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Set Class Property

Posted on 2013-12-30
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Last Modified: 2013-12-31
I am trying to program a calendar and have created a class for the day buttons which captures the Click event for any of them. For the purpose of handling this event on class level I would like to create a Parent property for the buttons and assign the UserForm to it. This is the code I have,
in the class module 'CalButton'
    Public WithEvents CalBtn As MSForms.Label
    Public pParent As DatePicker

    Public Property Get Parent() As DatePicker
        Set CalForm = pParent
    End Property
    Public Property Set CalForm(CalForm As DatePicker)
        Set pParent = CalForm
    End Property

Private Sub CalBtn_Click()
    MsgBox CalBtn.Name & " was clicked."
    Debug.Print CalBtn.Parent.Name                  ' DOESN'T WORK
End Sub

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in the code module of the UserForm (DatePicker - no relation of the Excel form by the same name)
    Dim Btn() As CalButton

Private Sub AssignCalButtons()
    ' assign all day button to CalButton class

    Dim Ctl As Object
    Dim i As Long

    ReDim Btn(1 To Me.Controls.Count)
    For Each Ctl In Me.Controls
        If InStr(1, Ctl.Name, "Day", vbTextCompare) = 1 Then
            i = i + 1
            Set Btn(i) = New CalButton
            Set Btn(i).CalBtn = Ctl
            Set Btn(i).Parent = Me                      ' Compile error: Invalid use of property 
        End If
    Next Ctl
    ReDim Preserve Btn(1 To i)
End Sub

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The code runs and works without the Parent property idea. What am I doing wrong, and how to do it right?
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Question by:Faustulus
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7 Comments
 
LVL 43

Assisted Solution

by:pcelba
pcelba earned 2000 total points
ID: 39747777
Parent is built-in property which is read/only and always assigned by the object itself. It contains a reference to the parent container object.

If you really need to store the Form reference somewhere then create a new property for this purpose.

Update: If you would create your "buttons" as showed e.g. here: http://www.vbaexpress.com/forum/archive/index.php/t-31316.html   then the Parent property should contain the correct value without any assignment.
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LVL 14

Author Comment

by:Faustulus
ID: 39747975
Yes. You are right. The Parent property is available in the code I have as well. I had tested that first and it failed for reasons I now can't find out. That's why I tried to assign the form as a property to the class. That failed, too. That is why I tried to assign it to the Parent property.
OK. The problem is solved. But can you tell me how I can assign the form as a property of the class?
I have been testing this:
In the class module,
    Public pCalForm As MSForms.UserForm
    
    Public Property Get CalForm() As MSForms.UserForm
        Set CalForm = pCalForm
    End Property
    Public Property Set CalForm(Cal As MSForms.UserForm)
        Set pCalForm = Cal
    End Property

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And in the code (actually, the form's code module)
    Set CalButton.CalForm = Me

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It stops at CalButton and claims "Variable no defined".
Happy New Year!
Faustulus
0
 
LVL 43

Expert Comment

by:pcelba
ID: 39748042
This could mean either CalButton or CalForm is undefined.
0
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LVL 14

Author Comment

by:Faustulus
ID: 39748286
CalButton is the name of the class module.
CalForm is defined in the code I posted which is in the class module CalButton.
Where is the mistake?
0
 
LVL 43

Accepted Solution

by:
pcelba earned 2000 total points
ID: 39748366
The class definition does not create any variables. You must use some existing instance of the CalButton.

If you have button instances in Btn array:

Dim Btn() As CalButton
Set i = 1
Set Btn(i) = New CalButton   ' Now the Btn(1)  contains reference to the CalButton class instance

then you may write:

 Set Btn(i).CalForm = Me
0
 
LVL 14

Author Closing Comment

by:Faustulus
ID: 39748560
Thank you. Your support was was a great relief to me in my hours of trial (and error).
0
 
LVL 43

Expert Comment

by:pcelba
ID: 39748967
You are welcome!  

BTW, I don't use VB.NET at all. It seems I should install VS finally.

Happy New Year!
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