/////////////////////////////////////////////////////////////////////////////
// Name:        helpbase.h
// Purpose:     Help system base classes
// Author:      Julian Smart
// Modified by:
// Created:     04/01/98
// RCS-ID:      $Id$
// Copyright:   (c) Julian Smart and Markus Holzem
// Licence:   	wxWindows license
/////////////////////////////////////////////////////////////////////////////

#ifndef _WX_HELPBASEH__
#define _WX_HELPBASEH__

#ifdef __GNUG__
#pragma interface "helpbase.h"
#endif

#include "wx/defs.h"
#include "wx/object.h"
#include "wx/string.h"
#include "wx/gdicmn.h"
#include "wx/frame.h"

#if wxUSE_HELP

// Flags for SetViewer
#define wxHELP_NETSCAPE     1

// Defines the API for help controllers
class WXDLLEXPORT wxHelpControllerBase: public wxObject
{
  DECLARE_CLASS(wxHelpControllerBase)

 public:
  inline wxHelpControllerBase() {}
  inline ~wxHelpControllerBase() {};

  // Must call this to set the filename and server name.
  // server is only required when implementing TCP/IP-based
  // help controllers.
  virtual bool Initialize(const wxString& WXUNUSED(file), int WXUNUSED(server) ) { return FALSE; }
  virtual bool Initialize(const wxString& WXUNUSED(file)) { return FALSE; }

  // Set viewer: only relevant to some kinds of controller
  virtual void SetViewer(const wxString& WXUNUSED(viewer), long WXUNUSED(flags) = 0) {}

  // If file is "", reloads file given  in Initialize
  virtual bool LoadFile(const wxString& file = "") = 0;
  virtual bool DisplayContents(void) = 0;
  virtual bool DisplaySection(int sectionNo) = 0;
  virtual bool DisplayBlock(long blockNo) = 0;
  virtual bool KeywordSearch(const wxString& k) = 0;
  /// Allows one to override the default settings for the help frame.
  virtual void SetFrameParameters(const wxString& WXUNUSED(title),
                                   const wxSize& WXUNUSED(size),
                                   const wxPoint& WXUNUSED(pos) = wxDefaultPosition,
                                   bool WXUNUSED(newFrameEachTime) = FALSE)
      {
         // does nothing by default
      }
   /// Obtains the latest settings used by the help frame and the help 
   /// frame.
   virtual wxFrame *GetFrameParameters(wxSize *WXUNUSED(size) = NULL,
                                   wxPoint *WXUNUSED(pos) = NULL,
                                   bool *WXUNUSED(newFrameEachTime) = NULL)
      {
         return (wxFrame*) NULL;// does nothing by default
      }

  virtual bool Quit(void) = 0;
  virtual void OnQuit(void) {};
};


/* By default, if wxHTML is compiled in, use the
   wxHelpControllerHtml. If not, use the external help controller.
   (of course, we shouldn't do it for wxMSW)
*/
#ifndef __WXMSW__
#if wxUSE_HTML
#   include "wx/generic/helpwxht.h"
#   define wxHelpController wxHelpControllerHtml
#   define sm_classwxHelpController sm_classwxHelpControllerHtml
#else
#   include "wx/generic/helpext.h"
#   define wxHelpController wxExtHelpController
#   define sm_classwxHelpController sm_classwxExtHelpController
#endif
#endif // wxMSW

#endif // wxUSE_HELP
#endif
    // _WX_HELPBASEH__