------------------------
 };
 
 // ----------------------------------------------------------------------------

-// GUI log target, the default one for wxWindows programs
+// chaining log target: installs itself as a log target and passes all
+// messages to the real log target given to it in the ctor but also forwards
+// them to the previously active one
+//
+// note that you don't have to call SetActiveTarget() with this class, it
+// does it itself in its ctor

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

-class WXDLLEXPORT wxLogGui : public wxLog
+
+class WXDLLIMPEXP_BASE wxLogChain : public wxLog

 {
 public:
 {
 public:

-  // ctor
-  wxLogGui();
+    wxLogChain(wxLog *logger);
+    virtual ~wxLogChain();
+
+    // change the new log target
+    void SetLog(wxLog *logger);

 
 

-  // show all messages that were logged since the last Flush()
-  virtual void Flush();
+    // this can be used to temporarily disable (and then reenable) passing
+    // messages to the old logger (by default we do pass them)
+    void PassMessages(bool bDoPass) { m_bPassMessages = bDoPass; }
+
+    // are we passing the messages to the previous log target?
+    bool IsPassingMessages() const { return m_bPassMessages; }
+
+    // return the previous log target (may be NULL)
+    wxLog *GetOldLog() const { return m_logOld; }
+
+    // override base class version to flush the old logger as well
+    virtual void Flush();
+
+    // call to avoid destroying the old log target
+    void DetachOldLog() { m_logOld = NULL; }

 
 protected:
 
 protected:

-  virtual void DoLog(wxLogLevel level, const char *szString);
+    // pass the record to the old logger if needed
+    virtual void DoLogRecord(wxLogLevel level,
+                             const wxString& msg,
+                             const wxLogRecordInfo& info);
+
+private:
+    // the current log target
+    wxLog *m_logNew;
+
+    // the previous log target
+    wxLog *m_logOld;
+
+    // do we pass the messages to the old logger?
+    bool m_bPassMessages;

 
 

-  wxArrayString m_aMessages;
-  bool          m_bErrors;
+    wxDECLARE_NO_COPY_CLASS(wxLogChain);

 };
 
 };
 

-// ----------------------------------------------------------------------------
-// (background) log window: this class forwards all log messages to the log
-// target which was active when it was instantiated, but also collects them
-// to the log window. This window has it's own menu which allows the user to
-// close it, clear the log contents or save it to the file.
-// ----------------------------------------------------------------------------
-class wxLogFrame;
-class WXDLLEXPORT wxLogWindow : public wxLog
+// a chain log target which uses itself as the new logger
+
+#define wxLogPassThrough wxLogInterposer
+
+class WXDLLIMPEXP_BASE wxLogInterposer : public wxLogChain

 {
 public:
 {
 public:

-  wxLogWindow(const wxTString& strTitle);
-  ~wxLogWindow();
-  
-  // show/hide the log window
-  void Show(bool bShow = TRUE);
+    wxLogInterposer();

 
 

-protected:
-  virtual void DoLog(wxLogLevel level, const char *szString);
-  virtual void DoLogString(const char *szString);
-  

 private:
 private:

-  wxLog      *m_pOldLog;    // previous log target
-  wxLogFrame *m_pLogFrame;  // the log frame
+    wxDECLARE_NO_COPY_CLASS(wxLogInterposer);

 };
 
 };
 

+// a temporary interposer which doesn't destroy the old log target
+// (calls DetachOldLog)
+
+class WXDLLIMPEXP_BASE wxLogInterposerTemp : public wxLogChain
+{
+public:
+    wxLogInterposerTemp();
+
+private:
+    wxDECLARE_NO_COPY_CLASS(wxLogInterposerTemp);
+};
+
+#if wxUSE_GUI
+    // include GUI log targets:
+    #include "wx/generic/logg.h"
+#endif // wxUSE_GUI
+

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

-// /dev/null log target: suppress logging until this object goes out of scope
+// wxLogger

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

-// example of usage:
-/*
-void Foo() {
-  wxFile file;
-
-  // wxFile.Open() normally complains if file can't be opened, we don't want it
-  wxLogNull logNo;
-  if ( !file.Open("bar") )
-    ... process error ourselves ...
-
-  // ~wxLogNull called, old log sink restored
-}
-*/
-class WXDLLEXPORT wxLogNull
+// wxLogger is a helper class used by wxLogXXX() functions implementation,
+// don't use it directly as it's experimental and subject to change (OTOH it
+// might become public in the future if it's deemed to be useful enough)
+
+// contains information about the context from which a log message originates
+// and provides Log() vararg method which forwards to wxLog::OnLog() and passes
+// this context to it
+class wxLogger

 {
 public:
 {
 public:

