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.NET (Core and Framework)

[VB.NET 2008] How to detect if a page of a TabControl is selected (Windows CE)

steve_94966136-Dec-12 21:37

6-Dec-12 21:37

Hi,
I'm developing an application that runs in a Windows CE 5.0 environment and I'm using VB.NET in Visual Studio 2008 Pro.
In a Form I have a TabControl with some pages.
My problem is to understand when a page of the TabControl is selected to perform some actions in that page automatically.
In the Compact Framework there isn't the event Control.Enter so I can't use it, that would be the right one...

Does anyone have any idea?

Thanks

Re: [VB.NET 2008] How to detect if a page of a TabControl is selected (Windows CE)

Zaf Khan10-Dec-12 17:57

Zaf Khan

10-Dec-12 17:57

Taking a look at the documentation....
Documentation
Shows us that the Tab Control notifies the PARENT object using WM_Notify messaging.

So you need to look into WM_Notfication messages.
A little more can be found here
Look under Notification section

Re: [VB.NET 2008] How to detect if a page of a TabControl is selected (Windows CE)

steve_949661311-Dec-12 21:20

steve_9496613

11-Dec-12 21:20

Thank you Zaf.
You gave me some useful information.
I honestly do not know well how to use the WM_NOTIFY messages but looking on google I found various information about it, maybe something like this:

Const WM_MESSAGE_TO_MANAGE As Integer = ... 'integer value of the message

Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
    If m.Msg = WM_MESSAGE_TO_MANAGE Then
        'things to do
    End If
    MyBase.WndProc(m)
End Sub

In the specific situation I solved my problem in an alternative way (I don't use more different pages of the TabControl but on a single page I add N UserControl and step from one to another with buttons and I use the Click event to do what it takes) but surely this method can be useful to me on other occasions so I will look into the subject.

Thank you very much.

Re: [VB.NET 2008] How to detect if a page of a TabControl is selected (Windows CE)

Zaf Khan12-Dec-12 2:13

Zaf Khan

12-Dec-12 2:13

Hello Steve,

I came across the WM_NOTIFY message and (inter?) windows messaging in the REBAR control (ribbon/taskbar) manipulation code sample on the microsoft website which also provided me with a sample implementation that i found understandable, during the time when i was learning microsoft VB5 CCE.

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