recognize 646 charset as US-ASCII (this is how it is used by Solaris)

[wxWidgets.git] / src / msw / helpbest.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        helpbest.cpp
// Purpose:     Tries to load MS HTML Help, falls back to wxHTML upon failure
// Author:      Mattia Barbon
// Modified by:
// Created:     02/04/2001
// RCS-ID:      $Id$
// Copyright:   (c) Mattia Barbon
// Licence:   	wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifdef __GNUG__
#pragma implementation "helpbest.h"
#endif

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

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#ifndef WX_PRECOMP
#include "wx/defs.h"
#endif

#include "wx/filefn.h"

#if wxUSE_HELP && wxUSE_MS_HTML_HELP && defined(__WIN95__) && wxUSE_WXHTML_HELP
#include "wx/msw/helpchm.h"
#include "wx/html/helpctrl.h"
#include "wx/msw/helpbest.h"

IMPLEMENT_DYNAMIC_CLASS( wxBestHelpController, wxHelpControllerBase );

bool wxBestHelpController::Initialize( const wxString& filename )
{
    // try wxCHMHelpController
    wxCHMHelpController* chm = new wxCHMHelpController;

    m_helpControllerType = wxUseChmHelp;
    // do not warn upon failure
    wxLogNull dontWarnOnFailure;

    if( chm->Initialize( GetValidFilename( filename ) ) )
    {
        m_helpController = chm;
        return TRUE;
    }

    // failed
    delete chm;

    // try wxHtmlHelpController
    wxHtmlHelpController* html = new wxHtmlHelpController;

    m_helpControllerType = wxUseHtmlHelp;
    if( html->Initialize( GetValidFilename( filename ) ) )
    {
        m_helpController = html;
        return TRUE;
    }

    // failed
    delete html;

    return FALSE;
}

wxString wxBestHelpController::GetValidFilename( const wxString& filename ) const
{
    wxString tmp = filename;
    ::wxStripExtension( tmp );

    switch( m_helpControllerType )
    {
    case wxUseChmHelp:
        if( ::wxFileExists( tmp + ".chm" ) )
            return tmp + ".chm";

        return filename;
        break;
    case wxUseHtmlHelp:
        if( ::wxFileExists( tmp + ".htb" ) )
            return tmp + ".htb";
        if( ::wxFileExists( tmp + ".zip" ) )
            return tmp + ".zip";
        if( ::wxFileExists( tmp + ".hhp" ) )
            return tmp + ".hhp";

        return filename;
        break;
    default:
        // we CAN'T get here
        wxFAIL_MSG( wxT("wxBestHelpController: Must call Initialize, first!") );
        return wxEmptyString;
        break;
    }
}

#endif
    // wxUSE_HELP && wxUSE_MS_HTML_HELP && defined(__WIN95__) && wxUSE_WXHTML_HELP