-  // ctor saves old log target, dtor restores it
-  wxLogNull() { m_pPrevLogger = wxLog::SetActiveTarget(NULL); }
- ~wxLogNull() { (void)wxLog::SetActiveTarget(m_pPrevLogger);  }
+    // ctor takes the basic information about the log record
+    wxLogger(wxLogLevel level,
+             const char *filename,
+             int line,
+             const char *func,
+             const char *component)
+        : m_level(level),
+          m_info(filename, line, func, component)
+    {
+    }
+
+    // store extra data in our log record and return this object itself (so
+    // that further calls to its functions could be chained)
+    template <typename T>
+    wxLogger& Store(const wxString& key, T val)
+    {
+        m_info.StoreValue(key, val);
+        return *this;
+    }
+
+    // hack for "overloaded" wxLogXXX() functions: calling this method
+    // indicates that we may have an extra first argument preceding the format
+    // string and that if we do have it, we should store it in m_info using the
+    // given key (while by default 0 value will be used)
+    wxLogger& MaybeStore(const wxString& key, wxUIntPtr value = 0)
+    {
+        wxASSERT_MSG( m_optKey.empty(), "can only have one optional value" );
+        m_optKey = key;
+
+        m_info.StoreValue(key, value);
+        return *this;
+    }
+
+
+    // non-vararg function used by wxVLogXXX():
+
+    // log the message at the level specified in the ctor if this log message
+    // is enabled
+    void LogV(const wxString& format, va_list argptr)
+    {
+        // remember that fatal errors can't be disabled
+        if ( m_level == wxLOG_FatalError ||
+                wxLog::IsLevelEnabled(m_level, m_info.component) )
+            DoCallOnLog(format, argptr);
+    }
+
+    // overloads used by functions with optional leading arguments (whose
+    // values are stored in the key passed to MaybeStore())
+    void LogV(long num, const wxString& format, va_list argptr)
+    {
+        Store(m_optKey, num);
+
+        LogV(format, argptr);
+    }
+
+    void LogV(void *ptr, const wxString& format, va_list argptr)
+    {
+        Store(m_optKey, wxPtrToUInt(ptr));
+
+        LogV(format, argptr);
+    }
+
+    void LogVTrace(const wxString& mask, const wxString& format, va_list argptr)
+    {
+        if ( !wxLog::IsAllowedTraceMask(mask) )
+            return;
+
+        Store(wxLOG_KEY_TRACE_MASK, mask);
+
+        LogV(format, argptr);
+    }
+
+
+    // vararg functions used by wxLogXXX():
+
+    // will log the message at the level specified in the ctor
+    //
+    // notice that this function supposes that the caller already checked that
+    // the level was enabled and does no checks itself
+    WX_DEFINE_VARARG_FUNC_VOID
+    (
+        Log,
+        1, (const wxFormatString&),
+        DoLog, DoLogUtf8
+    )
+
+    // same as Log() but with an extra numeric or pointer parameters: this is
+    // used to pass an optional value by storing it in m_info under the name
+    // passed to MaybeStore() and is required to support "overloaded" versions
+    // of wxLogStatus() and wxLogSysError()
+    WX_DEFINE_VARARG_FUNC_VOID
+    (
+        Log,
+        2, (long, const wxFormatString&),
+        DoLogWithNum, DoLogWithNumUtf8
+    )
+
+    // unfortunately we can't use "void *" here as we get overload ambiguities
+    // with Log(wxFormatString, ...) when the first argument is a "char *" or
+    // "wchar_t *" then -- so we only allow passing wxObject here, which is
+    // ugly but fine in practice as this overload is only used by wxLogStatus()
+    // whose first argument is a wxFrame
+    WX_DEFINE_VARARG_FUNC_VOID
+    (
+        Log,
+        2, (wxObject *, const wxFormatString&),
+        DoLogWithPtr, DoLogWithPtrUtf8
+    )
+
+    // log the message at the level specified as its first argument
+    //
+    // as the macros don't have access to the level argument in this case, this
+    // function does check that the level is enabled itself
+    WX_DEFINE_VARARG_FUNC_VOID
+    (
+        LogAtLevel,
+        2, (wxLogLevel, const wxFormatString&),
+        DoLogAtLevel, DoLogAtLevelUtf8
+    )
+
+    // special versions for wxLogTrace() which is passed either string or
+    // integer mask as first argument determining whether the message should be
+    // logged or not
+    WX_DEFINE_VARARG_FUNC_VOID
+    (
+        LogTrace,
+        2, (const wxString&, const wxFormatString&),
+        DoLogTrace, DoLogTraceUtf8
