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 ScrollHelper(XtraScrollableControl scrollableControl) { _scrollableControl = scrollableControl; } public void EnableScrollOnMouseWheel() { _scrollableControl.VisibleChanged += OnVisibleChanged; } void OnVisibleChanged(object sender, EventArgs e) { _scrollableControl.Select(); UnsubscribeFromMouseWheel(_scrollableControl.Controls); SubscribeToMouseWheel(_scrollableControl.Controls); } public void SubscribeToMouseWheel(Control.ControlCollection controls) { foreach (Control ctrl in controls) { ctrl.MouseWheel += OnMouseWheel; SubscribeToMouseWheel(ctrl.Controls); } } public 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; 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 ScrollHelper(xtraScrollableControl1); _scrollHelper.EnableScrollOnMouseWheel(); }
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