父控件鼠标输入/离开带有子控件的事件

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+---------------------------------+ 
| [Label Control]  [Edit Control] |
+---------------------------------+

Parent.OnMouseEnter      (start doing something)
Parent.OnMouseLeave      (stop)
Child.OnMouseEnter       (start doing something)
Child.OnMouseLeave       (stop)
Parent.OnMouseEnter      (start doing something)
Parent.OnMouseLeave      (stop)

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);
}

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;
}

public class TranspCtrl : Control
    public TranspCtrl()
        SetStyle(ControlStyles.SupportsTransparentBackColor, true);
        SetStyle(ControlStyles.Opaque, true);
        this.BackColor = Color.Transparent;
    protected override CreateParams CreateParams
            CreateParams cp = base.CreateParams;
            cp.ExStyle = cp.ExStyle | 0x20;
            return cp;
}

public class ChangeBackgroundOnMouseEnterAndLeave
    public Panel Container;
    public Label FirstLabel;
    public Label SecondLabel;
    public ChangeBackgroundOnMouseEnterAndLeave()
        Container = new Panel();
        Container.Size = new Size(200, 60);
        FirstLabel = new Label();
        FirstLabel.Text = "First Label";
        FirstLabel.Top = 5;
        SecondLabel = new Label();
        SecondLabel.Text = "Second Lable";
        SecondLabel.Top = 30;
        FirstLabel.Parent = Container;
        SecondLabel.Parent = Container;
        Container.BackColor = Color.Teal;
        var transparentControl = new TranspCtrl();
        transparentControl.Size = Container.Size;
        transparentControl.MouseEnter += MouseEntered;
        transparentControl.MouseLeave += MouseLeft;
        transparentControl.Parent = Container;
        transparentControl.BringToFront();
    void MouseLeft(object sender, EventArgs e)
        Container.BackColor = Color.Teal;
    void MouseEntered(object sender, EventArgs e)
        Container.BackColor = Color.Pink;
public partial class Form1 : Form
    public Form1()
        InitializeComponent();

父控件鼠标输入/离开带有子控件的事件

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