C# 窗体自动停靠隐藏

private void WindowShowHide()
        {
            if (this.WindowState == FormWindowState.Normal)
            {
                Point cursorPoint = new Point(Cursor.Position.X, Cursor.Position.Y);
                Rectangle rectgle = new Rectangle(this.Left, this.Top, this.Left + this.Width, this.Top + this.Height);
                bool ptInRect = PtInRect(ref rectgle, cursorPoint);
                if (ptInRect)
                {
                    if (this.Top < 0)
                    {
                        this.Top = 0;
                    }
                    else if (this.Left < 0)
                    {
                        this.Left = 0;
                    }
                    else if (this.Right > Screen.PrimaryScreen.WorkingArea.Width)
                    {
                        this.Left = Screen.PrimaryScreen.WorkingArea.Width - this.Width;
                    }
                }
                else
                {
                    if (this.Top < 5)
                    {
                        this.Top = -this.Height + 5;
                    }
                    else if (this.Left < 5)
                    {
                        this.Left = -this.Width + 5;
                    }
                    else if (this.Right > Screen.PrimaryScreen.WorkingArea.Width - 5)
                    {
                        this.Left = Screen.PrimaryScreen.WorkingArea.Width - 5;
                    }
                }
            }
        }

　　

private void CopyQQ_Move(object sender, EventArgs e)
        {
            WindowShowHide();
        }

        private void CopyQQ_MouseMove(object sender, MouseEventArgs e)
        {
            WindowShowHide();
        }

        private void CopyQQ_MouseLeave(object sender, EventArgs e)
        {
            WindowShowHide(); 
        }