vb.net 在 tabcontrol MouseClick 事件上单击了哪个选项卡
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Which tab was clicked on tabcontrol MouseClick event
提问by Jimmie Lin
I am learning how to develop Windows Forms applications with Visual Basic Express 2008, and my testing/learning application has a TabControl with a few test pages (3, for example, the number isn't relevant here).
我正在学习如何使用 Visual Basic Express 2008 开发 Windows 窗体应用程序，我的测试/学习应用程序有一个 TabControl 和几个测试页面（例如，3 个，这里的数字不相关）。
Now, I am handing the MouseClick event on the Tabcontrol, and I can't seem to be able to figure out how to get which tab was clicked on. I believe that the MouseClick event isn't fired if I click on another place of the tab strip, therefore a tab must have been clicked on. The problem is, which was the tab?
现在，我在 Tabcontrol 上处理 MouseClick 事件，但我似乎无法弄清楚如何获取点击了哪个选项卡。我相信如果我单击选项卡条的另一个位置，则不会触发 MouseClick 事件，因此必须单击了一个选项卡。问题是，哪个是标签？
Any help would be appreciated. Thanks!
任何帮助，将不胜感激。谢谢！
回答by stakx - no longer contributing
Don't use the MouseClickevent, because there is another event better suited for this purpose:
(Note: edited after the OP has posted a comment.)
不要使用该MouseClick事件，因为还有另一个更适合此目的的事件：（
注意：在 OP 发表评论后编辑。）
TabControlhas a property SelectedIndex. This is the zero-based number of the currently selected tab. (There is also another property called SelectedTab, referring directly to the selected tab page object.)
TabControl有一个属性SelectedIndex。这是当前选定选项卡的从零开始的数字。（还有另一个名为 的属性SelectedTab，直接引用选定的标签页对象。）
You can hook an event handler to the event SelectedIndexChangedin order to be notified whenever the user selects another tab:
您可以将事件处理程序挂钩到该事件SelectedIndexChanged，以便在用户选择另一个选项卡时收到通知：
Private Sub MyTabControl_SelectedIndexChanged(ByVal sender As Object, _
ByVal e As System.EventArgs) _
Handles MyTabControl.SelectedIndexChanged
Dim indexOfSelectedTab As Integer = MyTabControl.SelectedIndex
Dim selectedTab As System.Windows.Forms.TabPage = MyTabControl.SelectedTab
...
End Sub
(Take note that you mightwant to additionally guard your code against cases where SelectedIndexhas an invalid value, e.g. -1.)
（请注意，您可能需要额外保护您的代码，以防SelectedIndex出现无效值的情况，例如-1。）
Edit (added after comment of OP):
编辑（在 OP 评论后添加）：
If SelectedIndexChangeddoes not work for you because you need to catch the user's action for all mouse buttons, you could use the GetTabRectmethodof TabControllike this:
如果SelectedIndexChanged因为你需要捕捉用户的动作对所有的鼠标按键不适合你，你可以使用该GetTabRect方法的TabControl是这样的：
Private Sub MyTabControl_MouseClick(sender As Object, _
e As System.Windows.Forms.MouseEventArgs) _
Handles MyTabControl.MouseClick
...
For tabIndex As Integer = 0 To MyTabControl.TabCount - 1
If MyTabControl.GetTabRect(tabIndex).Contains(e.Location) Then
... ' clicked on tab with index tabIndex '
End If
Next
...
End Sub
回答by Thurman Jenner
The simplest way I use to handle this would be to use the ENTER and LEAVE events for each tabpage's event. For Example I have it so that when I leave the first page it changes the visible property to my datagridview to False and when I enter it turns it back to True and loads the data for my table.
我用来处理这个问题的最简单的方法是为每个标签页的事件使用 ENTER 和 LEAVE 事件。例如，我有它，所以当我离开第一页时，它将我的 datagridview 的可见属性更改为 False，当我输入它时，它将它返回到 True 并为我的表加载数据。
Private Sub TabPage1_Enter(sender As System.Object, e As System.EventArgs) Handles TabPage1.Enter
DataGridView1.Visible = True
Load_Table()
End Sub
Private Sub TabPage1_Leave(sender As System.Object, e As System.EventArgs) Handles TabPage1.Leave
DataGridView1.Visible = False
End Sub
If you wanted to change the text on the control or something like that I suppose the index method would be the choice way to go, but just to know which tab was clicked that is what these two events are for.
如果您想更改控件上的文本或类似的内容，我想 index 方法将是首选方法，但只是想知道单击了哪个选项卡，这就是这两个事件的用途。
