source: smplayer/trunk/src/screensaver.cpp

/*  smplayer, GUI front-end for mplayer.
    Copyright (C) 2006-2017 Ricardo Villalba <rvm@users.sourceforge.net>

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

    This program 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include <Qt>
#include <QSysInfo>
#include "screensaver.h"
#ifndef Q_OS_OS2
#include <windows.h>
#endif

WinScreenSaver::WinScreenSaver() {
#ifndef Q_OS_OS2
        lowpower = poweroff = screensaver = 0;
#else
        SSaver = new QLibrary("SSCORE");
        SSaver->load();
        SSCore_TempDisable = SSCore_TempEnable = NULL;
        if (SSaver->isLoaded()) {
                SSCore_TempDisable = (FuncPtr) SSaver->resolve("SSCore_TempDisable");
                SSCore_TempEnable = (FuncPtr) SSaver->resolve("SSCore_TempEnable");
        }
#endif
        state_saved = false;
        modified = false;
        
        retrieveState();
}

WinScreenSaver::~WinScreenSaver() {
        restoreState();
#ifdef Q_OS_OS2
        unload();
#endif
}

void WinScreenSaver::retrieveState() {
        qDebug("WinScreenSaver::retrieveState");
        
        if (!state_saved) {
#ifndef Q_OS_OS2
                if (QSysInfo::WindowsVersion < QSysInfo::WV_VISTA) {
                        // Not supported on Windows Vista
                        SystemParametersInfo(SPI_GETLOWPOWERTIMEOUT, 0, &lowpower, 0);
                        SystemParametersInfo(SPI_GETPOWEROFFTIMEOUT, 0, &poweroff, 0);
                }
                SystemParametersInfo(SPI_GETSCREENSAVETIMEOUT, 0, &screensaver, 0);
                state_saved = true;
                
                qDebug("WinScreenSaver::retrieveState: lowpower: %d, poweroff: %d, screensaver: %d", lowpower, poweroff, screensaver);
#else
                state_saved = true;
                qDebug("WinScreensaver::retrieveState: init done %s", SSCore_TempDisable ?"succesfully":"failed");
#endif
        } else {
                qDebug("WinScreenSaver::retrieveState: state already saved previously, doing nothing");
        }
}

void WinScreenSaver::restoreState() {
        if (!modified) {
                qDebug("WinScreenSaver::restoreState: state did not change, doing nothing");
                return;
        }
        
        if (state_saved) {
#ifndef Q_OS_OS2
                if (QSysInfo::WindowsVersion < QSysInfo::WV_VISTA) {
                        // Not supported on Windows Vista
                        SystemParametersInfo(SPI_SETLOWPOWERTIMEOUT, lowpower, NULL, 0);
                        SystemParametersInfo(SPI_SETPOWEROFFTIMEOUT, poweroff, NULL, 0);
                }
                SystemParametersInfo(SPI_SETSCREENSAVETIMEOUT, screensaver, NULL, 0);
                SetThreadExecutionState(ES_CONTINUOUS);

                qDebug("WinScreenSaver::restoreState: lowpower: %d, poweroff: %d, screensaver: %d", lowpower, poweroff, screensaver);
#else
                if (SSCore_TempEnable) {
                        SSCore_TempEnable();
                }
                qDebug("WinScreenSaver::restoreState done");
#endif
        } else {
                qWarning("WinScreenSaver::restoreState: no data, doing nothing");
        }
}

#ifdef Q_OS_OS2
void WinScreenSaver::unload() {
        if (SSaver->isLoaded()) {
                SSaver->unload();
                delete SSaver;
        }
}
#endif
        
void WinScreenSaver::disable() {
        qDebug("WinScreenSaver::disable");

#ifndef Q_OS_OS2
        if (QSysInfo::WindowsVersion < QSysInfo::WV_VISTA) {
                // Not supported on Windows Vista
                SystemParametersInfo(SPI_SETLOWPOWERTIMEOUT, 0, NULL, 0);
                SystemParametersInfo(SPI_SETPOWEROFFTIMEOUT, 0, NULL, 0);
        }
        SystemParametersInfo(SPI_SETSCREENSAVETIMEOUT, 0, NULL, 0);
        SetThreadExecutionState(ES_CONTINUOUS | ES_DISPLAY_REQUIRED);
#else
        if (SSCore_TempDisable) {
                SSCore_TempDisable();
        }
#endif

        modified = true;
}

void WinScreenSaver::enable() {
        qDebug("WinScreenSaver::enable");

        restoreState();
}