Check3state: how to check gray?

[Egbert Zijlema]

Hi folks,
This is what I've copied from the on-line PBDLL60 helpfile in connection with CONTROL GET CHECK.
"Purpose: Get the check status of a CHECKBOX, CHECK3STATE or OPTION button.
"Syntax: CONTROL GET CHECK hDlg&, Id& TO result&
"Remarks: - .... - Zero (0) is returned if the button is unchecked. One (1) is returned if the button is checked.
"Two (2) is returned if a 3STATE button is grayed. - end quote.

Well, one of my dialogs contains grayed CHECK3STATE boxes (used CONTROL DISABLE to achieve that),
but CONTROL GET CHECK does return zero or one; never a '2'. Is this a known bug in DDT?
And if so, how to work around it?

Thanks,



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[Kev Peel]

Hi Egbert,

Although I don't do DDT, have you tried the %BM_GETCHECK message as a workaround?

iState = SendMessage(hBtn, %BM_GETCHECK, 0, 0)
If iState = %BST_INDETERMINATE Then [etc. etc.]

Regards,


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Kev G Peel
KGP Software, Bridgwater, UK.
www.go.to/kgpsoftware

[Semen Matusovski]

Egbert --
You mix disabled control with "grayed".
Grayed means "indeterminate". Meanwhile control remains enabled.

To set "gray" state you should send a message
Control Send CbHndl, id, %BM_SETCHECK, %BST_INDETERMINATE, 0
instead of disabling.

Small illustration:

   #Dim All
   #Register None
   #Include "Win32Api.Inc"
   CallBack Function DlgProc
      Select Case CbMsg
         Case %WM_INITDIALOG
            Control Add Check3State, CbHndl, 101, "Disabled", 10, 5, 80, 15
            Control Add Check3State, CbHndl, 102, "Grayed", 10, 20, 80, 15
            Control Add Check3State, CbHndl, 103, "Checked", 10, 35, 80, 15
            Control Add Check3State, CbHndl, 104, "Unchecked", 10, 50, 80, 15
            Control Disable CbHndl, 101
            Control Send CbHndl, 102, %BM_SETCHECK, %BST_INDETERMINATE, 0
            Control Set Check CbHndl, 103, %BST_CHECKED
      End Select
   End Function

   Function PbMain
      Local hDlg As Long
      Dialog New 0 ,"Test",,, 100, 70, %WS_SYSMENU Or %WS_CAPTION Or %WS_MINIMIZEBOX To hDlg
      Dialog Show Modal hDlg, Call DlgProc
   End Function

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[This message has been edited by Semen Matusovski (edited October 11, 2000).]

[Tom Hanlin]

It's not a bug in DDT or anything else. A Check3State box may have any of three values: true, false, or indeterminate. These values have nothing to do with whether the box is enabled or disabled, which is an entirely different property of the control.


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Tom Hanlin
PowerBASIC Staff

[Egbert Zijlema]

Thank you, boys!

I did not know the difference between 'grayed' and 'disabled'.
Sorry, Tom, but due to this lack of knowledge I really thought it was a bug.
It is great to experience, by the way, that Power Basic staff members do participate in these discussions.
Two months ago (approx.) I published my article discussing the version info stuff. In my opinion the article
delivers watertight evidence that Microsoft programmers don't follow their own rules in this field. Microsoft
staff members must have read (or at least: seen) it, but I did not get any comment.





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