+    )
+
+#if WXWIN_COMPATIBILITY_2_8
+    WX_DEFINE_VARARG_FUNC_VOID
+    (
+        LogTrace,
+        2, (wxTraceMask, const wxFormatString&),
+        DoLogTraceMask, DoLogTraceMaskUtf8
+    )
+#endif // WXWIN_COMPATIBILITY_2_8
+
+#ifdef __WATCOMC__
+    // workaround for http://bugzilla.openwatcom.org/show_bug.cgi?id=351
+    WX_VARARG_WATCOM_WORKAROUND(void, Log,
+                               1, (const wxString&),
+                               (wxFormatString(f1)))
+    WX_VARARG_WATCOM_WORKAROUND(void, Log,
+                               1, (const wxCStrData&),
+                               (wxFormatString(f1)))
+    WX_VARARG_WATCOM_WORKAROUND(void, Log,
+                               1, (const char*),
+                               (wxFormatString(f1)))
+    WX_VARARG_WATCOM_WORKAROUND(void, Log,
+                               1, (const wchar_t*),
+                               (wxFormatString(f1)))
+
+    WX_VARARG_WATCOM_WORKAROUND(void, Log,
+                               2, (long, const wxString&),
+                               (f1, wxFormatString(f2)))
+    WX_VARARG_WATCOM_WORKAROUND(void, Log,
+                               2, (long, const wxCStrData&),
+                               (f1, wxFormatString(f2)))
+    WX_VARARG_WATCOM_WORKAROUND(void, Log,
+                               2, (long, const char *),
+                               (f1, wxFormatString(f2)))
+    WX_VARARG_WATCOM_WORKAROUND(void, Log,
+                               2, (long, const wchar_t *),
+                               (f1, wxFormatString(f2)))
+
+    WX_VARARG_WATCOM_WORKAROUND(void, Log,
+                               2, (wxObject *, const wxString&),
+                               (f1, wxFormatString(f2)))
+    WX_VARARG_WATCOM_WORKAROUND(void, Log,
+                               2, (wxObject *, const wxCStrData&),
+                               (f1, wxFormatString(f2)))
+    WX_VARARG_WATCOM_WORKAROUND(void, Log,
+                               2, (wxObject *, const char *),
+                               (f1, wxFormatString(f2)))
+    WX_VARARG_WATCOM_WORKAROUND(void, Log,
+                               2, (wxObject *, const wchar_t *),
+                               (f1, wxFormatString(f2)))
+
+    WX_VARARG_WATCOM_WORKAROUND(void, LogAtLevel,
+                               2, (wxLogLevel, const wxString&),
+                               (f1, wxFormatString(f2)))
+    WX_VARARG_WATCOM_WORKAROUND(void, LogAtLevel,
+                               2, (wxLogLevel, const wxCStrData&),
+                               (f1, wxFormatString(f2)))
+    WX_VARARG_WATCOM_WORKAROUND(void, LogAtLevel,
+                               2, (wxLogLevel, const char *),
+                               (f1, wxFormatString(f2)))
+    WX_VARARG_WATCOM_WORKAROUND(void, LogAtLevel,
+                               2, (wxLogLevel, const wchar_t *),
+                               (f1, wxFormatString(f2)))
+
+    WX_VARARG_WATCOM_WORKAROUND(void, LogTrace,
+                               2, (const wxString&, const wxString&),
+                               (f1, wxFormatString(f2)))
+    WX_VARARG_WATCOM_WORKAROUND(void, LogTrace,
+                               2, (const wxString&, const wxCStrData&),
+                               (f1, wxFormatString(f2)))
+    WX_VARARG_WATCOM_WORKAROUND(void, LogTrace,
+                               2, (const wxString&, const char *),
+                               (f1, wxFormatString(f2)))
+    WX_VARARG_WATCOM_WORKAROUND(void, LogTrace,
+                               2, (const wxString&, const wchar_t *),
+                               (f1, wxFormatString(f2)))
+
+#if WXWIN_COMPATIBILITY_2_8
+    WX_VARARG_WATCOM_WORKAROUND(void, LogTrace,
+                               2, (wxTraceMask, wxTraceMask),
+                               (f1, wxFormatString(f2)))
+    WX_VARARG_WATCOM_WORKAROUND(void, LogTrace,
+                               2, (wxTraceMask, const wxCStrData&),
+                               (f1, wxFormatString(f2)))
+    WX_VARARG_WATCOM_WORKAROUND(void, LogTrace,
+                               2, (wxTraceMask, const char *),
+                               (f1, wxFormatString(f2)))
+    WX_VARARG_WATCOM_WORKAROUND(void, LogTrace,
+                               2, (wxTraceMask, const wchar_t *),
+                               (f1, wxFormatString(f2)))
+#endif // WXWIN_COMPATIBILITY_2_8
+#endif // __WATCOMC__

