一个拖动无标题栏窗体的方法 修正

下载全部代码：http://www.cckan.net/forum.php?mod=viewthread&tid=68

上次文章地址http://www.cnblogs.com/sufei/archive/2009/05/06/1450683.html

上次写了一个一个拖动无标题栏窗体的方法 发现有一些问题就是每次单击的时候 会向上移动两个像素，现在修改一下                                                          

 private bool isMouseDown = false;
        private Point FormLocation;     //form的location
        private Point mouseOffset;      //鼠标的按下位置


        private void Messages_MouseDown(object sender, MouseEventArgs e)
        {
            try
            {
                if (e.Button == MouseButtons.Left)
                {
                    isMouseDown = true;
                    FormLocation = this.Location;
                    mouseOffset = Control.MousePosition;
                }

            }
            catch (Exception)
            {

            }

        }


        private void Messages_MouseMove(object sender, MouseEventArgs e)
        {
            try
            {
                int _x = 0;
                int _y = 0;
                if (isMouseDown)
                {
                    Point pt = Control.MousePosition;
                    _x = mouseOffset.X - pt.X;
                    _y = mouseOffset.Y - pt.Y;

                    this.Location = new Point(FormLocation.X - _x, FormLocation.Y - _y);
                }

            }
            catch (Exception )
            {

            }

        }

        private void Messages_MouseUp(object sender, MouseEventArgs e)
        {
            try
            {
                isMouseDown = false;

            }
            catch (Exception)
            {

            }

        }