自动锁定程序：设置闲置超时锁屏功能

 //add by huangqirong 2011-08-16 STORY #1314
        private DateTime LeaveTime=new DateTime();
        private Point prevPoint=new Point();
        private bool useState = true;
        private Timer lookCount = new Timer();
        private bool lockState = false;
        ///---end---

        /// <summary>
        /// add by huangqirong 2011-08-16 STORY #1314
        /// </summary>
        private void setDiffDate(DateTime nowTime)
        {
            if (!lockState)
            {
                TimeSpan spaceTime = nowTime - this.LeaveTime;
                double spaceMinutes = spaceTime.TotalMinutes;
                Point nowPoint = new Point();
                foreach (Form form in Application.OpenForms)
                {
                    if (form.Name.Equals("FrmMain") && form.TopLevel)
                    {
                        form.MouseDown += new MouseEventHandler(this.Mouse_Down);
                    }
                    else if (form.TopLevel)
                    {
                        form.Deactivate += new EventHandler(this.FrmMainOrLeaveFrm_Deactivate);
                        form.Activated += new EventHandler(this.FrmMainOrLeaveFrm_Activated);
                        form.MouseDown += new MouseEventHandler(this.Mouse_Down);
                    }