 
 private:
 
 private:

-  wxLog *m_pPrevLogger; // old log target
+#if !wxUSE_UTF8_LOCALE_ONLY
+    void DoLog(const wxChar *format, ...)
+    {
+        va_list argptr;
+        va_start(argptr, format);
+        DoCallOnLog(format, argptr);
+        va_end(argptr);
+    }
+
+    void DoLogWithNum(long num, const wxChar *format, ...)
+    {
+        Store(m_optKey, num);
+
+        va_list argptr;
+        va_start(argptr, format);
+        DoCallOnLog(format, argptr);
+        va_end(argptr);
+    }
+
+    void DoLogWithPtr(void *ptr, const wxChar *format, ...)
+    {
+        Store(m_optKey, wxPtrToUInt(ptr));
+
+        va_list argptr;
+        va_start(argptr, format);
+        DoCallOnLog(format, argptr);
+        va_end(argptr);
+    }
+
+    void DoLogAtLevel(wxLogLevel level, const wxChar *format, ...)
+    {
+        if ( !wxLog::IsLevelEnabled(level, m_info.component) )
+            return;
+
+        va_list argptr;
+        va_start(argptr, format);
+        DoCallOnLog(level, format, argptr);
+        va_end(argptr);
+    }
+
+    void DoLogTrace(const wxString& mask, const wxChar *format, ...)
+    {
+        if ( !wxLog::IsAllowedTraceMask(mask) )
+            return;
+
+        Store(wxLOG_KEY_TRACE_MASK, mask);
+
+        va_list argptr;
+        va_start(argptr, format);
+        DoCallOnLog(format, argptr);
+        va_end(argptr);
+    }
+
+#if WXWIN_COMPATIBILITY_2_8
+    void DoLogTraceMask(wxTraceMask mask, const wxChar *format, ...)
+    {
+        if ( (wxLog::GetTraceMask() & mask) != mask )
+            return;
+
+        Store(wxLOG_KEY_TRACE_MASK, mask);
+
+        va_list argptr;
+        va_start(argptr, format);
+        DoCallOnLog(format, argptr);
+        va_end(argptr);
+    }
+#endif // WXWIN_COMPATIBILITY_2_8
+#endif // !wxUSE_UTF8_LOCALE_ONLY
+
+#if wxUSE_UNICODE_UTF8
+    void DoLogUtf8(const char *format, ...)
+    {
+        va_list argptr;
+        va_start(argptr, format);
+        DoCallOnLog(format, argptr);
+        va_end(argptr);
+    }
+
+    void DoLogWithNumUtf8(long num, const char *format, ...)
+    {
+        Store(m_optKey, num);
+
+        va_list argptr;
+        va_start(argptr, format);
+        DoCallOnLog(format, argptr);
+        va_end(argptr);
+    }
+
+    void DoLogWithPtrUtf8(void *ptr, const char *format, ...)
+    {
+        Store(m_optKey, wxPtrToUInt(ptr));
+
+        va_list argptr;
+        va_start(argptr, format);
+        DoCallOnLog(format, argptr);
+        va_end(argptr);
+    }
+
+    void DoLogAtLevelUtf8(wxLogLevel level, const char *format, ...)
+    {
+        if ( !wxLog::IsLevelEnabled(level, m_info.component) )
+            return;
+
+        va_list argptr;
+        va_start(argptr, format);
+        DoCallOnLog(level, format, argptr);
+        va_end(argptr);
+    }
+
+    void DoLogTraceUtf8(const wxString& mask, const char *format, ...)
+    {
+        if ( !wxLog::IsAllowedTraceMask(mask) )
+            return;
+
+        Store(wxLOG_KEY_TRACE_MASK, mask);
+
+        va_list argptr;
+        va_start(argptr, format);
+        DoCallOnLog(format, argptr);
+        va_end(argptr);
+    }
+
+#if WXWIN_COMPATIBILITY_2_8
+    void DoLogTraceMaskUtf8(wxTraceMask mask, const char *format, ...)
+    {
+        if ( (wxLog::GetTraceMask() & mask) != mask )
+            return;
+
+        Store(wxLOG_KEY_TRACE_MASK, mask);
+
+        va_list argptr;
+        va_start(argptr, format);
+        DoCallOnLog(format, argptr);
+        va_end(argptr);
+    }
+#endif // WXWIN_COMPATIBILITY_2_8
+#endif // wxUSE_UNICODE_UTF8
+
+    void DoCallOnLog(wxLogLevel level, const wxString& format, va_list argptr)
+    {
+        wxLog::OnLog(level, wxString::FormatV(format, argptr), m_info);
+    }
+
+    void DoCallOnLog(const wxString& format, va_list argptr)
+    {
+        DoCallOnLog(m_level, format, argptr);
+    }
+
+
+    const wxLogLevel m_level;
+    wxLogRecordInfo m_info;
+
+    wxString m_optKey;
+
+    wxDECLARE_NO_COPY_CLASS(wxLogger);

 };
 
 // ============================================================================
 };
 
 // ============================================================================


@@ -244,89 +1271,363 @@ private:
 // ============================================================================
 
 // ----------------------------------------------------------------------------
 // ============================================================================
 
 // ----------------------------------------------------------------------------

-// Log functions should be used by application instead of stdio, iostream &c
-// for log messages for easy redirection
+// get error code/error message from system in a portable way

