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///////////////////////////////////////////////////////////////////////////////
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// Purpose: wxMessageOutput class. Shows a message to the user
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// Author: Mattia Barbon
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// RCS-ID: $Id: msgout.h 61459 2009-07-18 23:22:51Z VZ $
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// Copyright: (c) Mattia Barbon
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// Licence: wxWindows licence
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///////////////////////////////////////////////////////////////////////////////
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// ----------------------------------------------------------------------------
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// ----------------------------------------------------------------------------
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#include "wx/chartype.h"
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#include "wx/strvararg.h"
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// ----------------------------------------------------------------------------
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// wxMessageOutput is a class abstracting formatted output target, i.e.
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// something you can printf() to
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// ----------------------------------------------------------------------------
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// NB: VC6 has a bug that causes linker errors if you have template methods
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// in a class using __declspec(dllimport). The solution is to split such
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// class into two classes, one that contains the template methods and does
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// *not* use WXDLLIMPEXP_BASE and another class that contains the rest
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// (with DLL linkage).
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class wxMessageOutputBase
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virtual ~wxMessageOutputBase() { }
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// show a message to the user
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// void Printf(const wxString& format, ...) = 0;
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WX_DEFINE_VARARG_FUNC_VOID(Printf, 1, (const wxFormatString&),
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DoPrintfWchar, DoPrintfUtf8)
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// workaround for http://bugzilla.openwatcom.org/show_bug.cgi?id=351
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WX_VARARG_WATCOM_WORKAROUND(void, Printf, 1, (const wxString&),
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(wxFormatString(f1)));
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WX_VARARG_WATCOM_WORKAROUND(void, Printf, 1, (const wxCStrData&),
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(wxFormatString(f1)));
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WX_VARARG_WATCOM_WORKAROUND(void, Printf, 1, (const char*),
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(wxFormatString(f1)));
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WX_VARARG_WATCOM_WORKAROUND(void, Printf, 1, (const wchar_t*),
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(wxFormatString(f1)));
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// called by DoPrintf() to output formatted string but can also be called
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// directly if no formatting is needed
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virtual void Output(const wxString& str) = 0;
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// NB: this is pure virtual so that it can be implemented in dllexported
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// wxMessagOutput class
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#if !wxUSE_UTF8_LOCALE_ONLY
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virtual void DoPrintfWchar(const wxChar *format, ...) = 0;
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#if wxUSE_UNICODE_UTF8
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virtual void DoPrintfUtf8(const char *format, ...) = 0;
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// "non dll-interface class 'wxStringPrintfMixin' used as base interface
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// for dll-interface class 'wxString'" -- this is OK in our case
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#pragma warning (push)
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#pragma warning (disable:4275)
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class WXDLLIMPEXP_BASE wxMessageOutput : public wxMessageOutputBase
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virtual ~wxMessageOutput() { }
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// gets the current wxMessageOutput object (may be NULL during
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// initialization or shutdown)
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static wxMessageOutput* Get();
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// sets the global wxMessageOutput instance; returns the previous one
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static wxMessageOutput* Set(wxMessageOutput* msgout);
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#if !wxUSE_UTF8_LOCALE_ONLY
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virtual void DoPrintfWchar(const wxChar *format, ...);
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#if wxUSE_UNICODE_UTF8
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virtual void DoPrintfUtf8(const char *format, ...);
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static wxMessageOutput* ms_msgOut;
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#pragma warning (pop)
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// ----------------------------------------------------------------------------
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// implementation which sends output to stderr or specified file
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// ----------------------------------------------------------------------------
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class WXDLLIMPEXP_BASE wxMessageOutputStderr : public wxMessageOutput
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wxMessageOutputStderr(FILE *fp = stderr) : m_fp(fp) { }
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virtual void Output(const wxString& str);
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// return the string with "\n" appended if it doesn't already terminate
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// with it (in which case it's returned unchanged)
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wxString AppendLineFeedIfNeeded(const wxString& str);
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// ----------------------------------------------------------------------------
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// implementation showing the message to the user in "best" possible way:
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// uses stderr or message box if available according to the flag given to ctor.
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// ----------------------------------------------------------------------------
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enum wxMessageOutputFlags
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wxMSGOUT_PREFER_STDERR = 0, // use stderr if available (this is the default)
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wxMSGOUT_PREFER_MSGBOX = 1 // always use message box if available
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class WXDLLIMPEXP_BASE wxMessageOutputBest : public wxMessageOutputStderr
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wxMessageOutputBest(wxMessageOutputFlags flags = wxMSGOUT_PREFER_STDERR)
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virtual void Output(const wxString& str);
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wxMessageOutputFlags m_flags;
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// ----------------------------------------------------------------------------
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// implementation which shows output in a message box
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// ----------------------------------------------------------------------------
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#if wxUSE_GUI && wxUSE_MSGDLG
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class WXDLLIMPEXP_CORE wxMessageOutputMessageBox : public wxMessageOutput
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wxMessageOutputMessageBox() { }
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virtual void Output(const wxString& str);
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#endif // wxUSE_GUI && wxUSE_MSGDLG
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// ----------------------------------------------------------------------------
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// implementation using the native way of outputting debug messages
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// ----------------------------------------------------------------------------
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class WXDLLIMPEXP_BASE wxMessageOutputDebug : public wxMessageOutputStderr
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wxMessageOutputDebug() { }
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virtual void Output(const wxString& str);
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// ----------------------------------------------------------------------------
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// implementation using wxLog (mainly for backwards compatibility)
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// ----------------------------------------------------------------------------
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class WXDLLIMPEXP_BASE wxMessageOutputLog : public wxMessageOutput
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wxMessageOutputLog() { }
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virtual void Output(const wxString& str);
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#endif // _WX_MSGOUT_H_