[DEVEXPRESS/WINFORM] XtraScrollableControl 클래스 : 마우스 휠 이벤트 사용하기

▶ 예제

using DevExpress.XtraEditors;

...

/// <summary>
/// 스크롤 가능 컨트롤
/// </summary>
private XtraScrollableControl scrollableControl;

...

/// <summary>
/// 스크롤 헬퍼
/// </summary>
private ScrollHelper scrollHelper = null;

...


this.scrollHelper = new ScrollHelper(this.scrollableControl);

this.scrollHelper.EnableScrollOnMouseWheel();

...

if(this.scrollHelper != null)
{
    this.scrollHelper.DisableScrollOnMouseWheel();
}

 

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▶ ScrollHelper.cs

using System;
using System.Windows.Forms;

using DevExpress.Utils;
using DevExpress.XtraEditors;

namespace DSCORE.WINFORM.UI.CONTROL.DEVEXPRESS
{
    /// <summary>
    /// 스크롤 헬퍼
    /// </summary>
    /// <remarks>XtraScrollableControl의 마우스 휠 기능을 제공한다.</remarks>
    public class ScrollHelper
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Field
        ////////////////////////////////////////////////////////////////////////////////////////// Private

        #region Field

        /// <summary>
        /// 소스 컨트롤
        /// </summary>
        private XtraScrollableControl sourceControl;

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 생성자 - ScrollHelper(sourceControl) 

        /// <summary>
        /// 생성자
        /// </summary>
        /// <param name="sourceControl">소스 컨트롤</param>
        public ScrollHelper(XtraScrollableControl sourceControl)  
        {  
            this.sourceControl = sourceControl;  
        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 마우스 WHEEL 스크롤 활성화 하기 - EnableScrollOnMouseWheel()

        /// <summary>
        /// 마우스 WHEEL 스크롤 활성화 하기
        /// </summary>
        public void EnableScrollOnMouseWheel()
        {  
            sourceControl.VisibleChanged += sourceControl_VisibleChanged;  
        }

        #endregion
        #region 마우스 WHEEL 스크롤 비활성화 하기 - DisableScrollOnMouseWheel()

        /// <summary>
        /// 마우스 WHEEL 스크롤 비활성화 하기
        /// </summary>
        public void DisableScrollOnMouseWheel()
        {  
            sourceControl.VisibleChanged -= sourceControl_VisibleChanged;  

            UnsubscribeFromMouseWheel(sourceControl.Controls);  

            sourceControl = null;  
        }

        #endregion

        ////////////////////////////////////////////////////////////////////////////////////////// Private
        //////////////////////////////////////////////////////////////////////////////// Event

        #region 소스 컨트롤 표시 여부 변경시 처리하기 - sourceControl_VisibleChanged(sender, e)

        /// <summary>
        /// 소스 컨트롤 표시 여부 변경시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void sourceControl_VisibleChanged(object sender, EventArgs e)
        {  
            sourceControl.Select();

            UnsubscribeFromMouseWheel(sourceControl.Controls);  

            SubscribeToMouseWheel(sourceControl.Controls);  
        }

        #endregion
        #region 컨트롤 마우스 WHEEL 처리하기 - control_MouseWheel(sender, e)  

        /// <summary>
        /// 컨트롤 마우스 WHEEL 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void control_MouseWheel(object sender, MouseEventArgs e)  
        {  
            DXMouseEventArgs.GetMouseArgs(e).Handled = true;

            int scrollValue = sourceControl.VerticalScroll.Value;
            int largeChange = sourceControl.VerticalScroll.LargeChange;

            if(e.Delta < 0)
            {
                sourceControl.VerticalScroll.Value += sourceControl.VerticalScroll.LargeChange;
            }
            else
            {
                if(scrollValue < largeChange)
                {
                    sourceControl.VerticalScroll.Value = 0;
                }
                else
                {
                    sourceControl.VerticalScroll.Value -= largeChange;
                }
            }
        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////// Function

        #region 마우스 WHEEL 구독하기 - SubscribeToMouseWheel(controlCollection)  

        /// <summary>
        /// 마우스 WHEEL 구독하기
        /// </summary>
        /// <param name="controlCollection">컨트롤 컬렉션</param>
        private void SubscribeToMouseWheel(Control.ControlCollection controlCollection)
        {  
            foreach(Control control in controlCollection)  
            {  
                control.MouseWheel += control_MouseWheel;

                SubscribeToMouseWheel(control.Controls);
            }  
        }

        #endregion
        #region 마우스 WHEEL 구독 취소하기 - UnsubscribeFromMouseWheel(controlCollection)

        /// <summary>
        /// 마우스 WHEEL 구독 취소하기
        /// </summary>
        /// <param name="controlCollection">컨트롤 컬렉션</param>
        private void UnsubscribeFromMouseWheel(Control.ControlCollection controlCollection)
        {  
            foreach(Control control in controlCollection)
            {  
                control.MouseWheel -= control_MouseWheel;

                UnsubscribeFromMouseWheel(control.Controls);
            }
        }

        #endregion
    }
}