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

-// define wxLog<level>
-// -------------------
-
-// NB: all these functions take `wxTString' and not
-//     `const wxTString&' because according to C++ standard
-//     the first argument to a vararg function can not be
-//     an array, function or reference :-(
-
-// the most generic log function
-void WXDLLEXPORT wxLogGeneric(wxLogLevel level, wxTString strFormat, ...);
-
-#define DECLARE_LOG_FUNCTION(level)                                 \
-        extern void WXDLLEXPORT wxLog##level(wxTString strFormat, ...)
-
-// one function per each level
-DECLARE_LOG_FUNCTION(FatalError);
-DECLARE_LOG_FUNCTION(Error);
-DECLARE_LOG_FUNCTION(Warning);
-DECLARE_LOG_FUNCTION(Message);
-DECLARE_LOG_FUNCTION(Info);
-DECLARE_LOG_FUNCTION(Status);
-DECLARE_LOG_FUNCTION(Verbose);
-
-// additional one: as wxLogError, but also logs last system call error code
-// and the corresponding error message if available
-DECLARE_LOG_FUNCTION(SysError);
-
-// and another one which also takes the error code (for those broken APIs
-// that don't set the errno (like registry APIs in Win32))
-void WXDLLEXPORT wxLogSysError(long lErrCode, wxTString strFormat, ...);
-
-// debug functions do nothing in release mode
-#ifdef  __DEBUG__
-  // NB: debug functions don't translate their arguments
-  extern void WXDLLEXPORT wxLogDebug(const char *szFormat, ...);
-
-  // first king of LogTrace is uncoditional: it doesn't check the level,
-  // while the second one does nothing if all of level bits are not set
-  // in wxLog::GetActive()->GetTraceMask().
-  extern void WXDLLEXPORT wxLogTrace(const char *szFormat, ...);
-  extern void WXDLLEXPORT wxLogTrace(wxTraceMask mask,
-                                     const char *szFormat, ...);
-#else   //!debug
-  #define wxLogDebug
-  #define wxLogTrace
+// return the last system error code
+WXDLLIMPEXP_BASE unsigned long wxSysErrorCode();
+
+// return the error message for given (or last if 0) error code
+WXDLLIMPEXP_BASE const wxChar* wxSysErrorMsg(unsigned long nErrCode = 0);
+
+// ----------------------------------------------------------------------------
+// define wxLog<level>() functions which can be used by application instead of
+// stdio, iostream &c for log messages for easy redirection
+// ----------------------------------------------------------------------------
+
+/*
+    The code below is unreadable because it (unfortunately unavoidably)
+    contains a lot of macro magic but all it does is to define wxLogXXX() such
+    that you can call them as vararg functions to log a message at the
+    corresponding level.
+
+    More precisely, it defines:
+
+        - wxLog{FatalError,Error,Warning,Message,Verbose,Debug}() functions
+        taking the format string and additional vararg arguments if needed.
+        - wxLogGeneric(wxLogLevel level, const wxString& format, ...) which
+        takes the log level explicitly.
+        - wxLogSysError(const wxString& format, ...) and wxLogSysError(long
+        err, const wxString& format, ...) which log a wxLOG_Error severity
+        message with the error message corresponding to the system error code
+        err or the last error.
+        - wxLogStatus(const wxString& format, ...) which logs the message into
+        the status bar of the main application window and its overload
+        wxLogStatus(wxFrame *frame, const wxString& format, ...) which logs it
+        into the status bar of the specified frame.
+        - wxLogTrace(Mask mask, const wxString& format, ...) which only logs
+        the message is the specified mask is enabled. This comes in two kinds:
+        Mask can be a wxString or a long. Both are deprecated.
+
+    In addition, wxVLogXXX() versions of all the functions above are also
+    defined. They take a va_list argument instead of "...".
+ */
+
+// creates wxLogger object for the current location
+#define wxMAKE_LOGGER(level) \
+    wxLogger(wxLOG_##level, __FILE__, __LINE__, __WXFUNCTION__, wxLOG_COMPONENT)
+
+// this macro generates the expression which logs whatever follows it in
+// parentheses at the level specified as argument
+#define wxDO_LOG(level) wxMAKE_LOGGER(level).Log
+
+// this is the non-vararg equivalent
+#define wxDO_LOGV(level, format, argptr) \
+    wxMAKE_LOGGER(level).LogV(format, argptr)
+
+// this macro declares wxLog<level>() macro which logs whatever follows it if
+// logging at specified level is enabled (notice that if it is false, the
+// following arguments are not even evaluated which is good as it avoids
+// unnecessary overhead)
+//
+// Note: the strange if/else construct is needed to make the following code
+//
+//          if ( cond )
+//              wxLogError("!!!");
+//          else
+//              ...
+//
+//       work as expected, without it the second "else" would match the "if"
+//       inside wxLogError(). Unfortunately code like
+//
+//          if ( cond )
+//              wxLogError("!!!");
+//
+//       now provokes "suggest explicit braces to avoid ambiguous 'else'"
+//       warnings from g++ 4.3 and later with -Wparentheses on but they can be
+//       easily fixed by adding curly braces around wxLogError() and at least
+//       the code still does do the right thing.
