/*
 * Idle_x11.cpp - detect desktop idle time
 * Copyright (C) 2003  Justin Karneges
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */
#ifndef COMPILE_ON_MAC
#if !defined(COMPILE_ON_WINDOWS) && !defined(COMPILE_ON_MINGW)

#include"Idle.h"

#ifndef COMPILE_XSS_SUPPORT
	IdlePlatform::IdlePlatform() {}
	IdlePlatform::~IdlePlatform() {}
	bool IdlePlatform::init() const { return false; }
	int IdlePlatform::secondsIdle() const { return 0; }
#else
	#include <QApplication>
	#include <QDesktopWidget>
	#include <QX11Info>

	#include <X11/Xlib.h>
	#include <X11/Xutil.h>
	#include <X11/extensions/scrnsaver.h>

	static XErrorHandler old_handler = 0;
	extern "C" int xerrhandler(Display* dpy, XErrorEvent* err)
	{
		if(err->error_code == BadDrawable)
			return 0;

		return (*old_handler)(dpy, err);
	}

	class IdlePlatform::Private
	{
	public:
		Private() {}

		XScreenSaverInfo *ss_info;
	};

	IdlePlatform::IdlePlatform()
	{
		d = new Private;
		d->ss_info = 0;
	}

	IdlePlatform::~IdlePlatform()
	{
		if(d->ss_info)
			XFree(d->ss_info);
		if(old_handler) {
			XSetErrorHandler(old_handler);
			old_handler = 0;
		}
		delete d;
	}

	bool IdlePlatform::init() const
	{
		if(d->ss_info)
			return true;

		old_handler = XSetErrorHandler(xerrhandler);

		int event_base, error_base;
		if(XScreenSaverQueryExtension(QX11Info::display(), &event_base, &error_base)) {
			d->ss_info = XScreenSaverAllocInfo();
			return true;
		}
		return false;
	}

	int IdlePlatform::secondsIdle() const
	{
		if(!d->ss_info) return 0;
		if(!XScreenSaverQueryInfo(QX11Info::display(), QX11Info::appRootWindow(), d->ss_info)) return 0;
		return d->ss_info->idle / 1000;
	}
#endif
#endif
#endif
