禁用标签上的鼠标事件(启用时)

Question

我有一个由面板，图片框和标签组成的“按钮”。

我已经禁用了图片框和标签，以保持MouseEnter (和背景色)活动。然而，禁用的标签具有通常的褪色文本-有没有办法使标签保持启用状态，但忽略鼠标事件，就像禁用时一样？

Private Sub panelBackup_MouseEnter(sender As Object, e As EventArgs) Handles panelBackupButton.MouseEnter
    Dim btn As Panel = DirectCast(sender, Panel)
    btn.BackColor = Color.Gray
End Sub

Private Sub panelBackup_MouseLeave(sender As Object, e As EventArgs) Handles panelBackupButton.MouseLeave
    Dim btn As Panel = DirectCast(sender, Panel)
    btn.BackColor = Color.LightGray
End Sub

Answer 1

也为标签设置相同的事件

Private Sub panelBackup_MouseEnter(sender As Object, e As EventArgs) 
                   Handles panelBackupButton.MouseEnter, Label1.MouseEnter 
    Dim btn As Panel = TryCast(sender, Panel) 
    if Not btn Is Nothing then 
        btn.BackColor = Color.Gray 
    else 
        Dim lbl As Label = TryCast(sender, Label)
        lbl.BackColor = Color.Gray 
    end if
End Sub

Private Sub panelBackup_MouseLeave(sender As Object, e As EventArgs) 
                   Handles panelBackupButton.MouseLeave, Label1.MouseLeave 
    Dim btn As Panel = TryCast(sender, Panel) 
    if Not btn Is Nothing then 
        btn.BackColor = Color.LightGray 
    else 
        Dim lbl As Label = TryCast(sender, Label)
        lbl.BackColor = Color.LightGray 
    end if
End Sub 

另外，我删除了DirectCast，因为您可以直接使用panelBackup.BackColor属性(否则，您需要添加不必要的额外逻辑来区分由面板或标签触发的事件。

编辑:看到您的评论，我更改了重新引入强制转换的方法，但在标签引发事件时使用TryCast来避免异常。我应该提到的是，可能可以TryCast到泛型控件，而不是特定的面板或标签，因为BackColor是从基类(控件)继承的属性