BizHawk/BizHawk.MultiClient/ScreenSaver.cs

using System;
using System.Runtime.InteropServices;

namespace BizHawk.MultiClient
{
    // Derived from http://www.codeproject.com/KB/cs/ScreenSaverControl.aspx
    public static class ScreenSaver
    {
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        private static extern bool SystemParametersInfo(int uAction, int uParam, ref int lpvParam, int flags);

        private const int SPI_GETSCREENSAVERTIMEOUT = 14;
        private const int SPI_SETSCREENSAVERTIMEOUT = 15;
        private const int SPIF_SENDWININICHANGE = 2;

        public static void ResetTimerImmediate()
        {
            SetScreenSaverTimeout(GetScreenSaverTimeout());
        }

        private static int ctr;
        public static void ResetTimerPeriodically()
        {
            ctr++;
            if (ctr == 120)
            {
                SetScreenSaverTimeout(GetScreenSaverTimeout());
                ctr = 0;
            }
        }

        // Returns the screen saver timeout setting, in seconds
        private static Int32 GetScreenSaverTimeout()
        {
            Int32 value = 0;
            SystemParametersInfo(SPI_GETSCREENSAVERTIMEOUT, 0, ref value, 0);
            return value;
        }

        // Pass in the number of seconds to set the screen saver timeout value.
        private static void SetScreenSaverTimeout(Int32 Value)
        {
            int nullVar = 0;
            SystemParametersInfo(SPI_SETSCREENSAVERTIMEOUT, Value, ref nullVar, SPIF_SENDWININICHANGE);
        }
    }
}