[DevExpress] XtraScrollableControl 에서 컨트롤 삽입 후에도 휠로 스크롤 가능하게 하기

DevExpress 의 PanelControl 에서 스크롤 속성이 없다.

그래서 XtraScrollableControl 컨트롤을 사용하는데

여기에 다른 컨트롤을 갖다 놓으면 스크롤을 휠로 제어할수 없게된다ㅜㅠ

 

이를 위해선 아래 처럼 ScrollHelper 를 선언한후

XtraScrollableControl 컨트롤이 들어간 화면 초입에 아래처럼 코딩하면

문제없이 휠로도 스크롤이 가능해진다.

 

ScrollHelper scrollHelper = new ScrollHelper();

scrollHelper.EnableScrollOnMouseWheel();

 

또한 화면이 Dispose() 이벤트에서 아래처럼

기능을 꺼야한다.

scrollHelper.DisableScrollOnMouseWheel();

 

 

public class ScrollHelper     {         XtraScrollableControl scrollableControl;           public ScrollHelper(XtraScrollableControl scrollableControl)         {             this.scrollableControl = scrollableControl;         }           public void EnableScrollOnMouseWheel()         {             scrollableControl.VisibleChanged += OnVisibleChanged;         }           void OnVisibleChanged(object sender, EventArgs e)         {             scrollableControl.Select();             UnsubscribeFromMouseWheel(scrollableControl.Controls);             SubscribeToMouseWheel(scrollableControl.Controls);         }           private void SubscribeToMouseWheel(Control.ControlCollection controls)         {             foreach (Control ctrl in controls)             {                 ctrl.MouseWheel += OnMouseWheel;                 SubscribeToMouseWheel(ctrl.Controls);             }         }           private void UnsubscribeFromMouseWheel(Control.ControlCollection controls)         {             foreach (Control ctrl in controls)             {                 ctrl.MouseWheel -= OnMouseWheel;                 UnsubscribeFromMouseWheel(ctrl.Controls);             }         }           void OnMouseWheel(object sender, MouseEventArgs e)         {             DevExpress.Utils.DXMouseEventArgs.GetMouseArgs(e).Handled = true;             int scrollValue = scrollableControl.VerticalScroll.Value;             int 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);             scrollableControl = null;         }     }

 

 

참고

https://www.devexpress.com/Support/Center/Question/Details/K18512/how-to-enable-scrolling-in-xtrascrollablecontrol-by-using-the-mouse-wheel