+#define wxDO_LOG_IF_ENABLED(level)                                            \
+    if ( !wxLog::IsLevelEnabled(wxLOG_##level, wxLOG_COMPONENT) )             \
+    {}                                                                        \
+    else                                                                      \
+        wxDO_LOG(level)
+
+// wxLogFatalError() is special as it can't be disabled
+#define wxLogFatalError wxDO_LOG(FatalError)
+#define wxVLogFatalError(format, argptr) wxDO_LOGV(FatalError, format, argptr)
+
+#define wxLogError wxDO_LOG_IF_ENABLED(Error)
+#define wxVLogError(format, argptr) wxDO_LOGV(Error, format, argptr)
+
+#define wxLogWarning wxDO_LOG_IF_ENABLED(Warning)
+#define wxVLogWarning(format, argptr) wxDO_LOGV(Warning, format, argptr)
+
+#define wxLogMessage wxDO_LOG_IF_ENABLED(Message)
+#define wxVLogMessage(format, argptr) wxDO_LOGV(Message, format, argptr)
+
+// this one is special as it only logs if we're in verbose mode
+#define wxLogVerbose                                                          \
+    if ( !(wxLog::IsLevelEnabled(wxLOG_Info, wxLOG_COMPONENT) &&              \
+            wxLog::GetVerbose()) )                                            \
+    {}                                                                        \
+    else                                                                      \
+        wxDO_LOG(Info)
+#define wxVLogVerbose(format, argptr)                                         \
+    if ( !(wxLog::IsLevelEnabled(wxLOG_Info, wxLOG_COMPONENT) &&              \
+            wxLog::GetVerbose()) )                                            \
+    {}                                                                        \
+    else                                                                      \
+        wxDO_LOGV(Info, format, argptr)
+
+// deprecated synonyms for wxLogVerbose() and wxVLogVerbose()
+#define wxLogInfo wxLogVerbose
+#define wxVLogInfo wxVLogVerbose
+
+
+// another special case: the level is passed as first argument of the function
+// and so is not available to the macro
+//
+// notice that because of this, arguments of wxLogGeneric() are currently
+// always evaluated, unlike for the other log functions
+#define wxLogGeneric wxMAKE_LOGGER(Max).LogAtLevel
+#define wxVLogGeneric(level, format, argptr) \
+    if ( !wxLog::IsLevelEnabled(wxLOG_##level, wxLOG_COMPONENT) )             \
+    {}                                                                        \
+    else                                                                      \
+        wxDO_LOGV(level, format, argptr)
+
+
+// wxLogSysError() needs to stash the error code value in the log record info
+// so it needs special handling too; additional complications arise because the
+// error code may or not be present as the first argument
+//
+// notice that we unfortunately can't avoid the call to wxSysErrorCode() even
+// though it may be unneeded if an explicit error code is passed to us because
+// the message might not be logged immediately (e.g. it could be queued for
+// logging from the main thread later) and so we can't to wait until it is
+// logged to determine whether we have last error or not as it will be too late
+// and it will have changed already by then (in fact it even changes when
+// wxString::Format() is called because of vsnprintf() inside it so it can
+// change even much sooner)
+#define wxLOG_KEY_SYS_ERROR_CODE "wx.sys_error"
+
+#define wxLogSysError                                                         \
+    if ( !wxLog::IsLevelEnabled(wxLOG_Error, wxLOG_COMPONENT) )               \
+    {}                                                                        \
+    else                                                                      \
+        wxMAKE_LOGGER(Error).MaybeStore(wxLOG_KEY_SYS_ERROR_CODE,             \
+                                        wxSysErrorCode()).Log
+
+// unfortunately we can't have overloaded macros so we can't define versions
+// both with and without error code argument and have to rely on LogV()
+// overloads in wxLogger to select between them
+#define wxVLogSysError \
+    wxMAKE_LOGGER(Error).MaybeStore(wxLOG_KEY_SYS_ERROR_CODE, \
+                                    wxSysErrorCode()).LogV
+
+#if wxUSE_GUI
+    // wxLogStatus() is similar to wxLogSysError() as it allows to optionally
+    // specify the frame to which the message should go
+    #define wxLOG_KEY_FRAME "wx.frame"
+
+    #define wxLogStatus                                                       \
+        if ( !wxLog::IsLevelEnabled(wxLOG_Status, wxLOG_COMPONENT) )          \
+        {}                                                                    \
+        else                                                                  \
+            wxMAKE_LOGGER(Status).MaybeStore(wxLOG_KEY_FRAME).Log
+
+    #define wxVLogStatus \
+        wxMAKE_LOGGER(Status).MaybeStore(wxLOG_KEY_FRAME).LogV
+#endif // wxUSE_GUI
+
+
+#else // !wxUSE_LOG
+
+#undef wxUSE_LOG_DEBUG
+#define wxUSE_LOG_DEBUG 0
+
+#undef wxUSE_LOG_TRACE
+#define wxUSE_LOG_TRACE 0
+
+#if defined(__WATCOMC__) || defined(__MINGW32__)
+    // Mingw has similar problem with wxLogSysError:
+    #define WX_WATCOM_OR_MINGW_ONLY_CODE( x )  x
+#else
+    #define WX_WATCOM_OR_MINGW_ONLY_CODE( x )

