窗体靠近屏幕边缘自动隐藏*学习（类似于QQ）

public frmLogin()
       {
           InitializeComponent();
           timer1.Start();
       }
       [DllImport("User32.dll")]
       public static extern bool PtInRect(ref Rectangle Rects, Point lpPoint);

private void timer1_Tick(object sender, EventArgs e)
       {
           if (this.WindowState == FormWindowState.Normal)
           {
               System.Drawing.Point cursorPoint = new Point(Cursor.Position.X, Cursor.Position.Y);//获取鼠标在屏幕的坐标点
               Rectangle Rects = new Rectangle(this.Left, this.Top, this.Left + this.Width, this.Top + this.Height);//存储当前窗体在屏幕的所在区域
               bool prInRect = PtInRect(ref Rects, cursorPoint);
               if (prInRect)
               {//当鼠标在当前窗体内
                   if (this.Top < 0)//窗体的Top属性小于0
                       this.Top = 0;
                   else if (this.Left < 0)//窗体的Left属性小于0
                       this.Left = 0;
                   else if (this.Right > Screen.PrimaryScreen.WorkingArea.Width)//窗体的Right属性大于屏幕宽度
                       this.Left = Screen.PrimaryScreen.WorkingArea.Width - this.Width;
               }
               else
               {
                   if (this.Top < 5)               //当窗体的上边框与屏幕的顶端的距离小于5时
                       this.Top = 5 - this.Height; //将窗体隐藏到屏幕的顶端
                   else if (this.Left < 5)         //当窗体的左边框与屏幕的左端的距离小于5时
                       this.Left = 5 - this.Width; //将窗体隐藏到屏幕的左端
                   else if (this.Right > Screen.PrimaryScreen.WorkingArea.Width - 5)//当窗体的右边框与屏幕的右端的距离小于5时
                       this.Left = Screen.PrimaryScreen.WorkingArea.Width - 5;//将窗体隐藏到屏幕的右端
               }
           }