XtraScrollableControl 滚动条控件随鼠标滚动

using System;
using System.Windows.Forms;
using DevExpress.XtraEditors;

namespace WindowsFormsApplication1 {
    public class ScrollHelper {

        readonly XtraScrollableControl _scrollableControl;

        public ScrollHelperXtraScrollableControl scrollableControl) { _scrollableControl = scrollableControl; }

        public void EnableScrollOnMouseWheel) { _scrollableControl.VisibleChanged += OnVisibleChanged; }

        void OnVisibleChangedobject sender, EventArgs e) {
            _scrollableControl.Select);
            UnsubscribeFromMouseWheel_scrollableControl.Controls);
            SubscribeToMouseWheel_scrollableControl.Controls);
        }

        public void SubscribeToMouseWheelControl.ControlCollection controls) {
            foreach Control ctrl in controls) {
                ctrl.MouseWheel += OnMouseWheel;
                SubscribeToMouseWheelctrl.Controls);
            }
        }

        public void UnsubscribeFromMouseWheelControl.ControlCollection controls)
        {
            foreach Control ctrl in controls) {
                ctrl.MouseWheel -= OnMouseWheel;
                UnsubscribeFromMouseWheelctrl.Controls);
            }
        }

        void OnMouseWheelobject sender, MouseEventArgs e) {
            DevExpress.Utils.DXMouseEventArgs.GetMouseArgse).Handled = true;
            var scrollValue = _scrollableControl.VerticalScroll.Value;
            var largeChange = _scrollableControl.VerticalScroll.LargeChange;
            if e.Delta < 0)
                _scrollableControl.VerticalScroll.Value += _scrollableControl.VerticalScroll.LargeChange;
            else
                if scrollValue < largeChange) { _scrollableControl.VerticalScroll.Value = 0; }
                else { _scrollableControl.VerticalScroll.Value -= largeChange; }
        }

        public void DisableScrollOnMouseWheel) {
            _scrollableControl.VisibleChanged -= OnVisibleChanged;
            UnsubscribeFromMouseWheel_scrollableControl.Controls);
        }

    }
}

调用方法：

        private ScrollHelper _scrollHelper;

        public 构造函数)
        {
            InitializeComponent);

            _scrollHelper = new ScrollHelperxtraScrollableControl1);
            _scrollHelper.EnableScrollOnMouseWheel);
        }