我有一个C#.NET 2.0 WinForms应用程序。我的应用程序有一个控件,它是两个子控件的容器:一个标签和某种编辑控件。可以这样想,其中外部框是父控件:
+---------------------------------+
| [Label Control] [Edit Control] |
+---------------------------------+
当鼠标进入或离开父控件时,我试图做一些事情,但我不在乎鼠标是否移动到它的一个子控件中。我想要一个单独的标志来表示“鼠标在父或子控件的某个位置”和“鼠标已经移出父控件边界”。
我尝试过在父控件和两个子控件上处理MouseEnter和MouseLeave,但这意味着当鼠标在控件上移动时,操作会开始和结束多次。换句话说,我明白了:
Parent.OnMouseEnter (start doing something)
Parent.OnMouseLeave (stop)
Child.OnMouseEnter (start doing something)
Child.OnMouseLeave (stop)
Parent.OnMouseEnter (start doing something)
Parent.OnMouseLeave (stop)
中间的OnMouseLeave事件会导致一些不希望的效果,因为我正在做的事情开始后停止。。
发布于 2018-03-22 10:43:56
经过更多的研究,使用此方法,我创建了鼠标钩子的.NET版本:
class MouseMessageFilter : IMessageFilter, IDisposable
{
public MouseMessageFilter()
{
}
public void Dispose()
{
StopFiltering();
}
#region IMessageFilter Members
public bool PreFilterMessage(ref Message m)
{
// Call the appropriate event
return false;
}
#endregion
#region Events
public class CancelMouseEventArgs : MouseEventArgs
{...}
public delegate void CancelMouseEventHandler(object source, CancelMouseEventArgs e);
public event CancelMouseEventHandler MouseMove;
public event CancelMouseEventHandler MouseDown;
public event CancelMouseEventHandler MouseUp;
public void StartFiltering()
{
StopFiltering();
Application.AddMessageFilter(this);
}
public void StopFiltering()
{
Application.RemoveMessageFilter(this);
}
}
然后,我可以在我的容器控件中处理MouseMove事件,检查鼠标是否在我的父控件中,并开始工作。
在我的表单类中,我创建并连接了过滤器:
public class MyForm : Form
{
MouseMessageFilter msgFilter;
public MyForm()
{...
msgFilter = new MouseMessageFilter();
msgFilter.MouseDown += new MouseMessageFilter.CancelMouseEventHandler(msgFilter_MouseDown);
msgFilter.MouseMove += new MouseMessageFilter.CancelMouseEventHandler(msgFilter_MouseMove);
}
private void msgFilter_MouseMove(object source, MouseMessageFilter.CancelMouseEventArgs e)
{
if (CheckSomething(e.Control)
e.Cancel = true;
}
}
https://stackoverflow.com/questions/-100007723
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