遇到同样的问题,我最终实现了 @Paul_Westcott 和 @nr1 的混合解决方案。这是一个本地解决方案,类似于@Paul_Westcott的解决方案(仅适用于订阅的winforms控件)。它是多显示器安全和 MDI 安全的(与应用程序内的其他窗口重叠)
public static class MouseWheelHandlerForWinformsControl
{
private class MouseWheelMessageFilter : IMessageFilter
{
[DllImport("user32.dll")]
private static extern IntPtr WindowFromPoint(Point pt);
private readonly Control mCtrl;
private readonly Action<MouseEventArgs> mOnMouseWheel;
public MouseWheelMessageFilter(Control ctrl, Action<MouseEventArgs> onMouseWheel)
{
mCtrl = ctrl;
mOnMouseWheel = onMouseWheel;
}
public bool PreFilterMessage(ref Message m)
{
// handle only mouse wheel messages
if (m.Msg != 0x20a)
return false;
Point mouseAbsolutePosition = new Point(m.LParam.ToInt32());
Point mouseRelativePosition = mCtrl.PointToClient(mouseAbsolutePosition);
IntPtr hControlUnderMouse = WindowFromPoint(mouseAbsolutePosition);
Control controlUnderMouse = Control.FromHandle(hControlUnderMouse);
if (controlUnderMouse != mCtrl)
return false;
MouseButtons buttons = GetMouseButtons(m.WParam.ToInt32());
int delta = m.WParam.ToInt32() >> 16;
var e = new MouseEventArgs(buttons, 0, mouseRelativePosition.X, mouseRelativePosition.Y, delta);
mOnMouseWheel(e);
return true;
}
private static MouseButtons GetMouseButtons(int wParam)
{
MouseButtons buttons = MouseButtons.None;
if(HasFlag(wParam, 0x0001)) buttons |= MouseButtons.Left;
if(HasFlag(wParam, 0x0010)) buttons |= MouseButtons.Middle;
if(HasFlag(wParam, 0x0002)) buttons |= MouseButtons.Right;
if(HasFlag(wParam, 0x0020)) buttons |= MouseButtons.XButton1;
if(HasFlag(wParam, 0x0040)) buttons |= MouseButtons.XButton2;
return buttons;
}
private static bool HasFlag(int input, int flag)
{
return (input & flag) == flag;
}
}
public static void MemorySafeAdd(Control ctrl, Action<MouseEventArgs> onMouseWheel)
{
if (ctrl == null || onMouseWheel == null)
throw new ArgumentNullException();
var filter = new MouseWheelMessageFilter(ctrl, onMouseWheel);
Application.AddMessageFilter(filter);
ctrl.Disposed += (s, e) => Application.RemoveMessageFilter(filter);
}
}
一旦您将此帮助程序类添加到您的解决方案中,您就可以订阅一个控件myControl
到鼠标滚轮,一行,如下:
public void Init() {
MouseWheelHandlerForWinformsControl.MemorySafeAdd(myControl, OnMouseWheelEvent);
}
void OnMouseWheelEvent(MouseEventArgs args) {
// do what you need here
}