 #endif
 
 #endif
 

+// define macros for defining log functions which do nothing at all
+//
+// WX_WATCOM_ONLY_CODE is needed to work around
+// http://bugzilla.openwatcom.org/show_bug.cgi?id=351
+#define wxDEFINE_EMPTY_LOG_FUNCTION(level)                                  \
+    WX_DEFINE_VARARG_FUNC_NOP(wxLog##level, 1, (const wxFormatString&))     \
+    WX_WATCOM_ONLY_CODE(                                                    \
+        WX_DEFINE_VARARG_FUNC_NOP(wxLog##level, 1, (const char*))           \
+        WX_DEFINE_VARARG_FUNC_NOP(wxLog##level, 1, (const wchar_t*))        \
+        WX_DEFINE_VARARG_FUNC_NOP(wxLog##level, 1, (const wxCStrData&))     \
+    )                                                                       \
+    inline void wxVLog##level(const wxFormatString& WXUNUSED(format),       \
+                              va_list WXUNUSED(argptr)) { }                 \

 
 

-// are we in 'verbose' mode?
-// (note that it's often handy to change this var manually from the
-//  debugger, thus enabling/disabling verbose reporting for some
-//  parts of the program only)
-WXDLLEXPORT_DATA(extern bool) g_bVerbose;
+#define wxDEFINE_EMPTY_LOG_FUNCTION2(level, argclass)                       \
+    WX_DEFINE_VARARG_FUNC_NOP(wxLog##level, 2, (argclass, const wxFormatString&)) \
+    WX_WATCOM_OR_MINGW_ONLY_CODE(                                           \
+        WX_DEFINE_VARARG_FUNC_NOP(wxLog##level, 2, (argclass, const char*)) \
+        WX_DEFINE_VARARG_FUNC_NOP(wxLog##level, 2, (argclass, const wchar_t*)) \
+        WX_DEFINE_VARARG_FUNC_NOP(wxLog##level, 2, (argclass, const wxCStrData&)) \
+    )                                                                       \
+    inline void wxVLog##level(argclass WXUNUSED(arg),                       \
+                              const wxFormatString& WXUNUSED(format),       \
+                              va_list WXUNUSED(argptr)) {}

 
 

-// fwd decl to avoid including iostream.h here
-class ostream;
+wxDEFINE_EMPTY_LOG_FUNCTION(FatalError);
+wxDEFINE_EMPTY_LOG_FUNCTION(Error);
+wxDEFINE_EMPTY_LOG_FUNCTION(SysError);
+wxDEFINE_EMPTY_LOG_FUNCTION2(SysError, long);
+wxDEFINE_EMPTY_LOG_FUNCTION(Warning);
+wxDEFINE_EMPTY_LOG_FUNCTION(Message);
+wxDEFINE_EMPTY_LOG_FUNCTION(Info);
+wxDEFINE_EMPTY_LOG_FUNCTION(Verbose);

 
 

-// ----------------------------------------------------------------------------
-// get error code/error message from system in a portable way
-// ----------------------------------------------------------------------------
+wxDEFINE_EMPTY_LOG_FUNCTION2(Generic, wxLogLevel);

 
 

-// return the last system error code
-unsigned long WXDLLEXPORT wxSysErrorCode();
-// return the error message for given (or last if 0) error code
-const char* WXDLLEXPORT wxSysErrorMsg(unsigned long nErrCode = 0);
+#if wxUSE_GUI
+    wxDEFINE_EMPTY_LOG_FUNCTION(Status);
+    wxDEFINE_EMPTY_LOG_FUNCTION2(Status, wxFrame *);
+#endif // wxUSE_GUI
+
+// Empty Class to fake wxLogNull
+class WXDLLIMPEXP_BASE wxLogNull
+{
+public:
+    wxLogNull() { }
+};
+
+// Dummy macros to replace some functions.
+#define wxSysErrorCode() (unsigned long)0
+#define wxSysErrorMsg( X ) (const wxChar*)NULL
+
+// Fake symbolic trace masks... for those that are used frequently
+#define wxTRACE_OleCalls wxEmptyString // OLE interface calls
+
+#endif // wxUSE_LOG/!wxUSE_LOG
+
+
+// debug functions can be completely disabled in optimized builds
+
+// if these log functions are disabled, we prefer to define them as (empty)
+// variadic macros as this completely removes them and their argument
+// evaluation from the object code but if this is not supported by compiler we
+// use empty inline functions instead (defining them as nothing would result in
+// compiler warnings)
+//
+// note that making wxVLogDebug/Trace() themselves (empty inline) functions is
+// a bad idea as some compilers are stupid enough to not inline even empty
+// functions if their parameters are complicated enough, but by defining them
+// as an empty inline function we ensure that even dumbest compilers optimise
+// them away
+#ifdef __BORLANDC__
+    // but Borland gives "W8019: Code has no effect" for wxLogNop() so we need
+    // to define it differently for it to avoid these warnings (same problem as
+    // with wxUnusedVar())
+    #define wxLogNop() { }
+#else
+    inline void wxLogNop() { }
+#endif
+
+#if wxUSE_LOG_DEBUG
+    #define wxLogDebug wxDO_LOG_IF_ENABLED(Debug)
+    #define wxVLogDebug(format, argptr) wxDO_LOGV(Debug, format, argptr)
+#else // !wxUSE_LOG_DEBUG
+    #define wxVLogDebug(fmt, valist) wxLogNop()
+
+    #ifdef HAVE_VARIADIC_MACROS
+        #define wxLogDebug(fmt, ...) wxLogNop()
+    #else // !HAVE_VARIADIC_MACROS
+        WX_DEFINE_VARARG_FUNC_NOP(wxLogDebug, 1, (const wxFormatString&))
+    #endif
+#endif // wxUSE_LOG_DEBUG/!wxUSE_LOG_DEBUG
+
+#if wxUSE_LOG_TRACE
+    #define wxLogTrace                                                        \
+        if ( !wxLog::IsLevelEnabled(wxLOG_Trace, wxLOG_COMPONENT) )           \
+        {}                                                                    \
+        else                                                                  \
+            wxMAKE_LOGGER(Trace).LogTrace
+    #define wxVLogTrace                                                       \
+        if ( !wxLog::IsLevelEnabled(wxLOG_Trace, wxLOG_COMPONENT) )           \
+        {}                                                                    \
+        else                                                                  \
+            wxMAKE_LOGGER(Trace).LogVTrace
+#else  // !wxUSE_LOG_TRACE
+    #define wxVLogTrace(mask, fmt, valist) wxLogNop()
+
+    #ifdef HAVE_VARIADIC_MACROS
+        #define wxLogTrace(mask, fmt, ...) wxLogNop()
+    #else // !HAVE_VARIADIC_MACROS
+        #if WXWIN_COMPATIBILITY_2_8
+        WX_DEFINE_VARARG_FUNC_NOP(wxLogTrace, 2, (wxTraceMask, const wxFormatString&))
+        #endif
+        WX_DEFINE_VARARG_FUNC_NOP(wxLogTrace, 2, (const wxString&, const wxFormatString&))
+        #ifdef __WATCOMC__
+        // workaround for http://bugzilla.openwatcom.org/show_bug.cgi?id=351
+        WX_DEFINE_VARARG_FUNC_NOP(wxLogTrace, 2, (const char*, const char*))
+        WX_DEFINE_VARARG_FUNC_NOP(wxLogTrace, 2, (const wchar_t*, const wchar_t*))
+        #endif
+    #endif // HAVE_VARIADIC_MACROS/!HAVE_VARIADIC_MACROS
+#endif // wxUSE_LOG_TRACE/!wxUSE_LOG_TRACE
+
+// wxLogFatalError helper: show the (fatal) error to the user in a safe way,
+// i.e. without using wxMessageBox() for example because it could crash
+void WXDLLIMPEXP_BASE
+wxSafeShowMessage(const wxString& title, const wxString& text);

