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  *   ˆl–Ým_J*n-jm@?pLÜhJbÑ¿¿ƒyÖÃ_†I|¥+ÃÂ "/    // * This makes emacs happy -*-Mode: C++;-*-
// vile:cppmode
/****************************************************************************
 * Copyright 2019-2020,2021 Thomas E. Dickey                                *
 * Copyright 1998-2012,2014 Free Software Foundation, Inc.                  *
 *                                                                          *
 * Permission is hereby granted, free of charge, to any person obtaining a  *
 * copy of this software and associated documentation files (the            *
 * "Software"), to deal in the Software without restriction, including      *
 * without limitation the rights to use, copy, modify, merge, publish,      *
 * distribute, distribute with modifications, sublicense, and/or sell       *
 * copies of the Software, and to permit persons to whom the Software is    *
 * furnished to do so, subject to the following conditions:                 *
 *                                                                          *
 * The above copyright notice and this permission notice shall be included  *
 * in all copies or substantial portions of the Software.                   *
 *                                                                          *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
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 ****************************************************************************/

/****************************************************************************
 *   Author: Juergen Pfeifer, 1997                                          *
 ****************************************************************************/

#ifndef NCURSES_CURSESP_H_incl
#define NCURSES_CURSESP_H_incl 1

// $Id: cursesp.h,v 1.35 2021/04/17 18:11:08 tom Exp $

#include <cursesw.h>

extern "C" {
#  include <panel.h>
}

class NCURSES_CXX_IMPEXP NCursesPanel
  : public NCursesWindow
{
protected:
  PANEL *p;
  static NCursesPanel *dummy;

private:
  // This structure is used for the panel's user data field to link the
  // PANEL* to the C++ object and to provide extra space for a user pointer.
  typedef struct {
    void*               m_user;      // the pointer for the user's data
    const NCursesPanel* m_back;      // backward pointer to C++ object
    const PANEL*        m_owner;     // the panel itself
  } UserHook;

  inline UserHook *UserPointer()
  {
    UserHook* uptr = reinterpret_cast<UserHook*>(
                           const_cast<void *>(::panel_userptr (p)));
    return uptr;
  }

  void init();                       // Initialize the panel object

protected:
  void set_user(void *user)
  {
    UserHook* uptr = UserPointer();
    if (uptr != 0 && uptr->m_back==this && uptr->m_owner==p) {
      uptr->m_user = user;
    }
  }
  // Set the user pointer of the panel.

  void *get_user()
  {
    UserHook* uptr = UserPointer();
    void *result = 0;
    if (uptr != 0 && uptr->m_back==this && uptr->m_owner==p)
      result = uptr->m_user;