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Custom Controls using a generic interface

Posted on 2002-04-03
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Last Modified: 2010-05-02

I have built several custom controls and have recently had a need to access them in a polymorphic or generic fashion. I would like to known if it is possible to use the implements key word inside of a custom control using a generic interface. I have tried to do this with no success. The problem happens when I try to set the custom control to the generic interface an error for type mismatch occurs.
I have used the implements in many occasions with no problem in regular classes. Maybe Custom Controls do not allow this. Please help. Thank You.
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Question by:noah_i
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ameba earned 300 total points
ID: 6916868
noah_i,
> The problem happens when I try to set the custom control to the generic interface an error for
> type mismatch occurs.

That should work.
Where is your interface class defined?  Make sure it is defined only once and that all your User Controls are using it.

How to use secondary interface methods/properties:

- you cannot access it directly, e.g. if Clear is in IDataEntry interface, you cannot use:
     myBetterTextBox1.Clear

You must define separate variable of the right type:
     Dim de As IDataEntry
     Set de = myBetterTextBox1    ' access user control using IDataEntry interface (=casting)
     de.Clear

The other method is to pass user control to a function:

     Clear myBetterTextBox1

' in bas module
Public Sub Clear(de As IDataEntry)
     de.Clear
End Sub

See also: "How do I use the Implements keyword"
http://www.insteptech.com/techlibrary/vboo.htm#Obj_Implements
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by:noah_i
ID: 7478976
Sorry took so long. Thanks for the info.
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by:ameba
ID: 7479177
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