C # code base の personal movable button "relevant code."

Technorati Tags: C # , movable codes , button

        #region 可移动按钮“相关代码”

        Point mouse_offset;
        private void Button_MouseDown(object sender , MouseEventArgs e)
        {
            mouse_offset = e.Location; //将当前鼠标相对于“窗体”左上角的坐标赋值给mouse_offset
        }

        private void Button_MouseMove(object sender , MouseEventArgs e)
        {

            if ( e.Button == MouseButtons.Left )
            {
                //将相对屏幕坐标转换为相对工作区的坐标。
                int left = PointToClient(Control.MousePosition).X - mouse_offset.X;
                int top = PointToClient(Control.MousePosition).Y - mouse_offset.Y;
                
                //左右可能越界
                if(left<0)
                    left=0;
                if ( left > this.Width )
                    left = this.Width - ( (Button)sender ).Width;

                //上下可能越界
                if ( top < 0 )
                    top = 0;
                if ( top > this.Height )
                    top = this.Height - ( (Button)sender ).Height;

                
                ( (Button)sender ).Left = left;
                ( (Button)sender ).Top = top;
            }
        }

        #endregion

Reproduced in: https: //www.cnblogs.com/AsionTang/archive/2010/11/20/1885705.html