 
 // ----------------------------------------------------------------------------
 // debug only logging functions: use them with API name and error code
 // ----------------------------------------------------------------------------
 
 
 // ----------------------------------------------------------------------------
 // debug only logging functions: use them with API name and error code
 // ----------------------------------------------------------------------------
 

-#ifdef  __DEBUG__
-  #define wxLogApiError(api, rc)                                              \
-                    wxLogDebug("At %s(%d) '%s' failed with error %lx (%s).",  \
-                               __FILE__, __LINE__, api,                       \
-                               rc, wxSysErrorMsg(rc))
-  #define wxLogLastError(api) wxLogApiError(api, wxSysErrorCode())
-#else   //!debug
-  #define wxLogApiError(api, rc)
-  #define wxLogLastError(api)
-#endif  //debug/!debug
-
-#endif  //__LOGH__
+#if wxUSE_LOG_DEBUG
+    // make life easier for people using VC++ IDE: clicking on the message
+    // will take us immediately to the place of the failed API
+#ifdef __VISUALC__
+    #define wxLogApiError(api, rc)                                            \
+        wxLogDebug(wxT("%s(%d): '%s' failed with error 0x%08lx (%s)."),       \
+                   __FILE__, __LINE__, api,                                   \
+                   (long)rc, wxSysErrorMsg(rc))
+#else // !VC++
+    #define wxLogApiError(api, rc)                                            \
+        wxLogDebug(wxT("In file %s at line %d: '%s' failed with ")            \
+                   wxT("error 0x%08lx (%s)."),                                \
+                   __FILE__, __LINE__, api,                                   \
+                   (long)rc, wxSysErrorMsg(rc))
+#endif // VC++/!VC++
+
+    #define wxLogLastError(api) wxLogApiError(api, wxSysErrorCode())
+
+#else // !wxUSE_LOG_DEBUG
+    #define wxLogApiError(api, err) wxLogNop()
+    #define wxLogLastError(api) wxLogNop()
+#endif // wxUSE_LOG_DEBUG/!wxUSE_LOG_DEBUG
+
+// wxCocoa has additiional trace masks
+#if defined(__WXCOCOA__)
+#include "wx/cocoa/log.h"
+#endif
+
+#ifdef WX_WATCOM_ONLY_CODE
+    #undef WX_WATCOM_ONLY_CODE
+#endif
+
+// macro which disables debug logging in release builds: this is done by
+// default by wxIMPLEMENT_APP() so usually it doesn't need to be used explicitly
+#if defined(NDEBUG) && wxUSE_LOG_DEBUG
+    #define wxDISABLE_DEBUG_LOGGING_IN_RELEASE_BUILD() \
+        wxLog::SetLogLevel(wxLOG_Info)
+#else // !NDEBUG
+    #define wxDISABLE_DEBUG_LOGGING_IN_RELEASE_BUILD()
+#endif // NDEBUG/!NDEBUG
+
+#endif  // _WX_LOG_H_
+