/* This file is part of the KDE libraries
    Copyright (C) 1997 Matthias Kalle Dalheimer (kalle@kde.org)

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
*/

#ifndef KWORKSPACE_H
#define KWORKSPACE_H

#include <kdemacros.h>

namespace KWorkSpace
{
 
  /**
   * The possible values for the @p confirm parameter of requestShutDown().
   */
  enum ShutdownConfirm {
    /**
     * Obey the user's confirmation setting.
     */
    ShutdownConfirmDefault = -1,
    /**
     * Don't confirm, shutdown without asking.
     */
    ShutdownConfirmNo = 0,
    /**
     * Always confirm, ask even if the user turned it off.
     */
    ShutdownConfirmYes = 1
  };

  /**
   * The possible values for the @p sdtype parameter of requestShutDown().
   */
  enum ShutdownType {
    /**
     * Select previous action or the default if it's the first time.
     */
    ShutdownTypeDefault = -1,
    /**
     * Only log out
     */
    ShutdownTypeNone = 0,
    /**
     * Log out and reboot the machine.
     */
    ShutdownTypeReboot = 1,
    /**
     * Log out and halt the machine.
     */
    ShutdownTypeHalt = 2,
    /**
     * Temporary brain damage. Don't use. Same as ShutdownTypeNone
     */
    // KDE5: kill this
    ShutdownTypeLogout = 3
  };

  /**
   * The possible values for the @p sdmode parameter of requestShutDown().
   */
  // KDE5: this seems fairly useless
  enum ShutdownMode {
    /**
     * Select previous mode or the default if it's the first time.
     */
    ShutdownModeDefault = -1,
    /**
     * Schedule a shutdown (halt or reboot) for the time all active sessions
     * have exited.
     */
    ShutdownModeSchedule = 0,
    /**
     * Shut down, if no sessions are active. Otherwise do nothing.
     */
    ShutdownModeTryNow = 1,
    /**
     * Force shutdown. Kill any possibly active sessions.
     */
    ShutdownModeForceNow = 2,
    /**
     * Pop up a dialog asking the user what to do if sessions are still active.
     */
    ShutdownModeInteractive = 3
  };

  /**
   * Asks the session manager to shut the session down.
   *
   * Using @p confirm == ShutdownConfirmYes or @p sdtype != ShutdownTypeDefault or
   * @p sdmode != ShutdownModeDefault causes the use of ksmserver's DCOP
   * interface. The remaining two combinations use the standard XSMP and
   * will work with any session manager compliant with it.
   *
   * @param confirm Whether to ask the user if he really wants to log out.
   * ShutdownConfirm
   * @param sdtype The action to take after logging out. ShutdownType
   * @param sdmode If/When the action should be taken. ShutdownMode
   * @return true on success, false if the session manager could not be
   * contacted.
   */
  KDE_EXPORT bool requestShutDown( ShutdownConfirm confirm = ShutdownConfirmDefault,
                                   ShutdownType    sdtype  = ShutdownTypeDefault,
                                   ShutdownMode    sdmode  = ShutdownModeDefault );

  /**
   * Used to check whether a requestShutDown call with the same arguments
   * has any chance of succeeding.
   *
   * For example, if KDE's own session manager cannot be contacted, we can't
   * demand that the computer be shutdown, or force a confirmation dialog.
   *
   * Even if we can access the KDE session manager, the system or user
   * configuration may prevent the user from requesting a shutdown or
   * reboot.
   */
  KDE_EXPORT bool canShutDown( ShutdownConfirm confirm = ShutdownConfirmDefault,
                               ShutdownType    sdtype  = ShutdownTypeDefault,
                               ShutdownMode    sdmode  = ShutdownModeDefault );

  /**
   * Propagates the network address of the session manager in the
   * SESSION_MANAGER environment variable so that child processes can
   * pick it up.
   *
   * If SESSION_MANAGER isn't defined yet, the address is searched in
   * $HOME/.KSMserver.
   *
   * This function is called by clients that are started outside the
   * session ( i.e. before ksmserver is started), but want to launch
   * other processes that should participate in the session.  Examples
   * are kdesktop or kicker.
   */
   KDE_EXPORT void propagateSessionManager();

   /**
    * This function should be called at startup to prevent heap fragmentation
    * in applications that perform many low-level pixmap operations (e.g. kwin).
    *
    * It lowers the threshold above which the glibc returns the memory to the kernel
    * from 120 kB of free space at the end of the heap to 5*pagesize (= 20 kB for x86-64).
    */
   KDE_EXPORT void trimMalloc();

}

#endif
