移动鼠标时按钮跟着移动

class MoveAccessPoint
    {
        bool IsMoving = false;
        Point pCtrlLastCoordinate = new Point(0, 0);
        Point pCursorOffset = new Point(0, 0);
        Point pCursorLastCoordinate = new Point(0, 0);
        private Control ctrl = null;
        private ScrollableControl Containe = null;

        #region 私有方法
        /// <summary>
        /// 在鼠标左键按下的状态记录鼠标当前的位置,以及被移动组件的当前位置
        /// </summary>
        private void DeviceMouseDown(object sender, MouseEventArgs e)
        {
            Button currentButton = (Button)sender;
            if (Containe == null)
            {
                return;
            }
            if (e.Button == MouseButtons.Left)
            {

                IsMoving = true;
                pCtrlLastCoordinate.X = currentButton.Left;
                pCtrlLastCoordinate.Y = currentButton.Top;
                pCursorLastCoordinate.X = Cursor.Position.X;
                pCursorLastCoordinate.Y = Cursor.Position.Y;
                 
            }
        }
        private void DeviceMouseMove(object sender, MouseEventArgs e)
        {
            Button currentButton = (Button)sender;
            if (Containe == null)
            {
                return;
            }

            if (e.Button == MouseButtons.Left)
            {
                if (this.IsMoving)
                {


                    Point pCursor = new Point(Cursor.Position.X, Cursor.Position.Y);
                    //Point pCursor = Containe.PointToClient(Cursor.Position);

                    pCursorOffset.X = pCursor.X - pCursorLastCoordinate.X;
                    pCursorOffset.Y = pCursor.Y - pCursorLastCoordinate.Y;



                    currentButton.Left = pCtrlLastCoordinate.X + pCursorOffset.X;
                    currentButton.Top = pCtrlLastCoordinate.Y + pCursorOffset.Y;


                    //修正参数

                    if (currentButton.Left < 0)
                        currentButton.Left = 0;
                    if (currentButton.Top < 0)
                        currentButton.Top = 0;
                    if (currentButton.Left + currentButton.Width > this.Containe.HorizontalScroll.Maximum)
                        currentButton.Left = this.Containe.HorizontalScroll.Maximum - currentButton.Width;
                    if (currentButton.Top + currentButton.Height > this.Containe.VerticalScroll.Maximum)
                        currentButton.Top = this.Containe.VerticalScroll.Maximum - currentButton.Height;
                    
                }
            }
        }

        private void DeviceMouseUp(object sender, MouseEventArgs e)
        {
            Button currentButton = (Button)sender;
            if (Containe == null)
            {
                return;
            }
            if (this.IsMoving)
            {
                pCursorOffset.X = 0;
                pCursorOffset.Y = 0;
                IsMoving = false;
            }
        }
        #endregion
        public void EditMode(Control c, ScrollableControl parentContain)
        {
            ctrl = c;
            this.Containe = parentContain;

            ctrl.MouseDown += new MouseEventHandler(DeviceMouseDown);
            ctrl.MouseMove += new MouseEventHandler(DeviceMouseMove);
            ctrl.MouseUp += new MouseEventHandler(DeviceMouseUp);
        }
        public void SaveMode(Control c, ScrollableControl parentContain)
        {
            ctrl = c;
            this.Containe = parentContain;
            ctrl.MouseDown -= new MouseEventHandler(DeviceMouseDown);
            ctrl.MouseMove -= new MouseEventHandler(DeviceMouseMove);
            ctrl.MouseUp -= new MouseEventHandler(DeviceMouseUp);
        }
        
        public void simulateDeviceMouseDown(Point lpPoint)
        {
            Win32.simulateDeviceMouseDown( lpPoint);
        }
    }