问题:
发布时间:2020-03-10
(单项选择题)单项选择题:窗体弹出式菜单的事件响应
在Visual Basic中,如果已经通过菜单编辑器为窗体创建了一个弹出式菜单,其顶级菜单名称为a1,且其“可见”属性设置为False。请问,哪个事件过程能够同时响应鼠标左键单击和右键单击,并显示该弹出式菜单?
- A.Private Sub Form_ MouseDown (Button As Integer, _ Shift As Integer, X As Single, Y As Single) If Button = 1 And Button = 2 Then PopupMenu a1 End If End Sub
- B.Private Sub Form_ MouseDown (Button As Integer, _ Shift As Integer, X As Single, Y As Single) PopupMenu a1 End Sub
- C.Private Sub Form_ MouseDown (Button As Integer, _ Shift As Integer, X As Single, Y As Single) If Button = 1 Then PopupMenu a1 End If End Sub
- D.Private Sub Form_ MouseDown (Button As Integer, _ Shift As Integer, X As Single, Y As Single) If Button = 2 Then PopupMenu a1 End If End Sub
提问:
在Visual Basic中,如何编写事件过程以实现窗体弹出式菜单同时响应鼠标左键和右键单击?请解释每个选项的功能和适用场景。
复习要点:
理解Visual Basic中的鼠标事件处理,特别是MouseDown事件,以及如何使用PopupMenu方法来显示弹出式菜单。
查阅资料方向:
查阅Visual Basic中关于鼠标事件和菜单操作的详细资料,特别是MouseDown事件和PopupMenu方法的使用。
参考答案: